///////////////////////////////////////////////////////////////////////// // $Id$ ///////////////////////////////////////////////////////////////////////// // // Copyright (C) 2002 MandrakeSoft S.A. // // MandrakeSoft S.A. // 43, rue d'Aboukir // 75002 Paris - France // http://www.linux-mandrake.com/ // http://www.mandrakesoft.com/ // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Lesser General Public // License as published by the Free Software Foundation; either // version 2 of the License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA // ROM BIOS for use with Bochs/Plex86/QEMU emulation environment // ROM BIOS compatibility entry points: // =================================== // $e05b ; POST Entry Point // $e2c3 ; NMI Handler Entry Point // $e3fe ; INT 13h Fixed Disk Services Entry Point // $e401 ; Fixed Disk Parameter Table // $e6f2 ; INT 19h Boot Load Service Entry Point // $e6f5 ; Configuration Data Table // $e729 ; Baud Rate Generator Table // $e739 ; INT 14h Serial Communications Service Entry Point // $e82e ; INT 16h Keyboard Service Entry Point // $e987 ; INT 09h Keyboard Service Entry Point // $ec59 ; INT 13h Diskette Service Entry Point // $ef57 ; INT 0Eh Diskette Hardware ISR Entry Point // $efc7 ; Diskette Controller Parameter Table // $efd2 ; INT 17h Printer Service Entry Point // $f045 ; INT 10 Functions 0-Fh Entry Point // $f065 ; INT 10h Video Support Service Entry Point // $f0a4 ; MDA/CGA Video Parameter Table (INT 1Dh) // $f841 ; INT 12h Memory Size Service Entry Point // $f84d ; INT 11h Equipment List Service Entry Point // $f859 ; INT 15h System Services Entry Point // $fa6e ; Character Font for 320x200 & 640x200 Graphics (lower 128 characters) // $fe6e ; INT 1Ah Time-of-day Service Entry Point // $fea5 ; INT 08h System Timer ISR Entry Point // $fef3 ; Initial Interrupt Vector Offsets Loaded by POST // $ff53 ; IRET Instruction for Dummy Interrupt Handler // $ff54 ; INT 05h Print Screen Service Entry Point // $fff0 ; Power-up Entry Point // $fff5 ; ASCII Date ROM was built - 8 characters in MM/DD/YY // $fffe ; System Model ID // NOTES for ATA/ATAPI driver (cbbochs@free.fr) // Features // - supports up to 4 ATA interfaces // - device/geometry detection // - 16bits/32bits device access // - pchs/lba access // - datain/dataout/packet command support // // NOTES for El-Torito Boot (cbbochs@free.fr) // - CD-ROM booting is only available if ATA/ATAPI Driver is available // - Current code is only able to boot mono-session cds // - Current code can not boot and emulate a hard-disk // the bios will panic otherwise // - Current code also use memory in EBDA segment. // - I used cmos byte 0x3D to store extended information on boot-device // - Code has to be modified modified to handle multiple cdrom drives // - Here are the cdrom boot failure codes: // 1 : no atapi device found // 2 : no atapi cdrom found // 3 : can not read cd - BRVD // 4 : cd is not eltorito (BRVD) // 5 : cd is not eltorito (ISO TAG) // 6 : cd is not eltorito (ELTORITO TAG) // 7 : can not read cd - boot catalog // 8 : boot catalog : bad header // 9 : boot catalog : bad platform // 10 : boot catalog : bad signature // 11 : boot catalog : bootable flag not set // 12 : can not read cd - boot image // // ATA driver // - EBDA segment. // I used memory starting at 0x121 in the segment // - the translation policy is defined in cmos regs 0x39 & 0x3a // // TODO : // // int74 // - needs to be reworked. Uses direct [bp] offsets. (?) // // int13: // - f04 (verify sectors) isn't complete (?) // - f02/03/04 should set current cyl,etc in BDA (?) // - rewrite int13_relocated & clean up int13 entry code // // NOTES: // - NMI access (bit7 of addr written to 70h) // // ATA driver // - should handle the "don't detect" bit (cmos regs 0x3b & 0x3c) // - could send the multiple-sector read/write commands // // El-Torito // - Emulate a Hard-disk (currently only diskette can be emulated) see "FIXME ElTorito Harddisk" // - Implement remaining int13_cdemu functions (as defined by El-Torito specs) // - cdrom drive is hardcoded to ide 0 device 1 in several places. see "FIXME ElTorito Hardcoded" // - int13 Fix DL when emulating a cd. In that case DL is decremented before calling real int13. // This is ok. But DL should be reincremented afterwards. // - Fix all "FIXME ElTorito Various" // - should be able to boot any cdrom instead of the first one // // BCC Bug: find a generic way to handle the bug of #asm after an "if" (fixed in 0.16.7) #include "rombios.h" // Sanity Checks #if BX_CPU<3 # error Only 386+ cpu supported #endif #if BX_USE_ATADRV && !BX_USE_EBDA # error ATA/ATAPI Driver can only be used if EBDA is available #endif #if BX_ELTORITO_BOOT && !BX_USE_ATADRV # error El-Torito Boot can only be use if ATA/ATAPI Driver is available #endif // define this if you want to make PCIBIOS working on a specific bridge only // undef enables PCIBIOS when at least one PCI device is found // i440FX is emulated by Bochs and QEMU #define PCI_FIXED_HOST_BRIDGE 0x12378086 ;; i440FX PCI bridge // #20 is dec 20 // #$20 is hex 20 = 32 // #0x20 is hex 20 = 32 // LDA #$20 // JSR $E820 // LDD .i,S // JSR $C682 // mov al, #$20 // all hex literals should be prefixed with '0x' // grep "#[0-9a-fA-F][0-9a-fA-F]" rombios.c // no mov SEG-REG, #value, must mov register into seg-reg // grep -i "mov[ ]*.s" rombios.c // This is for compiling with gcc2 and gcc3 #define ASM_START #asm #define ASM_END #endasm ASM_START .rom .org 0x0000 use16 386 MACRO HALT ;; the HALT macro is called with the line number of the HALT call. ;; The line number is then sent to the PANIC_PORT, causing Bochs/Plex ;; to print a BX_PANIC message. This will normally halt the simulation ;; with a message such as "BIOS panic at rombios.c, line 4091". ;; However, users can choose to make panics non-fatal and continue. #if BX_VIRTUAL_PORTS mov dx,#PANIC_PORT mov ax,#?1 out dx,ax #else mov dx,#0x80 mov ax,#?1 out dx,al #endif MEND MACRO JMP_AP db 0xea dw ?2 dw ?1 MEND MACRO SET_INT_VECTOR mov ax, ?3 mov ?1*4, ax mov ax, ?2 mov ?1*4+2, ax MEND ASM_END typedef unsigned char Bit8u; typedef unsigned short Bit16u; typedef unsigned short bx_bool; typedef unsigned long Bit32u; void memsetb(seg,offset,value,count); void memcpyb(dseg,doffset,sseg,soffset,count); void memcpyd(dseg,doffset,sseg,soffset,count); // memset of count bytes void memsetb(seg,offset,value,count) Bit16u seg; Bit16u offset; Bit16u value; Bit16u count; { ASM_START push bp mov bp, sp push ax push cx push es push di mov cx, 10[bp] ; count test cx, cx je memsetb_end mov ax, 4[bp] ; segment mov es, ax mov ax, 6[bp] ; offset mov di, ax mov al, 8[bp] ; value cld rep stosb memsetb_end: pop di pop es pop cx pop ax pop bp ASM_END } // memcpy of count bytes void memcpyb(dseg,doffset,sseg,soffset,count) Bit16u dseg; Bit16u doffset; Bit16u sseg; Bit16u soffset; Bit16u count; { ASM_START push bp mov bp, sp push ax push cx push es push di push ds push si mov cx, 12[bp] ; count test cx, cx je memcpyb_end mov ax, 4[bp] ; dsegment mov es, ax mov ax, 6[bp] ; doffset mov di, ax mov ax, 8[bp] ; ssegment mov ds, ax mov ax, 10[bp] ; soffset mov si, ax cld rep movsb memcpyb_end: pop si pop ds pop di pop es pop cx pop ax pop bp ASM_END } // memcpy of count dword void memcpyd(dseg,doffset,sseg,soffset,count) Bit16u dseg; Bit16u doffset; Bit16u sseg; Bit16u soffset; Bit16u count; { ASM_START push bp mov bp, sp push ax push cx push es push di push ds push si mov cx, 12[bp] ; count test cx, cx je memcpyd_end mov ax, 4[bp] ; dsegment mov es, ax mov ax, 6[bp] ; doffset mov di, ax mov ax, 8[bp] ; ssegment mov ds, ax mov ax, 10[bp] ; soffset mov si, ax cld rep movsd memcpyd_end: pop si pop ds pop di pop es pop cx pop ax pop bp ASM_END } // read_dword and write_dword functions static Bit32u read_dword(); static void write_dword(); Bit32u read_dword(seg, offset) Bit16u seg; Bit16u offset; { ASM_START push bp mov bp, sp push bx push ds mov ax, 4[bp] ; segment mov ds, ax mov bx, 6[bp] ; offset mov ax, [bx] add bx, #2 mov dx, [bx] ;; ax = return value (word) ;; dx = return value (word) pop ds pop bx pop bp ASM_END } void write_dword(seg, offset, data) Bit16u seg; Bit16u offset; Bit32u data; { ASM_START push bp mov bp, sp push ax push bx push ds mov ax, 4[bp] ; segment mov ds, ax mov bx, 6[bp] ; offset mov ax, 8[bp] ; data word mov [bx], ax ; write data word add bx, #2 mov ax, 10[bp] ; data word mov [bx], ax ; write data word pop ds pop bx pop ax pop bp ASM_END } // Bit32u (unsigned long) and long helper functions ASM_START ;; and function landl: landul: SEG SS and ax,[di] SEG SS and bx,2[di] ret ;; add function laddl: laddul: SEG SS add ax,[di] SEG SS adc bx,2[di] ret ;; cmp function lcmpl: lcmpul: and eax, #0x0000FFFF shl ebx, #16 or eax, ebx shr ebx, #16 SEG SS cmp eax, dword ptr [di] ret ;; sub function lsubl: lsubul: SEG SS sub ax,[di] SEG SS sbb bx,2[di] ret ;; mul function lmull: lmulul: and eax, #0x0000FFFF shl ebx, #16 or eax, ebx SEG SS mul eax, dword ptr [di] mov ebx, eax shr ebx, #16 ret ;; dec function ldecl: ldecul: SEG SS dec dword ptr [bx] ret ;; or function lorl: lorul: SEG SS or ax,[di] SEG SS or bx,2[di] ret ;; inc function lincl: lincul: SEG SS inc dword ptr [bx] ret ;; tst function ltstl: ltstul: and eax, #0x0000FFFF shl ebx, #16 or eax, ebx shr ebx, #16 test eax, eax ret ;; sr function lsrul: mov cx,di jcxz lsr_exit and eax, #0x0000FFFF shl ebx, #16 or eax, ebx lsr_loop: shr eax, #1 loop lsr_loop mov ebx, eax shr ebx, #16 lsr_exit: ret ;; sl function lsll: lslul: mov cx,di jcxz lsl_exit and eax, #0x0000FFFF shl ebx, #16 or eax, ebx lsl_loop: shl eax, #1 loop lsl_loop mov ebx, eax shr ebx, #16 lsl_exit: ret idiv_: cwd idiv bx ret idiv_u: xor dx,dx div bx ret ldivul: and eax, #0x0000FFFF shl ebx, #16 or eax, ebx xor edx, edx SEG SS mov bx, 2[di] shl ebx, #16 SEG SS mov bx, [di] div ebx mov ebx, eax shr ebx, #16 ret ASM_END // for access to RAM area which is used by interrupt vectors // and BIOS Data Area typedef struct { unsigned char filler1[0x400]; unsigned char filler2[0x6c]; Bit16u ticks_low; Bit16u ticks_high; Bit8u midnight_flag; } bios_data_t; #define BiosData ((bios_data_t *) 0) #if BX_USE_ATADRV typedef struct { Bit16u heads; // # heads Bit16u cylinders; // # cylinders Bit16u spt; // # sectors / track } chs_t; // DPTE definition typedef struct { Bit16u iobase1; Bit16u iobase2; Bit8u prefix; Bit8u unused; Bit8u irq; Bit8u blkcount; Bit8u dma; Bit8u pio; Bit16u options; Bit16u reserved; Bit8u revision; Bit8u checksum; } dpte_t; typedef struct { Bit8u iface; // ISA or PCI Bit16u iobase1; // IO Base 1 Bit16u iobase2; // IO Base 2 Bit8u irq; // IRQ } ata_channel_t; typedef struct { Bit8u type; // Detected type of ata (ata/atapi/none/unknown) Bit8u device; // Detected type of attached devices (hd/cd/none) Bit8u removable; // Removable device flag Bit8u lock; // Locks for removable devices Bit8u mode; // transfer mode : PIO 16/32 bits - IRQ - ISADMA - PCIDMA Bit16u blksize; // block size Bit8u translation; // type of translation chs_t lchs; // Logical CHS chs_t pchs; // Physical CHS Bit32u sectors_low; // Total sectors count Bit32u sectors_high; } ata_device_t; typedef struct { // ATA channels info ata_channel_t channels[BX_MAX_ATA_INTERFACES]; // ATA devices info ata_device_t devices[BX_MAX_ATA_DEVICES]; // // map between (bios hd id - 0x80) and ata channels Bit8u hdcount, hdidmap[BX_MAX_ATA_DEVICES]; // map between (bios cd id - 0xE0) and ata channels Bit8u cdcount, cdidmap[BX_MAX_ATA_DEVICES]; // Buffer for DPTE table dpte_t dpte; // Count of transferred sectors and bytes Bit16u trsfsectors; Bit32u trsfbytes; } ata_t; #if BX_ELTORITO_BOOT // ElTorito Device Emulation data typedef struct { Bit8u active; Bit8u media; Bit8u emulated_drive; Bit8u controller_index; Bit16u device_spec; Bit32u ilba; Bit16u buffer_segment; Bit16u load_segment; Bit16u sector_count; // Virtual device chs_t vdevice; } cdemu_t; #endif // BX_ELTORITO_BOOT // for access to EBDA area // The EBDA structure should conform to // http://www.frontiernet.net/~fys/rombios.htm document // I made the ata and cdemu structs begin at 0x121 in the EBDA seg // EBDA must be at most 768 bytes; it lives at EBDA_SEG, and the boot // device tables are at IPL_SEG typedef struct { Bit8u size; unsigned char filler0[0x21]; Bit16u mouse_driver_offset; Bit16u mouse_driver_seg; Bit8u mouse_flag1; Bit8u mouse_flag2; Bit8u mouse_data[0x08]; unsigned char filler1[0x0D]; // FDPT - Can be split into data members if needed unsigned char fdpt0[0x10]; unsigned char fdpt1[0x10]; unsigned char filler2[0xC4]; // ATA Driver data ata_t ata; #if BX_ELTORITO_BOOT // El Torito Emulation data cdemu_t cdemu; #endif // BX_ELTORITO_BOOT } ebda_data_t; #define EbdaData ((ebda_data_t *) 0) // for access to the int13ext structure typedef struct { Bit8u size; Bit8u reserved; Bit16u count; Bit16u offset; Bit16u segment; Bit32u lba1; Bit32u lba2; } int13ext_t; #define Int13Ext ((int13ext_t *) 0) // Disk Physical Table definition typedef struct { Bit16u size; Bit16u infos; Bit32u cylinders; Bit32u heads; Bit32u spt; Bit32u sector_count1; Bit32u sector_count2; Bit16u blksize; Bit16u dpte_offset; Bit16u dpte_segment; union { struct { Bit16u key; Bit8u dpi_length; Bit8u reserved1; Bit16u reserved2; Bit8u host_bus[4]; Bit8u iface_type[8]; Bit8u iface_path[8]; Bit8u device_path[8]; Bit8u reserved3; Bit8u checksum; } phoenix; struct { Bit16u key; Bit8u dpi_length; Bit8u reserved1; Bit16u reserved2; Bit8u host_bus[4]; Bit8u iface_type[8]; Bit8u iface_path[8]; Bit8u device_path[16]; Bit8u reserved3; Bit8u checksum; } t13; } dpi; } dpt_t; #define Int13DPT ((dpt_t *) 0) #endif // BX_USE_ATADRV typedef struct { union { struct { Bit16u di, si, bp, sp; Bit16u bx, dx, cx, ax; } r16; struct { Bit16u filler[4]; Bit8u bl, bh, dl, dh, cl, ch, al, ah; } r8; } u; } pusha_regs_t; typedef struct { union { struct { Bit32u edi, esi, ebp, esp; Bit32u ebx, edx, ecx, eax; } r32; struct { Bit16u di, filler1, si, filler2, bp, filler3, sp, filler4; Bit16u bx, filler5, dx, filler6, cx, filler7, ax, filler8; } r16; struct { Bit32u filler[4]; Bit8u bl, bh; Bit16u filler1; Bit8u dl, dh; Bit16u filler2; Bit8u cl, ch; Bit16u filler3; Bit8u al, ah; Bit16u filler4; } r8; } u; } pushad_regs_t; typedef struct { union { struct { Bit16u flags; } r16; struct { Bit8u flagsl; Bit8u flagsh; } r8; } u; } flags_t; #define SetCF(x) x.u.r8.flagsl |= 0x01 #define SetZF(x) x.u.r8.flagsl |= 0x40 #define ClearCF(x) x.u.r8.flagsl &= 0xfe #define ClearZF(x) x.u.r8.flagsl &= 0xbf #define GetCF(x) (x.u.r8.flagsl & 0x01) typedef struct { Bit16u ip; Bit16u cs; flags_t flags; } iret_addr_t; typedef struct { Bit16u type; Bit16u flags; Bit32u vector; Bit32u description; Bit32u reserved; } ipl_entry_t; static Bit8u inb(); static Bit8u inb_cmos(); static void outb(); static void outb_cmos(); static Bit16u inw(); static void outw(); static void init_rtc(); static bx_bool rtc_updating(); static Bit8u read_byte(); static Bit16u read_word(); static void write_byte(); static void write_word(); static void bios_printf(); static Bit8u inhibit_mouse_int_and_events(); static void enable_mouse_int_and_events(); static Bit8u send_to_mouse_ctrl(); static Bit8u get_mouse_data(); static void set_kbd_command_byte(); static void int09_function(); static void int13_harddisk(); static void int13_cdrom(); static void int13_cdemu(); static void int13_eltorito(); static void int13_diskette_function(); static void int14_function(); static void int15_function(); static void int16_function(); static void int17_function(); static void int19_function(); static void int1a_function(); static void int70_function(); static void int74_function(); static Bit16u get_CS(); static Bit16u get_SS(); static unsigned int enqueue_key(); static unsigned int dequeue_key(); static void get_hd_geometry(); static void set_diskette_ret_status(); static void set_diskette_current_cyl(); static void determine_floppy_media(); static bx_bool floppy_drive_exists(); static bx_bool floppy_drive_recal(); static bx_bool floppy_media_known(); static bx_bool floppy_media_sense(); static bx_bool set_enable_a20(); static void debugger_on(); static void debugger_off(); static void keyboard_init(); static void keyboard_panic(); static void shutdown_status_panic(); static void nmi_handler_msg(); static void delay_ticks(); static void delay_ticks_and_check_for_keystroke(); static void interactive_bootkey(); static void print_bios_banner(); static void print_boot_device(); static void print_boot_failure(); static void print_cdromboot_failure(); # if BX_USE_ATADRV // ATA / ATAPI driver void ata_init(); void ata_detect(); void ata_reset(); Bit16u ata_cmd_non_data(); Bit16u ata_cmd_data_in(); Bit16u ata_cmd_data_out(); Bit16u ata_cmd_packet(); Bit16u atapi_get_sense(); Bit16u atapi_is_ready(); Bit16u atapi_is_cdrom(); #endif // BX_USE_ATADRV #if BX_ELTORITO_BOOT void cdemu_init(); Bit8u cdemu_isactive(); Bit8u cdemu_emulated_drive(); Bit16u cdrom_boot(); #endif // BX_ELTORITO_BOOT static char bios_cvs_version_string[] = "$Revision$ $Date$"; #define BIOS_COPYRIGHT_STRING "(c) 2002-2010 MandrakeSoft S.A. Written by Kevin Lawton & the Bochs team." #if DEBUG_ATA # define BX_DEBUG_ATA(a...) BX_DEBUG(a) #else # define BX_DEBUG_ATA(a...) #endif #if DEBUG_INT13_HD # define BX_DEBUG_INT13_HD(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT13_HD(a...) #endif #if DEBUG_INT13_CD # define BX_DEBUG_INT13_CD(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT13_CD(a...) #endif #if DEBUG_INT13_ET # define BX_DEBUG_INT13_ET(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT13_ET(a...) #endif #if DEBUG_INT13_FL # define BX_DEBUG_INT13_FL(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT13_FL(a...) #endif #if DEBUG_INT15 # define BX_DEBUG_INT15(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT15(a...) #endif #if DEBUG_INT16 # define BX_DEBUG_INT16(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT16(a...) #endif #if DEBUG_INT1A # define BX_DEBUG_INT1A(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT1A(a...) #endif #if DEBUG_INT74 # define BX_DEBUG_INT74(a...) BX_DEBUG(a) #else # define BX_DEBUG_INT74(a...) #endif #define SET_AL(val8) AX = ((AX & 0xff00) | (val8)) #define SET_BL(val8) BX = ((BX & 0xff00) | (val8)) #define SET_CL(val8) CX = ((CX & 0xff00) | (val8)) #define SET_DL(val8) DX = ((DX & 0xff00) | (val8)) #define SET_AH(val8) AX = ((AX & 0x00ff) | ((val8) << 8)) #define SET_BH(val8) BX = ((BX & 0x00ff) | ((val8) << 8)) #define SET_CH(val8) CX = ((CX & 0x00ff) | ((val8) << 8)) #define SET_DH(val8) DX = ((DX & 0x00ff) | ((val8) << 8)) #define GET_AL() ( AX & 0x00ff ) #define GET_BL() ( BX & 0x00ff ) #define GET_CL() ( CX & 0x00ff ) #define GET_DL() ( DX & 0x00ff ) #define GET_AH() ( AX >> 8 ) #define GET_BH() ( BX >> 8 ) #define GET_CH() ( CX >> 8 ) #define GET_DH() ( DX >> 8 ) #define GET_ELDL() ( ELDX & 0x00ff ) #define GET_ELDH() ( ELDX >> 8 ) #define SET_CF() FLAGS |= 0x0001 #define CLEAR_CF() FLAGS &= 0xfffe #define GET_CF() (FLAGS & 0x0001) #define SET_ZF() FLAGS |= 0x0040 #define CLEAR_ZF() FLAGS &= 0xffbf #define GET_ZF() (FLAGS & 0x0040) #define UNSUPPORTED_FUNCTION 0x86 #define none 0 #define MAX_SCAN_CODE 0x58 static struct { Bit16u normal; Bit16u shift; Bit16u control; Bit16u alt; Bit8u lock_flags; } scan_to_scanascii[MAX_SCAN_CODE + 1] = { { none, none, none, none, none }, { 0x011b, 0x011b, 0x011b, 0x0100, none }, /* escape */ { 0x0231, 0x0221, none, 0x7800, none }, /* 1! */ { 0x0332, 0x0340, 0x0300, 0x7900, none }, /* 2@ */ { 0x0433, 0x0423, none, 0x7a00, none }, /* 3# */ { 0x0534, 0x0524, none, 0x7b00, none }, /* 4$ */ { 0x0635, 0x0625, none, 0x7c00, none }, /* 5% */ { 0x0736, 0x075e, 0x071e, 0x7d00, none }, /* 6^ */ { 0x0837, 0x0826, none, 0x7e00, none }, /* 7& */ { 0x0938, 0x092a, none, 0x7f00, none }, /* 8* */ { 0x0a39, 0x0a28, none, 0x8000, none }, /* 9( */ { 0x0b30, 0x0b29, none, 0x8100, none }, /* 0) */ { 0x0c2d, 0x0c5f, 0x0c1f, 0x8200, none }, /* -_ */ { 0x0d3d, 0x0d2b, none, 0x8300, none }, /* =+ */ { 0x0e08, 0x0e08, 0x0e7f, none, none }, /* backspace */ { 0x0f09, 0x0f00, none, none, none }, /* tab */ { 0x1071, 0x1051, 0x1011, 0x1000, 0x40 }, /* Q */ { 0x1177, 0x1157, 0x1117, 0x1100, 0x40 }, /* W */ { 0x1265, 0x1245, 0x1205, 0x1200, 0x40 }, /* E */ { 0x1372, 0x1352, 0x1312, 0x1300, 0x40 }, /* R */ { 0x1474, 0x1454, 0x1414, 0x1400, 0x40 }, /* T */ { 0x1579, 0x1559, 0x1519, 0x1500, 0x40 }, /* Y */ { 0x1675, 0x1655, 0x1615, 0x1600, 0x40 }, /* U */ { 0x1769, 0x1749, 0x1709, 0x1700, 0x40 }, /* I */ { 0x186f, 0x184f, 0x180f, 0x1800, 0x40 }, /* O */ { 0x1970, 0x1950, 0x1910, 0x1900, 0x40 }, /* P */ { 0x1a5b, 0x1a7b, 0x1a1b, none, none }, /* [{ */ { 0x1b5d, 0x1b7d, 0x1b1d, none, none }, /* ]} */ { 0x1c0d, 0x1c0d, 0x1c0a, none, none }, /* Enter */ { none, none, none, none, none }, /* L Ctrl */ { 0x1e61, 0x1e41, 0x1e01, 0x1e00, 0x40 }, /* A */ { 0x1f73, 0x1f53, 0x1f13, 0x1f00, 0x40 }, /* S */ { 0x2064, 0x2044, 0x2004, 0x2000, 0x40 }, /* D */ { 0x2166, 0x2146, 0x2106, 0x2100, 0x40 }, /* F */ { 0x2267, 0x2247, 0x2207, 0x2200, 0x40 }, /* G */ { 0x2368, 0x2348, 0x2308, 0x2300, 0x40 }, /* H */ { 0x246a, 0x244a, 0x240a, 0x2400, 0x40 }, /* J */ { 0x256b, 0x254b, 0x250b, 0x2500, 0x40 }, /* K */ { 0x266c, 0x264c, 0x260c, 0x2600, 0x40 }, /* L */ { 0x273b, 0x273a, none, none, none }, /* ;: */ { 0x2827, 0x2822, none, none, none }, /* '" */ { 0x2960, 0x297e, none, none, none }, /* `~ */ { none, none, none, none, none }, /* L shift */ { 0x2b5c, 0x2b7c, 0x2b1c, none, none }, /* |\ */ { 0x2c7a, 0x2c5a, 0x2c1a, 0x2c00, 0x40 }, /* Z */ { 0x2d78, 0x2d58, 0x2d18, 0x2d00, 0x40 }, /* X */ { 0x2e63, 0x2e43, 0x2e03, 0x2e00, 0x40 }, /* C */ { 0x2f76, 0x2f56, 0x2f16, 0x2f00, 0x40 }, /* V */ { 0x3062, 0x3042, 0x3002, 0x3000, 0x40 }, /* B */ { 0x316e, 0x314e, 0x310e, 0x3100, 0x40 }, /* N */ { 0x326d, 0x324d, 0x320d, 0x3200, 0x40 }, /* M */ { 0x332c, 0x333c, none, none, none }, /* ,< */ { 0x342e, 0x343e, none, none, none }, /* .> */ { 0x352f, 0x353f, none, none, none }, /* /? */ { none, none, none, none, none }, /* R Shift */ { 0x372a, 0x372a, none, none, none }, /* * */ { none, none, none, none, none }, /* L Alt */ { 0x3920, 0x3920, 0x3920, 0x3920, none }, /* space */ { none, none, none, none, none }, /* caps lock */ { 0x3b00, 0x5400, 0x5e00, 0x6800, none }, /* F1 */ { 0x3c00, 0x5500, 0x5f00, 0x6900, none }, /* F2 */ { 0x3d00, 0x5600, 0x6000, 0x6a00, none }, /* F3 */ { 0x3e00, 0x5700, 0x6100, 0x6b00, none }, /* F4 */ { 0x3f00, 0x5800, 0x6200, 0x6c00, none }, /* F5 */ { 0x4000, 0x5900, 0x6300, 0x6d00, none }, /* F6 */ { 0x4100, 0x5a00, 0x6400, 0x6e00, none }, /* F7 */ { 0x4200, 0x5b00, 0x6500, 0x6f00, none }, /* F8 */ { 0x4300, 0x5c00, 0x6600, 0x7000, none }, /* F9 */ { 0x4400, 0x5d00, 0x6700, 0x7100, none }, /* F10 */ { none, none, none, none, none }, /* Num Lock */ { none, none, none, none, none }, /* Scroll Lock */ { 0x4700, 0x4737, 0x7700, none, 0x20 }, /* 7 Home */ { 0x4800, 0x4838, none, none, 0x20 }, /* 8 UP */ { 0x4900, 0x4939, 0x8400, none, 0x20 }, /* 9 PgUp */ { 0x4a2d, 0x4a2d, none, none, none }, /* - */ { 0x4b00, 0x4b34, 0x7300, none, 0x20 }, /* 4 Left */ { 0x4c00, 0x4c35, none, none, 0x20 }, /* 5 */ { 0x4d00, 0x4d36, 0x7400, none, 0x20 }, /* 6 Right */ { 0x4e2b, 0x4e2b, none, none, none }, /* + */ { 0x4f00, 0x4f31, 0x7500, none, 0x20 }, /* 1 End */ { 0x5000, 0x5032, none, none, 0x20 }, /* 2 Down */ { 0x5100, 0x5133, 0x7600, none, 0x20 }, /* 3 PgDn */ { 0x5200, 0x5230, none, none, 0x20 }, /* 0 Ins */ { 0x5300, 0x532e, none, none, 0x20 }, /* Del */ { none, none, none, none, none }, { none, none, none, none, none }, { 0x565c, 0x567c, none, none, none }, /* \| */ { 0x8500, 0x8700, 0x8900, 0x8b00, none }, /* F11 */ { 0x8600, 0x8800, 0x8a00, 0x8c00, none }, /* F12 */ }; Bit8u inb(port) Bit16u port; { ASM_START push bp mov bp, sp push dx mov dx, 4[bp] in al, dx pop dx pop bp ASM_END } #if BX_USE_ATADRV Bit16u inw(port) Bit16u port; { ASM_START push bp mov bp, sp push dx mov dx, 4[bp] in ax, dx pop dx pop bp ASM_END } #endif void outb(port, val) Bit16u port; Bit8u val; { ASM_START push bp mov bp, sp push ax push dx mov dx, 4[bp] mov al, 6[bp] out dx, al pop dx pop ax pop bp ASM_END } #if BX_USE_ATADRV void outw(port, val) Bit16u port; Bit16u val; { ASM_START push bp mov bp, sp push ax push dx mov dx, 4[bp] mov ax, 6[bp] out dx, ax pop dx pop ax pop bp ASM_END } #endif void outb_cmos(cmos_reg, val) Bit8u cmos_reg; Bit8u val; { ASM_START push bp mov bp, sp mov al, 4[bp] ;; cmos_reg out PORT_CMOS_INDEX, al mov al, 6[bp] ;; val out PORT_CMOS_DATA, al pop bp ASM_END } Bit8u inb_cmos(cmos_reg) Bit8u cmos_reg; { ASM_START push bp mov bp, sp mov al, 4[bp] ;; cmos_reg out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA pop bp ASM_END } void init_rtc() { outb_cmos(0x0a, 0x26); outb_cmos(0x0b, 0x02); inb_cmos(0x0c); inb_cmos(0x0d); } bx_bool rtc_updating() { // This function checks to see if the update-in-progress bit // is set in CMOS Status Register A. If not, it returns 0. // If it is set, it tries to wait until there is a transition // to 0, and will return 0 if such a transition occurs. A 1 // is returned only after timing out. The maximum period // that this bit should be set is constrained to 244useconds. // The count I use below guarantees coverage or more than // this time, with any reasonable IPS setting. Bit16u count; count = 25000; while (--count != 0) { if ( (inb_cmos(0x0a) & 0x80) == 0 ) return(0); } return(1); // update-in-progress never transitioned to 0 } Bit8u read_byte(seg, offset) Bit16u seg; Bit16u offset; { ASM_START push bp mov bp, sp push bx push ds mov ax, 4[bp] ; segment mov ds, ax mov bx, 6[bp] ; offset mov al, [bx] ;; al = return value (byte) pop ds pop bx pop bp ASM_END } Bit16u read_word(seg, offset) Bit16u seg; Bit16u offset; { ASM_START push bp mov bp, sp push bx push ds mov ax, 4[bp] ; segment mov ds, ax mov bx, 6[bp] ; offset mov ax, [bx] ;; ax = return value (word) pop ds pop bx pop bp ASM_END } void write_byte(seg, offset, data) Bit16u seg; Bit16u offset; Bit8u data; { ASM_START push bp mov bp, sp push ax push bx push ds mov ax, 4[bp] ; segment mov ds, ax mov bx, 6[bp] ; offset mov al, 8[bp] ; data byte mov [bx], al ; write data byte pop ds pop bx pop ax pop bp ASM_END } void write_word(seg, offset, data) Bit16u seg; Bit16u offset; Bit16u data; { ASM_START push bp mov bp, sp push ax push bx push ds mov ax, 4[bp] ; segment mov ds, ax mov bx, 6[bp] ; offset mov ax, 8[bp] ; data word mov [bx], ax ; write data word pop ds pop bx pop ax pop bp ASM_END } Bit16u get_CS() { ASM_START mov ax, cs ASM_END } Bit16u get_SS() { ASM_START mov ax, ss ASM_END } #if BX_DEBUG_SERIAL /* serial debug port*/ #define BX_DEBUG_PORT 0x03f8 /* data */ #define UART_RBR 0x00 #define UART_THR 0x00 /* control */ #define UART_IER 0x01 #define UART_IIR 0x02 #define UART_FCR 0x02 #define UART_LCR 0x03 #define UART_MCR 0x04 #define UART_DLL 0x00 #define UART_DLM 0x01 /* status */ #define UART_LSR 0x05 #define UART_MSR 0x06 #define UART_SCR 0x07 int uart_can_tx_byte(base_port) Bit16u base_port; { return inb(base_port + UART_LSR) & 0x20; } void uart_wait_to_tx_byte(base_port) Bit16u base_port; { while (!uart_can_tx_byte(base_port)); } void uart_wait_until_sent(base_port) Bit16u base_port; { while (!(inb(base_port + UART_LSR) & 0x40)); } void uart_tx_byte(base_port, data) Bit16u base_port; Bit8u data; { uart_wait_to_tx_byte(base_port); outb(base_port + UART_THR, data); uart_wait_until_sent(base_port); } #endif void wrch(c) Bit8u c; { ASM_START push bp mov bp, sp push bx mov ah, #0x0e mov al, 4[bp] xor bx,bx int #0x10 pop bx pop bp ASM_END } void send(action, c) Bit16u action; Bit8u c; { #if BX_DEBUG_SERIAL if (c == '\n') uart_tx_byte(BX_DEBUG_PORT, '\r'); uart_tx_byte(BX_DEBUG_PORT, c); #endif #if BX_VIRTUAL_PORTS if (action & BIOS_PRINTF_DEBUG) outb(DEBUG_PORT, c); if (action & BIOS_PRINTF_INFO) outb(INFO_PORT, c); #endif if (action & BIOS_PRINTF_SCREEN) { if (c == '\n') wrch('\r'); wrch(c); } } void put_int(action, val, width, neg) Bit16u action; short val, width; bx_bool neg; { short nval = val / 10; if (nval) put_int(action, nval, width - 1, neg); else { while (--width > 0) send(action, ' '); if (neg) send(action, '-'); } send(action, val - (nval * 10) + '0'); } void put_uint(action, val, width, neg) Bit16u action; unsigned short val; short width; bx_bool neg; { unsigned short nval = val / 10; if (nval) put_uint(action, nval, width - 1, neg); else { while (--width > 0) send(action, ' '); if (neg) send(action, '-'); } send(action, val - (nval * 10) + '0'); } void put_luint(action, val, width, neg) Bit16u action; unsigned long val; short width; bx_bool neg; { unsigned long nval = val / 10; if (nval) put_luint(action, nval, width - 1, neg); else { while (--width > 0) send(action, ' '); if (neg) send(action, '-'); } send(action, val - (nval * 10) + '0'); } void put_str(action, segment, offset) Bit16u action; Bit16u segment; Bit16u offset; { Bit8u c; while (c = read_byte(segment, offset)) { send(action, c); offset++; } } void delay_ticks(ticks) Bit16u ticks; { long ticks_to_wait, delta; Bit32u prev_ticks, t; /* * The 0:046c wraps around at 'midnight' according to a 18.2Hz clock. * We also have to be careful about interrupt storms. */ ASM_START pushf sti ASM_END ticks_to_wait = ticks; prev_ticks = read_dword(0x0, 0x46c); do { ASM_START hlt ASM_END t = read_dword(0x0, 0x46c); if (t > prev_ticks) { delta = t - prev_ticks; /* The temp var is required or bcc screws up. */ ticks_to_wait -= delta; } else if (t < prev_ticks) { ticks_to_wait -= t; /* wrapped */ } prev_ticks = t; } while (ticks_to_wait > 0); ASM_START cli popf ASM_END } Bit8u check_for_keystroke() { ASM_START mov ax, #0x100 int #0x16 jz no_key mov al, #1 jmp done no_key: xor al, al done: ASM_END } Bit8u get_keystroke() { ASM_START mov ax, #0x0 int #0x16 xchg ah, al ASM_END } void delay_ticks_and_check_for_keystroke(ticks, count) Bit16u ticks, count; { Bit16u i; for (i = 1; i <= count; i++) { delay_ticks(ticks); if (check_for_keystroke()) break; } } //-------------------------------------------------------------------------- // bios_printf() // A compact variable argument printf function. // // Supports %[format_width][length]format // where format can be x,X,u,d,s,S,c // and the optional length modifier is l (ell) //-------------------------------------------------------------------------- void bios_printf(action, s) Bit16u action; Bit8u *s; { Bit8u c, format_char; bx_bool in_format; short i; Bit16u *arg_ptr; Bit16u arg_seg, arg, nibble, hibyte, shift_count, format_width, hexadd; arg_ptr = &s; arg_seg = get_SS(); in_format = 0; format_width = 0; if ((action & BIOS_PRINTF_DEBHALT) == BIOS_PRINTF_DEBHALT) { #if BX_VIRTUAL_PORTS outb(PANIC_PORT2, 0x00); #endif bios_printf (BIOS_PRINTF_SCREEN, "FATAL: "); } while (c = read_byte(get_CS(), s)) { if ( c == '%' ) { in_format = 1; format_width = 0; } else if (in_format) { if ( (c>='0') && (c<='9') ) { format_width = (format_width * 10) + (c - '0'); } else { arg_ptr++; // increment to next arg arg = read_word(arg_seg, arg_ptr); if (c == 'x' || c == 'X') { if (format_width == 0) format_width = 4; if (c == 'x') hexadd = 'a'; else hexadd = 'A'; for (i=format_width-1; i>=0; i--) { nibble = (arg >> (4 * i)) & 0x000f; send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd)); } } else if (c == 'u') { put_uint(action, arg, format_width, 0); } else if (c == 'l') { s++; c = read_byte(get_CS(), s); /* is it ld,lx,lu? */ arg_ptr++; /* increment to next arg */ hibyte = read_word(arg_seg, arg_ptr); if (c == 'd') { if (hibyte & 0x8000) put_luint(action, 0L-(((Bit32u) hibyte << 16) | arg), format_width-1, 1); else put_luint(action, ((Bit32u) hibyte << 16) | arg, format_width, 0); } else if (c == 'u') { put_luint(action, ((Bit32u) hibyte << 16) | arg, format_width, 0); } else if (c == 'x' || c == 'X') { if (format_width == 0) format_width = 8; if (c == 'x') hexadd = 'a'; else hexadd = 'A'; for (i=format_width-1; i>=0; i--) { nibble = ((((Bit32u) hibyte <<16) | arg) >> (4 * i)) & 0x000f; send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd)); } } } else if (c == 'd') { if (arg & 0x8000) put_int(action, -arg, format_width - 1, 1); else put_int(action, arg, format_width, 0); } else if (c == 's') { put_str(action, get_CS(), arg); } else if (c == 'S') { hibyte = arg; arg_ptr++; arg = read_word(arg_seg, arg_ptr); put_str(action, hibyte, arg); } else if (c == 'c') { send(action, arg); } else BX_PANIC("bios_printf: unknown format\n"); in_format = 0; } } else { send(action, c); } s ++; } if (action & BIOS_PRINTF_HALT) { // freeze in a busy loop. ASM_START cli halt2_loop: hlt jmp halt2_loop ASM_END } } //-------------------------------------------------------------------------- // keyboard_init //-------------------------------------------------------------------------- // this file is based on LinuxBIOS implementation of keyboard.c // could convert to #asm to gain space void keyboard_init() { Bit16u max; /* ------------------- Flush buffers ------------------------*/ /* Wait until buffer is empty */ max=0xffff; while ( (inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x00); /* flush incoming keys */ max=0x2000; while (--max > 0) { outb(PORT_DIAG, 0x00); if (inb(PORT_PS2_STATUS) & 0x01) { inb(PORT_PS2_DATA); max = 0x2000; } } // Due to timer issues, and if the IPS setting is > 15000000, // the incoming keys might not be flushed here. That will // cause a panic a few lines below. See sourceforge bug report : // [ 642031 ] FATAL: Keyboard RESET error:993 /* ------------------- controller side ----------------------*/ /* send cmd = 0xAA, self test 8042 */ outb(PORT_PS2_STATUS, 0xaa); /* Wait until buffer is empty */ max=0xffff; while ( (inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x00); if (max==0x0) keyboard_panic(00); /* Wait for data */ max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x01); if (max==0x0) keyboard_panic(01); /* read self-test result, 0x55 should be returned from 0x60 */ if ((inb(PORT_PS2_DATA) != 0x55)){ keyboard_panic(991); } /* send cmd = 0xAB, keyboard interface test */ outb(PORT_PS2_STATUS,0xab); /* Wait until buffer is empty */ max=0xffff; while ((inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x10); if (max==0x0) keyboard_panic(10); /* Wait for data */ max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x11); if (max==0x0) keyboard_panic(11); /* read keyboard interface test result, */ /* 0x00 should be returned form 0x60 */ if ((inb(PORT_PS2_DATA) != 0x00)) { keyboard_panic(992); } /* Enable Keyboard clock */ outb(PORT_PS2_STATUS,0xae); outb(PORT_PS2_STATUS,0xa8); /* ------------------- keyboard side ------------------------*/ /* reset keyboard and self test (keyboard side) */ outb(PORT_PS2_DATA, 0xff); /* Wait until buffer is empty */ max=0xffff; while ((inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x20); if (max==0x0) keyboard_panic(20); /* Wait for data */ max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x21); if (max==0x0) keyboard_panic(21); /* keyboard should return ACK */ if ((inb(PORT_PS2_DATA) != 0xfa)) { keyboard_panic(993); } /* Wait for data */ max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x31); if (max==0x0) keyboard_panic(31); if ((inb(PORT_PS2_DATA) != 0xaa)) { keyboard_panic(994); } /* Disable keyboard */ outb(PORT_PS2_DATA, 0xf5); /* Wait until buffer is empty */ max=0xffff; while ((inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x40); if (max==0x0) keyboard_panic(40); /* Wait for data */ max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x41); if (max==0x0) keyboard_panic(41); /* keyboard should return ACK */ if ((inb(PORT_PS2_DATA) != 0xfa)) { keyboard_panic(995); } /* Write Keyboard Mode */ outb(PORT_PS2_STATUS, 0x60); /* Wait until buffer is empty */ max=0xffff; while ((inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x50); if (max==0x0) keyboard_panic(50); /* send cmd: scan code convert, disable mouse, enable IRQ 1 */ outb(PORT_PS2_DATA, 0x61); /* Wait until buffer is empty */ max=0xffff; while ((inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x60); if (max==0x0) keyboard_panic(60); /* Enable keyboard */ outb(PORT_PS2_DATA, 0xf4); /* Wait until buffer is empty */ max=0xffff; while ((inb(PORT_PS2_STATUS) & 0x02) && (--max>0)) outb(PORT_DIAG, 0x70); if (max==0x0) keyboard_panic(70); /* Wait for data */ max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x71); if (max==0x0) keyboard_panic(70); /* keyboard should return ACK */ if ((inb(PORT_PS2_DATA) != 0xfa)) { keyboard_panic(996); } outb(PORT_DIAG, 0x77); } //-------------------------------------------------------------------------- // keyboard_panic //-------------------------------------------------------------------------- void keyboard_panic(status) Bit16u status; { // If you're getting a 993 keyboard panic here, // please see the comment in keyboard_init BX_PANIC("Keyboard error:%u\n",status); } //-------------------------------------------------------------------------- // shutdown_status_panic // called when the shutdown status is not implemented, displays the status //-------------------------------------------------------------------------- void shutdown_status_panic(status) Bit16u status; { BX_PANIC("Unimplemented shutdown status: %02x\n",(Bit8u)status); } void s3_resume_panic() { BX_PANIC("Returned from s3_resume.