| 1 | /*␊ |
| 2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
| 7 | * Reserved. This file contains Original Code and/or Modifications of␊ |
| 8 | * Original Code as defined in and that are subject to the Apple Public␊ |
| 9 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
| 10 | * except in compliance with the License. Please obtain a copy of the␊ |
| 11 | * License at http://www.apple.com/publicsource and read it before using␊ |
| 12 | * this file.␊ |
| 13 | * ␊ |
| 14 | * The Original Code and all software distributed under the License are␊ |
| 15 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
| 19 | * License for the specific language governing rights and limitations␊ |
| 20 | * under the License.␊ |
| 21 | * ␊ |
| 22 | * @APPLE_LICENSE_HEADER_END@␊ |
| 23 | */␊ |
| 24 | /* ␊ |
| 25 | * Mach Operating System␊ |
| 26 | * Copyright (c) 1990 Carnegie-Mellon University␊ |
| 27 | * Copyright (c) 1989 Carnegie-Mellon University␊ |
| 28 | * Copyright (c) 1988 Carnegie-Mellon University␊ |
| 29 | * Copyright (c) 1987 Carnegie-Mellon University␊ |
| 30 | * All rights reserved. The CMU software License Agreement specifies␊ |
| 31 | * the terms and conditions for use and redistribution.␊ |
| 32 | *␊ |
| 33 | */␊ |
| 34 | /*␊ |
| 35 | * HISTORY␊ |
| 36 | * Revision 2.3 88/08/08 13:47:07 rvb␊ |
| 37 | * Allocate buffers dynamically vs statically.␊ |
| 38 | * Now b[i] and i_fs and i_buf, are allocated dynamically.␊ |
| 39 | * boot_calloc(size) allocates and zeros a buffer rounded to a NPG␊ |
| 40 | * boundary.␊ |
| 41 | * Generalize boot spec to allow, xx()/mach, xx(n,[a..h])/mach,␊ |
| 42 | * xx([a..h])/mach, ...␊ |
| 43 | * Also default "xx" if unspecified and alloc just "/mach",␊ |
| 44 | * where everything is defaulted␊ |
| 45 | * Add routine, ptol(), to parse partition letters.␊ |
| 46 | *␊ |
| 47 | */␊ |
| 48 | ␊ |
| 49 | /*␊ |
| 50 | * Copyright (c) 1982, 1986 Regents of the University of California.␊ |
| 51 | * All rights reserved. The Berkeley software License Agreement␊ |
| 52 | * specifies the terms and conditions for redistribution.␊ |
| 53 | *␊ |
| 54 | *␉@(#)sys.c␉7.1 (Berkeley) 6/5/86␊ |
| 55 | */␊ |
| 56 | ␊ |
| 57 | /* Copyright 2007 VMware Inc.␊ |
| 58 | "Preboot" ramdisk support added by David Elliott␊ |
| 59 | */␊ |
| 60 | ␊ |
| 61 | #include <AvailabilityMacros.h>␊ |
| 62 | ␊ |
| 63 | #include "libsaio.h"␊ |
| 64 | #include "boot.h"␊ |
| 65 | #include "bootstruct.h"␊ |
| 66 | #include "ramdisk.h"␊ |
| 67 | #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5␊ |
| 68 | # include <Kernel/libkern/crypto/md5.h>␊ |
| 69 | #else␊ |
| 70 | # include <sys/md5.h>␊ |
| 71 | #endif␊ |
| 72 | #include <uuid/uuid.h>␊ |
| 73 | #if 0 /* No OS X release has ever included this. */␊ |
| 74 | #include <Kernel/uuid/namespace.h>␊ |
| 75 | #else␊ |
| 76 | /* copied from uuid/namespace.h, just like BootX's fs.c does. */␊ |
| 77 | UUID_DEFINE( kFSUUIDNamespaceSHA1, 0xB3, 0xE2, 0x0F, 0x39, 0xF2, 0x92, 0x11, 0xD6, 0x97, 0xA4, 0x00, 0x30, 0x65, 0x43, 0xEC, 0xAC );␊ |
| 78 | #endif␊ |
| 79 | ␊ |
| 80 | extern int multiboot_partition;␊ |
| 81 | extern int multiboot_partition_set;␊ |
| 82 | ␊ |
| 83 | struct devsw {␊ |
| 84 | const char * name;␊ |
| 85 | // size increased from char to short to handle non-BIOS internal devices␊ |
| 86 | unsigned short biosdev;␊ |
| 87 | int type;␊ |
| 88 | };␊ |
| 89 | ␊ |
| 90 | // Device entries must be ordered by bios device numbers. ␊ |
| 91 | static struct devsw devsw[] =␊ |
| 92 | {␊ |
| 93 | { "hd", 0x80, kBIOSDevTypeHardDrive }, /* DEV_HD */␊ |
| 94 | { "en", 0xE0, kBIOSDevTypeNetwork }, /* DEV_EN */␊ |
| 95 | { "rd", 0x100, kBIOSDevTypeHardDrive },␊ |
| 96 | { "bt", 0x101, kBIOSDevTypeHardDrive }, // turbo - type for booter partition␊ |
| 97 | { 0, 0 }␊ |
| 98 | };␊ |
| 99 | ␊ |
| 100 | // Pseudo BIOS devices␊ |
| 101 | enum {␊ |
| 102 | ␉kPseudoBIOSDevRAMDisk = 0x100,␊ |
| 103 | ␉kPseudoBIOSDevBooter = 0x101␊ |
| 104 | };␊ |
| 105 | ␊ |
| 106 | /*␊ |
| 107 | * Max number of file descriptors.␊ |
| 108 | */␊ |
| 109 | #define NFILES 6␊ |
| 110 | ␊ |
| 111 | static struct iob iob[NFILES];␊ |
| 112 | ␊ |
| 113 | void * gFSLoadAddress = 0;␊ |
| 114 | ␊ |
| 115 | // Turbo - save what we think is our original BIOS boot volume if we have one 0xab␊ |
| 116 | BVRef gBIOSBootVolume = NULL;␊ |
| 117 | BVRef gBootVolume;␊ |
| 118 | ␊ |
| 119 | //static BVRef getBootVolumeRef( const char * path, const char ** outPath );␊ |
| 120 | static BVRef newBootVolumeRef( int biosdev, int partno );␊ |
| 121 | ␊ |
| 122 | //==========================================================================␊ |
| 123 | // LoadVolumeFile - LOW-LEVEL FILESYSTEM FUNCTION.␊ |
| 124 | // Load the specified file from the specified volume␊ |
