2009-02-27 Robert Millan <rmh@aybabtu.com>
* loader/i386/pc/multiboot.c: Move from here ...
* loader/i386/multiboot.c: ... to here. Update all users.
This commit is contained in:
robertmh
parent
b941342428
commit
4b6bf4f97c
7 changed files with 46 additions and 39 deletions
629
loader/i386/multiboot.c
Normal file
629
loader/i386/multiboot.c
Normal file
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@ -0,0 +1,629 @@
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/* 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/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/rescue.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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extern grub_dl_t my_mod;
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static struct grub_multiboot_info *mbi;
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static grub_addr_t entry;
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static char *playground = NULL;
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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);
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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_machine_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_machine_mmap_iterate (hook);
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}
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/* Check if BUFFER contains ELF32. */
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static int
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grub_multiboot_is_elf32 (void *buffer)
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{
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Elf32_Ehdr *ehdr = (Elf32_Ehdr *) buffer;
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return ehdr->e_ident[EI_CLASS] == ELFCLASS32;
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}
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static grub_err_t
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grub_multiboot_load_elf32 (grub_file_t file, void *buffer)
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{
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Elf32_Ehdr *ehdr = (Elf32_Ehdr *) buffer;
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char *phdr_base;
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int lowest_segment = 0, highest_segment = 0;
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int i;
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if (ehdr->e_ident[EI_CLASS] != ELFCLASS32)
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return grub_error (GRUB_ERR_UNKNOWN_OS, "invalid ELF class");
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if (grub_dl_check_header (ehdr, sizeof(Elf32_Ehdr)))
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return grub_error (GRUB_ERR_UNKNOWN_OS, "no valid ELF header found");
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if (ehdr->e_type != ET_EXEC)
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return grub_error (GRUB_ERR_UNKNOWN_OS, "invalid ELF file type");
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/* FIXME: Should we support program headers at strange locations? */
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if (ehdr->e_phoff + ehdr->e_phnum * ehdr->e_phentsize > MULTIBOOT_SEARCH)
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return grub_error (GRUB_ERR_BAD_OS, "program header at a too high offset");
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phdr_base = (char *) buffer + ehdr->e_phoff;
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#define phdr(i) ((Elf32_Phdr *) (phdr_base + (i) * ehdr->e_phentsize))
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for (i = 0; i < ehdr->e_phnum; i++)
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if (phdr(i)->p_type == PT_LOAD && phdr(i)->p_filesz != 0)
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{
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if (phdr(i)->p_paddr < phdr(lowest_segment)->p_paddr)
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lowest_segment = i;
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if (phdr(i)->p_paddr > phdr(highest_segment)->p_paddr)
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highest_segment = i;
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}
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grub_multiboot_payload_size += (phdr(highest_segment)->p_paddr + phdr(highest_segment)->p_memsz) - phdr(lowest_segment)->p_paddr;
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grub_multiboot_payload_dest = phdr(lowest_segment)->p_paddr;
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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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return grub_errno;
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grub_multiboot_payload_orig = (long) playground + RELOCATOR_SIZEOF(forward);
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/* Load every loadable segment in memory. */
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for (i = 0; i < ehdr->e_phnum; i++)
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{
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if (phdr(i)->p_type == PT_LOAD && phdr(i)->p_filesz != 0)
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{
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char *load_this_module_at = (char *) (grub_multiboot_payload_orig + (phdr(i)->p_paddr - phdr(lowest_segment)->p_paddr));
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grub_dprintf ("multiboot_loader", "segment %d: paddr=%p, memsz=0x%x\n",
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i, (void *) phdr(i)->p_paddr, phdr(i)->p_memsz);
