- boot sequence with up to 3 boot devices inplemented. The sequence is stored
in the CMOS regs 0x3d and 0x38. TODO: change config option "boot" to use this feature.
This commit is contained in:
Volker Ruppert
parent
80ee150d83
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a15de4430b
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@ -1,5 +1,5 @@
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/////////////////////////////////////////////////////////////////////////
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// $Id: rombios.c,v 1.120 2004-10-04 19:28:55 vruppert Exp $
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// $Id: rombios.c,v 1.121 2004-10-15 15:34:44 vruppert Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2002 MandrakeSoft S.A.
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@ -120,10 +120,6 @@
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// - Fix all "FIXME ElTorito Various"
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// - should be able to boot any cdrom instead of the first one
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//
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// Boot
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// - the bios should try to boot from different devices.
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// Use cmos regs 0x3d & high nibble of 0x38 to store up to 3 boot devices from 16
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//
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// BCC Bug: find a generic way to handle the bug of #asm after an "if" (fixed in 0.16.7)
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#define DEBUG_ROMBIOS 0
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@ -916,10 +912,10 @@ Bit16u cdrom_boot();
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#endif // BX_ELTORITO_BOOT
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static char bios_cvs_version_string[] = "$Revision: 1.120 $";
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static char bios_date_string[] = "$Date: 2004-10-04 19:28:55 $";
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static char bios_cvs_version_string[] = "$Revision: 1.121 $";
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static char bios_date_string[] = "$Date: 2004-10-15 15:34:44 $";
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static char CVSID[] = "$Id: rombios.c,v 1.120 2004-10-04 19:28:55 vruppert Exp $";
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static char CVSID[] = "$Id: rombios.c,v 1.121 2004-10-15 15:34:44 vruppert Exp $";
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/* Offset to skip the CVS $Id: prefix */
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#define bios_version_string (CVSID + 4)
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@ -1765,14 +1761,15 @@ print_boot_device(cdboot, drive)
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// displays the reason why boot failed
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//--------------------------------------------------------------------------
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void
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print_boot_failure(cdboot, drive, reason)
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Bit8u cdboot; Bit8u drive;
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print_boot_failure(cdboot, drive, reason, lastdrive)
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Bit8u cdboot; Bit8u drive; Bit8u lastdrive;
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{
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Bit16u drivenum = drive&0x7f;
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// cdboot: 1 if boot from cd, 0 otherwise
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// drive : drive number
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// reason: 0 signature check failed, 1 read error
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// lastdrive: 1 boot drive is the last one in boot sequence
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if (cdboot)
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bios_printf(BIOS_PRINTF_INFO | BIOS_PRINTF_SCREEN, "Boot from %s failed\n",drivetypes[2]);
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@ -1781,10 +1778,12 @@ print_boot_failure(cdboot, drive, reason)
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else
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bios_printf(BIOS_PRINTF_INFO | BIOS_PRINTF_SCREEN, "Boot from %s %d failed\n", drivetypes[0],drivenum);
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if (reason==0)
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BX_PANIC("Not a bootable disk\n");
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else
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BX_PANIC("Could not read the boot disk\n");
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if (lastdrive==1) {
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if (reason==0)
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BX_PANIC("Not a bootable disk\n");
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else
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BX_PANIC("Could not read the boot disk\n");
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}
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}
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//--------------------------------------------------------------------------
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@ -7299,15 +7298,17 @@ int17_function(regs, ds, iret_addr)
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// returns bootsegment in ax, drive in bl
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Bit32u
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int19_function()
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int19_function(bseqnr)
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Bit8u bseqnr;
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{
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Bit16u ebda_seg=read_word(0x0040,0x000E);
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Bit8u bootseq;
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Bit16u bootseq;
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Bit8u bootdrv;
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Bit8u bootcd;
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Bit8u bootchk;
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Bit16u bootseg;
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Bit16u status;
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Bit8u lastdrive=0;
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// if BX_ELTORITO_BOOT is not defined, old behavior
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// check bit 5 in CMOS reg 0x2d. load either 0x00 or 0x80 into DL
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@ -7315,25 +7316,39 @@ int19_function()
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// 0: system boot sequence, first drive C: then A:
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// 1: system boot sequence, first drive A: then C:
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// else BX_ELTORITO_BOOT is defined
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// CMOS reg 0x3D contains the boot device :
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// 0x01 : floppy
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// 0x02 : harddrive
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// 0x03 : cdrom
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// else : floppy for now.