| 125 | // to the load buffer at LOAD_ADDR.␊ |
| 126 | // If the file is fat, load only the i386 portion.␊ |
| 127 | ␊ |
| 128 | long LoadVolumeFile(BVRef bvr, const char *filePath)␊ |
| 129 | {␊ |
| 130 | long fileSize;␊ |
| 131 | ␊ |
| 132 | // Read file into load buffer. The data in the load buffer will be␊ |
| 133 | // overwritten by the next LoadFile() call.␊ |
| 134 | ␊ |
| 135 | gFSLoadAddress = (void *) LOAD_ADDR;␊ |
| 136 | ␊ |
| 137 | fileSize = bvr->fs_loadfile(bvr, (char *)filePath);␊ |
| 138 | ␊ |
| 139 | // Return the size of the file, or -1 if load failed.␊ |
| 140 | ␊ |
| 141 | return fileSize;␊ |
| 142 | }␊ |
| 143 | ␊ |
| 144 | //==========================================================================␊ |
| 145 | // LoadFile - LOW-LEVEL FILESYSTEM FUNCTION.␊ |
| 146 | // Load the specified file to the load buffer at LOAD_ADDR.␊ |
| 147 | // If the file is fat, load only the i386 portion.␊ |
| 148 | ␊ |
| 149 | long LoadFile(const char * fileSpec)␊ |
| 150 | {␊ |
| 151 | const char * filePath;␊ |
| 152 | BVRef bvr;␊ |
| 153 | ␊ |
| 154 | // Resolve the boot volume from the file spec.␊ |
| 155 | ␊ |
| 156 | if ((bvr = getBootVolumeRef(fileSpec, &filePath)) == NULL)␊ |
| 157 | return -1;␊ |
| 158 | ␊ |
| 159 | return LoadVolumeFile(bvr, filePath);␊ |
| 160 | }␊ |
| 161 | ␊ |
| 162 | long ReadFileAtOffset(const char * fileSpec, void *buffer, uint64_t offset, uint64_t length)␊ |
| 163 | {␊ |
| 164 | const char *filePath;␊ |
| 165 | BVRef bvr;␊ |
| 166 | ␊ |
| 167 | if ((bvr = getBootVolumeRef(fileSpec, &filePath)) == NULL)␊ |
| 168 | return -1;␊ |
| 169 | ␊ |
| 170 | if (bvr->fs_readfile == NULL)␊ |
| 171 | return -1;␊ |
| 172 | ␊ |
| 173 | return bvr->fs_readfile(bvr, (char *)filePath, buffer, offset, length);␊ |
| 174 | }␊ |
| 175 | ␊ |
| 176 | long LoadThinFatFile(const char *fileSpec, void **binary)␊ |
| 177 | {␊ |
| 178 | const char *filePath;␊ |
| 179 | FSReadFile readFile;␊ |
| 180 | BVRef bvr;␊ |
| 181 | unsigned long length, length2;␊ |
| 182 | ␊ |
| 183 | // Resolve the boot volume from the file spec.␊ |
| 184 | ␊ |
| 185 | if ((bvr = getBootVolumeRef(fileSpec, &filePath)) == NULL)␊ |
| 186 | return -1;␊ |
| 187 | ␊ |
| 188 | *binary = (void *)kLoadAddr;␊ |
| 189 | ␊ |
| 190 | // Read file into load buffer. The data in the load buffer will be␊ |
| 191 | // overwritten by the next LoadFile() call.␊ |
| 192 | ␊ |
| 193 | gFSLoadAddress = (void *) LOAD_ADDR;␊ |
| 194 | ␊ |
| 195 | readFile = bvr->fs_readfile;␊ |
| 196 | ␊ |
| 197 | if (readFile != NULL) {␊ |
| 198 | // Read the first 4096 bytes (fat header)␊ |
| 199 | length = readFile(bvr, (char *)filePath, *binary, 0, 0x1000);␊ |
| 200 | if (length > 0) {␊ |
| 201 | if (ThinFatFile(binary, &length) == 0) {␊ |
| 202 | ␉␉␉␉if (length == 0)␊ |
| 203 | ␉␉␉␉␉return 0;␊ |
| 204 | // We found a fat binary; read only the thin part␊ |
| 205 | length = readFile(bvr, (char *)filePath,␊ |
| 206 | (void *)kLoadAddr, (unsigned long)(*binary) - kLoadAddr, length);␊ |
| 207 | *binary = (void *)kLoadAddr;␊ |
| 208 | } else {␊ |
| 209 | // Not a fat binary; read the rest of the file␊ |
| 210 | length2 = readFile(bvr, (char *)filePath, (void *)(kLoadAddr + length), length, 0);␊ |
| 211 | if (length2 == -1) return -1;␊ |
| 212 | length += length2;␊ |
| 213 | }␊ |
| 214 | }␊ |
| 215 | } else {␊ |
| 216 | length = bvr->fs_loadfile(bvr, (char *)filePath);␊ |
| 217 | if (length > 0) {␊ |
| 218 | ThinFatFile(binary, &length);␊ |
| 219 | }␊ |
| 220 | }␊ |
| 221 | ␊ |
| 222 | return length;␊ |
| 223 | }␊ |
| 224 | ␊ |
| 225 | #if UNUSED␊ |
| 226 | long GetFSUUID(char *spec, char *uuidStr)␊ |
| 227 | {␊ |
| 228 | BVRef bvr;␊ |
| 229 | long rval = -1;␊ |
| 230 | const char *devSpec;␊ |
| 231 | ␊ |
| 232 | if ((bvr = getBootVolumeRef(spec, &devSpec)) == NULL)␊ |
| 233 | return -1;␊ |
| 234 | ␊ |
| 235 | if(bvr->fs_getuuid)␊ |
| 236 | rval = bvr->fs_getuuid(bvr, uuidStr);␊ |
| 237 | ␊ |
| 238 | return rval;␊ |
| 239 | }␊ |
| 240 | #endif␊ |
| 241 | ␊ |
| 242 | // filesystem-specific getUUID functions call this shared string generator␊ |
| 243 | long CreateUUIDString(uint8_t uubytes[], int nbytes, char *uuidStr)␊ |
| 244 | {␊ |
| 245 | unsigned fmtbase, fmtidx, i;␊ |
| 246 | uint8_t uuidfmt[] = { 4, 2, 2, 2, 6 };␊ |
| 247 | char *p = uuidStr;␊ |
| 248 | MD5_CTX md5c;␊ |
| 249 | uint8_t mdresult[16];␊ |
| 250 | ␊ |
| 251 | bzero(mdresult, sizeof(mdresult));␊ |
| 252 | ␊ |
| 253 | // just like AppleFileSystemDriver␊ |
| 254 | MD5Init(&md5c);␊ |
| 255 | MD5Update(&md5c, kFSUUIDNamespaceSHA1, sizeof(kFSUUIDNamespaceSHA1));␊ |
| 256 | MD5Update(&md5c, uubytes, nbytes);␊ |
| 257 | MD5Final(mdresult, &md5c);␊ |
| 258 | ␊ |
| 259 | // this UUID has been made version 3 style (i.e. via namespace)␊ |
