xref: /openbmc/u-boot/disk/part_dos.c (revision 281ed4c7)
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->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(unsigned char, buffer, dev_desc->blksz);
93 
94 	if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
95 		return -1;
96 
97 	if (test_block_type(buffer) != DOS_MBR)
98 		return -1;
99 
100 	return 0;
101 }
102 
103 /*  Print a partition that is relative to its Extended partition table
104  */
105 static void print_partition_extended(struct blk_desc *dev_desc,
106 				     lbaint_t ext_part_sector,
107 				     lbaint_t relative,
108 				     int part_num, unsigned int disksig)
109 {
110 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
111 	dos_partition_t *pt;
112 	int i;
113 
114 	if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
115 		printf ("** Can't read partition table on %d:" LBAFU " **\n",
116 			dev_desc->devnum, ext_part_sector);
117 		return;
118 	}
119 	i=test_block_type(buffer);
120 	if (i != DOS_MBR) {
121 		printf ("bad MBR sector signature 0x%02x%02x\n",
122 			buffer[DOS_PART_MAGIC_OFFSET],
123 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
124 		return;
125 	}
126 
127 	if (!ext_part_sector)
128 		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
129 
130 	/* Print all primary/logical partitions */
131 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
132 	for (i = 0; i < 4; i++, pt++) {
133 		/*
134 		 * fdisk does not show the extended partitions that
135 		 * are not in the MBR
136 		 */
137 
138 		if ((pt->sys_ind != 0) &&
139 		    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
140 			print_one_part(pt, ext_part_sector, part_num, disksig);
141 		}
142 
143 		/* Reverse engr the fdisk part# assignment rule! */
144 		if ((ext_part_sector == 0) ||
145 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
146 			part_num++;
147 		}
148 	}
149 
150 	/* Follows the extended partitions */
151 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
152 	for (i = 0; i < 4; i++, pt++) {
153 		if (is_extended (pt->sys_ind)) {
154 			lbaint_t lba_start
155 				= le32_to_int (pt->start4) + relative;
156 
157 			print_partition_extended(dev_desc, lba_start,
158 				ext_part_sector == 0  ? lba_start : relative,
159 				part_num, disksig);
160 		}
161 	}
162 
163 	return;
164 }
165 
166 
167 /*  Print a partition that is relative to its Extended partition table
168  */
169 static int part_get_info_extended(struct blk_desc *dev_desc,
170 				  lbaint_t ext_part_sector, lbaint_t relative,
171 				  int part_num, int which_part,
172 				  disk_partition_t *info, unsigned int disksig)
173 {
174 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
175 	dos_partition_t *pt;
176 	int i;
177 	int dos_type;
178 
179 	if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
180 		printf ("** Can't read partition table on %d:" LBAFU " **\n",
181 			dev_desc->devnum, ext_part_sector);
182 		return -1;
183 	}
184 	if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
185 		buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
186 		printf ("bad MBR sector signature 0x%02x%02x\n",
187 			buffer[DOS_PART_MAGIC_OFFSET],
188 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
189 		return -1;
190 	}
191 
192 #ifdef CONFIG_PARTITION_UUIDS
193 	if (!ext_part_sector)
194 		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
195 #endif
196 
197 	/* Print all primary/logical partitions */
198 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
199 	for (i = 0; i < 4; i++, pt++) {
200 		/*
201 		 * fdisk does not show the extended partitions that
202 		 * are not in the MBR
203 		 */
204 		if (((pt->boot_ind & ~0x80) == 0) &&
205 		    (pt->sys_ind != 0) &&
206 		    (part_num == which_part) &&
207 		    (is_extended(pt->sys_ind) == 0)) {
208 			info->blksz = DOS_PART_DEFAULT_SECTOR;
209 			info->start = (lbaint_t)(ext_part_sector +
210 					le32_to_int(pt->start4));
211 			info->size  = (lbaint_t)le32_to_int(pt->size4);
212 			part_set_generic_name(dev_desc, part_num,
213 					      (char *)info->name);
214 			/* sprintf(info->type, "%d, pt->sys_ind); */
215 			strcpy((char *)info->type, "U-Boot");
216 			info->bootable = is_bootable(pt);
217 #ifdef CONFIG_PARTITION_UUIDS
218 			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
219 #endif
220 			return 0;
221 		}
222 
223 		/* Reverse engr the fdisk part# assignment rule! */
224 		if ((ext_part_sector == 0) ||
225 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
226 			part_num++;
227 		}
228 	}
229 
230 	/* Follows the extended partitions */
231 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
232 	for (i = 0; i < 4; i++, pt++) {
233 		if (is_extended (pt->sys_ind)) {
234 			lbaint_t lba_start
235 				= le32_to_int (pt->start4) + relative;
236 
237 			return part_get_info_extended(dev_desc, lba_start,
238 				 ext_part_sector == 0 ? lba_start : relative,
239 				 part_num, which_part, info, disksig);
240 		}
241 	}
242 
243 	/* Check for DOS PBR if no partition is found */
244 	dos_type = test_block_type(buffer);
245 
246 	if (dos_type == DOS_PBR) {
247 		info->start = 0;
248 		info->size = dev_desc->lba;
249 		info->blksz = DOS_PART_DEFAULT_SECTOR;
250 		info->bootable = 0;
251 		strcpy((char *)info->type, "U-Boot");
252 #ifdef CONFIG_PARTITION_UUIDS
253 		info->uuid[0] = 0;
254 #endif
255 		return 0;
256 	}
257 
258 	return -1;
259 }
260 
261 void part_print_dos(struct blk_desc *dev_desc)
262 {
263 	printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
264 	print_partition_extended(dev_desc, 0, 0, 1, 0);
265 }
266 
267 int part_get_info_dos(struct blk_desc *dev_desc, int part,
268 		      disk_partition_t *info)
269 {
270 	return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
271 }
272 
273 int is_valid_dos_buf(void *buf)
274 {
275 	return test_block_type(buf) == DOS_MBR ? 0 : -1;
276 }
277 
278 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
279 {
280 	if (is_valid_dos_buf(buf))
281 		return -1;
282 
283 	/* write MBR */
284 	if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
285 		printf("%s: failed writing '%s' (1 blks at 0x0)\n",
286 		       __func__, "MBR");
287 		return 1;
288 	}
289 
290 	return 0;
291 }
292 
293 U_BOOT_PART_TYPE(dos) = {
294 	.name		= "DOS",
295 	.part_type	= PART_TYPE_DOS,
296 	.max_entries	= DOS_ENTRY_NUMBERS,
297 	.get_info	= part_get_info_ptr(part_get_info_dos),
298 	.print		= part_print_ptr(part_print_dos),
299 	.test		= part_test_dos,
300 };
301 
302 #endif
303