1 /* common.c - miscellaneous shared variables and routines */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 1999,2000,2001,2002,2004 Free Software Foundation, Inc.
6 * This program 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 2 of the License, or
9 * (at your option) any later version.
11 * This program 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 this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #ifdef SUPPORT_NETBOOT
29 * Shared BIOS/boot data.
32 struct multiboot_info mbi
;
33 unsigned long saved_drive
;
34 unsigned long saved_partition
;
35 unsigned long cdrom_drive
;
37 #ifdef SOLARIS_NETBOOT
38 unsigned long dhcpack_length
;
39 unsigned long dhcpack_buf
;
40 #endif /* SOLARIS_NETBOOT */
41 unsigned long saved_mem_upper
;
43 /* This saves the maximum size of extended memory (in KB). */
44 unsigned long extended_memory
;
51 grub_error_t errnum
= ERR_NONE
;
58 [ERR_BAD_ARGUMENT
] = "Invalid argument",
60 "Filename must be either an absolute pathname or blocklist",
61 [ERR_BAD_FILETYPE
] = "Bad file or directory type",
62 [ERR_BAD_GZIP_DATA
] = "Bad or corrupt data while decompressing file",
63 [ERR_BAD_GZIP_HEADER
] = "Bad or incompatible header in compressed file",
64 [ERR_BAD_PART_TABLE
] = "Partition table invalid or corrupt",
65 [ERR_BAD_VERSION
] = "Mismatched or corrupt version of stage1/stage2",
66 [ERR_BELOW_1MB
] = "Loading below 1MB is not supported",
67 [ERR_BOOT_COMMAND
] = "Kernel must be loaded before booting",
68 [ERR_BOOT_FAILURE
] = "Unknown boot failure",
69 [ERR_BOOT_FEATURES
] = "Unsupported Multiboot features requested",
70 [ERR_DEV_FORMAT
] = "Unrecognized device string",
71 [ERR_DEV_NEED_INIT
] = "Device not initialized yet",
72 [ERR_DEV_VALUES
] = "Invalid device requested",
73 [ERR_EXEC_FORMAT
] = "Invalid or unsupported executable format",
75 "Filesystem compatibility error, cannot read whole file",
76 [ERR_FILE_NOT_FOUND
] = "File not found",
77 [ERR_FSYS_CORRUPT
] = "Inconsistent filesystem structure",
78 [ERR_FSYS_MOUNT
] = "Cannot mount selected partition",
79 [ERR_GEOM
] = "Selected cylinder exceeds maximum supported by BIOS",
80 [ERR_NEED_LX_KERNEL
] = "Linux kernel must be loaded before initrd",
81 [ERR_NEED_MB_KERNEL
] = "Multiboot kernel must be loaded before modules",
82 [ERR_NO_DISK
] = "Selected disk does not exist",
83 [ERR_NO_DISK_SPACE
] = "No spare sectors on the disk",
84 [ERR_NO_PART
] = "No such partition",
85 [ERR_NUMBER_OVERFLOW
] = "Overflow while parsing number",
86 [ERR_NUMBER_PARSING
] = "Error while parsing number",
87 [ERR_OUTSIDE_PART
] = "Attempt to access block outside partition",
88 [ERR_PRIVILEGED
] = "Must be authenticated",
89 [ERR_READ
] = "Disk read error",
90 [ERR_SYMLINK_LOOP
] = "Too many symbolic links",
91 [ERR_UNALIGNED
] = "File is not sector aligned",
92 [ERR_UNRECOGNIZED
] = "Unrecognized command",
93 [ERR_WONT_FIT
] = "Selected item cannot fit into memory",
94 [ERR_WRITE
] = "Disk write error",
95 [ERR_BAD_GZIP_CRC
] = "Incorrect gunzip CRC checksum",
96 [ERR_FILESYSTEM_NOT_FOUND
] = "File System not found",
97 /* this zfs file system is not found in the pool of the device */
98 [ERR_NO_BOOTPATH
] = "No valid boot path found in the zfs label. This may be caused by attempting to boot from an off-lined device.",
99 [ERR_NEWER_VERSION
] = "Newer on-disk pool version",
100 [ERR_NOTXPM
] = "Image not in XPM graphics format",
101 [ERR_TOOMANYCOLORS
] = "Image cannot use more than 14 colors",
102 [ERR_CORRUPTXPM
] = "File contains corrupt XPM image data",
103 [ERR_NOVAR
] = "Unknown variable reference",
107 /* static for BIOS memory map fakery */
108 static struct AddrRangeDesc fakemap
[3] =
110 {20, 0, 0, MB_ARD_MEMORY
},
111 {20, 0x100000, 0, MB_ARD_MEMORY
},
112 {20, 0x1000000, 0, MB_ARD_MEMORY
}
115 /* A big problem is that the memory areas aren't guaranteed to be:
116 (1) contiguous, (2) sorted in ascending order, or (3) non-overlapping.
