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Bochs/bochs/load32bitOShack.cc

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// 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;
}
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