| 260 | // see "-uuid-urn-" IETF draft (which otherwise copies byte for byte)␊ |
| 261 | mdresult[6] = 0x30 | ( mdresult[6] & 0x0F );␊ |
| 262 | mdresult[8] = 0x80 | ( mdresult[8] & 0x3F );␊ |
| 263 | ␊ |
| 264 | ␊ |
| 265 | // generate the text: e.g. 5EB1869F-C4FA-3502-BDEB-3B8ED5D87292␊ |
| 266 | i = 0; fmtbase = 0;␊ |
| 267 | for(fmtidx = 0; fmtidx < sizeof(uuidfmt); fmtidx++) {␊ |
| 268 | for(i=0; i < uuidfmt[fmtidx]; i++) {␊ |
| 269 | uint8_t byte = mdresult[fmtbase+i];␊ |
| 270 | char nib;␊ |
| 271 | ␊ |
| 272 | nib = byte >> 4;␊ |
| 273 | *p = nib + '0'; // 0x4 -> '4'␊ |
| 274 | if(*p > '9') *p = (nib - 9 + ('A'-1)); // 0xB -> 'B'␊ |
| 275 | p++;␊ |
| 276 | ␊ |
| 277 | nib = byte & 0xf;␊ |
| 278 | *p = nib + '0'; // 0x4 -> '4'␊ |
| 279 | if(*p > '9') *p = (nib - 9 + ('A'-1)); // 0xB -> 'B'␊ |
| 280 | p++;␊ |
| 281 | ␊ |
| 282 | }␊ |
| 283 | fmtbase += i;␊ |
| 284 | if(fmtidx < sizeof(uuidfmt)-1)␊ |
| 285 | *(p++) = '-';␊ |
| 286 | else␊ |
| 287 | *p = '\0';␊ |
| 288 | }␊ |
| 289 | ␊ |
| 290 | return 0;␊ |
| 291 | }␊ |
| 292 | ␊ |
| 293 | ␊ |
| 294 | //==========================================================================␊ |
| 295 | // GetDirEntry - LOW-LEVEL FILESYSTEM FUNCTION.␊ |
| 296 | // Fetch the next directory entry for the given directory.␊ |
| 297 | ␊ |
| 298 | long GetDirEntry(const char * dirSpec, long long * dirIndex, const char ** name, ␊ |
| 299 | long * flags, long * time)␊ |
| 300 | {␊ |
| 301 | const char * dirPath;␊ |
| 302 | BVRef bvr;␊ |
| 303 | ␊ |
| 304 | // Resolve the boot volume from the dir spec.␊ |
| 305 | ␊ |
| 306 | if ((bvr = getBootVolumeRef(dirSpec, &dirPath)) == NULL)␊ |
| 307 | return -1;␊ |
| 308 | ␊ |
| 309 | // Return 0 on success, or -1 if there are no additional entries.␊ |
| 310 | ␊ |
| 311 | return bvr->fs_getdirentry( bvr,␊ |
| 312 | /* dirPath */ (char *)dirPath,␊ |
| 313 | /* dirIndex */ dirIndex,␊ |
| 314 | /* dirEntry */ (char **)name, flags, time, 0, 0 );␊ |
| 315 | }␊ |
| 316 | ␊ |
| 317 | //==========================================================================␊ |
| 318 | // GetFileInfo - LOW-LEVEL FILESYSTEM FUNCTION.␊ |
| 319 | // Get attributes for the specified file.␊ |
| 320 | ␊ |
| 321 | static char* gMakeDirSpec;␊ |
| 322 | ␊ |
| 323 | long GetFileInfo(const char * dirSpec, const char * name,␊ |
| 324 | long * flags, long * time)␊ |
| 325 | {␊ |
| 326 | long long index = 0;␊ |
| 327 | const char * entryName;␊ |
| 328 | ␊ |
| 329 | if (gMakeDirSpec == 0)␊ |
| 330 | gMakeDirSpec = (char *)malloc(1024);␊ |
| 331 | ␊ |
| 332 | if (!dirSpec) {␊ |
| 333 | long idx, len;␊ |
| 334 | ␊ |
| 335 | len = strlen(name);␊ |
| 336 | ␊ |
| 337 | for (idx = len; idx && (name[idx] != '/' && name[idx] != '\\'); idx--) {}␊ |
| 338 | if (idx == 0) {␊ |
| 339 | gMakeDirSpec[0] = '/';␊ |
| 340 | gMakeDirSpec[1] = '\0';␊ |
| 341 | } else {␊ |
| 342 | idx++;␊ |
| 343 | strncpy(gMakeDirSpec, name, idx);␊ |
| 344 | name += idx;␊ |
| 345 | }␊ |
| 346 | dirSpec = gMakeDirSpec;␊ |
| 347 | }␊ |
| 348 | ␊ |
| 349 | while (GetDirEntry(dirSpec, &index, &entryName, flags, time) == 0)␊ |
| 350 | {␊ |
| 351 | if (strcmp(entryName, name) == 0)␊ |
| 352 | return 0; // success␊ |
| 353 | }␊ |
| 354 | return -1; // file not found␊ |
| 355 | }␊ |
| 356 | ␊ |
| 357 | long GetFileBlock(const char *fileSpec, unsigned long long *firstBlock)␊ |
| 358 | {␊ |
| 359 | const char * filePath;␊ |
| 360 | BVRef bvr;␊ |
| 361 | ␊ |
| 362 | // Resolve the boot volume from the file spec.␊ |
| 363 | ␊ |
| 364 | if ((bvr = getBootVolumeRef(fileSpec, &filePath)) == NULL) {␊ |
| 365 | printf("Boot volume for '%s' is bogus\n", fileSpec);␊ |
| 366 | return -1;␊ |
| 367 | }␊ |
| 368 | ␊ |
| 369 | return bvr->fs_getfileblock(bvr, (char *)filePath, firstBlock);␊ |
| 370 | }␊ |
| 371 | ␊ |
| 372 | //==========================================================================␊ |
| 373 | // GetFreeFD()␊ |
| 374 | ␊ |
| 375 | static int GetFreeFd(void)␊ |
| 376 | {␊ |
| 377 | ␉int␉fd;␊ |
| 378 | ␊ |
| 379 | ␉// Locate a free descriptor slot.␊ |
| 380 | ␉for (fd = 0; fd < NFILES; fd++) {␊ |
| 381 | ␉␉if (iob[fd].i_flgs == 0) {␊ |
| 382 | ␉␉␉return fd;␊ |
| 383 | ␉ ␉}␊ |
| 384 | ␉}␊ |
| 385 | ␉stop("Out of file descriptors");␊ |
| 386 | ␉// not reached␊ |
| 387 | ␉return -1;␊ |
| 388 | }␊ |
| 389 | ␊ |
| 390 | //==========================================================================␊ |
| 391 | // iob_from_fdesc()␊ |
| 392 | //␊ |
| 393 | // Return a pointer to an allocated 'iob' based on the file descriptor␊ |
| 394 | // provided. Returns NULL if the file descriptor given is invalid.␊ |
| 395 | ␊ |
| 396 | static struct iob * iob_from_fdesc(int fdesc)␊ |
| 397 | {␊ |
| 398 | register struct iob * io;␊ |
| 399 | ␊ |
