2 * Copyright (C) 2001-2003 Hewlett-Packard Co.
3 * Contributed by Stephane Eranian <eranian@hpl.hp.com>
4 * Contributed by Mike Johnston <johnston@intel.com>
5 * Contributed by Chris Ahna <christopher.j.ahna@intel.com>
7 * This file is part of the ELILO, the EFI Linux boot loader.
9 * ELILO is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * ELILO is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with ELILO; see the file COPYING. If not, write to the Free
21 * Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 * Please check out the elilo.txt for complete documentation on how
25 * to use this program.
29 * This file is used to define all the IA32-specific data structures
30 * and constant used by the generic ELILO
32 #ifndef __ELILO_SYSDEPS_IA32_H__
33 #define __ELILO_SYSDEPS_IA32_H__
35 #define ELILO_ARCH "IA-32" /* ASCII string */
36 #define PADDR_MASK 0xfffffff
38 /* for now use library versions */
39 #define Memset(a,v,n) SetMem((a),(n),(v))
40 #define Memcpy(a,b,n) CopyMem((a),(b),(n))
43 * This version must match the one in the kernel.
45 * This table was put together using information from the
46 * following Linux kernel source files:
48 * linux/arch/i386/kernel/setup.c
49 * linux/arch/i386/boot/bootsect.S
50 * linux/arch/i386/boot/setup.S
51 * linux/arch/i386/boot/video.S
53 * New fields in this structure for EFI and ELILO are:
57 * A new bit, LDRFLAG_BOOT_PARAM_RELOC, in the loader_flags
58 * field is also defined in this file.
63 /* Definitions for converting EFI memory map to E820 map for Linux
64 * These definitions are from include/linux/asm-x86/e820.h
65 * The structure ia32_boot_params below is updated to accommodate E820 map
66 * EFI memory map is converted to E820 map in this structure and passed
67 * to Linux. This way the OS does not need to do the conversion.
71 #define E820_RESERVED 2
77 UINT64 addr; /* start of memory segment */
78 UINT64 size; /* size of memory segment */
79 UINT32 type; /* type of memory segment */
80 } __attribute__((packed));
82 typedef union ia32_boot_params {
85 /* Cursor position before passing control to kernel. */
86 /* 0x00 */ UINT8 orig_cursor_col; /* LDR */
87 /* 0x01 */ UINT8 orig_cursor_row; /* LDR */
89 /* Available contiguous extended memory in KB. */
90 /* 0x02 */ UINT16 ext_mem_k; /* LDR */
92 /* Video page, mode and screen width before passing control to kernel. */
93 /* 0x04 */ UINT16 orig_video_page; /* LDR */
94 /* 0x06 */ UINT8 orig_video_mode; /* LDR */
95 /* 0x07 */ UINT8 orig_video_cols; /* LDR */
97 /* 0x08 */ UINT16 unused_1; /* unused */
100 /* 0x0A */ UINT16 orig_ega_bx; /* LDR */
102 /* 0x0C */ UINT16 unused_2; /* unused */
104 /* Screen height before passing control to kernel. */
105 /* 0x0E */ UINT8 orig_video_rows; /* LDR */
108 /* 0x0F */ UINT8 is_vga; /* LDR */
109 /* 0x10 */ UINT16 orig_video_points; /* LDR */
112 /* 0x12 */ UINT16 lfb_width; /* LDR */
113 /* 0x14 */ UINT16 lfb_height; /* LDR */
114 /* 0x16 */ UINT16 lfb_depth; /* LDR */
115 /* 0x18 */ UINT32 lfb_base; /* LDR */
116 /* 0x1C */ UINT32 lfb_size; /* LDR */
118 /* Offset of command line (from start of ia32_boot_param struct). */
119 /* The command line magik number must be set for the kernel setup */
120 /* code to use the command line offset. */
121 /* 0x20 */ UINT16 cmdline_magik; /* LDR */
122 #define CMDLINE_MAGIK 0xA33F
123 /* 0x22 */ UINT16 cmdline_offset; /* LDR */
126 /* 0x24 */ UINT16 lfb_line_len; /* LDR */
129 /* 0x26 */ UINT8 lfb_red_size; /* LDR */
130 /* 0x27 */ UINT8 lfb_red_pos; /* LDR */
131 /* 0x28 */ UINT8 lfb_green_size; /* LDR */
132 /* 0x29 */ UINT8 lfb_green_pos; /* LDR */
133 /* 0x2A */ UINT8 lfb_blue_size; /* LDR */
134 /* 0x2B */ UINT8 lfb_blue_pos; /* LDR */