\n"); } //-------------------------------------------------------------------------- // print_bios_banner // displays a the bios version //-------------------------------------------------------------------------- void print_bios_banner() { printf(BX_APPNAME" BIOS - build: %s\n%s\nOptions: ", BIOS_BUILD_DATE, bios_cvs_version_string); printf( #if BX_APM "apmbios " #endif #if BX_PCIBIOS "pcibios " #endif #if BX_PNPBIOS "pnpbios " #endif #if BX_ELTORITO_BOOT "eltorito " #endif #if BX_ROMBIOS32 "rombios32 " #endif "\n\n"); } //-------------------------------------------------------------------------- // BIOS Boot Specification 1.0.1 compatibility // // Very basic support for the BIOS Boot Specification, which allows expansion // ROMs to register themselves as boot devices, instead of just stealing the // INT 19h boot vector. // // This is a hack: to do it properly requires a proper PnP BIOS and we aren't // one; we just lie to the option ROMs to make them behave correctly. // We also don't support letting option ROMs register as bootable disk // drives (BCVs), only as bootable devices (BEVs). // // http://www.phoenix.com/en/Customer+Services/White+Papers-Specs/pc+industry+specifications.htm //-------------------------------------------------------------------------- static char drivetypes[][10]={"", "Floppy","Hard Disk","CD-Rom", "Network"}; static void init_boot_vectors() { ipl_entry_t e; Bit16u count = 0; Bit16u ss = get_SS(); /* Clear out the IPL table. */ memsetb(IPL_SEG, IPL_TABLE_OFFSET, 0, IPL_SIZE); /* User selected device not set */ write_word(IPL_SEG, IPL_BOOTFIRST_OFFSET, 0xFFFF); /* Floppy drive */ e.type = IPL_TYPE_FLOPPY; e.flags = 0; e.vector = 0; e.description = 0; e.reserved = 0; memcpyb(IPL_SEG, IPL_TABLE_OFFSET + count * sizeof (e), ss, &e, sizeof (e)); count++; /* First HDD */ e.type = IPL_TYPE_HARDDISK; e.flags = 0; e.vector = 0; e.description = 0; e.reserved = 0; memcpyb(IPL_SEG, IPL_TABLE_OFFSET + count * sizeof (e), ss, &e, sizeof (e)); count++; #if BX_ELTORITO_BOOT /* CDROM */ e.type = IPL_TYPE_CDROM; e.flags = 0; e.vector = 0; e.description = 0; e.reserved = 0; memcpyb(IPL_SEG, IPL_TABLE_OFFSET + count * sizeof (e), ss, &e, sizeof (e)); count++; #endif /* Remember how many devices we have */ write_word(IPL_SEG, IPL_COUNT_OFFSET, count); /* Not tried booting anything yet */ write_word(IPL_SEG, IPL_SEQUENCE_OFFSET, 0xffff); } static Bit8u get_boot_vector(i, e) Bit16u i; ipl_entry_t *e; { Bit16u count; Bit16u ss = get_SS(); /* Get the count of boot devices, and refuse to overrun the array */ count = read_word(IPL_SEG, IPL_COUNT_OFFSET); if (i >= count) return 0; /* OK to read this device */ memcpyb(ss, e, IPL_SEG, IPL_TABLE_OFFSET + i * sizeof (*e), sizeof (*e)); return 1; } #if BX_ELTORITO_BOOT void interactive_bootkey() { ipl_entry_t e; Bit16u count; char description[33]; Bit8u scan_code; Bit8u i; Bit16u ss = get_SS(); Bit16u valid_choice = 0; while (check_for_keystroke()) get_keystroke(); printf("Press F12 for boot menu.\n\n"); delay_ticks_and_check_for_keystroke(11, 5); /* ~3 seconds */ if (check_for_keystroke()) { scan_code = get_keystroke(); if (scan_code == 0x86) /* F12 */ { while (check_for_keystroke()) get_keystroke(); printf("Select boot device:\n\n"); count = read_word(IPL_SEG, IPL_COUNT_OFFSET); for (i = 0; i < count; i++) { memcpyb(ss, &e, IPL_SEG, IPL_TABLE_OFFSET + i * sizeof (e), sizeof (e)); printf("%d. ", i+1); switch(e.type) { case IPL_TYPE_FLOPPY: case IPL_TYPE_HARDDISK: case IPL_TYPE_CDROM: printf("%s\n", drivetypes[e.type]); break; case IPL_TYPE_BEV: printf("%s", drivetypes[4]); if (e.description != 0) { memcpyb(ss, &description, (Bit16u)(e.description >> 16), (Bit16u)(e.description & 0xffff), 32); description[32] = 0; printf(" [%S]", ss, description); } printf("\n"); break; } } count++; while (!valid_choice) { scan_code = get_keystroke(); if (scan_code == 0x01 || scan_code == 0x58) /* ESC or F12 */ { valid_choice = 1; } else if (scan_code <= count) { valid_choice = 1; scan_code -= 1; /* Set user selected device */ write_word(IPL_SEG, IPL_BOOTFIRST_OFFSET, scan_code); } } printf("\n"); } } } #endif // BX_ELTORITO_BOOT //-------------------------------------------------------------------------- // print_boot_device // displays the boot device //-------------------------------------------------------------------------- void print_boot_device(e) ipl_entry_t *e; { Bit16u type; char description[33]; Bit16u ss = get_SS(); type = e->type; /* NIC appears as type 0x80 */ if (type == IPL_TYPE_BEV) type = 0x4; if (type == 0 || type > 0x4) BX_PANIC("Bad drive type\n"); printf("Booting from %s", drivetypes[type]); /* print product string if BEV */ if (type == 4 && e->description != 0) { /* first 32 bytes are significant */ memcpyb(ss, &description, (Bit16u)(e->description >> 16), (Bit16u)(e->description & 0xffff), 32); /* terminate string */ description[32] = 0; printf(" [%S]", ss, description); } printf("...\n"); } //-------------------------------------------------------------------------- // print_boot_failure // displays the reason why boot failed //-------------------------------------------------------------------------- void print_boot_failure(type, reason) Bit16u type; Bit8u reason; { if (type == 0 || type > 0x3) BX_PANIC("Bad drive type\n"); printf("Boot failed"); if (type < 4) { /* Report the reason too */ if (reason==0) printf(": not a bootable disk"); else printf(": could not read the boot disk"); } printf("\n\n"); } //-------------------------------------------------------------------------- // print_cdromboot_failure // displays the reason why boot failed //-------------------------------------------------------------------------- void print_cdromboot_failure( code ) Bit16u code; { bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, "CDROM boot failure code : %04x\n",code); return; } void nmi_handler_msg() { BX_PANIC("NMI Handler called\n"); } void int18_panic_msg() { BX_PANIC("INT18: BOOT FAILURE\n"); } void log_bios_start() { #if BX_DEBUG_SERIAL outb(BX_DEBUG_PORT+UART_LCR, 0x03); /* setup for serial logging: 8N1 */ #endif BX_INFO("%s\n", bios_cvs_version_string); } bx_bool set_enable_a20(val) bx_bool val; { Bit8u oldval; // Use PS2 System Control port A to set A20 enable // get current setting first oldval = inb(PORT_A20); // change A20 status if (val) outb(PORT_A20, oldval | 0x02); else outb(PORT_A20, oldval & 0xfd); return((oldval & 0x02) != 0); } void debugger_on() { outb(0xfedc, 0x01); } void debugger_off() { outb(0xfedc, 0x00); } int s3_resume() { Bit32u s3_wakeup_vector; Bit8u s3_resume_flag; s3_resume_flag = read_byte(0x40, 0xb0); s3_wakeup_vector = read_dword(0x40, 0xb2); BX_INFO("S3 resume called %x 0x%lx\n", s3_resume_flag, s3_wakeup_vector); if (s3_resume_flag != 0xFE || !s3_wakeup_vector) return 0; write_byte(0x40, 0xb0, 0); /* setup wakeup vector */ write_word(0x40, 0xb6, (s3_wakeup_vector & 0xF)); /* IP */ write_word(0x40, 0xb8, (s3_wakeup_vector >> 4)); /* CS */ BX_INFO("S3 resume jump to %x:%x\n", (s3_wakeup_vector >> 4), (s3_wakeup_vector & 0xF)); ASM_START jmpf [0x04b6] ASM_END return 1; } #if BX_USE_ATADRV // --------------------------------------------------------------------------- // Start of ATA/ATAPI Driver // --------------------------------------------------------------------------- // Global defines -- ATA register and register bits. // command block & control block regs #define ATA_CB_DATA 0 // data reg in/out pio_base_addr1+0 #define ATA_CB_ERR 1 // error in pio_base_addr1+1 #define ATA_CB_FR 1 // feature reg out pio_base_addr1+1 #define ATA_CB_SC 2 // sector count in/out pio_base_addr1+2 #define ATA_CB_SN 3 // sector number in/out pio_base_addr1+3 #define ATA_CB_CL 4 // cylinder low in/out pio_base_addr1+4 #define ATA_CB_CH 5 // cylinder high in/out pio_base_addr1+5 #define ATA_CB_DH 6 // device head in/out pio_base_addr1+6 #define ATA_CB_STAT 7 // primary status in pio_base_addr1+7 #define ATA_CB_CMD 7 // command out pio_base_addr1+7 #define ATA_CB_ASTAT 6 // alternate status in pio_base_addr2+6 #define ATA_CB_DC 6 // device control out pio_base_addr2+6 #define ATA_CB_DA 7 // device address in pio_base_addr2+7 #define ATA_CB_ER_ICRC 0x80 // ATA Ultra DMA bad CRC #define ATA_CB_ER_BBK 0x80 // ATA bad block #define ATA_CB_ER_UNC 0x40 // ATA uncorrected error #define ATA_CB_ER_MC 0x20 // ATA media change #define ATA_CB_ER_IDNF 0x10 // ATA id not found #define ATA_CB_ER_MCR 0x08 // ATA media change request #define ATA_CB_ER_ABRT 0x04 // ATA command aborted #define ATA_CB_ER_NTK0 0x02 // ATA track 0 not found #define ATA_CB_ER_NDAM 0x01 // ATA address mark not found #define ATA_CB_ER_P_SNSKEY 0xf0 // ATAPI sense key (mask) #define ATA_CB_ER_P_MCR 0x08 // ATAPI Media Change Request #define ATA_CB_ER_P_ABRT 0x04 // ATAPI command abort #define ATA_CB_ER_P_EOM 0x02 // ATAPI End of Media #define ATA_CB_ER_P_ILI 0x01 // ATAPI Illegal Length Indication // ATAPI Interrupt Reason bits in the Sector Count reg (CB_SC) #define ATA_CB_SC_P_TAG 0xf8 // ATAPI tag (mask) #define ATA_CB_SC_P_REL 0x04 // ATAPI release #define ATA_CB_SC_P_IO 0x02 // ATAPI I/O #define ATA_CB_SC_P_CD 0x01 // ATAPI C/D // bits 7-4 of the device/head (CB_DH) reg #define ATA_CB_DH_DEV0 0xa0 // select device 0 #define ATA_CB_DH_DEV1 0xb0 // select device 1 #define ATA_CB_DH_LBA 0x40 // use LBA // status reg (CB_STAT and CB_ASTAT) bits #define ATA_CB_STAT_BSY 0x80 // busy #define ATA_CB_STAT_RDY 0x40 // ready #define ATA_CB_STAT_DF 0x20 // device fault #define ATA_CB_STAT_WFT 0x20 // write fault (old name) #define ATA_CB_STAT_SKC 0x10 // seek complete #define ATA_CB_STAT_SERV 0x10 // service #define ATA_CB_STAT_DRQ 0x08 // data request #define ATA_CB_STAT_CORR 0x04 // corrected #define ATA_CB_STAT_IDX 0x02 // index #define ATA_CB_STAT_ERR 0x01 // error (ATA) #define ATA_CB_STAT_CHK 0x01 // check (ATAPI) // device control reg (CB_DC) bits #define ATA_CB_DC_HD15 0x08 // bit should always be set to one #define ATA_CB_DC_SRST 0x04 // soft reset #define ATA_CB_DC_NIEN 0x02 // disable interrupts // Most mandatory and optional ATA commands (from ATA-3), #define ATA_CMD_CFA_ERASE_SECTORS 0xC0 #define ATA_CMD_CFA_REQUEST_EXT_ERR_CODE 0x03 #define ATA_CMD_CFA_TRANSLATE_SECTOR 0x87 #define ATA_CMD_CFA_WRITE_MULTIPLE_WO_ERASE 0xCD #define ATA_CMD_CFA_WRITE_SECTORS_WO_ERASE 0x38 #define ATA_CMD_CHECK_POWER_MODE1 0xE5 #define ATA_CMD_CHECK_POWER_MODE2 0x98 #define ATA_CMD_DEVICE_RESET 0x08 #define ATA_CMD_EXECUTE_DEVICE_DIAGNOSTIC 0x90 #define ATA_CMD_FLUSH_CACHE 0xE7 #define ATA_CMD_FORMAT_TRACK 0x50 #define ATA_CMD_IDENTIFY_DEVICE 0xEC #define ATA_CMD_IDENTIFY_DEVICE_PACKET 0xA1 #define ATA_CMD_IDENTIFY_PACKET_DEVICE 0xA1 #define ATA_CMD_IDLE1 0xE3 #define ATA_CMD_IDLE2 0x97 #define ATA_CMD_IDLE_IMMEDIATE1 0xE1 #define ATA_CMD_IDLE_IMMEDIATE2 0x95 #define ATA_CMD_INITIALIZE_DRIVE_PARAMETERS 0x91 #define ATA_CMD_INITIALIZE_DEVICE_PARAMETERS 0x91 #define ATA_CMD_NOP 0x00 #define ATA_CMD_PACKET 0xA0 #define ATA_CMD_READ_BUFFER 0xE4 #define ATA_CMD_READ_DMA 0xC8 #define ATA_CMD_READ_DMA_QUEUED 0xC7 #define ATA_CMD_READ_MULTIPLE 0xC4 #define ATA_CMD_READ_SECTORS 0x20 #define ATA_CMD_READ_VERIFY_SECTORS 0x40 #define ATA_CMD_RECALIBRATE 0x10 #define ATA_CMD_REQUEST_SENSE 0x03 #define ATA_CMD_SEEK 0x70 #define ATA_CMD_SET_FEATURES 0xEF #define ATA_CMD_SET_MULTIPLE_MODE 0xC6 #define ATA_CMD_SLEEP1 0xE6 #define ATA_CMD_SLEEP2 0x99 #define ATA_CMD_STANDBY1 0xE2 #define ATA_CMD_STANDBY2 0x96 #define ATA_CMD_STANDBY_IMMEDIATE1 0xE0 #define ATA_CMD_STANDBY_IMMEDIATE2 0x94 #define ATA_CMD_WRITE_BUFFER 0xE8 #define ATA_CMD_WRITE_DMA 0xCA #define ATA_CMD_WRITE_DMA_QUEUED 0xCC #define ATA_CMD_WRITE_MULTIPLE 0xC5 #define ATA_CMD_WRITE_SECTORS 0x30 #define ATA_CMD_WRITE_VERIFY 0x3C #define ATA_IFACE_NONE 0x00 #define ATA_IFACE_ISA 0x00 #define ATA_IFACE_PCI 0x01 #define ATA_TYPE_NONE 0x00 #define ATA_TYPE_UNKNOWN 0x01 #define ATA_TYPE_ATA 0x02 #define ATA_TYPE_ATAPI 0x03 #define ATA_DEVICE_NONE 0x00 #define ATA_DEVICE_HD 0xFF #define ATA_DEVICE_CDROM 0x05 #define ATA_MODE_NONE 0x00 #define ATA_MODE_PIO16 0x00 #define ATA_MODE_PIO32 0x01 #define ATA_MODE_ISADMA 0x02 #define ATA_MODE_PCIDMA 0x03 #define ATA_MODE_USEIRQ 0x10 #define ATA_TRANSLATION_NONE 0 #define ATA_TRANSLATION_LBA 1 #define ATA_TRANSLATION_LARGE 2 #define ATA_TRANSLATION_RECHS 3 #define ATA_DATA_NO 0x00 #define ATA_DATA_IN 0x01 #define ATA_DATA_OUT 0x02 // --------------------------------------------------------------------------- // ATA/ATAPI driver : initialization // --------------------------------------------------------------------------- void ata_init( ) { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u channel, device; // Channels info init. for (channel=0; channelata.channels[channel].iface,ATA_IFACE_NONE); write_word(ebda_seg,&EbdaData->ata.channels[channel].iobase1,0x0); write_word(ebda_seg,&EbdaData->ata.channels[channel].iobase2,0x0); write_byte(ebda_seg,&EbdaData->ata.channels[channel].irq,0); } // Devices info init. for (device=0; deviceata.devices[device].type,ATA_TYPE_NONE); write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_NONE); write_byte(ebda_seg,&EbdaData->ata.devices[device].removable,0); write_byte(ebda_seg,&EbdaData->ata.devices[device].lock,0); write_byte(ebda_seg,&EbdaData->ata.devices[device].mode,ATA_MODE_NONE); write_word(ebda_seg,&EbdaData->ata.devices[device].blksize,0); write_byte(ebda_seg,&EbdaData->ata.devices[device].translation,ATA_TRANSLATION_NONE); write_word(ebda_seg,&EbdaData->ata.devices[device].lchs.heads,0); write_word(ebda_seg,&EbdaData->ata.devices[device].lchs.cylinders,0); write_word(ebda_seg,&EbdaData->ata.devices[device].lchs.spt,0); write_word(ebda_seg,&EbdaData->ata.devices[device].pchs.heads,0); write_word(ebda_seg,&EbdaData->ata.devices[device].pchs.cylinders,0); write_word(ebda_seg,&EbdaData->ata.devices[device].pchs.spt,0); write_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_low,0L); write_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_high,0L); } // hdidmap and cdidmap init. for (device=0; deviceata.hdidmap[device],BX_MAX_ATA_DEVICES); write_byte(ebda_seg,&EbdaData->ata.cdidmap[device],BX_MAX_ATA_DEVICES); } write_byte(ebda_seg,&EbdaData->ata.hdcount,0); write_byte(ebda_seg,&EbdaData->ata.cdcount,0); } #define TIMEOUT 0 #define BSY 1 #define NOT_BSY 2 #define NOT_BSY_DRQ 3 #define NOT_BSY_NOT_DRQ 4 #define NOT_BSY_RDY 5 #define IDE_TIMEOUT 32000u //32 seconds max for IDE ops int await_ide(); static int await_ide(when_done,base,timeout) Bit8u when_done; Bit16u base; Bit16u timeout; { Bit32u time=0,last=0; Bit16u status; Bit8u result; status = inb(base + ATA_CB_STAT); // for the times you're supposed to throw one away for(;;) { status = inb(base+ATA_CB_STAT); time++; if (when_done == BSY) result = status & ATA_CB_STAT_BSY; else if (when_done == NOT_BSY) result = !(status & ATA_CB_STAT_BSY); else if (when_done == NOT_BSY_DRQ) result = !(status & ATA_CB_STAT_BSY) && (status & ATA_CB_STAT_DRQ); else if (when_done == NOT_BSY_NOT_DRQ) result = !(status & ATA_CB_STAT_BSY) && !(status & ATA_CB_STAT_DRQ); else if (when_done == NOT_BSY_RDY) result = !(status & ATA_CB_STAT_BSY) && (status & ATA_CB_STAT_RDY); else if (when_done == TIMEOUT) result = 0; if (result) return 0; if (time>>16 != last) // mod 2048 each 16 ms { last = time >>16; BX_DEBUG_ATA("await_ide: (TIMEOUT,BSY,!BSY,!BSY_DRQ,!BSY_!DRQ,!BSY_RDY) %d time= %ld timeout= %d\n",when_done,time>>11, timeout); } if (status & ATA_CB_STAT_ERR) { BX_DEBUG_ATA("await_ide: ERROR (TIMEOUT,BSY,!BSY,!BSY_DRQ,!BSY_!DRQ,!BSY_RDY) %d time= %ld timeout= %d\n",when_done,time>>11, timeout); return -1; } if ((timeout == 0) || ((time>>11) > timeout)) break; } BX_INFO("IDE time out\n"); return -1; } // --------------------------------------------------------------------------- // ATA/ATAPI driver : device detection // --------------------------------------------------------------------------- void ata_detect( ) { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u hdcount, cdcount, device, type; Bit8u buffer[0x0200]; #if BX_MAX_ATA_INTERFACES > 0 write_byte(ebda_seg,&EbdaData->ata.channels[0].iface,ATA_IFACE_ISA); write_word(ebda_seg,&EbdaData->ata.channels[0].iobase1,PORT_ATA1_CMD_BASE); write_word(ebda_seg,&EbdaData->ata.channels[0].iobase2,0x3f0); write_byte(ebda_seg,&EbdaData->ata.channels[0].irq,14); #endif #if BX_MAX_ATA_INTERFACES > 1 write_byte(ebda_seg,&EbdaData->ata.channels[1].iface,ATA_IFACE_ISA); write_word(ebda_seg,&EbdaData->ata.channels[1].iobase1,PORT_ATA2_CMD_BASE); write_word(ebda_seg,&EbdaData->ata.channels[1].iobase2,0x370); write_byte(ebda_seg,&EbdaData->ata.channels[1].irq,15); #endif #if BX_MAX_ATA_INTERFACES > 2 write_byte(ebda_seg,&EbdaData->ata.channels[2].iface,ATA_IFACE_ISA); write_word(ebda_seg,&EbdaData->ata.channels[2].iobase1,0x1e8); write_word(ebda_seg,&EbdaData->ata.channels[2].iobase2,0x3e0); write_byte(ebda_seg,&EbdaData->ata.channels[2].irq,12); #endif #if BX_MAX_ATA_INTERFACES > 3 write_byte(ebda_seg,&EbdaData->ata.channels[3].iface,ATA_IFACE_ISA); write_word(ebda_seg,&EbdaData->ata.channels[3].iobase1,0x168); write_word(ebda_seg,&EbdaData->ata.channels[3].iobase2,0x360); write_byte(ebda_seg,&EbdaData->ata.channels[3].irq,11); #endif #if BX_MAX_ATA_INTERFACES > 4 #error Please fill the ATA interface informations #endif // Device detection hdcount=cdcount=0; for(device=0; deviceata.channels[channel].iobase1); iobase2 =read_word(ebda_seg,&EbdaData->ata.channels[channel].iobase2); // Disable interrupts outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN); // Look for device outb(iobase1+ATA_CB_DH, slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0); outb(iobase1+ATA_CB_SC, 0x55); outb(iobase1+ATA_CB_SN, 0xaa); outb(iobase1+ATA_CB_SC, 0xaa); outb(iobase1+ATA_CB_SN, 0x55); outb(iobase1+ATA_CB_SC, 0x55); outb(iobase1+ATA_CB_SN, 0xaa); // If we found something sc = inb(iobase1+ATA_CB_SC); sn = inb(iobase1+ATA_CB_SN); if ( (sc == 0x55) && (sn == 0xaa) ) { write_byte(ebda_seg,&EbdaData->ata.devices[device].type,ATA_TYPE_UNKNOWN); // reset the channel ata_reset(device); // check for ATA or ATAPI outb(iobase1+ATA_CB_DH, slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0); sc = inb(iobase1+ATA_CB_SC); sn = inb(iobase1+ATA_CB_SN); if ((sc==0x01) && (sn==0x01)) { cl = inb(iobase1+ATA_CB_CL); ch = inb(iobase1+ATA_CB_CH); st = inb(iobase1+ATA_CB_STAT); if ((cl==0x14) && (ch==0xeb)) { write_byte(ebda_seg,&EbdaData->ata.devices[device].type,ATA_TYPE_ATAPI); } else if ((cl==0x00) && (ch==0x00) && (st!=0x00)) { write_byte(ebda_seg,&EbdaData->ata.devices[device].type,ATA_TYPE_ATA); } else if ((cl==0xff) && (ch==0xff)) { write_byte(ebda_seg,&EbdaData->ata.devices[device].type,ATA_TYPE_NONE); } } } type=read_byte(ebda_seg,&EbdaData->ata.devices[device].type); // Now we send a IDENTIFY command to ATA device if(type == ATA_TYPE_ATA) { Bit32u sectors_low, sectors_high; Bit16u cylinders, heads, spt, blksize; Bit8u translation, removable, mode; //Temporary values to do the transfer write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_HD); write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, ATA_MODE_PIO16); if (ata_cmd_data_in(device,ATA_CMD_IDENTIFY_DEVICE, 1, 0, 0, 0, 0L, 0L, get_SS(),buffer) !=0 ) BX_PANIC("ata-detect: Failed to detect ATA device\n"); removable = (read_byte(get_SS(),buffer+0) & 0x80) ? 1 : 0; mode = read_byte(get_SS(),buffer+96) ? ATA_MODE_PIO32 : ATA_MODE_PIO16; blksize = read_word(get_SS(),buffer+10); cylinders = read_word(get_SS(),buffer+(1*2)); // word 1 heads = read_word(get_SS(),buffer+(3*2)); // word 3 spt = read_word(get_SS(),buffer+(6*2)); // word 6 if (read_word(get_SS(),buffer+(83*2)) & (1 << 10)) { // word 83 - lba48 support sectors_low = read_dword(get_SS(),buffer+(100*2)); // word 100 and word 101 sectors_high = read_dword(get_SS(),buffer+(102*2)); // word 102 and word 103 } else { sectors_low = read_dword(get_SS(),buffer+(60*2)); // word 60 and word 61 sectors_high = 0; } write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_HD); write_byte(ebda_seg,&EbdaData->ata.devices[device].removable, removable); write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, mode); write_word(ebda_seg,&EbdaData->ata.devices[device].blksize, blksize); write_word(ebda_seg,&EbdaData->ata.devices[device].pchs.heads, heads); write_word(ebda_seg,&EbdaData->ata.devices[device].pchs.cylinders, cylinders); write_word(ebda_seg,&EbdaData->ata.devices[device].pchs.spt, spt); write_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_low, sectors_low); write_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_high, sectors_high); BX_INFO("ata%d-%d: PCHS=%u/%d/%d translation=", channel, slave,cylinders, heads, spt); translation = inb_cmos(0x39 + channel/2); for (shift=device%4; shift>0; shift--) translation >>= 2; translation &= 0x03; write_byte(ebda_seg,&EbdaData->ata.devices[device].translation, translation); switch (translation) { case ATA_TRANSLATION_NONE: BX_INFO("none"); break; case ATA_TRANSLATION_LBA: BX_INFO("lba"); break; case ATA_TRANSLATION_LARGE: BX_INFO("large"); break; case ATA_TRANSLATION_RECHS: BX_INFO("r-echs"); break; } switch (translation) { case ATA_TRANSLATION_NONE: break; case ATA_TRANSLATION_LBA: spt = 63; sectors_low /= 63; heads = sectors_low / 1024; if (heads>128) heads = 255; else if (heads>64) heads = 128; else if (heads>32) heads = 64; else if (heads>16) heads = 32; else heads=16; cylinders = sectors_low / heads; break; case ATA_TRANSLATION_RECHS: // Take care not to overflow if (heads==16) { if(cylinders>61439) cylinders=61439; heads=15; cylinders = (Bit16u)((Bit32u)(cylinders)*16/15); } // then go through the large bitshift process case ATA_TRANSLATION_LARGE: while(cylinders > 1024) { cylinders >>= 1; heads <<= 1; // If we max out the head count if (heads > 127) break; } break; } // clip to 1024 cylinders in lchs if (cylinders > 1024) cylinders=1024; BX_INFO(" LCHS=%d/%d/%d\n", cylinders, heads, spt); write_word(ebda_seg,&EbdaData->ata.devices[device].lchs.heads, heads); write_word(ebda_seg,&EbdaData->ata.devices[device].lchs.cylinders, cylinders); write_word(ebda_seg,&EbdaData->ata.devices[device].lchs.spt, spt); // fill hdidmap write_byte(ebda_seg,&EbdaData->ata.hdidmap[hdcount], device); hdcount++; } // Now we send a IDENTIFY command to ATAPI device if(type == ATA_TYPE_ATAPI) { Bit8u type, removable, mode; Bit16u blksize; //Temporary values to do the transfer write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_CDROM); write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, ATA_MODE_PIO16); if (ata_cmd_data_in(device,ATA_CMD_IDENTIFY_DEVICE_PACKET, 1, 0, 0, 0, 0L, 0L, get_SS(),buffer) != 0) BX_PANIC("ata-detect: Failed to detect ATAPI device\n"); type = read_byte(get_SS(),buffer+1) & 0x1f; removable = (read_byte(get_SS(),buffer+0) & 0x80) ? 1 : 0; mode = read_byte(get_SS(),buffer+96) ? ATA_MODE_PIO32 : ATA_MODE_PIO16; blksize = 2048; write_byte(ebda_seg,&EbdaData->ata.devices[device].device, type); write_byte(ebda_seg,&EbdaData->ata.devices[device].removable, removable); write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, mode); write_word(ebda_seg,&EbdaData->ata.devices[device].blksize, blksize); // fill cdidmap write_byte(ebda_seg,&EbdaData->ata.cdidmap[cdcount], device); cdcount++; } { Bit32u sizeinmb; Bit16u ataversion; Bit8u c, i, version, model[41]; switch (type) { case ATA_TYPE_ATA: sizeinmb = (read_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_high) << 21) | (read_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_low) >> 11); case ATA_TYPE_ATAPI: // Read ATA/ATAPI version ataversion=((Bit16u)(read_byte(get_SS(),buffer+161))<<8)|read_byte(get_SS(),buffer+160); for(version=15;version>0;version--) { if((ataversion&(1<0;i--){ if(read_byte(get_SS(),model+i)==0x20) write_byte(get_SS(),model+i,0x00); else break; } if (i>36) { write_byte(get_SS(),model+36,0x00); for(i=35;i>32;i--){ write_byte(get_SS(),model+i,0x2E); } } break; } switch (type) { case ATA_TYPE_ATA: printf("ata%d %s: ",channel,slave?" slave":"master"); i=0; while(c=read_byte(get_SS(),model+i++)) printf("%c",c); if (sizeinmb < (1UL<<16)) printf(" ATA-%d Hard-Disk (%4u MBytes)\n", version, (Bit16u)sizeinmb); else printf(" ATA-%d Hard-Disk (%4u GBytes)\n", version, (Bit16u)(sizeinmb>>10)); break; case ATA_TYPE_ATAPI: printf("ata%d %s: ",channel,slave?" slave":"master"); i=0; while(c=read_byte(get_SS(),model+i++)) printf("%c",c); if(read_byte(ebda_seg,&EbdaData->ata.devices[device].device)==ATA_DEVICE_CDROM) printf(" ATAPI-%d CD-Rom/DVD-Rom\n",version); else printf(" ATAPI-%d Device\n",version); break; case ATA_TYPE_UNKNOWN: printf("ata%d %s: Unknown device\n",channel,slave?" slave":"master"); break; } } } // Store the devices counts write_byte(ebda_seg,&EbdaData->ata.hdcount, hdcount); write_byte(ebda_seg,&EbdaData->ata.cdcount, cdcount); write_byte(0x40,0x75, hdcount); printf("\n"); // FIXME : should use bios=cmos|auto|disable bits // FIXME : should know about translation bits // FIXME : move hard_drive_post here } // --------------------------------------------------------------------------- // ATA/ATAPI driver : software reset // --------------------------------------------------------------------------- // ATA-3 // 8.2.1 Software reset - Device 0 void ata_reset(device) Bit16u device; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit16u iobase1, iobase2; Bit8u channel, slave, sn, sc; Bit8u type; Bit16u max; channel = device / 2; slave = device % 2; iobase1 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase1); iobase2 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase2); // Reset // 8.2.1 (a) -- set SRST in DC outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN | ATA_CB_DC_SRST); // 8.2.1 (b) -- wait for BSY await_ide(BSY, iobase1, 20); // 8.2.1 (f) -- clear SRST outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN); type=read_byte(ebda_seg,&EbdaData->ata.devices[device].type); if (type != ATA_TYPE_NONE) { // 8.2.1 (g) -- check for sc==sn==0x01 // select device outb(iobase1+ATA_CB_DH, slave?ATA_CB_DH_DEV1:ATA_CB_DH_DEV0); sc = inb(iobase1+ATA_CB_SC); sn = inb(iobase1+ATA_CB_SN); if ( (sc==0x01) && (sn==0x01) ) { if (type == ATA_TYPE_ATA) //ATA await_ide(NOT_BSY_RDY, iobase1, IDE_TIMEOUT); else //ATAPI await_ide(NOT_BSY, iobase1, IDE_TIMEOUT); } // 8.2.1 (h) -- wait for not BSY await_ide(NOT_BSY, iobase1, IDE_TIMEOUT); } // Enable interrupts outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15); } // --------------------------------------------------------------------------- // ATA/ATAPI driver : execute a non data command // --------------------------------------------------------------------------- Bit16u ata_cmd_non_data() {return 0;} // --------------------------------------------------------------------------- // ATA/ATAPI driver : execute a data-in command // --------------------------------------------------------------------------- // returns // 0 : no error // 1 : BUSY bit set // 2 : read error // 3 : expected DRQ=1 // 4 : no sectors left to read/verify // 5 : more sectors to read/verify // 6 : no sectors left to write // 7 : more sectors to write Bit16u ata_cmd_data_in(device, command, count, cylinder, head, sector, lba_low, lba_high, segment, offset) Bit16u device, command, count, cylinder, head, sector, segment, offset; Bit32u lba_low, lba_high; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit16u iobase1, iobase2, blksize; Bit8u channel, slave; Bit8u status, current, mode; channel = device / 2; slave = device % 2; iobase1 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase1); iobase2 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase2); mode = read_byte(ebda_seg, &EbdaData->ata.devices[device].mode); blksize = 0x200; // was = read_word(ebda_seg, &EbdaData->ata.devices[device].blksize); if (mode == ATA_MODE_PIO32) blksize>>=2; else blksize>>=1; // Reset count of transferred data write_word(ebda_seg, &EbdaData->ata.trsfsectors,0); write_dword(ebda_seg, &EbdaData->ata.trsfbytes,0L); current = 0; status = inb(iobase1 + ATA_CB_STAT); if (status & ATA_CB_STAT_BSY) return 1; outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN); // sector will be 0 only on lba access. Convert to lba-chs if (sector == 0) { if ((count >= 1 << 8) || lba_high || (lba_low + count >= 1UL << 28)) { outb(iobase1 + ATA_CB_FR, 0x00); outb(iobase1 + ATA_CB_SC, (count >> 8) & 0xff); outb(iobase1 + ATA_CB_SN, lba_low >> 24); outb(iobase1 + ATA_CB_CL, lba_high & 0xff); outb(iobase1 + ATA_CB_CH, lba_high >> 8); command |= 0x04; count &= (1UL << 8) - 1; lba_low &= (1UL << 24) - 1; } sector = (Bit16u) (lba_low & 0x000000ffL); cylinder = (Bit16u) ((lba_low>>8) & 0x0000ffffL); head = ((Bit16u) ((lba_low>>24) & 0x0000000fL)) | ATA_CB_DH_LBA; } outb(iobase1 + ATA_CB_FR, 0x00); outb(iobase1 + ATA_CB_SC, count); outb(iobase1 + ATA_CB_SN, sector); outb(iobase1 + ATA_CB_CL, cylinder & 0x00ff); outb(iobase1 + ATA_CB_CH, cylinder >> 8); outb(iobase1 + ATA_CB_DH, (slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0) | (Bit8u) head ); outb(iobase1 + ATA_CB_CMD, command); await_ide(NOT_BSY_DRQ, iobase1, IDE_TIMEOUT); status = inb(iobase1 + ATA_CB_STAT); if (status & ATA_CB_STAT_ERR) { BX_DEBUG_ATA("ata_cmd_data_in : read error\n"); return 2; } else if ( !(status & ATA_CB_STAT_DRQ) ) { BX_DEBUG_ATA("ata_cmd_data_in : DRQ not set (status %02x)\n", (unsigned) status); return 3; } // FIXME : move seg/off translation here ASM_START sti ;; enable higher priority interrupts ASM_END while (1) { ASM_START push bp mov bp, sp mov di, _ata_cmd_data_in.offset + 2[bp] mov ax, _ata_cmd_data_in.segment + 2[bp] mov cx, _ata_cmd_data_in.blksize + 2[bp] ;; adjust if there will be an overrun. 