2N/A/* linux.c - boot Linux */
2N/A/*
2N/A * GRUB -- GRand Unified Bootloader
2N/A * Copyright (C) 2003,2004,2005,2007,2009 Free Software Foundation, Inc.
2N/A *
2N/A * GRUB is free software: you can redistribute it and/or modify
2N/A * it under the terms of the GNU General Public License as published by
2N/A * the Free Software Foundation, either version 3 of the License, or
2N/A * (at your option) any later version.
2N/A *
2N/A * GRUB is distributed in the hope that it will be useful,
2N/A * but WITHOUT ANY WARRANTY; without even the implied warranty of
2N/A * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2N/A * GNU General Public License for more details.
2N/A *
2N/A * You should have received a copy of the GNU General Public License
2N/A * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
2N/A */
2N/A
2N/A#include <grub/elf.h>
2N/A#include <grub/elfload.h>
2N/A#include <grub/loader.h>
2N/A#include <grub/dl.h>
2N/A#include <grub/mm.h>
2N/A#include <grub/misc.h>
2N/A#include <grub/ieee1275/ieee1275.h>
2N/A#include <grub/command.h>
2N/A#include <grub/i18n.h>
2N/A#include <grub/memory.h>
2N/A#include <grub/lib/cmdline.h>
2N/A
2N/AGRUB_MOD_LICENSE ("GPLv3+");
2N/A
2N/A#define ELF32_LOADMASK (0xc0000000UL)
2N/A#define ELF64_LOADMASK (0xc000000000000000ULL)
2N/A
2N/Astatic grub_dl_t my_mod;
2N/A
2N/Astatic int loaded;
2N/A
2N/Astatic grub_addr_t initrd_addr;
2N/Astatic grub_size_t initrd_size;
2N/A
2N/Astatic grub_addr_t linux_addr;
2N/Astatic grub_size_t linux_size;
2N/A
2N/Astatic char *linux_args;
2N/A
2N/Atypedef void (*kernel_entry_t) (void *, unsigned long, int (void *),
2N/A unsigned long, unsigned long);
2N/A
2N/Astatic grub_addr_t
2N/Agrub_linux_claimmap_iterate (grub_addr_t target, grub_size_t size,
2N/A grub_size_t align)
2N/A{
2N/A grub_addr_t found_addr = (grub_addr_t) -1;
2N/A
2N/A auto int NESTED_FUNC_ATTR alloc_mem (grub_uint64_t addr, grub_uint64_t len,
2N/A grub_memory_type_t type);
2N/A int NESTED_FUNC_ATTR alloc_mem (grub_uint64_t addr, grub_uint64_t len,
2N/A grub_memory_type_t type)
2N/A {
2N/A grub_uint64_t end = addr + len;
2N/A addr = ALIGN_UP (addr, align);
2N/A target = ALIGN_UP (target, align);
2N/A
2N/A /* Target above the memory chunk. */
2N/A if (type != GRUB_MEMORY_AVAILABLE || target > end)
2N/A return 0;
2N/A
2N/A /* Target inside the memory chunk. */
2N/A if (target >= addr && target < end && size <= end - target)
2N/A {
2N/A if (grub_claimmap (target, size) == GRUB_ERR_NONE)
2N/A {
2N/A found_addr = target;
2N/A return 1;
2N/A }
2N/A }
2N/A /* Target below the memory chunk. */
2N/A if (target < addr && addr + size <= end)
2N/A {
2N/A if (grub_claimmap (addr, size) == GRUB_ERR_NONE)
2N/A {
2N/A found_addr = addr;
2N/A return 1;
2N/A }
2N/A }
2N/A return 0;
2N/A }
2N/A
2N/A grub_machine_mmap_iterate (alloc_mem);
2N/A
2N/A return found_addr;
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_linux_boot (void)
2N/A{
2N/A kernel_entry_t linuxmain;
2N/A grub_ssize_t actual;
2N/A
2N/A /* Set the command line arguments. */
2N/A grub_ieee1275_set_property (grub_ieee1275_chosen, "bootargs", linux_args,
2N/A grub_strlen (linux_args) + 1, &actual);
2N/A
2N/A grub_dprintf ("loader", "Entry point: 0x%x\n", linux_addr);
2N/A grub_dprintf ("loader", "Initrd at: 0x%x, size 0x%x\n", initrd_addr,
2N/A initrd_size);
2N/A grub_dprintf ("loader", "Boot arguments: %s\n", linux_args);
