Merge tag 'u-boot-rockchip-20190920' of https://gitlab.denx.de/u-boot/custodians...
[platform/kernel/u-boot.git] / disk / part_dos.c
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  */
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
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
48 static inline int is_bootable(dos_partition_t *p)
49 {
50         return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
51 }
52
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
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
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,
97                         DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));
98
99         if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
100                 return -1;
101
102         if (test_block_type((unsigned char *)mbr) != DOS_MBR)
103                 return -1;
104
105         if (dev_desc->sig_type == SIG_TYPE_NONE &&
106             mbr->unique_mbr_signature != 0) {
107                 dev_desc->sig_type = SIG_TYPE_MBR;
108                 dev_desc->mbr_sig = mbr->unique_mbr_signature;
109         }
110 #else
111         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
112
113         if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
114                 return -1;
115
116         if (test_block_type(buffer) != DOS_MBR)
117                 return -1;
118 #endif
119
120         return 0;
121 }
122
123 /*  Print a partition that is relative to its Extended partition table
124  */
125 static void print_partition_extended(struct blk_desc *dev_desc,
126                                      lbaint_t ext_part_sector,
127                                      lbaint_t relative,
128                                      int part_num, unsigned int disksig)
129 {
130         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
131         dos_partition_t *pt;
132         int i;
133
134         /* set a maximum recursion level */
135         if (part_num > MAX_EXT_PARTS)
136         {
137                 printf("** Nested DOS partitions detected, stopping **\n");
138                 return;
139     }
140
141         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
142                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
143                         dev_desc->devnum, ext_part_sector);
144                 return;
145         }
146         i=test_block_type(buffer);
147         if (i != DOS_MBR) {
148                 printf ("bad MBR sector signature 0x%02x%02x\n",
149                         buffer[DOS_PART_MAGIC_OFFSET],
150                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
151                 return;
152         }
153
154         if (!ext_part_sector)
155                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
156
157         /* Print all primary/logical partitions */
158         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
159         for (i = 0; i < 4; i++, pt++) {
160                 /*
161                  * fdisk does not show the extended partitions that
162                  * are not in the MBR
163                  */
164
165                 if ((pt->sys_ind != 0) &&
166                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
167                         print_one_part(pt, ext_part_sector, part_num, disksig);
168                 }
169
170                 /* Reverse engr the fdisk part# assignment rule! */
171                 if ((ext_part_sector == 0) ||
172                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
173                         part_num++;
174                 }
175         }
176
177         /* Follows the extended partitions */
178         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
179         for (i = 0; i < 4; i++, pt++) {
180                 if (is_extended (pt->sys_ind)) {
181                         lbaint_t lba_start
182                                 = le32_to_int (pt->start4) + relative;
183
184                         print_partition_extended(dev_desc, lba_start,
185                                 ext_part_sector == 0  ? lba_start : relative,
186                                 part_num, disksig);
187                 }
188         }
189
190         return;
191 }
192
193
194 /*  Print a partition that is relative to its Extended partition table
195  */
196 static int part_get_info_extended(struct blk_desc *dev_desc,
197                                   lbaint_t ext_part_sector, lbaint_t relative,
198                                   int part_num, int which_part,
199                                   disk_partition_t *info, unsigned int disksig)
200 {
201         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
202         dos_partition_t *pt;
203         int i;
204         int dos_type;
205
206         /* set a maximum recursion level */
207         if (part_num > MAX_EXT_PARTS)
208         {
209                 printf("** Nested DOS partitions detected, stopping **\n");
210                 return -1;
211     }
212
213         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
214                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
215                         dev_desc->devnum, ext_part_sector);
216                 return -1;
217         }
218         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
219                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
220                 printf ("bad MBR sector signature 0x%02x%02x\n",
221                         buffer[DOS_PART_MAGIC_OFFSET],
222                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
223                 return -1;
224         }
225
226 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
227         if (!ext_part_sector)
228                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
229 #endif
230
231         /* Print all primary/logical partitions */
232         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
233         for (i = 0; i < 4; i++, pt++) {
234                 /*
235                  * fdisk does not show the extended partitions that
236                  * are not in the MBR
237                  */
238                 if (((pt->boot_ind & ~0x80) == 0) &&
239                     (pt->sys_ind != 0) &&
240                     (part_num == which_part) &&
241                     (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
242                         info->blksz = DOS_PART_DEFAULT_SECTOR;
243                         info->start = (lbaint_t)(ext_part_sector +
244                                         le32_to_int(pt->start4));
245                         info->size  = (lbaint_t)le32_to_int(pt->size4);
246                         part_set_generic_name(dev_desc, part_num,
247                                               (char *)info->name);
248                         /* sprintf(info->type, "%d, pt->sys_ind); */
249                         strcpy((char *)info->type, "U-Boot");
250                         info->bootable = is_bootable(pt);
251 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
252                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
253 #endif
254                         info->sys_ind = pt->sys_ind;
255                         return 0;
256                 }
257
258                 /* Reverse engr the fdisk part# assignment rule! */
259                 if ((ext_part_sector == 0) ||
260                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
261                         part_num++;
262                 }
263         }
264
265         /* Follows the extended partitions */
266         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
267         for (i = 0; i < 4; i++, pt++) {
268                 if (is_extended (pt->sys_ind)) {
269                         lbaint_t lba_start
270                                 = le32_to_int (pt->start4) + relative;
271
272                         return part_get_info_extended(dev_desc, lba_start,
273                                  ext_part_sector == 0 ? lba_start : relative,
274                                  part_num, which_part, info, disksig);
275                 }
276         }
277
278         /* Check for DOS PBR if no partition is found */
279         dos_type = test_block_type(buffer);
280
281         if (dos_type == DOS_PBR) {
282                 info->start = 0;
283                 info->size = dev_desc->lba;
284                 info->blksz = DOS_PART_DEFAULT_SECTOR;
285                 info->bootable = 0;
286                 strcpy((char *)info->type, "U-Boot");
287 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
288                 info->uuid[0] = 0;
289 #endif
290                 return 0;
291         }
292
293         return -1;
294 }
295
296 void part_print_dos(struct blk_desc *dev_desc)
297 {
298         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
299         print_partition_extended(dev_desc, 0, 0, 1, 0);
300 }
301
302 int part_get_info_dos(struct blk_desc *dev_desc, int part,
303                       disk_partition_t *info)
304 {
305         return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
306 }
307
308 int is_valid_dos_buf(void *buf)
309 {
310         return test_block_type(buf) == DOS_MBR ? 0 : -1;
311 }
312
313 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
314 {
315         if (is_valid_dos_buf(buf))
316                 return -1;
317
318         /* write MBR */
319         if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
320                 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
321                        __func__, "MBR");
322                 return 1;
323         }
324
325         return 0;
326 }
327
328 U_BOOT_PART_TYPE(dos) = {
329         .name           = "DOS",
330         .part_type      = PART_TYPE_DOS,
331         .max_entries    = DOS_ENTRY_NUMBERS,
332         .get_info       = part_get_info_ptr(part_get_info_dos),
333         .print          = part_print_ptr(part_print_dos),
334         .test           = part_test_dos,
335 };
336
337 #endif