1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2001
4 * Raymond Lo, lo@routefree.com
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 */
7
8 /*
9 * Support for harddisk partitions.
10 *
11 * To be compatible with LinuxPPC and Apple we use the standard Apple
12 * SCSI disk partitioning scheme. For more information see:
13 * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
14 */
15
16 #include <common.h>
17 #include <command.h>
18 #include <ide.h>
19 #include <memalign.h>
20 #include "part_dos.h"
21
22 #ifdef CONFIG_HAVE_BLOCK_DEVICE
23
24 #define DOS_PART_DEFAULT_SECTOR 512
25
26 /* should this be configurable? It looks like it's not very common at all
27 * to use large numbers of partitions */
28 #define MAX_EXT_PARTS 256
29
30 /* Convert char[4] in little endian format to the host format integer
31 */
le32_to_int(unsigned char * le32)32 static inline unsigned int le32_to_int(unsigned char *le32)
33 {
34 return ((le32[3] << 24) +
35 (le32[2] << 16) +
36 (le32[1] << 8) +
37 le32[0]
38 );
39 }
40
is_extended(int part_type)41 static inline int is_extended(int part_type)
42 {
43 return (part_type == 0x5 ||
44 part_type == 0xf ||
45 part_type == 0x85);
46 }
47
is_bootable(dos_partition_t * p)48 static inline int is_bootable(dos_partition_t *p)
49 {
50 return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
51 }
52
print_one_part(dos_partition_t * p,lbaint_t ext_part_sector,int part_num,unsigned int disksig)53 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
54 int part_num, unsigned int disksig)
55 {
56 lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
57 lbaint_t lba_size = le32_to_int (p->size4);
58
59 printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
60 "u\t%08x-%02x\t%02x%s%s\n",
61 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
62 (is_extended(p->sys_ind) ? " Extd" : ""),
63 (is_bootable(p) ? " Boot" : ""));
64 }
65
test_block_type(unsigned char * buffer)66 static int test_block_type(unsigned char *buffer)
67 {
68 int slot;
69 struct dos_partition *p;
70
71 if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
72 (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
73 return (-1);
74 } /* no DOS Signature at all */
75 p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
76 for (slot = 0; slot < 3; slot++) {
77 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
78 if (!slot &&
79 (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
80 "FAT", 3) == 0 ||
81 strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
82 "FAT32", 5) == 0)) {
83 return DOS_PBR; /* is PBR */
84 } else {
85 return -1;
86 }
87 }
88 }
89 return DOS_MBR; /* Is MBR */
90 }
91
92
part_test_dos(struct blk_desc * dev_desc)93 static int part_test_dos(struct blk_desc *dev_desc)
94 {
95 #ifndef CONFIG_SPL_BUILD
96 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1);
97
98 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
99 return -1;
100
101 if (test_block_type((unsigned char *)mbr) != DOS_MBR)
102 return -1;
103
104 if (dev_desc->sig_type == SIG_TYPE_NONE &&
105 mbr->unique_mbr_signature != 0) {
106 dev_desc->sig_type = SIG_TYPE_MBR;
107 dev_desc->mbr_sig = mbr->unique_mbr_signature;
108 }
109 #else
110 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
111
112 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
113 return -1;
114
115 if (test_block_type(buffer) != DOS_MBR)
116 return -1;
117 #endif
118
119 return 0;
120 }
121
122 /* Print a partition that is relative to its Extended partition table
123 */
print_partition_extended(struct blk_desc * dev_desc,lbaint_t ext_part_sector,lbaint_t relative,int part_num,unsigned int disksig)124 static void print_partition_extended(struct blk_desc *dev_desc,
125 lbaint_t ext_part_sector,
126 lbaint_t relative,
127 int part_num, unsigned int disksig)
128 {
129 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
130 dos_partition_t *pt;
131 int i;
132
133 /* set a maximum recursion level */
134 if (part_num > MAX_EXT_PARTS)
135 {
136 printf("** Nested DOS partitions detected, stopping **\n");
137 return;
138 }
139
140 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
141 printf ("** Can't read partition table on %d:" LBAFU " **\n",
142 dev_desc->devnum, ext_part_sector);
143 return;
144 }
145 i=test_block_type(buffer);
146 if (i != DOS_MBR) {
147 printf ("bad MBR sector signature 0x%02x%02x\n",
148 buffer[DOS_PART_MAGIC_OFFSET],
149 buffer[DOS_PART_MAGIC_OFFSET + 1]);
150 return;
151 }
152
153 if (!ext_part_sector)
154 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
155
156 /* Print all primary/logical partitions */
157 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
158 for (i = 0; i < 4; i++, pt++) {
159 /*
160 * fdisk does not show the extended partitions that
161 * are not in the MBR
162 */
163
164 if ((pt->sys_ind != 0) &&
165 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
166 print_one_part(pt, ext_part_sector, part_num, disksig);
167 }
168
169 /* Reverse engr the fdisk part# assignment rule! */
170 if ((ext_part_sector == 0) ||