135 /* 0x2C */ UINT8 lfb_rsvd_size; /* LDR */
136 /* 0x2D */ UINT8 lfb_rsvd_pos; /* LDR */
139 /* 0x2E */ UINT16 vesa_seg; /* LDR */
140 /* 0x30 */ UINT16 vesa_off; /* LDR */
143 /* 0x32 */ UINT16 lfb_pages; /* LDR */
144 /* 0x34 */ UINT8 lfb_reserved[0x0C]; /* reserved */
147 /* 0x40 */ UINT16 apm_bios_ver; /* LDR */
148 #define NO_APM_BIOS 0x0000
151 /* 0x42 */ UINT16 bios_code_seg; /* LDR */
152 /* 0x44 */ UINT32 bios_entry_point; /* LDR */
153 /* 0x48 */ UINT16 bios_code_seg16; /* LDR */
154 /* 0x4A */ UINT16 bios_data_seg; /* LDR */
157 /* 0x4C */ UINT16 apm_bios_flags; /* LDR */
158 #define NO_32BIT_APM_MASK 0xFFFD
161 /* 0x4E */ UINT32 bios_code_len; /* LDR */
162 /* 0x52 */ UINT16 bios_data_len; /* LDR */
164 /* 0x54 */ UINT8 unused_3[0x2C]; /* unused */
167 /* 0x80 */ UINT8 hd0_info[0x10]; /* LDR */
168 /* 0x90 */ UINT8 hd1_info[0x10]; /* LDR */
171 /* 0xA0 */ UINT16 mca_info_len; /* LDR */
172 /* 0xA2 */ UINT8 mca_info_buf[0x10]; /* LDR */
174 /* 0xB2 */ UINT8 unused_4[0x10E]; /* unused */
176 /* EFI boot loader signature. */
177 /* 0x1C0 */ UINT8 efi_loader_sig[4]; /* LDR */
178 #define EFI_LOADER_SIG_IA32 "EL32"
180 /* Address of the EFI system table. */
181 /* 0x1C4 */ UINT32 efi_sys_tbl; /* LDR */
183 /* EFI memory descriptor size. */
184 /* 0x1C8 */ UINT32 efi_mem_desc_size; /* LDR */
186 /* EFI memory descriptor version. */
187 /* 0x1CC */ UINT32 efi_mem_desc_ver; /* LDR */
189 /* Address & size of EFI memory map. */
190 /* 0x1D0 */ UINT32 efi_mem_map; /* LDR */
191 /* 0x1D4 */ UINT32 efi_mem_map_size; /* LDR */
193 /* Address & size of loader. */
194 /* 0x1D8 */ UINT32 loader_start; /* LDR */
195 /* 0x1DC */ UINT32 loader_size; /* LDR */
197 /* Available contiguous extended memory in KB. */
198 /* 0x1E0 */ UINT32 alt_mem_k; /* LDR */
200 /* 0x1E4 */ UINT32 unused_51; /* unused */
201 /* 0x1E8 */ UINT8 e820_nrmap;
202 /* 0x1E9 */ UINT32 unused_52[2]; /* unused */
204 /* Size of setup code in sectors (1 sector == 512 bytes). */
205 /* 0x1F1 */ UINT8 setup_sectors; /* BLD */
208 /* 0x1F2 */ UINT16 mount_root_rdonly; /* BLD */
211 /* 0x1F4 */ UINT16 sys_size; /* BLD */
214 /* 0x1F6 */ UINT16 swap_dev; /* BLD */
217 /* 0x1F8 */ UINT16 ramdisk_flags; /* BLD */
218 #define RAMDISK_PROMPT 0x8000
219 #define RAMDISK_LOAD 0x4000
222 /* 0x1FA */ UINT16 video_mode_flag; /* BLD */
225 /* 0x1FC */ UINT16 orig_root_dev; /* BLD */
227 /* 0x1FE */ UINT8 unused_6; /* unused */
230 /* 0x1FF */ UINT8 aux_dev_info; /* LDR */
231 #define NO_MOUSE 0x00
232 #define FOUND_MOUSE 0xAA
234 /* Jump past setup data (not used in EFI). */
235 /* 0x200 */ UINT16 jump; /* BLD */
237 /* Setup data signature. */
238 /* 0x202 */ UINT8 setup_sig[4]; /* BLD */
239 #define SETUP_SIG "HdrS"
242 /* 0x206 */ UINT8 hdr_minor; /* BLD */
243 /* 0x207 */ UINT8 hdr_major; /* BLD */
246 /* 0x208 */ UINT32 rm_switch; /* LDD */
249 /* 0x20C */ UINT16 start_sys_seg; /* BLD */
252 /* 0x20E */ UINT16 kernel_verstr_offset; /* BLD */
254 /* Loader type & version. */
255 /* 0x210 */ UINT8 loader_type; /* LDR */
256 #define LDRTYPE_ELILO 0x50 /* 5?h == elilo */
257 /* ?0h == revision */
259 /* 0x211 */ UINT8 loader_flags; /* BLD and LDR */
260 #define LDRFLAG_CAN_USE_HEAP 0x80
261 #define LDRFLAG_BOOT_PARAM_RELOC 0x40
264 /* 0x212 */ UINT16 setup_move_size; /* BLD */
267 /* 0x214 */ UINT32 kernel_start; /* LDR */
270 /* 0x218 */ UINT32 initrd_start; /* LDR */
271 /* 0x21C */ UINT32 initrd_size; /* LDR */
274 /* 0x220 */ UINT32 bootsect_helper; /* BLD */
277 /* 0x224 */ UINT16 heap_end_ptr; /* LDR */
280 /* 0x226 */ UINT16 unused_7; /* LDR */
282 /* 0x228 */ UINT32 cmdline_addr; /* LDR */
283 /* 0x22C */ UINT32 unused_8[41];
284 /* 0x2D0 */ UINT8 e820_map[2560];
290 * The stuff below here is for jumping to the kernel.