| 400 | if (fdesc < 0 || fdesc >= NFILES ||␊ |
| 401 | ((io = &iob[fdesc])->i_flgs & F_ALLOC) == 0)␊ |
| 402 | return NULL;␊ |
| 403 | else␊ |
| 404 | return io;␊ |
| 405 | }␊ |
| 406 | ␊ |
| 407 | //==========================================================================␊ |
| 408 | // openmem()␊ |
| 409 | ␊ |
| 410 | int openmem(char * buf, int len)␊ |
| 411 | {␊ |
| 412 | int fdesc;␊ |
| 413 | struct iob * io;␊ |
| 414 | ␊ |
| 415 | fdesc = GetFreeFd();␊ |
| 416 | io = &iob[fdesc];␊ |
| 417 | bzero(io, sizeof(*io));␊ |
| 418 | ␊ |
| 419 | // Mark the descriptor as taken. Set the F_MEM flag to indicate␊ |
| 420 | // that the file buffer is provided by the caller.␊ |
| 421 | ␊ |
| 422 | io->i_flgs = F_ALLOC | F_MEM;␊ |
| 423 | io->i_buf = buf;␊ |
| 424 | io->i_filesize = len;␊ |
| 425 | ␊ |
| 426 | return fdesc;␊ |
| 427 | }␊ |
| 428 | ␊ |
| 429 | //==========================================================================␊ |
| 430 | // open() - Open the file specified by 'path' for reading.␊ |
| 431 | ␊ |
| 432 | static int open_bvr(BVRef bvr, const char *filePath, int flags)␊ |
| 433 | {␊ |
| 434 | ␉struct iob␉*io;␊ |
| 435 | ␉int␉␉fdesc;␊ |
| 436 | ␉int␉␉i;␊ |
| 437 | ␊ |
| 438 | ␉if (bvr == NULL) {␊ |
| 439 | ␉␉return -1;␊ |
| 440 | ␉}␊ |
| 441 | ␊ |
| 442 | ␉fdesc = GetFreeFd();␊ |
| 443 | ␉io = &iob[fdesc];␊ |
| 444 | ␉bzero(io, sizeof(*io));␊ |
| 445 | ␊ |
| 446 | ␉// Mark the descriptor as taken.␊ |
| 447 | ␉io->i_flgs = F_ALLOC;␊ |
| 448 | ␊ |
| 449 | ␉// Find the next available memory block in the download buffer.␊ |
| 450 | ␉io->i_buf = (char *) LOAD_ADDR;␊ |
| 451 | ␉for (i = 0; i < NFILES; i++) {␊ |
| 452 | ␉␉if ((iob[i].i_flgs != F_ALLOC) || (i == fdesc)) {␊ |
| 453 | ␉␉␉continue;␊ |
| 454 | ␉␉}␊ |
| 455 | ␉␉io->i_buf = max(iob[i].i_filesize + iob[i].i_buf, io->i_buf);␊ |
| 456 | ␉}␊ |
| 457 | ␊ |
| 458 | ␉// Load entire file into memory. Unnecessary open() calls must be avoided.␊ |
| 459 | ␉gFSLoadAddress = io->i_buf;␊ |
| 460 | ␉io->i_filesize = bvr->fs_loadfile(bvr, (char *)filePath);␊ |
| 461 | ␉if (io->i_filesize < 0) {␊ |
| 462 | ␉␉close(fdesc);␊ |
| 463 | ␉␉return -1;␊ |
| 464 | ␉}␊ |
| 465 | ␉return fdesc;␊ |
| 466 | }␊ |
| 467 | ␊ |
| 468 | int open(const char *path, int flags)␊ |
| 469 | {␊ |
| 470 | ␉const char␉*filepath;␊ |
| 471 | ␉BVRef␉␉bvr;␊ |
| 472 | ␊ |
| 473 | ␉// Resolve the boot volume from the file spec.␊ |
| 474 | ␉if ((bvr = getBootVolumeRef(path, &filepath)) != NULL) {␊ |
| 475 | ␉␉return open_bvr(bvr, filepath, flags);␊ |
| 476 | ␉}␊ |
| 477 | ␉return -1;␊ |
| 478 | }␊ |
| 479 | ␊ |
| 480 | int open_bvdev(const char *bvd, const char *path, int flags)␊ |
| 481 | {␊ |
| 482 | const struct devsw␉*dp;␊ |
| 483 | ␉const char␉␉*cp;␊ |
| 484 | ␉BVRef␉␉␉bvr;␊ |
| 485 | ␉int␉␉␉i;␊ |
| 486 | ␉int␉␉␉len;␊ |
| 487 | ␉int␉␉␉unit;␊ |
| 488 | ␉int␉␉␉partition;␊ |
| 489 | ␊ |
| 490 | ␉if ((i = open(path, flags)) >= 0) {␊ |
| 491 | ␉␉return i;␊ |
| 492 | ␉}␊ |
| 493 | ␊ |
| 494 | ␉if (bvd == NULL || (len = strlen(bvd)) < 2) {␊ |
| 495 | ␉␉return -1;␊ |
| 496 | ␉}␊ |
| 497 | ␊ |
| 498 | ␉for (dp=devsw; dp->name; dp++) {␊ |
| 499 | ␉␉if (bvd[0] == dp->name[0] && bvd[1] == dp->name[1]) {␊ |
| 500 | ␉␉␉unit = 0;␊ |
| 501 | ␉␉␉partition = 0;␊ |
| 502 | ␉␉␉/* get optional unit and partition */␊ |
| 503 | ␉␉␉if (len >= 5 && bvd[2] == '(') { /* min must be present xx(0) */␊ |
| 504 | ␉␉␉␉cp = &bvd[3];␊ |
| 505 | ␉␉␉␉i = 0;␊ |
| 506 | ␉␉␉␉while ((cp - path) < len && isdigit(*cp)) {␊ |
| 507 | ␉␉␉␉␉i = i * 10 + *cp++ - '0';␊ |
| 508 | ␉␉␉␉␉unit = i;␊ |
| 509 | ␉␉␉␉}␊ |
| 510 | ␉␉␉␉if (*cp++ == ',') {␊ |
| 511 | ␉␉␉␉␉i = 0;␊ |
| 512 | ␉␉␉␉␉while ((cp - path) < len && isdigit(*cp)) {␊ |
| 513 | ␉␉␉␉␉␉i = i * 10 + *cp++ - '0';␊ |
| 514 | ␉␉␉␉␉␉partition = i;␊ |
| 515 | ␉␉␉␉␉}␊ |
| 516 | ␉␉␉␉}␊ |
| 517 | ␉␉␉}␊ |
| 518 | ␉␉␉bvr = newBootVolumeRef(dp->biosdev + unit, partition);␊ |
| 519 | ␉␉␉return open_bvr(bvr, path, flags);␊ |
| 520 | ␉␉}␊ |
| 521 | }␊ |
| 522 | ␉return -1;␊ |
| 523 | }␊ |
| 524 | ␊ |
| 525 | //==========================================================================␊ |
| 526 | // close() - Close a file descriptor.␊ |
| 527 | ␊ |
| 528 | int close(int fdesc)␊ |
| 529 | {␊ |
| 530 | struct iob * io;␊ |
| 531 | ␊ |
| 532 | if ((io = iob_from_fdesc(fdesc)) == NULL)␊ |
| 533 | return (-1);␊ |
| 534 | ␊ |
| 535 | io->i_flgs = 0;␊ |
| 536 | ␊ |
| 537 | return 0;␊ |
| 538 | }␊ |
| 539 | ␊ |
| 540 | //==========================================================================␊ |
| 541 | // lseek() - Reposition the byte offset of the file descriptor from the␊ |
| 542 | // beginning of the file. Returns the relocated offset.␊ |
| 543 | ␊ |
| 544 | int b_lseek(int fdesc, int offset, int ptr)␊ |
| 545 | {␊ |
| 546 | struct iob * io;␊ |
