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 #define INITRD_START (15*1024*1024)
39 #define DEFAULT_KERNEL_START 0x100000
41 /* for now use library versions */
42 #define Memset(a,v,n) SetMem((a),(n),(v))
43 #define Memcpy(a,b,n) CopyMem((a),(b),(n))
46 * This version must match the one in the kernel.
48 * This table was put together using information from the
49 * following Linux kernel source files:
51 * linux/arch/i386/kernel/setup.c
52 * linux/arch/i386/boot/bootsect.S
53 * linux/arch/i386/boot/setup.S
54 * linux/arch/i386/boot/video.S
56 * New fields in this structure for EFI and ELILO are:
60 * A new bit, LDRFLAG_BOOT_PARAM_RELOC, in the loader_flags
61 * field is also defined in this file.
66 /* Definitions for converting EFI memory map to E820 map for Linux
67 * These definitions are from include/linux/asm-x86/e820.h
68 * The structure ia32_boot_params below is updated to accommodate E820 map
69 * EFI memory map is converted to E820 map in this structure and passed
70 * to Linux. This way the OS does not need to do the conversion.
74 #define E820_RESERVED 2
80 UINT64 addr; /* start of memory segment */
81 UINT64 size; /* size of memory segment */
82 UINT32 type; /* type of memory segment */
83 } __attribute__((packed));
85 typedef union ia32_boot_params {
88 /* Cursor position before passing control to kernel. */
89 /* 0x00 */ UINT8 orig_cursor_col; /* LDR */
90 /* 0x01 */ UINT8 orig_cursor_row; /* LDR */
92 /* Available contiguous extended memory in KB. */
93 /* 0x02 */ UINT16 ext_mem_k; /* LDR */
95 /* Video page, mode and screen width before passing control to kernel. */
96 /* 0x04 */ UINT16 orig_video_page; /* LDR */
97 /* 0x06 */ UINT8 orig_video_mode; /* LDR */
98 /* 0x07 */ UINT8 orig_video_cols; /* LDR */
100 /* 0x08 */ UINT16 unused_1; /* unused */
103 /* 0x0A */ UINT16 orig_ega_bx; /* LDR */
105 /* 0x0C */ UINT16 unused_2; /* unused */
107 /* Screen height before passing control to kernel. */
108 /* 0x0E */ UINT8 orig_video_rows; /* LDR */
111 /* 0x0F */ UINT8 is_vga; /* LDR */
112 /* 0x10 */ UINT16 orig_video_points; /* LDR */
115 /* 0x12 */ UINT16 lfb_width; /* LDR */
116 /* 0x14 */ UINT16 lfb_height; /* LDR */
117 /* 0x16 */ UINT16 lfb_depth; /* LDR */
118 /* 0x18 */ UINT32 lfb_base; /* LDR */
119 /* 0x1C */ UINT32 lfb_size; /* LDR */
121 /* Offset of command line (from start of ia32_boot_param struct). */
122 /* The command line magik number must be set for the kernel setup */
123 /* code to use the command line offset. */
124 /* 0x20 */ UINT16 cmdline_magik; /* LDR */
125 #define CMDLINE_MAGIK 0xA33F
126 /* 0x22 */ UINT16 cmdline_offset; /* LDR */
129 /* 0x24 */ UINT16 lfb_line_len; /* LDR */
132 /* 0x26 */ UINT8 lfb_red_size; /* LDR */
133 /* 0x27 */ UINT8 lfb_red_pos; /* LDR */
134 /* 0x28 */ UINT8 lfb_green_size; /* LDR */
135 /* 0x29 */ UINT8 lfb_green_pos; /* LDR */
136 /* 0x2A */ UINT8 lfb_blue_size; /* LDR */
137 /* 0x2B */ UINT8 lfb_blue_pos; /* LDR */
138 /* 0x2C */ UINT8 lfb_rsvd_size; /* LDR */
139 /* 0x2D */ UINT8 lfb_rsvd_pos; /* LDR */
142 /* 0x2E */ UINT16 vesa_seg; /* LDR */
143 /* 0x30 */ UINT16 vesa_off; /* LDR */
146 /* 0x32 */ UINT16 lfb_pages; /* LDR */
147 /* 0x34 */ UINT8 lfb_reserved[0x0C]; /* reserved */
150 /* 0x40 */ UINT16 apm_bios_ver; /* LDR */
151 #define NO_APM_BIOS 0x0000
154 /* 0x42 */ UINT16 bios_code_seg; /* LDR */
