431 lines
11 KiB
C
431 lines
11 KiB
C
/* linux.c - boot Linux */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2007,2009 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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#include <grub/elf.h>
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#include <grub/elfload.h>
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#include <grub/loader.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/ieee1275/ieee1275.h>
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#include <grub/command.h>
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#include <grub/i18n.h>
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#include <grub/memory.h>
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#include <grub/lib/cmdline.h>
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#include <grub/cache.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#define ELF32_LOADMASK (0xc0000000UL)
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#define ELF64_LOADMASK (0xc000000000000000ULL)
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static grub_dl_t my_mod;
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static int loaded;
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static grub_addr_t initrd_addr;
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static grub_size_t initrd_size;
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static grub_addr_t linux_addr;
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static grub_addr_t linux_entry;
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static grub_size_t linux_size;
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static char *linux_args;
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typedef void (*kernel_entry_t) (void *, unsigned long, int (void *),
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unsigned long, unsigned long);
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/* Context for grub_linux_claimmap_iterate. */
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struct grub_linux_claimmap_iterate_ctx
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{
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grub_addr_t target;
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grub_size_t size;
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grub_size_t align;
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grub_addr_t found_addr;
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};
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/* Helper for grub_linux_claimmap_iterate. */
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static int
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alloc_mem (grub_uint64_t addr, grub_uint64_t len, grub_memory_type_t type,
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void *data)
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{
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struct grub_linux_claimmap_iterate_ctx *ctx = data;
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grub_uint64_t end = addr + len;
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addr = ALIGN_UP (addr, ctx->align);
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ctx->target = ALIGN_UP (ctx->target, ctx->align);
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/* Target above the memory chunk. */
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if (type != GRUB_MEMORY_AVAILABLE || ctx->target > end)
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return 0;
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/* Target inside the memory chunk. */
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if (ctx->target >= addr && ctx->target < end &&
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ctx->size <= end - ctx->target)
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{
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if (grub_claimmap (ctx->target, ctx->size) == GRUB_ERR_NONE)
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{
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ctx->found_addr = ctx->target;
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return 1;
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}
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grub_print_error ();
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}
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/* Target below the memory chunk. */
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if (ctx->target < addr && addr + ctx->size <= end)
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{
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if (grub_claimmap (addr, ctx->size) == GRUB_ERR_NONE)
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{
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ctx->found_addr = addr;
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return 1;
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}
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grub_print_error ();
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}
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return 0;
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}
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static grub_addr_t
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grub_linux_claimmap_iterate (grub_addr_t target, grub_size_t size,
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grub_size_t align)
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{
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struct grub_linux_claimmap_iterate_ctx ctx = {
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.target = target,
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.size = size,
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.align = align,
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.found_addr = (grub_addr_t) -1
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};
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grub_machine_mmap_iterate (alloc_mem, &ctx);
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return ctx.found_addr;
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}
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static grub_err_t
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grub_linux_boot (void)
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{
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kernel_entry_t linuxmain;
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grub_ssize_t actual;
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grub_arch_sync_caches ((void *) linux_addr, linux_size);
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/* Set the command line arguments. */
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grub_ieee1275_set_property (grub_ieee1275_chosen, "bootargs", linux_args,
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grub_strlen (linux_args) + 1, &actual);
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grub_dprintf ("loader", "Entry point: 0x%x\n", linux_entry);
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grub_dprintf ("loader", "Initrd at: 0x%x, size 0x%x\n", initrd_addr,
