1 /* 2 * QEMU S390 bootmap interpreter 3 * 4 * Copyright (c) 2009 Alexander Graf <agraf@suse.de> 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or (at 7 * your option) any later version. See the COPYING file in the top-level 8 * directory. 9 */ 10 11 #include "libc.h" 12 #include "s390-ccw.h" 13 #include "bootmap.h" 14 #include "virtio.h" 15 #include "bswap.h" 16 17 #ifdef DEBUG 18 /* #define DEBUG_FALLBACK */ 19 #endif 20 21 #ifdef DEBUG_FALLBACK 22 #define dputs(txt) \ 23 do { sclp_print("zipl: " txt); } while (0) 24 #else 25 #define dputs(fmt, ...) \ 26 do { } while (0) 27 #endif 28 29 /* Scratch space */ 30 static uint8_t sec[MAX_SECTOR_SIZE*4] __attribute__((__aligned__(PAGE_SIZE))); 31 32 const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION" 33 "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; 34 35 /* 36 * Match two CCWs located after PSW and eight filler bytes. 37 * From libmagic and arch/s390/kernel/head.S. 38 */ 39 const uint8_t linux_s390_magic[] = "\x02\x00\x00\x18\x60\x00\x00\x50\x02\x00" 40 "\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40" 41 "\x40\x40\x40\x40"; 42 43 static inline bool is_iso_vd_valid(IsoVolDesc *vd) 44 { 45 const uint8_t vol_desc_magic[] = "CD001"; 46 47 return !memcmp(&vd->ident[0], vol_desc_magic, 5) && 48 vd->version == 0x1 && 49 vd->type <= VOL_DESC_TYPE_PARTITION; 50 } 51 52 /*********************************************************************** 53 * IPL an ECKD DASD (CDL or LDL/CMS format) 54 */ 55 56 static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */ 57 static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr); 58 static uint8_t _s2[MAX_SECTOR_SIZE * 3] __attribute__((__aligned__(PAGE_SIZE))); 59 static void *s2_prev_blk = _s2; 60 static void *s2_cur_blk = _s2 + MAX_SECTOR_SIZE; 61 static void *s2_next_blk = _s2 + MAX_SECTOR_SIZE * 2; 62 63 static inline void verify_boot_info(BootInfo *bip) 64 { 65 IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo"); 66 IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version"); 67 IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL"); 68 IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD"); 69 IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch"); 70 IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size), 71 "Bad block size in zIPL section of the 1st record."); 72 } 73 74 static block_number_t eckd_block_num(EckdCHS *chs) 75 { 76 const uint64_t sectors = virtio_get_sectors(); 77 const uint64_t heads = virtio_get_heads(); 78 const uint64_t cylinder = chs->cylinder 79 + ((chs->head & 0xfff0) << 12); 80 const uint64_t head = chs->head & 0x000f; 81 const block_number_t block = sectors * heads * cylinder 82 + sectors * head 83 + chs->sector 84 - 1; /* block nr starts with zero */ 85 return block; 86 } 87 88 static bool eckd_valid_address(BootMapPointer *p) 89 { 90 const uint64_t head = p->eckd.chs.head & 0x000f; 91 92 if (head >= virtio_get_heads() 93 || p->eckd.chs.sector > virtio_get_sectors() 94 || p->eckd.chs.sector <= 0) { 95 return false; 96 } 97 98 if (!virtio_guessed_disk_nature() && 99 eckd_block_num(&p->eckd.chs) >= virtio_get_blocks()) { 100 return false; 101 } 102 103 return true; 104 } 105 106 static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address) 107 { 108 block_number_t block_nr; 109 int j, rc; 110 BootMapPointer *bprs = (void *)_bprs; 111 bool more_data; 112 113 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 114 read_block(blk, bprs, "BPRS read failed"); 115 116 do { 117 more_data = false; 118 for (j = 0;; j++) { 119 block_nr = eckd_block_num(&bprs[j].xeckd.bptr.chs); 120 if (is_null_block_number(block_nr)) { /* end of chunk */ 121 break; 122 } 123 124 /* we need the updated blockno for the next indirect entry 125 * in the chain, but don't want to advance address 126 */ 127 if (j == (max_bprs_entries - 1)) { 128 break; 129 } 130 131 IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size), 132 "bad chunk block size"); 133 IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr"); 134 135 if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]), 136 sizeof(EckdBlockPtr))) { 137 /* This is a "continue" pointer. 