| 547 | ␊ |
| 548 | if ((io = iob_from_fdesc(fdesc)) == NULL)␊ |
| 549 | return (-1);␊ |
| 550 | ␊ |
| 551 | io->i_offset = offset;␊ |
| 552 | ␊ |
| 553 | return offset;␊ |
| 554 | }␊ |
| 555 | ␊ |
| 556 | //==========================================================================␊ |
| 557 | // tell() - Returns the byte offset of the file descriptor.␊ |
| 558 | ␊ |
| 559 | int tell(int fdesc)␊ |
| 560 | {␊ |
| 561 | struct iob * io;␊ |
| 562 | ␊ |
| 563 | if ((io = iob_from_fdesc(fdesc)) == NULL)␊ |
| 564 | return 0;␊ |
| 565 | ␊ |
| 566 | return io->i_offset;␊ |
| 567 | }␊ |
| 568 | ␊ |
| 569 | //==========================================================================␊ |
| 570 | // read() - Read up to 'count' bytes of data from the file descriptor␊ |
| 571 | // into the buffer pointed to by buf.␊ |
| 572 | ␊ |
| 573 | int read(int fdesc, char * buf, int count)␊ |
| 574 | {␊ |
| 575 | struct iob * io;␊ |
| 576 | ␊ |
| 577 | if ((io = iob_from_fdesc(fdesc)) == NULL)␊ |
| 578 | return (-1);␊ |
| 579 | ␊ |
| 580 | if ((io->i_offset + count) > (unsigned int)io->i_filesize)␊ |
| 581 | count = io->i_filesize - io->i_offset;␊ |
| 582 | ␊ |
| 583 | if (count <= 0)␊ |
| 584 | return 0; // end of file␊ |
| 585 | ␊ |
| 586 | bcopy(io->i_buf + io->i_offset, buf, count);␊ |
| 587 | ␊ |
| 588 | io->i_offset += count;␊ |
| 589 | ␊ |
| 590 | return count;␊ |
| 591 | }␊ |
| 592 | ␊ |
| 593 | //==========================================================================␊ |
| 594 | // write() - Write up to 'count' bytes of data to the file descriptor␊ |
| 595 | // from the buffer pointed to by buf.␊ |
| 596 | ␊ |
| 597 | int write(int fdesc, const char * buf, int count)␊ |
| 598 | {␊ |
| 599 | struct iob * io;␊ |
| 600 | ␊ |
| 601 | if ((io = iob_from_fdesc(fdesc)) == NULL)␊ |
| 602 | return (-1);␊ |
| 603 | ␉␊ |
| 604 | if ((io->i_offset + count) > (unsigned int)io->i_filesize)␊ |
| 605 | count = io->i_filesize - io->i_offset;␊ |
| 606 | ␉␊ |
| 607 | if (count <= 0)␊ |
| 608 | return 0; // end of file␊ |
| 609 | ␉␊ |
| 610 | bcopy(buf, io->i_buf + io->i_offset, count);␊ |
| 611 | ␉␊ |
| 612 | io->i_offset += count;␊ |
| 613 | ␉␊ |
| 614 | return count;␊ |
| 615 | }␊ |
| 616 | ␊ |
| 617 | int writebyte(int fdesc, char value)␊ |
| 618 | {␊ |
| 619 | struct iob * io;␊ |
| 620 | ␊ |
| 621 | if ((io = iob_from_fdesc(fdesc)) == NULL)␊ |
| 622 | return (-1);␊ |
| 623 | ␉␊ |
| 624 | if ((io->i_offset + 1) > (unsigned int)io->i_filesize)␊ |
| 625 | return 0; // end of file␊ |
| 626 | ␉␊ |
| 627 | io->i_buf[io->i_offset++] = value;␊ |
| 628 | ␉␊ |
| 629 | return 1;␊ |
| 630 | }␊ |
| 631 | ␊ |
| 632 | int writeint(int fdesc, int value)␊ |
| 633 | {␊ |
| 634 | struct iob * io;␊ |
| 635 | ␊ |
| 636 | if ((io = iob_from_fdesc(fdesc)) == NULL)␊ |
| 637 | return (-1);␊ |
| 638 | ␉␊ |
| 639 | if ((io->i_offset + 4) > (unsigned int)io->i_filesize)␊ |
| 640 | return 0; // end of file␊ |
| 641 | ␉␊ |
| 642 | bcopy(&value, io->i_buf + io->i_offset, 4);␊ |
| 643 | ␉␊ |
| 644 | io->i_offset += 4;␊ |
| 645 | ␉␊ |
| 646 | return 4;␊ |
| 647 | }␊ |
| 648 | ␊ |
| 649 | //==========================================================================␊ |
| 650 | // file_size() - Returns the size of the file described by the file␊ |
| 651 | // descriptor.␊ |
| 652 | ␊ |
| 653 | int file_size(int fdesc)␊ |
| 654 | {␊ |
| 655 | struct iob * io;␊ |
| 656 | ␊ |
| 657 | if ((io = iob_from_fdesc(fdesc)) == 0)␊ |
| 658 | return 0;␊ |
| 659 | ␊ |
| 660 | return io->i_filesize;␊ |
| 661 | }␊ |
| 662 | ␊ |
| 663 | //==========================================================================␊ |
| 664 | ␊ |
| 665 | struct dirstuff * vol_opendir(BVRef bvr, const char * path)␊ |
| 666 | {␊ |
| 667 | struct dirstuff * dirp = 0;␊ |
| 668 | ␊ |
| 669 | dirp = (struct dirstuff *) malloc(sizeof(struct dirstuff));␊ |
| 670 | if (dirp == NULL)␊ |
| 671 | goto error;␊ |
| 672 | ␊ |
| 673 | dirp->dir_path = newString(path);␊ |
| 674 | if (dirp->dir_path == NULL)␊ |
| 675 | goto error;␊ |
| 676 | ␊ |
| 677 | dirp->dir_bvr = bvr;␊ |
| 678 | ␊ |
| 679 | return dirp;␊ |
| 680 | ␊ |
| 681 | error:␊ |
| 682 | closedir(dirp);␊ |
| 683 | return NULL;␊ |
| 684 | }␊ |
| 685 | ␊ |
| 686 | //==========================================================================␊ |
| 687 | ␊ |
| 688 | struct dirstuff * opendir(const char * path)␊ |
| 689 | {␊ |
| 690 | struct dirstuff * dirp = 0;␊ |
| 691 | const char * dirPath;␊ |
| 692 | BVRef bvr;␊ |
| 693 | ␊ |
| 694 | if ((bvr = getBootVolumeRef(path, &dirPath)) == NULL)␊ |
| 695 | goto error;␊ |
| 696 | ␊ |
| 697 | dirp = (struct dirstuff *) malloc(sizeof(struct dirstuff));␊ |
| 698 | if (dirp == NULL)␊ |
| 699 | goto error;␊ |
| 700 | ␊ |
| 701 | dirp->dir_path = newString(dirPath);␊ |
