480 lines
13 KiB
C
480 lines
13 KiB
C
/* multiboot.c - boot a multiboot OS image. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* FIXME: The following features from the Multiboot specification still
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* need to be implemented:
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* - VBE support
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* - symbol table
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* - drives table
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* - ROM configuration table
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* - APM table
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*/
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#include <grub/loader.h>
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#include <grub/machine/loader.h>
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#include <grub/multiboot.h>
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#include <grub/machine/init.h>
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#include <grub/machine/memory.h>
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#include <grub/cpu/multiboot.h>
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#include <grub/elf.h>
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#include <grub/aout.h>
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#include <grub/file.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/gzio.h>
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#include <grub/env.h>
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#ifdef GRUB_MACHINE_PCBIOS
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#include <grub/machine/biosnum.h>
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#include <grub/disk.h>
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#include <grub/device.h>
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#include <grub/partition.h>
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#endif
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extern grub_dl_t my_mod;
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static struct grub_multiboot_info *mbi, *mbi_dest;
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static grub_addr_t entry;
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static char *playground;
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static grub_size_t code_size;
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static grub_err_t
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grub_multiboot_boot (void)
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{
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grub_multiboot_real_boot (entry, mbi_dest);
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/* Not reached. */
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_multiboot_unload (void)
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{
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if (mbi)
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{
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unsigned int i;
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for (i = 0; i < mbi->mods_count; i++)
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{
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grub_free ((void *)
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((struct grub_mod_list *) mbi->mods_addr)[i].mod_start);
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grub_free ((void *)
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((struct grub_mod_list *) mbi->mods_addr)[i].cmdline);
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}
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grub_free ((void *) mbi->mods_addr);
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grub_free ((void *) mbi->cmdline);
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grub_free (mbi);
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}
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mbi = 0;
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grub_dl_unref (my_mod);
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return GRUB_ERR_NONE;
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}
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/* Return the length of the Multiboot mmap that will be needed to allocate
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our platform's map. */
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static grub_uint32_t
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grub_get_multiboot_mmap_len (void)
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{
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grub_size_t count = 0;
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auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
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int NESTED_FUNC_ATTR hook (grub_uint64_t addr __attribute__ ((unused)),
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grub_uint64_t size __attribute__ ((unused)),
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grub_uint32_t type __attribute__ ((unused)))
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{
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count++;
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return 0;
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}
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grub_mmap_iterate (hook);
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return count * sizeof (struct grub_multiboot_mmap_entry);
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}
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/* Fill previously allocated Multiboot mmap. */
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static void
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grub_fill_multiboot_mmap (struct grub_multiboot_mmap_entry *first_entry)
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{
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struct grub_multiboot_mmap_entry *mmap_entry = (struct grub_multiboot_mmap_entry *) first_entry;
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auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
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int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
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{
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mmap_entry->addr = addr;
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mmap_entry->len = size;
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mmap_entry->type = type;
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mmap_entry->size = sizeof (struct grub_multiboot_mmap_entry) - sizeof (mmap_entry->size);
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mmap_entry++;
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return 0;
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}
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grub_mmap_iterate (hook);
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}
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#define MULTIBOOT_LOAD_ELF64
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#include "multiboot_elfxx.c"
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#undef MULTIBOOT_LOAD_ELF64
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#define MULTIBOOT_LOAD_ELF32
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#include "multiboot_elfxx.c"
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#undef MULTIBOOT_LOAD_ELF32
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/* Load ELF32 or ELF64. */
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static grub_err_t
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grub_multiboot_load_elf (grub_file_t file, void *buffer)
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{
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if (grub_multiboot_is_elf32 (buffer))
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return grub_multiboot_load_elf32 (file, buffer);
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else if (grub_multiboot_is_elf64 (buffer))
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return grub_multiboot_load_elf64 (file, buffer);
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return grub_error (GRUB_ERR_UNKNOWN_OS, "unknown ELF class");
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}
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static int
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grub_multiboot_get_bootdev (grub_uint32_t *bootdev)
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{
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#ifdef GRUB_MACHINE_PCBIOS
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char *p;
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grub_uint32_t biosdev, slice = ~0, part = ~0;
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grub_device_t dev;
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biosdev = grub_get_root_biosnumber ();
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dev = grub_device_open (0);
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if (dev && dev->disk && dev->disk->partition)
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{
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p = dev->disk->partition->partmap->get_name (dev->disk->partition);
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if (p)
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{
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if ((p[0] >= '0') && (p[0] <= '9'))
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{
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slice = grub_strtoul (p, &p, 0) - 1;
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if ((p) && (p[0] == ','))
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p++;
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}
