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