289 lines
7 KiB
C
289 lines
7 KiB
C
/* linux.c - boot Linux zImage or bzImage */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <grub/loader.h>
|
|
#include <grub/machine/loader.h>
|
|
#include <grub/machine/memory.h>
|
|
#include <grub/file.h>
|
|
#include <grub/err.h>
|
|
#include <grub/disk.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/types.h>
|
|
#include <grub/mm.h>
|
|
#include <grub/dl.h>
|
|
#include <grub/env.h>
|
|
#include <grub/term.h>
|
|
#include <grub/cpu/linux.h>
|
|
#include <grub/ieee1275/ieee1275.h>
|
|
#include <grub/command.h>
|
|
|
|
#define GRUB_OFW_LINUX_PARAMS_ADDR 0x90000
|
|
#define GRUB_OFW_LINUX_KERNEL_ADDR 0x100000
|
|
#define GRUB_OFW_LINUX_INITRD_ADDR 0x800000
|
|
|
|
#define GRUB_OFW_LINUX_CL_OFFSET 0x1e00
|
|
#define GRUB_OFW_LINUX_CL_LENGTH 0x100
|
|
|
|
static grub_dl_t my_mod;
|
|
|
|
static grub_size_t kernel_size;
|
|
static char *kernel_addr, *kernel_cmdline;
|
|
static grub_size_t initrd_size;
|
|
|
|
static grub_err_t
|
|
grub_linux_unload (void)
|
|
{
|
|
grub_free (kernel_cmdline);
|
|
grub_free (kernel_addr);
|
|
kernel_cmdline = 0;
|
|
kernel_addr = 0;
|
|
initrd_size = 0;
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
/*
|
|
static int
|
|
grub_ieee1275_debug (void)
|
|
{
|
|
struct enter_args
|
|
{
|
|
struct grub_ieee1275_common_hdr common;
|
|
}
|
|
args;
|
|
|
|
INIT_IEEE1275_COMMON (&args.common, "enter", 0, 0);
|
|
|
|
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
*/
|
|
|
|
static grub_err_t
|
|
grub_linux_boot (void)
|
|
{
|
|
struct linux_kernel_params *params;
|
|
struct linux_kernel_header *lh;
|
|
char *prot_code;
|
|
char *bootpath;
|
|
grub_ssize_t len;
|
|
|
|
bootpath = grub_env_get ("root");
|
|
if (bootpath)
|
|
grub_ieee1275_set_property (grub_ieee1275_chosen,
|
|
"bootpath", bootpath,
|
|
grub_strlen (bootpath) + 1,
|
|
&len);
|
|
|
|
params = (struct linux_kernel_params *) GRUB_OFW_LINUX_PARAMS_ADDR;
|
|
lh = (struct linux_kernel_header *) params;
|
|
|
|
grub_memset ((char *) params, 0, GRUB_OFW_LINUX_CL_OFFSET);
|
|
|
|
params->alt_mem = grub_mmap_get_upper () >> 10;
|
|
params->ext_mem = params->alt_mem;
|
|
|
|
lh->cmd_line_ptr = (char *)
|
|
(GRUB_OFW_LINUX_PARAMS_ADDR + GRUB_OFW_LINUX_CL_OFFSET);
|
|
|
|
params->cl_magic = GRUB_LINUX_CL_MAGIC;
|
|
params->cl_offset = GRUB_OFW_LINUX_CL_OFFSET;
|
|
|
|
params->video_width = (grub_getwh () >> 8);
|
|
params->video_height = (grub_getwh () & 0xff);
|
|
params->font_size = 16;
|
|
|
|
params->ofw_signature = GRUB_LINUX_OFW_SIGNATURE;
|
|
params->ofw_num_items = 1;
|
|
params->ofw_cif_handler = (grub_uint32_t) grub_ieee1275_entry_fn;
|
|
params->ofw_idt = 0;
|
|
|
|
if (initrd_size)
|
|
{
|
|
lh->type_of_loader = 1;
|
|
lh->ramdisk_image = GRUB_OFW_LINUX_INITRD_ADDR;
|
|
lh->ramdisk_size = initrd_size;
|
|
}
|
|
|
|
if (kernel_cmdline)
|
|
grub_strcpy (lh->cmd_line_ptr, kernel_cmdline);
|
|
|
|
prot_code = (char *) GRUB_OFW_LINUX_KERNEL_ADDR;
|
|
grub_memcpy (prot_code, kernel_addr, kernel_size);
|
|
|
|
asm volatile ("movl %0, %%esi" : : "m" (params));
|
|
asm volatile ("movl %%esi, %%esp" : : );
|
|
asm volatile ("movl %0, %%ecx" : : "m" (prot_code));
|
|
asm volatile ("xorl %%ebx, %%ebx" : : );
|
|
asm volatile ("jmp *%%ecx" : : );
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
|
|
int argc, char *argv[])
|
|
{