138 * This ptr should be the last one in the current 139 * script section. 140 * I.e. the next ptr must point to the unused memory area 141 */ 142 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 143 read_block(block_nr, bprs, "BPRS continuation read failed"); 144 more_data = true; 145 break; 146 } 147 148 /* Load (count+1) blocks of code at (block_nr) 149 * to memory (address). 150 */ 151 rc = virtio_read_many(block_nr, (void *)(*address), 152 bprs[j].xeckd.bptr.count+1); 153 IPL_assert(rc == 0, "code chunk read failed"); 154 155 *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size(); 156 } 157 } while (more_data); 158 return block_nr; 159 } 160 161 static bool find_zipl_boot_menu_banner(int *offset) 162 { 163 int i; 164 165 /* Menu banner starts with "zIPL" */ 166 for (i = 0; i < virtio_get_block_size() - 4; i++) { 167 if (magic_match(s2_cur_blk + i, ZIPL_MAGIC_EBCDIC)) { 168 *offset = i; 169 return true; 170 } 171 } 172 173 return false; 174 } 175 176 static int eckd_get_boot_menu_index(block_number_t s1b_block_nr) 177 { 178 block_number_t cur_block_nr; 179 block_number_t prev_block_nr = 0; 180 block_number_t next_block_nr = 0; 181 EckdStage1b *s1b = (void *)sec; 182 int banner_offset; 183 int i; 184 185 /* Get Stage1b data */ 186 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 187 read_block(s1b_block_nr, s1b, "Cannot read stage1b boot loader"); 188 189 memset(_s2, FREE_SPACE_FILLER, sizeof(_s2)); 190 191 /* Get Stage2 data */ 192 for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) { 193 cur_block_nr = eckd_block_num(&s1b->seek[i].chs); 194 195 if (!cur_block_nr) { 196 break; 197 } 198 199 read_block(cur_block_nr, s2_cur_blk, "Cannot read stage2 boot loader"); 200 201 if (find_zipl_boot_menu_banner(&banner_offset)) { 202 /* 203 * Load the adjacent blocks to account for the 204 * possibility of menu data spanning multiple blocks. 205 */ 206 if (prev_block_nr) { 207 read_block(prev_block_nr, s2_prev_blk, 208 "Cannot read stage2 boot loader"); 209 } 210 211 if (i + 1 < STAGE2_BLK_CNT_MAX) { 212 next_block_nr = eckd_block_num(&s1b->seek[i + 1].chs); 213 } 214 215 if (next_block_nr) { 216 read_block(next_block_nr, s2_next_blk, 217 "Cannot read stage2 boot loader"); 218 } 219 220 return menu_get_zipl_boot_index(s2_cur_blk + banner_offset); 221 } 222 223 prev_block_nr = cur_block_nr; 224 } 225 226 sclp_print("No zipl boot menu data found. Booting default entry."); 227 return 0; 228 } 229 230 static void run_eckd_boot_script(block_number_t bmt_block_nr, 231 block_number_t s1b_block_nr) 232 { 233 int i; 234 unsigned int loadparm = get_loadparm_index(); 235 block_number_t block_nr; 236 uint64_t address; 237 BootMapTable *bmt = (void *)sec; 238 BootMapScript *bms = (void *)sec; 239 240 if (menu_is_enabled_zipl()) { 241 loadparm = eckd_get_boot_menu_index(s1b_block_nr); 242 } 243 244 debug_print_int("loadparm", loadparm); 245 IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" 246 " maximum number of boot entries allowed"); 247 248 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 249 read_block(bmt_block_nr, sec, "Cannot read Boot Map Table"); 250 251 block_nr = eckd_block_num(&bmt->entry[loadparm].xeckd.bptr.chs); 252 IPL_assert(block_nr != -1, "Cannot find Boot Map Table Entry"); 253 254 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 255 read_block(block_nr, sec, "Cannot read Boot Map Script"); 256 257 for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD; i++) { 258 address = bms->entry[i].address.load_address; 259 block_nr = eckd_block_num(&bms->entry[i].blkptr.xeckd.bptr.chs); 260 261 do { 262 block_nr = load_eckd_segments(block_nr, &address); 263 } while (block_nr != -1); 