diff options
Diffstat (limited to 'grub-core/loader/multiboot.c')
| -rw-r--r-- | grub-core/loader/multiboot.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/grub-core/loader/multiboot.c b/grub-core/loader/multiboot.c new file mode 100644 index 0000000..d9e74b3 --- /dev/null +++ b/grub-core/loader/multiboot.c @@ -0,0 +1,358 @@ +/* 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: + * - drives table + * - ROM configuration table + * - SMBIOS tables + * - Networking information + */ + +#include <grub/loader.h> +#include <grub/command.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/env.h> +#include <grub/cpu/relocator.h> +#include <grub/video.h> +#include <grub/memory.h> +#include <grub/i18n.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#ifdef GRUB_MACHINE_EFI +#include <grub/efi/efi.h> +#endif + +struct grub_relocator *grub_multiboot_relocator = NULL; +grub_uint32_t grub_multiboot_payload_eip; +#if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_MULTIBOOT) || defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_QEMU) +#define DEFAULT_VIDEO_MODE "text" +#else +#define DEFAULT_VIDEO_MODE "auto" +#endif + +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_memory_type_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_err_t err; + struct grub_relocator32_state state = MULTIBOOT_INITIAL_STATE; + + state.MULTIBOOT_ENTRY_REGISTER = grub_multiboot_payload_eip; + + err = grub_multiboot_make_mbi (&state.MULTIBOOT_MBI_REGISTER); + + if (err) + return err; + +#ifdef GRUB_MACHINE_EFI + err = grub_efi_finish_boot_services (NULL, NULL, NULL, NULL, NULL); + if (err) + return err; +#endif + + grub_relocator32_boot (grub_multiboot_relocator, state); + + /* Not reached. */ + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_multiboot_unload (void) +{ + grub_multiboot_free_mbi (); + + grub_relocator_unload (grub_multiboot_relocator); + grub_multiboot_relocator = 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_file_open (argv[0]); + 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_relocator_unload (grub_multiboot_relocator); + grub_multiboot_relocator = grub_relocator_new (); + + if (!grub_multiboot_relocator) + goto fail; + + 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_relocator_unload (grub_multiboot_relocator); + grub_multiboot_relocator = NULL; + 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; + void *module = NULL; + grub_addr_t target; + grub_err_t err; + int nounzip = 0; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified"); + + if (grub_strcmp (argv[0], "--nounzip") == 0) + { + argv++; + argc--; + nounzip = 1; + } + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified"); + + if (!grub_multiboot_relocator) + return grub_error (GRUB_ERR_BAD_ARGUMENT, + "you need to load the multiboot kernel first"); + + if (nounzip) + grub_file_filter_disable_compression (); + + file = grub_file_open (argv[0]); + if (! file) + return grub_errno; + + size = grub_file_size (file); + { + grub_relocator_chunk_t ch; + err = grub_relocator_alloc_chunk_align (grub_multiboot_relocator, &ch, + 0, (0xffffffff - size) + 1, + size, MULTIBOOT_MOD_ALIGN, + GRUB_RELOCATOR_PREFERENCE_NONE); + if (err) + { + grub_file_close (file); + return err; + } + module = get_virtual_current_address (ch); + target = (grub_addr_t) get_virtual_current_address (ch); + } + + err = grub_multiboot_add_module (target, 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.")); + cmd_module = + grub_register_command ("module2", grub_cmd_module, + 0, N_("Load a multiboot 2 module.")); +#else + grub_register_command ("multiboot", grub_cmd_multiboot, + 0, N_("Load a multiboot kernel.")); + cmd_module = + grub_register_command ("module", grub_cmd_module, + 0, N_("Load a multiboot module.")); +#endif + + my_mod = mod; +} + +GRUB_MOD_FINI(multiboot) +{ + grub_unregister_command (cmd_multiboot); + grub_unregister_command (cmd_module); +} |