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.
119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/* multiboot.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/loader.h>
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#include <grub/ieee1275/ieee1275.h>
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#include <grub/multiboot2.h>
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#include <grub/err.h>
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#include <grub/elf.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/machine/kernel.h>
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typedef void (*kernel_entry_t) (unsigned long, void *, int (void *),
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unsigned long, unsigned long);
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/* Claim the memory occupied by the multiboot kernel. */
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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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int rc;
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rc = grub_claimmap (phdr->p_paddr, phdr->p_memsz);
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if (rc)
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return grub_error(GRUB_ERR_OUT_OF_MEMORY, "Couldn't claim %x - %x",
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phdr->p_paddr, phdr->p_paddr + phdr->p_memsz);
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grub_dprintf ("loader", "Loading segment at 0x%x - 0x%x\n", phdr->p_paddr,
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phdr->p_paddr + phdr->p_memsz);
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return GRUB_ERR_NONE;
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}
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/* Claim the memory occupied by the multiboot kernel. */
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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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int rc;
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rc = grub_claimmap (phdr->p_paddr, phdr->p_memsz);
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if (rc)
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return grub_error(GRUB_ERR_OUT_OF_MEMORY, "Couldn't claim 0x%lx - 0x%lx",
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phdr->p_paddr, phdr->p_paddr + phdr->p_memsz);
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grub_dprintf ("loader", "Loading segment at 0x%lx - 0x%lx\n",
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(unsigned long) phdr->p_paddr,
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(unsigned long) (phdr->p_paddr + phdr->p_memsz));
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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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int rc;
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/* XXX Will need to map on some firmwares. */
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rc = grub_ieee1275_claim (0, size, MULTIBOOT2_MOD_ALIGN, addr);
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if (rc)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"Firmware couldn't allocate memory (size 0x%lx)", size);
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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, grub_size_t size)
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{
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grub_ieee1275_release (addr, size);
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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_tags_arch_create (void)
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{
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/* Nothing special. */
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return GRUB_ERR_NONE;
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}
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/* Release the memory we claimed from Open Firmware above. */
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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_ieee1275_release (module->addr, module->size);
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}
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}
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}
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void
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grub_mb2_arch_boot (grub_addr_t entry_addr, void *tags)
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{
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kernel_entry_t entry = (kernel_entry_t) entry_addr;
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entry (MULTIBOOT2_BOOTLOADER_MAGIC, tags, grub_ieee1275_entry_fn, 0, 0);
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}
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