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if (grub_file_seek (file, (grub_off_t) phdr(i)->p_offset)
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== (grub_off_t) -1)
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return grub_error (GRUB_ERR_BAD_OS,
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"invalid offset in program header");
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if (grub_file_read (file, load_this_module_at, phdr(i)->p_filesz)
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!= (grub_ssize_t) phdr(i)->p_filesz)
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return grub_error (GRUB_ERR_BAD_OS,
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"couldn't read segment from file");
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if (phdr(i)->p_filesz < phdr(i)->p_memsz)
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grub_memset (load_this_module_at + phdr(i)->p_filesz, 0,
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phdr(i)->p_memsz - phdr(i)->p_filesz);
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}
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}
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grub_multiboot_payload_entry_offset = ehdr->e_entry - phdr(lowest_segment)->p_vaddr;
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#undef phdr
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return grub_errno;
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}
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/* Check if BUFFER contains ELF64. */
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static int
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grub_multiboot_is_elf64 (void *buffer)
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{
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Elf64_Ehdr *ehdr = (Elf64_Ehdr *) buffer;
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return ehdr->e_ident[EI_CLASS] == ELFCLASS64;
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}
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static grub_err_t
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grub_multiboot_load_elf64 (grub_file_t file, void *buffer)
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{
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Elf64_Ehdr *ehdr = (Elf64_Ehdr *) buffer;
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char *phdr_base;
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grub_addr_t physical_entry_addr = 0;
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int i;
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if (ehdr->e_ident[EI_CLASS] != ELFCLASS64)
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return grub_error (GRUB_ERR_UNKNOWN_OS, "invalid ELF class");
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if (ehdr->e_ident[EI_MAG0] != ELFMAG0
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|| ehdr->e_ident[EI_MAG1] != ELFMAG1
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|| ehdr->e_ident[EI_MAG2] != ELFMAG2
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|| ehdr->e_ident[EI_MAG3] != ELFMAG3
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|| ehdr->e_version != EV_CURRENT
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|| ehdr->e_ident[EI_DATA] != ELFDATA2LSB
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|| ehdr->e_machine != EM_X86_64)
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return grub_error(GRUB_ERR_UNKNOWN_OS, "no valid ELF header found");
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if (ehdr->e_type != ET_EXEC)
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return grub_error (GRUB_ERR_UNKNOWN_OS, "invalid ELF file type");
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/* FIXME: Should we support program headers at strange locations? */
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if (ehdr->e_phoff + ehdr->e_phnum * ehdr->e_phentsize > MULTIBOOT_SEARCH)
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return grub_error (GRUB_ERR_BAD_OS, "program header at a too high offset");
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/* We still in 32-bit mode */
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if (ehdr->e_entry > 0xffffffff)
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return grub_error (GRUB_ERR_BAD_OS, "invalid entry point for ELF64");
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entry = ehdr->e_entry;
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phdr_base = (char *) buffer + ehdr->e_phoff;
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#define phdr(i) ((Elf64_Phdr *) (phdr_base + (i) * ehdr->e_phentsize))
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/* Load every loadable segment in memory. */
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for (i = 0; i < ehdr->e_phnum; i++)
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{
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if (phdr(i)->p_type == PT_LOAD)
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{
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/* The segment should fit in the area reserved for the OS. */
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if (phdr(i)->p_paddr < (grub_uint64_t) grub_os_area_addr)
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return grub_error (GRUB_ERR_BAD_OS,
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"segment doesn't fit in memory reserved for the OS (0x%lx < 0x%lx)",
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phdr(i)->p_paddr, (grub_uint64_t) grub_os_area_addr);
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if (phdr(i)->p_paddr + phdr(i)->p_memsz
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> (grub_uint64_t) grub_os_area_addr + (grub_uint64_t) grub_os_area_size)