| 702 | if (dirp->dir_path == NULL)␊ |
| 703 | goto error;␊ |
| 704 | ␊ |
| 705 | dirp->dir_bvr = bvr;␊ |
| 706 | ␊ |
| 707 | return dirp;␊ |
| 708 | ␊ |
| 709 | error:␊ |
| 710 | closedir(dirp);␊ |
| 711 | return NULL;␊ |
| 712 | }␊ |
| 713 | ␊ |
| 714 | //==========================================================================␊ |
| 715 | ␊ |
| 716 | int closedir(struct dirstuff * dirp)␊ |
| 717 | {␊ |
| 718 | if (dirp) {␊ |
| 719 | if (dirp->dir_path) free(dirp->dir_path);␊ |
| 720 | free(dirp);␊ |
| 721 | }␊ |
| 722 | return 0;␊ |
| 723 | }␊ |
| 724 | ␊ |
| 725 | //==========================================================================␊ |
| 726 | ␊ |
| 727 | int readdir(struct dirstuff * dirp, const char ** name, long * flags,␊ |
| 728 | long * time)␊ |
| 729 | {␊ |
| 730 | return dirp->dir_bvr->fs_getdirentry( dirp->dir_bvr,␊ |
| 731 | /* dirPath */ dirp->dir_path,␊ |
| 732 | /* dirIndex */ &dirp->dir_index,␊ |
| 733 | /* dirEntry */ (char **)name, flags, time,␊ |
| 734 | 0, 0);␊ |
| 735 | }␊ |
| 736 | ␊ |
| 737 | //==========================================================================␊ |
| 738 | ␊ |
| 739 | int readdir_ext(struct dirstuff * dirp, const char ** name, long * flags,␊ |
| 740 | long * time, FinderInfo *finderInfo, long *infoValid)␊ |
| 741 | {␊ |
| 742 | return dirp->dir_bvr->fs_getdirentry( dirp->dir_bvr,␊ |
| 743 | /* dirPath */ dirp->dir_path,␊ |
| 744 | /* dirIndex */ &dirp->dir_index,␊ |
| 745 | /* dirEntry */ (char **)name,␊ |
| 746 | flags, time,␊ |
| 747 | finderInfo, infoValid);␊ |
| 748 | }␊ |
| 749 | ␊ |
| 750 | //==========================================================================␊ |
| 751 | ␊ |
| 752 | const char * systemConfigDir()␊ |
| 753 | {␊ |
| 754 | if (gBootFileType == kNetworkDeviceType)␊ |
| 755 | ␉return "";␊ |
| 756 | return "/Library/Preferences/SystemConfiguration";␊ |
| 757 | }␊ |
| 758 | ␊ |
| 759 | //==========================================================================␊ |
| 760 | ␊ |
| 761 | int gBootFileType;␊ |
| 762 | ␊ |
| 763 | void scanBootVolumes( int biosdev, int * count )␊ |
| 764 | {␊ |
| 765 | BVRef bvr = 0;␊ |
| 766 | ␊ |
| 767 | bvr = diskScanBootVolumes(biosdev, count);␊ |
| 768 | if (bvr == NULL)␊ |
| 769 | {␊ |
| 770 | bvr = nbpScanBootVolumes(biosdev, count);␊ |
| 771 | if (bvr != NULL)␊ |
| 772 | {␊ |
| 773 | gBootFileType = kNetworkDeviceType;␊ |
| 774 | }␊ |
| 775 | }␊ |
| 776 | else␊ |
| 777 | {␊ |
| 778 | gBootFileType = kBlockDeviceType;␊ |
| 779 | }␊ |
| 780 | }␊ |
| 781 | ␊ |
| 782 | //==========================================================================␊ |
| 783 | ␊ |
| 784 | void scanDisks(int biosdev, int *count)␊ |
| 785 | {␊ |
| 786 | #define MAX_HDD_COUNT 32␊ |
| 787 | int bvCount;␊ |
| 788 | int hd = 0;␊ |
| 789 | ␊ |
| 790 | // Testing up to MAX_HDD_COUNT hard drives.␊ |
| 791 | ␉while(!testBiosread(0x80 + hd, 0) && hd < MAX_HDD_COUNT)␊ |
| 792 | ␉{␊ |
| 793 | ␉ bvCount = 0;␊ |
| 794 | ␉ scanBootVolumes(0x80 + hd, &bvCount);␊ |
| 795 | hd++;␊ |
| 796 | ␉}␊ |
| 797 | ␊ |
| 798 | // Also scanning CD/DVD drive.␊ |
| 799 | ␉if (biosDevIsCDROM(gBIOSDev))␊ |
| 800 | ␉{␊ |
| 801 | ␉ bvCount = 0;␊ |
| 802 | ␉scanBootVolumes(gBIOSDev, &bvCount);␊ |
| 803 | ␉}␊ |
| 804 | }␊ |
| 805 | ␊ |
| 806 | //==========================================================================␊ |
| 807 | ␊ |
| 808 | BVRef selectBootVolume( BVRef chain )␊ |
| 809 | {␊ |
| 810 | ␉bool filteredChain = false;␊ |
| 811 | ␉bool foundPrimary = false;␊ |
| 812 | ␉BVRef bvr, bvr1 = 0, bvr2 = 0;␊ |
| 813 | ␉␊ |
| 814 | ␉if (chain->filtered) filteredChain = true;␊ |
| 815 | ␉␊ |
| 816 | ␉if (multiboot_partition_set)␊ |
| 817 | ␉␉for ( bvr = chain; bvr; bvr = bvr->next )␊ |
| 818 | ␉␉␉if ( bvr->part_no == multiboot_partition && bvr->biosdev == gBIOSDev ) ␊ |
| 819 | ␉␉␉␉return bvr;␊ |
| 820 | ␉␊ |
| 821 | ␉/*␊ |
| 822 | ␉ * Checking "Default Partition" key in system configuration - use format: hd(x,y) or the volume UUID -␊ |
| 823 | ␉ * to override the default selection.␊ |
| 824 | ␉ * We accept only kBVFlagSystemVolume or kBVFlagForeignBoot volumes.␊ |
| 825 | ␉ */␊ |
| 826 | ␉const char * val;␊ |
| 827 | ␉char testStr[64];␊ |
| 828 | ␉int cnt;␊ |
| 829 | ␉␊ |
| 830 | ␉if (getValueForKey(kDefaultPartition, &val, &cnt, &bootInfo->bootConfig) && cnt >= 7 && filteredChain)␊ |
| 831 | ␉{␊ |
| 832 | ␉␉for ( bvr = chain; bvr; bvr = bvr->next )␊ |
| 833 | ␉␉{␊ |
| 834 | ␉␉␉if ( bvr->biosdev >= 0x80 && bvr->biosdev < 0x100␊ |
| 835 | ␉␉␉␉&& ( bvr->flags & ( kBVFlagSystemVolume|kBVFlagForeignBoot ) ) )␊ |
| 836 | ␉␉␉{␊ |
| 837 | ␉␉␉␉// Trying to match hd(x,y) format.␊ |
| 838 | ␉␉␉␉sprintf(testStr, "hd(%d,%d)", bvr->biosdev - 0x80, bvr->part_no);␊ |
