From b1f6f35ae91d6ee413b8d319e73b7be172a56491 Mon Sep 17 00:00:00 2001 From: Vladimir 'phcoder' Serbinenko Date: Mon, 8 Mar 2010 15:40:57 +0100 Subject: [PATCH] Preparation for mbh tag --- conf/i386.rmk | 6 +- include/grub/multiboot.h | 16 +++ include/multiboot.h | 1 + include/multiboot2.h | 76 ++++++++++- loader/i386/multiboot.c | 236 ++++++++++++++-------------------- loader/i386/multiboot_elfxx.c | 5 +- loader/i386/multiboot_mbi.c | 131 +++++++++++++++++++ loader/multiboot_loader.c | 150 --------------------- 8 files changed, 317 insertions(+), 304 deletions(-) delete mode 100644 loader/multiboot_loader.c diff --git a/conf/i386.rmk b/conf/i386.rmk index e5bd27265..076da3bb2 100644 --- a/conf/i386.rmk +++ b/conf/i386.rmk @@ -34,16 +34,14 @@ setpci_mod_LDFLAGS = $(COMMON_LDFLAGS) pkglib_MODULES += multiboot.mod multiboot_mod_SOURCES = loader/i386/multiboot.c \ - loader/i386/multiboot_mbi.c \ - loader/multiboot_loader.c + loader/i386/multiboot_mbi.c multiboot_mod_CFLAGS = $(COMMON_CFLAGS) multiboot_mod_LDFLAGS = $(COMMON_LDFLAGS) multiboot_mod_ASFLAGS = $(COMMON_ASFLAGS) pkglib_MODULES += multiboot2.mod multiboot2_mod_SOURCES = loader/i386/multiboot.c \ - loader/i386/multiboot_mbi2.c \ - loader/multiboot_loader.c + loader/i386/multiboot_mbi2.c multiboot2_mod_CFLAGS = $(COMMON_CFLAGS) -DGRUB_USE_MULTIBOOT2 multiboot2_mod_LDFLAGS = $(COMMON_LDFLAGS) multiboot2_mod_ASFLAGS = $(COMMON_ASFLAGS) diff --git a/include/grub/multiboot.h b/include/grub/multiboot.h index c108e5eef..89efbc6dd 100644 --- a/include/grub/multiboot.h +++ b/include/grub/multiboot.h @@ -20,6 +20,8 @@ #ifndef GRUB_MULTIBOOT_HEADER #define GRUB_MULTIBOOT_HEADER 1 +#include + #ifdef GRUB_USE_MULTIBOOT2 #include /* Same thing as far as our loader is concerned. */ @@ -63,4 +65,18 @@ grub_multiboot_fill_vbe_info_real (struct grub_vbe_info_block *vbe_control_info, #define GRUB_MACHINE_HAS_VGA_TEXT 0 #endif +#define GRUB_MULTIBOOT_CONSOLE_EGA_TEXT 1 +#define GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER 2 + +grub_err_t +grub_multiboot_set_console (int console_type, int accepted_consoles, + int width, int height, int depth); +grub_err_t +grub_multiboot_load (grub_file_t file); +/* Load ELF32 or ELF64. */ +grub_err_t +grub_multiboot_load_elf (grub_file_t file, void *buffer); +extern grub_size_t grub_multiboot_pure_size; +extern grub_size_t grub_multiboot_alloc_mbi; + #endif /* ! GRUB_MULTIBOOT_HEADER */ diff --git a/include/multiboot.h b/include/multiboot.h index c529c5c5f..fda863e85 100644 --- a/include/multiboot.h +++ b/include/multiboot.h @@ -24,6 +24,7 @@ /* How many bytes from the start of the file we search for the header. */ #define MULTIBOOT_SEARCH 8192 +#define MULTIBOOT_HEADER_ALIGN 4 /* The magic field should contain this. */ #define MULTIBOOT_HEADER_MAGIC 0x1BADB002 diff --git a/include/multiboot2.h b/include/multiboot2.h index 36710ddf6..dae05a7a3 100644 --- a/include/multiboot2.h +++ b/include/multiboot2.h @@ -23,7 +23,8 @@ #define MULTIBOOT_HEADER 1 /* How many bytes from the start of the file we search for the header. */ -#define MULTIBOOT_SEARCH 8192 +#define MULTIBOOT_SEARCH 32768 +#define MULTIBOOT_HEADER_ALIGN 8 /* The magic field should contain this. */ #define MULTIBOOT2_HEADER_MAGIC 0xe85250d6 @@ -62,6 +63,17 @@ #define MULTIBOOT_TAG_TYPE_VBE 7 #define MULTIBOOT_TAG_TYPE_FRAMEBUFFER 8 +#define