529 lines
12 KiB
C
529 lines
12 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/machine/loader.h>
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#include <grub/gzio.h>
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#include <grub/command.h>
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#include <grub/i18n.h>
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static grub_dl_t my_mod;
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static int loaded;
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/* /virtual-memory/translations property layout */
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struct grub_ieee1275_translation {
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grub_uint64_t vaddr;
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grub_uint64_t size;
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grub_uint64_t data;
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};
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static struct grub_ieee1275_translation *of_trans;
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static int of_num_trans;
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static grub_addr_t phys_base;
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static grub_addr_t grub_phys_start;
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static grub_addr_t grub_phys_end;
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static grub_addr_t initrd_addr;
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static grub_addr_t initrd_paddr;
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static grub_size_t initrd_size;
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static Elf64_Addr linux_entry;
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static grub_addr_t linux_addr;
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static grub_addr_t linux_paddr;
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static grub_size_t linux_size;
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static char *linux_args;
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struct linux_bootstr_info {
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int len, valid;
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char buf[];
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};
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struct linux_hdrs {
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/* All HdrS versions support these fields. */
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unsigned int start_insns[2];
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char magic[4]; /* "HdrS" */
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unsigned int linux_kernel_version; /* LINUX_VERSION_CODE */
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unsigned short hdrs_version;
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unsigned short root_flags;
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unsigned short root_dev;
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unsigned short ram_flags;
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unsigned int __deprecated_ramdisk_image;
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unsigned int ramdisk_size;
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/* HdrS versions 0x0201 and higher only */
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char *reboot_command;
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/* HdrS versions 0x0202 and higher only */
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struct linux_bootstr_info *bootstr_info;
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/* HdrS versions 0x0301 and higher only */
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unsigned long ramdisk_image;
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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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struct linux_bootstr_info *bp;
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struct linux_hdrs *hp;
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grub_addr_t addr;
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hp = (struct linux_hdrs *) linux_addr;
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/* Any pointer we dereference in the kernel image must be relocated
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to where we actually loaded the kernel. */
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addr = (grub_addr_t) hp->bootstr_info;
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addr += (linux_addr - linux_entry);
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bp = (struct linux_bootstr_info *) addr;
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/* Set the command line arguments, unless the kernel has been
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built with a fixed CONFIG_CMDLINE. */
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if (!bp->valid)
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{
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int len = grub_strlen (linux_args) + 1;
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if (bp->len < len)
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len = bp->len;
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memcpy(bp->buf, linux_args, len);
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bp->buf[len-1] = '\0';
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bp->valid = 1;
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}
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if (initrd_addr)
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{
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/* The kernel expects the physical address, adjusted relative
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to the lowest address advertised in "/memory"'s available
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property.
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The history of this is that back when the kernel only supported
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specifying a 32-bit ramdisk address, this was the way to still
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be able to specify the ramdisk physical address even if memory
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started at some place above 4GB.
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The magic 0x400000 is KERNBASE, I have no idea why SILO adds
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that term into the address, but it does and thus we have to do
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it too as this is what the kernel expects. */
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hp->ramdisk_image = initrd_paddr - phys_base + 0x400000;
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hp->ramdisk_size = initrd_size;
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}
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grub_dprintf ("loader", "Entry point: 0x%lx\n", linux_addr);
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grub_dprintf ("loader", "Initrd at: 0x%lx, size 0x%lx\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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asm volatile ("sethi %hi(grub_ieee1275_entry_fn), %o1\n"
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"ldx [%o1 + %lo(grub_ieee1275_entry_fn)], %o4\n"
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"sethi %hi(grub_ieee1275_original_stack), %o1\n"
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"ldx [%o1 + %lo(grub_ieee1275_original_stack)], %o6\n"
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"sethi %hi(linux_addr), %o1\n"
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"ldx [%o1 + %lo(linux_addr)], %o5\n"
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"mov %g0, %o0\n"
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"mov %g0, %o2\n"
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"mov %g0, %o3\n"
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"jmp %o5\n"
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"mov %g0, %o1\n");
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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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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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#define FOUR_MB (4 * 1024 * 1024)
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static grub_addr_t
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alloc_phys (grub_addr_t size)
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{
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grub_addr_t ret = (grub_addr_t) -1;
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auto int NESTED_FUNC_ATTR choose (grub_uint64_t addr, grub_uint64_t len __attribute__((unused)), grub_uint32_t type);
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int NESTED_FUNC_ATTR choose (grub_uint64_t addr, grub_uint64_t len __attribute__((unused)), grub_uint32_t type)
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{
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grub_addr_t end = addr + len;
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if (type != 1)
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return 0;
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addr = ALIGN_UP (addr, FOUR_MB);
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if (addr + size >= end)
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return 0;
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if (addr >= grub_phys_start && addr < grub_phys_end)
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{
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addr = ALIGN_UP (grub_phys_end, FOUR_MB);
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if (addr + size >= end)
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return 0;
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}
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if ((addr + size) >= grub_phys_start
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&& (addr + size) < grub_phys_end)
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{
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addr = ALIGN_UP (grub_phys_end, FOUR_MB);
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if (addr + size >= end)
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return 0;
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}
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if (loaded)
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{
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grub_addr_t linux_end = ALIGN_UP (linux_paddr + linux_size, FOUR_MB);
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if (addr >= linux_paddr && addr < linux_end)
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{
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addr = linux_end;
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if (addr + size >= end)
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return 0;
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}
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if ((addr + size) >= linux_paddr
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&& (addr + size) < linux_end)
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{
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addr = linux_end;
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if (addr + size >= end)
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return 0;
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}
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}
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ret = addr;
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return 1;
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}
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grub_machine_mmap_iterate (choose);
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return ret;
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}
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static grub_err_t
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grub_linux_load64 (grub_elf_t elf)
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{
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grub_addr_t off, paddr, base;
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int ret;
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linux_entry = elf->ehdr.ehdr64.e_entry;
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linux_addr = 0x40004000;
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off = 0x4000;
