xref: /openbmc/u-boot/disk/part_dos.c (revision 702e6014)
1 /*
2  * (C) Copyright 2001
3  * Raymond Lo, lo@routefree.com
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  *
6  * See file CREDITS for list of people who contributed to this
7  * project.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of
12  * the License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22  * MA 02111-1307 USA
23  */
24 
25 /*
26  * Support for harddisk partitions.
27  *
28  * To be compatible with LinuxPPC and Apple we use the standard Apple
29  * SCSI disk partitioning scheme. For more information see:
30  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
31  */
32 
33 #include <common.h>
34 #include <command.h>
35 #include <ide.h>
36 #include "part_dos.h"
37 
38 #if defined(CONFIG_CMD_IDE) || \
39     defined(CONFIG_CMD_SATA) || \
40     defined(CONFIG_CMD_SCSI) || \
41     defined(CONFIG_CMD_USB) || \
42     defined(CONFIG_MMC) || \
43     defined(CONFIG_SYSTEMACE)
44 
45 /* Convert char[4] in little endian format to the host format integer
46  */
47 static inline int le32_to_int(unsigned char *le32)
48 {
49     return ((le32[3] << 24) +
50 	    (le32[2] << 16) +
51 	    (le32[1] << 8) +
52 	     le32[0]
53 	   );
54 }
55 
56 static inline int is_extended(int part_type)
57 {
58     return (part_type == 0x5 ||
59 	    part_type == 0xf ||
60 	    part_type == 0x85);
61 }
62 
63 static void print_one_part (dos_partition_t *p, int ext_part_sector, int part_num)
64 {
65 	int lba_start = ext_part_sector + le32_to_int (p->start4);
66 	int lba_size  = le32_to_int (p->size4);
67 
68 	printf ("%5d\t\t%10d\t%10d\t%2x%s\n",
69 		part_num, lba_start, lba_size, p->sys_ind,
70 		(is_extended (p->sys_ind) ? " Extd" : ""));
71 }
72 
73 static int test_block_type(unsigned char *buffer)
74 {
75 	if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
76 	    (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
77 		return (-1);
78 	} /* no DOS Signature at all */
79 	if (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0 ||
80 	    strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
81 		return DOS_PBR; /* is PBR */
82 	}
83 	return DOS_MBR;	    /* Is MBR */
84 }
85 
86 
87 int test_part_dos (block_dev_desc_t *dev_desc)
88 {
89 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
90 
91 	if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
92 	    (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
93 	    (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
94 		return (-1);
95 	}
96 	return (0);
97 }
98 
99 /*  Print a partition that is relative to its Extended partition table
100  */
101 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
102 							   int part_num)
103 {
104 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
105 	dos_partition_t *pt;
106 	int i;
107 
108 	if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
109 		printf ("** Can't read partition table on %d:%d **\n",
110 			dev_desc->dev, ext_part_sector);
111 		return;
112 	}
113 	i=test_block_type(buffer);
114 	if(i==-1) {
115 		printf ("bad MBR sector signature 0x%02x%02x\n",
116 			buffer[DOS_PART_MAGIC_OFFSET],
117 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
118 		return;
119 	}
120 	if(i==DOS_PBR) {
121 		printf ("    1\t\t         0\t%10ld\t%2x\n",
122 			dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
123 		return;
124 	}
125 	/* Print all primary/logical partitions */
126 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
127 	for (i = 0; i < 4; i++, pt++) {
128 		/*
129 		 * fdisk does not show the extended partitions that
130 		 * are not in the MBR
131 		 */
132 
133 		if ((pt->sys_ind != 0) &&
134 		    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
135 			print_one_part (pt, ext_part_sector, part_num);
136 		}
137 
