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grub/loader/i386/pc/linux.c

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/* linux.c - boot Linux zImage or bzImage */
/*
* PUPA -- Preliminary Universal Programming Architecture for GRUB
* Copyright (C) 1999,2000,2001,2002 Free Software Foundation, Inc.
* Copyright (C) 2003 Yoshinori K. Okuji <okuji@enbug.org>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <pupa/loader.h>
#include <pupa/machine/loader.h>
#include <pupa/file.h>
#include <pupa/err.h>
#include <pupa/device.h>
#include <pupa/disk.h>
#include <pupa/misc.h>
#include <pupa/types.h>
#include <pupa/machine/init.h>
#include <pupa/machine/memory.h>
#include <pupa/rescue.h>
#include <pupa/dl.h>
#include <pupa/machine/linux.h>
static pupa_dl_t my_mod;
static int big_linux;
static pupa_size_t linux_mem_size;
static int loaded;
static pupa_err_t
pupa_linux_boot (void)
{
if (big_linux)
pupa_linux_boot_bzimage ();
else
pupa_linux_boot_zimage ();
/* Never reach here. */
return PUPA_ERR_NONE;
}
static pupa_err_t
pupa_linux_unload (void)
{
pupa_dl_unref (my_mod);
loaded = 0;
return PUPA_ERR_NONE;
}
static void
pupa_rescue_cmd_linux (int argc, char *argv[])
{
pupa_file_t file = 0;
struct linux_kernel_header lh;
pupa_uint8_t setup_sects;
pupa_size_t real_size, prot_size;
int i;
char *dest;
pupa_dl_ref (my_mod);
if (argc == 0)
{
pupa_error (PUPA_ERR_BAD_ARGUMENT, "no kernel specified");
goto fail;
}
file = pupa_file_open (argv[0]);
if (! file)
goto fail;
if (pupa_file_size (file) > (pupa_ssize_t) pupa_os_area_size)
{
pupa_error (PUPA_ERR_OUT_OF_RANGE, "too big kernel");
goto fail;
}
if (pupa_file_read (file, (char *) &lh, sizeof (lh)) != sizeof (lh))
{
pupa_error (PUPA_ERR_READ_ERROR, "cannot read the linux header");
goto fail;
}
if (lh.boot_flag != pupa_cpu_to_le16 (0xaa55))
{
pupa_error (PUPA_ERR_BAD_OS, "invalid magic number");
goto fail;
}
if (lh.setup_sects > PUPA_LINUX_MAX_SETUP_SECTS)
{
pupa_error (PUPA_ERR_BAD_OS, "too many setup sectors");
goto fail;
}
big_linux = 0;
setup_sects = lh.setup_sects;
linux_mem_size = 0;
if (lh.header == pupa_cpu_to_le32 (PUPA_LINUX_MAGIC_SIGNATURE)
&& pupa_le_to_cpu16 (lh.version) >= 0x0200)
{
big_linux = (lh.loadflags & PUPA_LINUX_FLAG_BIG_KERNEL);
lh.type_of_loader = PUPA_LINUX_BOOT_LOADER_TYPE;
/* Put the real mode part at as a high location as possible. */
pupa_linux_real_addr = (char *) (pupa_lower_mem
- PUPA_LINUX_SETUP_MOVE_SIZE);
/* But it must not exceed the traditional area. */
if (pupa_linux_real_addr > (char *) PUPA_LINUX_OLD_REAL_MODE_ADDR)
pupa_linux_real_addr = (char *) PUPA_LINUX_OLD_REAL_MODE_ADDR;
if (pupa_le_to_cpu16 (lh.version) >= 0x0201)
{
lh.heap_end_ptr = pupa_cpu_to_le16 (PUPA_LINUX_HEAP_END_OFFSET);
lh.loadflags |= PUPA_LINUX_FLAG_CAN_USE_HEAP;
}
if (pupa_le_to_cpu16 (lh.version) >= 0x0202)
lh.cmd_line_ptr = pupa_linux_real_addr + PUPA_LINUX_CL_OFFSET;
else
{
lh.cl_magic = pupa_cpu_to_le16 (PUPA_LINUX_CL_MAGIC);
lh.cl_offset = pupa_cpu_to_le16 (PUPA_LINUX_CL_OFFSET);
lh.setup_move_size = pupa_cpu_to_le16 (PUPA_LINUX_SETUP_MOVE_SIZE);
}
}
else
{
/* Your kernel is quite old... */
lh.cl_magic = pupa_cpu_to_le16 (PUPA_LINUX_CL_MAGIC);
lh.cl_offset = pupa_cpu_to_le16 (PUPA_LINUX_CL_OFFSET);
setup_sects = PUPA_LINUX_DEFAULT_SETUP_SECTS;
pupa_linux_real_addr = (char *) PUPA_LINUX_OLD_REAL_MODE_ADDR;
}
