1 /* multiboot.c - boot a multiboot OS image. */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
6 * GRUB is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * GRUB is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
21 * FIXME: The following features from the Multiboot specification still
22 * need to be implemented:
24 * - ROM configuration table
26 * - Networking information
29 #include <grub/loader.h>
30 #include <grub/command.h>
31 #include <grub/multiboot.h>
32 #include <grub/cpu/multiboot.h>
34 #include <grub/aout.h>
35 #include <grub/file.h>
39 #include <grub/misc.h>
41 #include <grub/cpu/relocator.h>
42 #include <grub/video.h>
43 #include <grub/memory.h>
44 #include <grub/i18n.h>
46 GRUB_MOD_LICENSE ("GPLv3+");
48 #ifdef GRUB_MACHINE_EFI
49 #include <grub/efi/efi.h>
52 struct grub_relocator *grub_multiboot_relocator = NULL;
53 grub_uint32_t grub_multiboot_payload_eip;
54 #if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_MULTIBOOT) || defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_QEMU)
55 #define DEFAULT_VIDEO_MODE "text"
57 #define DEFAULT_VIDEO_MODE "auto"
60 static int accepts_video;
61 static int accepts_ega_text;
62 static int console_required;
63 static grub_dl_t my_mod;
66 /* Helper for grub_get_multiboot_mmap_count. */
68 count_hook (grub_uint64_t addr __attribute__ ((unused)),
69 grub_uint64_t size __attribute__ ((unused)),
70 grub_memory_type_t type __attribute__ ((unused)), void *data)
72 grub_size_t *count = data;
78 /* Return the length of the Multiboot mmap that will be needed to allocate
79 our platform's map. */
81 grub_get_multiboot_mmap_count (void)
83 grub_size_t count = 0;
85 grub_mmap_iterate (count_hook, &count);
91 grub_multiboot_set_video_mode (void)
96 #if GRUB_MACHINE_HAS_VGA_TEXT
100 modevar = grub_env_get ("gfxpayload");
101 if (! modevar || *modevar == 0)
102 err = grub_video_set_mode (DEFAULT_VIDEO_MODE, 0, 0);
106 tmp = grub_xasprintf ("%s;" DEFAULT_VIDEO_MODE, modevar);
109 err = grub_video_set_mode (tmp, 0, 0);
113 #if GRUB_MACHINE_HAS_VGA_TEXT
115 err = grub_video_set_mode ("text", 0, 0);
121 #ifdef GRUB_MACHINE_EFI
123 #define grub_relocator_efi_boot grub_relocator64_efi_boot
124 #define grub_relocator_efi_state grub_relocator64_efi_state
128 #ifdef grub_relocator_efi_boot
130 efi_boot (struct grub_relocator *rel,
131 grub_uint32_t target)
133 struct grub_relocator_efi_state state_efi = MULTIBOOT_EFI_INITIAL_STATE;
135 state_efi.MULTIBOOT_EFI_ENTRY_REGISTER = grub_multiboot_payload_eip;
136 state_efi.MULTIBOOT_EFI_MBI_REGISTER = target;
138 grub_relocator_efi_boot (rel, state_efi);
141 #define grub_efi_is_finished 1
143 efi_boot (struct grub_relocator *rel __attribute__ ((unused)),
144 grub_uint32_t target __attribute__ ((unused)))
149 #if defined (__i386__) || defined (__x86_64__)
151 normal_boot (struct grub_relocator *rel, struct grub_relocator32_state state)
153 grub_relocator32_boot (rel, state, 0);
157 normal_boot (struct grub_relocator *rel, struct grub_relocator32_state state)
159 grub_relocator32_boot (rel, state);
164 grub_multiboot_boot (void)
167 struct grub_relocator32_state state = MULTIBOOT_INITIAL_STATE;
169 state.MULTIBOOT_ENTRY_REGISTER = grub_multiboot_payload_eip;
171 err = grub_multiboot_make_mbi (&state.MULTIBOOT_MBI_REGISTER);
176 if (grub_efi_is_finished)
177 normal_boot (grub_multiboot_relocator, state);
179 efi_boot (grub_multiboot_relocator, state.MULTIBOOT_MBI_REGISTER);
182 return GRUB_ERR_NONE;
186 grub_multiboot_unload (void)
188 grub_multiboot_free_mbi ();
190 grub_relocator_unload (grub_multiboot_relocator);
191 grub_multiboot_relocator = NULL;
193 grub_dl_unref (my_mod);
195 return GRUB_ERR_NONE;
198 static grub_uint64_t highest_load;
200 #define MULTIBOOT_LOAD_ELF64
201 #include "multiboot_elfxx.c"
202 #undef MULTIBOOT_LOAD_ELF64
204 #define MULTIBOOT_LOAD_ELF32
205 #include "multiboot_elfxx.c"
206 #undef MULTIBOOT_LOAD_ELF32
208 /* Load ELF32 or ELF64. */
210 grub_multiboot_load_elf (mbi_load_data_t *mld)
212 if (grub_multiboot_is_elf32 (mld->buffer))
213 return grub_multiboot_load_elf32 (mld);
214 else if (grub_multiboot_is_elf64 (mld->buffer))
215 return grub_multiboot_load_elf64 (mld);
217 return grub_error (GRUB_ERR_UNKNOWN_OS, N_("invalid arch-dependent ELF magic"));
221 grub_multiboot_set_console (int console_type, int accepted_consoles,
222 int width, int height, int depth,
225 console_required = console_req;
