1 /* $NetBSD: dkwedge_apple.c,v 1.6 2020/04/11 16:00:34 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Apple support for disk wedges 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: dkwedge_apple.c,v 1.6 2020/04/11 16:00:34 jdolecek Exp $"); 38 39 #include <sys/param.h> 40 #ifdef _KERNEL 41 #include <sys/systm.h> 42 #endif 43 #include <sys/proc.h> 44 #include <sys/errno.h> 45 #include <sys/disk.h> 46 #include <sys/vnode.h> 47 #include <sys/bitops.h> 48 #include <sys/buf.h> 49 50 #include <sys/bootblock.h> 51 52 #define SWAP16(x) ap->x = be16toh(ap->x) 53 #define SWAP32(x) ap->x = be32toh(ap->x) 54 55 #ifdef DKWEDGE_DEBUG 56 #define DPRINTF(fmt, ...) printf(fmt, __VA_ARGS__) 57 #else 58 #define DPRINTF(fmt, ...) 59 #endif 60 61 static void 62 swap_apple_drvr_descriptor(struct apple_drvr_descriptor *ap) 63 { 64 SWAP32(descBlock); 65 SWAP16(descSize); 66 SWAP16(descType); 67 } 68 69 static void 70 swap_apple_drvr_map(struct apple_drvr_map *ap) 71 { 72 uint16_t i; 73 74 SWAP16(sbSig); 75 SWAP16(sbBlockSize); 76 SWAP32(sbBlkCount); 77 SWAP16(sbDevType); 78 SWAP16(sbDevID); 79 SWAP32(sbData); 80 SWAP16(sbDrvrCount); 81 82 if (ap->sbDrvrCount >= APPLE_DRVR_MAP_MAX_DESCRIPTORS) 83 ap->sbDrvrCount = APPLE_DRVR_MAP_MAX_DESCRIPTORS; 84 85 for (i = 0; i < ap->sbDrvrCount; i++) 86 swap_apple_drvr_descriptor(&ap->sb_dd[i]); 87 } 88 89 static void 90 swap_apple_part_map_entry(struct apple_part_map_entry *ap) 91 { 92 SWAP16(pmSig); 93 SWAP16(pmSigPad); 94 SWAP32(pmMapBlkCnt); 95 SWAP32(pmPyPartStart); 96 SWAP32(pmPartBlkCnt); 97 SWAP32(pmLgDataStart); 98 SWAP32(pmDataCnt); 99 SWAP32(pmPartStatus); 100 SWAP32(pmLgBootStart); 101 SWAP32(pmBootSize); 102 SWAP32(pmBootLoad); 103 SWAP32(pmBootLoad2); 104 SWAP32(pmBootEntry); 105 SWAP32(pmBootEntry2); 106 SWAP32(pmBootCksum); 107 } 108 109 static void 110 swap_apple_blockzeroblock(struct apple_blockzeroblock *ap) 111 { 112 SWAP32(bzbMagic); 113 SWAP16(bzbBadBlockInode); 114 SWAP16(bzbFlags); 115 SWAP16(bzbReserved); 116 SWAP32(bzbCreationTime); 117 SWAP32(bzbMountTime); 118 SWAP32(bzbUMountTime); 119 } 120 121 #undef SWAP16 122 #undef SWAP32 123 124 #define ASIZE 16384 125 126 static struct { 127 const char *name; 128 const char *type; 129 } map[] = { 130 { APPLE_PART_TYPE_UNIX, DKW_PTYPE_SYSV }, 131 { APPLE_PART_TYPE_MAC, DKW_PTYPE_APPLEHFS }, 132 }; 133 134 135 static int 136 dkwedge_discover_apple(struct disk *pdk, struct vnode *vp) 137 { 138 size_t i, n; 139 int error; 140 struct buf *bp; 141 uint32_t blocksize, blockcount, offset, rsize; 142 struct apple_drvr_map *am; 143 struct apple_part_map_entry *ae; 144 struct apple_blockzeroblock ab; 145 const char *ptype; 146 147 bp = geteblk(ASIZE); 148 if ((error = dkwedge_read(pdk, vp, 0, bp->b_data, ASIZE)) != 0) { 149 DPRINTF("%s: read @%u %d\n", __func__, 