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return grub_error (GRUB_ERR_BAD_OS,
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"segment doesn't fit in memory reserved for the OS (0x%lx > 0x%lx)",
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phdr(i)->p_paddr + phdr(i)->p_memsz,
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(grub_uint64_t) grub_os_area_addr + (grub_uint64_t) grub_os_area_size);
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if (grub_file_seek (file, (grub_off_t) phdr(i)->p_offset)
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== (grub_off_t) -1)
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return grub_error (GRUB_ERR_BAD_OS,
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"invalid offset in program header");
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if (grub_file_read (file, (void *) ((grub_uint32_t) phdr(i)->p_paddr),
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phdr(i)->p_filesz)
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!= (grub_ssize_t) phdr(i)->p_filesz)
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return grub_error (GRUB_ERR_BAD_OS,
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"couldn't read segment from file");
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if (phdr(i)->p_filesz < phdr(i)->p_memsz)
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grub_memset (((char *) ((grub_uint32_t) phdr(i)->p_paddr)
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+ phdr(i)->p_filesz),
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0,
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phdr(i)->p_memsz - phdr(i)->p_filesz);
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if ((entry >= phdr(i)->p_vaddr) &&
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(entry < phdr(i)->p_vaddr + phdr(i)->p_memsz))
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physical_entry_addr = entry + phdr(i)->p_paddr - phdr(i)->p_vaddr;
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}
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}
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#undef phdr
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if (physical_entry_addr)
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entry = physical_entry_addr;
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return grub_errno;
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}
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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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char *p;
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p = grub_env_get ("root");
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if ((p) && ((p[0] == 'h') || (p[0] == 'f')) && (p[1] == 'd') &&
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(p[2] >= '0') && (p[2] <= '9'))
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{
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grub_uint32_t bd;
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bd = (p[0] == 'h') ? 0x80 : 0;
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bd += grub_strtoul (p + 2, &p, 0);
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bd <<= 24;
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if ((p) && (p[0] == ','))
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{
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if ((p[1] >= '0') && (p[1] <= '9'))
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{
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bd += ((grub_strtoul (p + 1, &p, 0) - 1) & 0xFF) << 16;
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if ((p) && (p[0] == ','))
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p++;
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}
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else
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bd += 0xFF0000;
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if ((p[0] >= 'a') && (p[0] <= 'z'))
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bd += (p[0] - 'a') << 8;
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else
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bd += 0xFF00;
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}
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else
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bd += 0xFFFF00;
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bd += 0xFF;
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*bootdev = bd;
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return 1;
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}
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return 0;
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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;
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grub_uint32_t mmap_length;
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int i;
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|
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grub_loader_unset ();
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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mmap_length = grub_get_multiboot_mmap_len ();
|
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|
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grub_multiboot_payload_size = sizeof (struct grub_multiboot_info) + mmap_length + MULTIBOOT_INFO_ALIGN;
|
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|
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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);
|
||||
|
||||
if (header->bss_end_addr)
|
||||
grub_multiboot_payload_size += (header->bss_end_addr - header->load_addr);
|
||||
else
|
||||
grub_multiboot_payload_size += load_size;