2N/A grub_dprintf ("loader", "Jumping to Linux...\n");
2N/A
2N/A /* Boot the kernel. */
2N/A linuxmain = (kernel_entry_t) linux_addr;
2N/A linuxmain ((void *) initrd_addr, initrd_size, grub_ieee1275_entry_fn, 0, 0);
2N/A
2N/A return GRUB_ERR_NONE;
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_linux_release_mem (void)
2N/A{
2N/A grub_free (linux_args);
2N/A linux_args = 0;
2N/A
2N/A if (linux_addr && grub_ieee1275_release (linux_addr, linux_size))
2N/A return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory");
2N/A
2N/A if (initrd_addr && grub_ieee1275_release (initrd_addr, initrd_size))
2N/A return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory");
2N/A
2N/A linux_addr = 0;
2N/A initrd_addr = 0;
2N/A
2N/A return GRUB_ERR_NONE;
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_linux_unload (void)
2N/A{
2N/A grub_err_t err;
2N/A
2N/A err = grub_linux_release_mem ();
2N/A grub_dl_unref (my_mod);
2N/A
2N/A loaded = 0;
2N/A
2N/A return err;
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_linux_load32 (grub_elf_t elf)
2N/A{
2N/A Elf32_Addr base_addr;
2N/A grub_addr_t seg_addr;
2N/A grub_uint32_t align;
2N/A grub_uint32_t offset;
2N/A Elf32_Addr entry;
2N/A
2N/A linux_size = grub_elf32_size (elf, &base_addr, &align);
2N/A if (linux_size == 0)
2N/A return grub_errno;
2N/A /* Pad it; the kernel scribbles over memory beyond its load address. */
2N/A linux_size += 0x100000;
2N/A
2N/A /* Linux's entry point incorrectly contains a virtual address. */
2N/A entry = elf->ehdr.ehdr32.e_entry & ~ELF32_LOADMASK;
2N/A
2N/A /* Linux's incorrectly contains a virtual address. */
2N/A base_addr &= ~ELF32_LOADMASK;
2N/A offset = entry - base_addr;
2N/A
2N/A /* On some systems, firmware occupies the memory we're trying to use.
2N/A * Happily, Linux can be loaded anywhere (it relocates itself). Iterate
2N/A * until we find an open area. */
2N/A seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF32_LOADMASK, linux_size, align);
2N/A if (seg_addr == (grub_addr_t) -1)
2N/A return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory");
2N/A
2N/A linux_addr = seg_addr + offset;
2N/A
2N/A /* Now load the segments into the area we claimed. */
2N/A auto grub_err_t offset_phdr (Elf32_Phdr *phdr, grub_addr_t *addr, int *do_load);
2N/A grub_err_t offset_phdr (Elf32_Phdr *phdr, grub_addr_t *addr, int *do_load)
2N/A {
2N/A if (phdr->p_type != PT_LOAD)
2N/A {
2N/A *do_load = 0;
2N/A return 0;
2N/A }
2N/A *do_load = 1;
2N/A
2N/A *addr = (phdr->p_paddr - base_addr) + seg_addr;
2N/A return 0;
2N/A }
2N/A return grub_elf32_load (elf, offset_phdr, 0, 0);
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_linux_load64 (grub_elf_t elf)
2N/A{
2N/A Elf64_Addr base_addr;
2N/A grub_addr_t seg_addr;
2N/A grub_uint64_t align;
2N/A grub_uint64_t offset;
2N/A Elf64_Addr entry;
2N/A
2N/A linux_size = grub_elf64_size (elf, &base_addr, &align);
2N/A if (linux_size == 0)
2N/A return grub_errno;
2N/A /* Pad it; the kernel scribbles over memory beyond its load address. */
2N/A linux_size += 0x100000;
2N/A
2N/A base_addr &= ~ELF64_LOADMASK;
2N/A entry = elf->ehdr.ehdr64.e_entry & ~ELF64_LOADMASK;
2N/A offset = entry - base_addr;
2N/A /* Linux's incorrectly contains a virtual address. */
2N/A
2N/A /* On some systems, firmware occupies the memory we're trying to use.