MULTIBOOT_HEADER_TAG_END 0 +#define MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST 1 +#define MULTIBOOT_HEADER_TAG_ADDRESS 2 +#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS 3 +#define MULTIBOOT_HEADER_TAG_CONSOLE_FLAGS 4 +#define MULTIBOOT_HEADER_TAG_FRAMEBUFFER 5 +#define MULTIBOOT_HEADER_TAG_MODULE_ALIGN 6 + +#define GRUB_MULTIBOOT_ARCHITECTURE_I386 0 +#define MULTIBOOT_HEADER_TAG_OPTIONAL 1 + #ifndef ASM_FILE typedef unsigned char multiboot_uint8_t; @@ -74,21 +86,73 @@ struct multiboot_header /* Must be MULTIBOOT_MAGIC - see above. */ multiboot_uint32_t magic; - /* Feature flags. */ - multiboot_uint32_t flags; + /* ISA */ + multiboot_uint32_t architecture; + + /* Total header length. */ + multiboot_uint32_t header_length; /* The above fields plus this one must equal 0 mod 2^32. */ multiboot_uint32_t checksum; +}; + +struct multiboot_header_tag +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t flags; +}; + +struct multiboot_header_tag_information_request +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t flags; + multiboot_uint32_t requests[0]; +}; - /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */ +struct multiboot_header_tag_address +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t flags; multiboot_uint32_t header_addr; multiboot_uint32_t load_addr; multiboot_uint32_t load_end_addr; multiboot_uint32_t bss_end_addr; +}; + +struct multiboot_header_tag_entry_address +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t flags; multiboot_uint32_t entry_addr; +}; + +struct multiboot_header_tag_console_flags +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t flags; + multiboot_uint32_t console_flags; +}; - /* These are only valid if MULTIBOOT_VIDEO_MODE is set. */ - multiboot_uint32_t mode_type; +struct multiboot_header_tag_framebuffer +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t flags; + multiboot_uint32_t width; + multiboot_uint32_t height; + multiboot_uint32_t depth; +}; + +struct multiboot_header_tag_module_align +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t flags; multiboot_uint32_t width; multiboot_uint32_t height; multiboot_uint32_t depth; diff --git a/loader/i386/multiboot.c b/loader/i386/multiboot.c index dab81dc8c..17fefc85a 100644 --- a/loader/i386/multiboot.c +++ b/loader/i386/multiboot.c @@ -26,10 +26,8 @@ * - APM table */ -/* The bits in the required part of flags field we don't support. */ -#define UNSUPPORTED_FLAGS 0x0000fff8 - #include +#include #include #include #include @@ -45,6 +43,7 @@ #include #include #include +#include #ifdef GRUB_MACHINE_EFI #include @@ -56,14 +55,15 @@ #define DEFAULT_VIDEO_MODE "auto" #endif -extern grub_dl_t my_mod; -static grub_size_t code_size, alloc_mbi; +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 grub_dl_t my_mod; + /* Return the length of the Multiboot mmap that will be needed to allocate our platform's map. */ @@ -178,14 +178,14 @@ grub_multiboot_boot (void) }; mbi_size = grub_multiboot_get_mbi_size (); - if (alloc_mbi < 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; - alloc_mbi = mbi_size; + grub_multiboot_alloc_mbi = mbi_size; } state.ebx = grub_multiboot_payload_dest + grub_multiboot_pure_size; @@ -215,7 +215,7 @@ grub_multiboot_unload (void) grub_relocator32_free (grub_multiboot_payload_orig); - alloc_mbi = 0; + grub_multiboot_alloc_mbi = 0; grub_multiboot_payload_orig = NULL; grub_dl_unref (my_mod); @@ -232,7 +232,7 @@ grub_multiboot_unload (void) #undef MULTIBOOT_LOAD_ELF32 /* Load ELF32 or ELF64. */ -static grub_err_t +grub_err_t grub_multiboot_load_elf (grub_file_t file, void *buffer) { if (grub_multiboot_is_elf32 (buffer)) @@ -243,137 +243,61 @@ grub_multiboot_load_elf (grub_file_t file, void *buffer) return grub_error (GRUB_ERR_UNKNOWN_OS, "unknown ELF class"); } -void -grub_multiboot (int argc, char *argv[]) +grub_err_t +grub_multiboot_set_console (int console_type, int accepted_consoles, + int width, int height, int depth) +{ + 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); + 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; - char buffer[MULTIBOOT_SEARCH]; - struct multiboot_header *header; - grub_ssize_t len; + grub_err_t err; grub_loader_unset (); if (argc == 0) - { - grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified"); - goto fail; - } + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified"); file = grub_gzfile_open (argv[0], 1); if (! file) - { - grub_error (GRUB_ERR_BAD_ARGUMENT, "couldn't open file"); - goto fail; - } + return grub_error (GRUB_ERR_BAD_ARGUMENT, "couldn't open file"); - len = grub_file_read (file, buffer, MULTIBOOT_SEARCH); - if (len < 32) - { - grub_error (GRUB_ERR_BAD_OS, "file too small"); - goto fail; - } - - /* Look for the multiboot header in the buffer. The header should - be at least 12 bytes and aligned on a 4-byte boundary. */ - for (header = (struct multiboot_header *) buffer; - ((char *) header <= buffer + len - 12) || (header = 0); - header = (struct multiboot_header *) ((char *) header + 4)) - { - if (header->magic == MULTIBOOT_HEADER_MAGIC - && !(header->magic + header->flags + header->checksum)) - break; - } - - if (header == 0) - { - grub_error (GRUB_ERR_BAD_ARGUMENT, "no multiboot header found"); - goto fail; - } - - if (header->flags & UNSUPPORTED_FLAGS) - { - grub_error (GRUB_ERR_UNKNOWN_OS, - "unsupported flag: 0x%x", header->flags); - goto fail; - } - - grub_relocator32_free (grub_multiboot_payload_orig); - grub_multiboot_payload_orig = NULL; + grub_dl_ref (my_mod); /* Skip filename. */ grub_multiboot_init_mbi (argc - 1, argv + 1); - if (header->flags & MULTIBOOT_AOUT_KLUDGE) - { - int offset = ((char *) header - buffer - - (header->header_addr - header->load_addr)); - int load_size = ((header->load_end_addr == 0) ? file->size - offset : - header->load_end_addr - header->load_addr); - - if (header->bss_end_addr) - code_size = (header->bss_end_addr - header->load_addr); - else - code_size = load_size; - grub_multiboot_payload_dest = header->load_addr; - - grub_multiboot_pure_size += code_size; - - /* Allocate a bit more to avoid relocations in most cases. */ - alloc_mbi = grub_multiboot_get_mbi_size () + 65536; - grub_multiboot_payload_orig - = grub_relocator32_alloc (grub_multiboot_pure_size + alloc_mbi); - - if (! grub_multiboot_payload_orig) - goto fail; - - if ((grub_file_seek (file, offset)) == (grub_off_t) -1) - goto fail; - - grub_file_read (file, (void *) grub_multiboot_payload_orig, load_size); - if (grub_errno) - goto fail; - - if (header->bss_end_addr) - grub_memset ((void *) (grub_multiboot_payload_orig + load_size), 0, - header->bss_end_addr - header->load_addr - load_size); - - grub_multiboot_payload_eip = header->entry_addr; + grub_relocator32_free (grub_multiboot_payload_orig); + grub_multiboot_payload_orig = NULL; - } - else if (grub_multiboot_load_elf (file, buffer) != GRUB_ERR_NONE) + err = grub_multiboot_load (file); + if (err) goto fail; - if (header->flags & MULTIBOOT_VIDEO_MODE) - { - switch (header->mode_type) - { - case 1: - grub_env_set ("gfxpayload", "text"); - break; - - case 0: - { - char *buf; - if (header->depth && header->width && header->height) - buf = grub_xasprintf ("%dx%dx%d,%dx%d,auto", header->width, - header->height, header->depth, header->width, - header->height); - else if (header->width && header->height) - buf = grub_xasprintf ("%dx%d,auto", header->width, header->height); - else - buf = grub_strdup ("auto"); - - if (!buf) - goto fail; - grub_env_set ("gfxpayload", buf); - grub_free (buf); - break; - } - } - } - - accepts_video = !!(header->flags & MULTIBOOT_VIDEO_MODE); - grub_multiboot_set_bootdev (); grub_loader_set (grub_multiboot_boot, grub_multiboot_unload, 0); @@ -385,12 +309,16 @@ grub_multiboot (int argc, char *argv[]) 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; } -void -grub_module (int argc, char *argv[]) +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; @@ -398,40 +326,64 @@ grub_module (int argc, char *argv[]) grub_err_t err; if (argc == 0) - { - grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified"); - goto fail; - } + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified"); if (!grub_multiboot_payload_orig) - { - grub_error (GRUB_ERR_BAD_ARGUMENT, - "you need to load the multiboot kernel first"); - goto fail; - } + return grub_error (GRUB_ERR_BAD_ARGUMENT, + "you need to load the multiboot kernel first"); file = grub_gzfile_open (argv[0], 1); if (! file) - goto fail; + return grub_errno; size = grub_file_size (file); module = grub_memalign (MULTIBOOT_MOD_ALIGN, size); if (! module) - goto fail; + { + grub_file_close (file); + return grub_errno; + } err = grub_multiboot_add_module ((grub_addr_t) module, size, argc - 1, argv + 1); if (err) - goto fail; + { + grub_file_close (file); + return err; + } if (grub_file_read (file, module, size) != size) { - grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file"); - goto fail; + grub_file_close (file); + return grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file"); } - fail: - if (file) - grub_file_close (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); +} diff --git a/loader/i386/multiboot_elfxx.c b/loader/i386/multiboot_elfxx.c index 2e35183a4..05fb2c1c1 100644 --- a/loader/i386/multiboot_elfxx.c +++ b/loader/i386/multiboot_elfxx.c @@ -53,6 +53,7 @@ CONCAT(grub_multiboot_load_elf, XX) (grub_file_t file, void *buffer) char *phdr_base; int lowest_segment = -1, highest_segment = -1; int i; + grub_size_t code_size; if (ehdr->e_ident[EI_CLASS] != ELFCLASSXX) return grub_error (GRUB_ERR_UNKNOWN_OS, "invalid ELF class"); @@ -102,9 +103,9 @@ CONCAT(grub_multiboot_load_elf, XX) (grub_file_t file, void *buffer) grub_multiboot_pure_size += code_size; - alloc_mbi = grub_multiboot_get_mbi_size (); + grub_multiboot_alloc_mbi = grub_multiboot_get_mbi_size () + 65536; grub_multiboot_payload_orig - = grub_relocator32_alloc (grub_multiboot_pure_size + alloc_mbi + 65536); + = grub_relocator32_alloc (grub_multiboot_pure_size + grub_multiboot_alloc_mbi); if (!grub_multiboot_payload_orig) return grub_errno; diff --git a/loader/i386/multiboot_mbi.c