354 lines
8.7 KiB
C
354 lines
8.7 KiB
C
/* multiboot.c - boot a multiboot OS image. */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB 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 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
* FIXME: The following features from the Multiboot specification still
|
|
* need to be implemented:
|
|
* - VBE support
|
|
* - symbol table
|
|
* - drives table
|
|
* - ROM configuration table
|
|
* - APM table
|
|
*/
|
|
|
|
#include <grub/loader.h>
|
|
#include <grub/command.h>
|
|
#include <grub/machine/loader.h>
|
|
#include <grub/multiboot.h>
|
|
#include <grub/cpu/multiboot.h>
|
|
#include <grub/elf.h>
|
|
#include <grub/aout.h>
|
|
#include <grub/file.h>
|
|
#include <grub/err.h>
|
|
#include <grub/dl.h>
|
|
#include <grub/mm.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/gzio.h>
|
|
#include <grub/env.h>
|
|
#include <grub/cpu/relocator.h>
|
|
#include <grub/video.h>
|
|
#include <grub/memory.h>
|
|
#include <grub/i18n.h>
|
|
|
|
#ifdef GRUB_MACHINE_EFI
|
|
#include <grub/efi/efi.h>
|
|
#endif
|
|
|
|
#if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_QEMU)
|
|
#define DEFAULT_VIDEO_MODE "text"
|
|
#else
|
|
#define DEFAULT_VIDEO_MODE "auto"
|
|
#endif
|
|
|
|
grub_size_t grub_multiboot_alloc_mbi;
|
|
|
|
char *grub_multiboot_payload_orig;
|
|
grub_addr_t grub_multiboot_payload_dest;
|
|
grub_size_t grub_multiboot_pure_size;
|
|
grub_uint32_t grub_multiboot_payload_eip;
|
|
static int accepts_video;
|
|
static int accepts_ega_text;
|
|
static int console_required;
|
|
static grub_dl_t my_mod;
|
|
|
|
|
|
/* Return the length of the Multiboot mmap that will be needed to allocate
|
|
our platform's map. */
|
|
grub_uint32_t
|
|
grub_get_multiboot_mmap_count (void)
|
|
{
|
|
grub_size_t count = 0;
|
|
|
|
auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
|
|
int NESTED_FUNC_ATTR hook (grub_uint64_t addr __attribute__ ((unused)),
|
|
grub_uint64_t size __attribute__ ((unused)),
|
|
grub_uint32_t type __attribute__ ((unused)))
|
|
{
|
|
count++;
|
|
return 0;
|
|
}
|
|
|
|
grub_mmap_iterate (hook);
|
|
|
|
return count;
|
|
}
|
|
|
|
grub_err_t
|
|
grub_multiboot_set_video_mode (void)
|
|
{
|
|
grub_err_t err;
|
|
const char *modevar;
|
|
|
|
if (accepts_video || !GRUB_MACHINE_HAS_VGA_TEXT)
|
|
{
|
|
modevar = grub_env_get ("gfxpayload");
|
|
if (! modevar || *modevar == 0)
|
|
err = grub_video_set_mode (DEFAULT_VIDEO_MODE, 0, 0);
|
|
else
|
|
{
|
|
char *tmp;
|
|
tmp = grub_xasprintf ("%s;" DEFAULT_VIDEO_MODE, modevar);
|
|
if (! tmp)
|
|
return grub_errno;
|
|
err = grub_video_set_mode (tmp, 0, 0);
|
|
grub_free (tmp);
|
|
}
|
|
}
|
|
else
|
|
err = grub_video_set_mode ("text", 0, 0);
|
|
|
|
return err;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_multiboot_boot (void)
|
|
{
|
|
grub_size_t mbi_size;
|
|
grub_err_t err;
|
|
struct grub_relocator32_state state = MULTIBOOT_INITIAL_STATE;
|
|
|
|
state.MULTIBOOT_ENTRY_REGISTER = grub_multiboot_payload_eip;
|
|
|