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if ((p[0] >= 'a') && (p[0] <= 'z'))
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part = p[0] - 'a';
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}
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}
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if (dev)
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grub_device_close (dev);
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*bootdev = ((biosdev & 0xff) << 24) | ((slice & 0xff) << 16)
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| ((part & 0xff) << 8) | 0xff;
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return (biosdev != ~0UL);
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#else
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*bootdev = 0xffffffff;
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return 0;
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#endif
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}
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void
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grub_multiboot (int argc, char *argv[])
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{
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grub_file_t file = 0;
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char buffer[MULTIBOOT_SEARCH], *cmdline = 0, *p;
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struct grub_multiboot_header *header;
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grub_ssize_t len, cmdline_length, boot_loader_name_length;
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grub_uint32_t mmap_length;
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int i;
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grub_loader_unset ();
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if (argc == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "No kernel specified");
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goto fail;
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}
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file = grub_gzfile_open (argv[0], 1);
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if (! file)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "Couldn't open file");
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goto fail;
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}
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len = grub_file_read (file, buffer, MULTIBOOT_SEARCH);
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if (len < 32)
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{
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grub_error (GRUB_ERR_BAD_OS, "File too small");
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goto fail;
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}
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/* Look for the multiboot header in the buffer. The header should
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be at least 12 bytes and aligned on a 4-byte boundary. */
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for (header = (struct grub_multiboot_header *) buffer;
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((char *) header <= buffer + len - 12) || (header = 0);
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header = (struct grub_multiboot_header *) ((char *) header + 4))
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{
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if (header->magic == MULTIBOOT_MAGIC
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&& !(header->magic + header->flags + header->checksum))
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break;
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}
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if (header == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "No multiboot header found");
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goto fail;
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}
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if (header->flags & MULTIBOOT_UNSUPPORTED)
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{
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grub_error (GRUB_ERR_UNKNOWN_OS,
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"Unsupported flag: 0x%x", header->flags);
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goto fail;
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}
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if (playground)
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{
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grub_free (playground);
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playground = NULL;
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}
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mmap_length = grub_get_multiboot_mmap_len ();
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/* Figure out cmdline length. */
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for (i = 0, cmdline_length = 0; i < argc; i++)
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cmdline_length += grub_strlen (argv[i]) + 1;
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boot_loader_name_length = sizeof(PACKAGE_STRING);
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#define cmdline_addr(x) ((void *) ((x) + code_size))
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#define boot_loader_name_addr(x) \
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((void *) ((x) + code_size + cmdline_length))
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#define mbi_addr(x) ((void *) ((x) + code_size + cmdline_length + boot_loader_name_length))
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#define mmap_addr(x) ((void *) ((x) + code_size + cmdline_length + boot_loader_name_length + sizeof (struct grub_multiboot_info)))
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grub_multiboot_payload_size = cmdline_length
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/* boot_loader_name_length might need to grow for mbi,etc to be aligned (see below) */
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+ boot_loader_name_length + 3
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+ sizeof (struct grub_multiboot_info) + mmap_length;
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if (header->flags & MULTIBOOT_AOUT_KLUDGE)
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{
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int offset = ((char *) header - buffer -
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(header->header_addr - header->load_addr));
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int load_size = ((header->load_end_addr == 0) ? file->size - offset :
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header->load_end_addr - header->load_addr);
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if (header->bss_end_addr)
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code_size = (header->bss_end_addr - header->load_addr);
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else
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code_size = load_size;
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grub_multiboot_payload_dest = header->load_addr;
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grub_multiboot_payload_size += code_size;
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playground = grub_malloc (RELOCATOR_SIZEOF(forward) + grub_multiboot_payload_size + RELOCATOR_SIZEOF(backward));
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if (! playground)
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goto fail;
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grub_multiboot_payload_orig = (long) playground + RELOCATOR_SIZEOF(forward);
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if ((grub_file_seek (file, offset)) == (grub_off_t) - 1)
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goto fail;
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grub_file_read (file, (void *) grub_multiboot_payload_orig, load_size);
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if (grub_errno)
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goto fail;
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if (header->bss_end_addr)
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grub_memset ((void *) (grub_multiboot_payload_orig + load_size), 0,
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header->bss_end_addr - header->load_addr - load_size);
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grub_multiboot_payload_entry_offset = header->entry_addr - header->load_addr;
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}
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else if (grub_multiboot_load_elf (file, buffer) != GRUB_ERR_NONE)
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goto fail;
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/* This provides alignment for the MBI, the memory map and the backward relocator. */
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boot_loader_name_length += (0x04 - ((unsigned long) mbi_addr (grub_multiboot_payload_dest) & 0x03));
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mbi = mbi_addr (grub_multiboot_payload_orig);
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mbi_dest = mbi_addr (grub_multiboot_payload_dest);
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grub_memset (mbi, 0, sizeof (struct grub_multiboot_info));
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mbi->mmap_length = mmap_length;
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grub_fill_multiboot_mmap (mmap_addr (grub_multiboot_payload_orig));
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/* FIXME: grub_uint32_t will break for addresses above 4 GiB, but is mandated