| 839 | ␉␉␉␉if (strcmp(testStr, val) == 0)␊ |
| 840 | ␉␉␉␉␉return bvr;␊ |
| 841 | ␉␉␉␉␊ |
| 842 | ␉␉␉␉// Trying to match volume UUID.␊ |
| 843 | ␉␉␉␉if (bvr->fs_getuuid && bvr->fs_getuuid(bvr, testStr) == 0 && strcmp(testStr, val) == 0)␊ |
| 844 | ␉␉␉␉␉return bvr;␊ |
| 845 | ␉␉␉}␊ |
| 846 | ␉␉}␊ |
| 847 | ␉}␊ |
| 848 | ␉␊ |
| 849 | ␉/*␊ |
| 850 | ␉ * Scannig the volume chain backwards and trying to find ␊ |
| 851 | ␉ * a HFS+ volume with valid boot record signature.␊ |
| 852 | ␉ * If not found any active partition then we will␊ |
| 853 | ␉ * select this volume as the boot volume.␊ |
| 854 | ␉ */␊ |
| 855 | ␉for ( bvr = chain; bvr; bvr = bvr->next )␊ |
| 856 | ␉{␊ |
| 857 | ␉␉if ( bvr->flags & kBVFlagPrimary && bvr->biosdev == gBIOSDev ) foundPrimary = true;␊ |
| 858 | ␉␉// zhell -- Undo a regression that was introduced from r491 to 492.␊ |
| 859 | ␉␉// if gBIOSBootVolume is set already, no change is required␊ |
| 860 | ␉␉if ( bvr->flags & (kBVFlagBootable|kBVFlagSystemVolume)␊ |
| 861 | ␉␉␉&& gBIOSBootVolume␊ |
| 862 | ␉␉␉&& (!filteredChain || (filteredChain && bvr->visible))␊ |
| 863 | ␉␉␉&& bvr->biosdev == gBIOSDev )␊ |
| 864 | ␉␉␉bvr2 = bvr;␊ |
| 865 | ␉␉// zhell -- if gBIOSBootVolume is NOT set, we use the "if" statement␊ |
| 866 | ␉␉// from r491,␊ |
| 867 | ␉␉if ( bvr->flags & kBVFlagBootable␊ |
| 868 | ␉␉␉&& ! gBIOSBootVolume␊ |
| 869 | ␉␉␉&& bvr->biosdev == gBIOSDev )␊ |
| 870 | ␉␉␉bvr2 = bvr;␊ |
| 871 | ␉} ␊ |
| 872 | ␉␊ |
| 873 | ␉␊ |
| 874 | ␉/*␊ |
| 875 | ␉ * Use the standrad method for selecting the boot volume.␊ |
| 876 | ␉ */␊ |
| 877 | ␉if (foundPrimary)␊ |
| 878 | ␉{␊ |
| 879 | ␉␉for ( bvr = chain; bvr; bvr = bvr->next )␊ |
| 880 | ␉␉{␊ |
| 881 | ␉␉␉if ( bvr->flags & kBVFlagNativeBoot && bvr->biosdev == gBIOSDev ) bvr1 = bvr;␊ |
| 882 | ␉␉␉if ( bvr->flags & kBVFlagPrimary && bvr->biosdev == gBIOSDev ) bvr2 = bvr;␊ |
| 883 | ␉␉}␊ |
| 884 | ␉}␊ |
| 885 | ␉␊ |
| 886 | ␉bvr = bvr2 ? bvr2 :␊ |
| 887 | ␉bvr1 ? bvr1 : chain;␊ |
| 888 | ␉␊ |
| 889 | ␉return bvr;␊ |
| 890 | }␊ |
| 891 | ␊ |
| 892 | //==========================================================================␊ |
| 893 | ␊ |
| 894 | #define LP '('␊ |
| 895 | #define RP ')'␊ |
| 896 | int gBIOSDev;␊ |
| 897 | ␊ |
| 898 | /*!␊ |
| 899 | This is like boot2's gBootVolume except it is for the internal use of␊ |
| 900 | libsaio to track which volume an unqualified path should be relative to.␊ |
| 901 | This replaces bootInfo->kernDev as the carrier of this information.␊ |
| 902 | */␊ |
| 903 | static BVRef gRootVolume;␊ |
| 904 | ␊ |
| 905 | void setRootVolume(BVRef volume)␊ |
| 906 | {␊ |
| 907 | gRootVolume = volume;␊ |
| 908 | // Veto non-native FS. Basically that means don't allow the root volume to␊ |
| 909 | // be set to a volume we can't read files from.␊ |
| 910 | if(gRootVolume != NULL && ((gRootVolume->flags & kBVFlagNativeBoot) == 0))␊ |
| 911 | gRootVolume = NULL;␊ |
| 912 | }␊ |
| 913 | ␊ |
| 914 | void setBootGlobals(BVRef chain)␊ |
| 915 | {␊ |
| 916 | // Record default boot device.␊ |
| 917 | gBootVolume = selectBootVolume(chain);␊ |
| 918 | ␊ |
| 919 | // turbo - Save the ORIGINAL boot volume too for loading our mkext␊ |
| 920 | if (!gBIOSBootVolume) gBIOSBootVolume = gBootVolume;␊ |
| 921 | ␊ |
| 922 | setRootVolume(gBootVolume);␉␊ |
| 923 | }␊ |
| 924 | ␊ |
| 925 | /*!␊ |
| 926 | Extracts the volume selector from the pathname, returns the selected␊ |
| 927 | BVRef, and sets *outPath to the remainder of the path.␊ |
| 928 | If the path did not include a volume selector then the current volume␊ |
| 929 | is used. When called with a volume selector the current volume␊ |
| 930 | is changed to the selected volume unless the volume selector is␊ |
| 931 | that of a ramdisk.␊ |
| 932 | */␊ |
| 933 | BVRef getBootVolumeRef( const char * path, const char ** outPath )␊ |
| 934 | {␊ |
| 935 | const char * cp;␊ |
| 936 | BVRef bvr = gRootVolume;␊ |
| 937 | int biosdev = gBIOSDev;␊ |
| 938 | ␊ |
| 939 | // Search for left parenthesis in the path specification.␊ |
| 940 | ␊ |
| 941 | for (cp = path; *cp; cp++) {␊ |
| 942 | if (*cp == LP || *cp == '/') break;␊ |
| 943 | }␊ |
| 944 | ␊ |
| 945 | if (*cp != LP) // no left paren found␊ |
| 946 | {␊ |
| 947 | // Path is using the implicit current device so if there is␊ |
| 948 | // no current device, then we must fail.␊ |
| 949 | cp = path;␊ |
| 950 | if ( gRootVolume == NULL )␊ |
| 951 | return NULL;␊ |
| 952 | }␊ |
| 953 | else if ((cp - path) == 2) // found "xx("␊ |
| 954 | {␊ |
| 955 | const struct devsw * dp;␊ |
| 956 | const char * xp = path;␊ |
| 957 | int i;␊ |
| 958 | int unit = -1;␊ |
| 959 | int part = -1;␊ |
| 960 | ␊ |
| 961 | cp++;␊ |
| 962 | ␊ |
| 963 | // Check the 2 character device name pointed by 'xp'.␊ |
| 964 | ␊ |