2K max sector size cmp di, #0xf800 ;; jbe ata_in_no_adjust ata_in_adjust: sub di, #0x0800 ;; sub 2 kbytes from offset add ax, #0x0080 ;; add 2 Kbytes to segment ata_in_no_adjust: mov es, ax ;; segment in es mov dx, _ata_cmd_data_in.iobase1 + 2[bp] ;; ATA data read port mov ah, _ata_cmd_data_in.mode + 2[bp] cmp ah, #ATA_MODE_PIO32 je ata_in_32 ata_in_16: rep insw ;; CX words transferred from port(DX) to ES:[DI] jmp ata_in_done ata_in_32: rep insd ;; CX dwords transferred from port(DX) to ES:[DI] ata_in_done: mov _ata_cmd_data_in.offset + 2[bp], di mov _ata_cmd_data_in.segment + 2[bp], es pop bp ASM_END current++; write_word(ebda_seg, &EbdaData->ata.trsfsectors,current); count--; await_ide(NOT_BSY, iobase1, IDE_TIMEOUT); status = inb(iobase1 + ATA_CB_STAT); if (count == 0) { if ( (status & (ATA_CB_STAT_BSY | ATA_CB_STAT_RDY | ATA_CB_STAT_DRQ | ATA_CB_STAT_ERR) ) != ATA_CB_STAT_RDY ) { BX_DEBUG_ATA("ata_cmd_data_in : no sectors left (status %02x)\n", (unsigned) status); return 4; } break; } else { if ( (status & (ATA_CB_STAT_BSY | ATA_CB_STAT_RDY | ATA_CB_STAT_DRQ | ATA_CB_STAT_ERR) ) != (ATA_CB_STAT_RDY | ATA_CB_STAT_DRQ) ) { BX_DEBUG_ATA("ata_cmd_data_in : more sectors left (status %02x)\n", (unsigned) status); return 5; } continue; } } // Enable interrupts outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15); return 0; } // --------------------------------------------------------------------------- // ATA/ATAPI driver : execute a data-out command // --------------------------------------------------------------------------- // returns // 0 : no error // 1 : BUSY bit set // 2 : read error // 3 : expected DRQ=1 // 4 : no sectors left to read/verify // 5 : more sectors to read/verify // 6 : no sectors left to write // 7 : more sectors to write Bit16u ata_cmd_data_out(device, command, count, cylinder, head, sector, lba_low, lba_high, segment, offset) Bit16u device, command, count, cylinder, head, sector, segment, offset; Bit32u lba_low, lba_high; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit16u iobase1, iobase2, blksize; Bit8u channel, slave; Bit8u status, current, mode; channel = device / 2; slave = device % 2; iobase1 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase1); iobase2 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase2); mode = read_byte(ebda_seg, &EbdaData->ata.devices[device].mode); blksize = 0x200; // was = read_word(ebda_seg, &EbdaData->ata.devices[device].blksize); if (mode == ATA_MODE_PIO32) blksize>>=2; else blksize>>=1; // Reset count of transferred data write_word(ebda_seg, &EbdaData->ata.trsfsectors,0); write_dword(ebda_seg, &EbdaData->ata.trsfbytes,0L); current = 0; status = inb(iobase1 + ATA_CB_STAT); if (status & ATA_CB_STAT_BSY) return 1; outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN); // sector will be 0 only on lba access. Convert to lba-chs if (sector == 0) { if ((count >= 1 << 8) || lba_high || (lba_low + count >= 1UL << 28)) { outb(iobase1 + ATA_CB_FR, 0x00); outb(iobase1 + ATA_CB_SC, (count >> 8) & 0xff); outb(iobase1 + ATA_CB_SN, lba_low >> 24); outb(iobase1 + ATA_CB_CL, lba_high & 0xff); outb(iobase1 + ATA_CB_CH, lba_high >> 8); command |= 0x04; count &= (1UL << 8) - 1; lba_low &= (1UL << 24) - 1; } sector = (Bit16u) (lba_low & 0x000000ffL); cylinder = (Bit16u) ((lba_low>>8) & 0x0000ffffL); head = ((Bit16u) ((lba_low>>24) & 0x0000000fL)) | ATA_CB_DH_LBA; } outb(iobase1 + ATA_CB_FR, 0x00); outb(iobase1 + ATA_CB_SC, count); outb(iobase1 + ATA_CB_SN, sector); outb(iobase1 + ATA_CB_CL, cylinder & 0x00ff); outb(iobase1 + ATA_CB_CH, cylinder >> 8); outb(iobase1 + ATA_CB_DH, (slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0) | (Bit8u) head ); outb(iobase1 + ATA_CB_CMD, command); await_ide(NOT_BSY_DRQ, iobase1, IDE_TIMEOUT); status = inb(iobase1 + ATA_CB_STAT); if (status & ATA_CB_STAT_ERR) { BX_DEBUG_ATA("ata_cmd_data_out : read error\n"); return 2; } else if ( !(status & ATA_CB_STAT_DRQ) ) { BX_DEBUG_ATA("ata_cmd_data_out : DRQ not set (status %02x)\n", (unsigned) status); return 3; } // FIXME : move seg/off translation here ASM_START sti ;; enable higher priority interrupts ASM_END while (1) { ASM_START push bp mov bp, sp mov si, _ata_cmd_data_out.offset + 2[bp] mov ax, _ata_cmd_data_out.segment + 2[bp] mov cx, _ata_cmd_data_out.blksize + 2[bp] ;; adjust if there will be an overrun. 2K max sector size cmp si, #0xf800 ;; jbe ata_out_no_adjust ata_out_adjust: sub si, #0x0800 ;; sub 2 kbytes from offset add ax, #0x0080 ;; add 2 Kbytes to segment ata_out_no_adjust: mov es, ax ;; segment in es mov dx, _ata_cmd_data_out.iobase1 + 2[bp] ;; ATA data write port mov ah, _ata_cmd_data_out.mode + 2[bp] cmp ah, #ATA_MODE_PIO32 je ata_out_32 ata_out_16: seg ES rep outsw ;; CX words transferred from port(DX) to ES:[SI] jmp ata_out_done ata_out_32: seg ES rep outsd ;; CX dwords transferred from port(DX) to ES:[SI] ata_out_done: mov _ata_cmd_data_out.offset + 2[bp], si mov _ata_cmd_data_out.segment + 2[bp], es pop bp ASM_END current++; write_word(ebda_seg, &EbdaData->ata.trsfsectors,current); count--; status = inb(iobase1 + ATA_CB_STAT); if (count == 0) { if ( (status & (ATA_CB_STAT_BSY | ATA_CB_STAT_RDY | ATA_CB_STAT_DF | ATA_CB_STAT_DRQ | ATA_CB_STAT_ERR) ) != ATA_CB_STAT_RDY ) { BX_DEBUG_ATA("ata_cmd_data_out : no sectors left (status %02x)\n", (unsigned) status); return 6; } break; } else { if ( (status & (ATA_CB_STAT_BSY | ATA_CB_STAT_RDY | ATA_CB_STAT_DRQ | ATA_CB_STAT_ERR) ) != (ATA_CB_STAT_RDY | ATA_CB_STAT_DRQ) ) { BX_DEBUG_ATA("ata_cmd_data_out : more sectors left (status %02x)\n", (unsigned) status); return 7; } continue; } } // Enable interrupts outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15); return 0; } // --------------------------------------------------------------------------- // ATA/ATAPI driver : execute a packet command // --------------------------------------------------------------------------- // returns // 0 : no error // 1 : error in parameters // 2 : BUSY bit set // 3 : error // 4 : not ready Bit16u ata_cmd_packet(device, cmdlen, cmdseg, cmdoff, header, length, inout, bufseg, bufoff) Bit8u cmdlen,inout; Bit16u device,cmdseg, cmdoff, bufseg, bufoff; Bit16u header; Bit32u length; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit16u iobase1, iobase2; Bit16u lcount, lbefore, lafter, count; Bit8u channel, slave; Bit8u status, mode, lmode; Bit32u total, transfer; channel = device / 2; slave = device % 2; // Data out is not supported yet if (inout == ATA_DATA_OUT) { BX_INFO("ata_cmd_packet: DATA_OUT not supported yet\n"); return 1; } // The header length must be even if (header & 1) { BX_DEBUG_ATA("ata_cmd_packet : header must be even (%04x)\n",header); return 1; } iobase1 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase1); iobase2 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase2); mode = read_byte(ebda_seg, &EbdaData->ata.devices[device].mode); transfer= 0L; if (cmdlen < 12) cmdlen=12; if (cmdlen > 12) cmdlen=16; cmdlen>>=1; // Reset count of transferred data write_word(ebda_seg, &EbdaData->ata.trsfsectors,0); write_dword(ebda_seg, &EbdaData->ata.trsfbytes,0L); status = inb(iobase1 + ATA_CB_STAT); if (status & ATA_CB_STAT_BSY) return 2; outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN); outb(iobase1 + ATA_CB_FR, 0x00); outb(iobase1 + ATA_CB_SC, 0x00); outb(iobase1 + ATA_CB_SN, 0x00); outb(iobase1 + ATA_CB_CL, 0xfff0 & 0x00ff); outb(iobase1 + ATA_CB_CH, 0xfff0 >> 8); outb(iobase1 + ATA_CB_DH, slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0); outb(iobase1 + ATA_CB_CMD, ATA_CMD_PACKET); // Device should ok to receive command await_ide(NOT_BSY_DRQ, iobase1, IDE_TIMEOUT); status = inb(iobase1 + ATA_CB_STAT); if (status & ATA_CB_STAT_ERR) { BX_DEBUG_ATA("ata_cmd_packet : error, status is %02x\n",status); return 3; } else if ( !(status & ATA_CB_STAT_DRQ) ) { BX_DEBUG_ATA("ata_cmd_packet : DRQ not set (status %02x)\n", (unsigned) status); return 4; } // Normalize address cmdseg += (cmdoff / 16); cmdoff %= 16; // Send command to device ASM_START sti ;; enable higher priority interrupts push bp mov bp, sp mov si, _ata_cmd_packet.cmdoff + 2[bp] mov ax, _ata_cmd_packet.cmdseg + 2[bp] mov cx, _ata_cmd_packet.cmdlen + 2[bp] mov es, ax ;; segment in es mov dx, _ata_cmd_packet.iobase1 + 2[bp] ;; ATA data write port seg ES rep outsw ;; CX words transferred from port(DX) to ES:[SI] pop bp ASM_END if (inout == ATA_DATA_NO) { await_ide(NOT_BSY, iobase1, IDE_TIMEOUT); status = inb(iobase1 + ATA_CB_STAT); } else { Bit16u loops = 0; Bit8u sc; while (1) { if (loops == 0) {//first time through status = inb(iobase2 + ATA_CB_ASTAT); await_ide(NOT_BSY_DRQ, iobase1, IDE_TIMEOUT); } else await_ide(NOT_BSY, iobase1, IDE_TIMEOUT); loops++; status = inb(iobase1 + ATA_CB_STAT); sc = inb(iobase1 + ATA_CB_SC); // Check if command completed if(((inb(iobase1 + ATA_CB_SC)&0x7)==0x3) && ((status & (ATA_CB_STAT_RDY | ATA_CB_STAT_ERR)) == ATA_CB_STAT_RDY)) break; if (status & ATA_CB_STAT_ERR) { BX_DEBUG_ATA("ata_cmd_packet : error (status %02x)\n",status); return 3; } // Normalize address bufseg += (bufoff / 16); bufoff %= 16; // Get the byte count lcount = ((Bit16u)(inb(iobase1 + ATA_CB_CH))<<8)+inb(iobase1 + ATA_CB_CL); // adjust to read what we want if(header>lcount) { lbefore=lcount; header-=lcount; lcount=0; } else { lbefore=header; header=0; lcount-=lbefore; } if(lcount>length) { lafter=lcount-length; lcount=length; length=0; } else { lafter=0; length-=lcount; } // Save byte count count = lcount; BX_DEBUG_ATA("Trying to read %04x bytes (%04x %04x %04x) ",lbefore+lcount+lafter,lbefore,lcount,lafter); BX_DEBUG_ATA("to 0x%04x:0x%04x\n",bufseg,bufoff); // If counts not dividable by 4, use 16bits mode lmode = mode; if (lbefore & 0x03) lmode=ATA_MODE_PIO16; if (lcount & 0x03) lmode=ATA_MODE_PIO16; if (lafter & 0x03) lmode=ATA_MODE_PIO16; // adds an extra byte if count are odd. before is always even if (lcount & 0x01) { lcount+=1; if ((lafter > 0) && (lafter & 0x01)) { lafter-=1; } } if (lmode == ATA_MODE_PIO32) { lcount>>=2; lbefore>>=2; lafter>>=2; } else { lcount>>=1; lbefore>>=1; lafter>>=1; } ; // FIXME bcc bug ASM_START push bp mov bp, sp mov dx, _ata_cmd_packet.iobase1 + 2[bp] ;; ATA data read port mov cx, _ata_cmd_packet.lbefore + 2[bp] jcxz ata_packet_no_before mov ah, _ata_cmd_packet.lmode + 2[bp] cmp ah, #ATA_MODE_PIO32 je ata_packet_in_before_32 ata_packet_in_before_16: in ax, dx loop ata_packet_in_before_16 jmp ata_packet_no_before ata_packet_in_before_32: push eax ata_packet_in_before_32_loop: in eax, dx loop ata_packet_in_before_32_loop pop eax ata_packet_no_before: mov cx, _ata_cmd_packet.lcount + 2[bp] jcxz ata_packet_after mov di, _ata_cmd_packet.bufoff + 2[bp] mov ax, _ata_cmd_packet.bufseg + 2[bp] mov es, ax mov ah, _ata_cmd_packet.lmode + 2[bp] cmp ah, #ATA_MODE_PIO32 je ata_packet_in_32 ata_packet_in_16: rep insw ;; CX words transferred to port(DX) to ES:[DI] jmp ata_packet_after ata_packet_in_32: rep insd ;; CX dwords transferred to port(DX) to ES:[DI] ata_packet_after: mov cx, _ata_cmd_packet.lafter + 2[bp] jcxz ata_packet_done mov ah, _ata_cmd_packet.lmode + 2[bp] cmp ah, #ATA_MODE_PIO32 je ata_packet_in_after_32 ata_packet_in_after_16: in ax, dx loop ata_packet_in_after_16 jmp ata_packet_done ata_packet_in_after_32: push eax ata_packet_in_after_32_loop: in eax, dx loop ata_packet_in_after_32_loop pop eax ata_packet_done: pop bp ASM_END // Compute new buffer address bufoff += count; // Save transferred bytes count transfer += count; write_dword(ebda_seg, &EbdaData->ata.trsfbytes,transfer); } } // Final check, device must be ready if ( (status & (ATA_CB_STAT_BSY | ATA_CB_STAT_RDY | ATA_CB_STAT_DF | ATA_CB_STAT_DRQ | ATA_CB_STAT_ERR) ) != ATA_CB_STAT_RDY ) { BX_DEBUG_ATA("ata_cmd_packet : not ready (status %02x)\n", (unsigned) status); return 4; } // Enable interrupts outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15); return 0; } // --------------------------------------------------------------------------- // End of ATA/ATAPI Driver // --------------------------------------------------------------------------- // --------------------------------------------------------------------------- // Start of ATA/ATAPI generic functions // --------------------------------------------------------------------------- Bit16u atapi_get_sense(device, seg, asc, ascq) Bit16u device; { Bit8u atacmd[12]; Bit8u buffer[18]; Bit8u i; memsetb(get_SS(),atacmd,0,12); // Request SENSE atacmd[0]=ATA_CMD_REQUEST_SENSE; atacmd[4]=sizeof(buffer); if (ata_cmd_packet(device, 12, get_SS(), atacmd, 0, 18L, ATA_DATA_IN, get_SS(), buffer) != 0) return 0x0002; write_byte(seg,asc,buffer[12]); write_byte(seg,ascq,buffer[13]); return 0; } Bit16u atapi_is_ready(device) Bit16u device; { Bit8u packet[12]; Bit8u buf[8]; Bit32u block_len; Bit32u sectors; Bit32u timeout; //measured in ms Bit32u time; Bit8u asc, ascq; Bit8u in_progress; Bit16u ebda_seg = read_word(0x0040,0x000E); if (read_byte(ebda_seg,&EbdaData->ata.devices[device].type) != ATA_TYPE_ATAPI) { printf("not implemented for non-ATAPI device\n"); return -1; } BX_DEBUG_ATA("ata_detect_medium: begin\n"); memsetb(get_SS(),packet, 0, sizeof packet); packet[0] = 0x25; /* READ CAPACITY */ /* Retry READ CAPACITY 50 times unless MEDIUM NOT PRESENT * is reported by the device. If the device reports "IN PROGRESS", * 30 seconds is added. */ timeout = 5000; time = 0; in_progress = 0; while (time < timeout) { if (ata_cmd_packet(device, sizeof(packet), get_SS(), packet, 0, 8L, ATA_DATA_IN, get_SS(), buf) == 0) goto ok; if (atapi_get_sense(device, get_SS(), &asc, &ascq) == 0) { if (asc == 0x3a) { /* MEDIUM NOT PRESENT */ BX_DEBUG_ATA("Device reports MEDIUM NOT PRESENT\n"); return -1; } if (asc == 0x04 && ascq == 0x01 && !in_progress) { /* IN PROGRESS OF BECOMING READY */ printf("Waiting for device to detect medium... "); /* Allow 30 seconds more */ timeout = 30000; in_progress = 1; } } time += 100; } BX_DEBUG_ATA("read capacity failed\n"); return -1; ok: block_len = (Bit32u) buf[4] << 24 | (Bit32u) buf[5] << 16 | (Bit32u) buf[6] << 8 | (Bit32u) buf[7] << 0; BX_DEBUG_ATA("block_len=%u\n", block_len); if (block_len!= 2048 && block_len!= 512) { printf("Unsupported sector size %u\n", block_len); return -1; } write_dword(ebda_seg,&EbdaData->ata.devices[device].blksize, block_len); sectors = (Bit32u) buf[0] << 24 | (Bit32u) buf[1] << 16 | (Bit32u) buf[2] << 8 | (Bit32u) buf[3] << 0; BX_DEBUG_ATA("sectors=%u\n", sectors); if (block_len == 2048) sectors <<= 2; /* # of sectors in 512-byte "soft" sector */ if (sectors != read_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_low)) printf("%dMB medium detected\n", sectors>>(20-9)); write_dword(ebda_seg,&EbdaData->ata.devices[device].sectors_low, sectors); return 0; } Bit16u atapi_is_cdrom(device) Bit8u device; { Bit16u ebda_seg=read_word(0x0040,0x000E); if (device >= BX_MAX_ATA_DEVICES) return 0; if (read_byte(ebda_seg,&EbdaData->ata.devices[device].type) != ATA_TYPE_ATAPI) return 0; if (read_byte(ebda_seg,&EbdaData->ata.devices[device].device) != ATA_DEVICE_CDROM) return 0; return 1; } // --------------------------------------------------------------------------- // End of ATA/ATAPI generic functions // --------------------------------------------------------------------------- #endif // BX_USE_ATADRV #if BX_ELTORITO_BOOT // --------------------------------------------------------------------------- // Start of El-Torito boot functions // --------------------------------------------------------------------------- void cdemu_init() { Bit16u ebda_seg=read_word(0x0040,0x000E); // the only important data is this one for now write_byte(ebda_seg,&EbdaData->cdemu.active,0x00); } Bit8u cdemu_isactive() { Bit16u ebda_seg=read_word(0x0040,0x000E); return(read_byte(ebda_seg,&EbdaData->cdemu.active)); } Bit8u cdemu_emulated_drive() { Bit16u ebda_seg=read_word(0x0040,0x000E); return(read_byte(ebda_seg,&EbdaData->cdemu.emulated_drive)); } static char isotag[6]="CD001"; static char eltorito[24]="EL TORITO SPECIFICATION"; // // Returns ah: emulated drive, al: error code // Bit16u cdrom_boot() { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u atacmd[12], buffer[2048]; Bit32u lba; Bit16u boot_segment, nbsectors, i, error; Bit8u device; // Find out the first cdrom for (device=0; device= BX_MAX_ATA_DEVICES) return 2; if(error = atapi_is_ready(device) != 0) BX_INFO("ata_is_ready returned %d\n",error); // Read the Boot Record Volume Descriptor memsetb(get_SS(),atacmd,0,12); atacmd[0]=0x28; // READ command atacmd[7]=(0x01 & 0xff00) >> 8; // Sectors atacmd[8]=(0x01 & 0x00ff); // Sectors atacmd[2]=(0x11 & 0xff000000) >> 24; // LBA atacmd[3]=(0x11 & 0x00ff0000) >> 16; atacmd[4]=(0x11 & 0x0000ff00) >> 8; atacmd[5]=(0x11 & 0x000000ff); if((error = ata_cmd_packet(device, 12, get_SS(), atacmd, 0, 2048L, ATA_DATA_IN, get_SS(), buffer)) != 0) return 3; // Validity checks if(buffer[0]!=0) return 4; for(i=0;i<5;i++){ if(buffer[1+i]!=read_byte(0xf000,&isotag[i])) return 5; } for(i=0;i<23;i++) if(buffer[7+i]!=read_byte(0xf000,&eltorito[i])) return 6; // ok, now we calculate the Boot catalog address lba=buffer[0x4A]*0x1000000+buffer[0x49]*0x10000+buffer[0x48]*0x100+buffer[0x47]; // And we read the Boot Catalog memsetb(get_SS(),atacmd,0,12); atacmd[0]=0x28; // READ command atacmd[7]=(0x01 & 0xff00) >> 8; // Sectors atacmd[8]=(0x01 & 0x00ff); // Sectors atacmd[2]=(lba & 0xff000000) >> 24; // LBA atacmd[3]=(lba & 0x00ff0000) >> 16; atacmd[4]=(lba & 0x0000ff00) >> 8; atacmd[5]=(lba & 0x000000ff); if((error = ata_cmd_packet(device, 12, get_SS(), atacmd, 0, 2048L, ATA_DATA_IN, get_SS(), buffer)) != 0) return 7; // Validation entry if(buffer[0x00]!=0x01)return 8; // Header if(buffer[0x01]!=0x00)return 9; // Platform if(buffer[0x1E]!=0x55)return 10; // key 1 if(buffer[0x1F]!=0xAA)return 10; // key 2 // Initial/Default Entry if(buffer[0x20]!=0x88)return 11; // Bootable write_byte(ebda_seg,&EbdaData->cdemu.media,buffer[0x21]); if(buffer[0x21]==0){ // FIXME ElTorito Hardcoded. cdrom is hardcoded as device 0xE0. // Win2000 cd boot needs to know it booted from cd write_byte(ebda_seg,&EbdaData->cdemu.emulated_drive,0xE0); } else if(buffer[0x21]<4) write_byte(ebda_seg,&EbdaData->cdemu.emulated_drive,0x00); else write_byte(ebda_seg,&EbdaData->cdemu.emulated_drive,0x80); write_byte(ebda_seg,&EbdaData->cdemu.controller_index,device/2); write_byte(ebda_seg,&EbdaData->cdemu.device_spec,device%2); boot_segment=buffer[0x23]*0x100+buffer[0x22]; if(boot_segment==0x0000)boot_segment=0x07C0; write_word(ebda_seg,&EbdaData->cdemu.load_segment,boot_segment); write_word(ebda_seg,&EbdaData->cdemu.buffer_segment,0x0000); nbsectors=buffer[0x27]*0x100+buffer[0x26]; write_word(ebda_seg,&EbdaData->cdemu.sector_count,nbsectors); lba=buffer[0x2B]*0x1000000+buffer[0x2A]*0x10000+buffer[0x29]*0x100+buffer[0x28]; write_dword(ebda_seg,&EbdaData->cdemu.ilba,lba); // And we read the image in memory memsetb(get_SS(),atacmd,0,12); atacmd[0]=0x28; // READ command atacmd[7]=((1+(nbsectors-1)/4) & 0xff00) >> 8; // Sectors atacmd[8]=((1+(nbsectors-1)/4) & 0x00ff); // Sectors atacmd[2]=(lba & 0xff000000) >> 24; // LBA atacmd[3]=(lba & 0x00ff0000) >> 16; atacmd[4]=(lba & 0x0000ff00) >> 8; atacmd[5]=(lba & 0x000000ff); if((error = ata_cmd_packet(device, 12, get_SS(), atacmd, 0, nbsectors*512L, ATA_DATA_IN, boot_segment,0)) != 0) return 12; // Remember the media type switch(read_byte(ebda_seg,&EbdaData->cdemu.media)) { case 0x01: // 1.2M floppy write_word(ebda_seg,&EbdaData->cdemu.vdevice.spt,15); write_word(ebda_seg,&EbdaData->cdemu.vdevice.cylinders,80); write_word(ebda_seg,&EbdaData->cdemu.vdevice.heads,2); break; case 0x02: // 1.44M floppy write_word(ebda_seg,&EbdaData->cdemu.vdevice.spt,18); write_word(ebda_seg,&EbdaData->cdemu.vdevice.cylinders,80); write_word(ebda_seg,&EbdaData->cdemu.vdevice.heads,2); break; case 0x03: // 2.88M floppy write_word(ebda_seg,&EbdaData->cdemu.vdevice.spt,36); write_word(ebda_seg,&EbdaData->cdemu.vdevice.cylinders,80); write_word(ebda_seg,&EbdaData->cdemu.vdevice.heads,2); break; case 0x04: // Harddrive write_word(ebda_seg,&EbdaData->cdemu.vdevice.spt,read_byte(boot_segment,446+6)&0x3f); write_word(ebda_seg,&EbdaData->cdemu.vdevice.cylinders, (read_byte(boot_segment,446+6)<<2) + read_byte(boot_segment,446+7) + 1); write_word(ebda_seg,&EbdaData->cdemu.vdevice.heads,read_byte(boot_segment,446+5) + 1); break; } if(read_byte(ebda_seg,&EbdaData->cdemu.media)!=0) { // Increase bios installed hardware number of devices if(read_byte(ebda_seg,&EbdaData->cdemu.emulated_drive)==0x00) write_byte(0x40,0x10,read_byte(0x40,0x10)|0x41); else write_byte(ebda_seg, &EbdaData->ata.hdcount, read_byte(ebda_seg, &EbdaData->ata.hdcount) + 1); } // everything is ok, so from now on, the emulation is active if(read_byte(ebda_seg,&EbdaData->cdemu.media)!=0) write_byte(ebda_seg,&EbdaData->cdemu.active,0x01); // return the boot drive + no error return (read_byte(ebda_seg,&EbdaData->cdemu.emulated_drive)*0x100)+0; } // --------------------------------------------------------------------------- // End of El-Torito boot functions // --------------------------------------------------------------------------- #endif // BX_ELTORITO_BOOT void int14_function(regs, ds, iret_addr) pusha_regs_t regs; // regs pushed from PUSHA instruction Bit16u ds; // previous DS:, DS set to 0x0000 by asm wrapper iret_addr_t iret_addr; // CS,IP,Flags pushed from original INT call { Bit16u addr,timer,val16; Bit8u counter; ASM_START sti ASM_END addr = read_word(0x0040, (regs.u.r16.dx << 1)); counter = read_byte(0x0040, 0x007C + regs.u.r16.dx); if ((regs.u.r16.dx < 4) && (addr > 0)) { switch (regs.u.r8.ah) { case 0: outb(addr+3, inb(addr+3) | 0x80); if (regs.u.r8.al & 0xE0 == 0) { outb(addr, 0x17); outb(addr+1, 0x04); } else { val16 = 0x600 >> ((regs.u.r8.al & 0xE0) >> 5); outb(addr, val16 & 0xFF); outb(addr+1, val16 >> 8); } outb(addr+3, regs.u.r8.al & 0x1F); regs.u.r8.ah = inb(addr+5); regs.u.r8.al = inb(addr+6); ClearCF(iret_addr.flags); break; case 1: timer = read_word(0x0040, 0x006C); while (((inb(addr+5) & 0x60) != 0x60) && (counter)) { val16 = read_word(0x0040, 0x006C); if (val16 != timer) { timer = val16; counter--; } } if (counter > 0) { outb(addr, regs.u.r8.al); regs.u.r8.ah = inb(addr+5); } else { regs.u.r8.ah = 0x80; } ClearCF(iret_addr.flags); break; case 2: timer = read_word(0x0040, 0x006C); while (((inb(addr+5) & 0x01) == 0) && (counter)) { val16 = read_word(0x0040, 0x006C); if (val16 != timer) { timer = val16; counter--; } } if (counter > 0) { regs.u.r8.ah = inb(addr+5); regs.u.r8.al = inb(addr); } else { regs.u.r8.ah = 0x80; } ClearCF(iret_addr.flags); break; case 3: regs.u.r8.ah = inb(addr+5); regs.u.r8.al = inb(addr+6); ClearCF(iret_addr.flags); break; default: SetCF(iret_addr.flags); // Unsupported } } else { SetCF(iret_addr.flags); // Unsupported } } void int15_function(regs, ES, DS, FLAGS) pusha_regs_t regs; // REGS pushed via pusha Bit16u ES, DS, FLAGS; { Bit16u ebda_seg=read_word(0x0040,0x000E); bx_bool prev_a20_enable; Bit16u base15_00; Bit8u base23_16; Bit16u ss; Bit16u BX,CX,DX; Bit16u bRegister; Bit8u irqDisable; BX_DEBUG_INT15("int15 AX=%04x\n",regs.u.r16.ax); switch (regs.u.r8.ah) { case 0x24: /* A20 Control */ switch (regs.u.r8.al) { case 0x00: set_enable_a20(0); CLEAR_CF(); regs.u.r8.ah = 0; break; case 0x01: set_enable_a20(1); CLEAR_CF(); regs.u.r8.ah = 0; break; case 0x02: regs.u.r8.al = (inb(PORT_A20) >> 1) & 0x01; CLEAR_CF(); regs.u.r8.ah = 0; break; case 0x03: CLEAR_CF(); regs.u.r8.ah = 0; regs.u.r16.bx = 3; break; default: BX_INFO("int15: Func 24h, subfunc %02xh, A20 gate control not supported\n", (unsigned) regs.u.r8.al); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } break; case 0x41: SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; break; case 0x4f: /* keyboard intercept */ // nop SET_CF(); break; case 0x52: // removable media eject CLEAR_CF(); regs.u.r8.ah = 0; // "ok ejection may proceed" break; case 0x83: { if( regs.u.r8.al == 0 ) { // Set Interval requested. if( ( read_byte( 0x40, 0xA0 ) & 1 ) == 0 ) { // Interval not already set. write_byte( 0x40, 0xA0, 1 ); // Set status byte. write_word( 0x40, 0x98, ES ); // Byte location, segment write_word( 0x40, 0x9A, regs.u.r16.bx ); // Byte location, offset write_word( 0x40, 0x9C, regs.u.r16.dx ); // Low word, delay write_word( 0x40, 0x9E, regs.u.r16.cx ); // High word, delay. CLEAR_CF( ); irqDisable = inb( PORT_PIC2_DATA ); outb( PORT_PIC2_DATA, irqDisable & 0xFE ); bRegister = inb_cmos( 0xB ); // Unmask IRQ8 so INT70 will get through. outb_cmos( 0xB, bRegister | 0x40 ); // Turn on the Periodic Interrupt timer } else { // Interval already set. BX_DEBUG_INT15("int15: Func 83h, failed, already waiting.\n" ); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } } else if( regs.u.r8.al == 1 ) { // Clear Interval requested write_byte( 0x40, 0xA0, 0 ); // Clear status byte CLEAR_CF( ); bRegister = inb_cmos( 0xB ); outb_cmos( 0xB, bRegister & ~0x40 ); // Turn off the Periodic Interrupt timer } else { BX_DEBUG_INT15("int15: Func 83h, failed.\n" ); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; regs.u.r8.al--; } break; } case 0x87: // +++ should probably have descriptor checks // +++ should have exception handlers // turn off interrupts ASM_START cli ASM_END prev_a20_enable = set_enable_a20(1); // enable A20 line // 128K max of transfer on 386+ ??? // source == destination ??? // ES:SI points to descriptor table // offset use initially comments // ============================================== // 00..07 Unused zeros Null descriptor // 08..0f GDT zeros filled in by BIOS // 10..17 source ssssssss source of data // 18..1f dest dddddddd destination of data // 20..27 CS zeros filled in by BIOS // 28..2f SS zeros filled in by BIOS //es:si //eeee0 //0ssss //----- // check for access rights of source & dest here // Initialize GDT descriptor base15_00 = (ES << 4) + regs.u.r16.si; base23_16 = ES >> 12; if (base15_00 < (ES<<4)) base23_16++; write_word(ES, regs.u.r16.si+0x08+0, 47); // limit 15:00 = 6 * 8bytes/descriptor write_word(ES, regs.u.r16.si+0x08+2, base15_00);// base 15:00 write_byte(ES, regs.u.r16.si+0x08+4, base23_16);// base 23:16 write_byte(ES, regs.u.r16.si+0x08+5, 0x93); // access write_word(ES, regs.u.r16.si+0x08+6, 0x0000); // base 31:24/reserved/limit 19:16 // Initialize CS descriptor write_word(ES, regs.u.r16.si+0x20+0, 0xffff);// limit 15:00 = normal 64K limit write_word(ES, regs.u.r16.si+0x20+2, 0x0000);// base 15:00 write_byte(ES, regs.u.r16.si+0x20+4, 0x000f);// base 23:16 write_byte(ES, regs.u.r16.si+0x20+5, 0x9b); // access write_word(ES, regs.u.r16.si+0x20+6, 0x0000);// base 31:24/reserved/limit 19:16 // Initialize SS descriptor ss = get_SS(); base15_00 = ss << 4; base23_16 = ss >> 12; write_word(ES, regs.u.r16.si+0x28+0, 0xffff); // limit 15:00 = normal 64K limit write_word(ES, regs.u.r16.si+0x28+2, base15_00);// base 15:00 write_byte(ES, regs.u.r16.si+0x28+4, base23_16);// base 23:16 write_byte(ES, regs.u.r16.si+0x28+5, 0x93); // access write_word(ES, regs.u.r16.si+0x28+6, 0x0000); // base 31:24/reserved/limit 19:16 CX = regs.u.r16.cx; ASM_START // Compile generates locals offset info relative to SP. // Get CX (word count) from stack. mov bx, sp SEG SS mov cx, _int15_function.CX [bx] // since we need to set SS:SP, save them to the BDA // for future restore push eax xor eax, eax mov ds, ax mov 0x0469, ss mov 0x0467, sp SEG ES lgdt [si + 0x08] SEG CS lidt [pmode_IDT_info] ;; perhaps do something with IDT here ;; set PE bit in CR0 mov eax, cr0 or al, #0x01 mov cr0, eax ;; far jump to flush CPU queue after transition to protected mode JMP_AP(0x0020, protected_mode) protected_mode: ;; GDT points to valid descriptor table, now load SS, DS, ES mov ax, #0x28 ;; 101 000 = 5th descriptor in table, TI=GDT, RPL=00 mov ss, ax mov ax, #0x10 ;; 010 000 = 2nd descriptor in table, TI=GDT, RPL=00 mov ds, ax mov ax, #0x18 ;; 011 000 = 3rd descriptor in table, TI=GDT, RPL=00 mov es, ax xor si, si xor di, di cld rep movsw ;; move CX words from DS:SI to ES:DI ;; make sure DS and ES limits are 64KB mov ax, #0x28 mov ds, ax mov es, ax ;; reset PG bit in CR0 ??? mov eax, cr0 and al, #0xFE mov cr0, eax ;; far jump to flush CPU queue after transition to real mode JMP_AP(0xf000, real_mode) real_mode: ;; restore IDT to normal real-mode defaults SEG CS lidt [rmode_IDT_info] // restore SS:SP from the BDA xor ax, ax mov ds, ax mov ss, 0x0469 mov sp, 0x0467 pop eax ASM_END set_enable_a20(prev_a20_enable); // turn back on interrupts ASM_START sti ASM_END regs.u.r8.ah = 0; CLEAR_CF(); break; case 0x88: // Get the amount of extended memory (above 1M) regs.u.r8.al = inb_cmos(0x30); regs.u.r8.ah = inb_cmos(0x31); // According to Ralf Brown's interrupt the limit should be 15M, // but real machines mostly return max. 63M. if(regs.u.r16.ax > 0xffc0) regs.u.r16.ax = 0xffc0; CLEAR_CF(); break; case 0x89: // Switch to Protected Mode. // ES:DI points to user-supplied GDT // BH/BL contains starting interrupt numbers for PIC0/PIC1 // This subfunction does not return! // turn off interrupts ASM_START cli ASM_END set_enable_a20(1); // enable A20 line; we're supposed to fail if that fails // Initialize CS descriptor for BIOS write_word(ES, regs.u.r16.si+0x38+0, 0xffff);// limit 15:00 = normal 64K limit write_word(ES, regs.u.r16.si+0x38+2, 0x0000);// base 15:00 write_byte(ES, regs.u.r16.si+0x38+4, 0x000f);// base 23:16 (hardcoded to f000:0000) write_byte(ES, regs.u.r16.si+0x38+5, 0x9b); // access write_word(ES, regs.u.r16.si+0x38+6, 0x0000);// base 31:24/reserved/limit 19:16 BX = regs.u.r16.bx; ASM_START // Compiler generates locals offset info relative to SP. // Get BX (PIC offsets) from stack. mov bx, sp SEG SS mov bx, _int15_function.BX [bx] // Program PICs mov al, #0x11 ; send initialisation commands out PORT_PIC1_CMD, al out PORT_PIC2_CMD, al mov al, bh out PORT_PIC1_DATA, al mov al, bl out PORT_PIC2_DATA, al mov al, #0x04 out PORT_PIC1_DATA, al mov al, #0x02 out PORT_PIC2_DATA, al mov al, #0x01 out PORT_PIC1_DATA, al out PORT_PIC2_DATA, al mov al, #0xff ; mask all IRQs, user must re-enable out PORT_PIC1_DATA, al out PORT_PIC2_DATA, al // Load GDT and IDT from supplied data SEG ES lgdt [si + 0x08] SEG ES lidt [si + 0x10] // set PE bit in CR0 mov eax, cr0 or al, #0x01 mov cr0, eax // far jump to flush CPU queue after transition to protected mode JMP_AP(0x0038, protmode_switch) protmode_switch: ;; GDT points to valid descriptor table, now load SS, DS, ES mov ax, #0x28 mov ss, ax mov ax, #0x18 mov ds, ax mov ax, #0x20 mov es, ax // unwind the stack - this will break if calling sequence changes! mov sp,bp add sp,#4 ; skip return address popa ; restore regs pop ax ; skip saved es pop ax ; skip saved ds pop ax ; skip saved flags // return to caller - note that we do not use IRET because // we cannot enable interrupts pop cx ; get return offset pop ax ; skip return segment pop ax ; skip flags mov ax, #0x30 ; ah must be 0 on successful exit push ax push cx ; re-create modified ret address on stack retf ASM_END break; case 0x90: /* Device busy interrupt. Called by Int 16h when no key available */ break; case 0x91: /* Interrupt complete. Called by Int 16h when key becomes available */ break; case 0xbf: BX_INFO("*** int 15h function AH=bf not yet supported!\n"); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; break; case 0xC0: #if 0 SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; break; #endif CLEAR_CF(); regs.u.r8.ah = 0; regs.u.r16.bx = BIOS_CONFIG_TABLE; ES = 0xF000; break; case 0xc1: ES = ebda_seg; CLEAR_CF(); break; case 0xd8: bios_printf(BIOS_PRINTF_DEBUG, "EISA BIOS not present\n"); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; break; default: BX_INFO("*** int 15h function AX=%04x, BX=%04x not yet supported!