// Copyright (C) 2001 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #include "bochs.h" #define LOG_THIS genlog-> static void bx_load_linux_hack(void); static void bx_load_null_kernel_hack(void); static Bit32u bx_load_kernel_image(char *path, Bit32u paddr); void bx_load32bitOSimagehack(void) { // Replay IO from log to initialize IO devices to // a reasonable state needed for the OS. This is done // in lieu of running the 16-bit BIOS to init things, // since we want to test straight 32bit stuff for // freemware. FILE *fp; fp = fopen(bx_options.load32bitOSImage.Oiolog->getptr (), "r"); if (fp == NULL) { BX_PANIC(("could not open IO init file.")); } while (1) { unsigned len, op, port, val; int ret; ret = fscanf(fp, "%u %u %x %x\n", &len, &op, &port, &val); if (ret != 4) { BX_PANIC(("could not open IO init file.")); } if (op == 0) { // read (void) bx_devices.inp(port, len); } else if (op == 1) { // write bx_devices.outp(port, val, len); } else { BX_PANIC(("bad IO op in init filen")); } if (feof(fp)) break; } // Invoke proper hack depending on which OS image we're loading switch (bx_options.load32bitOSImage.OwhichOS->get ()) { case Load32bitOSLinux: bx_load_linux_hack(); break; case Load32bitOSNullKernel: bx_load_null_kernel_hack(); break; default: BX_PANIC(("load32bitOSImage: OS not recognized")); } } struct gdt_entry { Bit32u low; Bit32u high; }; struct linux_setup_params { /* 0x000 */ Bit8u orig_x; /* 0x001 */ Bit8u orig_y; /* 0x002 */ Bit16u memory_size_std; /* 0x004 */ Bit16u orig_video_page; /* 0x006 */ Bit8u orig_video_mode; /* 0x007 */ Bit8u orig_video_cols; /* 0x008 */ Bit16u unused1; /* 0x00a */ Bit16u orig_video_ega_bx; /* 0x00c */ Bit16u unused2; /* 0x00e */ Bit8u orig_video_lines; /* 0x00f */ Bit8u orig_video_isVGA; /* 0x010 */ Bit16u orig_video_points; /* 0x012 */ Bit8u pad1[0x40 - 0x12]; /* 0x040 */ Bit8u apm_info[0x80 - 0x40]; /* 0x080 */ Bit8u hd0_info[16]; /* 0x090 */ Bit8u hd1_info[16]; /* 0x0a0 */ Bit8u pad2[0x1e0 - 0xa0]; /* 0x1e0 */ Bit32u memory_size_ext; /* 0x1e4 */ Bit8u pad3[0x1f1 - 0x1e4]; /* 0x1f1 */ Bit8u setup_sects; /* 0x1f2 */ Bit16u mount_root_rdonly; /* 0x1f4 */ Bit16u sys_size; /* 0x1f6 */ Bit16u swap_dev; /* 0x1f8 */ Bit16u ramdisk_flags; /* 0x1fa */ Bit16u vga_mode; /* 0x1fc */ Bit16u orig_root_dev; /* 0x1fe */ Bit16u bootsect_magic; /* 0x200 */ Bit8u pad4[0x210 - 0x200]; /* 0x210 */ Bit32u loader_type; /* 0x214 */ Bit32u kernel_start; /* 0x218 */ Bit32u initrd_start; /* 0x21c */ Bit32u initrd_size; /* 0x220 */ Bit8u pad5[0x400 - 0x220]; /* 0x400 */ struct gdt_entry gdt[128]; /* 0x800 */ Bit8u commandline[2048]; }; static void bx_load_linux_setup_params( Bit32u initrd_start, Bit32u initrd_size ) { BX_MEM_C *mem = BX_MEM(0); struct linux_setup_params *params = (struct linux_setup_params *) &mem->vector[0x00090000]; memset( params, '\0', sizeof(*params) ); /* Video settings (standard VGA) */ params->orig_x = 0; params->orig_y = 0; params->orig_video_page = 0; params->orig_video_mode = 3; params->orig_video_cols = 80; params->orig_video_lines = 25; params->orig_video_points = 16; params->orig_video_isVGA = 1; params->orig_video_ega_bx = 3; /* Memory size (total mem - 1MB, in KB) */ params->memory_size_ext = (mem->megabytes - 1) * 1024; /* Boot parameters */ params->loader_type = 1; params->bootsect_magic = 0xaa55; params->mount_root_rdonly = 0; params->orig_root_dev = 0x0100; params->initrd_start = initrd_start; params->initrd_size = initrd_size; /* Initial GDT */ params->gdt[2].high = 0x00cf9a00; params->gdt[2].low = 0x0000ffff; params->gdt[3].high = 0x00cf9200; params->gdt[3].low = 0x0000ffff; } void bx_load_linux_hack(void) { Bit32u initrd_start = 0, initrd_size = 0; // The RESET function will have been called first. // Set CPU and memory features which are assumed at this point. // Load Linux kernel image bx_load_kernel_image( bx_options.load32bitOSImage.Opath->getptr (), 0x100000 ); // Load initial ramdisk image if requested if ( bx_options.load32bitOSImage.Oinitrd->getptr () ) { initrd_start = 0x00800000; /* FIXME: load at top of memory */ initrd_size = bx_load_kernel_image( bx_options.load32bitOSImage.Oinitrd->getptr (), initrd_start ); } // Setup Linux startup parameters buffer bx_load_linux_setup_params( initrd_start, initrd_size ); // Enable A20 line BX_SET_ENABLE_A20( 1 ); // Setup PICs the way Linux likes it BX_OUTP( 0x20, 0x11, 1 ); BX_OUTP( 0xA0, 0x11, 1 ); BX_OUTP( 0x21, 0x20, 1 ); BX_OUTP( 0xA1, 0x28, 1 ); BX_OUTP( 0x21, 0x04, 1 ); BX_OUTP( 0xA1, 0x02, 1 ); BX_OUTP( 0x21, 0x01, 1 ); BX_OUTP( 0xA1, 0x01, 1 ); BX_OUTP( 0x21, 0xFF, 1 ); BX_OUTP( 0xA1, 0xFB, 1 ); // Disable interrupts and NMIs BX_CPU(0)->eflags.if_ = 0; BX_OUTP( 0x70, 0x80, 1 ); // Enter protected mode BX_CPU(0)->cr0.pe = 1; BX_CPU(0)->cr0.val32 |= 0x01; // Set up initial GDT BX_CPU(0)->gdtr.limit = 0x400; BX_CPU(0)->gdtr.base = 0x00090400; // Jump to protected mode entry point BX_CPU(0)->jump_protected( NULL, 0x10, 0x00100000 ); } void bx_load_null_kernel_hack(void) { // The RESET function will have been called first. // Set CPU and memory features which are assumed at this point. bx_load_kernel_image(bx_options.load32bitOSImage.Opath->getptr (), 0x100000); // EIP deltas BX_CPU(0)->prev_eip = BX_CPU(0)->eip = 0x00100000; // CS deltas BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.base = 0x00000000; BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.limit = 0xFFFFF; BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; // page gran BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 1; // 32bit // DS deltas BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.base = 0x00000000; BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.limit = 0xFFFFF; BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.limit_scaled = 0xFFFFFFFF; BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.g = 1; // page gran BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.d_b = 1; // 32bit // CR0 deltas BX_CPU(0)->cr0.pe = 1; // protected mode } Bit32u bx_load_kernel_image(char *path, Bit32u paddr) { struct stat stat_buf; int fd, ret; unsigned long size, offset; Bit32u page_size; // read in ROM BIOS image file fd = open(path, O_RDONLY #ifdef O_BINARY | O_BINARY #endif ); if (fd < 0) { BX_INFO(( "load_kernel_image: couldn't open image file '%s'.", path )); exit(1); } ret = fstat(fd, &stat_buf); if (ret) { BX_INFO(( "load_kernel_image: couldn't stat image file '%s'.", path )); exit(1); } size = stat_buf.st_size; page_size = ((Bit32u)size + 0xfff) & ~0xfff; BX_MEM_C *mem = BX_MEM(0); if ( (paddr + size) > mem->len ) { BX_INFO(( "load_kernel_image: address range > physical memsize!" )); exit(1); } offset = 0; while (size > 0) { ret = read(fd, (bx_ptr_t) &mem->vector[paddr + offset], size); if (ret <= 0) { BX_INFO(( "load_kernel_image: read failed on image" )); exit(1); } size -= ret; offset += ret; } close(fd); BX_INFO(( "#(%u) load_kernel_image: '%s', size=%u read into memory at %08x", BX_SIM_ID, path, (unsigned) stat_buf.st_size, (unsigned) paddr )); return page_size; }