283 lines
6.8 KiB
C
283 lines
6.8 KiB
C
/* linux.c - boot Linux zImage or bzImage */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008 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/loader.h>
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#include <grub/machine/loader.h>
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#include <grub/machine/memory.h>
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#include <grub/file.h>
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#include <grub/err.h>
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#include <grub/disk.h>
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#include <grub/misc.h>
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#include <grub/types.h>
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#include <grub/rescue.h>
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#include <grub/mm.h>
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#include <grub/dl.h>
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#include <grub/env.h>
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#include <grub/term.h>
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#include <grub/cpu/linux.h>
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#include <grub/ieee1275/ieee1275.h>
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#define GRUB_OFW_LINUX_PARAMS_ADDR 0x90000
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#define GRUB_OFW_LINUX_KERNEL_ADDR 0x100000
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#define GRUB_OFW_LINUX_INITRD_ADDR 0x800000
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#define GRUB_OFW_LINUX_CL_OFFSET 0x1e00
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#define GRUB_OFW_LINUX_CL_LENGTH 0x100
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static grub_dl_t my_mod;
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static grub_size_t kernel_size;
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static char *kernel_addr, *kernel_cmdline;
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static grub_size_t initrd_size;
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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_free (kernel_cmdline);
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grub_free (kernel_addr);
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kernel_cmdline = 0;
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kernel_addr = 0;
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initrd_size = 0;
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grub_dl_unref (my_mod);
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return GRUB_ERR_NONE;
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}
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/*
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static int
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grub_ieee1275_debug (void)
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{
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struct enter_args
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{
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struct grub_ieee1275_common_hdr common;
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}
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args;
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INIT_IEEE1275_COMMON (&args.common, "enter", 0, 0);
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if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
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return -1;
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return 0;
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}
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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_kernel_params *params;
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struct linux_kernel_header *lh;
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char *prot_code;
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char *bootpath;
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grub_ssize_t len;
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bootpath = grub_env_get ("root");
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if (bootpath)
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grub_ieee1275_set_property (grub_ieee1275_chosen,
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"bootpath", bootpath,
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grub_strlen (bootpath) + 1,
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&len);
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params = (struct linux_kernel_params *) GRUB_OFW_LINUX_PARAMS_ADDR;
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lh = (struct linux_kernel_header *) params;
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grub_memset ((char *) params, 0, GRUB_OFW_LINUX_CL_OFFSET);
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params->alt_mem = grub_upper_mem >> 10;
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params->ext_mem = params->alt_mem;
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lh->cmd_line_ptr = (char *)
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(GRUB_OFW_LINUX_PARAMS_ADDR + GRUB_OFW_LINUX_CL_OFFSET);
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params->cl_magic = GRUB_LINUX_CL_MAGIC;
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params->cl_offset = GRUB_OFW_LINUX_CL_OFFSET;
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params->video_width = (grub_getwh () >> 8);
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params->video_height = (grub_getwh () & 0xff);
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params->font_size = 16;
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params->ofw_signature = GRUB_LINUX_OFW_SIGNATURE;
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params->ofw_num_items = 1;
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params->ofw_cif_handler = (grub_uint32_t) grub_ieee1275_entry_fn;
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params->ofw_idt = 0;
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if (initrd_size)
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{
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lh->type_of_loader = 1;
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lh->ramdisk_image = GRUB_OFW_LINUX_INITRD_ADDR;
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lh->ramdisk_size = initrd_size;
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}
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if (kernel_cmdline)
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grub_strcpy (lh->cmd_line_ptr, kernel_cmdline);
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prot_code = (char *) GRUB_OFW_LINUX_KERNEL_ADDR;
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grub_memcpy (prot_code, kernel_addr, kernel_size);
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asm volatile ("movl %0, %%esi" : : "m" (params));
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asm volatile ("movl %%esi, %%esp" : : );
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asm volatile ("movl %0, %%ecx" : : "m" (prot_code));
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asm volatile ("xorl %%ebx, %%ebx" : : );
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asm volatile ("jmp *%%ecx" : : );
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return GRUB_ERR_NONE;
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}
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void
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grub_rescue_cmd_linux (int argc, char *argv[])
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{
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grub_file_t file = 0;
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struct linux_kernel_header lh;
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grub_uint8_t setup_sects;
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grub_size_t real_size, prot_size;
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int i;
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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 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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if (grub_file_read (file, (char *) &lh, sizeof (lh)) != sizeof (lh))
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{
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grub_error (GRUB_ERR_READ_ERROR, "cannot read the linux header");
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goto fail;
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}
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if ((lh.boot_flag != grub_cpu_to_le16 (0xaa55)) ||
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(lh.header != grub_cpu_to_le32 (GRUB_LINUX_MAGIC_SIGNATURE)))
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{
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grub_error (GRUB_ERR_BAD_OS, "invalid magic number");
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goto fail;
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}
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setup_sects = lh.setup_sects;
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if (! setup_sects)
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setup_sects = GRUB_LINUX_DEFAULT_SETUP_SECTS;
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real_size = setup_sects << GRUB_DISK_SECTOR_BITS;
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prot_size = grub_file_size (file) - real_size - GRUB_DISK_SECTOR_SIZE;
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grub_printf (" [Linux-%s, setup=0x%x, size=0x%x]\n",
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"bzImage", real_size, prot_size);
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grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE);
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if (grub_errno)
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goto fail;
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kernel_cmdline = grub_malloc (GRUB_OFW_LINUX_CL_LENGTH);
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if (! kernel_cmdline)
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goto fail;
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dest = kernel_cmdline;
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for (i = 1;
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i < argc
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&& dest + grub_strlen (argv[i]) + 1 < (kernel_cmdline
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+ GRUB_OFW_LINUX_CL_LENGTH);
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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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kernel_addr = grub_malloc (prot_size);
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if (! kernel_addr)
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goto fail;
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kernel_size = prot_size;
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if (grub_file_read (file, kernel_addr, prot_size) != (int) prot_size)
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grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
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if (grub_errno == GRUB_ERR_NONE)
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grub_loader_set (grub_linux_boot, grub_linux_unload, 1);
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fail:
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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_free (kernel_cmdline);
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grub_free (kernel_addr);
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kernel_cmdline = 0;
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kernel_addr = 0;
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grub_dl_unref (my_mod);
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}
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}
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void
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grub_rescue_cmd_initrd (int argc, char *argv[])
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{
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grub_file_t file = 0;
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if (argc == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "No module specified");
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goto fail;
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}
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if (! kernel_addr)
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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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initrd_size = grub_file_size (file);
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if (grub_file_read (file, (char *) GRUB_OFW_LINUX_INITRD_ADDR,
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initrd_size) != (int) initrd_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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fail:
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if (file)
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grub_file_close (file);
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}
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GRUB_MOD_INIT(linux)
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{
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grub_rescue_register_command ("linux",
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grub_rescue_cmd_linux,
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"load linux");
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grub_rescue_register_command ("initrd",
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grub_rescue_cmd_initrd,
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"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_rescue_unregister_command ("linux");
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grub_rescue_unregister_command ("initrd");
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}
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