xref: /openbmc/u-boot/disk/part_dos.c (revision a95aee6a) 
1 /*
2  * (C) Copyright 2001
3  * Raymond Lo, lo@routefree.com
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  *
6  * SPDX-License-Identifier:	GPL-2.0+
7  */
8 
9 /*
10  * Support for harddisk partitions.
11  *
12  * To be compatible with LinuxPPC and Apple we use the standard Apple
13  * SCSI disk partitioning scheme. For more information see:
14  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
15  */
16 
17 #include <common.h>
18 #include <command.h>
19 #include <ide.h>
20 #include <memalign.h>
21 #include "part_dos.h"
22 
23 #ifdef HAVE_BLOCK_DEVICE
24 
25 #define DOS_PART_DEFAULT_SECTOR 512
26 
27 /* Convert char[4] in little endian format to the host format integer
28  */
29 static inline unsigned int le32_to_int(unsigned char *le32)
30 {
31     return ((le32[3] << 24) +
32 	    (le32[2] << 16) +
33 	    (le32[1] << 8) +
34 	     le32[0]
35 	   );
36 }
37 
38 static inline int is_extended(int part_type)
39 {
40     return (part_type == 0x5 ||
41 	    part_type == 0xf ||
42 	    part_type == 0x85);
43 }
44 
45 static inline int is_bootable(dos_partition_t *p)
46 {
47 	return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
48 }
49 
50 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
51 			   int part_num, unsigned int disksig)
52 {
53 	lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
54 	lbaint_t lba_size  = le32_to_int (p->size4);
55 
56 	printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
57 		"u\t%08x-%02x\t%02x%s%s\n",
58 		part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
59 		(is_extended(p->sys_ind) ? " Extd" : ""),
60 		(is_bootable(p) ? " Boot" : ""));
61 }
62 
63 static int test_block_type(unsigned char *buffer)
64 {
65 	int slot;
66 	struct dos_partition *p;
67 
68 	if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
69 	    (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
70 		return (-1);
71 	} /* no DOS Signature at all */
72 	p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
73 	for (slot = 0; slot < 3; slot++) {
74 		if (p->boot_ind != 0 && p->boot_ind != 0x80) {
75 			if (!slot &&
76 			    (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
77 				     "FAT", 3) == 0 ||
78 			     strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
79 				     "FAT32", 5) == 0)) {
80 				return DOS_PBR; /* is PBR */
81 			} else {
82 				return -1;
83 			}
84 		}
85 	}
86 	return DOS_MBR;	    /* Is MBR */
87 }
88 
89 
90 static int part_test_dos(struct blk_desc *dev_desc)
91 {
92 	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz);
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 
106 	return 0;
107 }
108 
109 /*  Print a partition that is relative to its Extended partition table
110  */
111 static void print_partition_extended(struct blk_desc *dev_desc,
112 				     lbaint_t ext_part_sector,
113 				     lbaint_t relative,
114 				     int part_num, unsigned int disksig)
115 {
116 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
117 	dos_partition_t *pt;
118 	int i;
119 
120 	if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
121 		printf ("** Can't read partition table on %d:" LBAFU " **\n",
122 			dev_desc->devnum, ext_part_sector);
123 		return;
124 	}
125 	i=test_block_type(buffer);
126 	if (i != DOS_MBR) {
127 		printf ("bad MBR sector signature 0x%02x%02x\n",
128 			buffer[DOS_PART_MAGIC_OFFSET],
129 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
130 		return;
131 	}
132 
133 	if (!ext_part_sector)
134 		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
135 
136 	/* Print all primary/logical partitions */
137 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
138 	for (i = 0; i < 4; i++, pt++) {
139 		/*
140 		 * fdisk does not show the extended partitions that
141 		 * are not in the MBR
142 		 */
143 
144 		if ((pt->sys_ind != 0) &&
145 		    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
146 			print_one_part(pt, ext_part_sector, part_num, disksig);
147 		}
148 
149 		/* Reverse engr the fdisk part# assignment rule! */
150 		if ((ext_part_sector == 0) ||
151 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
152 			part_num++;
153 		}
154 	}
155 
156 	/* Follows the extended partitions */
157 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
158 	for (i = 0; i < 4; i++, pt++) {
159 		if (is_extended (pt->sys_ind)) {
160 			lbaint_t lba_start
161 				= le32_to_int (pt->start4) + relative;