\n", (unsigned) regs.u.r16.ax, (unsigned) regs.u.r16.bx); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; break; } } #if BX_USE_PS2_MOUSE void int15_function_mouse(regs, ES, DS, FLAGS) pusha_regs_t regs; // REGS pushed via pusha Bit16u ES, DS, FLAGS; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u mouse_flags_1, mouse_flags_2; Bit16u mouse_driver_seg; Bit16u mouse_driver_offset; Bit8u comm_byte, prev_command_byte; Bit8u ret, mouse_data1, mouse_data2, mouse_data3; BX_DEBUG_INT15("int15 AX=%04x\n",regs.u.r16.ax); switch (regs.u.r8.ah) { case 0xC2: // Return Codes status in AH // ========================= // 00: success // 01: invalid subfunction (AL > 7) // 02: invalid input value (out of allowable range) // 03: interface error // 04: resend command received from mouse controller, // device driver should attempt command again // 05: cannot enable mouse, since no far call has been installed // 80/86: mouse service not implemented switch (regs.u.r8.al) { case 0: // Disable/Enable Mouse BX_DEBUG_INT15("case 0:\n"); switch (regs.u.r8.bh) { case 0: // Disable Mouse BX_DEBUG_INT15("case 0: disable mouse\n"); inhibit_mouse_int_and_events(); // disable IRQ12 and packets ret = send_to_mouse_ctrl(0xF5); // disable mouse command if (ret == 0) { ret = get_mouse_data(&mouse_data1); if ( (ret == 0) || (mouse_data1 == 0xFA) ) { CLEAR_CF(); regs.u.r8.ah = 0; return; } } // error SET_CF(); regs.u.r8.ah = ret; return; break; case 1: // Enable Mouse BX_DEBUG_INT15("case 1: enable mouse\n"); mouse_flags_2 = read_byte(ebda_seg, &EbdaData->mouse_flag2); if ( (mouse_flags_2 & 0x80) == 0 ) { BX_DEBUG_INT15("INT 15h C2 Enable Mouse, no far call handler\n"); SET_CF(); // error regs.u.r8.ah = 5; // no far call installed return; } inhibit_mouse_int_and_events(); // disable IRQ12 and packets ret = send_to_mouse_ctrl(0xF4); // enable mouse command if (ret == 0) { ret = get_mouse_data(&mouse_data1); if ( (ret == 0) && (mouse_data1 == 0xFA) ) { enable_mouse_int_and_events(); // turn IRQ12 and packet generation on CLEAR_CF(); regs.u.r8.ah = 0; return; } } SET_CF(); regs.u.r8.ah = ret; return; default: // invalid subfunction BX_DEBUG_INT15("INT 15h C2 AL=0, BH=%02x\n", (unsigned) regs.u.r8.bh); SET_CF(); // error regs.u.r8.ah = 1; // invalid subfunction return; } break; case 1: // Reset Mouse case 5: // Initialize Mouse BX_DEBUG_INT15("case 1 or 5:\n"); if (regs.u.r8.al == 5) { if (regs.u.r8.bh != 3) { SET_CF(); regs.u.r8.ah = 0x02; // invalid input return; } mouse_flags_2 = read_byte(ebda_seg, &EbdaData->mouse_flag2); mouse_flags_2 = (mouse_flags_2 & 0xF8) | regs.u.r8.bh - 1; mouse_flags_1 = 0x00; write_byte(ebda_seg, &EbdaData->mouse_flag1, mouse_flags_1); write_byte(ebda_seg, &EbdaData->mouse_flag2, mouse_flags_2); } inhibit_mouse_int_and_events(); // disable IRQ12 and packets ret = send_to_mouse_ctrl(0xFF); // reset mouse command if (ret == 0) { ret = get_mouse_data(&mouse_data3); // if no mouse attached, it will return RESEND if (mouse_data3 == 0xfe) { SET_CF(); return; } if (mouse_data3 != 0xfa) BX_PANIC("Mouse reset returned %02x (should be ack)\n", (unsigned)mouse_data3); if ( ret == 0 ) { ret = get_mouse_data(&mouse_data1); if ( ret == 0 ) { ret = get_mouse_data(&mouse_data2); if ( ret == 0 ) { // turn IRQ12 and packet generation on enable_mouse_int_and_events(); CLEAR_CF(); regs.u.r8.ah = 0; regs.u.r8.bl = mouse_data1; regs.u.r8.bh = mouse_data2; return; } } } } // error SET_CF(); regs.u.r8.ah = ret; return; case 2: // Set Sample Rate BX_DEBUG_INT15("case 2:\n"); switch (regs.u.r8.bh) { case 0: mouse_data1 = 10; break; // 10 reports/sec case 1: mouse_data1 = 20; break; // 20 reports/sec case 2: mouse_data1 = 40; break; // 40 reports/sec case 3: mouse_data1 = 60; break; // 60 reports/sec case 4: mouse_data1 = 80; break; // 80 reports/sec case 5: mouse_data1 = 100; break; // 100 reports/sec (default) case 6: mouse_data1 = 200; break; // 200 reports/sec default: mouse_data1 = 0; } if (mouse_data1 > 0) { ret = send_to_mouse_ctrl(0xF3); // set sample rate command if (ret == 0) { ret = get_mouse_data(&mouse_data2); ret = send_to_mouse_ctrl(mouse_data1); ret = get_mouse_data(&mouse_data2); CLEAR_CF(); regs.u.r8.ah = 0; } else { // error SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } } else { // error SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } break; case 3: // Set Resolution BX_DEBUG_INT15("case 3:\n"); // BH: // 0 = 25 dpi, 1 count per millimeter // 1 = 50 dpi, 2 counts per millimeter // 2 = 100 dpi, 4 counts per millimeter // 3 = 200 dpi, 8 counts per millimeter comm_byte = inhibit_mouse_int_and_events(); // disable IRQ12 and packets if (regs.u.r8.bh < 4) { ret = send_to_mouse_ctrl(0xE8); // set resolution command if (ret == 0) { ret = get_mouse_data(&mouse_data1); if (mouse_data1 != 0xfa) BX_PANIC("Mouse status returned %02x (should be ack)\n", (unsigned)mouse_data1); ret = send_to_mouse_ctrl(regs.u.r8.bh); ret = get_mouse_data(&mouse_data1); if (mouse_data1 != 0xfa) BX_PANIC("Mouse status returned %02x (should be ack)\n", (unsigned)mouse_data1); CLEAR_CF(); regs.u.r8.ah = 0; } else { // error SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } } else { // error SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } set_kbd_command_byte(comm_byte); // restore IRQ12 and serial enable break; case 4: // Get Device ID BX_DEBUG_INT15("case 4:\n"); inhibit_mouse_int_and_events(); // disable IRQ12 and packets ret = send_to_mouse_ctrl(0xF2); // get mouse ID command if (ret == 0) { ret = get_mouse_data(&mouse_data1); ret = get_mouse_data(&mouse_data2); CLEAR_CF(); regs.u.r8.ah = 0; regs.u.r8.bh = mouse_data2; } else { // error SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } break; case 6: // Return Status & Set Scaling Factor... BX_DEBUG_INT15("case 6:\n"); switch (regs.u.r8.bh) { case 0: // Return Status comm_byte = inhibit_mouse_int_and_events(); // disable IRQ12 and packets ret = send_to_mouse_ctrl(0xE9); // get mouse info command if (ret == 0) { ret = get_mouse_data(&mouse_data1); if (mouse_data1 != 0xfa) BX_PANIC("Mouse status returned %02x (should be ack)\n", (unsigned)mouse_data1); if (ret == 0) { ret = get_mouse_data(&mouse_data1); if (ret == 0) { ret = get_mouse_data(&mouse_data2); if (ret == 0) { ret = get_mouse_data(&mouse_data3); if (ret == 0) { CLEAR_CF(); regs.u.r8.ah = 0; regs.u.r8.bl = mouse_data1; regs.u.r8.cl = mouse_data2; regs.u.r8.dl = mouse_data3; set_kbd_command_byte(comm_byte); // restore IRQ12 and serial enable return; } } } } } // error SET_CF(); regs.u.r8.ah = ret; set_kbd_command_byte(comm_byte); // restore IRQ12 and serial enable return; case 1: // Set Scaling Factor to 1:1 case 2: // Set Scaling Factor to 2:1 comm_byte = inhibit_mouse_int_and_events(); // disable IRQ12 and packets if (regs.u.r8.bh == 1) { ret = send_to_mouse_ctrl(0xE6); } else { ret = send_to_mouse_ctrl(0xE7); } if (ret == 0) { get_mouse_data(&mouse_data1); ret = (mouse_data1 != 0xFA); } if (ret == 0) { CLEAR_CF(); regs.u.r8.ah = 0; } else { // error SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; } set_kbd_command_byte(comm_byte); // restore IRQ12 and serial enable break; default: BX_PANIC("INT 15h C2 AL=6, BH=%02x\n", (unsigned) regs.u.r8.bh); } break; case 7: // Set Mouse Handler Address BX_DEBUG_INT15("case 7:\n"); mouse_driver_seg = ES; mouse_driver_offset = regs.u.r16.bx; write_word(ebda_seg, &EbdaData->mouse_driver_offset, mouse_driver_offset); write_word(ebda_seg, &EbdaData->mouse_driver_seg, mouse_driver_seg); mouse_flags_2 = read_byte(ebda_seg, &EbdaData->mouse_flag2); if (mouse_driver_offset == 0 && mouse_driver_seg == 0) { /* remove handler */ if ( (mouse_flags_2 & 0x80) != 0 ) { mouse_flags_2 &= ~0x80; inhibit_mouse_int_and_events(); // disable IRQ12 and packets } } else { /* install handler */ mouse_flags_2 |= 0x80; } write_byte(ebda_seg, &EbdaData->mouse_flag2, mouse_flags_2); CLEAR_CF(); regs.u.r8.ah = 0; break; default: BX_DEBUG_INT15("case default:\n"); regs.u.r8.ah = 1; // invalid function SET_CF(); } break; default: BX_INFO("*** int 15h function AX=%04x, BX=%04x not yet supported!\n", (unsigned) regs.u.r16.ax, (unsigned) regs.u.r16.bx); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; break; } } #endif // BX_USE_PS2_MOUSE void set_e820_range(ES, DI, start, end, extra_start, extra_end, type) Bit16u ES; Bit16u DI; Bit32u start; Bit32u end; Bit8u extra_start; Bit8u extra_end; Bit16u type; { write_word(ES, DI, start); write_word(ES, DI+2, start >> 16); write_word(ES, DI+4, extra_start); write_word(ES, DI+6, 0x00); end -= start; extra_end -= extra_start; write_word(ES, DI+8, end); write_word(ES, DI+10, end >> 16); write_word(ES, DI+12, extra_end); write_word(ES, DI+14, 0x0000); write_word(ES, DI+16, type); write_word(ES, DI+18, 0x0); } void int15_function32(regs, ES, DS, FLAGS) pushad_regs_t regs; // REGS pushed via pushad Bit16u ES, DS, FLAGS; { Bit32u extended_memory_size=0; // 64bits long Bit32u extra_lowbits_memory_size=0; Bit16u CX,DX; Bit8u extra_highbits_memory_size=0; BX_DEBUG_INT15("int15 AX=%04x\n",regs.u.r16.ax); switch (regs.u.r8.ah) { case 0x86: // Wait for CX:DX microseconds. currently using the // refresh request port 0x61 bit4, toggling every 15usec CX = regs.u.r16.cx; DX = regs.u.r16.dx; ASM_START sti ;; Get the count in eax mov bx, sp SEG SS mov ax, _int15_function32.CX [bx] shl eax, #16 SEG SS mov ax, _int15_function32.DX [bx] ;; convert to numbers of 15usec ticks mov ebx, #15 xor edx, edx div eax, ebx mov ecx, eax ;; wait for ecx number of refresh requests in al, PORT_PS2_CTRLB and al,#0x10 mov ah, al or ecx, ecx je int1586_tick_end int1586_tick: in al, PORT_PS2_CTRLB and al,#0x10 cmp al, ah je int1586_tick mov ah, al dec ecx jnz int1586_tick int1586_tick_end: ASM_END break; case 0xe8: switch(regs.u.r8.al) { case 0x20: // coded by osmaker aka K.J. if(regs.u.r32.edx == 0x534D4150) { extended_memory_size = inb_cmos(0x35); extended_memory_size <<= 8; extended_memory_size |= inb_cmos(0x34); extended_memory_size *= 64; if(extended_memory_size > 0x2fc000) { extended_memory_size = 0x2fc000; // everything after this is reserved memory until we get to 0x100000000 } extended_memory_size *= 1024; extended_memory_size += (16L * 1024 * 1024); if(extended_memory_size <= (16L * 1024 * 1024)) { extended_memory_size = inb_cmos(0x31); extended_memory_size <<= 8; extended_memory_size |= inb_cmos(0x30); extended_memory_size *= 1024; extended_memory_size += (1L * 1024 * 1024); } extra_lowbits_memory_size = inb_cmos(0x5c); extra_lowbits_memory_size <<= 8; extra_lowbits_memory_size |= inb_cmos(0x5b); extra_lowbits_memory_size *= 64; extra_lowbits_memory_size *= 1024; extra_highbits_memory_size = inb_cmos(0x5d); switch(regs.u.r16.bx) { case 0: set_e820_range(ES, regs.u.r16.di, 0x0000000L, 0x0009f000L, 0, 0, E820_RAM); regs.u.r32.ebx = 1; break; case 1: set_e820_range(ES, regs.u.r16.di, 0x0009f000L, 0x000a0000L, 0, 0, E820_RESERVED); regs.u.r32.ebx = 2; break; case 2: set_e820_range(ES, regs.u.r16.di, 0x000e8000L, 0x00100000L, 0, 0, E820_RESERVED); if (extended_memory_size <= 0x100000) regs.u.r32.ebx = 6; else regs.u.r32.ebx = 3; break; case 3: #if BX_ROMBIOS32 #ifdef BX_USE_EBDA_TABLES set_e820_range(ES, regs.u.r16.di, 0x00100000L, extended_memory_size - ACPI_DATA_SIZE - MPTABLE_MAX_SIZE, 0, 0, E820_RAM); regs.u.r32.ebx = 4; #else set_e820_range(ES, regs.u.r16.di, 0x00100000L, extended_memory_size - ACPI_DATA_SIZE, 0, 0, E820_RAM); regs.u.r32.ebx = 5; #endif #else set_e820_range(ES, regs.u.r16.di, 0x00100000L, extended_memory_size, 0, 0, E820_RAM); regs.u.r32.ebx = 6; #endif break; case 4: set_e820_range(ES, regs.u.r16.di, extended_memory_size - ACPI_DATA_SIZE - MPTABLE_MAX_SIZE, extended_memory_size - ACPI_DATA_SIZE, 0, 0, E820_RESERVED); regs.u.r32.ebx = 5; break; case 5: set_e820_range(ES, regs.u.r16.di, extended_memory_size - ACPI_DATA_SIZE, extended_memory_size, 0, 0, E820_ACPI); regs.u.r32.ebx = 6; break; case 6: /* 256KB BIOS area at the end of 4 GB */ set_e820_range(ES, regs.u.r16.di, 0xfffc0000L, 0x00000000L, 0, 0, E820_RESERVED); if (extra_highbits_memory_size || extra_lowbits_memory_size) regs.u.r32.ebx = 7; else regs.u.r32.ebx = 0; break; case 7: /* Mapping of memory above 4 GB */ set_e820_range(ES, regs.u.r16.di, 0x00000000L, extra_lowbits_memory_size, 1, extra_highbits_memory_size + 1, E820_RAM); regs.u.r32.ebx = 0; break; default: /* AX=E820, DX=534D4150, BX unrecognized */ goto int15_unimplemented; break; } regs.u.r32.eax = 0x534D4150; regs.u.r32.ecx = 0x14; CLEAR_CF(); } else { // if DX != 0x534D4150) goto int15_unimplemented; } break; case 0x01: // do we have any reason to fail here ? CLEAR_CF(); // my real system sets ax and bx to 0 // this is confirmed by Ralph Brown list // but syslinux v1.48 is known to behave // strangely if ax is set to 0 // regs.u.r16.ax = 0; // regs.u.r16.bx = 0; // Get the amount of extended memory (above 1M) regs.u.r8.cl = inb_cmos(0x30); regs.u.r8.ch = inb_cmos(0x31); // limit to 15M if(regs.u.r16.cx > 0x3c00) { regs.u.r16.cx = 0x3c00; } // Get the amount of extended memory above 16M in 64k blocs regs.u.r8.dl = inb_cmos(0x34); regs.u.r8.dh = inb_cmos(0x35); // Set configured memory equal to extended memory regs.u.r16.ax = regs.u.r16.cx; regs.u.r16.bx = regs.u.r16.dx; break; default: /* AH=0xE8?? but not implemented */ goto int15_unimplemented; } break; int15_unimplemented: // fall into the default default: BX_INFO("*** int 15h function AX=%04x, BX=%04x not yet supported!\n", (unsigned) regs.u.r16.ax, (unsigned) regs.u.r16.bx); SET_CF(); regs.u.r8.ah = UNSUPPORTED_FUNCTION; break; } } void int16_function(DI, SI, BP, SP, BX, DX, CX, AX, FLAGS) Bit16u DI, SI, BP, SP, BX, DX, CX, AX, FLAGS; { Bit8u scan_code, ascii_code, shift_flags, led_flags, count; Bit16u kbd_code, max; BX_DEBUG_INT16("int16: AX=%04x BX=%04x CX=%04x DX=%04x \n", AX, BX, CX, DX); shift_flags = read_byte(0x0040, 0x17); led_flags = read_byte(0x0040, 0x97); if ((((shift_flags >> 4) & 0x07) ^ (led_flags & 0x07)) != 0) { ASM_START cli ASM_END outb(PORT_PS2_DATA, 0xed); while ((inb(PORT_PS2_STATUS) & 0x01) == 0) outb(PORT_DIAG, 0x21); if ((inb(PORT_PS2_DATA) == 0xfa)) { led_flags &= 0xf8; led_flags |= ((shift_flags >> 4) & 0x07); outb(PORT_PS2_DATA, led_flags & 0x07); while ((inb(PORT_PS2_STATUS) & 0x01) == 0) outb(PORT_DIAG, 0x21); inb(PORT_PS2_DATA); write_byte(0x0040, 0x97, led_flags); } ASM_START sti ASM_END } switch (GET_AH()) { case 0x00: /* read keyboard input */ if ( !dequeue_key(&scan_code, &ascii_code, 1) ) { BX_PANIC("KBD: int16h: out of keyboard input\n"); } if (scan_code !=0 && ascii_code == 0xF0) ascii_code = 0; else if (ascii_code == 0xE0) ascii_code = 0; AX = (scan_code << 8) | ascii_code; break; case 0x01: /* check keyboard status */ if ( !dequeue_key(&scan_code, &ascii_code, 0) ) { SET_ZF(); return; } if (scan_code !=0 && ascii_code == 0xF0) ascii_code = 0; else if (ascii_code == 0xE0) ascii_code = 0; AX = (scan_code << 8) | ascii_code; CLEAR_ZF(); break; case 0x02: /* get shift flag status */ shift_flags = read_byte(0x0040, 0x17); SET_AL(shift_flags); break; case 0x05: /* store key-stroke into buffer */ if ( !enqueue_key(GET_CH(), GET_CL()) ) { SET_AL(1); } else { SET_AL(0); } break; case 0x09: /* GET KEYBOARD FUNCTIONALITY */ // bit Bochs Description // 7 0 reserved // 6 0 INT 16/AH=20h-22h supported (122-key keyboard support) // 5 1 INT 16/AH=10h-12h supported (enhanced keyboard support) // 4 1 INT 16/AH=0Ah supported // 3 0 INT 16/AX=0306h supported // 2 0 INT 16/AX=0305h supported // 1 0 INT 16/AX=0304h supported // 0 0 INT 16/AX=0300h supported // SET_AL(0x30); break; case 0x0A: /* GET KEYBOARD ID */ count = 2; kbd_code = 0x0; outb(PORT_PS2_DATA, 0xf2); /* Wait for data */ max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x00); if (max>0x0) { if ((inb(PORT_PS2_DATA) == 0xfa)) { do { max=0xffff; while ( ((inb(PORT_PS2_STATUS) & 0x01) == 0) && (--max>0) ) outb(PORT_DIAG, 0x00); if (max>0x0) { kbd_code >>= 8; kbd_code |= (inb(PORT_PS2_DATA) << 8); } } while (--count>0); } } BX=kbd_code; break; case 0x10: /* read MF-II keyboard input */ if ( !dequeue_key(&scan_code, &ascii_code, 1) ) { BX_PANIC("KBD: int16h: out of keyboard input\n"); } if (scan_code !=0 && ascii_code == 0xF0) ascii_code = 0; AX = (scan_code << 8) | ascii_code; break; case 0x11: /* check MF-II keyboard status */ if ( !dequeue_key(&scan_code, &ascii_code, 0) ) { SET_ZF(); return; } if (scan_code !=0 && ascii_code == 0xF0) ascii_code = 0; AX = (scan_code << 8) | ascii_code; CLEAR_ZF(); break; case 0x12: /* get extended keyboard status */ shift_flags = read_byte(0x0040, 0x17); SET_AL(shift_flags); shift_flags = read_byte(0x0040, 0x18) & 0x73; shift_flags |= read_byte(0x0040, 0x96) & 0x0c; SET_AH(shift_flags); BX_DEBUG_INT16("int16: func 12 sending %04x\n",AX); break; case 0x92: /* keyboard capability check called by DOS 5.0+ keyb */ SET_AH(0x80); // function int16 ah=0x10-0x12 supported break; case 0xA2: /* 122 keys capability check called by DOS 5.0+ keyb */ // don't change AH : function int16 ah=0x20-0x22 NOT supported break; case 0x6F: if (GET_AL() == 0x08) SET_AH(0x02); // unsupported, aka normal keyboard default: BX_INFO("KBD: unsupported int 16h function %02x\n", GET_AH()); } } unsigned int dequeue_key(scan_code, ascii_code, incr) Bit8u *scan_code; Bit8u *ascii_code; unsigned int incr; { Bit16u buffer_start, buffer_end, buffer_head, buffer_tail; Bit16u ss; Bit8u acode, scode; buffer_start = read_word(0x0040, 0x0080); buffer_end = read_word(0x0040, 0x0082); buffer_head = read_word(0x0040, 0x001a); buffer_tail = read_word(0x0040, 0x001c); if (buffer_head != buffer_tail) { ss = get_SS(); acode = read_byte(0x0040, buffer_head); scode = read_byte(0x0040, buffer_head+1); write_byte(ss, ascii_code, acode); write_byte(ss, scan_code, scode); if (incr) { buffer_head += 2; if (buffer_head >= buffer_end) buffer_head = buffer_start; write_word(0x0040, 0x001a, buffer_head); } return(1); } else { return(0); } } static char panic_msg_keyb_buffer_full[] = "%s: keyboard input buffer full\n"; Bit8u inhibit_mouse_int_and_events() { Bit8u command_byte, prev_command_byte; // Turn off IRQ generation and aux data line if ( inb(PORT_PS2_STATUS) & 0x02 ) BX_PANIC(panic_msg_keyb_buffer_full,"inhibmouse"); outb(PORT_PS2_STATUS, 0x20); // get command byte while ( (inb(PORT_PS2_STATUS) & 0x01) != 0x01 ); prev_command_byte = inb(PORT_PS2_DATA); command_byte = prev_command_byte; //while ( (inb(PORT_PS2_STATUS) & 0x02) ); if ( inb(PORT_PS2_STATUS) & 0x02 ) BX_PANIC(panic_msg_keyb_buffer_full,"inhibmouse"); command_byte &= 0xfd; // turn off IRQ 12 generation command_byte |= 0x20; // disable mouse serial clock line outb(PORT_PS2_STATUS, 0x60); // write command byte outb(PORT_PS2_DATA, command_byte); return(prev_command_byte); } void enable_mouse_int_and_events() { Bit8u command_byte; // Turn on IRQ generation and aux data line if ( inb(PORT_PS2_STATUS) & 0x02 ) BX_PANIC(panic_msg_keyb_buffer_full,"enabmouse"); outb(PORT_PS2_STATUS, 0x20); // get command byte while ( (inb(PORT_PS2_STATUS) & 0x01) != 0x01 ); command_byte = inb(PORT_PS2_DATA); //while ( (inb(PORT_PS2_STATUS) & 0x02) ); if ( inb(PORT_PS2_STATUS) & 0x02 ) BX_PANIC(panic_msg_keyb_buffer_full,"enabmouse"); command_byte |= 0x02; // turn on IRQ 12 generation command_byte &= 0xdf; // enable mouse serial clock line outb(PORT_PS2_STATUS, 0x60); // write command byte outb(PORT_PS2_DATA, command_byte); } Bit8u send_to_mouse_ctrl(sendbyte) Bit8u sendbyte; { Bit8u response; // wait for chance to write to ctrl if ( inb(PORT_PS2_STATUS) & 0x02 ) BX_PANIC(panic_msg_keyb_buffer_full,"sendmouse"); outb(PORT_PS2_STATUS, 0xD4); outb(PORT_PS2_DATA, sendbyte); return(0); } Bit8u get_mouse_data(data) Bit8u *data; { Bit8u response; Bit16u ss; while ((inb(PORT_PS2_STATUS) & 0x21) != 0x21) { } response = inb(PORT_PS2_DATA); ss = get_SS(); write_byte(ss, data, response); return(0); } void set_kbd_command_byte(command_byte) Bit8u command_byte; { if ( inb(PORT_PS2_STATUS) & 0x02 ) BX_PANIC(panic_msg_keyb_buffer_full,"setkbdcomm"); outb(PORT_PS2_STATUS, 0xD4); outb(PORT_PS2_STATUS, 0x60); // write command byte outb(PORT_PS2_DATA, command_byte); } void int09_function(DI, SI, BP, SP, BX, DX, CX, AX) Bit16u DI, SI, BP, SP, BX, DX, CX, AX; { Bit8u scancode, asciicode, shift_flags; Bit8u mf2_flags, mf2_state; // // DS has been set to F000 before call // scancode = GET_AL(); if (scancode == 0) { BX_INFO("KBD: int09 handler: AL=0\n"); return; } shift_flags = read_byte(0x0040, 0x17); mf2_flags = read_byte(0x0040, 0x18); mf2_state = read_byte(0x0040, 0x96); asciicode = 0; switch (scancode) { case 0x3a: /* Caps Lock press */ shift_flags ^= 0x40; write_byte(0x0040, 0x17, shift_flags); mf2_flags |= 0x40; write_byte(0x0040, 0x18, mf2_flags); break; case 0xba: /* Caps Lock release */ mf2_flags &= ~0x40; write_byte(0x0040, 0x18, mf2_flags); break; case 0x2a: /* L Shift press */ shift_flags |= 0x02; write_byte(0x0040, 0x17, shift_flags); break; case 0xaa: /* L Shift release */ shift_flags &= ~0x02; write_byte(0x0040, 0x17, shift_flags); break; case 0x36: /* R Shift press */ shift_flags |= 0x01; write_byte(0x0040, 0x17, shift_flags); break; case 0xb6: /* R Shift release */ shift_flags &= ~0x01; write_byte(0x0040, 0x17, shift_flags); break; case 0x1d: /* Ctrl press */ if ((mf2_state & 0x01) == 0) { shift_flags |= 0x04; write_byte(0x0040, 0x17, shift_flags); if (mf2_state & 0x02) { mf2_state |= 0x04; write_byte(0x0040, 0x96, mf2_state); } else { mf2_flags |= 0x01; write_byte(0x0040, 0x18, mf2_flags); } } break; case 0x9d: /* Ctrl release */ if ((mf2_state & 0x01) == 0) { shift_flags &= ~0x04; write_byte(0x0040, 0x17, shift_flags); if (mf2_state & 0x02) { mf2_state &= ~0x04; write_byte(0x0040, 0x96, mf2_state); } else { mf2_flags &= ~0x01; write_byte(0x0040, 0x18, mf2_flags); } } break; case 0x38: /* Alt press */ shift_flags |= 0x08; write_byte(0x0040, 0x17, shift_flags); if (mf2_state & 0x02) { mf2_state |= 0x08; write_byte(0x0040, 0x96, mf2_state); } else { mf2_flags |= 0x02; write_byte(0x0040, 0x18, mf2_flags); } break; case 0xb8: /* Alt release */ shift_flags &= ~0x08; write_byte(0x0040, 0x17, shift_flags); if (mf2_state & 0x02) { mf2_state &= ~0x08; write_byte(0x0040, 0x96, mf2_state); } else { mf2_flags &= ~0x02; write_byte(0x0040, 0x18, mf2_flags); } break; case 0x45: /* Num Lock press */ if ((mf2_state & 0x03) == 0) { mf2_flags |= 0x20; write_byte(0x0040, 0x18, mf2_flags); shift_flags ^= 0x20; write_byte(0x0040, 0x17, shift_flags); } break; case 0xc5: /* Num Lock release */ if ((mf2_state & 0x03) == 0) { mf2_flags &= ~0x20; write_byte(0x0040, 0x18, mf2_flags); } break; case 0x46: /* Scroll Lock or Ctrl-Break press */ if ((mf2_state & 0x02) || (!(mf2_state & 0x10) && (shift_flags & 0x04))) { /* Ctrl-Break press */ mf2_state &= ~0x02; write_byte(0x0040, 0x96, mf2_state); write_byte(0x0040, 0x71, 0x80); write_word(0x0040, 0x001C, read_word(0x0040, 0x001A)); ASM_START int #0x1B ASM_END enqueue_key(0, 0); } else { /* Scroll Lock press */ mf2_flags |= 0x10; write_byte(0x0040, 0x18, mf2_flags); shift_flags ^= 0x10; write_byte(0x0040, 0x17, shift_flags); } break; case 0xc6: /* Scroll Lock or Ctrl-Break release */ if ((mf2_state & 0x02) || (!(mf2_state & 0x10) && (shift_flags & 0x04))) { /* Ctrl-Break release */ /* nothing to do */ } else { /* Scroll Lock release */ mf2_flags &= ~0x10; write_byte(0x0040, 0x18, mf2_flags); } break; default: if (scancode & 0x80) { break; /* toss key releases ... */ } if (scancode > MAX_SCAN_CODE) { BX_INFO("KBD: int09h_handler(): unknown scancode read: 0x%02x!\n", scancode); return; } if (scancode == 0x53) { /* DEL */ if ((shift_flags & 0x0f) == 0x0c) { /* CTRL+ALT */ write_word(0x0040, 0x0072, 0x1234); ASM_START jmp 0xf000:post; ASM_END } } if (shift_flags & 0x08) { /* ALT */ asciicode = scan_to_scanascii[scancode].alt; scancode = scan_to_scanascii[scancode].alt >> 8; } else if (shift_flags & 0x04) { /* CONTROL */ asciicode = scan_to_scanascii[scancode].control; scancode = scan_to_scanascii[scancode].control >> 8; } else if (((mf2_state & 0x02) > 0) && ((scancode >= 0x47) && (scancode <= 0x53))) { /* extended keys handling */ asciicode = 0xe0; scancode = scan_to_scanascii[scancode].normal >> 8; } else if (shift_flags & 0x03) { /* LSHIFT + RSHIFT */ /* check if lock state should be ignored * because a SHIFT key are pressed */ if (shift_flags & scan_to_scanascii[scancode].lock_flags) { asciicode = scan_to_scanascii[scancode].normal; scancode = scan_to_scanascii[scancode].normal >> 8; } else { asciicode = scan_to_scanascii[scancode].shift; scancode = scan_to_scanascii[scancode].shift >> 8; } } else { /* check if lock is on */ if (shift_flags & scan_to_scanascii[scancode].lock_flags) { asciicode = scan_to_scanascii[scancode].shift; scancode = scan_to_scanascii[scancode].shift >> 8; } else { asciicode = scan_to_scanascii[scancode].normal; scancode = scan_to_scanascii[scancode].normal >> 8; } } if (scancode==0 && asciicode==0) { BX_INFO("KBD: int09h_handler(): scancode & asciicode are zero?\n"); } enqueue_key(scancode, asciicode); break; } if ((scancode & 0x7f) != 0x1d) { mf2_state &= ~0x01; } mf2_state &= ~0x02; write_byte(0x0040, 0x96, mf2_state); } unsigned int enqueue_key(scan_code, ascii_code) Bit8u scan_code, ascii_code; { Bit16u buffer_start, buffer_end, buffer_head, buffer_tail, temp_tail; buffer_start = read_word(0x0040, 0x0080); buffer_end = read_word(0x0040, 0x0082); buffer_head = read_word(0x0040, 0x001A); buffer_tail = read_word(0x0040, 0x001C); temp_tail = buffer_tail; buffer_tail += 2; if (buffer_tail >= buffer_end) buffer_tail = buffer_start; if (buffer_tail == buffer_head) { return(0); } write_byte(0x0040, temp_tail, ascii_code); write_byte(0x0040, temp_tail+1, scan_code); write_word(0x0040, 0x001C, buffer_tail); return(1); } void int74_function(make_farcall, Z, Y, X, status) Bit16u make_farcall, Z, Y, X, status; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u in_byte, index, package_count; Bit8u mouse_flags_1, mouse_flags_2; BX_DEBUG_INT74("entering int74_function\n"); make_farcall = 0; in_byte = inb(PORT_PS2_STATUS); if ((in_byte & 0x21) != 0x21) { return; } in_byte = inb(PORT_PS2_DATA); BX_DEBUG_INT74("int74: read byte %02x\n", in_byte); mouse_flags_1 = read_byte(ebda_seg, &EbdaData->mouse_flag1); mouse_flags_2 = read_byte(ebda_seg, &EbdaData->mouse_flag2); if ((mouse_flags_2 & 0x80) != 0x80) { return; } package_count = mouse_flags_2 & 0x07; index = mouse_flags_1 & 0x07; write_byte(ebda_seg, &EbdaData->mouse_data[index], in_byte); if (index >= package_count) { BX_DEBUG_INT74("int74_function: make_farcall=1\n"); status = read_byte(ebda_seg, &EbdaData->mouse_data[0]); X = read_byte(ebda_seg, &EbdaData->mouse_data[1]); Y = read_byte(ebda_seg, &EbdaData->mouse_data[2]); Z = 0; mouse_flags_1 = 0; // check if far call handler installed if (mouse_flags_2 & 0x80) make_farcall = 1; } else { mouse_flags_1++; } write_byte(ebda_seg, &EbdaData->mouse_flag1, mouse_flags_1); } #define SET_DISK_RET_STATUS(status) write_byte(0x0040, 0x0074, status) #if BX_USE_ATADRV int int13_edd(DS, SI, device) Bit16u DS, SI; Bit8u device; { Bit32u lba_low, lba_high; Bit16u npc, nph, npspt, size, t13; Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u type=read_byte(ebda_seg,&EbdaData->ata.devices[device].type); size=read_word(DS,SI+(Bit16u)&Int13DPT->size); t13 = size == 74; // Buffer is too small if(size < 26) return 1; // EDD 1.x if(size >= 26) { Bit16u blksize, infos; write_word(DS, SI+(Bit16u)&Int13DPT->size, 26); blksize = read_word(ebda_seg, &EbdaData->ata.devices[device].blksize); if (type == ATA_TYPE_ATA) { npc = read_word(ebda_seg, &EbdaData->ata.devices[device].pchs.cylinders); nph = read_word(ebda_seg, &EbdaData->ata.devices[device].pchs.heads); npspt = read_word(ebda_seg, &EbdaData->ata.devices[device].pchs.spt); lba_low = read_dword(ebda_seg, &EbdaData->ata.devices[device].sectors_low); lba_high = read_dword(ebda_seg, &EbdaData->ata.devices[device].sectors_high); if (lba_high || (lba_low/npspt)/nph > 0x3fff) { infos = 0 << 1; // geometry is invalid npc = 0x3fff; } else { infos = 1 << 1; // geometry is valid } } if (type == ATA_TYPE_ATAPI) { npc = 0xffffffff; nph = 0xffffffff; npspt = 0xffffffff; lba_low = 0xffffffff; lba_high = 0xffffffff; infos = 1 << 2 /* removable */ | 1 << 4 /* media change */ | 1 << 5 /* lockable */ | 1 << 6; /* max values */ } write_word(DS, SI+(Bit16u)&Int13DPT->infos, infos); write_dword(DS, SI+(Bit16u)&Int13DPT->cylinders, (Bit32u)npc); write_dword(DS, SI+(Bit16u)&Int13DPT->heads, (Bit32u)nph); write_dword(DS, SI+(Bit16u)&Int13DPT->spt, (Bit32u)npspt); write_dword(DS, SI+(Bit16u)&Int13DPT->sector_count1, lba_low); write_dword(DS, SI+(Bit16u)&Int13DPT->sector_count2, lba_high); write_word(DS, SI+(Bit16u)&Int13DPT->blksize, blksize); } // EDD 2.x if(size >= 30) { Bit8u channel, dev, irq, mode, checksum, i, translation; Bit16u iobase1, iobase2, options; write_word(DS, SI+(Bit16u)&Int13DPT->size, 30); write_word(DS, SI+(Bit16u)&Int13DPT->dpte_segment, ebda_seg); write_word(DS, SI+(Bit16u)&Int13DPT->dpte_offset, &EbdaData->ata.dpte); // Fill in dpte channel = device / 2; iobase1 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase1); iobase2 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase2); irq = read_byte(ebda_seg, &EbdaData->ata.channels[channel].irq); mode = read_byte(ebda_seg, &EbdaData->ata.devices[device].mode); translation = read_byte(ebda_seg, &EbdaData->ata.devices[device].translation); options = (1<<4); // lba translation options |= (mode==ATA_MODE_PIO32?1:0)<<7; if (type == ATA_TYPE_ATA) { options |= (translation==ATA_TRANSLATION_NONE?0:1)<<3; // chs translation options |= (translation==ATA_TRANSLATION_LBA?1:0)<<9; options |= (translation==ATA_TRANSLATION_RECHS?3:0)<<9; } if (type == ATA_TYPE_ATAPI) { options |= (1<<5); // removable device options |= (1<<6); // atapi device } write_word(ebda_seg, &EbdaData->ata.dpte.iobase1, iobase1); write_word(ebda_seg, &EbdaData->ata.dpte.iobase2, iobase2 + ATA_CB_DC); write_byte(ebda_seg, &EbdaData->ata.dpte.prefix, (0xe | (device % 2))<<4 ); write_byte(ebda_seg, &EbdaData->ata.dpte.unused, 0xcb ); write_byte(ebda_seg, &EbdaData->ata.dpte.irq, irq ); write_byte(ebda_seg, &EbdaData->ata.dpte.blkcount, 1 ); write_byte(ebda_seg, &EbdaData->ata.dpte.dma, 0 ); write_byte(ebda_seg, &EbdaData->ata.dpte.pio, 0 ); write_word(ebda_seg, &EbdaData->ata.dpte.options, options); write_word(ebda_seg, &EbdaData->ata.dpte.reserved, 0); write_byte(ebda_seg, &EbdaData->ata.dpte.revision, 0x11); checksum=0; for (i=0; i<15; i++) checksum+=read_byte(ebda_seg, ((Bit8u*)(&EbdaData->ata.dpte)) + i); checksum = -checksum; write_byte(ebda_seg, &EbdaData->ata.dpte.checksum, checksum); } // EDD 3.x if(size >= 66) { Bit8u channel, iface, checksum, i; Bit16u iobase1; channel = device / 2; iface = read_byte(ebda_seg, &EbdaData->ata.channels[channel].iface); iobase1 = read_word(ebda_seg, &EbdaData->ata.channels[channel].iobase1); write_word(DS, SI+(Bit16u)&Int13DPT->dpi.t13.key, 0xbedd); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.dpi_length, t13 ? 44 : 36); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.reserved1, 0); write_word(DS, SI+(Bit16u)&Int13DPT->dpi.t13.reserved2, 0); if (iface==ATA_IFACE_ISA) { write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.host_bus[0], 'I'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.host_bus[1], 'S'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.host_bus[2], 'A'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.host_bus[3], ' '); } else { // FIXME PCI } if (type == ATA_TYPE_ATA) { write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[0], 'A'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[1], 'T'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[2], 'A'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[3], ' '); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[4], ' '); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[5], ' '); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[6], ' '); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[7], ' '); } else if (type == ATA_TYPE_ATAPI) { write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[0], 'A'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[1], 'T'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[2], 'A'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[3], 'P'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[4], 'I'); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[5], ' '); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[6], ' '); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_type[7], ' '); } if (iface==ATA_IFACE_ISA) { write_word(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_path[0], iobase1); write_word(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_path[2], 0); write_dword(DS, SI+(Bit16u)&Int13DPT->dpi.t13.iface_path[4], 0L); } else { // FIXME PCI } write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.device_path[0], device%2); write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.device_path[1], 0); write_word(DS, SI+(Bit16u)&Int13DPT->dpi.t13.device_path[2], 0); write_dword(DS, SI+(Bit16u)&Int13DPT->dpi.t13.device_path[4], 0L); if (t13) { write_dword(DS, SI+(Bit16u)&Int13DPT->dpi.t13.device_path[8], 0L); write_dword(DS, SI+(Bit16u)&Int13DPT->dpi.t13.device_path[12], 0L); } if (t13) write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.reserved3, 0); else write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.phoenix.reserved3, 0); checksum = 0; for (i = 30; i < (t13 ? 73 : 65); i++) checksum += read_byte(DS, SI + i); checksum = -checksum; if (t13) write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.t13.checksum, checksum); else write_byte(DS, SI+(Bit16u)&Int13DPT->dpi.phoenix.checksum, checksum); } return 0; } void int13_harddisk(EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS) Bit16u EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS; { Bit32u lba_low, lba_high; Bit16u ebda_seg=read_word(0x0040,0x000E); Bit16u cylinder, head, sector; Bit16u segment, offset; Bit16u npc, nph, npspt, nlc, nlh, nlspt; Bit16u size, count; Bit8u device, status; BX_DEBUG_INT13_HD("int13_harddisk: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", AX, BX, CX, DX, ES); write_byte(0x0040, 0x008e, 0); // clear completion flag // basic check : device has to be defined if ( (GET_ELDL() < 0x80) || (GET_ELDL() >= 0x80 + BX_MAX_ATA_DEVICES) ) { BX_INFO("int13_harddisk: function %02x, ELDL out of range %02x\n", GET_AH(), GET_ELDL()); goto int13_fail; } // Get the ata channel device=read_byte(ebda_seg,&EbdaData->ata.hdidmap[GET_ELDL()-0x80]); // basic check : device has to be valid if (device >= BX_MAX_ATA_DEVICES) { BX_INFO("int13_harddisk: function %02x, unmapped device for ELDL=%02x\n", GET_AH(), GET_ELDL()); goto int13_fail; } switch (GET_AH()) { case 0x00: /* disk controller reset */ ata_reset (device); goto int13_success; break; case 0x01: /* read disk status */ status = read_byte(0x0040, 0x0074); SET_AH(status); SET_DISK_RET_STATUS(0); /* set CF if error status read */ if (status) goto int13_fail_nostatus; else goto int13_success_noah; break; case 0x02: // read disk sectors case 0x03: // write disk sectors case 0x04: // verify disk sectors count = GET_AL(); cylinder = GET_CH(); cylinder |= ( ((Bit16u) GET_CL()) << 2) & 0x300; sector = (GET_CL() & 0x3f); head = GET_DH(); segment = ES; offset = BX; if ((count > 128) || (count == 0) || (sector == 0)) { BX_INFO("int13_harddisk: function %02x, parameter out of range!\n",GET_AH()); goto int13_fail; } nlc = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.cylinders); nlh = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.heads); nlspt = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.spt); // sanity check on cyl heads, sec if( (cylinder >= nlc) || (head >= nlh) || (sector > nlspt) ) { BX_INFO("int13_harddisk: function %02x, parameters out of range %04x/%04x/%04x!\n", GET_AH(), cylinder, head, sector); goto int13_fail; } // FIXME verify if (GET_AH() == 0x04) goto int13_success; nph = read_word(ebda_seg, &EbdaData->ata.devices[device].pchs.heads); npspt = read_word(ebda_seg, &EbdaData->ata.devices[device].pchs.spt); // if needed, translate lchs to lba, and execute command if ( (nph != nlh) || (npspt != nlspt)) { lba_low = ((((Bit32u)cylinder * (Bit32u)nlh) + (Bit32u)head) * (Bit32u)nlspt) + (Bit32u)sector - 1; lba_high = 0; sector = 0; // this forces the command to be lba } if (GET_AH() == 0x02) status=ata_cmd_data_in(device, ATA_CMD_READ_SECTORS, count, cylinder, head, sector, lba_low, lba_high, segment, offset); else status=ata_cmd_data_out(device, ATA_CMD_WRITE_SECTORS, count, cylinder, head, sector, lba_low, lba_high, segment, offset); // Set nb of sector transferred SET_AL(read_word(ebda_seg, &EbdaData->ata.trsfsectors)); if (status != 0) { BX_INFO("int13_harddisk: function %02x, error %02x !