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by the spec. Is there something we can do about it? */
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mbi->mmap_addr = (grub_uint32_t) mmap_addr (grub_multiboot_payload_dest);
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mbi->flags |= MULTIBOOT_INFO_MEM_MAP;
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if (grub_multiboot_payload_dest >= grub_multiboot_payload_orig)
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{
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grub_memmove (playground, &grub_multiboot_forward_relocator, RELOCATOR_SIZEOF(forward));
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entry = (grub_addr_t) playground;
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}
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else
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{
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grub_memmove ((char *) (grub_multiboot_payload_orig + grub_multiboot_payload_size),
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&grub_multiboot_backward_relocator, RELOCATOR_SIZEOF(backward));
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entry = (grub_addr_t) grub_multiboot_payload_orig + grub_multiboot_payload_size;
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}
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grub_dprintf ("multiboot_loader", "dest=%p, size=0x%x, entry_offset=0x%x\n",
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(void *) grub_multiboot_payload_dest,
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grub_multiboot_payload_size,
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grub_multiboot_payload_entry_offset);
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/* Convert from bytes to kilobytes. */
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mbi->mem_lower = grub_mmap_get_lower () / 1024;
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mbi->mem_upper = grub_mmap_get_upper () / 1024;
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mbi->flags |= MULTIBOOT_INFO_MEMORY;
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cmdline = p = cmdline_addr (grub_multiboot_payload_orig);
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if (! cmdline)
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goto fail;
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for (i = 0; i < argc; i++)
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{
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p = grub_stpcpy (p, argv[i]);
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*(p++) = ' ';
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}
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/* Remove the space after the last word. */
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*(--p) = '\0';
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mbi->flags |= MULTIBOOT_INFO_CMDLINE;
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mbi->cmdline = (grub_uint32_t) cmdline_addr (grub_multiboot_payload_dest);
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grub_strcpy (boot_loader_name_addr (grub_multiboot_payload_orig), PACKAGE_STRING);
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mbi->flags |= MULTIBOOT_INFO_BOOT_LOADER_NAME;
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mbi->boot_loader_name = (grub_uint32_t) boot_loader_name_addr (grub_multiboot_payload_dest);
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if (grub_multiboot_get_bootdev (&mbi->boot_device))
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mbi->flags |= MULTIBOOT_INFO_BOOTDEV;
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grub_loader_set (grub_multiboot_boot, grub_multiboot_unload, 1);
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fail:
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if (file)
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grub_file_close (file);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_free (cmdline);
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grub_free (mbi);
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grub_dl_unref (my_mod);
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}
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}
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void
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grub_module (int argc, char *argv[])
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{
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grub_file_t file = 0;
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grub_ssize_t size, len = 0;
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char *module = 0, *cmdline = 0, *p;
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int i;
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if (argc == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "No module specified");
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goto fail;
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}
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if (!mbi)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT,
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"You need to load the multiboot kernel first");
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goto fail;
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}
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file = grub_gzfile_open (argv[0], 1);
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if (! file)
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goto fail;
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size = grub_file_size (file);
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module = grub_memalign (MULTIBOOT_MOD_ALIGN, size);
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if (! module)
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goto fail;
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if (grub_file_read (file, module, size) != size)
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{
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grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
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goto fail;
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}
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for (i = 0; i < argc; i++)
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len += grub_strlen (argv[i]) + 1;
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cmdline = p = grub_malloc (len);
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if (! cmdline)
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goto fail;
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for (i = 0; i < argc; i++)
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{
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p = grub_stpcpy (p, argv[i]);
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*(p++) = ' ';
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}
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/* Remove the space after the last word. */
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*(--p) = '\0';
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if (mbi->flags & MULTIBOOT_INFO_MODS)
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{
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struct grub_mod_list *modlist = (struct grub_mod_list *) mbi->mods_addr;
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modlist = grub_realloc (modlist, (mbi->mods_count + 1)
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* sizeof (struct grub_mod_list));
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if (! modlist)
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goto fail;
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mbi->mods_addr = (grub_uint32_t) modlist;
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modlist += mbi->mods_count;
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modlist->mod_start = (grub_uint32_t) module;
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modlist->mod_end = (grub_uint32_t) module + size;
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modlist->cmdline = (grub_uint32_t) cmdline;
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modlist->pad = 0;
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mbi->mods_count++;
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}
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else
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{
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struct grub_mod_list *modlist = grub_malloc (sizeof (struct grub_mod_list));
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if (! modlist)
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goto fail;
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modlist->mod_start = (grub_uint32_t) module;
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modlist->mod_end = (grub_uint32_t) module + size;
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modlist->cmdline = (grub_uint32_t) cmdline;
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modlist->pad = 0;
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mbi->mods_count = 1;
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mbi->mods_addr = (grub_uint32_t) modlist;
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mbi->flags |= MULTIBOOT_INFO_MODS;
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}
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fail:
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if (file)
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grub_file_close (file);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_free (module);
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grub_free (cmdline);
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}
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}
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