0, error); 150 goto out; 151 } 152 153 am = bp->b_data; 154 swap_apple_drvr_map(am); 155 156 error = ESRCH; 157 158 if (am->sbSig != APPLE_DRVR_MAP_MAGIC) { 159 DPRINTF("%s: drvr magic %x != %x\n", __func__, am->sbSig, 160 APPLE_DRVR_MAP_MAGIC); 161 goto out; 162 } 163 164 blocksize = am->sbBlockSize; 165 166 rsize = 1 << (ilog2(MAX(sizeof(*ae), blocksize) - 1) + 1); 167 if (ASIZE < rsize) { 168 DPRINTF("%s: buffer too small %u < %u\n", __func__, ASIZE, 169 rsize); 170 goto out; 171 } 172 173 /* XXX Clamp entries at 512 for now. */ 174 blockcount = am->sbBlkCount; 175 if (blockcount > 512) { 176 aprint_error("%s: WARNING: clamping number of blocks to " 177 "512 (was %u)\n", pdk->dk_name, blockcount); 178 blockcount = 512; 179 } 180 181 ae = bp->b_data; 182 offset = blocksize; 183 for (n = 0; n < blockcount; n++, offset += rsize) { 184 DPRINTF("%s: offset %x rsize %x\n", __func__, offset, rsize); 185 if ((error = dkwedge_read(pdk, vp, offset / DEV_BSIZE, 186 bp->b_data, rsize)) != 0) { 187 DPRINTF("%s: read @%u %d\n", __func__, offset, 188 error); 189 goto out; 190 } 191 192 swap_apple_part_map_entry(ae); 193 if (ae->pmSig != APPLE_PART_MAP_ENTRY_MAGIC) { 194 DPRINTF("%s: part magic %x != %x\n", __func__, 195 ae->pmSig, APPLE_PART_MAP_ENTRY_MAGIC); 196 break; 197 } 198 199 for (i = 0; i < __arraycount(map); i++) 200 if (strcasecmp(map[i].name, ae->pmPartType) == 0) 201 break; 202 203 DPRINTF("%s: %s/%s PH=%u/%u LG=%u/%u\n", __func__, 204 ae->pmPartName, ae->pmPartType, 205 ae->pmPyPartStart, ae->pmPartBlkCnt, 206 ae->pmLgDataStart, ae->pmDataCnt); 207 208 if (i == __arraycount(map)) 209 continue; 210 211 ptype = map[i].type; 212 memcpy(&ab, ae->pmBootArgs, sizeof(ab)); 213 swap_apple_blockzeroblock(&ab); 214 if (ab.bzbMagic == APPLE_BZB_MAGIC) { 215 if (ab.bzbType == APPLE_BZB_TYPESWAP) 216 ptype = DKW_PTYPE_SWAP; 217 } 218 219 struct dkwedge_info dkw; 220 memset(&dkw, 0, sizeof(dkw)); 221 222 strlcpy(dkw.dkw_ptype, ptype, sizeof(dkw.dkw_ptype)); 223 strlcpy(dkw.dkw_parent, pdk->dk_name, sizeof(dkw.dkw_parent)); 224 dkw.dkw_offset = ae->pmPyPartStart; 225 dkw.dkw_size = ae->pmPartBlkCnt; 226 strlcpy(dkw.dkw_wname, ae->pmPartName, sizeof(dkw.dkw_wname)); 227 error = dkwedge_add(&dkw); 228 if (error == EEXIST) 229 aprint_error("%s: wedge named '%s' already " 230 "exists, manual intervention required\n", 231 pdk->dk_name, dkw.dkw_wname); 232 else if (error) 233 aprint_error("%s: error %d adding partition " 234 "%s type %s\n", pdk->dk_name, error, 235 ae->pmPartType, dkw.dkw_ptype); 236 } 237 238 out: 239 brelse(bp, 0); 240 DPRINTF("%s: return %d\n", __func__, error); 241 return error; 242 } 243 244 #ifdef _KERNEL 245 DKWEDGE_DISCOVERY_METHOD_DECL(APPLE, -5, dkwedge_discover_apple); 246 #endif 247
Indexes created Mon Oct 27 20:09:55 GMT 2025