294 * Some macros to copy and set memory after EFI has been
298 #define MEMCPY(to, from, cnt) { \
299 UINT8 *t = (UINT8 *)(to); \
300 UINT8 *f = (UINT8 *)(from); \
309 #define MEMSET(ptr, size, val) { \
310 UINT8 *p = (UINT8 *)(ptr); \
311 UINTN n = (UINTN)(size); \
312 UINT8 v = (UINT8)(val); \
321 * Descriptor table pointer format.
330 extern UINTN high_base_mem;
331 extern UINTN high_ext_mem;
333 extern boot_params_t *param_start;
334 extern UINTN param_size;
336 extern VOID *kernel_start;
337 extern UINTN kernel_size;
339 extern VOID *initrd_start;
340 extern UINTN initrd_size;
342 extern dt_addr_t gdt_addr;
343 extern dt_addr_t idt_addr;
345 extern UINT16 init_gdt[];
346 extern UINTN sizeof_init_gdt;
348 extern UINT8 rmswitch_image[];
349 extern UINTN rmswitch_size;
351 extern INTN ia32_use_legacy_free_boot();
354 * How to jump to kernel code
358 start_kernel(VOID *kentry, boot_params_t *bp)
361 * Disable interrupts.
363 asm volatile ( "cli" : : );
366 * Relocate initrd, if present.
369 if (bp->s.initrd_start) {
370 MEMCPY(15 * 1024 * 1024, bp->s.initrd_start, bp->s.initrd_size);
371 bp->s.initrd_start = 15 * 1024 * 1024;
374 * Copy boot sector, setup data and command line
375 * to final resting place. We need to copy
376 * BOOT_PARAM_MEMSIZE bytes.
379 MEMCPY(high_base_mem, bp, 0x4000);
381 bp = (boot_params_t *)high_base_mem;
382 bp->s.cmdline_addr = high_base_mem + bp->s.cmdline_offset;
385 * Initialize Linux GDT.
388 MEMSET(gdt_addr.base, gdt_addr.limit, 0);
389 MEMCPY(gdt_addr.base, init_gdt, sizeof_init_gdt);
391 if (! ia32_use_legacy_free_boot()) {
394 * Copy our real mode transition code to 0x7C00.
397 MEMCPY(0x7C00, rmswitch_image, rmswitch_size);
399 asm volatile ( "movl $0x7C00, %%ebx" : : );
400 asm volatile ( "jmp *%%ebx" : : );
404 * Load descriptor table pointers.
407 asm volatile ( "lidt %0" : : "m" (idt_addr) );
408 asm volatile ( "lgdt %0" : : "m" (gdt_addr) );
411 * ebx := 0 (%%TBD - do not know why, yet)
412 * ecx := kernel entry point
413 * esi := address of boot sector and setup data
416 asm volatile ( "movl %0, %%esi" : : "m" (high_base_mem) );
417 asm volatile ( "movl %0, %%ecx" : : "m" (kentry) );
418 asm volatile ( "xorl %%ebx, %%ebx" : : );
421 * Jump to kernel entry point.
424 asm volatile ( "jmp *%%ecx" : : );
427 typedef struct sys_img_options {
431 #endif /* __ELILO_SYSDEPS_IA32_H__ */