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initrd_size);
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grub_dprintf ("loader", "Boot arguments: %s\n", linux_args);
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grub_dprintf ("loader", "Jumping to Linux...\n");
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/* Boot the kernel. */
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linuxmain = (kernel_entry_t) linux_entry;
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linuxmain ((void *) initrd_addr, initrd_size, grub_ieee1275_entry_fn, 0, 0);
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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_linux_release_mem (void)
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{
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grub_free (linux_args);
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linux_args = 0;
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if (linux_addr && grub_ieee1275_release (linux_addr, linux_size))
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return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory");
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if (initrd_addr && grub_ieee1275_release (initrd_addr, initrd_size))
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return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory");
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linux_addr = 0;
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initrd_addr = 0;
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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_linux_unload (void)
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{
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grub_err_t err;
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err = grub_linux_release_mem ();
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grub_dl_unref (my_mod);
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loaded = 0;
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return err;
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}
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static grub_err_t
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grub_linux_load32 (grub_elf_t elf, const char *filename)
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{
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Elf32_Addr base_addr;
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grub_addr_t seg_addr;
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grub_uint32_t align;
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grub_uint32_t offset;
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Elf32_Addr entry;
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linux_size = grub_elf32_size (elf, filename, &base_addr, &align);
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if (linux_size == 0)
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return grub_errno;
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/* Pad it; the kernel scribbles over memory beyond its load address. */
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linux_size += 0x100000;
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/* Linux's entry point incorrectly contains a virtual address. */
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entry = elf->ehdr.ehdr32.e_entry & ~ELF32_LOADMASK;
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/* Linux's incorrectly contains a virtual address. */
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base_addr &= ~ELF32_LOADMASK;
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offset = entry - base_addr;
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/* On some systems, firmware occupies the memory we're trying to use.
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* Happily, Linux can be loaded anywhere (it relocates itself). Iterate
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* until we find an open area. */
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seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF32_LOADMASK, linux_size, align);
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if (seg_addr == (grub_addr_t) -1)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory");
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linux_entry = seg_addr + offset;
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linux_addr = seg_addr;
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/* Now load the segments into the area we claimed. */
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auto grub_err_t offset_phdr (Elf32_Phdr *phdr, grub_addr_t *addr, int *do_load);
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grub_err_t offset_phdr (Elf32_Phdr *phdr, grub_addr_t *addr, int *do_load)
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{
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if (phdr->p_type != PT_LOAD)
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{
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*do_load = 0;
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return 0;
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}
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*do_load = 1;
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*addr = (phdr->p_paddr - base_addr) + seg_addr;
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return 0;
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}
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return grub_elf32_load (elf, filename, offset_phdr, 0, 0);
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}
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static grub_err_t
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grub_linux_load64 (grub_elf_t elf, const char *filename)
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{
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Elf64_Addr base_addr;
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grub_addr_t seg_addr;
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grub_uint64_t align;
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grub_uint64_t offset;
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Elf64_Addr entry;
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linux_size = grub_elf64_size (elf, filename, &base_addr, &align);
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if (linux_size == 0)
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return grub_errno;
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/* Pad it; the kernel scribbles over memory beyond its load address. */
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linux_size += 0x100000;
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base_addr &= ~ELF64_LOADMASK;
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entry = elf->ehdr.ehdr64.e_entry & ~ELF64_LOADMASK;
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offset = entry - base_addr;
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/* Linux's incorrectly contains a virtual address. */
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/* On some systems, firmware occupies the memory we're trying to use.
