1
/* linux.c - boot Linux zImage or bzImage */
3
* GRUB -- GRand Unified Bootloader
4
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
6
* GRUB is free software: you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation, either version 3 of the License, or
9
* (at your option) any later version.
11
* GRUB is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
* GNU General Public License for more details.
16
* You should have received a copy of the GNU General Public License
17
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
20
#include <grub/loader.h>
21
#include <grub/machine/loader.h>
22
#include <grub/file.h>
24
#include <grub/device.h>
25
#include <grub/disk.h>
26
#include <grub/misc.h>
27
#include <grub/types.h>
28
#include <grub/machine/init.h>
29
#include <grub/machine/memory.h>
31
#include <grub/cpu/linux.h>
32
#include <grub/command.h>
33
#include <grub/i18n.h>
35
#include <grub/video.h>
37
#define GRUB_LINUX_CL_OFFSET 0x9000
38
#define GRUB_LINUX_CL_END_OFFSET 0x90FF
40
static grub_dl_t my_mod;
42
static grub_size_t linux_mem_size;
46
grub_linux_unload (void)
48
grub_dl_unref (my_mod);
54
grub_linux16_boot (void)
56
grub_video_set_mode ("text", 0, 0);
57
grub_linux16_real_boot ();
64
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
65
int argc, char *argv[])
68
struct linux_kernel_header lh;
69
grub_uint8_t setup_sects;
70
grub_size_t real_size, prot_size;
79
grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified");
83
file = grub_file_open (argv[0]);
87
if ((grub_size_t) grub_file_size (file) > grub_os_area_size)
89
grub_error (GRUB_ERR_OUT_OF_RANGE, "too big kernel (0x%x > 0x%x)",
90
(grub_size_t) grub_file_size (file),
95
if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
97
grub_error (GRUB_ERR_READ_ERROR, "cannot read the Linux header");
101
if (lh.boot_flag != grub_cpu_to_le16 (0xaa55))
103
grub_error (GRUB_ERR_BAD_OS, "invalid magic number");
107
if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
109
grub_error (GRUB_ERR_BAD_OS, "too many setup sectors");
113
grub_linux_is_bzimage = 0;
114
setup_sects = lh.setup_sects;
117
if (lh.header == grub_cpu_to_le32 (GRUB_LINUX_MAGIC_SIGNATURE)
118
&& grub_le_to_cpu16 (lh.version) >= 0x0200)
120
grub_linux_is_bzimage = (lh.loadflags & GRUB_LINUX_FLAG_BIG_KERNEL);
121
lh.type_of_loader = GRUB_LINUX_BOOT_LOADER_TYPE;
123
/* Put the real mode part at as a high location as possible. */
125
= (char *) UINT_TO_PTR (grub_mmap_get_lower ()
126
- GRUB_LINUX_SETUP_MOVE_SIZE);
127
/* But it must not exceed the traditional area. */
128
if (grub_linux_real_addr > (char *) GRUB_LINUX_OLD_REAL_MODE_ADDR)
129
grub_linux_real_addr = (char *) GRUB_LINUX_OLD_REAL_MODE_ADDR;
131
if (grub_le_to_cpu16 (lh.version) >= 0x0201)
133
lh.heap_end_ptr = grub_cpu_to_le16 (GRUB_LINUX_HEAP_END_OFFSET);
134
lh.loadflags |= GRUB_LINUX_FLAG_CAN_USE_HEAP;
137
if (grub_le_to_cpu16 (lh.version) >= 0x0202)
138
lh.cmd_line_ptr = grub_linux_real_addr + GRUB_LINUX_CL_OFFSET;