\n",GET_AH(),status); SET_AH(0x0c); goto int13_fail_noah; } goto int13_success; break; case 0x05: /* format disk track */ BX_INFO("format disk track called\n"); goto int13_success; return; break; case 0x08: /* read disk drive parameters */ // Get logical geometry from table nlc = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.cylinders); nlh = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.heads); nlspt = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.spt); count = read_byte(ebda_seg, &EbdaData->ata.hdcount); nlc = nlc - 1; /* 0 based */ SET_AL(0); SET_CH(nlc & 0xff); SET_CL(((nlc >> 2) & 0xc0) | (nlspt & 0x3f)); SET_DH(nlh - 1); SET_DL(count); /* FIXME returns 0, 1, or n hard drives */ // FIXME should set ES & DI goto int13_success; break; case 0x10: /* check drive ready */ // should look at 40:8E also??? // Read the status from controller status = inb(read_word(ebda_seg, &EbdaData->ata.channels[device/2].iobase1) + ATA_CB_STAT); if ( (status & (ATA_CB_STAT_BSY | ATA_CB_STAT_RDY)) == ATA_CB_STAT_RDY ) { goto int13_success; } else { SET_AH(0xAA); goto int13_fail_noah; } break; case 0x15: /* read disk drive size */ // Get logical geometry from table nlc = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.cylinders); nlh = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.heads); nlspt = read_word(ebda_seg, &EbdaData->ata.devices[device].lchs.spt); // Compute sector count seen by int13 lba_low = (Bit32u)(nlc - 1) * (Bit32u)nlh * (Bit32u)nlspt; CX = lba_low >> 16; DX = lba_low & 0xffff; SET_AH(3); // hard disk accessible goto int13_success_noah; break; case 0x41: // IBM/MS installation check BX=0xaa55; // install check SET_AH(0x30); // EDD 3.0 CX=0x0007; // ext disk access and edd, removable supported goto int13_success_noah; break; case 0x42: // IBM/MS extended read case 0x43: // IBM/MS extended write case 0x44: // IBM/MS verify case 0x47: // IBM/MS extended seek count=read_word(DS, SI+(Bit16u)&Int13Ext->count); segment=read_word(DS, SI+(Bit16u)&Int13Ext->segment); offset=read_word(DS, SI+(Bit16u)&Int13Ext->offset); // Get 32 msb lba and check lba_high=read_dword(DS, SI+(Bit16u)&Int13Ext->lba2); if (lba_high > read_dword(ebda_seg, &EbdaData->ata.devices[device].sectors_high) ) { BX_INFO("int13_harddisk: function %02x. LBA out of range\n",GET_AH()); goto int13_fail; } // Get 32 lsb lba and check lba_low=read_dword(DS, SI+(Bit16u)&Int13Ext->lba1); if (lba_high == read_dword(ebda_seg, &EbdaData->ata.devices[device].sectors_high) && lba_low >= read_dword(ebda_seg, &EbdaData->ata.devices[device].sectors_low) ) { BX_INFO("int13_harddisk: function %02x. LBA out of range\n",GET_AH()); goto int13_fail; } // If verify or seek if (( GET_AH() == 0x44 ) || ( GET_AH() == 0x47 )) goto int13_success; // Execute the command if (GET_AH() == 0x42) status=ata_cmd_data_in(device, ATA_CMD_READ_SECTORS, count, 0, 0, 0, lba_low, lba_high, segment, offset); else status=ata_cmd_data_out(device, ATA_CMD_WRITE_SECTORS, count, 0, 0, 0, lba_low, lba_high, segment, offset); count=read_word(ebda_seg, &EbdaData->ata.trsfsectors); write_word(DS, SI+(Bit16u)&Int13Ext->count, count); if (status != 0) { BX_INFO("int13_harddisk: function %02x, error %02x !\n",GET_AH(),status); SET_AH(0x0c); goto int13_fail_noah; } goto int13_success; break; case 0x45: // IBM/MS lock/unlock drive case 0x49: // IBM/MS extended media change goto int13_success; // Always success for HD break; case 0x46: // IBM/MS eject media SET_AH(0xb2); // Volume Not Removable goto int13_fail_noah; // Always fail for HD break; case 0x48: // IBM/MS get drive parameters if (int13_edd(DS, SI, device)) goto int13_fail; goto int13_success; break; case 0x4e: // // IBM/MS set hardware configuration // DMA, prefetch, PIO maximum not supported switch (GET_AL()) { case 0x01: case 0x03: case 0x04: case 0x06: goto int13_success; break; default: goto int13_fail; } break; case 0x09: /* initialize drive parameters */ case 0x0c: /* seek to specified cylinder */ case 0x0d: /* alternate disk reset */ case 0x11: /* recalibrate */ case 0x14: /* controller internal diagnostic */ BX_INFO("int13_harddisk: function %02xh unimplemented, returns success\n", GET_AH()); goto int13_success; break; case 0x0a: /* read disk sectors with ECC */ case 0x0b: /* write disk sectors with ECC */ case 0x18: // set media type for format case 0x50: // IBM/MS send packet command default: BX_INFO("int13_harddisk: function %02xh unsupported, returns fail\n", GET_AH()); goto int13_fail; break; } int13_fail: SET_AH(0x01); // defaults to invalid function in AH or invalid parameter int13_fail_noah: SET_DISK_RET_STATUS(GET_AH()); int13_fail_nostatus: SET_CF(); // error occurred return; int13_success: SET_AH(0x00); // no error int13_success_noah: SET_DISK_RET_STATUS(0x00); CLEAR_CF(); // no error } // --------------------------------------------------------------------------- // Start of int13 for cdrom // --------------------------------------------------------------------------- void int13_cdrom(EHBX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS) Bit16u EHBX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u device, status, locks; Bit8u atacmd[12]; Bit32u lba; Bit16u count, segment, offset, i, size; BX_DEBUG_INT13_CD("int13_cdrom: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", AX, BX, CX, DX, ES); SET_DISK_RET_STATUS(0x00); /* basic check : device should be 0xE0+ */ if( (GET_ELDL() < 0xE0) || (GET_ELDL() >= 0xE0+BX_MAX_ATA_DEVICES) ) { BX_INFO("int13_cdrom: function %02x, ELDL out of range %02x\n", GET_AH(), GET_ELDL()); goto int13_fail; } // Get the ata channel device=read_byte(ebda_seg,&EbdaData->ata.cdidmap[GET_ELDL()-0xE0]); /* basic check : device has to be valid */ if (device >= BX_MAX_ATA_DEVICES) { BX_INFO("int13_cdrom: function %02x, unmapped device for ELDL=%02x\n", GET_AH(), GET_ELDL()); goto int13_fail; } switch (GET_AH()) { // all those functions return SUCCESS case 0x00: /* disk controller reset */ case 0x09: /* initialize drive parameters */ case 0x0c: /* seek to specified cylinder */ case 0x0d: /* alternate disk reset */ case 0x10: /* check drive ready */ case 0x11: /* recalibrate */ case 0x14: /* controller internal diagnostic */ case 0x16: /* detect disk change */ goto int13_success; break; // all those functions return disk write-protected case 0x03: /* write disk sectors */ case 0x05: /* format disk track */ case 0x43: // IBM/MS extended write SET_AH(0x03); goto int13_fail_noah; break; case 0x01: /* read disk status */ status = read_byte(0x0040, 0x0074); SET_AH(status); SET_DISK_RET_STATUS(0); /* set CF if error status read */ if (status) goto int13_fail_nostatus; else goto int13_success_noah; break; case 0x15: /* read disk drive size */ SET_AH(0x02); goto int13_fail_noah; break; case 0x41: // IBM/MS installation check BX=0xaa55; // install check SET_AH(0x30); // EDD 2.1 CX=0x0007; // ext disk access, removable and edd goto int13_success_noah; break; case 0x42: // IBM/MS extended read case 0x44: // IBM/MS verify sectors case 0x47: // IBM/MS extended seek count=read_word(DS, SI+(Bit16u)&Int13Ext->count); segment=read_word(DS, SI+(Bit16u)&Int13Ext->segment); offset=read_word(DS, SI+(Bit16u)&Int13Ext->offset); // Can't use 64 bits lba lba=read_dword(DS, SI+(Bit16u)&Int13Ext->lba2); if (lba != 0L) { BX_PANIC("int13_cdrom: function %02x. Can't use 64bits lba\n",GET_AH()); goto int13_fail; } // Get 32 bits lba lba=read_dword(DS, SI+(Bit16u)&Int13Ext->lba1); // If verify or seek if ((GET_AH() == 0x44) || (GET_AH() == 0x47)) goto int13_success; memsetb(get_SS(),atacmd,0,12); atacmd[0]=0x28; // READ command atacmd[7]=(count & 0xff00) >> 8; // Sectors atacmd[8]=(count & 0x00ff); // Sectors atacmd[2]=(lba & 0xff000000) >> 24; // LBA atacmd[3]=(lba & 0x00ff0000) >> 16; atacmd[4]=(lba & 0x0000ff00) >> 8; atacmd[5]=(lba & 0x000000ff); status = ata_cmd_packet(device, 12, get_SS(), atacmd, 0, count*2048L, ATA_DATA_IN, segment,offset); count = (Bit16u)(read_dword(ebda_seg, &EbdaData->ata.trsfbytes) >> 11); write_word(DS, SI+(Bit16u)&Int13Ext->count, count); if (status != 0) { BX_INFO("int13_cdrom: function %02x, status %02x !\n",GET_AH(),status); SET_AH(0x0c); goto int13_fail_noah; } goto int13_success; break; case 0x45: // IBM/MS lock/unlock drive if (GET_AL() > 2) goto int13_fail; locks = read_byte(ebda_seg, &EbdaData->ata.devices[device].lock); switch (GET_AL()) { case 0 : // lock if (locks == 0xff) { SET_AH(0xb4); SET_AL(1); goto int13_fail_noah; } write_byte(ebda_seg, &EbdaData->ata.devices[device].lock, ++locks); SET_AL(1); break; case 1 : // unlock if (locks == 0x00) { SET_AH(0xb0); SET_AL(0); goto int13_fail_noah; } write_byte(ebda_seg, &EbdaData->ata.devices[device].lock, --locks); SET_AL(locks==0?0:1); break; case 2 : // status SET_AL(locks==0?0:1); break; } goto int13_success; break; case 0x46: // IBM/MS eject media locks = read_byte(ebda_seg, &EbdaData->ata.devices[device].lock); if (locks != 0) { SET_AH(0xb1); // media locked goto int13_fail_noah; } // FIXME should handle 0x31 no media in device // FIXME should handle 0xb5 valid request failed // Call removable media eject ASM_START push bp mov bp, sp mov ah, #0x52 int #0x15 mov _int13_cdrom.status + 2[bp], ah jnc int13_cdrom_rme_end mov _int13_cdrom.status, #1 int13_cdrom_rme_end: pop bp ASM_END if (status != 0) { SET_AH(0xb1); // media locked goto int13_fail_noah; } goto int13_success; break; case 0x48: // IBM/MS get drive parameters if (int13_edd(DS, SI, device)) goto int13_fail; goto int13_success; break; case 0x49: // IBM/MS extended media change // always send changed ?? SET_AH(06); goto int13_fail_nostatus; break; case 0x4e: // // IBM/MS set hardware configuration // DMA, prefetch, PIO maximum not supported switch (GET_AL()) { case 0x01: case 0x03: case 0x04: case 0x06: goto int13_success; break; default: goto int13_fail; } break; // all those functions return unimplemented case 0x02: /* read sectors */ case 0x04: /* verify sectors */ case 0x08: /* read disk drive parameters */ case 0x0a: /* read disk sectors with ECC */ case 0x0b: /* write disk sectors with ECC */ case 0x18: /* set media type for format */ case 0x50: // ? - send packet command default: BX_INFO("int13_cdrom: unsupported AH=%02x\n", GET_AH()); goto int13_fail; break; } int13_fail: SET_AH(0x01); // defaults to invalid function in AH or invalid parameter int13_fail_noah: SET_DISK_RET_STATUS(GET_AH()); int13_fail_nostatus: SET_CF(); // error occurred return; int13_success: SET_AH(0x00); // no error int13_success_noah: SET_DISK_RET_STATUS(0x00); CLEAR_CF(); // no error } // --------------------------------------------------------------------------- // End of int13 for cdrom // --------------------------------------------------------------------------- #if BX_ELTORITO_BOOT // --------------------------------------------------------------------------- // Start of int13 for eltorito functions // --------------------------------------------------------------------------- void int13_eltorito(DS, ES, DI, SI, BP, SP, BX, DX, CX, AX, IP, CS, FLAGS) Bit16u DS, ES, DI, SI, BP, SP, BX, DX, CX, AX, IP, CS, FLAGS; { Bit16u ebda_seg=read_word(0x0040,0x000E); BX_DEBUG_INT13_ET("int13_eltorito: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", AX, BX, CX, DX, ES); // BX_DEBUG_INT13_ET("int13_eltorito: SS=%04x DS=%04x ES=%04x DI=%04x SI=%04x\n",get_SS(), DS, ES, DI, SI); switch (GET_AH()) { // FIXME ElTorito Various. Should be implemented case 0x4a: // ElTorito - Initiate disk emu case 0x4c: // ElTorito - Initiate disk emu and boot case 0x4d: // ElTorito - Return Boot catalog BX_PANIC("Int13 eltorito call with AX=%04x. Please report\n",AX); goto int13_fail; break; case 0x4b: // ElTorito - Terminate disk emu // FIXME ElTorito Hardcoded write_byte(DS,SI+0x00,0x13); write_byte(DS,SI+0x01,read_byte(ebda_seg,&EbdaData->cdemu.media)); write_byte(DS,SI+0x02,read_byte(ebda_seg,&EbdaData->cdemu.emulated_drive)); write_byte(DS,SI+0x03,read_byte(ebda_seg,&EbdaData->cdemu.controller_index)); write_dword(DS,SI+0x04,read_dword(ebda_seg,&EbdaData->cdemu.ilba)); write_word(DS,SI+0x08,read_word(ebda_seg,&EbdaData->cdemu.device_spec)); write_word(DS,SI+0x0a,read_word(ebda_seg,&EbdaData->cdemu.buffer_segment)); write_word(DS,SI+0x0c,read_word(ebda_seg,&EbdaData->cdemu.load_segment)); write_word(DS,SI+0x0e,read_word(ebda_seg,&EbdaData->cdemu.sector_count)); write_byte(DS,SI+0x10,read_byte(ebda_seg,&EbdaData->cdemu.vdevice.cylinders)); write_byte(DS,SI+0x11,read_byte(ebda_seg,&EbdaData->cdemu.vdevice.spt)); write_byte(DS,SI+0x12,read_byte(ebda_seg,&EbdaData->cdemu.vdevice.heads)); // If we have to terminate emulation if(GET_AL() == 0x00) { // FIXME ElTorito Various. Should be handled accordingly to spec write_byte(ebda_seg,&EbdaData->cdemu.active, 0x00); // bye bye } goto int13_success; break; default: BX_INFO("int13_eltorito: unsupported AH=%02x\n", GET_AH()); goto int13_fail; break; } int13_fail: SET_AH(0x01); // defaults to invalid function in AH or invalid parameter SET_DISK_RET_STATUS(GET_AH()); SET_CF(); // error occurred return; int13_success: SET_AH(0x00); // no error SET_DISK_RET_STATUS(0x00); CLEAR_CF(); // no error } // --------------------------------------------------------------------------- // End of int13 for eltorito functions // --------------------------------------------------------------------------- // --------------------------------------------------------------------------- // Start of int13 when emulating a device from the cd // --------------------------------------------------------------------------- void int13_cdemu(DS, ES, DI, SI, BP, SP, BX, DX, CX, AX, IP, CS, FLAGS) Bit16u DS, ES, DI, SI, BP, SP, BX, DX, CX, AX, IP, CS, FLAGS; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit8u device, status; Bit16u vheads, vspt, vcylinders; Bit16u head, sector, cylinder, nbsectors; Bit32u vlba, ilba, slba, elba; Bit16u before, segment, offset; Bit8u atacmd[12]; BX_DEBUG_INT13_ET("int13_cdemu: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", AX, BX, CX, DX, ES); /* at this point, we are emulating a floppy/harddisk */ // Recompute the device number device = read_byte(ebda_seg,&EbdaData->cdemu.controller_index) * 2; device += read_byte(ebda_seg,&EbdaData->cdemu.device_spec); SET_DISK_RET_STATUS(0x00); /* basic checks : emulation should be active, dl should equal the emulated drive */ if( (read_byte(ebda_seg,&EbdaData->cdemu.active) ==0) || (read_byte(ebda_seg,&EbdaData->cdemu.emulated_drive ) != GET_DL())) { BX_INFO("int13_cdemu: function %02x, emulation not active for DL= %02x\n", GET_AH(), GET_DL()); goto int13_fail; } switch (GET_AH()) { // all those functions return SUCCESS case 0x00: /* disk controller reset */ case 0x09: /* initialize drive parameters */ case 0x0c: /* seek to specified cylinder */ case 0x0d: /* alternate disk reset */ // FIXME ElTorito Various. should really reset ? case 0x10: /* check drive ready */ // FIXME ElTorito Various. should check if ready ? case 0x11: /* recalibrate */ case 0x14: /* controller internal diagnostic */ case 0x16: /* detect disk change */ goto int13_success; break; // all those functions return disk write-protected case 0x03: /* write disk sectors */ case 0x05: /* format disk track */ SET_AH(0x03); goto int13_fail_noah; break; case 0x01: /* read disk status */ status=read_byte(0x0040, 0x0074); SET_AH(status); SET_DISK_RET_STATUS(0); /* set CF if error status read */ if (status) goto int13_fail_nostatus; else goto int13_success_noah; break; case 0x02: // read disk sectors case 0x04: // verify disk sectors vspt = read_word(ebda_seg,&EbdaData->cdemu.vdevice.spt); vcylinders = read_word(ebda_seg,&EbdaData->cdemu.vdevice.cylinders); vheads = read_word(ebda_seg,&EbdaData->cdemu.vdevice.heads); ilba = read_dword(ebda_seg,&EbdaData->cdemu.ilba); sector = GET_CL() & 0x003f; cylinder = (GET_CL() & 0x00c0) << 2 | GET_CH(); head = GET_DH(); nbsectors = GET_AL(); segment = ES; offset = BX; // no sector to read ? if(nbsectors==0) goto int13_success; // sanity checks sco openserver needs this! if ((sector > vspt) || (cylinder >= vcylinders) || (head >= vheads)) { goto int13_fail; } // After controls, verify do nothing if (GET_AH() == 0x04) goto int13_success; segment = ES+(BX / 16); offset = BX % 16; // calculate the virtual lba inside the image vlba=((((Bit32u)cylinder*(Bit32u)vheads)+(Bit32u)head)*(Bit32u)vspt)+((Bit32u)(sector-1)); // In advance so we don't loose the count SET_AL(nbsectors); // start lba on cd slba = (Bit32u)vlba/4; before= (Bit16u)vlba%4; // end lba on cd elba = (Bit32u)(vlba+nbsectors-1)/4; memsetb(get_SS(),atacmd,0,12); atacmd[0]=0x28; // READ command atacmd[7]=((Bit16u)(elba-slba+1) & 0xff00) >> 8; // Sectors atacmd[8]=((Bit16u)(elba-slba+1) & 0x00ff); // Sectors atacmd[2]=(ilba+slba & 0xff000000) >> 24; // LBA atacmd[3]=(ilba+slba & 0x00ff0000) >> 16; atacmd[4]=(ilba+slba & 0x0000ff00) >> 8; atacmd[5]=(ilba+slba & 0x000000ff); if((status = ata_cmd_packet(device, 12, get_SS(), atacmd, before*512, nbsectors*512L, ATA_DATA_IN, segment,offset)) != 0) { BX_INFO("int13_cdemu: function %02x, error %02x !\n",GET_AH(),status); SET_AH(0x02); SET_AL(0); goto int13_fail_noah; } goto int13_success; break; case 0x08: /* read disk drive parameters */ vspt=read_word(ebda_seg,&EbdaData->cdemu.vdevice.spt); vcylinders=read_word(ebda_seg,&EbdaData->cdemu.vdevice.cylinders) - 1; vheads=read_word(ebda_seg,&EbdaData->cdemu.vdevice.heads) - 1; SET_AL(0x00); SET_BL(0x00); SET_CH(vcylinders & 0xff); SET_CL(((vcylinders >> 2) & 0xc0) | (vspt & 0x3f)); SET_DH(vheads); SET_DL(0x02); // FIXME ElTorito Various. should send the real count of drives 1 or 2 // FIXME ElTorito Harddisk. should send the HD count switch(read_byte(ebda_seg,&EbdaData->cdemu.media)) { case 0x01: SET_BL( 0x02 ); break; case 0x02: SET_BL( 0x04 ); break; case 0x03: SET_BL( 0x06 ); break; } ASM_START push bp mov bp, sp mov ax, #diskette_param_table2 mov _int13_cdemu.DI+2[bp], ax mov _int13_cdemu.ES+2[bp], cs pop bp ASM_END goto int13_success; break; case 0x15: /* read disk drive size */ // FIXME ElTorito Harddisk. What geometry to send ? SET_AH(0x03); goto int13_success_noah; break; // all those functions return unimplemented case 0x0a: /* read disk sectors with ECC */ case 0x0b: /* write disk sectors with ECC */ case 0x18: /* set media type for format */ case 0x41: // IBM/MS installation check // FIXME ElTorito Harddisk. Darwin would like to use EDD case 0x42: // IBM/MS extended read case 0x43: // IBM/MS extended write case 0x44: // IBM/MS verify sectors case 0x45: // IBM/MS lock/unlock drive case 0x46: // IBM/MS eject media case 0x47: // IBM/MS extended seek case 0x48: // IBM/MS get drive parameters case 0x49: // IBM/MS extended media change case 0x4e: // ? - set hardware configuration case 0x50: // ? - send packet command default: BX_INFO("int13_cdemu function AH=%02x unsupported, returns fail\n", GET_AH()); goto int13_fail; break; } int13_fail: SET_AH(0x01); // defaults to invalid function in AH or invalid parameter int13_fail_noah: SET_DISK_RET_STATUS(GET_AH()); int13_fail_nostatus: SET_CF(); // error occurred return; int13_success: SET_AH(0x00); // no error int13_success_noah: SET_DISK_RET_STATUS(0x00); CLEAR_CF(); // no error } // --------------------------------------------------------------------------- // End of int13 when emulating a device from the cd // --------------------------------------------------------------------------- #endif // BX_ELTORITO_BOOT #else //BX_USE_ATADRV void outLBA(cylinder,hd_heads,head,hd_sectors,sector,dl) Bit16u cylinder; Bit16u hd_heads; Bit16u head; Bit16u hd_sectors; Bit16u sector; Bit16u dl; { ASM_START push bp mov bp, sp push eax push ebx push edx xor eax,eax mov ax,4[bp] // cylinder xor ebx,ebx mov bl,6[bp] // hd_heads imul ebx mov bl,8[bp] // head add eax,ebx mov bl,10[bp] // hd_sectors imul ebx mov bl,12[bp] // sector add eax,ebx dec eax mov dx,#0x1f3 out dx,al mov dx,#0x1f4 mov al,ah out dx,al shr eax,#16 mov dx,#0x1f5 out dx,al and ah,#0xf mov bl,14[bp] // dl and bl,#1 shl bl,#4 or ah,bl or ah,#0xe0 mov al,ah mov dx,#0x01f6 out dx,al pop edx pop ebx pop eax pop bp ASM_END } void int13_harddisk(EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS) Bit16u EHAX, DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS; { Bit8u drive, num_sectors, sector, head, status, mod; Bit8u drive_map; Bit8u n_drives; Bit16u cyl_mod, ax; Bit16u max_cylinder, cylinder, total_sectors; Bit16u hd_cylinders; Bit8u hd_heads, hd_sectors; Bit16u val16; Bit8u sector_count; unsigned int i; Bit16u tempbx; Bit16u dpsize; Bit16u count, segment, offset; Bit32u lba; Bit16u error; BX_DEBUG_INT13_HD("int13 harddisk: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", AX, BX, CX, DX, ES); write_byte(0x0040, 0x008e, 0); // clear completion flag /* at this point, DL is >= 0x80 to be passed from the floppy int13h handler code */ /* check how many disks first (cmos reg 0x12), return an error if drive not present */ drive_map = inb_cmos(0x12); drive_map = (((drive_map & 0xf0)==0) ? 0 : 1) | (((drive_map & 0x0f)==0) ? 0 : 2); n_drives = (drive_map==0) ? 0 : ((drive_map==3) ? 2 : 1); if (!(drive_map & (1<<(GET_ELDL()&0x7f)))) { /* allow 0, 1, or 2 disks */ SET_AH(0x01); SET_DISK_RET_STATUS(0x01); SET_CF(); /* error occurred */ return; } switch (GET_AH()) { case 0x00: /* disk controller reset */ BX_DEBUG_INT13_HD("int13_f00\n"); SET_AH(0); SET_DISK_RET_STATUS(0); set_diskette_ret_status(0); set_diskette_current_cyl(0, 0); /* current cylinder, diskette 1 */ set_diskette_current_cyl(1, 0); /* current cylinder, diskette 2 */ CLEAR_CF(); /* successful */ return; break; case 0x01: /* read disk status */ BX_DEBUG_INT13_HD("int13_f01\n"); status = read_byte(0x0040, 0x0074); SET_AH(status); SET_DISK_RET_STATUS(0); /* set CF if error status read */ if (status) SET_CF(); else CLEAR_CF(); return; break; case 0x04: // verify disk sectors case 0x02: // read disk sectors drive = GET_ELDL(); get_hd_geometry(drive, &hd_cylinders, &hd_heads, &hd_sectors); num_sectors = GET_AL(); cylinder = (GET_CL() & 0x00c0) << 2 | GET_CH(); sector = (GET_CL() & 0x3f); head = GET_DH(); if (hd_cylinders > 1024) { if (hd_cylinders <= 2048) { cylinder <<= 1; } else if (hd_cylinders <= 4096) { cylinder <<= 2; } else if (hd_cylinders <= 8192) { cylinder <<= 3; } else { // hd_cylinders <= 16384 cylinder <<= 4; } ax = head / hd_heads; cyl_mod = ax & 0xff; head = ax >> 8; cylinder |= cyl_mod; } if ( (cylinder >= hd_cylinders) || (sector > hd_sectors) || (head >= hd_heads) ) { SET_AH(1); SET_DISK_RET_STATUS(1); SET_CF(); /* error occurred */ return; } if ( (num_sectors > 128) || (num_sectors == 0) ) BX_PANIC("int13_harddisk: num_sectors out of range!\n"); if (head > 15) BX_PANIC("hard drive BIOS:(read/verify) head > 15\n"); if ( GET_AH() == 0x04 ) { SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); return; } status = inb(PORT_ATA1_CMD_BASE + 7); if (status & 0x80) { BX_PANIC("hard drive BIOS:(read/verify) BUSY bit set\n"); } outb(PORT_ATA1_CMD_BASE + 2, num_sectors); /* activate LBA? (tomv) */ if (hd_heads > 16) { BX_DEBUG_INT13_HD("CHS: %x %x %x\n", cylinder, head, sector); outLBA(cylinder,hd_heads,head,hd_sectors,sector,drive); } else { outb(PORT_ATA1_CMD_BASE + 3, sector); outb(PORT_ATA1_CMD_BASE + 4, cylinder & 0x00ff); outb(PORT_ATA1_CMD_BASE + 5, cylinder >> 8); outb(PORT_ATA1_CMD_BASE + 6, 0xa0 | ((drive & 0x01)<<4) | (head & 0x0f)); } outb(PORT_ATA1_CMD_BASE + 7, 0x20); while (1) { status = inb(PORT_ATA1_CMD_BASE + 7); if (!(status & 0x80)) break; } if (status & 0x01) { BX_PANIC("hard drive BIOS:(read/verify) read error\n"); } else if (!(status & 0x08)) { BX_DEBUG_INT13_HD("status was %02x\n", (unsigned) status); BX_PANIC("hard drive BIOS:(read/verify) expected DRQ=1\n"); } sector_count = 0; tempbx = BX; ASM_START sti ;; enable higher priority interrupts ASM_END while (1) { ASM_START ;; store temp bx in real DI register push bp mov bp, sp mov di, _int13_harddisk.tempbx + 2 [bp] pop bp ;; adjust if there will be an overrun cmp di, #0xfe00 jbe i13_f02_no_adjust i13_f02_adjust: sub di, #0x0200 ; sub 512 bytes from offset mov ax, es add ax, #0x0020 ; add 512 to segment mov es, ax i13_f02_no_adjust: mov cx, #0x0100 ;; counter (256 words = 512b) mov dx, #0x01f0 ;; AT data read port rep insw ;; CX words transferred from port(DX) to ES:[DI] i13_f02_done: ;; store real DI register back to temp bx push bp mov bp, sp mov _int13_harddisk.tempbx + 2 [bp], di pop bp ASM_END sector_count++; num_sectors--; if (num_sectors == 0) { status = inb(PORT_ATA1_CMD_BASE + 7); if ((status & 0xc9) != 0x40) BX_PANIC("no sectors left to read/verify, status is %02x\n", (unsigned) status); break; } else { status = inb(PORT_ATA1_CMD_BASE + 7); if ((status & 0xc9) != 0x48) BX_PANIC("more sectors left to read/verify, status is %02x\n", (unsigned) status); continue; } } SET_AH(0); SET_DISK_RET_STATUS(0); SET_AL(sector_count); CLEAR_CF(); /* successful */ return; break; case 0x03: /* write disk sectors */ BX_DEBUG_INT13_HD("int13_f03\n"); drive = GET_ELDL (); get_hd_geometry(drive, &hd_cylinders, &hd_heads, &hd_sectors); num_sectors = GET_AL(); cylinder = GET_CH(); cylinder |= ( ((Bit16u) GET_CL()) << 2) & 0x300; sector = (GET_CL() & 0x3f); head = GET_DH(); if (hd_cylinders > 1024) { if (hd_cylinders <= 2048) { cylinder <<= 1; } else if (hd_cylinders <= 4096) { cylinder <<= 2; } else if (hd_cylinders <= 8192) { cylinder <<= 3; } else { // hd_cylinders <= 16384 cylinder <<= 4; } ax = head / hd_heads; cyl_mod = ax & 0xff; head = ax >> 8; cylinder |= cyl_mod; } if ( (cylinder >= hd_cylinders) || (sector > hd_sectors) || (head >= hd_heads) ) { SET_AH(1); SET_DISK_RET_STATUS(1); SET_CF(); /* error occurred */ return; } if ( (num_sectors > 128) || (num_sectors == 0) ) BX_PANIC("int13_harddisk: num_sectors out of range!\n"); if (head > 15) BX_PANIC("hard drive BIOS:(read) head > 15\n"); status = inb(PORT_ATA1_CMD_BASE + 7); if (status & 0x80) { BX_PANIC("hard drive BIOS:(read) BUSY bit set\n"); } // should check for Drive Ready Bit also in status reg outb(PORT_ATA1_CMD_BASE + 2, num_sectors); /* activate LBA? (tomv) */ if (hd_heads > 16) { BX_DEBUG_INT13_HD("CHS (write): %x %x %x\n", cylinder, head, sector); outLBA(cylinder,hd_heads,head,hd_sectors,sector,GET_ELDL()); } else { outb(PORT_ATA1_CMD_BASE + 3, sector); outb(PORT_ATA1_CMD_BASE + 4, cylinder & 0x00ff); outb(PORT_ATA1_CMD_BASE + 5, cylinder >> 8); outb(PORT_ATA1_CMD_BASE + 6, 0xa0 | ((GET_ELDL() & 0x01)<<4) | (head & 0x0f)); } outb(PORT_ATA1_CMD_BASE + 7, 0x30); // wait for busy bit to turn off after seeking while (1) { status = inb(PORT_ATA1_CMD_BASE + 7); if (!(status & 0x80)) break; } if (!(status & 0x08)) { BX_DEBUG_INT13_HD("status was %02x\n", (unsigned) status); BX_PANIC("hard drive BIOS:(write) data-request bit not set\n"); } sector_count = 0; tempbx = BX; ASM_START sti ;; enable higher priority interrupts ASM_END while (1) { ASM_START ;; store temp bx in real SI register push bp mov bp, sp mov si, _int13_harddisk.tempbx + 2 [bp] pop bp ;; adjust if there will be an overrun cmp si, #0xfe00 jbe i13_f03_no_adjust i13_f03_adjust: sub si, #0x0200 ; sub 512 bytes from offset mov ax, es add ax, #0x0020 ; add 512 to segment mov es, ax i13_f03_no_adjust: mov cx, #0x0100 ;; counter (256 words = 512b) mov dx, #0x01f0 ;; AT data read port seg ES rep outsw ;; CX words tranferred from ES:[SI] to port(DX) ;; store real SI register back to temp bx push bp mov bp, sp mov _int13_harddisk.tempbx + 2 [bp], si pop bp ASM_END sector_count++; num_sectors--; if (num_sectors == 0) { status = inb(PORT_ATA1_CMD_BASE + 7); if ((status & 0xe9) != 0x40) BX_PANIC("no sectors left to write, status is %02x\n", (unsigned) status); break; } else { status = inb(PORT_ATA1_CMD_BASE + 7); if ((status & 0xc9) != 0x48) BX_PANIC("more sectors left to write, status is %02x\n", (unsigned) status); continue; } } SET_AH(0); SET_DISK_RET_STATUS(0); SET_AL(sector_count); CLEAR_CF(); /* successful */ return; break; case 0x05: /* format disk track */ BX_DEBUG_INT13_HD("int13_f05\n"); BX_PANIC("format disk track called\n"); /* nop */ SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); /* successful */ return; break; case 0x08: /* read disk drive parameters */ BX_DEBUG_INT13_HD("int13_f08\n"); drive = GET_ELDL (); get_hd_geometry(drive, &hd_cylinders, &hd_heads, &hd_sectors); // translate CHS // if (hd_cylinders <= 1024) { // hd_cylinders >>= 0; // hd_heads <<= 0; } else if (hd_cylinders <= 2048) { hd_cylinders >>= 1; hd_heads <<= 1; } else if (hd_cylinders <= 4096) { hd_cylinders >>= 2; hd_heads <<= 2; } else if (hd_cylinders <= 8192) { hd_cylinders >>= 3; hd_heads <<= 3; } else { // hd_cylinders <= 16384 hd_cylinders >>= 4; hd_heads <<= 4; } max_cylinder = hd_cylinders - 1; /* 0 based */ SET_AL(0); SET_CH(max_cylinder & 0xff); SET_CL(((max_cylinder >> 2) & 0xc0) | (hd_sectors & 0x3f)); SET_DH(hd_heads - 1); SET_DL(n_drives); /* returns 0, 1, or 2 hard drives */ SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); /* successful */ return; break; case 0x09: /* initialize drive parameters */ BX_DEBUG_INT13_HD("int13_f09\n"); SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); /* successful */ return; break; case 0x0a: /* read disk sectors with ECC */ BX_DEBUG_INT13_HD("int13_f0a\n"); case 0x0b: /* write disk sectors with ECC */ BX_DEBUG_INT13_HD("int13_f0b\n"); BX_PANIC("int13h Functions 0Ah & 0Bh not implemented!\n"); return; break; case 0x0c: /* seek to specified cylinder */ BX_DEBUG_INT13_HD("int13_f0c\n"); BX_INFO("int13h function 0ch (seek) not implemented!