xref: /openbmc/u-boot/disk/part_iso.c (revision 45d85f08)
1 /*
2  * (C) Copyright 2001
3  * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <common.h>
9 #include <command.h>
10 #include <asm/unaligned.h>
11 #include "part_iso.h"
12 
13 #ifdef HAVE_BLOCK_DEVICE
14 
15 /* #define	ISO_PART_DEBUG */
16 
17 #ifdef	ISO_PART_DEBUG
18 #define	PRINTF(fmt,args...)	printf (fmt ,##args)
19 #else
20 #define PRINTF(fmt,args...)
21 #endif
22 
23 /* enable this if CDs are written with the PowerPC Platform ID */
24 #undef CHECK_FOR_POWERPC_PLATTFORM
25 #define CD_SECTSIZE 2048
26 
27 static unsigned char tmpbuf[CD_SECTSIZE];
28 
29 unsigned long iso_dread(struct blk_desc *block_dev, lbaint_t start,
30                         lbaint_t blkcnt, void *buffer)
31 {
32 	unsigned long ret;
33 
34 	if (block_dev->blksz == 512) {
35 		/* Convert from 2048 to 512 sector size */
36 		start *= 4;
37 		blkcnt *= 4;
38 	}
39 
40 	ret = blk_dread(block_dev, start, blkcnt, buffer);
41 
42 	if (block_dev->blksz == 512)
43 		ret /= 4;
44 
45 	return ret;
46 }
47 
48 /* only boot records will be listed as valid partitions */
49 int part_get_info_iso_verb(struct blk_desc *dev_desc, int part_num,
50 			   disk_partition_t *info, int verb)
51 {
52 	int i,offset,entry_num;
53 	unsigned short *chksumbuf;
54 	unsigned short chksum;
55 	unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
56 	iso_boot_rec_t *pbr = (iso_boot_rec_t	*)tmpbuf; /* boot record */
57 	iso_pri_rec_t *ppr = (iso_pri_rec_t	*)tmpbuf;	/* primary desc */
58 	iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
59 	iso_init_def_entry_t *pide;
60 
61 	if ((dev_desc->blksz != CD_SECTSIZE) && (dev_desc->blksz != 512))
62 		return -1;
63 
64 	/* the first sector (sector 0x10) must be a primary volume desc */
65 	blkaddr=PVD_OFFSET;
66 	if (iso_dread(dev_desc, PVD_OFFSET, 1, (ulong *)tmpbuf) != 1)
67 		return -1;
68 	if(ppr->desctype!=0x01) {
69 		if(verb)
70 			printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
71 				dev_desc->devnum, part_num);
72 		return (-1);
73 	}
74 	if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
75 		if(verb)
76 			printf ("** Wrong ISO Ident: %s on %d:%d **\n",
77 				ppr->stand_ident, dev_desc->devnum, part_num);
78 		return (-1);
79 	}
80 	lastsect = le32_to_cpu(ppr->firstsek_LEpathtab1_LE);
81 	/* assuming same block size for all entries */
82 	info->blksz = be16_to_cpu(ppr->secsize_BE);
83 	PRINTF(" Lastsect:%08lx\n",lastsect);
84 	for(i=blkaddr;i<lastsect;i++) {
85 		PRINTF("Reading block %d\n", i);
86 		if (iso_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
87 			return -1;
88 		if(ppr->desctype==0x00)
89 			break; /* boot entry found */
90 		if(ppr->desctype==0xff) {
91 			if(verb)
92 				printf ("** No valid boot catalog found on %d:%d **\n",
93 					dev_desc->devnum, part_num);
94 			return (-1);
95 		}
96 	}
97 	/* boot entry found */
98 	if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
99 		if(verb)
100 			printf ("** Wrong El Torito ident: %s on %d:%d **\n",
101 				pbr->ident_str, dev_desc->devnum, part_num);
102 		return (-1);
103 	}
104 	bootaddr = get_unaligned_le32(pbr->pointer);
105 	PRINTF(" Boot Entry at: %08lX\n",bootaddr);
106 	if (iso_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
107 		if(verb)
108 			printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
109 				bootaddr, dev_desc->devnum, part_num);
110 		return (-1);
111 	}
112 	chksum=0;
113 	chksumbuf = (unsigned short *)tmpbuf;
114 	for(i=0;i<0x10;i++)
115 		chksum += le16_to_cpu(chksumbuf[i]);
116 	if(chksum!=0) {
117 		if(verb)
118 			printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
119 			       dev_desc->devnum, part_num);
120 		return (-1);
121 	}
122 	if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
123 		if(verb)
124 			printf ("** Key 0x55 0xAA error on %d:%d **\n",
125 				dev_desc->devnum, part_num);
126 		return(-1);
127 	}
128 #ifdef CHECK_FOR_POWERPC_PLATTFORM
129 	if(pve->platform!=0x01) {
130 		if(verb)
131 			printf ("** No PowerPC platform CD on %d:%d **\n",
132 				dev_desc->devnum, part_num);
133 		return(-1);
134 	}