264 } 265 266 IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC, 267 "Unknown script entry type"); 268 jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */ 269 } 270 271 static void ipl_eckd_cdl(void) 272 { 273 XEckdMbr *mbr; 274 EckdCdlIpl2 *ipl2 = (void *)sec; 275 IplVolumeLabel *vlbl = (void *)sec; 276 block_number_t bmt_block_nr, s1b_block_nr; 277 278 /* we have just read the block #0 and recognized it as "IPL1" */ 279 sclp_print("CDL\n"); 280 281 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 282 read_block(1, ipl2, "Cannot read IPL2 record at block 1"); 283 284 mbr = &ipl2->mbr; 285 IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record."); 286 IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size), 287 "Bad block size in zIPL section of IPL2 record."); 288 IPL_assert(mbr->dev_type == DEV_TYPE_ECKD, 289 "Non-ECKD device type in zIPL section of IPL2 record."); 290 291 /* save pointer to Boot Map Table */ 292 bmt_block_nr = eckd_block_num(&mbr->blockptr.xeckd.bptr.chs); 293 294 /* save pointer to Stage1b Data */ 295 s1b_block_nr = eckd_block_num(&ipl2->stage1.seek[0].chs); 296 297 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 298 read_block(2, vlbl, "Cannot read Volume Label at block 2"); 299 IPL_assert(magic_match(vlbl->key, VOL1_MAGIC), 300 "Invalid magic of volume label block"); 301 IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC), 302 "Invalid magic of volser block"); 303 print_volser(vlbl->f.volser); 304 305 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 306 /* no return */ 307 } 308 309 static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode) 310 { 311 LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */ 312 char msg[4] = { '?', '.', '\n', '\0' }; 313 314 sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL"); 315 sclp_print(" version "); 316 switch (vlbl->LDL_version) { 317 case LDL1_VERSION: 318 msg[0] = '1'; 319 break; 320 case LDL2_VERSION: 321 msg[0] = '2'; 322 break; 323 default: 324 msg[0] = vlbl->LDL_version; 325 msg[0] &= 0x0f; /* convert EBCDIC */ 326 msg[0] |= 0x30; /* to ASCII (digit) */ 327 msg[1] = '?'; 328 break; 329 } 330 sclp_print(msg); 331 print_volser(vlbl->volser); 332 } 333 334 static void ipl_eckd_ldl(ECKD_IPL_mode_t mode) 335 { 336 block_number_t bmt_block_nr, s1b_block_nr; 337 EckdLdlIpl1 *ipl1 = (void *)sec; 338 339 if (mode != ECKD_LDL_UNLABELED) { 340 print_eckd_ldl_msg(mode); 341 } 342 343 /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */ 344 345 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 346 read_block(0, sec, "Cannot read block 0 to grab boot info."); 347 if (mode == ECKD_LDL_UNLABELED) { 348 if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) { 349 return; /* not applicable layout */ 350 } 351 sclp_print("unlabeled LDL.\n"); 352 } 353 verify_boot_info(&ipl1->bip); 354 355 /* save pointer to Boot Map Table */ 356 bmt_block_nr = eckd_block_num(&ipl1->bip.bp.ipl.bm_ptr.eckd.bptr.chs); 357 358 /* save pointer to Stage1b Data */ 359 s1b_block_nr = eckd_block_num(&ipl1->stage1.seek[0].chs); 360 361 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 362 /* no return */ 363 } 364 365 static void print_eckd_msg(void) 366 { 367 char msg[] = "Using ECKD scheme (block size *****), "; 368 char *p = &msg[34], *q = &msg[30]; 369 int n = virtio_get_block_size(); 370 371 /* Fill in the block size and show up the message */ 372 if (n > 0 && n <= 99999) { 373 while (n) { 374 *p-- = '0' + (n % 10); 375 n /= 10; 376 } 377 while (p >= q) { 378 *p-- = ' '; 379 } 380 } 381 sclp_print(msg); 382 } 383 384 static void ipl_eckd(void) 385 { 386 XEckdMbr *mbr = (void *)sec; 387 LDL_VTOC *vlbl = (void *)sec; 388 389 print_eckd_msg(); 390 391 /* Grab the MBR again */ 392 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 393 read_block(0, mbr, "Cannot read block 0 on DASD"); 394 395 if (magic_match(mbr->magic, IPL1_MAGIC)) { 396 ipl_eckd_cdl(); /* no return */ 397 } 398 399 /* LDL/CMS? */ 400 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 401 read_block(2, vlbl, "Cannot read block 2"); 402 403 if (magic_match(vlbl->magic, CMS1_MAGIC)) { 404 ipl_eckd_ldl(ECKD_CMS); /* no return */ 405 } 406 if (magic_match(vlbl->magic, LNX1_MAGIC)) { 407 ipl_eckd_ldl(ECKD_LDL); /* no return */ 408 } 409 410 ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ 411 /* 412 * Ok, it is not a LDL by any means. 