/* If SETUP_SECTS is not set, set it to the default (4). */
if (! setup_sects)
setup_sects = PUPA_LINUX_DEFAULT_SETUP_SECTS;
real_size = setup_sects << PUPA_DISK_SECTOR_BITS;
prot_size = pupa_file_size (file) - real_size - PUPA_DISK_SECTOR_SIZE;
pupa_linux_tmp_addr = (char *) PUPA_LINUX_BZIMAGE_ADDR + prot_size;
if (! big_linux
&& prot_size > (pupa_size_t) (pupa_linux_real_addr
- (char *) PUPA_LINUX_ZIMAGE_ADDR))
{
pupa_error (PUPA_ERR_BAD_OS, "too big zImage, use bzImage instead");
goto fail;
}
if (pupa_linux_real_addr + PUPA_LINUX_SETUP_MOVE_SIZE
> (char *) pupa_lower_mem)
{
pupa_error (PUPA_ERR_OUT_OF_RANGE, "too small lower memory");
goto fail;
}
pupa_printf (" [Linux-%s, setup=0x%x, size=0x%x]\n",
big_linux ? "bzImage" : "zImage", real_size, prot_size);
for (i = 1; i < argc; i++)
if (pupa_memcmp (argv[i], "vga=", 4) == 0)
{
/* Video mode selection support. */
pupa_uint16_t vid_mode;
char *val = argv[i] + 4;
if (pupa_strcmp (val, "normal") == 0)
vid_mode = PUPA_LINUX_VID_MODE_NORMAL;
else if (pupa_strcmp (val, "ext") == 0)
vid_mode = PUPA_LINUX_VID_MODE_EXTENDED;
else if (pupa_strcmp (val, "ask") == 0)
vid_mode = PUPA_LINUX_VID_MODE_ASK;
else
vid_mode = (pupa_uint16_t) pupa_strtoul (val, 0, 0);
if (pupa_errno)
goto fail;
lh.vid_mode = pupa_cpu_to_le16 (vid_mode);
}
else if (pupa_memcmp (argv[i], "mem=", 4) == 0)
{
char *val = argv[i] + 4;
linux_mem_size = pupa_strtoul (val, &val, 0);
if (pupa_errno)
{
pupa_errno = PUPA_ERR_NONE;
linux_mem_size = 0;
}
else
{
int shift = 0;
switch (pupa_tolower (val[0]))
{
case 'g':
shift += 10;
case 'm':
shift += 10;
case 'k':
shift += 10;
default:
break;
}
/* Check an overflow. */
if (linux_mem_size > (~0UL >> shift))
linux_mem_size = 0;
else
linux_mem_size <<= shift;
}
}
/* Put the real mode code at the temporary address. */
pupa_memmove (pupa_linux_tmp_addr, &lh, sizeof (lh));
pupa_file_read (file, pupa_linux_tmp_addr + sizeof (lh),
real_size + PUPA_DISK_SECTOR_SIZE - sizeof (lh));
if (lh.header != pupa_cpu_to_le32 (PUPA_LINUX_MAGIC_SIGNATURE)
|| pupa_le_to_cpu16 (lh.version) < 0x0200)
/* Clear the heap space. */
pupa_memset (pupa_linux_tmp_addr
+ ((setup_sects + 1) << PUPA_DISK_SECTOR_BITS),
0,
((PUPA_LINUX_MAX_SETUP_SECTS - setup_sects - 1)
<< PUPA_DISK_SECTOR_BITS));
/* Copy kernel parameters. */
for (i = 1, dest = pupa_linux_tmp_addr + PUPA_LINUX_CL_OFFSET;
i < argc
&& dest + pupa_strlen (argv[i]) < (pupa_linux_tmp_addr
+ PUPA_LINUX_CL_END_OFFSET);
i++, *dest++ = ' ')
{
pupa_strcpy (dest, argv[i]);
dest += pupa_strlen (argv[i]);
}
if (i != 1)
dest--;
*dest = '\0';
pupa_file_read (file, (char *) PUPA_LINUX_BZIMAGE_ADDR, prot_size);
if (pupa_errno == PUPA_ERR_NONE)
{
pupa_linux_prot_size = prot_size;
pupa_loader_set (pupa_linux_boot, pupa_linux_unload);
loaded = 1;
}
fail:
if (file)
pupa_file_close (file);
if (pupa_errno != PUPA_ERR_NONE)
{
pupa_dl_unref (my_mod);
loaded = 0;
}
}
static void
pupa_rescue_cmd_initrd (int argc, char *argv[])
{
pupa_error (PUPA_ERR_NOT_IMPLEMENTED_YET, "not implemented yet");
}
PUPA_MOD_INIT
{
pupa_rescue_register_command ("linux",
pupa_rescue_cmd_linux,
"load linux");
pupa_rescue_register_command ("initrd",
pupa_rescue_cmd_initrd,
"load initrd");
my_mod = mod;
}
PUPA_MOD_FINI
{
pupa_rescue_unregister_command ("linux");
pupa_rescue_unregister_command ("initrd");
}
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