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linux_size = grub_elf64_size (elf, 0);
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if (linux_size == 0)
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return grub_errno;
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grub_dprintf ("loader", "Attempting to claim at 0x%lx, size 0x%lx.\n",
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linux_addr, linux_size);
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paddr = alloc_phys (linux_size + off);
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if (paddr == (grub_addr_t) -1)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"couldn't allocate physical memory");
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ret = grub_ieee1275_map (paddr, linux_addr - off,
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linux_size + off, IEEE1275_MAP_DEFAULT);
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if (ret)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"couldn't map physical memory");
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grub_dprintf ("loader", "Loading Linux at vaddr 0x%lx, paddr 0x%lx, size 0x%lx\n",
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linux_addr, paddr, linux_size);
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linux_paddr = paddr;
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base = linux_entry - off;
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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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/* Adjust the program load address to linux_addr. */
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*addr = (phdr->p_paddr - base) + (linux_addr - off);
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return 0;
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}
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return grub_elf64_load (elf, 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_file_t file = 0;
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grub_elf_t elf = 0;
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int i;
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int size;
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char *dest;
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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, "no kernel specified");
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goto out;
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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 out;
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elf = grub_elf_file (file);
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if (! elf)
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goto out;
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if (elf->ehdr.ehdr32.e_type != ET_EXEC)
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{
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grub_error (GRUB_ERR_UNKNOWN_OS,
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"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_elf64 (elf))
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grub_linux_load64 (elf);
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else
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{
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "unknown ELF class");
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goto out;
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}
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size = sizeof ("BOOT_IMAGE=") + grub_strlen (argv[0]);
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for (i = 0; i < argc; i++)
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size += grub_strlen (argv[i]) + 1;
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linux_args = grub_malloc (size);
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if (! linux_args)
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goto out;
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/* Specify the boot file. */
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dest = grub_stpcpy (linux_args, "BOOT_IMAGE=");
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dest = grub_stpcpy (dest, argv[0]);
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for (i = 1; i < argc; i++)
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{
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*dest++ = ' ';
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dest = grub_stpcpy (dest, argv[i]);
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}
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out:
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if (elf)
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grub_elf_close (elf);
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else 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_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 file = 0;
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grub_ssize_t size;
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grub_addr_t paddr;
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grub_addr_t addr;
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int ret;
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if (argc == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "no initrd specified");
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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, "you need to load the kernel first");
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goto fail;
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}
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file = grub_file_open (argv[0]);
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if (! file)
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goto fail;
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addr = 0x60000000;
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size = grub_file_size (file);
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paddr = alloc_phys (size);
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if (paddr == (grub_addr_t) -1)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"couldn't allocate physical memory");
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goto fail;
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}
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ret = grub_ieee1275_map (paddr, addr, size, IEEE1275_MAP_DEFAULT);
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if (ret)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"couldn't map physical memory");
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goto fail;
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}
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grub_dprintf ("loader", "Loading initrd at vaddr 0x%lx, paddr 0x%lx, size 0x%lx\n",
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addr, paddr, size);
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if (grub_file_read (file, (void *) addr, 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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initrd_addr = addr;
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initrd_paddr = paddr;
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initrd_size = size;
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fail:
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if (file)
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grub_file_close (file);
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return grub_errno;
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}
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static void
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determine_phys_base (void)
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{
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auto int NESTED_FUNC_ATTR get_physbase (grub_uint64_t addr, grub_uint64_t len __attribute__((unused)), grub_uint32_t type);
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int NESTED_FUNC_ATTR get_physbase (grub_uint64_t addr, grub_uint64_t len __attribute__((unused)), grub_uint32_t type)
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{
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if (type != 1)
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return 0;
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if (addr < phys_base)
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phys_base = addr;
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return 0;
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}
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phys_base = ~(grub_uint64_t) 0;
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grub_machine_mmap_iterate (get_physbase);
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}
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static void
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fetch_translations (void)
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{
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grub_ieee1275_phandle_t node;
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grub_ssize_t actual;
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int i;
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if (grub_ieee1275_finddevice ("/virtual-memory", &node))
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{
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grub_printf ("Cannot find /virtual-memory node.\n");
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return;
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}
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if (grub_ieee1275_get_property_length (node, "translations", &actual))
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{
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grub_printf ("Cannot find /virtual-memory/translations size.\n");
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return;
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}
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of_trans = grub_malloc (actual);
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if (!of_trans)
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{
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grub_printf ("Cannot allocate translations buffer.\n");
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return;
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}
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if (grub_ieee1275_get_property (node, "translations", of_trans, actual, &actual))
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{
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grub_printf ("Cannot fetch /virtual-memory/translations property.\n");
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return;
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}
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of_num_trans = actual / sizeof(struct grub_ieee1275_translation);
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for (i = 0; i < of_num_trans; i++)
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{
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struct grub_ieee1275_translation *p = &of_trans[i];
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if (p->vaddr == 0x2000)
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{
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grub_addr_t phys, tte = p->data;
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phys = tte & ~(0xff00000000001fffULL);
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grub_phys_start = phys;
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grub_phys_end = grub_phys_start + p->size;
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grub_dprintf ("loader", "Grub lives at phys_start[%lx] phys_end[%lx]\n",
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(unsigned long) grub_phys_start,
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(unsigned long) grub_phys_end);
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break;
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}
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}
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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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determine_phys_base ();
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fetch_translations ();
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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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