disk: efi: ignore 'IGNOREME' GPT header found on cros eMMCs
[oweals/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, 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  */
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  */
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
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
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
307 int is_valid_dos_buf(void *buf)
308 {
309         return test_block_type(buf) == DOS_MBR ? 0 : -1;
310 }
311
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