| 965 | for (dp = devsw; dp->name; dp++)␊ |
| 966 | {␊ |
| 967 | if ((xp[0] == dp->name[0]) && (xp[1] == dp->name[1]))␊ |
| 968 | break; // found matching entry␊ |
| 969 | }␊ |
| 970 | if (dp->name == NULL)␊ |
| 971 | {␊ |
| 972 | error("Unknown device '%c%c'\n", xp[0], xp[1]);␊ |
| 973 | return NULL;␊ |
| 974 | }␊ |
| 975 | ␊ |
| 976 | // Extract the optional unit number from the specification.␊ |
| 977 | // hd(unit) or hd(unit, part).␊ |
| 978 | ␊ |
| 979 | i = 0;␊ |
| 980 | while (*cp >= '0' && *cp <= '9')␊ |
| 981 | {␊ |
| 982 | i = i * 10 + *cp++ - '0';␊ |
| 983 | unit = i;␊ |
| 984 | }␊ |
| 985 | ␊ |
| 986 | // Unit is no longer optional and never really was.␊ |
| 987 | // If the user failed to specify it then the unit number from the previous kernDev␊ |
| 988 | // would have been used which makes little sense anyway.␊ |
| 989 | // For example, if the user did fd()/foobar and the current root device was the␊ |
| 990 | // second hard disk (i.e. unit 1) then fd() would select the second floppy drive!␊ |
| 991 | if(unit == -1)␊ |
| 992 | return NULL;␊ |
| 993 | ␊ |
| 994 | // Extract the optional partition number from the specification.␊ |
| 995 | ␊ |
| 996 | if (*cp == ',')␊ |
| 997 | part = atoi(++cp);␊ |
| 998 | ␊ |
| 999 | // If part is not specified part will be -1 whereas before it would have been␊ |
| 1000 | // whatever the last partition was which makes about zero sense if the device␊ |
| 1001 | // has been switched.␊ |
| 1002 | ␊ |
| 1003 | // Skip past the right paren.␊ |
| 1004 | ␊ |
| 1005 | for ( ; *cp && *cp != RP; cp++) /* LOOP */;␊ |
| 1006 | if (*cp == RP) cp++;␊ |
| 1007 | ␊ |
| 1008 | biosdev = dp->biosdev + unit;␊ |
| 1009 | bvr = newBootVolumeRef(biosdev, part);␊ |
| 1010 | ␊ |
| 1011 | if(bvr == NULL)␊ |
| 1012 | return NULL;␊ |
| 1013 | }␊ |
| 1014 | else␊ |
| 1015 | {␊ |
| 1016 | // Bad device specifier, skip past the right paren.␊ |
| 1017 | ␊ |
| 1018 | for ( cp++; *cp && *cp != RP; cp++) /* LOOP */;␊ |
| 1019 | if (*cp == RP) cp++;␊ |
| 1020 | // If gRootVolume was NULL, then bvr will be NULL as well which␊ |
| 1021 | // should be caught by the caller.␊ |
| 1022 | }␊ |
| 1023 | ␊ |
| 1024 | // Returns the file path following the device spec.␊ |
| 1025 | // e.g. 'hd(1,b)mach_kernel' is reduced to 'mach_kernel'.␊ |
| 1026 | ␊ |
| 1027 | *outPath = cp;␊ |
| 1028 | ␊ |
| 1029 | return bvr;␊ |
| 1030 | }␊ |
| 1031 | ␊ |
| 1032 | //==========================================================================␊ |
| 1033 | // Function name is a misnomer as scanBootVolumes usually calls diskScanBootVolumes␊ |
| 1034 | // which caches the information. So it's only allocated on the first run.␊ |
| 1035 | static BVRef newBootVolumeRef( int biosdev, int partno )␊ |
| 1036 | {␊ |
| 1037 | ␉BVRef bvr, bvr1, bvrChain;␊ |
| 1038 | ␊ |
| 1039 | ␉bvr = bvr1 = NULL;␊ |
| 1040 | ␊ |
| 1041 | // Try resolving "rd" and "bt" devices first.␊ |
| 1042 | ␉if (biosdev == kPseudoBIOSDevRAMDisk)␊ |
| 1043 | ␉{␊ |
| 1044 | ␉␉if (gRAMDiskVolume)␊ |
| 1045 | ␉␉ bvr1 = gRAMDiskVolume;␊ |
| 1046 | ␉}␊ |
| 1047 | ␉else if (biosdev == kPseudoBIOSDevBooter)␊ |
| 1048 | ␉{␊ |
| 1049 | ␉␉if (gRAMDiskVolume != NULL && gRAMDiskBTAliased)␊ |
| 1050 | ␉␉␉bvr1 = gRAMDiskVolume;␊ |
| 1051 | ␉␉else␊ |
| 1052 | ␉␉␉bvr1 = gBIOSBootVolume;␊ |
| 1053 | ␉}␊ |
| 1054 | ␉else␊ |
| 1055 | ␉{␊ |
| 1056 | ␉␉// Fetch the volume list from the device.␊ |
| 1057 | ␊ |
| 1058 | ␉␉scanBootVolumes( biosdev, NULL );␊ |
| 1059 | ␉␉bvrChain = getBVChainForBIOSDev(biosdev);␊ |
| 1060 | ␊ |
| 1061 | ␉␉// Look for a perfect match based on device and partition number.␊ |
| 1062 | ␊ |
| 1063 | ␉␉for ( bvr1 = NULL, bvr = bvrChain; bvr; bvr = bvr->next )␊ |
| 1064 | ␉␉{␊ |
| 1065 | ␉␉␉if ( ( bvr->flags & kBVFlagNativeBoot ) == 0 ) continue;␊ |
| 1066 | ␊ |
| 1067 | ␉␉␉bvr1 = bvr;␊ |
| 1068 | ␉␉␉if ( bvr->part_no == partno ) break;␊ |
| 1069 | ␉␉}␊ |
| 1070 | ␉}␊ |
| 1071 | ␊ |
| 1072 | ␉return bvr ? bvr : bvr1;␊ |
| 1073 | }␊ |
| 1074 | ␊ |
| 1075 | //==========================================================================␊ |
| 1076 | // getDeviceDescription() - Extracts unit number and partition number␊ |
| 1077 | // from bvr structure into "dw(u,p)" format.␊ |
| 1078 | int getDeviceDescription(BVRef bvr, char *str)␊ |
| 1079 | {␊ |
| 1080 | ␉const struct devsw *dp;␊ |
| 1081 | ␉␊ |
| 1082 | ␉*str = '\0';␊ |
| 1083 | ␊ |
| 1084 | ␉if (bvr)␊ |
| 1085 | ␉{␊ |
| 1086 | ␉␉for (dp = devsw; dp->name && bvr->biosdev >= dp->biosdev; dp++);␊ |
| 1087 | ␉␉dp--;␊ |
| 1088 | ␉␉if (dp->name) sprintf(str, "%s(%d,%d)", dp->name, bvr->biosdev - dp->biosdev, bvr->part_no);␊ |
| 1089 | ␉␉␊ |
| 1090 | ␉␉return true;␊ |
| 1091 | ␉}␊ |
| 1092 | ␉␊ |
| 1093 | ␉return false;␊ |
| 1094 | }␊ |
| 1095 | |
