e5dfe7775a
for powerpc & i386-pc. This patch was more so started by Hollis Blanchard getting multiboot 2 working for powerpc and I added to it and cleaned it up. One of the ideas with this patch is to keep everything under one command for the user. So instead of having a "multiboot2" & "module2" command, I created a proxy like mechanism so that you have only one command for both multiboot 1 & 2 ... "multiboot". This is where "loader/multiboot_loader.c" comes from. I could have integrated things more but I figure the current approach will less likely break anything. So if your OS is multiboot 2 capable, the user would do the following to load it up from a grub prompt: grub> multiboot <location of kernel> <kernel args> grub> module <some image> <multiboot tag> <image arguments> grub> module <isome mage> <multiboot tag> <image arguments> grub ..... The other thing that this patch does is it begins to make the multiboot 1 code a bit more architecture agnostic so IF someone wanted to implement it on another architecture they can. A bit of file moving around and definition renaming is also apart of this patch. I have also taken the time to make sure that it does not break multiboot 1 loading on i386-pc. But mulitboot 2 may still need a little more testing and work for i386-pc. Powerpc multiboot 2 has been heavily tested and does work.
434 lines
12 KiB
C
434 lines
12 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) 2003,2004,2005,2007 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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* - a.out support
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* - boot device
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* - symbol table
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* - memory map
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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/elf.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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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 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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/* 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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Elf32_Phdr *phdr;
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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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entry = ehdr->e_entry;
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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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phdr = (Elf32_Phdr *) ((char *) buffer + ehdr->e_phoff
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+ i * ehdr->e_phentsize);
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if (phdr->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->p_paddr < grub_os_area_addr)
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|| (phdr->p_paddr + phdr->p_memsz
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> grub_os_area_addr + 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");
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if (grub_file_seek (file, (grub_off_t) phdr->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 *) phdr->p_paddr, phdr->p_filesz)
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!= (grub_ssize_t) phdr->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->p_filesz < phdr->p_memsz)
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grub_memset ((char *) phdr->p_paddr + phdr->p_filesz, 0,
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phdr->p_memsz - phdr->p_filesz);
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}
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}
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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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Elf64_Phdr *phdr;
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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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/* 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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phdr = (Elf64_Phdr *) ((char *) buffer + ehdr->e_phoff
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+ i * ehdr->e_phentsize);
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if (phdr->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->p_paddr < (grub_uint64_t) grub_os_area_addr)
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|| (phdr->p_paddr + phdr->p_memsz
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> ((grub_uint64_t) grub_os_area_addr
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+ (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");
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if (grub_file_seek (file, (grub_off_t) phdr->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->p_paddr),
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phdr->p_filesz)
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!= (grub_ssize_t) phdr->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->p_filesz < phdr->p_memsz)
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grub_memset (((char *) ((grub_uint32_t) phdr->p_paddr)
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+ phdr->p_filesz),
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0,
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phdr->p_memsz - phdr->p_filesz);
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}
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}
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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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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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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 (grub_multiboot_load_elf (file, buffer) != GRUB_ERR_NONE)
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goto fail;
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mbi = grub_malloc (sizeof (struct grub_multiboot_info));
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if (! mbi)
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goto fail;
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mbi->flags = MULTIBOOT_INFO_MEMORY;
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/* Convert from bytes to kilobytes. */
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mbi->mem_lower = grub_lower_mem / 1024;
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mbi->mem_upper = grub_upper_mem / 1024;
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for (i = 0, len = 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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mbi->flags |= MULTIBOOT_INFO_CMDLINE;
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mbi->cmdline = (grub_uint32_t) cmdline;
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mbi->flags |= MULTIBOOT_INFO_BOOT_LOADER_NAME;
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mbi->boot_loader_name = (grub_uint32_t) grub_strdup (PACKAGE_STRING);
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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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