155 /* 0x44 */ UINT32 bios_entry_point; /* LDR */
156 /* 0x48 */ UINT16 bios_code_seg16; /* LDR */
157 /* 0x4A */ UINT16 bios_data_seg; /* LDR */
160 /* 0x4C */ UINT16 apm_bios_flags; /* LDR */
161 #define NO_32BIT_APM_MASK 0xFFFD
164 /* 0x4E */ UINT32 bios_code_len; /* LDR */
165 /* 0x52 */ UINT16 bios_data_len; /* LDR */
167 /* 0x54 */ UINT8 unused_3[0x2C]; /* unused */
170 /* 0x80 */ UINT8 hd0_info[0x10]; /* LDR */
171 /* 0x90 */ UINT8 hd1_info[0x10]; /* LDR */
174 /* 0xA0 */ UINT16 mca_info_len; /* LDR */
175 /* 0xA2 */ UINT8 mca_info_buf[0x10]; /* LDR */
177 /* 0xB2 */ UINT8 unused_4[0x10E]; /* unused */
179 /* EFI boot loader signature. */
180 /* 0x1C0 */ UINT8 efi_loader_sig[4]; /* LDR */
181 #define EFI_LOADER_SIG_IA32 "EL32"
183 /* Address of the EFI system table. */
184 /* 0x1C4 */ UINT32 efi_sys_tbl; /* LDR */
186 /* EFI memory descriptor size. */
187 /* 0x1C8 */ UINT32 efi_mem_desc_size; /* LDR */
189 /* EFI memory descriptor version. */
190 /* 0x1CC */ UINT32 efi_mem_desc_ver; /* LDR */
192 /* Address & size of EFI memory map. */
193 /* 0x1D0 */ UINT32 efi_mem_map; /* LDR */
194 /* 0x1D4 */ UINT32 efi_mem_map_size; /* LDR */
196 /* Address & size of loader. */
197 /* 0x1D8 */ UINT32 loader_start; /* LDR */
198 /* 0x1DC */ UINT32 loader_size; /* LDR */
200 /* Available contiguous extended memory in KB. */
201 /* 0x1E0 */ UINT32 alt_mem_k; /* LDR */
203 /* 0x1E4 */ UINT32 unused_51; /* unused */
204 /* 0x1E8 */ UINT8 e820_nrmap;
205 /* 0x1E9 */ UINT32 unused_52[2]; /* unused */
207 /* Size of setup code in sectors (1 sector == 512 bytes). */
208 /* 0x1F1 */ UINT8 setup_sectors; /* BLD */
211 /* 0x1F2 */ UINT16 mount_root_rdonly; /* BLD */
214 /* 0x1F4 */ UINT16 sys_size; /* BLD */
217 /* 0x1F6 */ UINT16 swap_dev; /* BLD */
220 /* 0x1F8 */ UINT16 ramdisk_flags; /* BLD */
221 #define RAMDISK_PROMPT 0x8000
222 #define RAMDISK_LOAD 0x4000
225 /* 0x1FA */ UINT16 video_mode_flag; /* BLD */
228 /* 0x1FC */ UINT16 orig_root_dev; /* BLD */
230 /* 0x1FE */ UINT8 unused_6; /* unused */
233 /* 0x1FF */ UINT8 aux_dev_info; /* LDR */
234 #define NO_MOUSE 0x00
235 #define FOUND_MOUSE 0xAA
237 /* Jump past setup data (not used in EFI). */
238 /* 0x200 */ UINT16 jump; /* BLD */
240 /* Setup data signature. */
241 /* 0x202 */ UINT8 setup_sig[4]; /* BLD */
242 #define SETUP_SIG "HdrS"
245 /* 0x206 */ UINT8 hdr_minor; /* BLD */
246 /* 0x207 */ UINT8 hdr_major; /* BLD */
249 /* 0x208 */ UINT32 rm_switch; /* LDD */
252 /* 0x20C */ UINT16 start_sys_seg; /* BLD */
255 /* 0x20E */ UINT16 kernel_verstr_offset; /* BLD */
257 /* Loader type & version. */
258 /* 0x210 */ UINT8 loader_type; /* LDR */
259 #define LDRTYPE_ELILO 0x50 /* 5?h == elilo */
260 /* ?0h == revision */
262 /* 0x211 */ UINT8 loader_flags; /* BLD and LDR */
263 #define LDRFLAG_CAN_USE_HEAP 0x80
264 #define LDRFLAG_BOOT_PARAM_RELOC 0x40
267 /* 0x212 */ UINT16 setup_move_size; /* BLD */
270 /* 0x214 */ UINT32 kernel_start; /* LDR */
273 /* 0x218 */ UINT32 initrd_start; /* LDR */
274 /* 0x21C */ UINT32 initrd_size; /* LDR */
277 /* 0x220 */ UINT32 bootsect_helper; /* BLD */
280 /* 0x224 */ UINT16 heap_end_ptr; /* LDR */
283 /* 0x226 */ UINT16 unused_7; /* LDR */
285 /* 0x228 */ UINT32 cmdline_addr; /* LDR */
286 /* 0x22C */ UINT32 unused_8[41];
287 /* 0x2D0 */ UINT8 e820_map[2560];
293 * The stuff below here is for jumping to the kernel.