413 * It still might be a CDL with zero record keys for IPL1 and IPL2 414 */ 415 ipl_eckd_cdl(); 416 } 417 418 /*********************************************************************** 419 * IPL a SCSI disk 420 */ 421 422 static void zipl_load_segment(ComponentEntry *entry) 423 { 424 const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr)); 425 ScsiBlockPtr *bprs = (void *)sec; 426 const int bprs_size = sizeof(sec); 427 block_number_t blockno; 428 uint64_t address; 429 int i; 430 char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ"; 431 char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */ 432 433 blockno = entry->data.blockno; 434 address = entry->load_address; 435 436 debug_print_int("loading segment at block", blockno); 437 debug_print_int("addr", address); 438 439 do { 440 memset(bprs, FREE_SPACE_FILLER, bprs_size); 441 fill_hex_val(blk_no, &blockno, sizeof(blockno)); 442 read_block(blockno, bprs, err_msg); 443 444 for (i = 0;; i++) { 445 uint64_t *cur_desc = (void *)&bprs[i]; 446 447 blockno = bprs[i].blockno; 448 if (!blockno) { 449 break; 450 } 451 452 /* we need the updated blockno for the next indirect entry in the 453 chain, but don't want to advance address */ 454 if (i == (max_entries - 1)) { 455 break; 456 } 457 458 if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1], 459 sizeof(ScsiBlockPtr))) { 460 /* This is a "continue" pointer. 461 * This ptr is the last one in the current script section. 462 * I.e. the next ptr must point to the unused memory area. 463 * The blockno is not zero, so the upper loop must continue 464 * reading next section of BPRS. 465 */ 466 break; 467 } 468 address = virtio_load_direct(cur_desc[0], cur_desc[1], 0, 469 (void *)address); 470 IPL_assert(address != -1, "zIPL load segment failed"); 471 } 472 } while (blockno); 473 } 474 475 /* Run a zipl program */ 476 static void zipl_run(ScsiBlockPtr *pte) 477 { 478 ComponentHeader *header; 479 ComponentEntry *entry; 480 uint8_t tmp_sec[MAX_SECTOR_SIZE]; 481 482 read_block(pte->blockno, tmp_sec, "Cannot read header"); 483 header = (ComponentHeader *)tmp_sec; 484 485 IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); 486 IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); 487 488 dputs("start loading images\n"); 489 490 /* Load image(s) into RAM */ 491 entry = (ComponentEntry *)(&header[1]); 492 while (entry->component_type == ZIPL_COMP_ENTRY_LOAD) { 493 zipl_load_segment(entry); 494 495 entry++; 496 497 IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE), 498 "Wrong entry value"); 499 } 500 501 IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry"); 502 503 /* should not return */ 504 jump_to_IPL_code(entry->load_address); 505 } 506 507 static void ipl_scsi(void) 508 { 509 ScsiMbr *mbr = (void *)sec; 510 int program_table_entries = 0; 511 BootMapTable *prog_table = (void *)sec; 512 unsigned int loadparm = get_loadparm_index(); 513 bool valid_entries[MAX_BOOT_ENTRIES] = {false}; 514 size_t i; 515 516 /* Grab the MBR */ 517 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 518 read_block(0, mbr, "Cannot read block 0"); 519 520 if (!magic_match(mbr->magic, ZIPL_MAGIC)) { 521 return; 522 } 523 524 sclp_print("Using SCSI scheme.