1 /* common.c - miscellaneous shared variables and routines */
2 /*
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 1999,2000,2001,2002,2004 Free Software Foundation, Inc.
5 *
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.
10 *
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.
15 *
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.
19 */
20
21 #include <shared.h>
22
23 #ifdef SUPPORT_NETBOOT
24 #include <grub.h>
25 #include <bootp.h>
26 #endif
27
28 /*
29 * Shared BIOS/boot data.
30 */
31
32 struct multiboot_info mbi;
33 unsigned long saved_drive;
34 unsigned long saved_partition;
35 unsigned long cdrom_drive;
36 #ifndef STAGE1_5
37 #ifdef SOLARIS_NETBOOT
38 unsigned long dhcpack_length;
39 unsigned long dhcpack_buf;
40 #endif /* SOLARIS_NETBOOT */
41 unsigned long saved_mem_upper;
42
43 /* This saves the maximum size of extended memory (in KB). */
44 unsigned long extended_memory;
45 #endif
46
47 /*
48 * Error code stuff.
49 */
50
51 grub_error_t errnum = ERR_NONE;
52
53 #ifndef STAGE1_5
54
55 char *err_list[] =
56 {
57 [ERR_NONE] = 0,
58 [ERR_BAD_ARGUMENT] = "Invalid argument",
59 [ERR_BAD_FILENAME] =
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",
74 [ERR_FILELENGTH] =
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",
104 };
105
106
107 /* static for BIOS memory map fakery */
108 static struct AddrRangeDesc fakemap[3] =
109 {
110 {20, 0, 0, MB_ARD_MEMORY},
111 {20, 0x100000, 0, MB_ARD_MEMORY},
112 {20, 0x1000000, 0, MB_ARD_MEMORY}
113 };
114
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.
117 Thus this kludge. */
118 static unsigned long
mmap_avail_at(unsigned long bottom)119 mmap_avail_at (unsigned long bottom)
120 {
121 unsigned long long top;
122 unsigned long addr;
123 int cont;
124
125 top = bottom;
126 do
127 {
128 for (cont = 0, addr = mbi.mmap_addr;
129 addr < mbi.mmap_addr + mbi.mmap_length;
130 addr += *((unsigned long *) addr) + 4)
131 {
132 struct AddrRangeDesc *desc = (struct AddrRangeDesc *) addr;
133
134 if (desc->Type == MB_ARD_MEMORY
135 && desc->BaseAddr <= top
136 && desc->BaseAddr + desc->Length > top)
137 {
138 top = desc->BaseAddr + desc->Length;
139 cont++;
140 }
141 }
142 }
143 while (cont);
144
145 /* For now, GRUB assumes 32bits addresses, so... */
146 if (top > 0xFFFFFFFF)
147 top = 0xFFFFFFFF;
148
149 return (unsigned long) top - bottom;
150 }
151 #endif /* ! STAGE1_5 */
152
153 /* This queries for BIOS information. */
154 void
init_bios_info(void)155 init_bios_info (void)
156 {
157 #ifndef STAGE1_5
158 unsigned long cont, memtmp, addr;
159 int drive;
160 #endif
161
162 /*
163 * Get information from BIOS on installed RAM.
164 */
165
166 mbi.mem_lower = get_memsize (0);
167 mbi.mem_upper = get_memsize (1);
168
169 #ifndef STAGE1_5
170 /*
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.
174 */
175
176 gateA20 (1);
177
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;
181
182 /*
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
186 * unused by GRUB.
187 */
188
189 addr = get_code_end ();
190 mbi.mmap_addr = addr;
191 mbi.mmap_length = 0;
192 cont = 0;
193
194 do
195 {
196 cont = get_mmap_entry ((void *) addr, cont);
197
198 /* If the returned buffer's length is zero, quit. */
199 if (! *((unsigned long *) addr))
200 break;
201
202 mbi.mmap_length += *((unsigned long *) addr) + 4;
203 addr += *((unsigned long *) addr) + 4;
204 }
205 while (cont);
206
207 if (mbi.mmap_length)
208 {
209 unsigned long long max_addr;
210
211 /*
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.
