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elilo/ia32/sysdeps.h

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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 is used to define all the IA32-specific data structures
* and constant used by the generic ELILO
*/
#ifndef __ELILO_SYSDEPS_IA32_H__
#define __ELILO_SYSDEPS_IA32_H__
#define ELILO_ARCH "IA-32" /* ASCII string */
/* for now use library versions */
#define Memset(a,v,n) SetMem((a),(n),(v))
#define Memcpy(a,b,n) CopyMem((a),(b),(n))
/*
* This version must match the one in the kernel.
*
* This table was put together using information from the
* following Linux kernel source files:
* linux/include/tty.h
* linux/arch/i386/kernel/setup.c
* linux/arch/i386/boot/bootsect.S
* linux/arch/i386/boot/setup.S
* linux/arch/i386/boot/video.S
*
* New fields in this structure for EFI and ELILO are:
* efi_loader_sig
* efi_st_addr
*
* A new bit, LDRFLAG_BOOT_PARAM_RELOC, in the loader_flags
* field is also defined in this file.
*/
typedef struct efi_ia32_boot_params {
UINT32 size;
UINT32 command_line;
UINT32 efi_sys_tbl;
UINT32 efi_mem_map;
UINT32 efi_mem_map_size;
UINT32 efi_mem_desc_size;
UINT32 efi_mem_desc_version;
UINT32 initrd_start;
UINT32 initrd_size;
UINT32 loader_start;
UINT32 loader_size;
UINT32 kernel_start;
UINT32 kernel_size;
UINT16 num_cols;
UINT16 num_rows;
UINT16 orig_x;
UINT16 orig_y;
} efi_ia32_boot_params_t;
extern efi_ia32_boot_params_t efi_ia32_bp;
#pragma pack(1)
typedef union ia32_boot_params {
UINT8 raw[0x2000];
struct {
/* Cursor position before passing control to kernel. */
/* 0x00 */ UINT8 orig_cursor_col; /* LDR */
/* 0x01 */ UINT8 orig_cursor_row; /* LDR */
/* Available contiguous extended memory in KB. */
/* 0x02 */ UINT16 ext_mem_k; /* LDR */
/* Video page, mode and screen width before passing control to kernel. */
/* 0x04 */ UINT16 orig_video_page; /* LDR */
/* 0x06 */ UINT8 orig_video_mode; /* LDR */
/* 0x07 */ UINT8 orig_video_cols; /* LDR */
/* 0x08 */ UINT16 unused_1; /* unused */
/* %%TBD */
/* 0x0A */ UINT16 orig_ega_bx; /* LDR */
/* 0x0C */ UINT16 unused_2; /* unused */
/* Screen height before passing control to kernel. */
/* 0x0E */ UINT8 orig_video_rows; /* LDR */
/* %%TBD */
/* 0x0F */ UINT8 is_vga; /* LDR */
/* 0x10 */ UINT16 orig_video_points; /* LDR */
/* %%TBD */
/* 0x12 */ UINT16 lfb_width; /* LDR */
/* 0x14 */ UINT16 lfb_height; /* LDR */
/* 0x16 */ UINT16 lfb_depth; /* LDR */
/* 0x18 */ UINT32 lfb_base; /* LDR */
/* 0x1C */ UINT32 lfb_size; /* LDR */
/* Offset of command line (from start of ia32_boot_param struct). */
/* The command line magik number must be set for the kernel setup */
/* code to use the command line offset. */
/* 0x20 */ UINT16 cmdline_magik; /* LDR */
#define CMDLINE_MAGIK 0xA33F
/* 0x22 */ UINT16 cmdline_offset; /* LDR */
/* %%TBD */
/* 0x24 */ UINT16 lfb_line_len; /* LDR */
/* %%TBD */
/* 0x26 */ UINT8 lfb_red_size; /* LDR */
/* 0x27 */ UINT8 lfb_red_pos; /* LDR */
/* 0x28 */ UINT8 lfb_green_size; /* LDR */
/* 0x29 */ UINT8 lfb_green_pos; /* LDR */
/* 0x2A */ UINT8 lfb_blue_size; /* LDR */
/* 0x2B */ UINT8 lfb_blue_pos; /* LDR */
/* 0x2C */ UINT8 lfb_rsvd_size; /* LDR */
/* 0x2D */ UINT8 lfb_rsvd_pos; /* LDR */
/* %%TBD */
/* 0x2E */ UINT16 vesa_seg; /* LDR */
/* 0x30 */ UINT16 vesa_off; /* LDR */
/* %%TBD */
/* 0x32 */ UINT16 lfb_pages; /* LDR */