141
lh.cl_magic = grub_cpu_to_le16 (GRUB_LINUX_CL_MAGIC);
142
lh.cl_offset = grub_cpu_to_le16 (GRUB_LINUX_CL_OFFSET);
143
lh.setup_move_size = grub_cpu_to_le16 (GRUB_LINUX_SETUP_MOVE_SIZE);
148
/* Your kernel is quite old... */
149
lh.cl_magic = grub_cpu_to_le16 (GRUB_LINUX_CL_MAGIC);
150
lh.cl_offset = grub_cpu_to_le16 (GRUB_LINUX_CL_OFFSET);
152
setup_sects = GRUB_LINUX_DEFAULT_SETUP_SECTS;
154
grub_linux_real_addr = (char *) GRUB_LINUX_OLD_REAL_MODE_ADDR;
157
/* If SETUP_SECTS is not set, set it to the default (4). */
159
setup_sects = GRUB_LINUX_DEFAULT_SETUP_SECTS;
161
real_size = setup_sects << GRUB_DISK_SECTOR_BITS;
162
prot_size = grub_file_size (file) - real_size - GRUB_DISK_SECTOR_SIZE;
164
grub_linux_tmp_addr = (char *) GRUB_LINUX_BZIMAGE_ADDR + prot_size;
166
if (! grub_linux_is_bzimage
167
&& ((char *) GRUB_LINUX_ZIMAGE_ADDR + prot_size > grub_linux_real_addr))
169
grub_error (GRUB_ERR_BAD_OS, "too big zImage (0x%x > 0x%x), use bzImage instead",
170
(char *) GRUB_LINUX_ZIMAGE_ADDR + prot_size,
171
(grub_size_t) grub_linux_real_addr);
175
if (grub_linux_real_addr + GRUB_LINUX_SETUP_MOVE_SIZE
176
> (char *) UINT_TO_PTR (grub_mmap_get_lower ()))
178
grub_error (GRUB_ERR_OUT_OF_RANGE,
179
"too small lower memory (0x%x > 0x%x)",
180
grub_linux_real_addr + GRUB_LINUX_SETUP_MOVE_SIZE,
181
(int) grub_mmap_get_lower ());
185
grub_dprintf ("linux", "Linux-%s, setup=0x%x, size=0x%x\n",
186
grub_linux_is_bzimage ? "bzImage" : "zImage",
187
real_size, prot_size);
189
for (i = 1; i < argc; i++)
190
if (grub_memcmp (argv[i], "vga=", 4) == 0)
192
/* Video mode selection support. */
193
grub_uint16_t vid_mode;
194
char *val = argv[i] + 4;
196
if (grub_strcmp (val, "normal") == 0)
197
vid_mode = GRUB_LINUX_VID_MODE_NORMAL;
198
else if (grub_strcmp (val, "ext") == 0)
199
vid_mode = GRUB_LINUX_VID_MODE_EXTENDED;
200
else if (grub_strcmp (val, "ask") == 0)
201
vid_mode = GRUB_LINUX_VID_MODE_ASK;
203
vid_mode = (grub_uint16_t) grub_strtoul (val, 0, 0);
208
lh.vid_mode = grub_cpu_to_le16 (vid_mode);
210
else if (grub_memcmp (argv[i], "mem=", 4) == 0)
212
char *val = argv[i] + 4;
214
linux_mem_size = grub_strtoul (val, &val, 0);
218
grub_errno = GRUB_ERR_NONE;
225
switch (grub_tolower (val[0]))
237
/* Check an overflow. */
238
if (linux_mem_size > (~0UL >> shift))
241
linux_mem_size <<= shift;
245
/* Put the real mode code at the temporary address. */
246
grub_memmove (grub_linux_tmp_addr, &lh, sizeof (lh));
248
len = real_size + GRUB_DISK_SECTOR_SIZE - sizeof (lh);
249
if (grub_file_read (file, grub_linux_tmp_addr + sizeof (lh), len) != len)
251
grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file");
255
if (lh.header != grub_cpu_to_le32 (GRUB_LINUX_MAGIC_SIGNATURE)
256
|| grub_le_to_cpu16 (lh.version) < 0x0200)
257
/* Clear the heap space. */
258
grub_memset (grub_linux_tmp_addr
259
+ ((setup_sects + 1) << GRUB_DISK_SECTOR_BITS),
261
((GRUB_LINUX_MAX_SETUP_SECTS - setup_sects - 1)
262
<< GRUB_DISK_SECTOR_BITS));