171 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
172 part_num++;
173 }
174 }
175
176 /* Follows the extended partitions */
177 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
178 for (i = 0; i < 4; i++, pt++) {
179 if (is_extended (pt->sys_ind)) {
180 lbaint_t lba_start
181 = le32_to_int (pt->start4) + relative;
182
183 print_partition_extended(dev_desc, lba_start,
184 ext_part_sector == 0 ? lba_start : relative,
185 part_num, disksig);
186 }
187 }
188
189 return;
190 }
191
192
193 /* Print a partition that is relative to its Extended partition table
194 */
part_get_info_extended(struct blk_desc * dev_desc,lbaint_t ext_part_sector,lbaint_t relative,int part_num,int which_part,disk_partition_t * info,unsigned int disksig)195 static int part_get_info_extended(struct blk_desc *dev_desc,
196 lbaint_t ext_part_sector, lbaint_t relative,
197 int part_num, int which_part,
198 disk_partition_t *info, unsigned int disksig)
199 {
200 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
201 dos_partition_t *pt;
202 int i;
203 int dos_type;
204
205 /* set a maximum recursion level */
206 if (part_num > MAX_EXT_PARTS)
207 {
208 printf("** Nested DOS partitions detected, stopping **\n");
209 return -1;
210 }
211
212 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
213 printf ("** Can't read partition table on %d:" LBAFU " **\n",
214 dev_desc->devnum, ext_part_sector);
215 return -1;
216 }
217 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
218 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
219 printf ("bad MBR sector signature 0x%02x%02x\n",
220 buffer[DOS_PART_MAGIC_OFFSET],
221 buffer[DOS_PART_MAGIC_OFFSET + 1]);
222 return -1;
223 }
224
225 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
226 if (!ext_part_sector)
227 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
228 #endif
229
230 /* Print all primary/logical partitions */
231 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
232 for (i = 0; i < 4; i++, pt++) {
233 /*
234 * fdisk does not show the extended partitions that
235 * are not in the MBR
236 */
237 if (((pt->boot_ind & ~0x80) == 0) &&
238 (pt->sys_ind != 0) &&
239 (part_num == which_part) &&
240 (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
241 info->blksz = DOS_PART_DEFAULT_SECTOR;
242 info->start = (lbaint_t)(ext_part_sector +
243 le32_to_int(pt->start4));
244 info->size = (lbaint_t)le32_to_int(pt->size4);
245 part_set_generic_name(dev_desc, part_num,
246 (char *)info->name);
247 /* sprintf(info->type, "%d, pt->sys_ind); */
248 strcpy((char *)info->type, "U-Boot");
249 info->bootable = is_bootable(pt);
250 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
251 sprintf(info->uuid, "%08x-%02x", disksig, part_num);
252 #endif
253 info->sys_ind = pt->sys_ind;
254 return 0;
255 }
256
257 /* Reverse engr the fdisk part# assignment rule! */
258 if ((ext_part_sector == 0) ||
259 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
260 part_num++;
261 }
262 }
263
264 /* Follows the extended partitions */
265 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
266 for (i = 0; i < 4; i++, pt++) {
267 if (is_extended (pt->sys_ind)) {
268 lbaint_t lba_start
269 = le32_to_int (pt->start4) + relative;
270
271 return part_get_info_extended(dev_desc, lba_start,
272 ext_part_sector == 0 ? lba_start : relative,
273 part_num, which_part, info, disksig);
274 }
275 }
276
277 /* Check for DOS PBR if no partition is found */
278 dos_type = test_block_type(buffer);
279
280 if (dos_type == DOS_PBR) {
281 info->start = 0;
282 info->size = dev_desc->lba;
283 info->blksz = DOS_PART_DEFAULT_SECTOR;
284 info->bootable = 0;
285 strcpy((char *)info->type, "U-Boot");
286 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
287 info->uuid[0] = 0;
288 #endif
289 return 0;
290 }
291
292 return -1;
293 }
294
part_print_dos(struct blk_desc * dev_desc)295 void part_print_dos(struct blk_desc *dev_desc)
296 {
297 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
298 print_partition_extended(dev_desc, 0, 0, 1, 0);
299 }
300
part_get_info_dos(struct blk_desc * dev_desc,int part,disk_partition_t * info)301 int part_get_info_dos(struct blk_desc *dev_desc, int part,
302 disk_partition_t *info)
303 {
304 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
305 }
306
is_valid_dos_buf(void * buf)307 int is_valid_dos_buf(void *buf)
308 {
309 return test_block_type(buf) == DOS_MBR ? 0 : -1;
310 }
311
write_mbr_partition(struct blk_desc * dev_desc,void * buf)312 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
313 {
314 if (is_valid_dos_buf(buf))
315 return -1;
316
317 /* write MBR */
318 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
319 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
320 __func__, "MBR");
321 return 1;
322 }
323
324 return 0;
325 }
326
327 U_BOOT_PART_TYPE(dos) = {
328 .name = "DOS",
329 .part_type = PART_TYPE_DOS,
330 .max_entries = DOS_ENTRY_NUMBERS,
331 .get_info = part_get_info_ptr(part_get_info_dos),
332 .print = part_print_ptr(part_print_dos),
333 .test = part_test_dos,
334 };
335
336 #endif
337