297 * Some macros to copy and set memory after EFI has been
301 #define MEMCPY(to, from, cnt) { \
302 UINT8 *t = (UINT8 *)(to); \
303 UINT8 *f = (UINT8 *)(from); \
305 if (t && f && n && (t<f)) { \
309 } else if (t && f && n && (t>f)) { \
318 #define MEMSET(ptr, size, val) { \
319 UINT8 *p = (UINT8 *)(ptr); \
320 UINTN n = (UINTN)(size); \
321 UINT8 v = (UINT8)(val); \
330 * Descriptor table pointer format.
339 extern UINTN high_base_mem;
340 extern UINTN high_ext_mem;
342 extern boot_params_t *param_start;
343 extern UINTN param_size;
345 extern VOID *kernel_start;
346 extern UINTN kernel_size;
348 extern VOID *initrd_start;
349 extern UINTN initrd_size;
350 extern VOID *kernel_load_address;
352 extern dt_addr_t gdt_addr;
353 extern dt_addr_t idt_addr;
355 extern UINT16 init_gdt[];
356 extern UINTN sizeof_init_gdt;
358 extern UINT8 rmswitch_image[];
359 extern UINTN rmswitch_size;
361 extern INTN ia32_use_legacy_free_boot();
364 * How to jump to kernel code
368 start_kernel(VOID *kentry, boot_params_t *bp)
373 * Disable interrupts.
375 asm volatile ( "cli" : : );
378 * Relocate kernel (if needed), and initrd (if present).
379 * Copy kernel first, in case kernel was loaded overlapping where we're
380 * planning to copy the initrd. This assumes that the initrd didn't
381 * get loaded overlapping where we're planning to copy the kernel, but
382 * that's pretty unlikely since we couldn't alloc that space for the
383 * kernel (or the kernel would already be there).
385 if (kernel_start != kernel_load_address) {
386 MEMCPY(kernel_start, kernel_load_address, kernel_size);
389 if (bp->s.initrd_start) {
390 temp = bp->s.initrd_start;
391 MEMCPY(INITRD_START, temp , bp->s.initrd_size);
392 bp->s.initrd_start = INITRD_START;
396 * Copy boot sector, setup data and command line
397 * to final resting place. We need to copy
398 * BOOT_PARAM_MEMSIZE bytes.
401 MEMCPY(high_base_mem, bp, 0x4000);
403 bp = (boot_params_t *)high_base_mem;
404 bp->s.cmdline_addr = high_base_mem + bp->s.cmdline_offset;
407 * Initialize Linux GDT.
410 MEMSET(gdt_addr.base, gdt_addr.limit, 0);
411 MEMCPY(gdt_addr.base, init_gdt, sizeof_init_gdt);
413 if (! ia32_use_legacy_free_boot()) {
416 * Copy our real mode transition code to 0x7C00.
419 MEMCPY(0x7C00, rmswitch_image, rmswitch_size);
421 asm volatile ( "movl $0x7C00, %%ebx" : : );
422 asm volatile ( "jmp *%%ebx" : : );
426 * Load descriptor table pointers.
429 asm volatile ( "lidt %0" : : "m" (idt_addr) );
430 asm volatile ( "lgdt %0" : : "m" (gdt_addr) );
433 * ebx := 0 (%%TBD - do not know why, yet)
434 * ecx := kernel entry point
435 * esi := address of boot sector and setup data
438 asm volatile ( "movl %0, %%esi" : : "m" (high_base_mem) );
439 asm volatile ( "movl %0, %%ecx" : : "m" (kentry) );
440 asm volatile ( "xorl %%ebx, %%ebx" : : );
443 * Jump to kernel entry point.
446 asm volatile ( "jmp *%%ecx" : : );
449 typedef struct sys_img_options {
453 #endif /* __ELILO_SYSDEPS_IA32_H__ */