135 #endif
136 	/* the validation entry seems to be ok, now search the "partition" */
137 	entry_num=1;
138 	offset=0x20;
139 	strcpy((char *)info->type, "U-Boot");
140 	switch(dev_desc->if_type) {
141 		case IF_TYPE_IDE:
142 		case IF_TYPE_SATA:
143 		case IF_TYPE_ATAPI:
144 			sprintf ((char *)info->name, "hd%c%d",
145 				'a' + dev_desc->devnum, part_num);
146 			break;
147 		case IF_TYPE_SCSI:
148 			sprintf ((char *)info->name, "sd%c%d",
149 				'a' + dev_desc->devnum, part_num);
150 			break;
151 		case IF_TYPE_USB:
152 			sprintf ((char *)info->name, "usbd%c%d",
153 				'a' + dev_desc->devnum, part_num);
154 			break;
155 		case IF_TYPE_DOC:
156 			sprintf ((char *)info->name, "docd%c%d",
157 				'a' + dev_desc->devnum, part_num);
158 			break;
159 		default:
160 			sprintf ((char *)info->name, "xx%c%d",
161 				'a' + dev_desc->devnum, part_num);
162 			break;
163 	}
164 	/* the bootcatalog (including validation Entry) is limited to 2048Bytes
165 	 * (63 boot entries + validation entry) */
166 	 while(offset<2048) {
167 		pide=(iso_init_def_entry_t *)&tmpbuf[offset];
168 		if ((pide->boot_ind==0x88) ||
169 		    (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
170 			if(entry_num==part_num) { /* part found */
171 				goto found;
172 			}
173 			entry_num++; /* count partitions Entries (boot and non bootables */
174 			offset+=0x20;
175 			continue;
176 		}
177 		if ((pide->boot_ind==0x90) ||	/* Section Header Entry */
178 		    (pide->boot_ind==0x91) ||	/* Section Header Entry (last) */
179 		    (pide->boot_ind==0x44)) {	/* Extension Indicator */
180 			offset+=0x20; /* skip unused entries */
181 		}
182 		else {
183 			if(verb)
184 				printf ("** Partition %d not found on device %d **\n",
185 					part_num, dev_desc->devnum);
186 			return(-1);
187 		}
188 	}
189 	/* if we reach this point entire sector has been
190 	 * searched w/o succsess */
191 	if(verb)
192 		printf ("** Partition %d not found on device %d **\n",
193 			part_num, dev_desc->devnum);
194 	return(-1);
195 found:
196 	if(pide->boot_ind!=0x88) {
197 		if(verb)
198 			printf("** Partition %d is not bootable on device %d **\n",
199 			       part_num, dev_desc->devnum);
200 		return (-1);
201 	}
202 	switch(pide->boot_media) {
203 		case 0x00: /* no emulation */
204 			info->size = get_unaligned_le16(pide->sec_cnt)>>2;
205 			break;
206 		case 0x01:	info->size=2400>>2; break; /* 1.2MByte Floppy */
207 		case 0x02:	info->size=2880>>2; break; /* 1.44MByte Floppy */
208 		case 0x03:	info->size=5760>>2; break; /* 2.88MByte Floppy */
209 		case 0x04:	info->size=2880>>2; break; /* dummy (HD Emulation) */
210 		default:	info->size=0; break;
211 	}
212 	newblkaddr = get_unaligned_le32(pide->rel_block_addr);
213 	info->start=newblkaddr;
214 
215 	if (dev_desc->blksz == 512) {
216 		info->size *= 4;
217 		info->start *= 4;
218 		info->blksz = 512;
219 	}
220 
221 	PRINTF(" part %d found @ %lx size %lx\n",part_num,info->start,info->size);
222 	return 0;
223 }
224 
225 static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
226 				  disk_partition_t *info)
227 {
228 	return part_get_info_iso_verb(dev_desc, part_num, info, 1);
229 }
230 
231 static void part_print_iso(struct blk_desc *dev_desc)
232 {
233 	disk_partition_t info;
234 	int i;
235 
236 	if (part_get_info_iso_verb(dev_desc, 1, &info, 0) == -1) {
237 		printf("** No boot partition found on device %d **\n",
238 		       dev_desc->devnum);
239 		return;
240 	}
241 	printf("Part   Start     Sect x Size Type\n");
242 	i=1;
243 	do {
244 		printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
245 		       i, info.start, info.size, info.blksz, info.type);
246 		i++;
247 	} while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
248 }
249 
250 static int part_test_iso(struct blk_desc *dev_desc)
251 {
252 	disk_partition_t info;
253 
254 	return part_get_info_iso_verb(dev_desc, 1, &info, 1);
255 }
256 
257 U_BOOT_PART_TYPE(iso) = {
258 	.name		= "ISO",
259 	.part_type	= PART_TYPE_ISO,
260 	.get_info	= part_get_info_iso,
261 	.print		= part_print_iso,
262 	.test		= part_test_iso,
263 };
264 #endif
265