/* 0x34 */ UINT8 lfb_reserved[0x0C]; /* reserved */
/* %%TBD */
/* 0x40 */ UINT16 apm_bios_ver; /* LDR */
#define NO_APM_BIOS 0x0000
/* %%TBD */
/* 0x42 */ UINT16 bios_code_seg; /* LDR */
/* 0x44 */ UINT32 bios_entry_point; /* LDR */
/* 0x48 */ UINT16 bios_code_seg16; /* LDR */
/* 0x4A */ UINT16 bios_data_seg; /* LDR */
/* %%TBD */
/* 0x4C */ UINT16 apm_bios_flags; /* LDR */
#define NO_32BIT_APM_MASK 0xFFFD
/* %%TBD */
/* 0x4E */ UINT32 bios_code_len; /* LDR */
/* 0x52 */ UINT16 bios_data_len; /* LDR */
/* 0x54 */ UINT8 unused_3[0x2C]; /* unused */
/* %%TBD */
/* 0x80 */ UINT8 hd0_info[0x10]; /* LDR */
/* 0x90 */ UINT8 hd1_info[0x10]; /* LDR */
/* %%TBD */
/* 0xA0 */ UINT16 mca_info_len; /* LDR */
/* 0xA2 */ UINT8 mca_info_buf[0x10]; /* LDR */
/* 0xB2 */ UINT8 unused_4[0x10E]; /* unused */
/* EFI boot loader signature. */
/* 0x1C0 */ UINT8 efi_loader_sig[4]; /* LDR */
#define EFI_LOADER_SIG "EFIL"
/* Address of the EFI system table. */
/* 0x1C4 */ UINT32 efi_sys_tbl; /* LDR */
/* EFI memory descriptor size. */
/* 0x1C8 */ UINT32 efi_mem_desc_size; /* LDR */
/* EFI memory descriptor version. */
/* 0x1CC */ UINT32 efi_mem_desc_ver; /* LDR */
/* Address & size of EFI memory map. */
/* 0x1D0 */ UINT32 efi_mem_map; /* LDR */
/* 0x1D4 */ UINT32 efi_mem_map_size; /* LDR */
/* Address & size of loader. */
/* 0x1D8 */ UINT32 loader_start; /* LDR */
/* 0x1DC */ UINT32 loader_size; /* LDR */
/* Available contiguous extended memory in KB. */
/* 0x1E0 */ UINT32 alt_mem_k; /* LDR */
/* 0x1E4 */ UINT8 unused_5[0x0D]; /* unused */
/* Size of setup code in sectors (1 sector == 512 bytes). */
/* 0x1F1 */ UINT8 setup_sectors; /* BLD */
/* %%TBD */
/* 0x1F2 */ UINT16 mount_root_rdonly; /* BLD */
/* %%TBD */
/* 0x1F4 */ UINT16 sys_size; /* BLD */
/* %%TBD */
/* 0x1F6 */ UINT16 swap_dev; /* BLD */
/* %%TBD */
/* 0x1F8 */ UINT16 ramdisk_flags; /* BLD */
#define RAMDISK_PROMPT 0x8000
#define RAMDISK_LOAD 0x4000
/* %%TBD */
/* 0x1FA */ UINT16 video_mode_flag; /* BLD */
/* %%TBD */
/* 0x1FC */ UINT16 orig_root_dev; /* BLD */
/* 0x1FE */ UINT8 unused_6; /* unused */
/* %%TBD */
/* 0x1FF */ UINT8 aux_dev_info; /* LDR */
#define NO_MOUSE 0x00
#define FOUND_MOUSE 0xAA
/* Jump past setup data (not used in EFI). */
/* 0x200 */ UINT16 jump; /* BLD */
/* Setup data signature. */
/* 0x202 */ UINT8 setup_sig[4]; /* BLD */
#define SETUP_SIG "HdrS"
/* %%TBD */
/* 0x206 */ UINT8 hdr_minor; /* BLD */
/* 0x207 */ UINT8 hdr_major; /* BLD */
/* %%TBD */
/* 0x208 */ UINT32 rm_switch; /* LDD */
/* %%TBD */
/* 0x20C */ UINT16 start_sys_seg; /* BLD */
/* %%TBD */
/* 0x20E */ UINT16 kernel_verstr_offset; /* BLD */
/* Loader type & version. */
/* 0x210 */ UINT8 loader_type; /* LDR */
#define LDRTYPE_ELILO 0x50 /* 5?h == elilo */
/* ?0h == revision */
/* 0x211 */ UINT8 loader_flags; /* BLD and LDR */
#define LDRFLAG_CAN_USE_HEAP 0x80
#define LDRFLAG_BOOT_PARAM_RELOC 0x40
/* %%TBD */
/* 0x212 */ UINT16 setup_move_size; /* BLD */
/* %%TBD */
/* 0x214 */ UINT32 kernel_start; /* LDR */
/* %%TBD */
/* 0x218 */ UINT32 initrd_start; /* LDR */
/* 0x21C */ UINT32 initrd_size; /* LDR */
/* %%TBD */
/* 0x220 */ UINT32 bootsect_helper; /* BLD */
/* %%TBD */
/* 0x224 */ UINT16 heap_end_ptr; /* LDR */
/* %%TBD */
/* 0x226 */ UINT32 base_mem_size; /* LDR */
} s;
} boot_params_t;
#pragma pack()
/*
* The stuff below here is for jumping to the kernel.
*/
/*
* Some macros to copy and set memory after EFI has been
* stopped.
*/
#define MEMCPY(to, from, cnt) { \
UINT8 *t = (UINT8 *)(to); \
UINT8 *f = (UINT8 *)(from); \
UINTN n = cnt; \
if (t && f && n) { \
while (n--) { \
*t++ = *f++; \
} \
} \
}
#define MEMSET(ptr, size, val) { \
UINT8 *p = (UINT8 *)(ptr); \
UINTN n = (UINTN)(size); \
UINT8 v = (UINT8)(val); \
if (p && n) { \
while (n--) { \
*p++ = v; \
} \
} \
}
/*
* Descriptor table pointer format.
*/
#pragma pack(1)
typedef struct {
UINT16 limit;
UINT32 base;
} dt_addr_t;
#pragma pack()
extern UINTN high_base_mem;
extern UINTN high_ext_mem;
extern boot_params_t *param_start;
extern UINTN param_size;
extern VOID *kernel_start;
extern UINTN kernel_size;
extern VOID *initrd_start;
extern UINTN initrd_size;
extern dt_addr_t gdt_addr;
extern dt_addr_t idt_addr;
extern UINT16 init_gdt[];
extern UINTN sizeof_init_gdt;
extern UINT8 rmswitch_image[];
extern UINTN rmswitch_size;
extern INTN ia32_use_legacy_free_boot();
/*
* How to jump to kernel code
*/
static inline void
start_kernel(VOID *kentry, boot_params_t *bp)
{
/*
* Disable interrupts.
*/
asm volatile ( "cli" : : );
/*
* Relocate initrd, if present.
*/
if (bp->s.initrd_start) {
/* %%TBD */
MEMCPY(15 * 1024 * 1024, bp->s.initrd_start, bp->s.initrd_size);
bp->s.initrd_start = 15 * 1024 * 1024;
}
/*
* Copy boot sector, setup data and command line
* to final resting place. We need to copy
* BOOT_PARAM_MEMSIZE bytes.
*/
MEMCPY(high_base_mem, bp, 0x4000);
/*
* initialize efi ia32 boot params and place them at 1kb up from
* the start of the boot command line param. This results in the
* efi ia32 boot params to be copied to 0x00104c00. See bootparams.c
* for details on how this is arranged. EFI enabled
* kernels will look for the efi boot params here to know if the
* kernel is booting on an EFI platform or legacy BIOS based platfrom
*/
efi_ia32_bp.initrd_start = bp->s.initrd_start;
efi_ia32_bp.initrd_size = bp->s.initrd_size;
MEMCPY(high_base_mem + 0x4000 - 0x0400, &efi_ia32_bp, sizeof(efi_ia32_bp));
/*
* Initialize Linux GDT.
*/
MEMSET(gdt_addr.base, gdt_addr.limit, 0);
MEMCPY(gdt_addr.base, init_gdt, sizeof_init_gdt);
if (! ia32_use_legacy_free_boot()) {
/*
* Copy our real mode transition code to 0x7C00.
*/
MEMCPY(0x7C00, rmswitch_image, rmswitch_size);
asm volatile ( "movl $0x7C00, %%ebx" : : );
asm volatile ( "jmp *%%ebx" : : );
}
/*
* Load descriptor table pointers.
*/
asm volatile ( "lidt %0" : : "m" (idt_addr) );
asm volatile ( "lgdt %0" : : "m" (gdt_addr) );
/*
* ebx := 0 (%%TBD - do not know why, yet)
* ecx := kernel entry point
* esi := address of boot sector and setup data
*/
asm volatile ( "movl %0, %%esi" : : "m" (high_base_mem) );
asm volatile ( "movl %0, %%ecx" : : "m" (kentry) );
asm volatile ( "xorl %%ebx, %%ebx" : : );
/*
* Jump to kernel entry point.
*/
asm volatile ( "jmp *%%ecx" : : );
}
typedef struct sys_img_options {
UINT8 nothing_yet;
} sys_img_options_t;
#endif /* __ELILO_SYSDEPS_IA32_H__ */
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