119 mmap_avail_at (unsigned long bottom
)
121 unsigned long long top
;
128 for (cont
= 0, addr
= mbi
.mmap_addr
;
129 addr
< mbi
.mmap_addr
+ mbi
.mmap_length
;
130 addr
+= *((unsigned long *) addr
) + 4)
132 struct AddrRangeDesc
*desc
= (struct AddrRangeDesc
*) addr
;
134 if (desc
->Type
== MB_ARD_MEMORY
135 && desc
->BaseAddr
<= top
136 && desc
->BaseAddr
+ desc
->Length
> top
)
138 top
= desc
->BaseAddr
+ desc
->Length
;
145 /* For now, GRUB assumes 32bits addresses, so... */
146 if (top
> 0xFFFFFFFF)
149 return (unsigned long) top
- bottom
;
151 #endif /* ! STAGE1_5 */
153 /* This queries for BIOS information. */
155 init_bios_info (void)
158 unsigned long cont
, memtmp
, addr
;
163 * Get information from BIOS on installed RAM.
166 mbi
.mem_lower
= get_memsize (0);
167 mbi
.mem_upper
= get_memsize (1);
171 * We need to call this somewhere before trying to put data
172 * above 1 MB, since without calling it, address line 20 will be wired
173 * to 0. Not too desirable.
178 /* Store the size of extended memory in EXTENDED_MEMORY, in order to
179 tell it to non-Multiboot OSes. */
180 extended_memory
= mbi
.mem_upper
;
183 * The "mbi.mem_upper" variable only recognizes upper memory in the
184 * first memory region. If there are multiple memory regions,
185 * the rest are reported to a Multiboot-compliant OS, but otherwise
189 addr
= get_code_end ();
190 mbi
.mmap_addr
= addr
;
196 cont
= get_mmap_entry ((void *) addr
, cont
);
198 /* If the returned buffer's length is zero, quit. */
199 if (! *((unsigned long *) addr
))
202 mbi
.mmap_length
+= *((unsigned long *) addr
) + 4;
203 addr
+= *((unsigned long *) addr
) + 4;
209 unsigned long long max_addr
;
212 * This is to get the lower memory, and upper memory (up to the
213 * first memory hole), into the "mbi.mem_{lower,upper}"
214 * elements. This is for OS's that don't care about the memory
215 * map, but might care about total RAM available.