|
||||
grub_multiboot_payload_dest = header->load_addr;
|
||||
|
||||
playground = grub_malloc (RELOCATOR_SIZEOF(forward) + grub_multiboot_payload_size + RELOCATOR_SIZEOF(backward));
|
||||
if (! playground)
|
||||
goto fail;
|
||||
|
||||
grub_multiboot_payload_orig = (long) playground + RELOCATOR_SIZEOF(forward);
|
||||
|
||||
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_entry_offset = header->entry_addr - header->load_addr;
|
||||
|
||||
}
|
||||
else if (grub_multiboot_load_elf (file, buffer) != GRUB_ERR_NONE)
|
||||
goto fail;
|
||||
|
||||
grub_multiboot_payload_size = ALIGN_UP (grub_multiboot_payload_size, MULTIBOOT_INFO_ALIGN);
|
||||
|
||||
mbi = grub_multiboot_payload_orig + grub_multiboot_payload_size - mmap_length - sizeof (struct grub_multiboot_info);
|
||||
grub_memset (mbi, 0, sizeof (struct grub_multiboot_info));
|
||||
mbi->mmap_length = mmap_length;
|
||||
|
||||
grub_fill_multiboot_mmap ((struct grub_multiboot_mmap_entry *) (grub_multiboot_payload_orig
|
||||
+ grub_multiboot_payload_size
|
||||
- mbi->mmap_length));
|
||||
|
||||
/* FIXME: grub_uint32_t will break for addresses above 4 GiB, but is mandated
|
||||
by the spec. Is there something we can do about it? */
|
||||
mbi->mmap_addr = grub_multiboot_payload_dest + grub_multiboot_payload_size - mbi->mmap_length;
|
||||
mbi->flags |= MULTIBOOT_INFO_MEM_MAP;
|
||||
|
||||
if (grub_multiboot_payload_dest >= grub_multiboot_payload_orig)
|
||||
{
|
||||
grub_memmove (playground, &grub_multiboot_forward_relocator, RELOCATOR_SIZEOF(forward));
|
||||
entry = (grub_addr_t) playground;
|
||||
}
|
||||
else
|
||||
{
|
||||
grub_memmove ((char *) (grub_multiboot_payload_orig + grub_multiboot_payload_size),
|
||||
&grub_multiboot_backward_relocator, RELOCATOR_SIZEOF(backward));
|
||||
entry = (grub_addr_t) grub_multiboot_payload_orig + grub_multiboot_payload_size;
|
||||
}
|
||||
|
||||
grub_dprintf ("multiboot_loader", "dest=%p, size=0x%x, entry_offset=0x%x\n",
|
||||
(void *) grub_multiboot_payload_dest,
|
||||
grub_multiboot_payload_size,
|
||||
grub_multiboot_payload_entry_offset);
|
||||
|
||||
/* Convert from bytes to kilobytes. */
|
||||
mbi->mem_lower = grub_lower_mem / 1024;
|
||||
mbi->mem_upper = grub_upper_mem / 1024;
|
||||
mbi->flags |= MULTIBOOT_INFO_MEMORY;
|
||||
|
||||
for (i = 0, len = 0; i < argc; i++)
|
||||
len += grub_strlen (argv[i]) + 1;
|
||||
|
||||
cmdline = p = grub_malloc (len);
|
||||
if (! cmdline)
|
||||
goto fail;
|
||||
|
||||
for (i = 0; i < argc; i++)
|
||||
{
|
||||
p = grub_stpcpy (p, argv[i]);
|
||||
*(p++) = ' ';
|
||||
}
|
||||
|
||||
/* Remove the space after the last word. */
|
||||
*(--p) = '\0';
|
||||
|
||||
mbi->flags |= MULTIBOOT_INFO_CMDLINE;
|
||||
mbi->cmdline = (grub_uint32_t) cmdline;
|
||||
|
||||
mbi->flags |= MULTIBOOT_INFO_BOOT_LOADER_NAME;
|
||||
mbi->boot_loader_name = (grub_uint32_t) grub_strdup (PACKAGE_STRING);
|
||||
|
||||
if (grub_multiboot_get_bootdev (&mbi->boot_device))
|
||||
mbi->flags |= MULTIBOOT_INFO_BOOTDEV;
|
||||
|
||||
grub_loader_set (grub_multiboot_boot, grub_multiboot_unload, 1);
|
||||
|
||||
fail:
|
||||
if (file)
|
||||
grub_file_close (file);
|
||||
|
||||
if (grub_errno != GRUB_ERR_NONE)
|
||||
{
|
||||
grub_free (cmdline);
|
||||
grub_free (mbi);
|
||||
grub_dl_unref (my_mod);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
grub_module (int argc, char *argv[])
|
||||
{
|
||||
grub_file_t file = 0;
|
||||
grub_ssize_t size, len = 0;
|
||||
char *module = 0, *cmdline = 0, *p;
|
||||
int i;
|
||||
|
||||
if (argc == 0)
|
||||
{
|
||||
grub_error (GRUB_ERR_BAD_ARGUMENT, "No module specified");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
if (!mbi)
|
||||
{
|
||||
grub_error (GRUB_ERR_BAD_ARGUMENT,
|
||||
"You need to load the multiboot kernel first");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
file = grub_gzfile_open (argv[0], 1);
|
||||
if (! file)
|
||||
goto fail;
|
||||
|
||||
size = grub_file_size (file);
|
||||
module = grub_memalign (MULTIBOOT_MOD_ALIGN, size);
|
||||
if (! module)
|
||||
goto fail;
|
||||
|
||||
if (grub_file_read (file, module, size) != size)
|
||||
{
|
||||
grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
for (i = 0; i < argc; i++)
|
||||
len += grub_strlen (argv[i]) + 1;
|
||||
|
||||
cmdline = p = grub_malloc (len);
|
||||
if (! cmdline)
|
||||
goto fail;
|
||||
|
||||
for (i = 0; i < argc; i++)
|
||||
{
|
||||
p = grub_stpcpy (p, argv[i]);
|
||||
*(p++) = ' ';
|
||||
}
|
||||
|
||||
/* Remove the space after the last word. */
|
||||
*(--p) = '\0';
|
||||
|
||||
if (mbi->flags & MULTIBOOT_INFO_MODS)
|
||||
{
|
||||
struct grub_mod_list *modlist = (struct grub_mod_list *) mbi->mods_addr;
|
||||
|
||||
modlist = grub_realloc (modlist, (mbi->mods_count + 1)
|
||||
* sizeof (struct grub_mod_list));
|
||||
if (! modlist)
|
||||
goto fail;
|
||||
mbi->mods_addr = (grub_uint32_t) modlist;
|
||||
modlist += mbi->mods_count;
|
||||
modlist->mod_start = (grub_uint32_t) module;
|
||||
modlist->mod_end = (grub_uint32_t) module + size;
|
||||
modlist->cmdline = (grub_uint32_t) cmdline;
|
||||
modlist->pad = 0;
|
||||
mbi->mods_count++;
|
||||
}
|
||||
else
|
||||
{
|
||||
struct grub_mod_list *modlist = grub_malloc (sizeof (struct grub_mod_list));
|
||||
if (! modlist)
|
||||
goto fail;
|
||||
modlist->mod_start = (grub_uint32_t) module;
|
||||
modlist->mod_end = (grub_uint32_t) module + size;
|
||||
modlist->cmdline = (grub_uint32_t) cmdline;
|
||||
modlist->pad = 0;
|
||||
mbi->mods_count = 1;
|
||||
mbi->mods_addr = (grub_uint32_t) modlist;
|
||||
mbi->flags |= MULTIBOOT_INFO_MODS;
|
||||
}
|
||||
|
||||
fail:
|
||||
if (file)
|
||||
grub_file_close (file);
|
||||
|
||||
if (grub_errno != GRUB_ERR_NONE)
|
||||
{
|
||||
grub_free (module);
|
||||
grub_free (cmdline);
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue