/* * Copyright (C) 2001-2003 Hewlett-Packard Co. * Contributed by Stephane Eranian * Contributed by Mike Johnston * Contributed by Chris Ahna * * 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 */ #define PADDR_MASK 0xfffffff /* 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. */ #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 */ UINT16 unused_7; /* LDR */ /* 0x228 */ UINT32 cmdline_addr; /* 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) { 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 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__ */