\n"); 525 debug_print_int("MBR Version", mbr->version_id); 526 IPL_check(mbr->version_id == 1, 527 "Unknown MBR layout version, assuming version 1"); 528 debug_print_int("program table", mbr->pt.blockno); 529 IPL_assert(mbr->pt.blockno, "No Program Table"); 530 531 /* Parse the program table */ 532 read_block(mbr->pt.blockno, sec, "Error reading Program Table"); 533 IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); 534 535 for (i = 0; i < MAX_BOOT_ENTRIES; i++) { 536 if (prog_table->entry[i].scsi.blockno) { 537 valid_entries[i] = true; 538 program_table_entries++; 539 } 540 } 541 542 debug_print_int("program table entries", program_table_entries); 543 IPL_assert(program_table_entries != 0, "Empty Program Table"); 544 545 if (menu_is_enabled_enum()) { 546 loadparm = menu_get_enum_boot_index(valid_entries); 547 } 548 549 debug_print_int("loadparm", loadparm); 550 IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" 551 " maximum number of boot entries allowed"); 552 553 zipl_run(&prog_table->entry[loadparm].scsi); /* no return */ 554 } 555 556 /*********************************************************************** 557 * IPL El Torito ISO9660 image or DVD 558 */ 559 560 static bool is_iso_bc_entry_compatible(IsoBcSection *s) 561 { 562 uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE); 563 564 if (s->unused || !s->sector_count) { 565 return false; 566 } 567 read_iso_sector(bswap32(s->load_rba), magic_sec, 568 "Failed to read image sector 0"); 569 570 /* Checking bytes 8 - 32 for S390 Linux magic */ 571 return !memcmp(magic_sec + 8, linux_s390_magic, 24); 572 } 573 574 /* Location of the current sector of the directory */ 575 static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH]; 576 /* Offset in the current sector of the directory */ 577 static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH]; 578 /* Remained directory space in bytes */ 579 static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH]; 580 581 static inline uint32_t iso_get_file_size(uint32_t load_rba) 582 { 583 IsoVolDesc *vd = (IsoVolDesc *)sec; 584 IsoDirHdr *cur_record = &vd->vd.primary.rootdir; 585 uint8_t *temp = sec + ISO_SECTOR_SIZE; 586 int level = 0; 587 588 read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec, 589 "Failed to read ISO primary descriptor"); 590 sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); 591 dir_rem[0] = 0; 592 sec_offset[0] = 0; 593 594 while (level >= 0) { 595 IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE, 596 "Directory tree structure violation"); 597 598 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 599 600 if (sec_offset[level] == 0) { 601 read_iso_sector(sec_loc[level], temp, 602 "Failed to read ISO directory"); 603 if (dir_rem[level] == 0) { 604 /* Skip self and parent records */ 605 dir_rem[level] = iso_733_to_u32(cur_record->data_len) - 606 cur_record->dr_len; 607 sec_offset[level] += cur_record->dr_len; 608 609 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 610 dir_rem[level] -= cur_record->dr_len; 611 sec_offset[level] += cur_record->dr_len; 612 continue; 613 } 614 } 615 616 if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) { 617 /* Zero-padding and/or the end of current sector */ 618 dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level]; 619 sec_offset[level] = 0; 620 sec_loc[level]++; 621 } else { 622 /* The directory record is valid */ 623 if (load_rba == iso_733_to_u32(cur_record->ext_loc)) { 624 return iso_733_to_u32(cur_record->data_len); 625 } 626 627 dir_rem[level] -= cur_record->dr_len; 628 sec_offset[level] += cur_record->dr_len; 629 630 if (cur_record->file_flags & 0x2) { 631 /* Subdirectory */ 632 if (level == ISO9660_MAX_DIR_DEPTH - 1) { 633 sclp_print("ISO-9660 directory depth limit exceeded\n"); 634 } else { 635 level++; 636 sec_loc[level] = iso_733_to_u32(cur_record->ext_loc); 637 sec_offset[level] = 0; 638 dir_rem[level] = 0; 639 continue; 640 } 641 } 642 } 643 644 if (dir_rem[level] == 0) { 645 /* Nothing remaining */ 646 level--; 647 read_iso_sector(sec_loc[level], temp, 648 "Failed to read ISO directory"); 649 } 650 } 651 652 return 0; 653 } 654 655 static void load_iso_bc_entry(IsoBcSection *load) 656 { 