xref: /openbmc/u-boot/disk/part_dos.c (revision 42392849)
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 int test_part_dos (block_dev_desc_t *dev_desc)
91 {
92 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
93 
94 	if (dev_desc->block_read(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(block_dev_desc_t *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 (dev_desc->block_read(dev_desc, ext_part_sector, 1,
115 				 (ulong *)buffer) != 1) {
116 		printf ("** Can't read partition table on %d:" LBAFU " **\n",
117 			dev_desc->dev, ext_part_sector);
118 		return;
119 	}
120 	i=test_block_type(buffer);
121 	if (i != DOS_MBR) {
122 		printf ("bad MBR sector signature 0x%02x%02x\n",
123 			buffer[DOS_PART_MAGIC_OFFSET],
124 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
125 		return;
126 	}
127 
128 	if (!ext_part_sector)
129 		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
130 
131 	/* Print all primary/logical partitions */
132 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
133 	for (i = 0; i < 4; i++, pt++) {
134 		/*
135 		 * fdisk does not show the extended partitions that
136 		 * are not in the MBR
137 		 */
138 
139 		if ((pt->sys_ind != 0) &&
140 		    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
141 			print_one_part(pt, ext_part_sector, part_num, disksig);
142 		}
143 
144 		/* Reverse engr the fdisk part# assignment rule! */
145 		if ((ext_part_sector == 0) ||
146 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
147 			part_num++;
148 		}
149 	}
150 
151 	/* Follows the extended partitions */
152 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
153 	for (i = 0; i < 4; i++, pt++) {
154 		if (is_extended (pt->sys_ind)) {
155 			lbaint_t lba_start
156 				= le32_to_int (pt->start4) + relative;
157 
158 			print_partition_extended(dev_desc, lba_start,
159 				ext_part_sector == 0  ? lba_start : relative,
160 				part_num, disksig);
161 		}
162 	}
163 
164 	return;
165 }
166 
167 
168 /*  Print a partition that is relative to its Extended partition table
169  */
170 static int get_partition_info_extended (block_dev_desc_t *dev_desc,
171 				 lbaint_t ext_part_sector,
172 				 lbaint_t relative, int part_num,
173 				 int which_part, disk_partition_t *info,
174 				 unsigned int disksig)
175 {
176 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
177 	dos_partition_t *pt;
178 	int i;
179 	int dos_type;
180 
181 	if (dev_desc->block_read(dev_desc, ext_part_sector, 1,
182 				 (ulong *)buffer) != 1) {
183 		printf ("** Can't read partition table on %d:" LBAFU " **\n",
184 			dev_desc->dev, ext_part_sector);
185 		return -1;
186 	}
187 	if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
188 		buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
189 		printf ("bad MBR sector signature 0x%02x%02x\n",
190 			buffer[DOS_PART_MAGIC_OFFSET],
191 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
192 		return -1;
193 	}
194 
195 #ifdef CONFIG_PARTITION_UUIDS
196 	if (!ext_part_sector)
197 		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
198 #endif
199 
200 	/* Print all primary/logical partitions */
201 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
202 	for (i = 0; i < 4; i++, pt++) {
203 		/*
204 		 * fdisk does not show the extended partitions that
205 		 * are not in the MBR
206 		 */
207 		if (((pt->boot_ind & ~0x80) == 0) &&
208 		    (pt->sys_ind != 0) &&
209 		    (part_num == which_part) &&
210 		    (is_extended(pt->sys_ind) == 0)) {
211 			info->blksz = DOS_PART_DEFAULT_SECTOR;
212 			info->start = (lbaint_t)(ext_part_sector +
213 					le32_to_int(pt->start4));
214 			info->size  = (lbaint_t)le32_to_int(pt->size4);
215 			switch(dev_desc->if_type) {
216 				case IF_TYPE_IDE:
217 				case IF_TYPE_SATA:
218 				case IF_TYPE_ATAPI:
219 					sprintf ((char *)info->name, "hd%c%d",
220 						'a' + dev_desc->dev, part_num);
221 					break;
222 				case IF_TYPE_SCSI:
223 					sprintf ((char *)info->name, "sd%c%d",
224 						'a' + dev_desc->dev, part_num);
225 					break;
226 				case IF_TYPE_USB:
227 					sprintf ((char *)info->name, "usbd%c%d",
228 						'a' + dev_desc->dev, part_num);
229 					break;
230 				case IF_TYPE_DOC:
231 					sprintf ((char *)info->name, "docd%c%d",
232 						'a' + dev_desc->dev, part_num);
233 					break;
234 				default:
235 					sprintf ((char *)info->name, "xx%c%d",
236 						'a' + dev_desc->dev, part_num);
237 					break;
238 			}
239 			/* sprintf(info->type, "%d, pt->sys_ind); */
240 			strcpy((char *)info->type, "U-Boot");
241 			info->bootable = is_bootable(pt);
242 #ifdef CONFIG_PARTITION_UUIDS
243 			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
244 #endif
245 			return 0;
246 		}
247 
248 		/* Reverse engr the fdisk part# assignment rule! */
249 		if ((ext_part_sector == 0) ||
250 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
251 			part_num++;
252 		}
253 	}
254 
255 	/* Follows the extended partitions */
256 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
257 	for (i = 0; i < 4; i++, pt++) {
258 		if (is_extended (pt->sys_ind)) {
259 			lbaint_t lba_start
260 				= le32_to_int (pt->start4) + relative;
261 
262 			return get_partition_info_extended (dev_desc, lba_start,
263 				 ext_part_sector == 0 ? lba_start : relative,
264 				 part_num, which_part, info, disksig);
265 		}
266 	}
267 
268 	/* Check for DOS PBR if no partition is found */
269 	dos_type = test_block_type(buffer);
270 
271 	if (dos_type == DOS_PBR) {
272 		info->start = 0;
273 		info->size = dev_desc->lba;
274 		info->blksz = DOS_PART_DEFAULT_SECTOR;
275 		info->bootable = 0;
276 		strcpy((char *)info->type, "U-Boot");
277 #ifdef CONFIG_PARTITION_UUIDS
278 		info->uuid[0] = 0;
279 #endif
280 		return 0;
281 	}
282 
283 	return -1;
284 }
285 
286 void print_part_dos (block_dev_desc_t *dev_desc)
287 {
288 	printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
289 	print_partition_extended(dev_desc, 0, 0, 1, 0);
290 }
291 
292 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
293 {
294 	return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
295 }
296 
297 
298 #endif
299