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.
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* multiboot2.c - boot a multiboot 2 OS image. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 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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#include <multiboot2.h>
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#include <grub/multiboot2.h>
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#include <grub/elf.h>
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#include <grub/err.h>
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#include <grub/machine/loader.h>
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#include <grub/mm.h>
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grub_err_t
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grub_mb2_arch_elf32_hook (Elf32_Phdr *phdr, UNUSED grub_addr_t *addr)
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{
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Elf32_Addr paddr = phdr->p_paddr;
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if ((paddr < grub_os_area_addr)
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|| (paddr + phdr->p_memsz > grub_os_area_addr + grub_os_area_size))
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return grub_error(GRUB_ERR_OUT_OF_RANGE,"Address 0x%x is out of range",
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paddr);
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_mb2_arch_elf64_hook (Elf64_Phdr *phdr, UNUSED grub_addr_t *addr)
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{
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Elf64_Addr paddr = phdr->p_paddr;
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if ((paddr < grub_os_area_addr)
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|| (paddr + phdr->p_memsz > grub_os_area_addr + grub_os_area_size))
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return (GRUB_ERR_OUT_OF_RANGE,"Address 0x%x is out of range",
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paddr);
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_mb2_arch_module_alloc (grub_size_t size, grub_addr_t *addr)
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{
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grub_addr_t modaddr;
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modaddr = grub_memalign (MULTIBOOT2_MOD_ALIGN, size);
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if (! modaddr)
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return grub_errno;
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*addr = modaddr;
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_mb2_arch_module_free (grub_addr_t addr, UNUSED grub_size_t size)
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{
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grub_free((void *) addr);
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return GRUB_ERR_NONE;
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}
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void
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grub_mb2_arch_boot (grub_addr_t entry, void *tags)
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{
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grub_multiboot2_real_boot (entry, tags);
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}
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void
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grub_mb2_arch_unload (struct multiboot_tag_header *tags)
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{
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struct multiboot_tag_header *tag;
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/* Free all module memory in the tag list. */
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for_each_tag (tag, tags)
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{
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if (tag->key == MULTIBOOT2_TAG_MODULE)
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{
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struct multiboot_tag_module *module =
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(struct multiboot_tag_module *) tag;
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grub_free((void *) module->addr);
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}
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}
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}
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grub_err_t
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grub_mb2_tags_arch_create (void)
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{
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/* XXX Create boot device et al. */
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return GRUB_ERR_NONE;
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}
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