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elilo/ia32/system.c

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/*
* Copyright (C) 2001-2003 Hewlett-Packard Co.
* Contributed by Stephane Eranian <eranian@hpl.hp.com>
* Contributed by Mike Johnston <johnston@intel.com>
* Contributed by Chris Ahna <christopher.j.ahna@intel.com>
*
* This file is part of the ELILO, the EFI Linux boot loader.
*
* ELILO is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* ELILO 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ELILO; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Please check out the elilo.txt for complete documentation on how
* to use this program.
*/
/*
* This file contains all the IA-32 specific code expected by generic loader
*/
#include <efi.h>
#include <efilib.h>
#include "elilo.h"
#include "loader.h"
#include "rmswitch.h"
extern loader_ops_t bzimage_loader, plain_loader, gzip_loader;
/*
* Descriptor table base addresses & limits for Linux startup.
*/
dt_addr_t gdt_addr = { 0x800, 0x94000 };
dt_addr_t idt_addr = { 0, 0 };
/*
* Initial GDT layout for Linux startup.
*/
UINT16 init_gdt[] = {
/* gdt[0]: dummy */
0, 0, 0, 0,
/* gdt[1]: unused */
0, 0, 0, 0,
/* gdt[2]: code */
0xFFFF, /* 4Gb - (0x100000*0x1000 = 4Gb) */
0x0000, /* base address=0 */
0x9A00, /* code read/exec */
0x00CF, /* granularity=4096, 386 (+5th nibble of limit) */
/* gdt[3]: data */
0xFFFF, /* 4Gb - (0x100000*0x1000 = 4Gb) */
0x0000, /* base address=0 */
0x9200, /* data read/write */
0x00CF, /* granularity=4096, 386 (+5th nibble of limit) */
};
UINTN sizeof_init_gdt = sizeof init_gdt;
/*
* Highest available base memory address.
*
* For traditional kernels and loaders this is always at 0x90000.
* For updated kernels and loaders this is computed by taking the
* highest available base memory address and rounding down to the
* nearest 64 kB boundary and then subtracting 64 kB.
*
* A non-compressed kernel is automatically assumed to be an updated
* kernel. A compressed kernel that has bit 6 (0x40) set in the
* loader_flags field is also assumed to be an updated kernel.
*/
UINTN high_base_mem = 0x90000;
/*
* Highest available extended memory address.
*
* This is computed by taking the highest available extended memory
* address and rounding down to the nearest EFI_PAGE_SIZE (usually
* 4 kB) boundary.
* This is only used for backward compatibility.
*/
UINTN high_ext_mem = 32 * 1024 * 1024;
/* This starting address will hold true for all of the loader types for now */
VOID *kernel_start = (VOID *)0x100000; /* 1M */
VOID *initrd_start = NULL;
UINTN initrd_size = 0;
INTN
sysdeps_init(EFI_HANDLE dev)
{
DBG_PRT((L"sysdeps_init()\n"));
/*
* Register our loader(s)...
*/
loader_register(&bzimage_loader);
loader_register(&plain_loader);
loader_register(&gzip_loader);
return 0;
}
/*
* initrd_get_addr()
* Compute a starting address for the initial RAMdisk image.
* For now, this image is placed immediately after the end of
* the kernel memory. Inside the start_kernel() code, the
* RAMdisk image will be relocated to the top of available
* extended memory.
*/
INTN
sysdeps_initrd_get_addr(kdesc_t *kd, memdesc_t *imem)
{
DBG_PRT((L"initrd_get_addr()\n"));
if (!kd || !imem) {
ERR_PRT((L"kd=0x%x imem=0x%x", kd, imem));
return -1;
}
VERB_PRT(3, Print(L"kstart=0x%x kentry=0x%x kend=0x%x\n",
kd->kstart, kd->kentry, kd->kend));
imem->start_addr = kd->kend;
VERB_PRT(3, Print(L"initrd start_addr=0x%x pgcnt=%d\n",
imem->start_addr, imem->pgcnt));
return 0;
}
VOID
sysdeps_free_boot_params(boot_params_t *bp)
{
mmap_desc_t md;
ZeroMem(&md, sizeof md);
md.md = (VOID *)bp->s.efi_mem_map;
free_memmap(&md);
}
/*
* IA-32 specific boot parameters initialization routine
*/
INTN
sysdeps_create_boot_params(
boot_params_t *bp,
CHAR8 *cmdline,
memdesc_t *initrd,
memdesc_t *vmcode, /* no use for ia32 now*/
UINTN *cookie)
{
mmap_desc_t mdesc;
EFI_STATUS efi_status;
UINTN rows, cols;
UINT8 row, col;
UINT8 mode;
UINT16 hdr_version;
DBG_PRT((L"fill_boot_params()\n"));
if (!bp || !cmdline || !initrd || !cookie) {
ERR_PRT((L"bp=0x%x cmdline=0x%x initrd=0x%x cookie=0x%x",
bp, cmdline, initrd, cookie));
if (param_start != NULL) {
free(param_start);
param_start = NULL;
param_size = 0;
}
free_kmem();
return -1;
}
/*
* Copy temporary boot sector and setup data storage to
* elilo allocated boot parameter storage. We only need
* the first two sectors (1K). The rest of the storage
* can be used by the command line.
*/
if (param_start != NULL) {
CopyMem(bp, param_start, 0x2000);
free(param_start);
param_start = NULL;
param_size = 0;
}
/*
* Save off our header revision information.
*/
hdr_version = (bp->s.hdr_major << 8) | bp->s.hdr_minor;
/*
* Clear out unused memory in boot sector image.
*/
bp->s.unused_1 = 0;
bp->s.unused_2 = 0;
ZeroMem(bp->s.unused_3, sizeof bp->s.unused_3);
ZeroMem(bp->s.unused_4, sizeof bp->s.unused_4);
ZeroMem(bp->s.unused_5, sizeof bp->s.unused_5);
bp->s.unused_6 = 0;
bp->s.unused_7 = 0;
/*
* Tell kernel this was loaded by an advanced loader type.
* If this field is zero, the initrd_start and initrd_size
* fields are ignored by the kernel.
*/
bp->s.loader_type = LDRTYPE_ELILO;
/*
* Setup command line information.
*/
bp->s.cmdline_magik = CMDLINE_MAGIK;
bp->s.cmdline_offset = (UINT8 *)cmdline - (UINT8 *)bp;
/*
* Clear out the cmdline_addr field so the kernel can find
* the cmdline.
*/
bp->s.cmdline_addr = 0x0;
/*
* Setup hard drive parameters.
* %%TBD - It should be okay to zero fill the hard drive
* info buffers. The kernel should do its own detection.
*/
ZeroMem(bp->s.hd0_info, sizeof bp->s.hd0_info);
ZeroMem(bp->s.hd1_info, sizeof bp->s.hd1_info);
/*
* Memory info.
*/
bp->s.alt_mem_k = high_ext_mem / 1024;
if (bp->s.alt_mem_k <= 65535)
bp->s.ext_mem_k = (UINT16)bp->s.alt_mem_k;
else
bp->s.ext_mem_k = 65535;
/*
* Initial RAMdisk and root device stuff.
*/
DBG_PRT((L"initrd->start_addr=0x%x initrd->pgcnt=%d\n",
initrd->start_addr, initrd->pgcnt));
/* These RAMdisk flags are not needed, just zero them. */
bp->s.ramdisk_flags = 0;
if (initrd->start_addr && initrd->pgcnt) {
/* %%TBD - This will probably have to be changed. */
bp->s.initrd_start = (UINT32)initrd->start_addr;
bp->s.initrd_size = (UINT32)(initrd->size);
/*
* This is the RAMdisk root device for RedHat 2.2.x
* kernels (major 0x01, minor 0x00).
*/
bp->s.orig_root_dev = 0x0100;
} else {
bp->s.initrd_start = 0;
bp->s.initrd_size = 0;
}
/*
* APM BIOS info.
*/
bp->s.apm_bios_ver = NO_APM_BIOS;
bp->s.bios_code_seg = 0;
bp->s.bios_entry_point = 0;
bp->s.bios_code_seg16 = 0;
bp->s.bios_data_seg = 0;
bp->s.apm_bios_flags = 0;
bp->s.bios_code_len = 0;
bp->s.bios_data_len = 0;
/*
* MCA BIOS info (misnomer).
*/
bp->s.mca_info_len = 0;
ZeroMem(bp->s.mca_info_buf, sizeof bp->s.mca_info_buf);
/*
* Pointing device presence. The kernel will detect this.
*/
bp->s.aux_dev_info = NO_MOUSE;
/*
* EFI loader signature
*/
CopyMem(bp->s.efi_loader_sig, EFI_LOADER_SIG, 4);
/*
* Kernel entry point.
*/
bp->s.kernel_start = (UINT32)kernel_start;
/*
* When changing stuff in the parameter structure compare
* the offsets of the fields with the offsets used in the
* boot sector and setup source files.
* arch/i386/boot/bootsect.S
* arch/i386/boot/setup.S
* arch/i386/kernel/setup.c
* include/asm-i386/setup.h (2.5/2.6)
*/
#define CHECK_OFFSET(n, o, f) \
{ \
UINTN p = (UINT8 *)&bp->s.n - (UINT8 *)bp; \
UINTN q = (UINTN)(o); \
if (p != q) { \
test |= 1; \
Print(L"%20a: %3xh %3xh ", #n, p, q); \
if (*f) { \
Print(f, bp->s.n); \
} \
Print(L"\n"); \
} \
}
#define WAIT_FOR_KEY() \
{ \
EFI_INPUT_KEY key; \
while (ST->ConIn->ReadKeyStroke(ST->ConIn, &key) != EFI_SUCCESS) { \
; \
} \
}
{
UINTN test = 0;
CHECK_OFFSET(orig_cursor_col, 0x00, L"%xh");
CHECK_OFFSET(orig_cursor_row, 0x01, L"%xh");
CHECK_OFFSET(ext_mem_k, 0x02, L"%xh");
CHECK_OFFSET(orig_video_page, 0x04, L"%xh");
CHECK_OFFSET(orig_video_mode, 0x06, L"%xh");
CHECK_OFFSET(orig_video_cols, 0x07, L"%xh");
CHECK_OFFSET(orig_ega_bx, 0x0A, L"%xh");
CHECK_OFFSET(orig_video_rows, 0x0E, L"%xh");
CHECK_OFFSET(is_vga, 0x0F, L"%xh");
CHECK_OFFSET(orig_video_points, 0x10, L"%xh");
CHECK_OFFSET(lfb_width, 0x12, L"%xh");
CHECK_OFFSET(lfb_height, 0x14, L"%xh");
CHECK_OFFSET(lfb_depth, 0x16, L"%xh");
CHECK_OFFSET(lfb_base, 0x18, L"%xh");
CHECK_OFFSET(lfb_size, 0x1C, L"%xh");
CHECK_OFFSET(cmdline_magik, 0x20, L"%xh");
CHECK_OFFSET(cmdline_offset, 0x22, L"%xh");
CHECK_OFFSET(lfb_line_len, 0x24, L"%xh");
CHECK_OFFSET(lfb_red_size, 0x26, L"%xh");
CHECK_OFFSET(lfb_red_pos, 0x27, L"%xh");
CHECK_OFFSET(lfb_green_size, 0x28, L"%xh");
CHECK_OFFSET(lfb_green_pos, 0x29, L"%xh");
CHECK_OFFSET(lfb_blue_size, 0x2A, L"%xh");
CHECK_OFFSET(lfb_blue_pos, 0x2B, L"%xh");
CHECK_OFFSET(lfb_rsvd_size, 0x2C, L"%xh");
CHECK_OFFSET(lfb_rsvd_pos, 0x2D, L"%xh");
CHECK_OFFSET(vesa_seg, 0x2E, L"%xh");
CHECK_OFFSET(vesa_off, 0x30, L"%xh");
CHECK_OFFSET(lfb_pages, 0x32, L"%xh");
CHECK_OFFSET(lfb_reserved, 0x34, L"");
CHECK_OFFSET(apm_bios_ver, 0x40, L"%xh");
CHECK_OFFSET(bios_code_seg, 0x42, L"%xh");
CHECK_OFFSET(bios_entry_point, 0x44, L"%xh");
CHECK_OFFSET(bios_code_seg16, 0x48, L"%xh");
CHECK_OFFSET(bios_data_seg, 0x4A, L"%xh");
CHECK_OFFSET(apm_bios_flags, 0x4C, L"%xh");
CHECK_OFFSET(bios_code_len, 0x4E, L"%xh");
CHECK_OFFSET(bios_data_len, 0x52, L"%xh");
CHECK_OFFSET(hd0_info, 0x80, L"");
CHECK_OFFSET(hd1_info, 0x90, L"");
CHECK_OFFSET(mca_info_len, 0xA0, L"%xh");
CHECK_OFFSET(mca_info_buf, 0xA2, L"");
CHECK_OFFSET(efi_loader_sig, 0x1C0, L"'%-4.4a'");
CHECK_OFFSET(efi_sys_tbl, 0x1C4, L"%xh");
CHECK_OFFSET(efi_mem_desc_size, 0x1C8, L"%xh");
CHECK_OFFSET(efi_mem_desc_ver, 0x1CC, L"%xh");
CHECK_OFFSET(efi_mem_map, 0x1D0, L"%xh");
CHECK_OFFSET(efi_mem_map_size, 0x1D4, L"%xh");
CHECK_OFFSET(loader_start, 0x1D8, L"%xh");
CHECK_OFFSET(loader_size, 0x1DC, L"%xh");
CHECK_OFFSET(alt_mem_k, 0x1E0, L"%xh");
CHECK_OFFSET(setup_sectors, 0x1F1, L"%xh");