226 if (!(accepted_consoles
227 & (GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER
228 | (GRUB_MACHINE_HAS_VGA_TEXT ? GRUB_MULTIBOOT_CONSOLE_EGA_TEXT : 0))))
230 if (console_required)
231 return grub_error (GRUB_ERR_BAD_OS,
232 "OS requires a console but none is available");
233 grub_puts_ (N_("WARNING: no console will be available to OS"));
235 accepts_ega_text = 0;
236 return GRUB_ERR_NONE;
239 if (console_type == GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER)
242 if (depth && width && height)
243 buf = grub_xasprintf ("%dx%dx%d,%dx%d,auto", width,
244 height, depth, width, height);
245 else if (width && height)
246 buf = grub_xasprintf ("%dx%d,auto", width, height);
248 buf = grub_strdup ("auto");
252 grub_env_set ("gfxpayload", buf);
257 #if GRUB_MACHINE_HAS_VGA_TEXT
258 grub_env_set ("gfxpayload", "text");
260 /* Always use video if no VGA text is available. */
261 grub_env_set ("gfxpayload", "auto");
265 accepts_video = !!(accepted_consoles & GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER);
266 accepts_ega_text = !!(accepted_consoles & GRUB_MULTIBOOT_CONSOLE_EGA_TEXT);
267 return GRUB_ERR_NONE;
271 grub_cmd_multiboot (grub_command_t cmd __attribute__ ((unused)),
272 int argc, char *argv[])
274 grub_file_t file = 0;
277 grub_loader_unset ();
281 #ifndef GRUB_USE_MULTIBOOT2
282 grub_multiboot_quirks = GRUB_MULTIBOOT_QUIRKS_NONE;
283 int option_found = 0;
288 if (argc != 0 && grub_strcmp (argv[0], "--quirk-bad-kludge") == 0)
293 grub_multiboot_quirks |= GRUB_MULTIBOOT_QUIRK_BAD_KLUDGE;
296 if (argc != 0 && grub_strcmp (argv[0], "--quirk-modules-after-kernel") == 0)
301 grub_multiboot_quirks |= GRUB_MULTIBOOT_QUIRK_MODULES_AFTER_KERNEL;
303 } while (option_found);
307 return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
309 file = grub_file_open (argv[0]);
313 grub_dl_ref (my_mod);
316 grub_multiboot_init_mbi (argc - 1, argv + 1);
318 grub_relocator_unload (grub_multiboot_relocator);
319 grub_multiboot_relocator = grub_relocator_new ();
321 if (!grub_multiboot_relocator)
324 err = grub_multiboot_load (file, argv[0]);
328 grub_multiboot_set_bootdev ();
330 grub_loader_set (grub_multiboot_boot, grub_multiboot_unload, 0);
334 grub_file_close (file);
336 if (grub_errno != GRUB_ERR_NONE)
338 grub_relocator_unload (grub_multiboot_relocator);
339 grub_multiboot_relocator = NULL;
340 grub_dl_unref (my_mod);
347 grub_cmd_module (grub_command_t cmd __attribute__ ((unused)),
348 int argc, char *argv[])
350 grub_file_t file = 0;
356 grub_uint64_t lowest_addr = 0;
359 return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
361 if (grub_strcmp (argv[0], "--nounzip") == 0)
369 return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
371 if (!grub_multiboot_relocator)
372 return grub_error (GRUB_ERR_BAD_ARGUMENT,
373 N_("you need to load the kernel first"));
376 grub_file_filter_disable_compression ();
378 file = grub_file_open (argv[0]);
382 #ifndef GRUB_USE_MULTIBOOT2
383 lowest_addr = 0x100000;
384 if (grub_multiboot_quirks & GRUB_MULTIBOOT_QUIRK_MODULES_AFTER_KERNEL)
385 lowest_addr = ALIGN_UP (highest_load + 1048576, 4096);
388 size = grub_file_size (file);
391 grub_relocator_chunk_t ch;
392 err = grub_relocator_alloc_chunk_align (grub_multiboot_relocator, &ch,
393 lowest_addr, (0xffffffff - size) + 1,
394 size, MULTIBOOT_MOD_ALIGN,
395 GRUB_RELOCATOR_PREFERENCE_NONE, 1);
398 grub_file_close (file);
401 module = get_virtual_current_address (ch);
402 target = get_physical_target_address (ch);
410 err = grub_multiboot_add_module (target, size, argc - 1, argv + 1);
413 grub_file_close (file);
417 if (size && grub_file_read (file, module, size) != size)
419 grub_file_close (file);
421 grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
426 grub_file_close (file);
427 return GRUB_ERR_NONE;
430 static grub_command_t cmd_multiboot, cmd_module;
432 GRUB_MOD_INIT(multiboot)
435 #ifdef GRUB_USE_MULTIBOOT2
436 grub_register_command ("multiboot2", grub_cmd_multiboot,
437 0, N_("Load a multiboot 2 kernel."));
439 grub_register_command ("module2", grub_cmd_module,
440 0, N_("Load a multiboot 2 module."));
442 grub_register_command ("multiboot", grub_cmd_multiboot,
443 0, N_("Load a multiboot kernel."));
445 grub_register_command ("module", grub_cmd_module,
446 0, N_("Load a multiboot module."));
452 GRUB_MOD_FINI(multiboot)
454 grub_unregister_command (cmd_multiboot);
455 grub_unregister_command (cmd_module);