264
/* Specify the boot file. */
265
dest = grub_stpcpy (grub_linux_tmp_addr + GRUB_LINUX_CL_OFFSET,
267
dest = grub_stpcpy (dest, argv[0]);
269
/* Copy kernel parameters. */
272
&& dest + grub_strlen (argv[i]) + 1 < (grub_linux_tmp_addr
273
+ GRUB_LINUX_CL_END_OFFSET);
277
dest = grub_stpcpy (dest, argv[i]);
281
if (grub_file_read (file, (void *) GRUB_LINUX_BZIMAGE_ADDR, len) != len)
282
grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file");
284
if (grub_errno == GRUB_ERR_NONE)
286
grub_linux_prot_size = prot_size;
287
grub_loader_set (grub_linux16_boot, grub_linux_unload, 1);
294
grub_file_close (file);
296
if (grub_errno != GRUB_ERR_NONE)
298
grub_dl_unref (my_mod);
306
grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
307
int argc, char *argv[])
309
grub_file_t file = 0;
311
grub_addr_t addr_max, addr_min, addr;
312
struct linux_kernel_header *lh;
316
grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified");
322
grub_error (GRUB_ERR_BAD_ARGUMENT, "you need to load the kernel first");
326
lh = (struct linux_kernel_header *) grub_linux_tmp_addr;
328
if (!(lh->header == grub_cpu_to_le32 (GRUB_LINUX_MAGIC_SIGNATURE)
329
&& grub_le_to_cpu16 (lh->version) >= 0x0200))
331
grub_error (GRUB_ERR_BAD_OS, "the kernel is too old for initrd");
335
/* Get the highest address available for the initrd. */
336
if (grub_le_to_cpu16 (lh->version) >= 0x0203)
338
addr_max = grub_cpu_to_le32 (lh->initrd_addr_max);
340
/* XXX in reality, Linux specifies a bogus value, so
341
it is necessary to make sure that ADDR_MAX does not exceed
343
if (addr_max > GRUB_LINUX_INITRD_MAX_ADDRESS)
344
addr_max = GRUB_LINUX_INITRD_MAX_ADDRESS;
347
addr_max = GRUB_LINUX_INITRD_MAX_ADDRESS;
349
if (linux_mem_size != 0 && linux_mem_size < addr_max)
350
addr_max = linux_mem_size;
352
/* Linux 2.3.xx has a bug in the memory range check, so avoid
354
Linux 2.2.xx has a bug in the memory range check, which is
355
worse than that of Linux 2.3.xx, so avoid the last 64kb. */
358
if (addr_max > grub_os_area_addr + grub_os_area_size)
359
addr_max = grub_os_area_addr + grub_os_area_size;
361
addr_min = (grub_addr_t) grub_linux_tmp_addr + GRUB_LINUX_CL_END_OFFSET;
363
file = grub_file_open (argv[0]);
367
size = grub_file_size (file);
369
/* Put the initrd as high as possible, 4KiB aligned. */
370
addr = (addr_max - size) & ~0xFFF;
374
grub_error (GRUB_ERR_OUT_OF_RANGE, "the initrd is too big");
378
if (grub_file_read (file, (void *) addr, size) != size)
380
grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file");
384
lh->ramdisk_image = addr;
385
lh->ramdisk_size = size;
389
grub_file_close (file);
394
static grub_command_t cmd_linux, cmd_initrd;
396
GRUB_MOD_INIT(linux16)
399
grub_register_command ("linux16", grub_cmd_linux,
400
0, N_("Load Linux."));
402
grub_register_command ("initrd16", grub_cmd_initrd,
403
0, N_("Load initrd."));
407
GRUB_MOD_FINI(linux16)
409
grub_unregister_command (cmd_linux);
410
grub_unregister_command (cmd_initrd);