|
mbi_size = grub_multiboot_get_mbi_size ();
|
|
if (grub_multiboot_alloc_mbi < mbi_size)
|
|
{
|
|
grub_multiboot_payload_orig
|
|
= grub_relocator32_realloc (grub_multiboot_payload_orig,
|
|
grub_multiboot_pure_size + mbi_size);
|
|
if (!grub_multiboot_payload_orig)
|
|
return grub_errno;
|
|
grub_multiboot_alloc_mbi = mbi_size;
|
|
}
|
|
|
|
state.MULTIBOOT_MBI_REGISTER = grub_multiboot_payload_dest
|
|
+ grub_multiboot_pure_size;
|
|
err = grub_multiboot_make_mbi (grub_multiboot_payload_orig,
|
|
grub_multiboot_payload_dest,
|
|
grub_multiboot_pure_size, mbi_size);
|
|
if (err)
|
|
return err;
|
|
|
|
#ifdef GRUB_MACHINE_EFI
|
|
if (! grub_efi_finish_boot_services ())
|
|
grub_fatal ("cannot exit boot services");
|
|
#endif
|
|
|
|
grub_relocator32_boot (grub_multiboot_payload_orig,
|
|
grub_multiboot_payload_dest,
|
|
state);
|
|
|
|
/* Not reached. */
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_multiboot_unload (void)
|
|
{
|
|
grub_multiboot_free_mbi ();
|
|
|
|
grub_relocator32_free (grub_multiboot_payload_orig);
|
|
|
|
grub_multiboot_alloc_mbi = 0;
|
|
|
|
grub_multiboot_payload_orig = NULL;
|
|
grub_dl_unref (my_mod);
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
#define MULTIBOOT_LOAD_ELF64
|
|
#include "multiboot_elfxx.c"
|
|
#undef MULTIBOOT_LOAD_ELF64
|
|
|
|
#define MULTIBOOT_LOAD_ELF32
|
|
#include "multiboot_elfxx.c"
|
|
#undef MULTIBOOT_LOAD_ELF32
|
|
|
|
/* Load ELF32 or ELF64. */
|
|
grub_err_t
|
|
grub_multiboot_load_elf (grub_file_t file, void *buffer)
|
|
{
|
|
if (grub_multiboot_is_elf32 (buffer))
|
|
return grub_multiboot_load_elf32 (file, buffer);
|
|
else if (grub_multiboot_is_elf64 (buffer))
|
|
return grub_multiboot_load_elf64 (file, buffer);
|
|
|
|
return grub_error (GRUB_ERR_UNKNOWN_OS, "unknown ELF class");
|
|
}
|
|
|
|
grub_err_t
|
|
grub_multiboot_set_console (int console_type, int accepted_consoles,
|
|
int width, int height, int depth,
|
|
int console_req)
|
|
{
|
|
console_required = console_req;
|
|
if (!(accepted_consoles
|
|
& (GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER
|
|
| (GRUB_MACHINE_HAS_VGA_TEXT ? GRUB_MULTIBOOT_CONSOLE_EGA_TEXT : 0))))
|
|
{
|
|
if (console_required)
|
|
return grub_error (GRUB_ERR_BAD_OS,
|
|
"OS requires a console but none is available");
|
|
grub_printf ("WARNING: no console will be available to OS");
|
|
accepts_video = 0;
|
|
accepts_ega_text = 0;
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
if (console_type == GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER)
|
|
{
|
|
char *buf;
|
|
if (depth && width && height)
|
|
buf = grub_xasprintf ("%dx%dx%d,%dx%d,auto", width,
|
|
height, depth, width, height);
|
|
else if (width && height)
|
|
buf = grub_xasprintf ("%dx%d,auto", width, height);
|
|
else
|
|
buf = grub_strdup ("auto");
|
|
|
|
if (!buf)
|
|
return grub_errno;
|
|
grub_env_set ("gfxpayload", buf);
|
|
grub_free (buf);
|
|
}
|
|
else
|
|
grub_env_set ("gfxpayload", "text");
|
|
|
|