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// CMOS regs 0x3D and 0x38 contain the boot sequence:
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// CMOS reg 0x3D & 0x0f : 1st boot device
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// CMOS reg 0x3D & 0xf0 : 2nd boot device
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// CMOS reg 0x38 & 0xf0 : 3rd boot device
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// boot device codes:
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// 0x00 : not defined
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// 0x01 : first floppy
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// 0x02 : first harddrive
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// 0x03 : first cdrom
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// else : boot failure
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// Get the boot sequence
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#if BX_ELTORITO_BOOT
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bootseq=inb_cmos(0x3d);
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bootseq|=((inb_cmos(0x38) & 0xf0) << 4);
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if (bseqnr==2) bootseq >>= 4;
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if (bseqnr==3) bootseq >>= 8;
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if (bootseq<0x10) lastdrive = 1;
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bootdrv=0x00; bootcd=0;
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switch(bootseq) {
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switch(bootseq & 0x0f) {
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case 0x01: bootdrv=0x00; bootcd=0; break;
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case 0x02: bootdrv=0x80; bootcd=0; break;
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case 0x03: bootdrv=0x00; bootcd=1; break;
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default: return 0x00000000;
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}
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#else
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bootseq=inb_cmos(0x2d);
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if (bseqnr==2) {
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bootseq ^= 0x20;
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lastdrive = 1;
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}
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bootdrv=0x00; bootcd=0;
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if((bootseq&0x20)==0) bootdrv=0x80;
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#endif // BX_ELTORITO_BOOT
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@ -7346,7 +7361,7 @@ int19_function()
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// If failure
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if ( (status & 0x00ff) !=0 ) {
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print_cdromboot_failure(status);
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print_boot_failure(bootcd, bootdrv, 1);
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print_boot_failure(bootcd, bootdrv, 1, lastdrive);
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return 0x00000000;
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}
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@ -7385,7 +7400,7 @@ int19_load_done:
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ASM_END
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if (status != 0) {
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print_boot_failure(bootcd, bootdrv, 1);
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print_boot_failure(bootcd, bootdrv, 1, lastdrive);
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return 0x00000000;
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}
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}
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@ -7394,7 +7409,7 @@ ASM_END
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// bootchk = 1 : signature check disabled
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// bootchk = 0 : signature check enabled
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if (bootdrv != 0) bootchk = 0;
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else bootchk = inb_cmos(0x38);
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else bootchk = inb_cmos(0x38) & 0x01;
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#if BX_ELTORITO_BOOT
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// if boot from cd, no signature check
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@ -7404,7 +7419,7 @@ ASM_END
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if (bootchk == 0) {
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if (read_word(bootseg,0x1fe) != 0xaa55) {
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print_boot_failure(bootcd, bootdrv, 0);
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print_boot_failure(bootcd, bootdrv, 0, lastdrive);
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return 0x00000000;
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}
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}
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@ -7602,7 +7617,7 @@ int1a_function(regs, ds, iret_addr)
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// real mode PCI BIOS functions now handled in assembler code
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// this C code handles the error code for information only
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if (regs.u.r8.al == 0xff) {
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BX_INFO("PCI BIOS not present\n");
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BX_INFO("PCI BIOS: PCI not present\n");
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} else if (regs.u.r8.al == 0x81) {
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BX_INFO("unsupported PCI BIOS function 0x%02x\n", regs.u.r8.al);
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} else if (regs.u.r8.al == 0x83) {
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@ -7906,13 +7921,37 @@ int19_relocated: ;; Boot function, relocated
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xor ax, ax
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mov ds, ax
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;; 1st boot device
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mov ax, #0x0001
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push ax
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call _int19_function
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inc sp
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inc sp
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;; bl contains the boot drive
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;; ax contains the boot segment or 0 if failure
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test ax, ax ;; if ax is 0 try next boot device
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jnz boot_setup
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;; 2nd boot device
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mov ax, #0x0002
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push ax
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call _int19_function
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inc sp
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inc sp
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test ax, ax ;; if ax is 0 try next boot device
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jnz boot_setup
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;; 3rd boot device
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mov ax, #0x0003
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push ax
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call _int19_function
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inc sp
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inc sp
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test ax, ax ;; if ax is 0 call int18
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jz int18_handler
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boot_setup:
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mov dl, bl ;; set drive so guest os find it
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shl eax, #0x04 ;; convert seg to ip
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mov 2[bp], ax ;; set ip
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