306 lines
8.7 KiB
C++
306 lines
8.7 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: load32bitOShack.cc,v 1.7 2001-10-03 13:10:37 bdenney Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include "bochs.h"
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#define LOG_THIS genlog->
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static void bx_load_linux_hack(void);
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static void bx_load_null_kernel_hack(void);
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static Bit32u bx_load_kernel_image(char *path, Bit32u paddr);
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void
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bx_load32bitOSimagehack(void)
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{
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// Replay IO from log to initialize IO devices to
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// a reasonable state needed for the OS. This is done
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// in lieu of running the 16-bit BIOS to init things,
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// since we want to test straight 32bit stuff for
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// freemware.
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FILE *fp;
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fp = fopen(bx_options.load32bitOSImage.Oiolog->getptr (), "r");
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if (fp == NULL) {
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BX_PANIC(("could not open IO init file."));
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}
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while (1) {
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unsigned len, op, port, val;
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int ret;
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ret = fscanf(fp, "%u %u %x %x\n",
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&len, &op, &port, &val);
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if (ret != 4) {
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BX_PANIC(("could not open IO init file."));
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}
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if (op == 0) {
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// read
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(void) bx_devices.inp(port, len);
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}
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else if (op == 1) {
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// write
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bx_devices.outp(port, val, len);
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}
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else {
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BX_PANIC(("bad IO op in init filen"));
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}
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if (feof(fp)) break;
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}
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// Invoke proper hack depending on which OS image we're loading
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switch (bx_options.load32bitOSImage.OwhichOS->get ()) {
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case Load32bitOSLinux:
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bx_load_linux_hack();
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break;
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case Load32bitOSNullKernel:
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bx_load_null_kernel_hack();
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break;
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default:
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BX_PANIC(("load32bitOSImage: OS not recognized"));
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}
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}
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struct gdt_entry
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{
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Bit32u low;
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Bit32u high;
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};
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struct linux_setup_params
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{
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/* 0x000 */ Bit8u orig_x;
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/* 0x001 */ Bit8u orig_y;
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/* 0x002 */ Bit16u memory_size_std;
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/* 0x004 */ Bit16u orig_video_page;
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/* 0x006 */ Bit8u orig_video_mode;
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/* 0x007 */ Bit8u orig_video_cols;
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/* 0x008 */ Bit16u unused1;
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/* 0x00a */ Bit16u orig_video_ega_bx;
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/* 0x00c */ Bit16u unused2;
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/* 0x00e */ Bit8u orig_video_lines;
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/* 0x00f */ Bit8u orig_video_isVGA;
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/* 0x010 */ Bit16u orig_video_points;
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/* 0x012 */ Bit8u pad1[0x40 - 0x12];
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/* 0x040 */ Bit8u apm_info[0x80 - 0x40];
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/* 0x080 */ Bit8u hd0_info[16];
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/* 0x090 */ Bit8u hd1_info[16];
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/* 0x0a0 */ Bit8u pad2[0x1e0 - 0xa0];
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/* 0x1e0 */ Bit32u memory_size_ext;
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/* 0x1e4 */ Bit8u pad3[0x1f1 - 0x1e4];
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/* 0x1f1 */ Bit8u setup_sects;
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/* 0x1f2 */ Bit16u mount_root_rdonly;
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/* 0x1f4 */ Bit16u sys_size;
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/* 0x1f6 */ Bit16u swap_dev;
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/* 0x1f8 */ Bit16u ramdisk_flags;
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/* 0x1fa */ Bit16u vga_mode;
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/* 0x1fc */ Bit16u orig_root_dev;
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/* 0x1fe */ Bit16u bootsect_magic;
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/* 0x200 */ Bit8u pad4[0x210 - 0x200];
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/* 0x210 */ Bit32u loader_type;
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/* 0x214 */ Bit32u kernel_start;
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/* 0x218 */ Bit32u initrd_start;
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/* 0x21c */ Bit32u initrd_size;
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/* 0x220 */ Bit8u pad5[0x400 - 0x220];
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/* 0x400 */ struct gdt_entry gdt[128];
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/* 0x800 */ Bit8u commandline[2048];
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};
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static void
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bx_load_linux_setup_params( Bit32u initrd_start, Bit32u initrd_size )
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{
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BX_MEM_C *mem = BX_MEM(0);
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struct linux_setup_params *params =
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(struct linux_setup_params *) &mem->vector[0x00090000];
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memset( params, '\0', sizeof(*params) );
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/* Video settings (standard VGA) */
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params->orig_x = 0;
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params->orig_y = 0;
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params->orig_video_page = 0;
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params->orig_video_mode = 3;
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params->orig_video_cols = 80;
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params->orig_video_lines = 25;
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params->orig_video_points = 16;
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params->orig_video_isVGA = 1;
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params->orig_video_ega_bx = 3;
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/* Memory size (total mem - 1MB, in KB) */
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params->memory_size_ext = (mem->megabytes - 1) * 1024;
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/* Boot parameters */
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params->loader_type = 1;
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params->bootsect_magic = 0xaa55;
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params->mount_root_rdonly = 0;
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params->orig_root_dev = 0x0100;
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params->initrd_start = initrd_start;
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params->initrd_size = initrd_size;
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/* Initial GDT */
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params->gdt[2].high = 0x00cf9a00;
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params->gdt[2].low = 0x0000ffff;
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params->gdt[3].high = 0x00cf9200;
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params->gdt[3].low = 0x0000ffff;
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}
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void
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bx_load_linux_hack(void)
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{
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Bit32u initrd_start = 0, initrd_size = 0;
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// The RESET function will have been called first.
