xref: /openbmc/u-boot/disk/part_dos.c (revision dd93a8e9e688f4c448092a275bf7db3e16d21c6f)
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