|
|
grub_file_t file = 0;
|
|
struct linux_kernel_header lh;
|
|
grub_uint8_t setup_sects;
|
|
grub_size_t real_size, prot_size;
|
|
int i;
|
|
char *dest;
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
if (argc == 0)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified");
|
|
goto fail;
|
|
}
|
|
|
|
file = grub_file_open (argv[0]);
|
|
if (! file)
|
|
goto fail;
|
|
|
|
if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
|
|
{
|
|
grub_error (GRUB_ERR_READ_ERROR, "cannot read the linux header");
|
|
goto fail;
|
|
}
|
|
|
|
if ((lh.boot_flag != grub_cpu_to_le16 (0xaa55)) ||
|
|
(lh.header != grub_cpu_to_le32 (GRUB_LINUX_MAGIC_SIGNATURE)))
|
|
{
|
|
grub_error (GRUB_ERR_BAD_OS, "invalid magic number");
|
|
goto fail;
|
|
}
|
|
|
|
setup_sects = lh.setup_sects;
|
|
if (! setup_sects)
|
|
setup_sects = GRUB_LINUX_DEFAULT_SETUP_SECTS;
|
|
|
|
real_size = setup_sects << GRUB_DISK_SECTOR_BITS;
|
|
prot_size = grub_file_size (file) - real_size - GRUB_DISK_SECTOR_SIZE;
|
|
|
|
grub_printf (" [Linux-%s, setup=0x%x, size=0x%x]\n",
|
|
"bzImage", real_size, prot_size);
|
|
|
|
grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE);
|
|
if (grub_errno)
|
|
goto fail;
|
|
|
|
kernel_cmdline = grub_malloc (GRUB_OFW_LINUX_CL_LENGTH);
|
|
if (! kernel_cmdline)
|
|
goto fail;
|
|
|
|
dest = kernel_cmdline;
|
|
for (i = 1;
|
|
i < argc
|
|
&& dest + grub_strlen (argv[i]) + 1 < (kernel_cmdline
|
|
+ GRUB_OFW_LINUX_CL_LENGTH);
|
|
i++)
|
|
{
|
|
*dest++ = ' ';
|
|
dest = grub_stpcpy (dest, argv[i]);
|
|
}
|
|
|
|
kernel_addr = grub_malloc (prot_size);
|
|
if (! kernel_addr)
|
|
goto fail;
|
|
|
|
kernel_size = prot_size;
|
|
if (grub_file_read (file, kernel_addr, prot_size) != (int) prot_size)
|
|
grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file");
|
|
|
|
if (grub_errno == GRUB_ERR_NONE)
|
|
grub_loader_set (grub_linux_boot, grub_linux_unload, 1);
|
|
|
|
fail:
|
|
|
|
if (file)
|
|
grub_file_close (file);
|
|
|
|
if (grub_errno != GRUB_ERR_NONE)
|
|
{
|
|
grub_free (kernel_cmdline);
|
|
grub_free (kernel_addr);
|
|
kernel_cmdline = 0;
|
|
kernel_addr = 0;
|
|
|
|
grub_dl_unref (my_mod);
|
|
}
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
|
|
int argc, char *argv[])
|
|
{
|
|
grub_file_t file = 0;
|
|
|
|
if (argc == 0)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified");
|
|
goto fail;
|
|
}
|
|
|
|
if (! kernel_addr)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_ARGUMENT, "you need to load the kernel first");
|
|
goto fail;
|
|
}
|
|
|
|
file = grub_file_open (argv[0]);
|
|
if (! file)
|
|
goto fail;
|
|
|
|
initrd_size = grub_file_size (file);
|
|
if (grub_file_read (file, (void *) GRUB_OFW_LINUX_INITRD_ADDR,
|
|
initrd_size) != (int) initrd_size)
|
|
{
|
|
grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file");
|
|
goto fail;
|
|
}
|
|
|
|
fail:
|
|
if (file)
|
|
grub_file_close (file);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_command_t cmd_linux, cmd_initrd;
|
|
|
|
GRUB_MOD_INIT(linux)
|
|
{
|
|
cmd_linux = grub_register_command ("linux", grub_cmd_linux,
|
|
0, "Load Linux.");
|
|
cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
|
|
0, "Load initrd.");
|
|
my_mod = mod;
|
|
}
|
|
|
|
GRUB_MOD_FINI(linux)
|
|
{
|
|
grub_unregister_command (cmd_linux);
|
|
grub_unregister_command (cmd_initrd);
|
|
}
|