b/loader/i386/multiboot_mbi.c index 0d5db3c13..e273e29ca 100644 --- a/loader/i386/multiboot_mbi.c +++ b/loader/i386/multiboot_mbi.c @@ -23,6 +23,7 @@ #endif #include #include +#include #include #include #include @@ -30,6 +31,10 @@ #include #include #include +#include + +/* The bits in the required part of flags field we don't support. */ +#define UNSUPPORTED_FLAGS 0x0000fff8 struct module { @@ -48,6 +53,132 @@ static char *cmdline = NULL; static grub_uint32_t bootdev; static int bootdev_set; +grub_err_t +grub_multiboot_load (grub_file_t file) +{ + char *buffer; + grub_ssize_t len; + struct multiboot_header *header; + grub_err_t err; + + buffer = grub_malloc (MULTIBOOT_SEARCH); + if (!buffer) + return grub_errno; + + len = grub_file_read (file, buffer, MULTIBOOT_SEARCH); + if (len < 32) + { + grub_free (buffer); + return grub_error (GRUB_ERR_BAD_OS, "file too small"); + } + + /* Look for the multiboot header in the buffer. The header should + be at least 12 bytes and aligned on a 4-byte boundary. */ + for (header = (struct multiboot_header *) buffer; + ((char *) header <= buffer + len - 12) || (header = 0); + header = (struct multiboot_header *) ((char *) header + MULTIBOOT_HEADER_ALIGN)) + { + if (header->magic == MULTIBOOT_HEADER_MAGIC + && !(header->magic + header->flags + header->checksum)) + break; + } + + if (header == 0) + { + grub_free (buffer); + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no multiboot header found"); + } + + if (header->flags & UNSUPPORTED_FLAGS) + { + grub_free (buffer); + return grub_error (GRUB_ERR_UNKNOWN_OS, + "unsupported flag: 0x%x", header->flags); + } + + if (header->flags & MULTIBOOT_AOUT_KLUDGE) + { + int offset = ((char *) header - buffer - + (header->header_addr - header->load_addr)); + int load_size = ((header->load_end_addr == 0) ? file->size - offset : + header->load_end_addr - header->load_addr); + grub_size_t code_size; + + if (header->bss_end_addr) + code_size = (header->bss_end_addr - header->load_addr); + else + code_size = load_size; + grub_multiboot_payload_dest = header->load_addr; + + grub_multiboot_pure_size += code_size; + + /* Allocate a bit more to avoid relocations in most cases. */ + grub_multiboot_alloc_mbi = grub_multiboot_get_mbi_size () + 65536; + grub_multiboot_payload_orig + = grub_relocator32_alloc (grub_multiboot_pure_size + grub_multiboot_alloc_mbi); + + if (! grub_multiboot_payload_orig) + { + grub_free (buffer); + return grub_errno; + } + + if ((grub_file_seek (file, offset)) == (grub_off_t) -1) + { + grub_free (buffer); + return grub_errno; + } + + grub_file_read (file, (void *) grub_multiboot_payload_orig, load_size); + if (grub_errno) + { + grub_free (buffer); + return grub_errno; + } + + if (header->bss_end_addr) + grub_memset ((void *) (grub_multiboot_payload_orig + load_size), 0, + header->bss_end_addr - header->load_addr - load_size); + + grub_multiboot_payload_eip = header->entry_addr; + + } + else + { + err = grub_multiboot_load_elf (file, buffer); + if (err) + { + grub_free (buffer); + return err; + } + } + + if (header->flags & MULTIBOOT_VIDEO_MODE) + { + switch (header->mode_type) + { + case 1: + err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_EGA_TEXT, + GRUB_MULTIBOOT_CONSOLE_EGA_TEXT + | GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER, + 0, 0, 0); + break; + case 0: + err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER, + GRUB_MULTIBOOT_CONSOLE_EGA_TEXT + | GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER, + header->width, header->height, + header->depth); + break; + } + } + else + err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_EGA_TEXT, + GRUB_MULTIBOOT_CONSOLE_EGA_TEXT, + 0, 0, 0); + return err; +} + grub_size_t grub_multiboot_get_mbi_size (void) { diff --git a/loader/multiboot_loader.c b/loader/multiboot_loader.c deleted file mode 100644 index 6d042fa81..000000000 --- a/loader/multiboot_loader.c +++ /dev/null @@ -1,150 +0,0 @@ -/* multiboot_loader.c - boot multiboot kernel image */ -/* - * GRUB -- GRand Unified Bootloader - * Copyright (C) 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 . - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -grub_dl_t my_mod; - -static int -find_multi_boot1_header (grub_file_t file) -{ - struct multiboot_header *header; - char buffer[MULTIBOOT_SEARCH]; - int found_status = 0; - grub_ssize_t len; - - len = grub_file_read (file, buffer, MULTIBOOT_SEARCH); - if (len < 32) - return found_status; - - /* Look for the multiboot header in the buffer. The header should - be at least 12 bytes and aligned on a 4-byte boundary. */ - for (header = (struct multiboot_header *) buffer; - ((char *) header <= buffer + len - 12) || (header = 0); - header = (struct multiboot_header *) ((char *) header + 4)) - { - if (header->magic == MULTIBOOT_HEADER_MAGIC - && !(header->magic + header->flags + header->checksum)) - { - found_status = 1; - break; - } - } - - return found_status; -} - -static grub_err_t -grub_cmd_multiboot_loader (grub_command_t cmd __attribute__ ((unused)), - int argc, char *argv[]) -{ - grub_file_t file = 0; - int header_multi_ver_found = 0; - - grub_dl_ref (my_mod); - - if (argc == 0) - { - grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified"); - goto fail; - } - - file = grub_gzfile_open (argv[0], 1); - if (! file) - { - grub_error (GRUB_ERR_BAD_ARGUMENT, "couldn't open file"); - goto fail; - } - - /* find which header is in the file */ - if (find_multi_boot1_header (file)) - header_multi_ver_found = 1; - else - { - grub_error (GRUB_ERR_BAD_OS, "multiboot header not found"); - goto fail; - } - - /* close file before calling functions */ - if (file) - grub_file_close (file); - - /* Launch multi boot with header */ - - grub_dprintf ("multiboot_loader", - "Launching multiboot 1 grub_multiboot() function\n"); - grub_multiboot (argc, argv); - - return grub_errno; - -fail: - if (file) - grub_file_close (file); - - grub_dl_unref (my_mod); - - return grub_errno; -} - -static grub_err_t -grub_cmd_module_loader (grub_command_t cmd __attribute__ ((unused)), - int argc, char *argv[]) -{ - - grub_dprintf("multiboot_loader", - "Launching multiboot 1 grub_module() function\n"); - grub_module (argc, argv); - - return grub_errno; -} - -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_loader, - 0, N_("Load a multiboot 2 kernel.")); -#else - grub_register_command ("multiboot", grub_cmd_multiboot_loader, - 0, N_("Load a multiboot kernel.")); -#endif - - cmd_module = - grub_register_command ("module", grub_cmd_module_loader, - 0, N_("Load a multiboot module.")); - - my_mod = mod; -} - -GRUB_MOD_FINI(multiboot) -{ - grub_unregister_command (cmd_multiboot); - grub_unregister_command (cmd_module); -} -- 2.47.3