CHECK_OFFSET(mount_root_rdonly, 0x1F2, L"%xh");
CHECK_OFFSET(sys_size, 0x1F4, L"%xh");
CHECK_OFFSET(swap_dev, 0x1F6, L"%xh");
CHECK_OFFSET(ramdisk_flags, 0x1F8, L"%xh");
CHECK_OFFSET(video_mode_flag, 0x1FA, L"%xh");
CHECK_OFFSET(orig_root_dev, 0x1FC, L"%xh");
CHECK_OFFSET(aux_dev_info, 0x1FF, L"%xh");
CHECK_OFFSET(jump, 0x200, L"%xh");
CHECK_OFFSET(setup_sig, 0x202, L"'%-4.4a'");
CHECK_OFFSET(hdr_minor, 0x206, L"%xh");
CHECK_OFFSET(hdr_major, 0x207, L"%xh");
CHECK_OFFSET(rm_switch, 0x208, L"%xh");
CHECK_OFFSET(start_sys_seg, 0x20C, L"%xh");
CHECK_OFFSET(kernel_verstr_offset, 0x20E, L"%xh");
CHECK_OFFSET(loader_type, 0x210, L"%xh");
CHECK_OFFSET(loader_flags, 0x211, L"%xh");
CHECK_OFFSET(setup_move_size, 0x212, L"%xh");
CHECK_OFFSET(kernel_start, 0x214, L"%xh");
CHECK_OFFSET(initrd_start, 0x218, L"%xh");
CHECK_OFFSET(initrd_size, 0x21C, L"%xh");
CHECK_OFFSET(bootsect_helper, 0x220, L"%xh");
CHECK_OFFSET(heap_end_ptr, 0x224, L"%xh");
CHECK_OFFSET(cmdline_addr, 0x228, L"%xh");
if (test) {
ERR_PRT((L"Boot sector and/or setup parameter alignment error."));
free_kmem();
return -1;
}
}
/*
* Get video information.
* Do this last so that any other cursor positioning done
* in the fill routine gets accounted for.
*/
efi_status = ST->ConOut->QueryMode(
ST->ConOut,
ST->ConOut->Mode->Mode,
&cols,
&rows);
if (EFI_ERROR(efi_status)) {
ERR_PRT((L"QueryMode failed. Fake it."));
mode = 3;
rows = 25;
cols = 80;
row = 24;
col = 0;
} else {
mode = (UINT8)ST->ConOut->Mode->Mode;
col = (UINT8)ST->ConOut->Mode->CursorColumn;
row = (UINT8)ST->ConOut->Mode->CursorRow;
}
bp->s.orig_cursor_col = col;
bp->s.orig_cursor_row = row;
bp->s.orig_video_page = 0;
bp->s.orig_video_mode = mode;
bp->s.orig_video_cols = (UINT8)cols;
bp->s.orig_video_rows = (UINT8)rows;
bp->s.orig_ega_bx = 0;
bp->s.is_vga = 0;
bp->s.orig_video_points = 16;
bp->s.lfb_width = 0;
bp->s.lfb_height = 0;
bp->s.lfb_depth = 0;
bp->s.lfb_base = 0;
bp->s.lfb_size = 0;
bp->s.lfb_line_len = 0;
bp->s.lfb_red_size = 0;
bp->s.lfb_red_pos = 0;
bp->s.lfb_green_size = 0;
bp->s.lfb_green_pos = 0;
bp->s.lfb_blue_size = 0;
bp->s.lfb_blue_pos = 0;
bp->s.lfb_rsvd_size = 0;
bp->s.lfb_rsvd_pos = 0;
bp->s.lfb_pages = 0;
bp->s.vesa_seg = 0;
bp->s.vesa_off = 0;
/*
* Get memory map description and cookie for ExitBootServices()
*/
if (get_memmap(&mdesc)) {
ERR_PRT((L"Could not get memory map."));
free_kmem();
return -1;
}
*cookie = mdesc.cookie;
bp->s.efi_mem_map = (UINTN)mdesc.md;
bp->s.efi_mem_map_size = mdesc.map_size;
bp->s.efi_mem_desc_size = mdesc.desc_size;
bp->s.efi_mem_desc_ver = mdesc.desc_version;
bp->s.efi_sys_tbl = (UINTN)systab;
return 0;
}
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