xref: /openbmc/u-boot/disk/part_dos.c (revision 35546f6f2014282cc4f9772324b5588bd44a2938)
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  			switch(dev_desc->if_type) {
213  				case IF_TYPE_IDE:
214  				case IF_TYPE_SATA:
215  				case IF_TYPE_ATAPI:
216  					sprintf((char *)info->name, "hd%c%d",
217  						'a' + dev_desc->devnum,
218  						part_num);
219  					break;
220  				case IF_TYPE_SCSI:
221  					sprintf((char *)info->name, "sd%c%d",
222  						'a' + dev_desc->devnum,
223  						part_num);
224  					break;
225  				case IF_TYPE_USB:
226  					sprintf((char *)info->name, "usbd%c%d",
227  						'a' + dev_desc->devnum,
228  						part_num);
229  					break;
230  				case IF_TYPE_DOC:
231  					sprintf((char *)info->name, "docd%c%d",
232  						'a' + dev_desc->devnum,
233  						part_num);
234  					break;
235  				default:
236  					sprintf((char *)info->name, "xx%c%d",
237  						'a' + dev_desc->devnum,
238  						part_num);
239  					break;
240  			}
241  			/* sprintf(info->type, "%d, pt->sys_ind); */
242  			strcpy((char *)info->type, "U-Boot");
243  			info->bootable = is_bootable(pt);
244  #ifdef CONFIG_PARTITION_UUIDS
245  			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
246  #endif
247  			return 0;
248  		}
249  
250  		/* Reverse engr the fdisk part# assignment rule! */
251  		if ((ext_part_sector == 0) ||
252  		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
253  			part_num++;
254  		}
255  	}
256  
257  	/* Follows the extended partitions */
258  	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
259  	for (i = 0; i < 4; i++, pt++) {
260  		if (is_extended (pt->sys_ind)) {
261  			lbaint_t lba_start
262  				= le32_to_int (pt->start4) + relative;
263  
264  			return part_get_info_extended(dev_desc, lba_start,
265  				 ext_part_sector == 0 ? lba_start : relative,
266  				 part_num, which_part, info, disksig);
267  		}
268  	}
269  
270  	/* Check for DOS PBR if no partition is found */
271  	dos_type = test_block_type(buffer);
272  
273  	if (dos_type == DOS_PBR) {
274  		info->start = 0;
275  		info->size = dev_desc->lba;
276  		info->blksz = DOS_PART_DEFAULT_SECTOR;
277  		info->bootable = 0;
278  		strcpy((char *)info->type, "U-Boot");
279  #ifdef CONFIG_PARTITION_UUIDS
280  		info->uuid[0] = 0;
281  #endif
282  		return 0;
283  	}
284  
285  	return -1;
286  }
287  
288  void part_print_dos(struct blk_desc *dev_desc)
289  {
290  	printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
291  	print_partition_extended(dev_desc, 0, 0, 1, 0);
292  }
293  
294  int part_get_info_dos(struct blk_desc *dev_desc, int part,
295  		      disk_partition_t *info)
296  {
297  	return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
298  }
299  
300  U_BOOT_PART_TYPE(dos) = {
301  	.name		= "DOS",
302  	.part_type	= PART_TYPE_DOS,
303  	.get_info	= part_get_info_ptr(part_get_info_dos),
304  	.print		= part_print_ptr(part_print_dos),
305  	.test		= part_test_dos,
306  };
307  
308  #endif
309