\n"); SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); /* successful */ return; break; case 0x0d: /* alternate disk reset */ BX_DEBUG_INT13_HD("int13_f0d\n"); SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); /* successful */ return; break; case 0x10: /* check drive ready */ BX_DEBUG_INT13_HD("int13_f10\n"); //SET_AH(0); //SET_DISK_RET_STATUS(0); //CLEAR_CF(); /* successful */ //return; //break; // should look at 40:8E also??? status = inb(PORT_ATA1_CMD_BASE + 7); if ((status & 0xc0) == 0x40) { SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); // drive ready return; } else { SET_AH(0xAA); SET_DISK_RET_STATUS(0xAA); SET_CF(); // not ready return; } break; case 0x11: /* recalibrate */ BX_DEBUG_INT13_HD("int13_f11\n"); SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); /* successful */ return; break; case 0x14: /* controller internal diagnostic */ BX_DEBUG_INT13_HD("int13_f14\n"); SET_AH(0); SET_DISK_RET_STATUS(0); CLEAR_CF(); /* successful */ SET_AL(0); return; break; case 0x15: /* read disk drive size */ drive = GET_ELDL(); get_hd_geometry(drive, &hd_cylinders, &hd_heads, &hd_sectors); ASM_START push bp mov bp, sp mov al, _int13_harddisk.hd_heads + 2 [bp] mov ah, _int13_harddisk.hd_sectors + 2 [bp] mul al, ah ;; ax = heads * sectors mov bx, _int13_harddisk.hd_cylinders + 2 [bp] dec bx ;; use (cylinders - 1) ??? mul ax, bx ;; dx:ax = (cylinders -1) * (heads * sectors) ;; now we need to move the 32bit result dx:ax to what the ;; BIOS wants which is cx:dx. ;; and then into CX:DX on the stack mov _int13_harddisk.CX + 2 [bp], dx mov _int13_harddisk.DX + 2 [bp], ax pop bp ASM_END SET_AH(3); // hard disk accessible SET_DISK_RET_STATUS(0); // ??? should this be 0 CLEAR_CF(); // successful return; break; case 0x18: // set media type for format case 0x41: // IBM/MS case 0x42: // IBM/MS case 0x43: // IBM/MS case 0x44: // IBM/MS case 0x45: // IBM/MS lock/unlock drive case 0x46: // IBM/MS eject media case 0x47: // IBM/MS extended seek case 0x49: // IBM/MS extended media change case 0x50: // IBM/MS send packet command default: BX_INFO("int13_harddisk: unsupported AH=%02x\n", GET_AH()); SET_AH(1); // code=invalid function in AH or invalid parameter SET_DISK_RET_STATUS(1); SET_CF(); /* unsuccessful */ return; } } static char panic_msg_reg12h[] = "HD%d cmos reg 12h not type F\n"; static char panic_msg_reg19h[] = "HD%d cmos reg %02xh not user definable type 47\n"; void get_hd_geometry(drive, hd_cylinders, hd_heads, hd_sectors) Bit8u drive; Bit16u *hd_cylinders; Bit8u *hd_heads; Bit8u *hd_sectors; { Bit8u hd_type; Bit16u ss; Bit16u cylinders; Bit8u iobase; ss = get_SS(); if (drive == 0x80) { hd_type = inb_cmos(0x12) & 0xf0; if (hd_type != 0xf0) BX_INFO(panic_msg_reg12h,0); hd_type = inb_cmos(0x19); // HD0: extended type if (hd_type != 47) BX_INFO(panic_msg_reg19h,0,0x19); iobase = 0x1b; } else { hd_type = inb_cmos(0x12) & 0x0f; if (hd_type != 0x0f) BX_INFO(panic_msg_reg12h,1); hd_type = inb_cmos(0x1a); // HD1: extended type if (hd_type != 47) BX_INFO(panic_msg_reg19h,0,0x1a); iobase = 0x24; } // cylinders cylinders = inb_cmos(iobase) | (inb_cmos(iobase+1) << 8); write_word(ss, hd_cylinders, cylinders); // heads write_byte(ss, hd_heads, inb_cmos(iobase+2)); // sectors per track write_byte(ss, hd_sectors, inb_cmos(iobase+8)); } #endif //else BX_USE_ATADRV #if BX_SUPPORT_FLOPPY ////////////////////// // FLOPPY functions // ////////////////////// void floppy_reset_controller() { Bit8u val8; // Reset controller val8 = inb(PORT_FD_DOR); outb(PORT_FD_DOR, val8 & ~0x04); outb(PORT_FD_DOR, val8 | 0x04); // Wait for controller to come out of reset do { val8 = inb(PORT_FD_STATUS); } while ((val8 & 0xc0) != 0x80); } void floppy_prepare_controller(drive) Bit16u drive; { Bit8u val8, dor, prev_reset; // set 40:3e bit 7 to 0 val8 = read_byte(0x0040, 0x003e); val8 &= 0x7f; write_byte(0x0040, 0x003e, val8); // turn on motor of selected drive, DMA & int enabled, normal operation prev_reset = inb(PORT_FD_DOR) & 0x04; if (drive) dor = 0x20; else dor = 0x10; dor |= 0x0c; dor |= drive; outb(PORT_FD_DOR, dor); // reset the disk motor timeout value of INT 08 write_byte(0x40,0x40, BX_FLOPPY_ON_CNT); // wait for drive readiness do { val8 = inb(PORT_FD_STATUS); } while ( (val8 & 0xc0) != 0x80 ); if (prev_reset == 0) { // turn on interrupts ASM_START sti ASM_END // wait on 40:3e bit 7 to become 1 do { val8 = read_byte(0x0040, 0x003e); } while ( (val8 & 0x80) == 0 ); val8 &= 0x7f; ASM_START cli ASM_END write_byte(0x0040, 0x003e, val8); } } bx_bool floppy_media_known(drive) Bit16u drive; { Bit8u val8; Bit16u media_state_offset; val8 = read_byte(0x0040, 0x003e); // diskette recal status if (drive) val8 >>= 1; val8 &= 0x01; if (val8 == 0) return(0); media_state_offset = 0x0090; if (drive) media_state_offset += 1; val8 = read_byte(0x0040, media_state_offset); val8 = (val8 >> 4) & 0x01; if (val8 == 0) return(0); // check pass, return KNOWN return(1); } bx_bool floppy_media_sense(drive) Bit16u drive; { bx_bool retval; Bit16u media_state_offset; Bit8u drive_type, config_data, media_state; if (floppy_drive_recal(drive) == 0) { return(0); } // for now cheat and get drive type from CMOS, // assume media is same as drive type // ** config_data ** // Bitfields for diskette media control: // Bit(s) Description (Table M0028) // 7-6 last data rate set by controller // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps // 5-4 last diskette drive step rate selected // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah // 3-2 {data rate at start of operation} // 1-0 reserved // ** media_state ** // Bitfields for diskette drive media state: // Bit(s) Description (Table M0030) // 7-6 data rate // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps // 5 double stepping required (e.g. 360kB in 1.2MB) // 4 media type established // 3 drive capable of supporting 4MB media // 2-0 on exit from BIOS, contains // 000 trying 360kB in 360kB // 001 trying 360kB in 1.2MB // 010 trying 1.2MB in 1.2MB // 011 360kB in 360kB established // 100 360kB in 1.2MB established // 101 1.2MB in 1.2MB established // 110 reserved // 111 all other formats/drives drive_type = inb_cmos(0x10); if (drive == 0) drive_type >>= 4; else drive_type &= 0x0f; if (drive_type == 1) { // 360K 5.25" drive config_data = 0x00; // 0000 0000 media_state = 0x25; // 0010 0101 retval = 1; } else if (drive_type == 2) { // 1.2 MB 5.25" drive config_data = 0x00; // 0000 0000 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5) retval = 1; } else if (drive_type == 3) { // 720K 3.5" drive config_data = 0x00; // 0000 0000 ??? media_state = 0x17; // 0001 0111 retval = 1; } else if (drive_type == 4) { // 1.44 MB 3.5" drive config_data = 0x00; // 0000 0000 media_state = 0x17; // 0001 0111 retval = 1; } else if (drive_type == 5) { // 2.88 MB 3.5" drive config_data = 0xCC; // 1100 1100 media_state = 0xD7; // 1101 0111 retval = 1; } // Extended floppy size uses special cmos setting else if (drive_type == 6) { // 160k 5.25" drive config_data = 0x00; // 0000 0000 media_state = 0x27; // 0010 0111 retval = 1; } else if (drive_type == 7) { // 180k 5.25" drive config_data = 0x00; // 0000 0000 media_state = 0x27; // 0010 0111 retval = 1; } else if (drive_type == 8) { // 320k 5.25" drive config_data = 0x00; // 0000 0000 media_state = 0x27; // 0010 0111 retval = 1; } else { // not recognized config_data = 0x00; // 0000 0000 media_state = 0x00; // 0000 0000 retval = 0; } if (drive == 0) media_state_offset = 0x90; else media_state_offset = 0x91; write_byte(0x0040, 0x008B, config_data); write_byte(0x0040, media_state_offset, media_state); return(retval); } bx_bool floppy_drive_recal(drive) Bit16u drive; { Bit8u val8; Bit16u curr_cyl_offset; floppy_prepare_controller(drive); // send Recalibrate command (2 bytes) to controller outb(PORT_FD_DATA, 0x07); // 07: Recalibrate outb(PORT_FD_DATA, drive); // 0=drive0, 1=drive1 // turn on interrupts ASM_START sti ASM_END // wait on 40:3e bit 7 to become 1 do { val8 = (read_byte(0x0040, 0x003e) & 0x80); } while ( val8 == 0 ); val8 = 0; // separate asm from while() loop // turn off interrupts ASM_START cli ASM_END // set 40:3e bit 7 to 0, and calibrated bit val8 = read_byte(0x0040, 0x003e); val8 &= 0x7f; if (drive) { val8 |= 0x02; // Drive 1 calibrated curr_cyl_offset = 0x0095; } else { val8 |= 0x01; // Drive 0 calibrated curr_cyl_offset = 0x0094; } write_byte(0x0040, 0x003e, val8); write_byte(0x0040, curr_cyl_offset, 0); // current cylinder is 0 return(1); } bx_bool floppy_drive_exists(drive) Bit16u drive; { Bit8u drive_type; // check CMOS to see if drive exists drive_type = inb_cmos(0x10); if (drive == 0) drive_type >>= 4; else drive_type &= 0x0f; if ( drive_type == 0 ) return(0); else return(1); } void int13_diskette_function(DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS) Bit16u DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS; { Bit8u drive, num_sectors, track, sector, head, status; Bit16u base_address, base_count, base_es; Bit8u page, mode_register, val8, dor; Bit8u return_status[7]; Bit8u drive_type, num_floppies, ah, spt; Bit16u es, last_addr, maxCyl; BX_DEBUG_INT13_FL("int13_diskette: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", AX, BX, CX, DX, ES); ah = GET_AH(); switch ( ah ) { case 0x00: // diskette controller reset BX_DEBUG_INT13_FL("floppy f00\n"); drive = GET_ELDL(); if (drive > 1) { SET_AH(1); // invalid param set_diskette_ret_status(1); SET_CF(); return; } drive_type = inb_cmos(0x10); if (drive == 0) drive_type >>= 4; else drive_type &= 0x0f; if (drive_type == 0) { SET_AH(0x80); // drive not responding set_diskette_ret_status(0x80); SET_CF(); return; } SET_AH(0); set_diskette_ret_status(0); CLEAR_CF(); // successful set_diskette_current_cyl(drive, 0); // current cylinder return; case 0x01: // Read Diskette Status CLEAR_CF(); val8 = read_byte(0x0000, 0x0441); SET_AH(val8); if (val8) { SET_CF(); } return; case 0x02: // Read Diskette Sectors case 0x03: // Write Diskette Sectors case 0x04: // Verify Diskette Sectors num_sectors = GET_AL(); track = GET_CH(); sector = GET_CL(); head = GET_DH(); drive = GET_ELDL(); if ((drive > 1) || (head > 1) || (sector == 0) || (num_sectors == 0) || (num_sectors > 72)) { BX_INFO("int13_diskette: read/write/verify: parameter out of range\n"); SET_AH(1); set_diskette_ret_status(1); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } // see if drive exists if (floppy_drive_exists(drive) == 0) { SET_AH(0x80); // not responding set_diskette_ret_status(0x80); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } // see if media in drive, and type is known if (floppy_media_known(drive) == 0) { if (floppy_media_sense(drive) == 0) { SET_AH(0x0C); // Media type not found set_diskette_ret_status(0x0C); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } } if (ah == 0x02) { // Read Diskette Sectors //----------------------------------- // set up DMA controller for transfer //----------------------------------- // es:bx = pointer to where to place information from diskette // port 04: DMA-1 base and current address, channel 2 // port 05: DMA-1 base and current count, channel 2 page = (ES >> 12); // upper 4 bits base_es = (ES << 4); // lower 16bits contributed by ES base_address = base_es + BX; // lower 16 bits of address // contributed by ES:BX if ( base_address < base_es ) { // in case of carry, adjust page by 1 page++; } base_count = (num_sectors * 512) - 1; // check for 64K boundary overrun last_addr = base_address + base_count; if (last_addr < base_address) { SET_AH(0x09); set_diskette_ret_status(0x09); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } BX_DEBUG_INT13_FL("masking DMA-1 c2\n"); outb(PORT_DMA1_MASK_REG, 0x06); BX_DEBUG_INT13_FL("clear flip-flop\n"); outb(PORT_DMA1_CLEAR_FF_REG, 0x00); // clear flip-flop outb(PORT_DMA_ADDR_2, base_address); outb(PORT_DMA_ADDR_2, base_address>>8); BX_DEBUG_INT13_FL("clear flip-flop\n"); outb(PORT_DMA1_CLEAR_FF_REG, 0x00); // clear flip-flop outb(PORT_DMA_CNT_2, base_count); outb(PORT_DMA_CNT_2, base_count>>8); // port 0b: DMA-1 Mode Register mode_register = 0x46; // single mode, increment, autoinit disable, // transfer type=write, channel 2 BX_DEBUG_INT13_FL("setting mode register\n"); outb(PORT_DMA1_MODE_REG, mode_register); BX_DEBUG_INT13_FL("setting page register\n"); // port 81: DMA-1 Page Register, channel 2 outb(PORT_DMA_PAGE_2, page); BX_DEBUG_INT13_FL("unmask chan 2\n"); outb(PORT_DMA1_MASK_REG, 0x02); // unmask channel 2 BX_DEBUG_INT13_FL("unmasking DMA-1 c2\n"); outb(PORT_DMA1_MASK_REG, 0x02); //-------------------------------------- // set up floppy controller for transfer //-------------------------------------- floppy_prepare_controller(drive); // send read-normal-data command (9 bytes) to controller outb(PORT_FD_DATA, 0xe6); // e6: read normal data outb(PORT_FD_DATA, (head << 2) | drive); // HD DR1 DR2 outb(PORT_FD_DATA, track); outb(PORT_FD_DATA, head); outb(PORT_FD_DATA, sector); outb(PORT_FD_DATA, 2); // 512 byte sector size outb(PORT_FD_DATA, sector + num_sectors - 1); // last sector to read on track outb(PORT_FD_DATA, 0); // Gap length outb(PORT_FD_DATA, 0xff); // Gap length // turn on interrupts ASM_START sti ASM_END // wait on 40:3e bit 7 to become 1 do { val8 = read_byte(0x0040, 0x0040); if (val8 == 0) { floppy_reset_controller(); SET_AH(0x80); // drive not ready (timeout) set_diskette_ret_status(0x80); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } val8 = (read_byte(0x0040, 0x003e) & 0x80); } while ( val8 == 0 ); val8 = 0; // separate asm from while() loop // turn off interrupts ASM_START cli ASM_END // set 40:3e bit 7 to 0 val8 = read_byte(0x0040, 0x003e); val8 &= 0x7f; write_byte(0x0040, 0x003e, val8); // check port 3f4 for accessibility to status bytes val8 = inb(PORT_FD_STATUS); if ( (val8 & 0xc0) != 0xc0 ) BX_PANIC("int13_diskette: ctrl not ready\n"); // read 7 return status bytes from controller // using loop index broken, have to unroll... return_status[0] = inb(PORT_FD_DATA); return_status[1] = inb(PORT_FD_DATA); return_status[2] = inb(PORT_FD_DATA); return_status[3] = inb(PORT_FD_DATA); return_status[4] = inb(PORT_FD_DATA); return_status[5] = inb(PORT_FD_DATA); return_status[6] = inb(PORT_FD_DATA); // record in BIOS Data Area write_byte(0x0040, 0x0042, return_status[0]); write_byte(0x0040, 0x0043, return_status[1]); write_byte(0x0040, 0x0044, return_status[2]); write_byte(0x0040, 0x0045, return_status[3]); write_byte(0x0040, 0x0046, return_status[4]); write_byte(0x0040, 0x0047, return_status[5]); write_byte(0x0040, 0x0048, return_status[6]); if ( (return_status[0] & 0xc0) != 0 ) { SET_AH(0x20); set_diskette_ret_status(0x20); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } // ??? should track be new val from return_status[3] ? set_diskette_current_cyl(drive, track); // AL = number of sectors read (same value as passed) SET_AH(0x00); // success CLEAR_CF(); // success return; } else if (ah == 0x03) { // Write Diskette Sectors //----------------------------------- // set up DMA controller for transfer //----------------------------------- // es:bx = pointer to where to place information from diskette // port 04: DMA-1 base and current address, channel 2 // port 05: DMA-1 base and current count, channel 2 page = (ES >> 12); // upper 4 bits base_es = (ES << 4); // lower 16bits contributed by ES base_address = base_es + BX; // lower 16 bits of address // contributed by ES:BX if ( base_address < base_es ) { // in case of carry, adjust page by 1 page++; } base_count = (num_sectors * 512) - 1; // check for 64K boundary overrun last_addr = base_address + base_count; if (last_addr < base_address) { SET_AH(0x09); set_diskette_ret_status(0x09); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } BX_DEBUG_INT13_FL("masking DMA-1 c2\n"); outb(PORT_DMA1_MASK_REG, 0x06); outb(PORT_DMA1_CLEAR_FF_REG, 0x00); // clear flip-flop outb(PORT_DMA_ADDR_2, base_address); outb(PORT_DMA_ADDR_2, base_address>>8); outb(PORT_DMA1_CLEAR_FF_REG, 0x00); // clear flip-flop outb(PORT_DMA_CNT_2, base_count); outb(PORT_DMA_CNT_2, base_count>>8); // port 0b: DMA-1 Mode Register mode_register = 0x4a; // single mode, increment, autoinit disable, // transfer type=read, channel 2 outb(PORT_DMA1_MODE_REG, mode_register); // port 81: DMA-1 Page Register, channel 2 outb(PORT_DMA_PAGE_2, page); BX_DEBUG_INT13_FL("unmasking DMA-1 c2\n"); outb(PORT_DMA1_MASK_REG, 0x02); //-------------------------------------- // set up floppy controller for transfer //-------------------------------------- floppy_prepare_controller(drive); // send write-normal-data command (9 bytes) to controller outb(PORT_FD_DATA, 0xc5); // c5: write normal data outb(PORT_FD_DATA, (head << 2) | drive); // HD DR1 DR2 outb(PORT_FD_DATA, track); outb(PORT_FD_DATA, head); outb(PORT_FD_DATA, sector); outb(PORT_FD_DATA, 2); // 512 byte sector size outb(PORT_FD_DATA, sector + num_sectors - 1); // last sector to write on track outb(PORT_FD_DATA, 0); // Gap length outb(PORT_FD_DATA, 0xff); // Gap length // turn on interrupts ASM_START sti ASM_END // wait on 40:3e bit 7 to become 1 do { val8 = read_byte(0x0040, 0x0040); if (val8 == 0) { floppy_reset_controller(); SET_AH(0x80); // drive not ready (timeout) set_diskette_ret_status(0x80); SET_AL(0); // no sectors written SET_CF(); // error occurred return; } val8 = (read_byte(0x0040, 0x003e) & 0x80); } while ( val8 == 0 ); val8 = 0; // separate asm from while() loop // turn off interrupts ASM_START cli ASM_END // set 40:3e bit 7 to 0 val8 = read_byte(0x0040, 0x003e); val8 &= 0x7f; write_byte(0x0040, 0x003e, val8); // check port 3f4 for accessibility to status bytes val8 = inb(PORT_FD_STATUS); if ( (val8 & 0xc0) != 0xc0 ) BX_PANIC("int13_diskette: ctrl not ready\n"); // read 7 return status bytes from controller // using loop index broken, have to unroll... return_status[0] = inb(PORT_FD_DATA); return_status[1] = inb(PORT_FD_DATA); return_status[2] = inb(PORT_FD_DATA); return_status[3] = inb(PORT_FD_DATA); return_status[4] = inb(PORT_FD_DATA); return_status[5] = inb(PORT_FD_DATA); return_status[6] = inb(PORT_FD_DATA); // record in BIOS Data Area write_byte(0x0040, 0x0042, return_status[0]); write_byte(0x0040, 0x0043, return_status[1]); write_byte(0x0040, 0x0044, return_status[2]); write_byte(0x0040, 0x0045, return_status[3]); write_byte(0x0040, 0x0046, return_status[4]); write_byte(0x0040, 0x0047, return_status[5]); write_byte(0x0040, 0x0048, return_status[6]); if ( (return_status[0] & 0xc0) != 0 ) { if ( (return_status[1] & 0x02) != 0 ) { // diskette not writable. // AH=status code=0x03 (tried to write on write-protected disk) // AL=number of sectors written=0 AX = 0x0300; SET_CF(); return; } else { BX_PANIC("int13_diskette_function: read error\n"); } } // ??? should track be new val from return_status[3] ? set_diskette_current_cyl(drive, track); // AL = number of sectors read (same value as passed) SET_AH(0x00); // success CLEAR_CF(); // success return; } else { // if (ah == 0x04) // Verify Diskette Sectors // ??? should track be new val from return_status[3] ? set_diskette_current_cyl(drive, track); // AL = number of sectors verified (same value as passed) CLEAR_CF(); // success SET_AH(0x00); // success return; } break; case 0x05: // format diskette track BX_DEBUG_INT13_FL("floppy f05\n"); num_sectors = GET_AL(); track = GET_CH(); head = GET_DH(); drive = GET_ELDL(); if ((drive > 1) || (head > 1) || (track > 79) || (num_sectors == 0) || (num_sectors > 18)) { SET_AH(1); set_diskette_ret_status(1); SET_CF(); // error occurred } // see if drive exists if (floppy_drive_exists(drive) == 0) { SET_AH(0x80); // drive not responding set_diskette_ret_status(0x80); SET_CF(); // error occurred return; } // see if media in drive, and type is known if (floppy_media_known(drive) == 0) { if (floppy_media_sense(drive) == 0) { SET_AH(0x0C); // Media type not found set_diskette_ret_status(0x0C); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } } // set up DMA controller for transfer page = (ES >> 12); // upper 4 bits base_es = (ES << 4); // lower 16bits contributed by ES base_address = base_es + BX; // lower 16 bits of address // contributed by ES:BX if ( base_address < base_es ) { // in case of carry, adjust page by 1 page++; } base_count = (num_sectors * 4) - 1; // check for 64K boundary overrun last_addr = base_address + base_count; if (last_addr < base_address) { SET_AH(0x09); set_diskette_ret_status(0x09); SET_AL(0); // no sectors read SET_CF(); // error occurred return; } outb(PORT_DMA1_MASK_REG, 0x06); outb(PORT_DMA1_CLEAR_FF_REG, 0x00); // clear flip-flop outb(PORT_DMA_ADDR_2, base_address); outb(PORT_DMA_ADDR_2, base_address>>8); outb(PORT_DMA1_CLEAR_FF_REG, 0x00); // clear flip-flop outb(PORT_DMA_CNT_2, base_count); outb(PORT_DMA_CNT_2, base_count>>8); mode_register = 0x4a; // single mode, increment, autoinit disable, // transfer type=read, channel 2 outb(PORT_DMA1_MODE_REG, mode_register); // port 81: DMA-1 Page Register, channel 2 outb(PORT_DMA_PAGE_2, page); outb(PORT_DMA1_MASK_REG, 0x02); // set up floppy controller for transfer floppy_prepare_controller(drive); // send format-track command (6 bytes) to controller outb(PORT_FD_DATA, 0x4d); // 4d: format track outb(PORT_FD_DATA, (head << 2) | drive); // HD DR1 DR2 outb(PORT_FD_DATA, 2); // 512 byte sector size outb(PORT_FD_DATA, num_sectors); // number of sectors per track outb(PORT_FD_DATA, 0); // Gap length outb(PORT_FD_DATA, 0xf6); // Fill byte // turn on interrupts ASM_START sti ASM_END // wait on 40:3e bit 7 to become 1 do { val8 = read_byte(0x0040, 0x0040); if (val8 == 0) { floppy_reset_controller(); SET_AH(0x80); // drive not ready (timeout) set_diskette_ret_status(0x80); SET_CF(); // error occurred return; } val8 = (read_byte(0x0040, 0x003e) & 0x80); } while ( val8 == 0 ); val8 = 0; // separate asm from while() loop // turn off interrupts ASM_START cli ASM_END // set 40:3e bit 7 to 0 val8 = read_byte(0x0040, 0x003e); val8 &= 0x7f; write_byte(0x0040, 0x003e, val8); // check port 3f4 for accessibility to status bytes val8 = inb(PORT_FD_STATUS); if ( (val8 & 0xc0) != 0xc0 ) BX_PANIC("int13_diskette: ctrl not ready\n"); // read 7 return status bytes from controller // using loop index broken, have to unroll... return_status[0] = inb(PORT_FD_DATA); return_status[1] = inb(PORT_FD_DATA); return_status[2] = inb(PORT_FD_DATA); return_status[3] = inb(PORT_FD_DATA); return_status[4] = inb(PORT_FD_DATA); return_status[5] = inb(PORT_FD_DATA); return_status[6] = inb(PORT_FD_DATA); // record in BIOS Data Area write_byte(0x0040, 0x0042, return_status[0]); write_byte(0x0040, 0x0043, return_status[1]); write_byte(0x0040, 0x0044, return_status[2]); write_byte(0x0040, 0x0045, return_status[3]); write_byte(0x0040, 0x0046, return_status[4]); write_byte(0x0040, 0x0047, return_status[5]); write_byte(0x0040, 0x0048, return_status[6]); if ( (return_status[0] & 0xc0) != 0 ) { if ( (return_status[1] & 0x02) != 0 ) { // diskette not writable. // AH=status code=0x03 (tried to write on write-protected disk) // AL=number of sectors written=0 AX = 0x0300; SET_CF(); return; } else { BX_PANIC("int13_diskette_function: write error\n"); } } SET_AH(0); set_diskette_ret_status(0); set_diskette_current_cyl(drive, 0); CLEAR_CF(); // successful return; case 0x08: // read diskette drive parameters BX_DEBUG_INT13_FL("floppy f08\n"); drive = GET_ELDL(); if (drive > 1) { AX = 0; BX = 0; CX = 0; DX = 0; ES = 0; DI = 0; SET_DL(num_floppies); SET_CF(); return; } drive_type = inb_cmos(0x10); num_floppies = 0; if (drive_type & 0xf0) num_floppies++; if (drive_type & 0x0f) num_floppies++; if (drive == 0) drive_type >>= 4; else drive_type &= 0x0f; SET_BH(0); SET_BL(drive_type); SET_AH(0); SET_AL(0); SET_DL(num_floppies); switch (drive_type) { case 0: // none CX = 0; SET_DH(0); // max head # break; case 1: // 360KB, 5.25" CX = 0x2709; // 40 tracks, 9 sectors SET_DH(1); // max head # break; case 2: // 1.2MB, 5.25" CX = 0x4f0f; // 80 tracks, 15 sectors SET_DH(1); // max head # break; case 3: // 720KB, 3.5" CX = 0x4f09; // 80 tracks, 9 sectors SET_DH(1); // max head # break; case 4: // 1.44MB, 3.5" CX = 0x4f12; // 80 tracks, 18 sectors SET_DH(1); // max head # break; case 5: // 2.88MB, 3.5" CX = 0x4f24; // 80 tracks, 36 sectors SET_DH(1); // max head # break; case 6: // 160k, 5.25" CX = 0x2708; // 40 tracks, 8 sectors SET_DH(0); // max head # break; case 7: // 180k, 5.25" CX = 0x2709; // 40 tracks, 9 sectors SET_DH(0); // max head # break; case 8: // 320k, 5.25" CX = 0x2708; // 40 tracks, 8 sectors SET_DH(1); // max head # break; default: // ? BX_PANIC("floppy: int13: bad floppy type\n"); } /* set es & di to point to 11 byte diskette param table in ROM */ ASM_START push bp mov bp, sp mov ax, #diskette_param_table2 mov _int13_diskette_function.DI+2[bp], ax mov _int13_diskette_function.ES+2[bp], cs pop bp ASM_END CLEAR_CF(); // success /* disk status not changed upon success */ return; case 0x15: // read diskette drive type BX_DEBUG_INT13_FL("floppy f15\n"); drive = GET_ELDL(); if (drive > 1) { SET_AH(0); // only 2 drives supported // set_diskette_ret_status here ??? SET_CF(); return; } drive_type = inb_cmos(0x10); if (drive == 0) drive_type >>= 4; else drive_type &= 0x0f; CLEAR_CF(); // successful, not present if (drive_type==0) { SET_AH(0); // drive not present } else { SET_AH(1); // drive present, does not support change line } return; case 0x16: // get diskette change line status BX_DEBUG_INT13_FL("floppy f16\n"); drive = GET_ELDL(); if (drive > 1) { SET_AH(0x01); // invalid drive set_diskette_ret_status(0x01); SET_CF(); return; } SET_AH(0x06); // change line not supported set_diskette_ret_status(0x06); SET_CF(); return; case 0x17: // set diskette type for format(old) BX_DEBUG_INT13_FL("floppy f17\n"); // NOTE: 1.44M diskette not supported by this function, // should use Int13 al=0x18 instead. // Intr Reference: http://www.ctyme.com/intr // // ** media state byte ** // Bitfields for diskette drive media state byte that we might // change in this function: // Bit(s) Description (Table M0030) // 7-6 data rate // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps // 5 double stepping required (e.g. 360kB in 1.2MB) // 4 media type established // Drive number (0 or 1) values allowed drive = GET_ELDL(); // Drive type (AL) // 00 - NOT USED // 01 - DISKETTE 320/360K IN 360K DRIVE // 02 - DISKETTE 360K IN 1.2M DRIVE // 03 - DISKETTE 1.2M IN 1.2M DRIVE // 04 - DISKETTE 720K IN 720K DRIVE drive_type = GET_AL(); if (drive > 1) { SET_AH(0x01); // invalid drive set_diskette_ret_status(1); // bad parameter SET_CF(); return; } // see if drive exists if (floppy_drive_exists(drive) == 0) { SET_AH(0x80); // not responding/time out set_diskette_ret_status(0x80); SET_CF(); return; } // Get current drive status into 'status'. Set 'base_address' to media status offset address base_address = (drive) ? 0x0091 : 0x0090; status = read_byte(0x0040, base_address); // Mask out (clear) bits 4-7 (4:media type established, 5:double stepping, 6-7:data rate), val8 = status & 0x0f; switch(drive_type) { case 1: // 320/360K media in 360K drive val8 |= 0x90; // 1001 0000 (media type established, data rate=250) break; case 2: // 360K media in 1.2M drive val8 |= 0x70; // 0111 0000 (media type established, double stepping, data rate=300) break; case 3: // 1.2M media in 1.2M drive val8 |= 0x10; // 0001 0000 (media type established, data rate=500) break; case 4: // 720K media in 720K drive if (((status >> 4) & 0x01) && ((status >> 1) & 0x01)) { // Media type already determined, and multiple format capable, so assume a higher data rate. val8 |= 0x50; // 0101 0000 (media type established, data rate=300) } else { // Media type not yet determined, or not multiple format capable, assume a lower data rate. val8 |= 0x90; // 1001 0000 (media type established, data rate=250) } break; default: // bad parameter SET_AH(0x01); // invalid drive set_diskette_ret_status(1); // bad parameter SET_CF(); return; } BX_DEBUG_INT13_FL("floppy f17 - media status set to: %02x\n", val8); // Update media status write_byte(0x0040, base_address, val8); // return success! SET_AH(0); set_diskette_ret_status(0); CLEAR_CF(); return; case 0x18: // set diskette type for format(new) BX_DEBUG_INT13_FL("floppy f18\n"); // Set Media Type for Format verifies that the device supports a specific geometry. // Unlike Int13 al=0x17 entry point, this version supports higher capacity // drives like 1.44M and even 2.88M. // Drive number (0 or 1) values allowed drive = GET_ELDL(); val8 = GET_CL(); spt = val8 & 0x3f; // sectors per track maxCyl = ((val8 >> 6) << 8) + GET_CH(); // max cylinder number (max cylinders - 1) BX_DEBUG_INT13_FL("floppy f18 - drive: %d, max cylinder number: %d, sectors-per-tracks: %d\n", drive, maxCyl, spt); if (drive > 1) { SET_AH(0x01); // invalid drive set_diskette_ret_status(1); // bad parameter SET_CF(); return; } // see if drive exists if (floppy_drive_exists(drive) == 0) { SET_AH(0x80); // not responding/time out set_diskette_ret_status(0x80); SET_CF(); return; } // see if media in drive, and type is known if (floppy_media_known(drive) == 0) { if (floppy_media_sense(drive) == 0) { SET_AH(0x0C); // drive type unknown set_diskette_ret_status(0x0C); SET_CF(); return; } } // get current drive type drive_type = inb_cmos(0x10); if (drive == 0) drive_type >>= 4; else drive_type &= 0x0f; // Get current drive status into 'status'. Set 'base_address' to media status offset address base_address = (drive) ? 0x0091 : 0x0090; status = read_byte(0x0040, base_address); // Mask out (clear) bits 4-7 (4:media type established, 5:double stepping, 6-7:data rate), val8 = status & 0x0f; SET_AH(0x0C); // Assume error - unsupported combination of drive-type/max-cylinders/sectors-per-track switch (drive_type) { case 0: // none break; case 1: // 360KB, 5.25" case 6: // 160k, 5.25" case 7: // 180k, 5.25" case 8: // 320k, 5.25" if (maxCyl == 39 && (spt == 8 || spt == 9)) { val8 |= 0x90; // 1001 0000 (media type established, data rate=250) SET_AH(0); } break; case 2: // 1.2MB, 5.25" if (maxCyl == 39 && (spt == 8 || spt == 9)) { // 320K/360K disk in 1.2M drive val8 |= 0x70; // 0111 0000 (media type established, double stepping, data rate=300) SET_AH(0); } else if (maxCyl == 79 && spt == 15) { // 1.2M disk in 1.2M drive val8 |= 0x10; // 0001 0000 (media type established, data rate=500) SET_AH(0); } break; case 3: // 720KB, 3.5" if (maxCyl == 79 && spt == 9) { val8 |= 0x90; // 1001 0000 (media type established, data rate=250) SET_AH(0); } break; case 4: // 1.44MB, 3.5" if (maxCyl == 79) { if (spt == 9) { // 720K disk in 1.44M drive val8 |= 0x90; // 1001 0000 (media type established, data rate=250) SET_AH(0); } else if (spt == 18) { // 1.44M disk in 1.44M drive val8 |= 0x10; // 0001 0000 (media type established, data rate=500) SET_AH(0); } } break; case 5: // 2.88MB, 3.5" if (maxCyl == 79) { if (spt == 9) { // 720K disk in 2.88M drive val8 |= 0x90; // 1001 0000 (media type established, data rate=250) SET_AH(0); } else if (spt == 18) { // 1.44M disk in 2.88M drive val8 |= 0x10; // 0001 0000 (media type established, data rate=500) SET_AH(0); } else if (spt == 36) { // 2.88M disk in 2.88M drive val8 |= 0xD0; // 1101 0000 (media type established, data rate=1mb/s) SET_AH(0); } } break; default: break; } if (0 != GET_AH()) { // Error - assume requested max-cylinder/sectors-per-track not supported // for current drive type - or drive type is unknown! set_diskette_ret_status(GET_AH()); SET_CF(); return; } BX_DEBUG_INT13_FL("floppy f18 - media status set to: %02x\n", val8); // Update media status write_byte(0x0040, base_address, val8); // set es & di to point to 11 byte diskette param table in ROM // Note that we do not update the table, as I don't see it being used anywhere... ASM_START push bp mov bp, sp mov ax, #diskette_param_table2 mov _int13_diskette_function.DI+2[bp], ax mov _int13_diskette_function.ES+2[bp], cs pop bp ASM_END // return success! set_diskette_ret_status(0); CLEAR_CF(); return; default: BX_INFO("int13_diskette: unsupported AH=%02x\n", GET_AH()); // if ((ah==0x20) || ((ah>=0x41) && (ah<=0x49)) || (ah==0x4e)) { SET_AH(0x01); // ??? set_diskette_ret_status(1); SET_CF(); return; // } } } #else // #if BX_SUPPORT_FLOPPY void int13_diskette_function(DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS) Bit16u DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS; { Bit8u val8; switch (GET_AH()) { case 0x01: // Read Diskette Status CLEAR_CF(); val8 = read_byte(0x0000, 0x0441); SET_AH(val8); if (val8) { SET_CF(); } return; default: SET_CF(); write_byte(0x0000, 0x0441, 0x01); SET_AH(0x01); } } #endif // #if BX_SUPPORT_FLOPPY void set_diskette_ret_status(value) Bit8u value; { write_byte(0x0040, 0x0041, value); } void set_diskette_current_cyl(drive, cyl) Bit8u drive; Bit8u cyl; { if (drive > 1) BX_PANIC("set_diskette_current_cyl(): drive > 1\n"); write_byte(0x0040, 0x0094+drive, cyl); } void determine_floppy_media(drive) Bit16u drive; { #if 0 Bit8u val8, DOR, ctrl_info; ctrl_info = read_byte(0x0040, 0x008F); if (drive==1) ctrl_info >>= 4; else ctrl_info &= 0x0f; #if 0 if (drive == 0) { DOR = 0x1c; // DOR: drive0 motor on, DMA&int enabled, normal op, drive select 0 } else { DOR = 0x2d; // DOR: drive1 motor on, DMA&int enabled, normal op, drive select 1 } #endif if ((ctrl_info & 0x04) != 0x04) { // Drive not determined means no drive exists, done. return; } #if 0 // check Main Status Register for readiness val8 = inb(PORT_FD_STATUS) & 0x80; // Main Status Register if (val8 != 0x80) BX_PANIC("d_f_m: MRQ bit not set\n"); // change line // existing BDA values // turn on drive motor outb(PORT_FD_DOR, DOR); // Digital Output Register // #endif BX_PANIC("d_f_m: OK so far\n"); #endif } void int17_function(regs, ds, iret_addr) pusha_regs_t regs; // regs pushed from PUSHA instruction Bit16u ds; // previous DS:, DS set to 0x0000 by asm wrapper iret_addr_t iret_addr; // CS,IP,Flags pushed from original INT call { Bit16u addr,timeout; Bit8u val8; ASM_START sti ASM_END addr = read_word(0x0040, (regs.u.r16.dx << 1) + 8); if ((regs.u.r8.ah < 3) && (regs.u.r16.dx < 3) && (addr > 0)) { timeout = read_byte(0x0040, 0x0078 + regs.u.r16.dx) << 8; if (regs.u.r8.ah == 0) { outb(addr, regs.u.r8.al); val8 = inb(addr+2); outb(addr+2, val8 | 0x01); // send strobe ASM_START nop ASM_END outb(addr+2, val8 & ~0x01); while (((inb(addr+1) & 0x40) == 0x40) && (timeout)) { timeout--; } } if (regs.u.r8.ah == 1) { val8 = inb(addr+2); outb(addr+2, val8 & ~0x04); // send init ASM_START nop ASM_END outb(addr+2, val8 | 0x04); } val8 = inb(addr+1); regs.u.r8.ah = (val8 ^ 0x48); if (!timeout) regs.u.r8.ah |= 0x01; ClearCF(iret_addr.flags); } else { SetCF(iret_addr.flags); // Unsupported } } void int19_function(seq_nr) Bit16u seq_nr; { Bit16u ebda_seg=read_word(0x0040,0x000E); Bit16u bootdev; Bit8u bootdrv; Bit8u bootchk; Bit16u bootseg; Bit16u bootip; Bit16u status; Bit16u bootfirst; ipl_entry_t e; // if BX_ELTORITO_BOOT is not defined, old behavior // check bit 5 in CMOS reg 0x2d. load either 0x00 or 0x80 into DL // in preparation for the initial INT 13h (0=floppy A:, 0x80=C:) // 0: system boot sequence, first drive C: then A: // 1: system boot sequence, first drive A: then C: // else BX_ELTORITO_BOOT is defined // CMOS regs 0x3D and 0x38 contain the boot sequence: // CMOS reg 0x3D & 0x0f : 1st boot device // CMOS reg 0x3D & 0xf0 : 2nd boot device // CMOS reg 0x38 & 0xf0 : 3rd boot device // boot device codes: // 0x00 : not defined // 0x01 : first floppy // 0x02 : first harddrive // 0x03 : first cdrom // 0x04 - 0x0f : PnP expansion ROMs (e.g. Etherboot) // else : boot failure // Get the boot sequence #if BX_ELTORITO_BOOT bootdev = inb_cmos(0x3d); bootdev |= ((inb_cmos(0x38) & 0xf0) << 4); bootdev >>= 4 * seq_nr; bootdev &= 0xf; /* Read user selected device */ bootfirst = read_word(IPL_SEG, IPL_BOOTFIRST_OFFSET); if (bootfirst != 0xFFFF) { bootdev = bootfirst; /* User selected device not set */ write_word(IPL_SEG, IPL_BOOTFIRST_OFFSET, 0xFFFF); /* Reset boot sequence */ write_word(IPL_SEG, IPL_SEQUENCE_OFFSET, 0xFFFF); } else if (bootdev == 0) BX_PANIC("No bootable device.\n"); /* Translate from CMOS runes to an IPL table offset by subtracting 1 */ bootdev -= 1; #else if (seq_nr ==2) BX_PANIC("No more boot devices."); if (!!(inb_cmos(0x2d) & 0x20) ^ (seq_nr == 1)) /* Boot from floppy if the bit is set or it's the second boot */ bootdev = 0x00; else bootdev = 0x01; #endif /* Read the boot device from the IPL table */ if (get_boot_vector(bootdev, &e) == 0) { BX_INFO("Invalid boot device (0x%x)\n", bootdev); return; } /* Do the loading, and set up vector as a far pointer to the boot * address, and bootdrv as the boot drive */ print_boot_device(&e); switch(e.type) { case IPL_TYPE_FLOPPY: /* FDD */ case IPL_TYPE_HARDDISK: /* HDD */ bootdrv = (e.type == IPL_TYPE_HARDDISK) ? 0x80 : 0x00; bootseg = 0x07c0; status = 0; ASM_START push bp mov bp, sp push ax push bx push cx push dx mov dl, _int19_function.bootdrv + 2[bp] mov ax, _int19_function.bootseg + 2[bp] mov es, ax ;; segment xor bx, bx ;; offset mov ah, #0x02 ;; function 2, read diskette sector mov al, #0x01 ;; read 1 sector mov ch, #0x00 ;; track 0 mov cl, #0x01 ;; sector 1 mov dh, #0x00 ;; head 0 int #0x13 ;; read sector jnc int19_load_done mov ax, #0x0001 mov _int19_function.status + 2[bp], ax int19_load_done: pop dx pop cx pop bx pop ax pop bp ASM_END if (status != 0) { print_boot_failure(e.type, 1); return; } /* Always check the signature on a HDD boot sector; on FDD, only do * the check if the CMOS doesn't tell us to skip it */ if ((e.type != IPL_TYPE_FLOPPY) || !