accepts_video = !!(accepted_consoles & GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER);
|
|
accepts_ega_text = !!(accepted_consoles & GRUB_MULTIBOOT_CONSOLE_EGA_TEXT);
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_multiboot (grub_command_t cmd __attribute__ ((unused)),
|
|
int argc, char *argv[])
|
|
{
|
|
grub_file_t file = 0;
|
|
grub_err_t err;
|
|
|
|
grub_loader_unset ();
|
|
|
|
if (argc == 0)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified");
|
|
|
|
file = grub_gzfile_open (argv[0], 1);
|
|
if (! file)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "couldn't open file");
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
/* Skip filename. */
|
|
grub_multiboot_init_mbi (argc - 1, argv + 1);
|
|
|
|
grub_relocator32_free (grub_multiboot_payload_orig);
|
|
grub_multiboot_payload_orig = NULL;
|
|
|
|
err = grub_multiboot_load (file);
|
|
if (err)
|
|
goto fail;
|
|
|
|
grub_multiboot_set_bootdev ();
|
|
|
|
grub_loader_set (grub_multiboot_boot, grub_multiboot_unload, 0);
|
|
|
|
fail:
|
|
if (file)
|
|
grub_file_close (file);
|
|
|
|
if (grub_errno != GRUB_ERR_NONE)
|
|
{
|
|
grub_relocator32_free (grub_multiboot_payload_orig);
|
|
grub_multiboot_free_mbi ();
|
|
grub_dl_unref (my_mod);
|
|
}
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_module (grub_command_t cmd __attribute__ ((unused)),
|
|
int argc, char *argv[])
|
|
{
|
|
grub_file_t file = 0;
|
|
grub_ssize_t size;
|
|
char *module = 0;
|
|
grub_err_t err;
|
|
|
|
if (argc == 0)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified");
|
|
|
|
if (!grub_multiboot_payload_orig)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT,
|
|
"you need to load the multiboot kernel first");
|
|
|
|
file = grub_gzfile_open (argv[0], 1);
|
|
if (! file)
|
|
return grub_errno;
|
|
|
|
size = grub_file_size (file);
|
|
module = grub_memalign (MULTIBOOT_MOD_ALIGN, size);
|
|
if (! module)
|
|
{
|
|
grub_file_close (file);
|
|
return grub_errno;
|
|
}
|
|
|
|
err = grub_multiboot_add_module ((grub_addr_t) module, size,
|
|
argc - 1, argv + 1);
|
|
if (err)
|
|
{
|
|
grub_file_close (file);
|
|
return err;
|
|
}
|
|
|
|
if (grub_file_read (file, module, size) != size)
|
|
{
|
|
grub_file_close (file);
|
|
return grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file");
|
|
}
|
|
|
|
grub_file_close (file);
|
|
return GRUB_ERR_NONE;;
|
|
}
|
|
|
|
static grub_command_t cmd_multiboot, cmd_module;
|
|
|
|
GRUB_MOD_INIT(multiboot)
|
|
{
|
|
cmd_multiboot =
|
|
#ifdef GRUB_USE_MULTIBOOT2
|
|
grub_register_command ("multiboot2", grub_cmd_multiboot,
|
|
0, N_("Load a multiboot 2 kernel."));
|
|
#else
|
|
grub_register_command ("multiboot", grub_cmd_multiboot,
|
|
0, N_("Load a multiboot kernel."));
|
|
#endif
|
|
|
|
cmd_module =
|
|
grub_register_command ("module", grub_cmd_module,
|
|
0, N_("Load a multiboot module."));
|
|
|
|
my_mod = mod;
|
|
}
|
|
|
|
GRUB_MOD_FINI(multiboot)
|
|
{
|
|
grub_unregister_command (cmd_multiboot);
|
|
grub_unregister_command (cmd_module);
|
|
}
|