162 
163 			print_partition_extended(dev_desc, lba_start,
164 				ext_part_sector == 0  ? lba_start : relative,
165 				part_num, disksig);
166 		}
167 	}
168 
169 	return;
170 }
171 
172 
173 /*  Print a partition that is relative to its Extended partition table
174  */
175 static int part_get_info_extended(struct blk_desc *dev_desc,
176 				  lbaint_t ext_part_sector, lbaint_t relative,
177 				  int part_num, int which_part,
178 				  disk_partition_t *info, unsigned int disksig)
179 {
180 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
181 	dos_partition_t *pt;
182 	int i;
183 	int dos_type;
184 
185 	if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
186 		printf ("** Can't read partition table on %d:" LBAFU " **\n",
187 			dev_desc->devnum, ext_part_sector);
188 		return -1;
189 	}
190 	if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
191 		buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
192 		printf ("bad MBR sector signature 0x%02x%02x\n",
193 			buffer[DOS_PART_MAGIC_OFFSET],
194 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
195 		return -1;
196 	}
197 
198 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
199 	if (!ext_part_sector)
200 		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
201 #endif
202 
203 	/* Print all primary/logical partitions */
204 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
205 	for (i = 0; i < 4; i++, pt++) {
206 		/*
207 		 * fdisk does not show the extended partitions that
208 		 * are not in the MBR
209 		 */
210 		if (((pt->boot_ind & ~0x80) == 0) &&
211 		    (pt->sys_ind != 0) &&
212 		    (part_num == which_part) &&
213 		    (is_extended(pt->sys_ind) == 0)) {
214 			info->blksz = DOS_PART_DEFAULT_SECTOR;
215 			info->start = (lbaint_t)(ext_part_sector +
216 					le32_to_int(pt->start4));
217 			info->size  = (lbaint_t)le32_to_int(pt->size4);
218 			part_set_generic_name(dev_desc, part_num,
219 					      (char *)info->name);
220 			/* sprintf(info->type, "%d, pt->sys_ind); */
221 			strcpy((char *)info->type, "U-Boot");
222 			info->bootable = is_bootable(pt);
223 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
224 			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
225 #endif
226 			info->sys_ind = pt->sys_ind;
227 			return 0;
228 		}
229 
230 		/* Reverse engr the fdisk part# assignment rule! */
231 		if ((ext_part_sector == 0) ||
232 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
233 			part_num++;
234 		}
235 	}
236 
237 	/* Follows the extended partitions */
238 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
239 	for (i = 0; i < 4; i++, pt++) {
240 		if (is_extended (pt->sys_ind)) {
241 			lbaint_t lba_start
242 				= le32_to_int (pt->start4) + relative;
243 
244 			return part_get_info_extended(dev_desc, lba_start,
245 				 ext_part_sector == 0 ? lba_start : relative,
246 				 part_num, which_part, info, disksig);
247 		}
248 	}
249 
250 	/* Check for DOS PBR if no partition is found */
251 	dos_type = test_block_type(buffer);
252 
253 	if (dos_type == DOS_PBR) {
254 		info->start = 0;
255 		info->size = dev_desc->lba;
256 		info->blksz = DOS_PART_DEFAULT_SECTOR;
257 		info->bootable = 0;
258 		strcpy((char *)info->type, "U-Boot");
259 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
260 		info->uuid[0] = 0;
261 #endif
262 		return 0;
263 	}
264 
265 	return -1;
266 }
267 
268 void part_print_dos(struct blk_desc *dev_desc)
269 {
270 	printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
271 	print_partition_extended(dev_desc, 0, 0, 1, 0);
272 }
273 
274 int part_get_info_dos(struct blk_desc *dev_desc, int part,
275 		      disk_partition_t *info)
276 {
277 	return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
278 }
279 
280 int is_valid_dos_buf(void *buf)
281 {
282 	return test_block_type(buf) == DOS_MBR ? 0 : -1;
283 }
284 
285 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
286 {
287 	if (is_valid_dos_buf(buf))
288 		return -1;
289 
290 	/* write MBR */
291 	if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
292 		printf("%s: failed writing '%s' (1 blks at 0x0)\n",
293 		       __func__, "MBR");
294 		return 1;
295 	}
296 
297 	return 0;
298 }
299 
300 U_BOOT_PART_TYPE(dos) = {
301 	.name		= "DOS",
302 	.part_type	= PART_TYPE_DOS,
303 	.max_entries	= DOS_ENTRY_NUMBERS,
304 	.get_info	= part_get_info_ptr(part_get_info_dos),
305 	.print		= part_print_ptr(part_print_dos),
306 	.test		= part_test_dos,
307 };
308 
309 #endif
310