657 IsoBcSection s = *load; 658 /* 659 * According to spec, extent for each file 660 * is padded and ISO_SECTOR_SIZE bytes aligned 661 */ 662 uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT; 663 uint32_t real_size = iso_get_file_size(bswap32(s.load_rba)); 664 665 if (real_size) { 666 /* Round up blocks to load */ 667 blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; 668 sclp_print("ISO boot image size verified\n"); 669 } else { 670 sclp_print("ISO boot image size could not be verified\n"); 671 } 672 673 read_iso_boot_image(bswap32(s.load_rba), 674 (void *)((uint64_t)bswap16(s.load_segment)), 675 blks_to_load); 676 677 jump_to_low_kernel(); 678 } 679 680 static uint32_t find_iso_bc(void) 681 { 682 IsoVolDesc *vd = (IsoVolDesc *)sec; 683 uint32_t block_num = ISO_PRIMARY_VD_SECTOR; 684 685 if (virtio_read_many(block_num++, sec, 1)) { 686 /* If primary vd cannot be read, there is no boot catalog */ 687 return 0; 688 } 689 690 while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) { 691 if (vd->type == VOL_DESC_TYPE_BOOT) { 692 IsoVdElTorito *et = &vd->vd.boot; 693 694 if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) { 695 return bswap32(et->bc_offset); 696 } 697 } 698 read_iso_sector(block_num++, sec, 699 "Failed to read ISO volume descriptor"); 700 } 701 702 return 0; 703 } 704 705 static IsoBcSection *find_iso_bc_entry(void) 706 { 707 IsoBcEntry *e = (IsoBcEntry *)sec; 708 uint32_t offset = find_iso_bc(); 709 int i; 710 unsigned int loadparm = get_loadparm_index(); 711 712 if (!offset) { 713 return NULL; 714 } 715 716 read_iso_sector(offset, sec, "Failed to read El Torito boot catalog"); 717 718 if (!is_iso_bc_valid(e)) { 719 /* The validation entry is mandatory */ 720 panic("No valid boot catalog found!\n"); 721 return NULL; 722 } 723 724 /* 725 * Each entry has 32 bytes size, so one sector cannot contain > 64 entries. 726 * We consider only boot catalogs with no more than 64 entries. 727 */ 728 for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) { 729 if (e[i].id == ISO_BC_BOOTABLE_SECTION) { 730 if (is_iso_bc_entry_compatible(&e[i].body.sect)) { 731 if (loadparm <= 1) { 732 /* found, default, or unspecified */ 733 return &e[i].body.sect; 734 } 735 loadparm--; 736 } 737 } 738 } 739 740 panic("No suitable boot entry found on ISO-9660 media!\n"); 741 742 return NULL; 743 } 744 745 static void ipl_iso_el_torito(void) 746 { 747 IsoBcSection *s = find_iso_bc_entry(); 748 749 if (s) { 750 load_iso_bc_entry(s); 751 /* no return */ 752 } 753 } 754 755 /*********************************************************************** 756 * Bus specific IPL sequences 757 */ 758 759 static void zipl_load_vblk(void) 760 { 761 if (virtio_guessed_disk_nature()) { 762 virtio_assume_iso9660(); 763 } 764 ipl_iso_el_torito(); 765 766 if (virtio_guessed_disk_nature()) { 767 sclp_print("Using guessed DASD geometry.\n"); 768 virtio_assume_eckd(); 769 } 770 ipl_eckd(); 771 } 772 773 static void zipl_load_vscsi(void) 774 { 775 if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { 776 /* Is it an ISO image in non-CD drive? */ 777 ipl_iso_el_torito(); 778 } 779 780 sclp_print("Using guessed DASD geometry.\n"); 781 virtio_assume_eckd(); 782 ipl_eckd(); 783 } 784 785 /*********************************************************************** 786 * IPL starts here 787 */ 788 789 void zipl_load(void) 790 { 791 VDev *vdev = virtio_get_device(); 792 793 if (vdev->is_cdrom) { 794 ipl_iso_el_torito(); 795 panic("\n! Cannot IPL this ISO image !\n"); 796 } 797 798 if (virtio_get_device_type() == VIRTIO_ID_NET) { 799 jump_to_IPL_code(vdev->netboot_start_addr); 800 } 801 802 ipl_scsi(); 803 804 switch (virtio_get_device_type()) { 805 case VIRTIO_ID_BLOCK: 806 zipl_load_vblk(); 807 break; 808 case VIRTIO_ID_SCSI: 809 zipl_load_vscsi(); 810 break; 811 default: 812 panic("\n! Unknown IPL device type !\n"); 813 } 814 815 panic("\n* this can never happen *\n"); 816 } 817