216 */
217 mbi.mem_lower = mmap_avail_at (0) >> 10;
218 mbi.mem_upper = mmap_avail_at (0x100000) >> 10;
219
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)
224 {
225 struct AddrRangeDesc *desc = (struct AddrRangeDesc *) addr;
226
227 if (desc->Type == MB_ARD_MEMORY && desc->Length > 0
228 && desc->BaseAddr + desc->Length > max_addr)
229 max_addr = desc->BaseAddr + desc->Length;
230 }
231
232 extended_memory = (max_addr - 0x100000) >> 10;
233 }
234 else if ((memtmp = get_eisamemsize ()) != -1)
235 {
236 cont = memtmp & ~0xFFFF;
237 memtmp = memtmp & 0xFFFF;
238
239 if (cont != 0)
240 extended_memory = (cont >> 10) + 0x3c00;
241 else
242 extended_memory = memtmp;
243
244 if (!cont || (memtmp == 0x3c00))
245 memtmp += (cont >> 10);
246 else
247 {
248 /* XXX should I do this at all ??? */
249
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;
255 }
256
257 mbi.mem_upper = memtmp;
258 }
259
260 saved_mem_upper = mbi.mem_upper;
261
262 #ifdef SUPPORT_NETBOOT
263 #ifdef SOLARIS_NETBOOT
264 /* leave room for dhcpack_buf */
265 dhcpack_buf = addr;
266 addr += sizeof (struct dhcp_t);
267 #endif
268 #endif
269
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
273 unreasonably. */
274 mbi.drives_length = 0;
275 mbi.drives_addr = addr;
276
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++)
280 {
281 struct geometry geom;
282 struct drive_info *info = (struct drive_info *) addr;
283 unsigned short *port;
284
285 /* Get the geometry. This ensures that the drive is present. */
286 if (get_diskinfo (drive, &geom))
287 break;
288
289 /* Clean out the I/O map. */
290 grub_memset ((char *) io_map, 0,
291 IO_MAP_SIZE * sizeof (unsigned short));
292
293 /* Disable to probe I/O ports temporarily, because this doesn't
294 work with some BIOSes (maybe they are too buggy). */
295 #if 0
296 /* Track the int13 handler. */
297 track_int13 (drive);
298 #endif
299
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;
307
308 addr += sizeof (struct drive_info);
309 for (port = io_map; *port; port++, addr += sizeof (unsigned short))
310 *((unsigned short *) addr) = *port;
311
312 info->size = addr - (unsigned long) info;
313 mbi.drives_length += info->size;
314 }
315
316 /* Get the ROM configuration table by INT 15, AH=C0h. */
317 mbi.config_table = get_rom_config_table ();
318
319 /* Set the boot loader name. */
320 mbi.boot_loader_name = (unsigned long) "GNU GRUB " VERSION;
321
322 /* Get the APM BIOS table. */
323 get_apm_info ();
324 if (apm_bios_info.version)
325 mbi.apm_table = (unsigned long) &apm_bios_info;
326
327 /*
328 * Initialize other Multiboot Info flags.
329 */
330
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);
334
335 if (apm_bios_info.version)
336 mbi.flags |= MB_INFO_APM_TABLE;
337
338 #endif /* STAGE1_5 */
339
340 /* Set boot drive and partition. */
341 saved_drive = boot_drive;
342 saved_partition = install_partition;
343
344 /* Set cdrom drive. */
345 {
346 struct geometry geom;
347
348 /* Get the geometry. */
349 if (get_diskinfo (boot_drive, &geom)
350 || ! (geom.flags & BIOSDISK_FLAG_CDROM))
351 cdrom_drive = GRUB_INVALID_DRIVE;
352 else
353 cdrom_drive = boot_drive;
354 }
355
356 /* Start main routine here. */
357 cmain ();
358 }
359