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* Happily, Linux can be loaded anywhere (it relocates itself). Iterate
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* until we find an open area. */
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seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF64_LOADMASK, linux_size, align);
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if (seg_addr == (grub_addr_t) -1)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory");
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linux_entry = seg_addr + offset;
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linux_addr = seg_addr;
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/* Now load the segments into the area we claimed. */
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auto grub_err_t offset_phdr (Elf64_Phdr *phdr, grub_addr_t *addr, int *do_load);
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grub_err_t offset_phdr (Elf64_Phdr *phdr, grub_addr_t *addr, int *do_load)
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{
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if (phdr->p_type != PT_LOAD)
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{
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*do_load = 0;
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return 0;
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}
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*do_load = 1;
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*addr = (phdr->p_paddr - base_addr) + seg_addr;
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return 0;
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}
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return grub_elf64_load (elf, filename, offset_phdr, 0, 0);
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}
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static grub_err_t
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grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_elf_t elf = 0;
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int size;
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grub_dl_ref (my_mod);
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if (argc == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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goto out;
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}
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elf = grub_elf_open (argv[0]);
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if (! elf)
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goto out;
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if (elf->ehdr.ehdr32.e_type != ET_EXEC && elf->ehdr.ehdr32.e_type != ET_DYN)
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{
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grub_error (GRUB_ERR_UNKNOWN_OS,
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N_("this ELF file is not of the right type"));
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goto out;
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}
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/* Release the previously used memory. */
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grub_loader_unset ();
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if (grub_elf_is_elf32 (elf))
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grub_linux_load32 (elf, argv[0]);
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else
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if (grub_elf_is_elf64 (elf))
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grub_linux_load64 (elf, argv[0]);
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else
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{
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grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("invalid arch-dependent ELF magic"));
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goto out;
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}
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size = grub_loader_cmdline_size(argc, argv);
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linux_args = grub_malloc (size + sizeof (LINUX_IMAGE));
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if (! linux_args)
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goto out;
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/* Create kernel command line. */
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grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
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grub_create_loader_cmdline (argc, argv, linux_args + sizeof (LINUX_IMAGE) - 1,
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size);
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out:
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if (elf)
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grub_elf_close (elf);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_linux_release_mem ();
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grub_dl_unref (my_mod);
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loaded = 0;
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}
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else
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{
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grub_loader_set (grub_linux_boot, grub_linux_unload, 1);
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initrd_addr = 0;
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loaded = 1;
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}
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return grub_errno;
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}
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static grub_err_t
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grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t *files = 0;
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grub_size_t size = 0;
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grub_addr_t first_addr;
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grub_addr_t addr;
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int i;
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int nfiles = 0;
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grub_uint8_t *ptr;
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if (argc == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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goto fail;
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}
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if (!loaded)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first"));
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goto fail;
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}
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files = grub_zalloc (argc * sizeof (files[0]));
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if (!files)
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goto fail;
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for (i = 0; i < argc; i++)
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{
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grub_file_filter_disable_compression ();
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files[i] = grub_file_open (argv[i]);
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if (! files[i])
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goto fail;
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nfiles++;
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size += ALIGN_UP (grub_file_size (files[i]), 4);
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}
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first_addr = linux_addr + linux_size;
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/* Attempt to claim at a series of addresses until successful in
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the same way that grub_rescue_cmd_linux does. */
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addr = grub_linux_claimmap_iterate (first_addr, size, 0x100000);
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if (addr == (grub_addr_t) -1)
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goto fail;
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grub_dprintf ("loader", "Loading initrd at 0x%x, size 0x%x\n", addr, size);
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ptr = (void *) addr;
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for (i = 0; i < nfiles; i++)
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{
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grub_ssize_t cursize = grub_file_size (files[i]);
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if (grub_file_read (files[i], ptr, cursize) != cursize)
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{
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grub_ieee1275_release (addr, size);
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if (!grub_errno)
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grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
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argv[i]);
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goto fail;
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}
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ptr += cursize;
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grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4));
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ptr += ALIGN_UP_OVERHEAD (cursize, 4);
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}
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initrd_addr = addr;
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initrd_size = size;
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fail:
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for (i = 0; i < nfiles; i++)
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grub_file_close (files[i]);
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grub_free (files);
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return grub_errno;
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}
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static grub_command_t cmd_linux, cmd_initrd;
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GRUB_MOD_INIT(linux)
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{
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cmd_linux = grub_register_command ("linux", grub_cmd_linux,
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0, N_("Load Linux."));
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cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
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0, N_("Load initrd."));
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my_mod = mod;
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}
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GRUB_MOD_FINI(linux)
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{
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grub_unregister_command (cmd_linux);
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grub_unregister_command (cmd_initrd);
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}
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