217 mbi
.mem_lower
= mmap_avail_at (0) >> 10;
218 mbi
.mem_upper
= mmap_avail_at (0x100000) >> 10;
220 /* Find the maximum available address. Ignore any memory holes. */
221 for (max_addr
= 0, addr
= mbi
.mmap_addr
;
222 addr
< mbi
.mmap_addr
+ mbi
.mmap_length
;
223 addr
+= *((unsigned long *) addr
) + 4)
225 struct AddrRangeDesc
*desc
= (struct AddrRangeDesc
*) addr
;
227 if (desc
->Type
== MB_ARD_MEMORY
&& desc
->Length
> 0
228 && desc
->BaseAddr
+ desc
->Length
> max_addr
)
229 max_addr
= desc
->BaseAddr
+ desc
->Length
;
232 extended_memory
= (max_addr
- 0x100000) >> 10;
234 else if ((memtmp
= get_eisamemsize ()) != -1)
236 cont
= memtmp
& ~0xFFFF;
237 memtmp
= memtmp
& 0xFFFF;
240 extended_memory
= (cont
>> 10) + 0x3c00;
242 extended_memory
= memtmp
;
244 if (!cont
|| (memtmp
== 0x3c00))
245 memtmp
+= (cont
>> 10);
248 /* XXX should I do this at all ??? */
250 mbi
.mmap_addr
= (unsigned long) fakemap
;
251 mbi
.mmap_length
= sizeof (fakemap
);
252 fakemap
[0].Length
= (mbi
.mem_lower
<< 10);
253 fakemap
[1].Length
= (memtmp
<< 10);
254 fakemap
[2].Length
= cont
;
257 mbi
.mem_upper
= memtmp
;
260 saved_mem_upper
= mbi
.mem_upper
;
262 #ifdef SUPPORT_NETBOOT
263 #ifdef SOLARIS_NETBOOT
264 /* leave room for dhcpack_buf */
266 addr
+= sizeof (struct dhcp_t
);
270 /* Get the drive info. */
271 /* FIXME: This should be postponed until a Multiboot kernel actually
272 requires it, because this could slow down the start-up
274 mbi
.drives_length
= 0;
275 mbi
.drives_addr
= addr
;
277 /* For now, GRUB doesn't probe floppies, since it is trivial to map
278 floppy drives to BIOS drives. */
279 for (drive
= 0x80; drive
< 0x88; drive
++)
281 struct geometry geom
;
282 struct drive_info
*info
= (struct drive_info
*) addr
;
283 unsigned short *port
;
285 /* Get the geometry. This ensures that the drive is present. */
286 if (get_diskinfo (drive
, &geom
))
289 /* Clean out the I/O map. */
290 grub_memset ((char *) io_map
, 0,
291 IO_MAP_SIZE
* sizeof (unsigned short));
293 /* Disable to probe I/O ports temporarily, because this doesn't
294 work with some BIOSes (maybe they are too buggy). */
296 /* Track the int13 handler. */
300 /* Set the information. */
301 info
->drive_number
= drive
;
302 info
->drive_mode
= ((geom
.flags
& BIOSDISK_FLAG_LBA_EXTENSION
)
303 ? MB_DI_LBA_MODE
: MB_DI_CHS_MODE
);
304 info
->drive_cylinders
= geom
.cylinders
;
305 info
->drive_heads
= geom
.heads
;
306 info
->drive_sectors
= geom
.sectors
;
308 addr
+= sizeof (struct drive_info
);
309 for (port
= io_map
; *port
; port
++, addr
+= sizeof (unsigned short))
310 *((unsigned short *) addr
) = *port
;
312 info
->size
= addr
- (unsigned long) info
;
313 mbi
.drives_length
+= info
->size
;
316 /* Get the ROM configuration table by INT 15, AH=C0h. */
317 mbi
.config_table
= get_rom_config_table ();
319 /* Set the boot loader name. */
320 mbi
.boot_loader_name
= (unsigned long) "GNU GRUB " VERSION
;
322 /* Get the APM BIOS table. */
324 if (apm_bios_info
.version
)
325 mbi
.apm_table
= (unsigned long) &apm_bios_info
;
328 * Initialize other Multiboot Info flags.
331 mbi
.flags
= (MB_INFO_MEMORY
| MB_INFO_CMDLINE
| MB_INFO_BOOTDEV
332 | MB_INFO_DRIVE_INFO
| MB_INFO_CONFIG_TABLE
333 | MB_INFO_BOOT_LOADER_NAME
);
335 if (apm_bios_info
.version
)
336 mbi
.flags
|= MB_INFO_APM_TABLE
;
338 #endif /* STAGE1_5 */
340 /* Set boot drive and partition. */
341 saved_drive
= boot_drive
;
342 saved_partition
= install_partition
;
344 /* Set cdrom drive. */
346 struct geometry geom
;
348 /* Get the geometry. */
349 if (get_diskinfo (boot_drive
, &geom
)
350 || ! (geom
.flags
& BIOSDISK_FLAG_CDROM
))
351 cdrom_drive
= GRUB_INVALID_DRIVE
;
353 cdrom_drive
= boot_drive
;
356 /* Start main routine here. */