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// Set CPU and memory features which are assumed at this point.
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// Load Linux kernel image
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bx_load_kernel_image( bx_options.load32bitOSImage.Opath->getptr (), 0x100000 );
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// Load initial ramdisk image if requested
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if ( bx_options.load32bitOSImage.Oinitrd->getptr () )
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{
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initrd_start = 0x00800000; /* FIXME: load at top of memory */
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initrd_size = bx_load_kernel_image( bx_options.load32bitOSImage.Oinitrd->getptr (), initrd_start );
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}
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// Setup Linux startup parameters buffer
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bx_load_linux_setup_params( initrd_start, initrd_size );
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// Enable A20 line
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BX_SET_ENABLE_A20( 1 );
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// Setup PICs the way Linux likes it
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BX_OUTP( 0x20, 0x11, 1 );
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BX_OUTP( 0xA0, 0x11, 1 );
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BX_OUTP( 0x21, 0x20, 1 );
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BX_OUTP( 0xA1, 0x28, 1 );
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BX_OUTP( 0x21, 0x04, 1 );
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BX_OUTP( 0xA1, 0x02, 1 );
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BX_OUTP( 0x21, 0x01, 1 );
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BX_OUTP( 0xA1, 0x01, 1 );
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BX_OUTP( 0x21, 0xFF, 1 );
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BX_OUTP( 0xA1, 0xFB, 1 );
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// Disable interrupts and NMIs
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BX_CPU(0)->eflags.if_ = 0;
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BX_OUTP( 0x70, 0x80, 1 );
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// Enter protected mode
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BX_CPU(0)->cr0.pe = 1;
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BX_CPU(0)->cr0.val32 |= 0x01;
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// Set up initial GDT
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BX_CPU(0)->gdtr.limit = 0x400;
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BX_CPU(0)->gdtr.base = 0x00090400;
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// Jump to protected mode entry point
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BX_CPU(0)->jump_protected( NULL, 0x10, 0x00100000 );
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}
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void
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bx_load_null_kernel_hack(void)
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{
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// The RESET function will have been called first.
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// Set CPU and memory features which are assumed at this point.
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bx_load_kernel_image(bx_options.load32bitOSImage.Opath->getptr (), 0x100000);
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// EIP deltas
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BX_CPU(0)->prev_eip =
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BX_CPU(0)->eip = 0x00100000;
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// CS deltas
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BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.base = 0x00000000;
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BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.limit = 0xFFFFF;
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BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF;
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BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; // page gran
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BX_CPU(0)->sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 1; // 32bit
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// DS deltas
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BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.base = 0x00000000;
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BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.limit = 0xFFFFF;
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BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.limit_scaled = 0xFFFFFFFF;
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BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.g = 1; // page gran
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BX_CPU(0)->sregs[BX_SEG_REG_DS].cache.u.segment.d_b = 1; // 32bit
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// CR0 deltas
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BX_CPU(0)->cr0.pe = 1; // protected mode
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}
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Bit32u
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bx_load_kernel_image(char *path, Bit32u paddr)
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{
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struct stat stat_buf;
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int fd, ret;
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unsigned long size, offset;
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Bit32u page_size;
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// read in ROM BIOS image file
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fd = open(path, O_RDONLY
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#ifdef O_BINARY
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| O_BINARY
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#endif
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);
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if (fd < 0) {
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BX_INFO(( "load_kernel_image: couldn't open image file '%s'.", path ));
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exit(1);
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}
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ret = fstat(fd, &stat_buf);
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if (ret) {
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BX_INFO(( "load_kernel_image: couldn't stat image file '%s'.", path ));
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exit(1);
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}
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size = stat_buf.st_size;
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page_size = ((Bit32u)size + 0xfff) & ~0xfff;
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BX_MEM_C *mem = BX_MEM(0);
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if ( (paddr + size) > mem->len ) {
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BX_INFO(( "load_kernel_image: address range > physical memsize!" ));
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exit(1);
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}
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offset = 0;
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while (size > 0) {
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ret = read(fd, (bx_ptr_t) &mem->vector[paddr + offset], size);
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if (ret <= 0) {
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BX_INFO(( "load_kernel_image: read failed on image" ));
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exit(1);
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}
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size -= ret;
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offset += ret;
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}
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close(fd);
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BX_INFO(( "#(%u) load_kernel_image: '%s', size=%u read into memory at %08x",
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BX_SIM_ID, path,
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(unsigned) stat_buf.st_size,
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(unsigned) paddr ));
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return page_size;
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}
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