2N/A * Happily, Linux can be loaded anywhere (it relocates itself). Iterate
2N/A * until we find an open area. */
2N/A seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF64_LOADMASK, linux_size, align);
2N/A if (seg_addr == (grub_addr_t) -1)
2N/A return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory");
2N/A
2N/A linux_addr = seg_addr + offset;
2N/A
2N/A /* Now load the segments into the area we claimed. */
2N/A auto grub_err_t offset_phdr (Elf64_Phdr *phdr, grub_addr_t *addr, int *do_load);
2N/A grub_err_t offset_phdr (Elf64_Phdr *phdr, grub_addr_t *addr, int *do_load)
2N/A {
2N/A if (phdr->p_type != PT_LOAD)
2N/A {
2N/A *do_load = 0;
2N/A return 0;
2N/A }
2N/A *do_load = 1;
2N/A
2N/A *addr = (phdr->p_paddr - base_addr) + seg_addr;
2N/A return 0;
2N/A }
2N/A return grub_elf64_load (elf, offset_phdr, 0, 0);
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
2N/A int argc, char *argv[])
2N/A{
2N/A grub_elf_t elf = 0;
2N/A int size;
2N/A
2N/A grub_dl_ref (my_mod);
2N/A
2N/A if (argc == 0)
2N/A {
2N/A grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified");
2N/A goto out;
2N/A }
2N/A
2N/A elf = grub_elf_open (argv[0]);
2N/A if (! elf)
2N/A goto out;
2N/A
2N/A if (elf->ehdr.ehdr32.e_type != ET_EXEC && elf->ehdr.ehdr32.e_type != ET_DYN)
2N/A {
2N/A grub_error (GRUB_ERR_UNKNOWN_OS,
2N/A "this ELF file is not of the right type");
2N/A goto out;
2N/A }
2N/A
2N/A /* Release the previously used memory. */
2N/A grub_loader_unset ();
2N/A
2N/A if (grub_elf_is_elf32 (elf))
2N/A grub_linux_load32 (elf);
2N/A else
2N/A if (grub_elf_is_elf64 (elf))
2N/A grub_linux_load64 (elf);
2N/A else
2N/A {
2N/A grub_error (GRUB_ERR_BAD_FILE_TYPE, "unknown ELF class");
2N/A goto out;
2N/A }
2N/A
2N/A size = grub_loader_cmdline_size(argc, argv);
2N/A linux_args = grub_malloc (size + sizeof (LINUX_IMAGE));
2N/A if (! linux_args)
2N/A goto out;
2N/A
2N/A /* Create kernel command line. */
2N/A grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
2N/A grub_create_loader_cmdline (argc, argv, linux_args + sizeof (LINUX_IMAGE) - 1,
2N/A size);
2N/A
2N/Aout:
2N/A
2N/A if (elf)
2N/A grub_elf_close (elf);
2N/A
2N/A if (grub_errno != GRUB_ERR_NONE)
2N/A {
2N/A grub_linux_release_mem ();
2N/A grub_dl_unref (my_mod);
2N/A loaded = 0;
2N/A }
2N/A else
2N/A {
2N/A grub_loader_set (grub_linux_boot, grub_linux_unload, 1);
2N/A initrd_addr = 0;
2N/A loaded = 1;
2N/A }
2N/A
2N/A return grub_errno;
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
2N/A int argc, char *argv[])
2N/A{
2N/A grub_file_t *files = 0;
2N/A grub_size_t size = 0;
2N/A grub_addr_t first_addr;
2N/A grub_addr_t addr;
2N/A int i;
2N/A int nfiles = 0;
2N/A grub_uint8_t *ptr;
2N/A
2N/A if (argc == 0)
2N/A {
2N/A grub_error (GRUB_ERR_BAD_ARGUMENT, "no initrd specified");
2N/A goto fail;
2N/A }
2N/A
2N/A if (!loaded)
2N/A {
2N/A grub_error (GRUB_ERR_BAD_ARGUMENT, "you need to load the kernel first");
2N/A goto fail;
2N/A }
2N/A
2N/A files = grub_zalloc (argc * sizeof (files[0]));
2N/A if (!files)
2N/A goto fail;
2N/A
2N/A for (i = 0; i < argc; i++)
2N/A {
2N/A grub_file_filter_disable_compression ();
2N/A files[i] = grub_file_open (argv[i]);
2N/A if (! files[i])
2N/A goto fail;
2N/A nfiles++;
2N/A size += grub_file_size (files[i]);
2N/A }
2N/A
2N/A first_addr = linux_addr + linux_size;
2N/A
2N/A /* Attempt to claim at a series of addresses until successful in
2N/A the same way that grub_rescue_cmd_linux does. */
2N/A addr = grub_linux_claimmap_iterate (first_addr, size, 0x100000);
2N/A if (addr == (grub_addr_t) -1)
2N/A goto fail;
2N/A
2N/A grub_dprintf ("loader", "Loading initrd at 0x%x, size 0x%x\n", addr, size);
2N/A
2N/A ptr = (void *) addr;
2N/A for (i = 0; i < nfiles; i++)
2N/A {
2N/A grub_ssize_t cursize = grub_file_size (files[i]);
2N/A if (grub_file_read (files[i], ptr, cursize) != cursize)
2N/A {
2N/A grub_ieee1275_release (addr, size);
2N/A if (!grub_errno)
2N/A grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
2N/A argv[i]);
2N/A goto fail;
2N/A }
2N/A ptr += cursize;
2N/A }
2N/A
2N/A initrd_addr = addr;
2N/A initrd_size = size;
2N/A
2N/A fail:
2N/A for (i = 0; i < nfiles; i++)
2N/A grub_file_close (files[i]);
2N/A grub_free (files);
2N/A
2N/A return grub_errno;
2N/A}
2N/A
2N/Astatic grub_command_t cmd_linux, cmd_initrd;
2N/A
2N/AGRUB_MOD_INIT(linux)
2N/A{
2N/A cmd_linux = grub_register_command ("linux", grub_cmd_linux,
2N/A 0, N_("Load Linux."));
2N/A cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
2N/A 0, N_("Load initrd."));
2N/A my_mod = mod;
2N/A}
2N/A
2N/AGRUB_MOD_FINI(linux)
2N/A{
2N/A grub_unregister_command (cmd_linux);
2N/A grub_unregister_command (cmd_initrd);
2N/A}