((inb_cmos(0x38) & 0x01))) { if (read_word(bootseg,0x1fe) != 0xaa55) { print_boot_failure(e.type, 0); return; } } /* Canonicalize bootseg:bootip */ bootip = (bootseg & 0x0fff) << 4; bootseg &= 0xf000; break; #if BX_ELTORITO_BOOT case IPL_TYPE_CDROM: /* CD-ROM */ status = cdrom_boot(); // If failure if ( (status & 0x00ff) !=0 ) { print_cdromboot_failure(status); print_boot_failure(e.type, 1); return; } bootdrv = (Bit8u)(status>>8); bootseg = read_word(ebda_seg,&EbdaData->cdemu.load_segment); bootip = 0; break; #endif case IPL_TYPE_BEV: /* Expansion ROM with a Bootstrap Entry Vector (a far pointer) */ bootseg = e.vector >> 16; bootip = e.vector & 0xffff; break; default: return; } /* Debugging info */ BX_INFO("Booting from %x:%x\n", bootseg, bootip); /* Jump to the boot vector */ ASM_START mov bp, sp push cs push #int18_handler ;; Build an iret stack frame that will take us to the boot vector. ;; iret pops ip, then cs, then flags, so push them in the opposite order. pushf mov ax, _int19_function.bootseg + 0[bp] push ax mov ax, _int19_function.bootip + 0[bp] push ax ;; Set the magic number in ax and the boot drive in dl. mov ax, #0xaa55 mov dl, _int19_function.bootdrv + 0[bp] ;; Zero some of the other registers. xor bx, bx mov ds, bx mov es, bx mov bp, bx ;; Go! iret ASM_END } void int1a_function(regs, ds, iret_addr) pusha_regs_t regs; // regs pushed from PUSHA instruction Bit16u ds; // previous DS:, DS set to 0x0000 by asm wrapper iret_addr_t iret_addr; // CS,IP,Flags pushed from original INT call { Bit8u val8; BX_DEBUG_INT1A("int1a: AX=%04x BX=%04x CX=%04x DX=%04x DS=%04x\n", regs.u.r16.ax, regs.u.r16.bx, regs.u.r16.cx, regs.u.r16.dx, ds); ASM_START sti ASM_END switch (regs.u.r8.ah) { case 0: // get current clock count ASM_START cli ASM_END regs.u.r16.cx = BiosData->ticks_high; regs.u.r16.dx = BiosData->ticks_low; regs.u.r8.al = BiosData->midnight_flag; BiosData->midnight_flag = 0; // reset flag ASM_START sti ASM_END // AH already 0 ClearCF(iret_addr.flags); // OK break; case 1: // Set Current Clock Count ASM_START cli ASM_END BiosData->ticks_high = regs.u.r16.cx; BiosData->ticks_low = regs.u.r16.dx; BiosData->midnight_flag = 0; // reset flag ASM_START sti ASM_END regs.u.r8.ah = 0; ClearCF(iret_addr.flags); // OK break; case 2: // Read CMOS Time if (rtc_updating()) { SetCF(iret_addr.flags); break; } regs.u.r8.dh = inb_cmos(0x00); // Seconds regs.u.r8.cl = inb_cmos(0x02); // Minutes regs.u.r8.ch = inb_cmos(0x04); // Hours regs.u.r8.dl = inb_cmos(0x0b) & 0x01; // Stat Reg B regs.u.r8.ah = 0; regs.u.r8.al = regs.u.r8.ch; ClearCF(iret_addr.flags); // OK break; case 3: // Set CMOS Time // Using a debugger, I notice the following masking/setting // of bits in Status Register B, by setting Reg B to // a few values and getting its value after INT 1A was called. // // try#1 try#2 try#3 // before 1111 1101 0111 1101 0000 0000 // after 0110 0010 0110 0010 0000 0010 // // Bit4 in try#1 flipped in hardware (forced low) due to bit7=1 // My assumption: RegB = ((RegB & 01100000b) | 00000010b) if (rtc_updating()) { init_rtc(); // fall through as if an update were not in progress } outb_cmos(0x00, regs.u.r8.dh); // Seconds outb_cmos(0x02, regs.u.r8.cl); // Minutes outb_cmos(0x04, regs.u.r8.ch); // Hours // Set Daylight Savings time enabled bit to requested value val8 = (inb_cmos(0x0b) & 0x60) | 0x02 | (regs.u.r8.dl & 0x01); // (reg B already selected) outb_cmos(0x0b, val8); regs.u.r8.ah = 0; regs.u.r8.al = val8; // val last written to Reg B ClearCF(iret_addr.flags); // OK break; case 4: // Read CMOS Date regs.u.r8.ah = 0; if (rtc_updating()) { SetCF(iret_addr.flags); break; } regs.u.r8.cl = inb_cmos(0x09); // Year regs.u.r8.dh = inb_cmos(0x08); // Month regs.u.r8.dl = inb_cmos(0x07); // Day of Month regs.u.r8.ch = inb_cmos(0x32); // Century regs.u.r8.al = regs.u.r8.ch; ClearCF(iret_addr.flags); // OK break; case 5: // Set CMOS Date // Using a debugger, I notice the following masking/setting // of bits in Status Register B, by setting Reg B to // a few values and getting its value after INT 1A was called. // // try#1 try#2 try#3 try#4 // before 1111 1101 0111 1101 0000 0010 0000 0000 // after 0110 1101 0111 1101 0000 0010 0000 0000 // // Bit4 in try#1 flipped in hardware (forced low) due to bit7=1 // My assumption: RegB = (RegB & 01111111b) if (rtc_updating()) { init_rtc(); SetCF(iret_addr.flags); break; } outb_cmos(0x09, regs.u.r8.cl); // Year outb_cmos(0x08, regs.u.r8.dh); // Month outb_cmos(0x07, regs.u.r8.dl); // Day of Month outb_cmos(0x32, regs.u.r8.ch); // Century val8 = inb_cmos(0x0b) & 0x7f; // clear halt-clock bit outb_cmos(0x0b, val8); regs.u.r8.ah = 0; regs.u.r8.al = val8; // AL = val last written to Reg B ClearCF(iret_addr.flags); // OK break; case 6: // Set Alarm Time in CMOS // Using a debugger, I notice the following masking/setting // of bits in Status Register B, by setting Reg B to // a few values and getting its value after INT 1A was called. // // try#1 try#2 try#3 // before 1101 1111 0101 1111 0000 0000 // after 0110 1111 0111 1111 0010 0000 // // Bit4 in try#1 flipped in hardware (forced low) due to bit7=1 // My assumption: RegB = ((RegB & 01111111b) | 00100000b) val8 = inb_cmos(0x0b); // Get Status Reg B regs.u.r16.ax = 0; if (val8 & 0x20) { // Alarm interrupt enabled already SetCF(iret_addr.flags); // Error: alarm in use break; } if (rtc_updating()) { init_rtc(); // fall through as if an update were not in progress } outb_cmos(0x01, regs.u.r8.dh); // Seconds alarm outb_cmos(0x03, regs.u.r8.cl); // Minutes alarm outb_cmos(0x05, regs.u.r8.ch); // Hours alarm outb(PORT_PIC2_DATA, inb(PORT_PIC2_DATA) & 0xfe); // enable IRQ 8 // enable Status Reg B alarm bit, clear halt clock bit outb_cmos(0x0b, (val8 & 0x7f) | 0x20); ClearCF(iret_addr.flags); // OK break; case 7: // Turn off Alarm // Using a debugger, I notice the following masking/setting // of bits in Status Register B, by setting Reg B to // a few values and getting its value after INT 1A was called. // // try#1 try#2 try#3 try#4 // before 1111 1101 0111 1101 0010 0000 0010 0010 // after 0100 0101 0101 0101 0000 0000 0000 0010 // // Bit4 in try#1 flipped in hardware (forced low) due to bit7=1 // My assumption: RegB = (RegB & 01010111b) val8 = inb_cmos(0x0b); // Get Status Reg B // clear clock-halt bit, disable alarm bit outb_cmos(0x0b, val8 & 0x57); // disable alarm bit regs.u.r8.ah = 0; regs.u.r8.al = val8; // val last written to Reg B ClearCF(iret_addr.flags); // OK break; #if BX_PCIBIOS case 0xb1: // real mode PCI BIOS functions now handled in assembler code // this C code handles the error code for information only if (regs.u.r8.bl == 0xff) { BX_INFO("PCI BIOS: PCI not present\n"); } else if (regs.u.r8.bl == 0x81) { BX_INFO("unsupported PCI BIOS function 0x%02x\n", regs.u.r8.al); } else if (regs.u.r8.bl == 0x83) { BX_INFO("bad PCI vendor ID %04x\n", regs.u.r16.dx); } else if (regs.u.r8.bl == 0x86) { if (regs.u.r8.al == 0x02) { BX_INFO("PCI device %04x:%04x not found at index %d\n", regs.u.r16.dx, regs.u.r16.cx, regs.u.r16.si); } else { BX_INFO("no PCI device with class code 0x%02x%04x found at index %d\n", regs.u.r8.cl, regs.u.r16.dx, regs.u.r16.si); } } regs.u.r8.ah = regs.u.r8.bl; SetCF(iret_addr.flags); break; #endif default: SetCF(iret_addr.flags); // Unsupported } } void int70_function(regs, ds, iret_addr) pusha_regs_t regs; // regs pushed from PUSHA instruction Bit16u ds; // previous DS:, DS set to 0x0000 by asm wrapper iret_addr_t iret_addr; // CS,IP,Flags pushed from original INT call { // INT 70h: IRQ 8 - CMOS RTC interrupt from periodic or alarm modes Bit8u registerB = 0, registerC = 0; // Check which modes are enabled and have occurred. registerB = inb_cmos( 0xB ); registerC = inb_cmos( 0xC ); if( ( registerB & 0x60 ) != 0 ) { if( ( registerC & 0x20 ) != 0 ) { // Handle Alarm Interrupt. ASM_START sti int #0x4a cli ASM_END } if( ( registerC & 0x40 ) != 0 ) { // Handle Periodic Interrupt. if( read_byte( 0x40, 0xA0 ) != 0 ) { // Wait Interval (Int 15, AH=83) active. Bit32u time, toggle; time = read_dword( 0x40, 0x9C ); // Time left in microseconds. if( time < 0x3D1 ) { // Done waiting. Bit16u segment, offset; segment = read_word( 0x40, 0x98 ); offset = read_word( 0x40, 0x9A ); write_byte( 0x40, 0xA0, 0 ); // Turn of status byte. outb_cmos( 0xB, registerB & 0x37 ); // Clear the Periodic Interrupt. write_byte(segment, offset, read_byte(segment, offset) | 0x80 ); // Write to specified flag byte. } else { // Continue waiting. time -= 0x3D1; write_dword( 0x40, 0x9C, time ); } } } } ASM_START call eoi_both_pics ASM_END } ASM_START ;------------------------------------------ ;- INT74h : PS/2 mouse hardware interrupt - ;------------------------------------------ int74_handler: sti pusha push ds ;; save DS push #0x00 ;; placeholder for status push #0x00 ;; placeholder for X push #0x00 ;; placeholder for Y push #0x00 ;; placeholder for Z push #0x00 ;; placeholder for make_far_call boolean call _int74_function pop cx ;; remove make_far_call from stack jcxz int74_done ;; make far call to EBDA:0022 push #0x00 pop ds push 0x040E ;; push 0000:040E (opcodes 0xff, 0x36, 0x0E, 0x04) pop ds //CALL_EP(0x0022) ;; call far routine (call_Ep DS:0022 :opcodes 0xff, 0x1e, 0x22, 0x00) call far ptr[0x22] int74_done: cli call eoi_both_pics add sp, #8 ;; pop status, x, y, z pop ds ;; restore DS popa iret ;; This will perform an IRET, but will retain value of current CF ;; by altering flags on stack. Better than RETF #02. iret_modify_cf: jc carry_set push bp mov bp, sp and BYTE [bp + 0x06], #0xfe pop bp iret carry_set: push bp mov bp, sp or BYTE [bp + 0x06], #0x01 pop bp iret ;---------------------- ;- INT13h (relocated) - ;---------------------- ; ; int13_relocated is a little bit messed up since I played with it ; I have to rewrite it: ; - call a function that detect which function to call ; - make all called C function get the same parameters list ; int13_relocated: #if BX_ELTORITO_BOOT ;; check for an eltorito function cmp ah,#0x4a jb int13_not_eltorito cmp ah,#0x4d ja int13_not_eltorito pusha push es push ds push ss pop ds push #int13_out jmp _int13_eltorito ;; ELDX not used int13_not_eltorito: push ax push bx push cx push dx ;; check if emulation active call _cdemu_isactive cmp al,#0x00 je int13_cdemu_inactive ;; check if access to the emulated drive call _cdemu_emulated_drive pop dx push dx cmp al,dl ;; int13 on emulated drive jne int13_nocdemu pop dx pop cx pop bx pop ax pusha push es push ds push ss pop ds push #int13_out jmp _int13_cdemu ;; ELDX not used int13_nocdemu: and dl,#0xE0 ;; mask to get device class, including cdroms cmp al,dl ;; al is 0x00 or 0x80 jne int13_cdemu_inactive ;; inactive for device class pop dx pop cx pop bx pop ax push ax push cx push dx push bx dec dl ;; real drive is dl - 1 jmp int13_legacy int13_cdemu_inactive: pop dx pop cx pop bx pop ax #endif // BX_ELTORITO_BOOT int13_noeltorito: push ax push cx push dx push bx int13_legacy: push dx ;; push eltorito value of dx instead of sp push bp push si push di push es push ds push ss pop ds ;; now the 16-bit registers can be restored with: ;; pop ds; pop es; popa; iret ;; arguments passed to functions should be ;; DS, ES, DI, SI, BP, ELDX, BX, DX, CX, AX, IP, CS, FLAGS test dl, #0x80 jnz int13_notfloppy push #int13_out jmp _int13_diskette_function int13_notfloppy: #if BX_USE_ATADRV cmp dl, #0xE0 jb int13_notcdrom // ebx is modified: BSD 5.2.1 boot loader problem // someone should figure out which 32 bit register that actually are used shr ebx, #16 push bx call _int13_cdrom pop bx shl ebx, #16 jmp int13_out int13_notcdrom: #endif int13_disk: ;; int13_harddisk modifies high word of EAX shr eax, #16 push ax call _int13_harddisk pop ax shl eax, #16 int13_out: pop ds pop es popa iret ;---------- ;- INT18h - ;---------- int18_handler: ;; Boot Failure recovery: try the next device. ;; Reset SP and SS mov ax, #0xfffe mov sp, ax xor ax, ax mov ss, ax ;; Get the boot sequence number out of the IPL memory mov bx, #IPL_SEG mov ds, bx ;; Set segment mov bx, IPL_SEQUENCE_OFFSET ;; BX is now the sequence number inc bx ;; ++ mov IPL_SEQUENCE_OFFSET, bx ;; Write it back mov ds, ax ;; and reset the segment to zero. ;; Carry on in the INT 19h handler, using the new sequence number push bx jmp int19_next_boot ;---------- ;- INT19h - ;---------- int19_relocated: ;; Boot function, relocated ;; int19 was beginning to be really complex, so now it ;; just calls a C function that does the work push bp mov bp, sp ;; Reset SS and SP mov ax, #0xfffe mov sp, ax xor ax, ax mov ss, ax ;; Start from the first boot device (0, in AX) mov bx, #IPL_SEG mov ds, bx ;; Set segment to write to the IPL memory mov IPL_SEQUENCE_OFFSET, ax ;; Save the sequence number mov ds, ax ;; and reset the segment. push ax int19_next_boot: ;; Call the C code for the next boot device call _int19_function ;; Boot failed: invoke the boot recovery function int #0x18 ;---------- ;- INT1Ch - ;---------- int1c_handler: ;; User Timer Tick iret ;---------------------- ;- POST: Floppy Drive - ;---------------------- floppy_drive_post: xor ax, ax mov ds, ax mov al, #0x00 mov 0x043e, al ;; drive 0 & 1 uncalibrated, no interrupt has occurred mov 0x043f, al ;; diskette motor status: read op, drive0, motors off mov 0x0440, al ;; diskette motor timeout counter: not active mov 0x0441, al ;; diskette controller status return code mov 0x0442, al ;; disk & diskette controller status register 0 mov 0x0443, al ;; diskette controller status register 1 mov 0x0444, al ;; diskette controller status register 2 mov 0x0445, al ;; diskette controller cylinder number mov 0x0446, al ;; diskette controller head number mov 0x0447, al ;; diskette controller sector number mov 0x0448, al ;; diskette controller bytes written mov 0x048b, al ;; diskette configuration data ;; ----------------------------------------------------------------- ;; (048F) diskette controller information ;; mov al, #0x10 ;; get CMOS diskette drive type out PORT_CMOS_INDEX, AL in AL, PORT_CMOS_DATA mov ah, al ;; save byte to AH look_drive0: shr al, #4 ;; look at top 4 bits for drive 0 jz f0_missing ;; jump if no drive0 mov bl, #0x07 ;; drive0 determined, multi-rate, has changed line jmp look_drive1 f0_missing: mov bl, #0x00 ;; no drive0 look_drive1: mov al, ah ;; restore from AH and al, #0x0f ;; look at bottom 4 bits for drive 1 jz f1_missing ;; jump if no drive1 or bl, #0x70 ;; drive1 determined, multi-rate, has changed line f1_missing: ;; leave high bits in BL zerod mov 0x048f, bl ;; put new val in BDA (diskette controller information) ;; ----------------------------------------------------------------- mov al, #0x00 mov 0x0490, al ;; diskette 0 media state mov 0x0491, al ;; diskette 1 media state ;; diskette 0,1 operational starting state ;; drive type has not been determined, ;; has no changed detection line mov 0x0492, al mov 0x0493, al mov 0x0494, al ;; diskette 0 current cylinder mov 0x0495, al ;; diskette 1 current cylinder mov al, #0x02 out PORT_DMA1_MASK_REG, al ;; clear DMA-1 channel 2 mask bit SET_INT_VECTOR(0x1E, #0xF000, #diskette_param_table2) SET_INT_VECTOR(0x40, #0xF000, #int13_diskette) SET_INT_VECTOR(0x0E, #0xF000, #int0e_handler) ;; IRQ 6 ret ;-------------------- ;- POST: HARD DRIVE - ;-------------------- ; relocated here because the primary POST area isnt big enough. hard_drive_post: // IRQ 14 = INT 76h // INT 76h calls INT 15h function ax=9100 mov al, #0x0a ; 0000 1010 = reserved, disable IRQ 14 mov dx, #0x03f6 out dx, al xor ax, ax mov ds, ax mov 0x0474, al /* hard disk status of last operation */ mov 0x0477, al /* hard disk port offset (XT only ???) */ mov 0x048c, al /* hard disk status register */ mov 0x048d, al /* hard disk error register */ mov 0x048e, al /* hard disk task complete flag */ mov al, #0x01 mov 0x0475, al /* hard disk number attached */ mov al, #0xc0 mov 0x0476, al /* hard disk control byte */ SET_INT_VECTOR(0x13, #0xF000, #int13_handler) SET_INT_VECTOR(0x76, #0xF000, #int76_handler) ;; INT 41h: hard disk 0 configuration pointer ;; INT 46h: hard disk 1 configuration pointer SET_INT_VECTOR(0x41, #EBDA_SEG, #0x003D) SET_INT_VECTOR(0x46, #EBDA_SEG, #0x004D) ;; move disk geometry data from CMOS to EBDA disk parameter table(s) mov al, #0x12 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA and al, #0xf0 cmp al, #0xf0 je post_d0_extended jmp check_for_hd1 post_d0_extended: mov al, #0x19 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA cmp al, #47 ;; decimal 47 - user definable je post_d0_type47 HALT(__LINE__) post_d0_type47: ;; CMOS purpose param table offset ;; 1b cylinders low 0 ;; 1c cylinders high 1 ;; 1d heads 2 ;; 1e write pre-comp low 5 ;; 1f write pre-comp high 6 ;; 20 retries/bad map/heads>8 8 ;; 21 landing zone low C ;; 22 landing zone high D ;; 23 sectors/track E mov ax, #EBDA_SEG mov ds, ax ;;; Filling EBDA table for hard disk 0. mov al, #0x1f out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov ah, al mov al, #0x1e out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov (0x003d + 0x05), ax ;; write precomp word mov al, #0x20 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov (0x003d + 0x08), al ;; drive control byte mov al, #0x22 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov ah, al mov al, #0x21 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov (0x003d + 0x0C), ax ;; landing zone word mov al, #0x1c ;; get cylinders word in AX out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA ;; high byte mov ah, al mov al, #0x1b out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA ;; low byte mov bx, ax ;; BX = cylinders mov al, #0x1d out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov cl, al ;; CL = heads mov al, #0x23 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov dl, al ;; DL = sectors cmp bx, #1024 jnbe hd0_post_logical_chs ;; if cylinders > 1024, use translated style CHS hd0_post_physical_chs: ;; no logical CHS mapping used, just physical CHS ;; use Standard Fixed Disk Parameter Table (FDPT) mov (0x003d + 0x00), bx ;; number of physical cylinders mov (0x003d + 0x02), cl ;; number of physical heads mov (0x003d + 0x0E), dl ;; number of physical sectors jmp check_for_hd1 hd0_post_logical_chs: ;; complies with Phoenix style Translated Fixed Disk Parameter Table (FDPT) mov (0x003d + 0x09), bx ;; number of physical cylinders mov (0x003d + 0x0b), cl ;; number of physical heads mov (0x003d + 0x04), dl ;; number of physical sectors mov (0x003d + 0x0e), dl ;; number of logical sectors (same) mov al, #0xa0 mov (0x003d + 0x03), al ;; A0h signature, indicates translated table cmp bx, #2048 jnbe hd0_post_above_2048 ;; 1024 < c <= 2048 cylinders shr bx, #0x01 shl cl, #0x01 jmp hd0_post_store_logical hd0_post_above_2048: cmp bx, #4096 jnbe hd0_post_above_4096 ;; 2048 < c <= 4096 cylinders shr bx, #0x02 shl cl, #0x02 jmp hd0_post_store_logical hd0_post_above_4096: cmp bx, #8192 jnbe hd0_post_above_8192 ;; 4096 < c <= 8192 cylinders shr bx, #0x03 shl cl, #0x03 jmp hd0_post_store_logical hd0_post_above_8192: ;; 8192 < c <= 16384 cylinders shr bx, #0x04 shl cl, #0x04 hd0_post_store_logical: mov (0x003d + 0x00), bx ;; number of physical cylinders mov (0x003d + 0x02), cl ;; number of physical heads ;; checksum mov cl, #0x0f ;; repeat count mov si, #0x003d ;; offset to disk0 FDPT mov al, #0x00 ;; sum hd0_post_checksum_loop: add al, [si] inc si dec cl jnz hd0_post_checksum_loop not al ;; now take 2s complement inc al mov [si], al ;;; Done filling EBDA table for hard disk 0. check_for_hd1: ;; is there really a second hard disk? if not, return now mov al, #0x12 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA and al, #0x0f jnz post_d1_exists ret post_d1_exists: ;; check that the hd type is really 0x0f. cmp al, #0x0f jz post_d1_extended HALT(__LINE__) post_d1_extended: ;; check that the extended type is 47 - user definable mov al, #0x1a out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA cmp al, #47 ;; decimal 47 - user definable je post_d1_type47 HALT(__LINE__) post_d1_type47: ;; Table for disk1. ;; CMOS purpose param table offset ;; 0x24 cylinders low 0 ;; 0x25 cylinders high 1 ;; 0x26 heads 2 ;; 0x27 write pre-comp low 5 ;; 0x28 write pre-comp high 6 ;; 0x29 heads>8 8 ;; 0x2a landing zone low C ;; 0x2b landing zone high D ;; 0x2c sectors/track E ;;; Fill EBDA table for hard disk 1. mov ax, #EBDA_SEG mov ds, ax mov al, #0x28 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov ah, al mov al, #0x27 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov (0x004d + 0x05), ax ;; write precomp word mov al, #0x29 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov (0x004d + 0x08), al ;; drive control byte mov al, #0x2b out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov ah, al mov al, #0x2a out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov (0x004d + 0x0C), ax ;; landing zone word mov al, #0x25 ;; get cylinders word in AX out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA ;; high byte mov ah, al mov al, #0x24 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA ;; low byte mov bx, ax ;; BX = cylinders mov al, #0x26 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov cl, al ;; CL = heads mov al, #0x2c out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov dl, al ;; DL = sectors cmp bx, #1024 jnbe hd1_post_logical_chs ;; if cylinders > 1024, use translated style CHS hd1_post_physical_chs: ;; no logical CHS mapping used, just physical CHS ;; use Standard Fixed Disk Parameter Table (FDPT) mov (0x004d + 0x00), bx ;; number of physical cylinders mov (0x004d + 0x02), cl ;; number of physical heads mov (0x004d + 0x0E), dl ;; number of physical sectors ret hd1_post_logical_chs: ;; complies with Phoenix style Translated Fixed Disk Parameter Table (FDPT) mov (0x004d + 0x09), bx ;; number of physical cylinders mov (0x004d + 0x0b), cl ;; number of physical heads mov (0x004d + 0x04), dl ;; number of physical sectors mov (0x004d + 0x0e), dl ;; number of logical sectors (same) mov al, #0xa0 mov (0x004d + 0x03), al ;; A0h signature, indicates translated table cmp bx, #2048 jnbe hd1_post_above_2048 ;; 1024 < c <= 2048 cylinders shr bx, #0x01 shl cl, #0x01 jmp hd1_post_store_logical hd1_post_above_2048: cmp bx, #4096 jnbe hd1_post_above_4096 ;; 2048 < c <= 4096 cylinders shr bx, #0x02 shl cl, #0x02 jmp hd1_post_store_logical hd1_post_above_4096: cmp bx, #8192 jnbe hd1_post_above_8192 ;; 4096 < c <= 8192 cylinders shr bx, #0x03 shl cl, #0x03 jmp hd1_post_store_logical hd1_post_above_8192: ;; 8192 < c <= 16384 cylinders shr bx, #0x04 shl cl, #0x04 hd1_post_store_logical: mov (0x004d + 0x00), bx ;; number of physical cylinders mov (0x004d + 0x02), cl ;; number of physical heads ;; checksum mov cl, #0x0f ;; repeat count mov si, #0x004d ;; offset to disk0 FDPT mov al, #0x00 ;; sum hd1_post_checksum_loop: add al, [si] inc si dec cl jnz hd1_post_checksum_loop not al ;; now take 2s complement inc al mov [si], al ;;; Done filling EBDA table for hard disk 1. ret ;-------------------- ;- POST: EBDA segment ;-------------------- ; relocated here because the primary POST area isnt big enough. ebda_post: #if BX_USE_EBDA mov ax, #EBDA_SEG mov ds, ax mov byte ptr [0x0], #EBDA_SIZE #endif xor ax, ax ; mov EBDA seg into 40E mov ds, ax mov word ptr [0x40E], #EBDA_SEG ret;; ;-------------------- ;- POST: EOI + jmp via [0x40:67) ;-------------------- ; relocated here because the primary POST area isnt big enough. eoi_jmp_post: mov al, #0x11 ; send initialisation commands out PORT_PIC1_CMD, al out PORT_PIC2_CMD, al mov al, #0x08 out PORT_PIC1_DATA, al mov al, #0x70 out PORT_PIC2_DATA, al mov al, #0x04 out PORT_PIC1_DATA, al mov al, #0x02 out PORT_PIC2_DATA, al mov al, #0x01 out PORT_PIC1_DATA, al out PORT_PIC2_DATA, al mov al, #0xb8 out PORT_PIC1_DATA, AL ;master pic: unmask IRQ 0, 1, 2, 6 #if BX_USE_PS2_MOUSE mov al, #0x8f #else mov al, #0x9f #endif out PORT_PIC2_DATA, AL ;slave pic: unmask IRQ 12, 13, 14 mov al, #0x20 out PORT_PIC2_CMD, al ;; slave PIC EOI mov al, #0x20 out PORT_PIC1_CMD, al ;; master PIC EOI jmp_post_0x467: xor ax, ax mov ds, ax jmp far ptr [0x467] iret_post_0x467: xor ax, ax mov ds, ax mov sp, [0x467] mov ss, [0x469] iret retf_post_0x467: xor ax, ax mov ds, ax mov sp, [0x467] mov ss, [0x469] retf s3_post: mov sp, #0xffe #if BX_ROMBIOS32 call rombios32_init #endif call _s3_resume mov bl, #0x00 and ax, ax jz normal_post call _s3_resume_panic ;-------------------- eoi_both_pics: mov al, #0x20 out PORT_PIC2_CMD, al ;; slave PIC EOI eoi_master_pic: mov al, #0x20 out PORT_PIC1_CMD, al ;; master PIC EOI ret ;-------------------- BcdToBin: ;; in: AL in BCD format ;; out: AL in binary format, AH will always be 0 ;; trashes BX mov bl, al and bl, #0x0f ;; bl has low digit shr al, #4 ;; al has high digit mov bh, #10 mul al, bh ;; multiply high digit by 10 (result in AX) add al, bl ;; then add low digit ret ;-------------------- timer_tick_post: ;; Setup the Timer Ticks Count (0x46C:dword) and ;; Timer Ticks Roller Flag (0x470:byte) ;; The Timer Ticks Count needs to be set according to ;; the current CMOS time, as if ticks have been occurring ;; at 18.2hz since midnight up to this point. Calculating ;; this is a little complicated. Here are the factors I gather ;; regarding this. 14,318,180 hz was the original clock speed, ;; chosen so it could be divided by either 3 to drive the 5Mhz CPU ;; at the time, or 4 to drive the CGA video adapter. The div3 ;; source was divided again by 4 to feed a 1.193Mhz signal to ;; the timer. With a maximum 16bit timer count, this is again ;; divided down by 65536 to 18.2hz. ;; ;; 14,318,180 Hz clock ;; /3 = 4,772,726 Hz fed to original 5Mhz CPU ;; /4 = 1,193,181 Hz fed to timer ;; /65536 (maximum timer count) = 18.20650736 ticks/second ;; 1 second = 18.20650736 ticks ;; 1 minute = 1092.390442 ticks ;; 1 hour = 65543.42651 ticks ;; ;; Given the values in the CMOS clock, one could calculate ;; the number of ticks by the following: ;; ticks = (BcdToBin(seconds) * 18.206507) + ;; (BcdToBin(minutes) * 1092.3904) ;; (BcdToBin(hours) * 65543.427) ;; To get a little more accuracy, since Im using integer ;; arithmetic, I use: ;; ticks = (BcdToBin(seconds) * 18206507) / 1000000 + ;; (BcdToBin(minutes) * 10923904) / 10000 + ;; (BcdToBin(hours) * 65543427) / 1000 ;; assuming DS=0000 ;; get CMOS seconds xor eax, eax ;; clear EAX mov al, #0x00 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA ;; AL has CMOS seconds in BCD call BcdToBin ;; EAX now has seconds in binary mov edx, #18206507 mul eax, edx mov ebx, #1000000 xor edx, edx div eax, ebx mov ecx, eax ;; ECX will accumulate total ticks ;; get CMOS minutes xor eax, eax ;; clear EAX mov al, #0x02 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA ;; AL has CMOS minutes in BCD call BcdToBin ;; EAX now has minutes in binary mov edx, #10923904 mul eax, edx mov ebx, #10000 xor edx, edx div eax, ebx add ecx, eax ;; add to total ticks ;; get CMOS hours xor eax, eax ;; clear EAX mov al, #0x04 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA ;; AL has CMOS hours in BCD call BcdToBin ;; EAX now has hours in binary mov edx, #65543427 mul eax, edx mov ebx, #1000 xor edx, edx div eax, ebx add ecx, eax ;; add to total ticks mov 0x46C, ecx ;; Timer Ticks Count xor al, al mov 0x470, al ;; Timer Ticks Rollover Flag ret ;-------------------- int76_handler: ;; record completion in BIOS task complete flag push ax push ds mov ax, #0x0040 mov ds, ax mov 0x008E, #0xff call eoi_both_pics pop ds pop ax iret ;-------------------- #if BX_APM use32 386 #define APM_PROT32 #include "apmbios.S" use16 386 #define APM_PROT16 #include "apmbios.S" #define APM_REAL #include "apmbios.S" #endif ;-------------------- #if BX_PCIBIOS use32 386 .align 16 bios32_structure: db 0x5f, 0x33, 0x32, 0x5f ;; "_32_" signature dw bios32_entry_point, 0xf ;; 32 bit physical address db 0 ;; revision level ;; length in paragraphs and checksum stored in a word to prevent errors dw (~(((bios32_entry_point >> 8) + (bios32_entry_point & 0xff) + 0x32) \ & 0xff) << 8) + 0x01 db 0,0,0,0,0 ;; reserved .align 16 bios32_entry_point: pushfd cmp eax, #0x49435024 ;; "$PCI" jne unknown_service mov eax, #0x80000000 mov dx, #0x0cf8 out dx, eax mov dx, #0x0cfc in eax, dx #ifdef PCI_FIXED_HOST_BRIDGE cmp eax, #PCI_FIXED_HOST_BRIDGE jne unknown_service #else ;; say ok if a device is present cmp eax, #0xffffffff je unknown_service #endif mov ebx, #0x000f0000 mov ecx, #0x10000 mov edx, #pcibios_protected xor al, al jmp bios32_end unknown_service: mov al, #0x80 bios32_end: #ifdef BX_QEMU and dword ptr[esp+8],0xfffffffc ;; reset CS.RPL for kqemu #endif popfd retf .align 16 pcibios_protected: pushfd cli push esi push edi cmp al, #0x01 ;; installation check jne pci_pro_f02 mov bx, #0x0210 mov cx, #0 mov edx, #0x20494350 ;; "PCI " mov al, #0x01 jmp pci_pro_ok pci_pro_f02: ;; find pci device cmp al, #0x02 jne pci_pro_f03 shl ecx, #16 mov cx, dx xor bx, bx mov di, #0x00 pci_pro_devloop: call pci_pro_select_reg mov dx, #0x0cfc in eax, dx cmp eax, ecx jne pci_pro_nextdev cmp si, #0 je pci_pro_ok dec si pci_pro_nextdev: inc bx cmp bx, #0x0100 jne pci_pro_devloop mov ah, #0x86 jmp pci_pro_fail pci_pro_f03: ;; find class code cmp al, #0x03 jne pci_pro_f08 xor bx, bx mov di, #0x08 pci_pro_devloop2: call pci_pro_select_reg mov dx, #0x0cfc in eax, dx shr eax, #8 cmp eax, ecx jne pci_pro_nextdev2 cmp si, #0 je pci_pro_ok dec si pci_pro_nextdev2: inc bx cmp bx, #0x0100 jne pci_pro_devloop2 mov ah, #0x86 jmp pci_pro_fail pci_pro_f08: ;; read configuration byte cmp al, #0x08 jne pci_pro_f09 call pci_pro_select_reg push edx mov dx, di and dx, #0x03 add dx, #0x0cfc in al, dx pop edx mov cl, al jmp pci_pro_ok pci_pro_f09: ;; read configuration word cmp al, #0x09 jne pci_pro_f0a call pci_pro_select_reg push edx mov dx, di and dx, #0x02 add dx, #0x0cfc in ax, dx pop edx mov cx, ax jmp pci_pro_ok pci_pro_f0a: ;; read configuration dword cmp al, #0x0a jne pci_pro_f0b call pci_pro_select_reg push edx mov dx, #0x0cfc in eax, dx pop edx mov ecx, eax jmp pci_pro_ok pci_pro_f0b: ;; write configuration byte cmp al, #0x0b jne pci_pro_f0c call pci_pro_select_reg push edx mov dx, di and dx, #0x03 add dx, #0x0cfc mov al, cl out dx, al pop edx jmp pci_pro_ok pci_pro_f0c: ;; write configuration word cmp al, #0x0c jne pci_pro_f0d call pci_pro_select_reg push edx mov dx, di and dx, #0x02 add dx, #0x0cfc mov ax, cx out dx, ax pop edx jmp pci_pro_ok pci_pro_f0d: ;; write configuration dword cmp al, #0x0d jne pci_pro_unknown call pci_pro_select_reg push edx mov dx, #0x0cfc mov eax, ecx out dx, eax pop edx jmp pci_pro_ok pci_pro_unknown: mov ah, #0x81 pci_pro_fail: pop edi pop esi #ifdef BX_QEMU and dword ptr[esp+8],0xfffffffc ;; reset CS.RPL for kqemu #endif popfd stc retf pci_pro_ok: xor ah, ah pop edi pop esi #ifdef BX_QEMU and dword ptr[esp+8],0xfffffffc ;; reset CS.RPL for kqemu #endif popfd clc retf pci_pro_select_reg: push edx mov eax, #0x800000 mov ax, bx shl eax, #8 and di, #0xff or ax, di and al, #0xfc mov dx, #0x0cf8 out dx, eax pop edx ret use16 386 pcibios_real: push eax push dx mov eax, #0x80000000 mov dx, #0x0cf8 out dx, eax mov dx, #0x0cfc in eax, dx #ifdef PCI_FIXED_HOST_BRIDGE cmp eax, #PCI_FIXED_HOST_BRIDGE je pci_present #else ;; say ok if a device is present cmp eax, #0xffffffff jne pci_present #endif pop dx pop eax mov ah, #0xff stc ret pci_present: pop dx pop eax cmp al, #0x01 ;; installation check jne pci_real_f02 mov ax, #0x0001 mov bx, #0x0210 mov cx, #0 mov edx, #0x20494350 ;; "PCI " mov edi, #0xf0000 mov di, #pcibios_protected clc ret pci_real_f02: ;; find pci device push esi push edi cmp al, #0x02 jne pci_real_f03 shl ecx, #16 mov cx, dx xor bx, bx mov di, #0x00 pci_real_devloop: call pci_real_select_reg mov dx, #0x0cfc in eax, dx cmp eax, ecx jne pci_real_nextdev cmp si, #0 je pci_real_ok dec si pci_real_nextdev: inc bx cmp bx, #0x0100 jne pci_real_devloop mov dx, cx shr ecx, #16 mov ax, #0x8602 jmp pci_real_fail pci_real_f03: ;; find class code cmp al, #0x03 jne pci_real_f08 xor bx, bx mov di, #0x08 pci_real_devloop2: call pci_real_select_reg mov dx, #0x0cfc in eax, dx shr eax, #8 cmp eax, ecx jne pci_real_nextdev2 cmp si, #0 je pci_real_ok dec si pci_real_nextdev2: inc bx cmp bx, #0x0100 jne pci_real_devloop2 mov dx, cx shr ecx, #16 mov ax, #0x8603 jmp pci_real_fail pci_real_f08: ;; read configuration byte cmp al, #0x08 jne pci_real_f09 call pci_real_select_reg push dx mov dx, di and dx, #0x03 add dx, #0x0cfc in al, dx pop dx mov cl, al jmp pci_real_ok pci_real_f09: ;; read configuration word cmp al, #0x09 jne pci_real_f0a call pci_real_select_reg push dx mov dx, di and dx, #0x02 add dx, #0x0cfc in ax, dx pop dx mov cx, ax jmp pci_real_ok pci_real_f0a: ;; read configuration dword cmp al, #0x0a jne pci_real_f0b call pci_real_select_reg push dx mov dx, #0x0cfc in eax, dx pop dx mov ecx, eax jmp pci_real_ok pci_real_f0b: ;; write configuration byte cmp al, #0x0b jne pci_real_f0c call pci_real_select_reg push dx mov dx, di and dx, #0x03 add dx, #0x0cfc mov al, cl out dx, al pop dx jmp pci_real_ok pci_real_f0c: ;; write configuration word cmp al, #0x0c jne pci_real_f0d call pci_real_select_reg push dx mov dx, di and dx, #0x02 add dx, #0x0cfc mov ax, cx out dx, ax pop dx jmp pci_real_ok pci_real_f0d: ;; write configuration dword cmp al, #0x0d jne pci_real_f0e call pci_real_select_reg push dx mov dx, #0x0cfc mov eax, ecx out dx, eax pop dx jmp pci_real_ok pci_real_f0e: ;; get irq routing options cmp al, #0x0e jne pci_real_unknown SEG ES cmp word ptr [di], #pci_routing_table_structure_end - pci_routing_table_structure_start jb pci_real_too_small SEG ES mov word ptr [di], #pci_routing_table_structure_end - pci_routing_table_structure_start pushf push ds push es push cx push si push di cld mov si, #pci_routing_table_structure_start push cs pop ds SEG ES mov cx, [di+2] SEG ES mov es, [di+4] mov di, cx mov cx, #pci_routing_table_structure_end - pci_routing_table_structure_start rep movsb pop di pop si pop cx pop es pop ds popf mov bx, #(1 << 9) | (1 << 11) ;; irq 9 and 11 are used jmp pci_real_ok pci_real_too_small: SEG ES mov word ptr [di], #pci_routing_table_structure_end - pci_routing_table_structure_start mov ah, #0x89 jmp pci_real_fail pci_real_unknown: mov ah, #0x81 pci_real_fail: pop edi pop esi stc ret pci_real_ok: xor ah, ah pop edi pop esi clc ret pci_real_select_reg: push dx mov eax, #0x800000 mov ax, bx shl eax, #8 and di, #0xff or ax, di and al, #0xfc mov dx, #0x0cf8 out dx, eax pop dx ret .align 16 pci_routing_table_structure: db 0x24, 0x50, 0x49, 0x52 ;; "$PIR" signature db 0, 1 ;; version dw 32 + (6 * 16) ;; table size db 0 ;; PCI interrupt router bus db 0x08 ;; PCI interrupt router DevFunc dw 0x0000 ;; PCI exclusive IRQs dw 0x8086 ;; compatible PCI interrupt router vendor ID dw 0x122e ;; compatible PCI interrupt router device ID dw 0,0 ;; Miniport data db 0,0,0,0,0,0,0,0,0,0,0 ;; reserved db 0x37 ;; checksum pci_routing_table_structure_start: ;; first slot entry PCI-to-ISA (embedded) db 0 ;; pci bus number db 0x08 ;; pci device number (bit 7-3) db 0x60 ;; link value INTA#: pointer into PCI2ISA config space dw 0xdef8 ;; IRQ bitmap INTA# db 0x61 ;; link value INTB# dw 0xdef8 ;; IRQ bitmap INTB# db 0x62 ;; link value INTC# dw 0xdef8 ;; IRQ bitmap INTC# db 0x63 ;; link value INTD# dw 0xdef8 ;; IRQ bitmap INTD# db 0 ;; physical slot (0 = embedded) db 0 ;; reserved ;; second slot entry: 1st PCI slot db 0 ;; pci bus number db 0x10 ;; pci device number (bit 7-3) db 0x61 ;; link value INTA# dw 0xdef8 ;; IRQ bitmap INTA# db 0x62 ;; link value INTB# dw 0xdef8 ;; IRQ bitmap INTB# db 0x63 ;; link value INTC# dw 0xdef8 ;; IRQ bitmap INTC# db 0x60 ;; link value INTD# dw 0xdef8 ;; IRQ bitmap INTD# db 1 ;; physical slot (0 = embedded) db 0 ;; reserved ;; third slot entry: 2nd PCI slot db 0 ;; pci bus number db 0x18 ;; pci device number (bit 7-3) db 0x62 ;; link value INTA# dw 0xdef8 ;; IRQ bitmap INTA# db 0x63 ;; link value INTB# dw 0xdef8 ;; IRQ bitmap INTB# db 0x60 ;; link value INTC# dw 0xdef8 ;; IRQ bitmap INTC# db 0x61 ;; link value INTD# dw 0xdef8 ;; IRQ bitmap INTD# db 2 ;; physical slot (0 = embedded) db 0 ;; reserved ;; 4th slot entry: 3rd PCI slot db 0 ;; pci bus number db 0x20 ;; pci device number (bit 7-3) db 0x63 ;; link value INTA# dw 0xdef8 ;; IRQ bitmap INTA# db 0x60 ;; link value INTB# dw 0xdef8 ;; IRQ bitmap INTB# db 0x61 ;; link value INTC# dw 0xdef8 ;; IRQ bitmap INTC# db 0x62 ;; link value INTD# dw 0xdef8 ;; IRQ bitmap INTD# db 3 ;; physical slot (0 = embedded) db 0 ;; reserved ;; 5th slot entry: 4rd PCI slot db 0 ;; pci bus number db 0x28 ;; pci device number (bit 7-3) db 0x60 ;; link value INTA# dw 0xdef8 ;; IRQ bitmap INTA# db 0x61 ;; link value INTB# dw 0xdef8 ;; IRQ bitmap INTB# db 0x62 ;; link value INTC# dw 0xdef8 ;; IRQ bitmap INTC# db 0x63 ;; link value INTD# dw 0xdef8 ;; IRQ bitmap INTD# db 4 ;; physical slot (0 = embedded) db 0 ;; reserved ;; 6th slot entry: 5rd PCI slot db 0 ;; pci bus number db 0x30 ;; pci device number (bit 7-3) db 0x61 ;; link value INTA# dw 0xdef8 ;; IRQ bitmap INTA# db 0x62 ;; link value INTB# dw 0xdef8 ;; IRQ bitmap INTB# db 0x63 ;; link value INTC# dw 0xdef8 ;; IRQ bitmap INTC# db 0x60 ;; link value INTD# dw 0xdef8 ;; IRQ bitmap INTD# db 5 ;; physical slot (0 = embedded) db 0 ;; reserved pci_routing_table_structure_end: #if !BX_ROMBIOS32 pci_irq_list: db 11, 10, 9, 5; pcibios_init_sel_reg: push eax mov eax, #0x800000 mov ax, bx shl eax, #8 and dl, #0xfc or al, dl mov dx, #0x0cf8 out dx, eax pop eax ret pcibios_init_iomem_bases: push bp mov bp, sp mov eax, #0xc0000000 ;; base for memory init push eax mov ax, #0xc000 ;; base for i/o init push ax mov ax, #0x0010 ;; start at base address #0 push ax mov bx, #0x0008 pci_init_io_loop1: mov dl, #0x00 call pcibios_init_sel_reg mov dx, #0x0cfc in ax, dx cmp ax, #0xffff jz next_pci_dev mov dl, #0x04 ;; disable i/o and memory space access call pcibios_init_sel_reg mov dx, #0x0cfc in al, dx and al, #0xfc out dx, al pci_init_io_loop2: mov dl, [bp-8] call pcibios_init_sel_reg mov dx, #0x0cfc in eax, dx test al, #0x01 jnz init_io_base mov ecx, eax mov eax, #0xffffffff out dx, eax in eax, dx cmp eax, ecx je next_pci_base xor eax, #0xffffffff mov ecx, eax mov eax, [bp-4] out dx, eax add eax, ecx ;; calculate next free mem base add eax, #0x01000000 and eax, #0xff000000 mov [bp-4], eax jmp next_pci_base init_io_base: mov cx, ax mov ax, #0xffff out dx, ax in ax, dx cmp ax, cx je next_pci_base xor ax, #0xfffe mov cx, ax mov ax, [bp-6] out dx, ax add ax, cx ;; calculate next free i/o base add ax, #0x0100 and ax, #0xff00 mov [bp-6], ax next_pci_base: mov al, [bp-8] add al, #0x04 cmp al, #0x28 je enable_iomem_space mov byte ptr[bp-8], al jmp pci_init_io_loop2 enable_iomem_space: mov dl, #0x04 ;; enable i/o and memory space access if available call pcibios_init_sel_reg mov dx, #0x0cfc in al, dx or al, #0x07 out dx, al next_pci_dev: mov byte ptr[bp-8], #0x10 inc bx cmp bx, #0x0100 jne pci_init_io_loop1 mov sp, bp pop bp ret pcibios_init_set_elcr: push ax push cx mov dx, #0x04d0 test al, #0x08 jz is_master_pic inc dx and al, #0x07 is_master_pic: mov cl, al mov bl, #0x01 shl bl, cl in al, dx or al, bl out dx, al pop cx pop ax ret pcibios_init_irqs: push ds push bp mov ax, #0xf000 mov ds, ax mov dx, #0x04d0 ;; reset ELCR1 + ELCR2 mov al, #0x00 out dx, al inc dx out dx, al mov si, #pci_routing_table_structure mov bh, [si+8] mov bl, [si+9] mov dl, #0x00 call pcibios_init_sel_reg mov dx, #0x0cfc in ax, dx cmp ax, [si+12] ;; check irq router jne pci_init_end mov dl, [si+34] call pcibios_init_sel_reg push bx ;; save irq router bus + devfunc mov dx, #0x0cfc mov ax, #0x8080 out dx, ax ;; reset PIRQ route control add dx, #2 out dx, ax mov ax, [si+6] sub ax, #0x20 shr ax, #4 mov cx, ax add si, #0x20 ;; set pointer to 1st entry mov bp, sp mov ax, #pci_irq_list push ax xor ax, ax push ax pci_init_irq_loop1: mov bh, [si] mov bl, [si+1] pci_init_irq_loop2: mov dl, #0x00 call pcibios_init_sel_reg mov dx, #0x0cfc in ax, dx cmp ax, #0xffff jnz pci_test_int_pin test bl, #0x07 jz next_pir_entry jmp next_pci_func pci_test_int_pin: mov dl, #0x3c call pcibios_init_sel_reg mov dx, #0x0cfd in al, dx and al, #0x07 jz next_pci_func dec al ;; determine pirq reg mov dl, #0x03 mul al, dl add al, #0x02 xor ah, ah mov bx, ax mov al, [si+bx] mov dl, al mov bx, [bp] call pcibios_init_sel_reg mov dx, #0x0cfc and al, #0x03 add dl, al in al, dx cmp al, #0x80 jb pirq_found mov bx, [bp-2] ;; pci irq list pointer mov al, [bx] out dx, al inc bx mov [bp-2], bx call pcibios_init_set_elcr pirq_found: mov bh, [si] mov bl, [si+1] add bl, [bp-3] ;; pci function number mov dl, #0x3c call pcibios_init_sel_reg mov dx, #0x0cfc out dx, al next_pci_func: inc byte ptr[bp-3] inc bl test bl, #0x07 jnz pci_init_irq_loop2 next_pir_entry: add si, #0x10 mov byte ptr[bp-3], #0x00 loop pci_init_irq_loop1 mov sp, bp pop bx pci_init_end: pop bp pop ds ret #endif // !BX_ROMBIOS32 #endif // BX_PCIBIOS #if BX_ROMBIOS32 rombios32_init: ;; save a20 and enable it in al, PORT_A20 push ax or al, #0x02 out PORT_A20, al ;; save SS:SP to the BDA xor ax, ax mov ds, ax mov 0x0469, ss mov 0x0467, sp SEG CS lidt [pmode_IDT_info] SEG CS lgdt [rombios32_gdt_48] ;; set PE bit in CR0 mov eax, cr0 or al, #0x01 mov cr0, eax ;; start protected mode code: ljmpl 0x10:rombios32_init1 db 0x66, 0xea dw rombios32_05 dw 0x000f ;; high 16 bit address dw 0x0010 use32 386 rombios32_05: ;; init data segments mov eax, #0x18 mov ds, ax mov es, ax mov ss, ax xor eax, eax mov fs, ax mov gs, ax cld ;; init the stack pointer to point below EBDA mov ax, [0x040e] shl eax, #4 mov esp, #-0x10 add esp, eax ;; pass pointer to s3_resume_flag and s3_resume_vector to rombios32 push #0x04b0 push #0x04b2 ;; call rombios32 code mov eax, #0x000e0000 call eax ;; return to 16 bit protected mode first db 0xea dd rombios32_10 dw 0x20 use16 386 rombios32_10: ;; restore data segment limits to 0xffff mov ax, #0x28 mov ds, ax mov es, ax mov ss, ax mov fs, ax mov gs, ax ;; reset PE bit in CR0 mov eax, cr0 and al, #0xFE mov cr0, eax ;; far jump to flush CPU queue after transition to real mode JMP_AP(0xf000, rombios32_real_mode) rombios32_real_mode: ;; restore IDT to normal real-mode defaults SEG CS lidt [rmode_IDT_info] xor ax, ax mov ds, ax mov es, ax mov fs, ax mov gs, ax ;; restore SS:SP from the BDA mov ss, 0x0469 xor esp, esp mov sp, 0x0467 ;; restore a20 pop ax out PORT_A20, al ret rombios32_gdt_48: dw 0x30 dw rombios32_gdt dw 0x000f rombios32_gdt: dw 0, 0, 0, 0 dw 0, 0, 0, 0 dw 0xffff, 0, 0x9b00, 0x00cf ; 32 bit flat code segment (0x10) dw 0xffff, 0, 0x9300, 0x00cf ; 32 bit flat data segment (0x18) dw 0xffff, 0, 0x9b0f, 0x0000 ; 16 bit code segment base=0xf0000 limit=0xffff dw 0xffff, 0, 0x9300, 0x0000 ; 16 bit data segment base=0x0 limit=0xffff #endif // BX_ROMBIOS32 ; parallel port detection: base address in DX, index in BX, timeout in CL detect_parport: push dx add dx, #2 in al, dx and al, #0xdf ; clear input mode out dx, al pop dx mov al, #0xaa out dx, al in al, dx cmp al, #0xaa jne no_parport push bx shl bx, #1 mov [bx+0x408], dx ; Parallel I/O address pop bx mov [bx+0x478], cl ; Parallel printer timeout inc bx no_parport: ret ; serial port detection: base address in DX, index in BX, timeout in CL detect_serial: push dx inc dx mov al, #0x02 out dx, al in al, dx cmp al, #0x02 jne no_serial inc dx in al, dx cmp al, #0x02 jne no_serial dec dx xor al, al out dx, al pop dx push bx shl bx, #1 mov [bx+0x400], dx ; Serial I/O address pop bx mov [bx+0x47c], cl ; Serial timeout inc bx ret no_serial: pop dx ret rom_checksum: pusha push ds xor ax, ax xor bx, bx xor cx, cx xor dx, dx mov ch, [2] shl cx, #1 jnc checksum_loop jz checksum_loop xchg dx, cx dec cx checksum_loop: add al, [bx] inc bx loop checksum_loop test dx, dx je checksum_out add al, [bx] mov cx, dx mov dx, ds add dh, #0x10 mov ds, dx xor dx, dx xor bx, bx jmp checksum_loop checksum_out: and al, #0xff pop ds popa ret .align 16 #if !BX_PNPBIOS ;; Make sure the pnpbios structure is *not* aligned, so OSes will not see it if ;; they scan. db 0 #endif pnpbios_structure: .ascii "$PnP" db 0x10 ;; version db 0x21 ;; length dw 0x0 ;; control field db 0xd1 ;; checksum dd 0xf0000 ;; event notification flag address dw pnpbios_real ;; real mode 16 bit offset dw 0xf000 ;; real mode 16 bit segment dw pnpbios_prot ;; 16 bit protected mode offset dd 0xf0000 ;; 16 bit protected mode segment base dd 0x0 ;; OEM device identifier dw 0xf000 ;; real mode 16 bit data segment dd 0xf0000 ;; 16 bit protected mode segment base pnpbios_prot: push ebp mov ebp, esp jmp pnpbios_code pnpbios_real: push ebp movzx ebp, sp pnpbios_code: mov ax, 8[ebp] cmp ax, #0x60 ;; Get Version and Installation Check jnz pnpbios_fail push ds push di mov ds, 12[bp] mov di, 10[bp] mov ax, #0x0101 mov [di], ax pop di pop ds xor ax, ax ;; SUCCESS jmp pnpbios_exit pnpbios_fail: mov ax, #0x82 ;; FUNCTION_NOT_SUPPORTED pnpbios_exit: pop ebp retf rom_scan: ;; Scan for existence of valid expansion ROMS. ;; Video ROM: from 0xC0000..0xC7FFF in 2k increments ;; General ROM: from 0xC8000..0xDFFFF in 2k increments ;; System ROM: only 0xE0000 ;; ;; Header: ;; Offset Value ;; 0 0x55 ;; 1 0xAA ;; 2 ROM length in 512-byte blocks ;; 3 ROM initialization entry point (FAR CALL) rom_scan_loop: push ax ;; Save AX mov ds, cx mov ax, #0x0004 ;; start with increment of 4 (512-byte) blocks = 2k cmp [0], #0xAA55 ;; look for signature jne rom_scan_increment call rom_checksum jnz rom_scan_increment mov al, [2] ;; change increment to ROM length in 512-byte blocks ;; We want our increment in 512-byte quantities, rounded to ;; the nearest 2k quantity, since we only scan at 2k intervals. test al, #0x03 jz block_count_rounded and al, #0xfc ;; needs rounding up add al, #0x04 block_count_rounded: xor bx, bx ;; Restore DS back to 0000: mov ds, bx push ax ;; Save AX push di ;; Save DI ;; Push addr of ROM entry point push cx ;; Push seg push #0x0003 ;; Push offset ;; Point ES:DI at "$PnP", which tells the ROM that we are a PnP BIOS. ;; That should stop it grabbing INT 19h; we will use its BEV instead. mov ax, #0xf000 mov es, ax lea di, pnpbios_structure mov bp, sp ;; Call ROM init routine using seg:off on stack db 0xff ;; call_far ss:[bp+0] db 0x5e db 0 cli ;; In case expansion ROM BIOS turns IF on add sp, #2 ;; Pop offset value pop cx ;; Pop seg value (restore CX) ;; Look at the ROM's PnP Expansion header. Properly, we're supposed ;; to init all the ROMs and then go back and build an IPL table of ;; all the bootable devices, but we can get away with one pass. mov ds, cx ;; ROM base mov bx, 0x001a ;; 0x1A is the offset into ROM header that contains... mov ax, [bx] ;; the offset of PnP expansion header, where... cmp ax, #0x5024 ;; we look for signature "$PnP" jne no_bev mov ax, 2[bx] cmp ax, #0x506e jne no_bev mov ax, 0x16[bx] ;; 0x16 is the offset of Boot Connection Vector cmp ax, #0x0000 je no_bcv ;; Option ROM has BCV. Run it now. push cx ;; Push seg push ax ;; Push offset ;; Point ES:DI at "$PnP", which tells the ROM that we are a PnP BIOS. mov bx, #0xf000 mov es, bx lea di, pnpbios_structure /* jump to BCV function entry pointer */ mov bp, sp ;; Call ROM BCV routine using seg:off on stack db 0xff ;; call_far ss:[bp+0] db 0x5e db 0 cli ;; In case expansion ROM BIOS turns IF on add sp, #2 ;; Pop offset value pop cx ;; Pop seg value (restore CX) jmp no_bev no_bcv: mov ax, 0x1a[bx] ;; 0x1A is also the offset into the expansion header of... cmp ax, #0x0000 ;; the Bootstrap Entry Vector, or zero if there is none. je no_bev ;; Found a device that thinks it can boot the system. Record its BEV and product name string. mov di, 0x10[bx] ;; Pointer to the product name string or zero if none mov bx, #IPL_SEG ;; Go to the segment where the IPL table lives mov ds, bx mov bx, IPL_COUNT_OFFSET ;; Read the number of entries so far cmp bx, #IPL_TABLE_ENTRIES je no_bev ;; Get out if the table is full shl bx, #0x4 ;; Turn count into offset (entries are 16 bytes) mov 0[bx], #IPL_TYPE_BEV ;; This entry is a BEV device mov 6[bx], cx ;; Build a far pointer from the segment... mov 4[bx], ax ;; and the offset cmp di, #0x0000 je no_prod_str mov 0xA[bx], cx ;; Build a far pointer from the segment... mov 8[bx], di ;; and the offset no_prod_str: shr bx, #0x4 ;; Turn the offset back into a count inc bx ;; We have one more entry now mov IPL_COUNT_OFFSET, bx ;; Remember that. no_bev: pop di ;; Restore DI pop ax ;; Restore AX rom_scan_increment: shl ax, #5 ;; convert 512-bytes blocks to 16-byte increments ;; because the segment selector is shifted left 4 bits. add cx, ax pop ax ;; Restore AX cmp cx, ax jbe rom_scan_loop xor ax, ax ;; Restore DS back to 0000: mov ds, ax ret post_init_pic: mov al, #0x11 ; send initialisation commands out PORT_PIC1_CMD, al out PORT_PIC2_CMD, al mov al, #0x08 out PORT_PIC1_DATA, al mov al, #0x70 out PORT_PIC2_DATA, al mov al, #0x04 out PORT_PIC1_DATA, al mov al, #0x02 out PORT_PIC2_DATA, al mov al, #0x01 out PORT_PIC1_DATA, al out PORT_PIC2_DATA, al mov al, #0xb8 out PORT_PIC1_DATA, AL ;master pic: unmask IRQ 0, 1, 2, 6 #if BX_USE_PS2_MOUSE mov al, #0x8f #else mov al, #0x9f #endif out PORT_PIC2_DATA, AL ;slave pic: unmask IRQ 12, 13, 14 ret post_init_ivt: ;; set all interrupts to default handler xor bx, bx ;; offset index mov cx, #0x0100 ;; counter (256 interrupts) mov ax, #dummy_iret_handler mov dx, #0xF000 post_default_ints: mov [bx], ax add bx, #2 mov [bx], dx add bx, #2 loop post_default_ints ;; Printer Services vector SET_INT_VECTOR(0x17, #0xF000, #int17_handler) ;; Bootstrap failure vector SET_INT_VECTOR(0x18, #0xF000, #int18_handler) ;; Bootstrap Loader vector SET_INT_VECTOR(0x19, #0xF000, #int19_handler) ;; User Timer Tick vector SET_INT_VECTOR(0x1c, #0xF000, #int1c_handler) ;; Memory Size Check vector SET_INT_VECTOR(0x12, #0xF000, #int12_handler) ;; Equipment Configuration Check vector SET_INT_VECTOR(0x11, #0xF000, #int11_handler) ;; System Services SET_INT_VECTOR(0x15, #0xF000, #int15_handler) ;; set vectors 0x60 - 0x67h to zero (0:180..0:19f) xor ax, ax mov cx, #0x0010 ;; 16 words mov di, #0x0180 cld rep stosw ;; set vector 0x79 to zero ;; this is used by 'guardian angel' protection system SET_INT_VECTOR(0x79, #0, #0) ret ;; the following area can be used to write dynamically generated tables .align 16 bios_table_area_start: dd 0xaafb4442 dd bios_table_area_end - bios_table_area_start - 8; ;-------- ;- POST - ;-------- .org 0xe05b ; POST Entry Point post: xor ax, ax ;; first reset the DMA controllers out PORT_DMA1_MASTER_CLEAR,al out PORT_DMA2_MASTER_CLEAR,al ;; then initialize the DMA controllers mov al, #0xC0 out PORT_DMA2_MODE_REG, al ; cascade mode of channel 4 enabled mov al, #0x00 out PORT_DMA2_MASK_REG, al ; unmask channel 4 ;; Examine CMOS shutdown status. mov AL, #0x0f out PORT_CMOS_INDEX, AL in AL, PORT_CMOS_DATA ;; backup status mov bl, al ;; Reset CMOS shutdown status. mov AL, #0x0f out PORT_CMOS_INDEX, AL ; select CMOS register Fh mov AL, #0x00 out PORT_CMOS_DATA, AL ; set shutdown action to normal ;; Examine CMOS shutdown status. mov al, bl ;; 0x00, 0x0D+ = normal startup cmp AL, #0x00 jz normal_post cmp AL, #0x0d jae normal_post ;; 0x05 = eoi + jmp via [0x40:0x67] jump cmp al, #0x05 je eoi_jmp_post ;; 0x0A = jmp via [0x40:0x67] jump cmp al, #0x0a je jmp_post_0x467 ;; 0x0B = iret via [0x40:0x67] cmp al, #0x0b je iret_post_0x467 ;; 0x0C = retf via [0x40:0x67] cmp al, #0x0c je retf_post_0x467 ;; Examine CMOS shutdown status. ;; 0x01,0x02,0x03,0x04,0x06,0x07,0x08,0x09 = Unimplemented shutdown status. push bx call _shutdown_status_panic #if 0 HALT(__LINE__) ; ;#if 0 ; 0xb0, 0x20, /* mov al, #0x20 */ ; 0xe6, 0x20, /* out PORT_PIC1_CMD, al ;send EOI to PIC */ ;#endif ; pop es pop ds popa iret #endif normal_post: ; case 0: normal startup cli mov ax, #0xfffe mov sp, ax xor ax, ax mov ds, ax mov ss, ax ;; Save shutdown status mov 0x04b0, bl cmp bl, #0xfe jz s3_post ;; zero out BIOS data area (40:00..40:ff) mov es, ax mov cx, #0x0080 ;; 128 words mov di, #0x0400 cld rep stosw call _log_bios_start call post_init_ivt ;; base memory in K 40:13 (word) mov ax, #BASE_MEM_IN_K mov 0x0413, ax ;; Manufacturing Test 40:12 ;; zerod out above ;; Warm Boot Flag 0040:0072 ;; value of 1234h = skip memory checks ;; zerod out above ;; EBDA setup call ebda_post ;; PIT setup SET_INT_VECTOR(0x08, #0xF000, #int08_handler) ;; int 1C already points at dummy_iret_handler (above) mov al, #0x34 ; timer0: binary count, 16bit count, mode 2 out PORT_PIT_MODE, al mov al, #0x00 ; maximum count of 0000H = 18.2Hz out PORT_PIT_COUNTER0, al out PORT_PIT_COUNTER0, al ;; Keyboard SET_INT_VECTOR(0x09, #0xF000, #int09_handler) SET_INT_VECTOR(0x16, #0xF000, #int16_handler) xor ax, ax mov ds, ax mov 0x0417, al /* keyboard shift flags, set 1 */ mov 0x0418, al /* keyboard shift flags, set 2 */ mov 0x0419, al /* keyboard alt-numpad work area */ mov 0x0471, al /* keyboard ctrl-break flag */ mov 0x0497, al /* keyboard status flags 4 */ mov al, #0x10 mov 0x0496, al /* keyboard status flags 3 */ /* keyboard head of buffer pointer */ mov bx, #0x001E mov 0x041A, bx /* keyboard end of buffer pointer */ mov 0x041C, bx /* keyboard pointer to start of buffer */ mov bx, #0x001E mov 0x0480, bx /* keyboard pointer to end of buffer */ mov bx, #0x003E mov 0x0482, bx /* init the keyboard */ call _keyboard_init ;; mov CMOS Equipment Byte to BDA Equipment Word mov ax, 0x0410 mov al, #0x14 out PORT_CMOS_INDEX, al in al, PORT_CMOS_DATA mov 0x0410, ax ;; Parallel setup SET_INT_VECTOR(0x0F, #0xF000, #dummy_iret_handler) xor ax, ax mov ds, ax xor bx, bx mov cl, #0x14 ; timeout value mov dx, #0x378 ; Parallel I/O address, port 1 call detect_parport mov dx, #0x278 ; Parallel I/O address, port 2 call detect_parport shl bx, #0x0e mov ax, 0x410 ; Equipment word bits 14..15 determine # parallel ports and ax, #0x3fff or ax, bx ; set number of parallel ports mov 0x410, ax ;; Serial setup SET_INT_VECTOR(0x0C, #0xF000, #dummy_iret_handler) SET_INT_VECTOR(0x14, #0xF000, #int14_handler) xor bx, bx mov cl, #0x0a ; timeout value mov dx, #0x03f8 ; Serial I/O address, port 1 call detect_serial mov dx, #0x02f8 ; Serial I/O address, port 2 call detect_serial mov dx, #0x03e8 ; Serial I/O address, port 3 call detect_serial mov dx, #0x02e8 ; Serial I/O address, port 4 call detect_serial shl bx, #0x09 mov ax, 0x410 ; Equipment word bits 9..11 determine # serial ports and ax, #0xf1ff or ax, bx ; set number of serial port mov 0x410, ax ;; CMOS RTC SET_INT_VECTOR(0x1A, #0xF000, #int1a_handler) SET_INT_VECTOR(0x4A, #0xF000, #dummy_iret_handler) SET_INT_VECTOR(0x70, #0xF000, #int70_handler) ;; BIOS DATA AREA 0x4CE ??? call timer_tick_post ;; PS/2 mouse setup SET_INT_VECTOR(0x74, #0xF000, #int74_handler) ;; IRQ13 (FPU exception) setup SET_INT_VECTOR(0x75, #0xF000, #int75_handler) ;; Video setup SET_INT_VECTOR(0x10, #0xF000, #int10_handler) ;; PIC call post_init_pic #if BX_ROMBIOS32 call rombios32_init #else #if BX_PCIBIOS call pcibios_init_iomem_bases call pcibios_init_irqs #endif //BX_PCIBIOS #endif mov cx, #0xc000 ;; init vga bios mov ax, #0xc780 call rom_scan call _print_bios_banner ;; ;; Floppy setup ;; call floppy_drive_post ;; ;; Hard Drive setup ;; call hard_drive_post #if BX_USE_ATADRV ;; ;; ATA/ATAPI driver setup ;; call _ata_init call _ata_detect ;; #endif // BX_USE_ATADRV #if BX_ELTORITO_BOOT ;; ;; eltorito floppy/harddisk emulation from cd ;; call _cdemu_init ;; #endif // BX_ELTORITO_BOOT call _init_boot_vectors mov cx, #0xc800 ;; init option roms mov ax, #0xe000 call rom_scan #if BX_ELTORITO_BOOT call _interactive_bootkey #endif // BX_ELTORITO_BOOT sti ;; enable interrupts int #0x19 .org 0xe2c3 ; NMI Handler Entry Point nmi: ;; FIXME the NMI handler should not panic ;; but iret when called from int75 (fpu exception) call _nmi_handler_msg iret int75_handler: out 0xf0, al // clear irq13 call eoi_both_pics // clear interrupt int 2 // legacy nmi call iret ;------------------------------------------- ;- INT 13h Fixed Disk Services Entry Point - ;------------------------------------------- .org 0xe3fe ; INT 13h Fixed Disk Services Entry Point int13_handler: //JMPL(int13_relocated) jmp int13_relocated .org 0xe401 ; Fixed Disk Parameter Table ;---------- ;- INT19h - ;---------- .org 0xe6f2 ; INT 19h Boot Load Service Entry Point int19_handler: jmp int19_relocated ;------------------------------------------- ;- System BIOS Configuration Data Table ;------------------------------------------- .org BIOS_CONFIG_TABLE db 0x08 ; Table size (bytes) -Lo db 0x00 ; Table size (bytes) -Hi db SYS_MODEL_ID db SYS_SUBMODEL_ID db BIOS_REVISION ; Feature byte 1 ; b7: 1=DMA channel 3 used by hard disk ; b6: 1=2 interrupt controllers present ; b5: 1=RTC present ; b4: 1=BIOS calls int 15h/4Fh every key ; b3: 1=wait for extern event supported (Int 15h/41h) ; b2: 1=extended BIOS data area used ; b1: 0=AT or ESDI bus, 1=MicroChannel ; b0: 1=Dual bus (MicroChannel + ISA) db (0 << 7) | \ (1 << 6) | \ (1 << 5) | \ (BX_CALL_INT15_4F << 4) | \ (0 << 3) | \ (BX_USE_EBDA << 2) | \ (0 << 1) | \ (0 << 0) ; Feature byte 2 ; b7: 1=32-bit DMA supported ; b6: 1=int16h, function 9 supported ; b5: 1=int15h/C6h (get POS data) supported ; b4: 1=int15h/C7h (get mem map info) supported ; b3: 1=int15h/C8h (en/dis CPU) supported ; b2: 1=non-8042 kb controller ; b1: 1=data streaming supported ; b0: reserved db (0 << 7) | \ (1 << 6) | \ (0 << 5) | \ (0 << 4) | \ (0 << 3) | \ (0 << 2) | \ (0 << 1) | \ (0 << 0) ; Feature byte 3 ; b7: not used ; b6: reserved ; b5: reserved ; b4: POST supports ROM-to-RAM enable/disable ; b3: SCSI on system board ; b2: info panel installed ; b1: Initial Machine Load (IML) system - BIOS on disk ; b0: SCSI supported in IML db 0x00 ; Feature byte 4 ; b7: IBM private ; b6: EEPROM present ; b5-3: ABIOS presence (011 = not supported) ; b2: private ; b1: memory split above 16Mb supported ; b0: POSTEXT directly supported by POST db 0x00 ; Feature byte 5 (IBM) ; b1: enhanced mouse ; b0: flash EPROM db 0x00 .org 0xe729 ; Baud Rate Generator Table ;---------- ;- INT14h - ;---------- .org 0xe739 ; INT 14h Serial Communications Service Entry Point int14_handler: push ds pusha xor ax, ax mov ds, ax call _int14_function popa pop ds iret ;---------------------------------------- ;- INT 16h Keyboard Service Entry Point - ;---------------------------------------- .org 0xe82e int16_handler: sti push ds pushf pusha cmp ah, #0x00 je int16_F00 cmp ah, #0x10 je int16_F00 mov bx, #0xf000 mov ds, bx call _int16_function popa popf pop ds jz int16_zero_set int16_zero_clear: push bp mov bp, sp //SEG SS and BYTE [bp + 0x06], #0xbf pop bp iret int16_zero_set: push bp mov bp, sp //SEG SS or BYTE [bp + 0x06], #0x40 pop bp iret int16_F00: mov bx, #0x0040 mov ds, bx int16_wait_for_key: cli mov bx, 0x001a cmp bx, 0x001c jne int16_key_found sti nop #if 0 /* no key yet, call int 15h, function AX=9002 */ 0x50, /* push AX */ 0xb8, 0x02, 0x90, /* mov AX, #0x9002 */ 0xcd, 0x15, /* int 15h */ 0x58, /* pop AX */ 0xeb, 0xea, /* jmp WAIT_FOR_KEY */ #endif jmp int16_wait_for_key int16_key_found: mov bx, #0xf000 mov ds, bx call _int16_function popa popf pop ds #if 0 /* notify int16 complete w/ int 15h, function AX=9102 */ 0x50, /* push AX */ 0xb8, 0x02, 0x91, /* mov AX, #0x9102 */ 0xcd, 0x15, /* int 15h */ 0x58, /* pop AX */ #endif iret ;------------------------------------------------- ;- INT09h : Keyboard Hardware Service Entry Point - ;------------------------------------------------- .org 0xe987 int09_handler: cli push ax mov al, #0xAD ;;disable keyboard out PORT_PS2_STATUS, al mov al, #0x0B out PORT_PIC1_CMD, al in al, PORT_PIC1_CMD and al, #0x02 jz int09_finish in al, PORT_PS2_DATA ;;read key from keyboard controller sti push ds pusha #ifdef BX_CALL_INT15_4F mov ah, #0x4f ;; allow for keyboard intercept stc int #0x15 jnc int09_done #endif ;; check for extended key cmp al, #0xe0 jne int09_check_pause xor ax, ax mov ds, ax mov al, BYTE [0x496] ;; mf2_state |= 0x02 or al, #0x02 mov BYTE [0x496], al jmp int09_done int09_check_pause: ;; check for pause key cmp al, #0xe1 jne int09_process_key xor ax, ax mov ds, ax mov al, BYTE [0x496] ;; mf2_state |= 0x01 or al, #0x01 mov BYTE [0x496], al jmp int09_done int09_process_key: mov bx, #0xf000 mov ds, bx call _int09_function int09_done: popa pop ds cli call eoi_master_pic int09_finish: mov al, #0xAE ;;enable keyboard out PORT_PS2_STATUS, al pop ax iret ;---------------------------------------- ;- INT 13h Diskette Service Entry Point - ;---------------------------------------- .org 0xec59 int13_diskette: jmp int13_noeltorito ;--------------------------------------------- ;- INT 0Eh Diskette Hardware ISR Entry Point - ;--------------------------------------------- .org 0xef57 ; INT 0Eh Diskette Hardware ISR Entry Point int0e_handler: push ax push dx mov dx, #0x03f4 in al, dx and al, #0xc0 cmp al, #0xc0 je int0e_normal mov dx, #0x03f5 mov al, #0x08 ; sense interrupt status out dx, al int0e_loop1: mov dx, #0x03f4 in al, dx and al, #0xc0 cmp al, #0xc0 jne int0e_loop1 int0e_loop2: mov dx, #0x03f5 in al, dx mov dx, #0x03f4 in al, dx and al, #0xc0 cmp al, #0xc0 je int0e_loop2 int0e_normal: push ds xor ax, ax ;; segment 0000 mov ds, ax call eoi_master_pic mov al, 0x043e or al, #0x80 ;; diskette interrupt has occurred mov 0x043e, al pop ds pop dx pop ax iret .org 0xefc7 ; Diskette Controller Parameter Table diskette_param_table: ;; Since no provisions are made for multiple drive types, most ;; values in this table are ignored. I set parameters for 1.44M ;; floppy here db 0xAF db 0x02 ;; head load time 0000001, DMA used db 0x25 db 0x02 db 18 db 0x1B db 0xFF db 0x6C db 0xF6 db 0x0F db 0x08 ;---------------------------------------- ;- INT17h : Printer Service Entry Point - ;---------------------------------------- .org 0xefd2 int17_handler: push ds pusha xor ax, ax mov ds, ax call _int17_function popa pop ds iret diskette_param_table2: ;; New diskette parameter table adding 3 parameters from IBM ;; Since no provisions are made for multiple drive types, most ;; values in this table are ignored. I set parameters for 1.44M ;; floppy here db 0xAF db 0x02 ;; head load time 0000001, DMA used db 0x25 db 0x02 db 18 db 0x1B db 0xFF db 0x6C db 0xF6 db 0x0F db 0x08 db 79 ;; maximum track db 0 ;; data transfer rate db 4 ;; drive type in cmos .org 0xf045 ; INT 10 Functions 0-Fh Entry Point HALT(__LINE__) iret ;---------- ;- INT10h - ;---------- .org 0xf065 ; INT 10h Video Support Service Entry Point int10_handler: ;; dont do anything, since the VGA BIOS handles int10h requests iret .org 0xf0a4 ; MDA/CGA Video Parameter Table (INT 1Dh) ;---------- ;- INT12h - ;---------- .org 0xf841 ; INT 12h Memory Size Service Entry Point ; ??? different for Pentium (machine check)? int12_handler: push ds mov ax, #0x0040 mov ds, ax mov ax, 0x0013 pop ds iret ;---------- ;- INT11h - ;---------- .org 0xf84d ; INT 11h Equipment List Service Entry Point int11_handler: push ds mov ax, #0x0040 mov ds, ax mov ax, 0x0010 pop ds iret ;---------- ;- INT15h - ;---------- .org 0xf859 ; INT 15h System Services Entry Point int15_handler: pushf #if BX_APM cmp ah, #0x53 je apm_call #endif push ds push es cmp ah, #0x86 je int15_handler32 cmp ah, #0xE8 je int15_handler32 pusha #if BX_USE_PS2_MOUSE cmp ah, #0xC2 je int15_handler_mouse #endif call _int15_function int15_handler_mouse_ret: popa int15_handler32_ret: pop es pop ds popf jmp iret_modify_cf #if BX_APM apm_call: jmp _apmreal_entry #endif #if BX_USE_PS2_MOUSE int15_handler_mouse: call _int15_function_mouse jmp int15_handler_mouse_ret #endif int15_handler32: pushad call _int15_function32 popad jmp int15_handler32_ret ;; Protected mode IDT descriptor ;; ;; I just make the limit 0, so the machine will shutdown ;; if an exception occurs during protected mode memory ;; transfers. ;; ;; Set base to f0000 to correspond to beginning of BIOS, ;; in case I actually define an IDT later ;; Set limit to 0 pmode_IDT_info: dw 0x0000 ;; limit 15:00 dw 0x0000 ;; base 15:00 db 0x0f ;; base 23:16 ;; Real mode IDT descriptor ;; ;; Set to typical real-mode values. ;; base = 000000 ;; limit = 03ff rmode_IDT_info: dw 0x03ff ;; limit 15:00 dw 0x0000 ;; base 15:00 db 0x00 ;; base 23:16 ;---------- ;- INT1Ah - ;---------- .org 0xfe6e ; INT 1Ah Time-of-day Service Entry Point int1a_handler: #if BX_PCIBIOS cmp ah, #0xb1 jne int1a_normal call pcibios_real jc pcibios_error retf 2 pcibios_error: mov bl, ah mov ah, #0xb1 push ds pusha mov ax, ss ; set readable descriptor to ds, for calling pcibios mov ds, ax ; on 16bit protected mode. jmp int1a_callfunction int1a_normal: #endif push ds pusha xor ax, ax mov ds, ax int1a_callfunction: call _int1a_function popa pop ds iret ;; ;; int70h: IRQ8 - CMOS RTC ;; int70_handler: push ds pushad xor ax, ax mov ds, ax call _int70_function popad pop ds iret ;--------- ;- INT08 - ;--------- .org 0xfea5 ; INT 08h System Timer ISR Entry Point int08_handler: sti push eax push ds xor ax, ax mov ds, ax ;; time to turn off drive(s)? mov al,0x0440 or al,al jz int08_floppy_off dec al mov 0x0440,al jnz int08_floppy_off ;; turn motor(s) off push dx mov dx,#0x03f2 in al,dx and al,#0xcf out dx,al pop dx int08_floppy_off: mov eax, 0x046c ;; get ticks dword inc eax ;; compare eax to one days worth of timer ticks at 18.2 hz cmp eax, #0x001800B0 jb int08_store_ticks ;; there has been a midnight rollover at this point xor eax, eax ;; zero out counter inc BYTE 0x0470 ;; increment rollover flag int08_store_ticks: mov 0x046c, eax ;; store new ticks dword ;; chain to user timer tick INT #0x1c //pushf //;; call_ep [ds:loc] //CALL_EP( 0x1c << 2 ) int #0x1c cli call eoi_master_pic pop ds pop eax iret .org 0xfef3 ; Initial Interrupt Vector Offsets Loaded by POST .org 0xff00 .ascii BIOS_COPYRIGHT_STRING ;------------------------------------------------ ;- IRET Instruction for Dummy Interrupt Handler - ;------------------------------------------------ .org 0xff53 ; IRET Instruction for Dummy Interrupt Handler dummy_iret_handler: iret .org 0xff54 ; INT 05h Print Screen Service Entry Point HALT(__LINE__) iret .org 0xfff0 ; Power-up Entry Point jmp 0xf000:post .org 0xfff5 ; ASCII Date ROM was built - 8 characters in MM/DD/YY .ascii BIOS_BUILD_DATE .org 0xfffe ; System Model ID db SYS_MODEL_ID db 0x00 ; filler .org 0xfa6e ;; Character Font for 320x200 & 640x200 Graphics (lower 128 characters) ASM_END /* * This font comes from the fntcol16.zip package (c) by Joseph Gil * found at ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip * This font is public domain */ static Bit8u vgafont8[128*8]= { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0xbd, 0x99, 0x81, 0x7e, 0x7e, 0xff, 0xdb, 0xff, 0xc3, 0xe7, 0xff, 0x7e, 0x6c, 0xfe, 0xfe, 0xfe, 0x7c, 0x38, 0x10, 0x00, 0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00, 0x38, 0x7c, 0x38, 0xfe, 0xfe, 0x7c, 0x38, 0x7c, 0x10, 0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x7c, 0x00, 0x00, 0x18, 0x3c, 0x3c, 0x18, 0x00, 0x00, 0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff, 0x00, 0x3c, 0x66, 0x42, 0x42, 0x66, 0x3c, 0x00, 0xff, 0xc3, 0x99, 0xbd, 0xbd, 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0x76, 0x66, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x7c, 0xc0, 0x78, 0x0c, 0xf8, 0x00, 0x10, 0x30, 0x7c, 0x30, 0x30, 0x34, 0x18, 0x00, 0x00, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0xcc, 0xcc, 0xcc, 0x78, 0x30, 0x00, 0x00, 0x00, 0xc6, 0xd6, 0xfe, 0xfe, 0x6c, 0x00, 0x00, 0x00, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0xcc, 0xcc, 0xcc, 0x7c, 0x0c, 0xf8, 0x00, 0x00, 0xfc, 0x98, 0x30, 0x64, 0xfc, 0x00, 0x1c, 0x30, 0x30, 0xe0, 0x30, 0x30, 0x1c, 0x00, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00, 0xe0, 0x30, 0x30, 0x1c, 0x30, 0x30, 0xe0, 0x00, 0x76, 0xdc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0x00, }; ASM_START .org 0xcc00 bios_table_area_end: // bcc-generated data will be placed here ASM_END