138 		/* Reverse engr the fdisk part# assignment rule! */
139 		if ((ext_part_sector == 0) ||
140 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
141 			part_num++;
142 		}
143 	}
144 
145 	/* Follows the extended partitions */
146 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
147 	for (i = 0; i < 4; i++, pt++) {
148 		if (is_extended (pt->sys_ind)) {
149 			int lba_start = le32_to_int (pt->start4) + relative;
150 
151 			print_partition_extended (dev_desc, lba_start,
152 						  ext_part_sector == 0  ? lba_start
153 									: relative,
154 						  part_num);
155 		}
156 	}
157 
158 	return;
159 }
160 
161 
162 /*  Print a partition that is relative to its Extended partition table
163  */
164 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
165 				 int relative, int part_num,
166 				 int which_part, disk_partition_t *info)
167 {
168 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
169 	dos_partition_t *pt;
170 	int i;
171 
172 	if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
173 		printf ("** Can't read partition table on %d:%d **\n",
174 			dev_desc->dev, ext_part_sector);
175 		return -1;
176 	}
177 	if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
178 		buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
179 		printf ("bad MBR sector signature 0x%02x%02x\n",
180 			buffer[DOS_PART_MAGIC_OFFSET],
181 			buffer[DOS_PART_MAGIC_OFFSET + 1]);
182 		return -1;
183 	}
184 
185 	/* Print all primary/logical partitions */
186 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
187 	for (i = 0; i < 4; i++, pt++) {
188 		/*
189 		 * fdisk does not show the extended partitions that
190 		 * are not in the MBR
191 		 */
192 		if (((pt->boot_ind & ~0x80) == 0) &&
193 		    (pt->sys_ind != 0) &&
194 		    (part_num == which_part) &&
195 		    (is_extended(pt->sys_ind) == 0)) {
196 			info->blksz = 512;
197 			info->start = ext_part_sector + le32_to_int (pt->start4);
198 			info->size  = le32_to_int (pt->size4);
199 			switch(dev_desc->if_type) {
200 				case IF_TYPE_IDE:
201 				case IF_TYPE_SATA:
202 				case IF_TYPE_ATAPI:
203 					sprintf ((char *)info->name, "hd%c%d",
204 						'a' + dev_desc->dev, part_num);
205 					break;
206 				case IF_TYPE_SCSI:
207 					sprintf ((char *)info->name, "sd%c%d",
208 						'a' + dev_desc->dev, part_num);
209 					break;
210 				case IF_TYPE_USB:
211 					sprintf ((char *)info->name, "usbd%c%d",
212 						'a' + dev_desc->dev, part_num);
213 					break;
214 				case IF_TYPE_DOC:
215 					sprintf ((char *)info->name, "docd%c%d",
216 						'a' + dev_desc->dev, part_num);
217 					break;
218 				default:
219 					sprintf ((char *)info->name, "xx%c%d",
220 						'a' + dev_desc->dev, part_num);
221 					break;
222 			}
223 			/* sprintf(info->type, "%d, pt->sys_ind); */
224 			sprintf ((char *)info->type, "U-Boot");
225 			return 0;
226 		}
227 
228 		/* Reverse engr the fdisk part# assignment rule! */
229 		if ((ext_part_sector == 0) ||
230 		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
231 			part_num++;
232 		}
233 	}
234 
235 	/* Follows the extended partitions */
236 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
237 	for (i = 0; i < 4; i++, pt++) {
238 		if (is_extended (pt->sys_ind)) {
239 			int lba_start = le32_to_int (pt->start4) + relative;
240 
241 			return get_partition_info_extended (dev_desc, lba_start,
242 				 ext_part_sector == 0 ? lba_start : relative,
243 				 part_num, which_part, info);
244 		}
245 	}
246 	return -1;
247 }
248 
249 void print_part_dos (block_dev_desc_t *dev_desc)
250 {
251 	printf ("Partition     Start Sector     Num Sectors     Type\n");
252 	print_partition_extended (dev_desc, 0, 0, 1);
253 }
254 
255 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
256 {
257 	return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
258 }
259 
260 
261 #endif
262