bootmap.c (26231B)
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 "s390-arch.h" 14 #include "bootmap.h" 15 #include "virtio.h" 16 #include "bswap.h" 17 18 #ifdef DEBUG 19 /* #define DEBUG_FALLBACK */ 20 #endif 21 22 #ifdef DEBUG_FALLBACK 23 #define dputs(txt) \ 24 do { sclp_print("zipl: " txt); } while (0) 25 #else 26 #define dputs(fmt, ...) \ 27 do { } while (0) 28 #endif 29 30 /* Scratch space */ 31 static uint8_t sec[MAX_SECTOR_SIZE*4] __attribute__((__aligned__(PAGE_SIZE))); 32 33 const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION" 34 "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; 35 36 /* 37 * Match two CCWs located after PSW and eight filler bytes. 38 * From libmagic and arch/s390/kernel/head.S. 39 */ 40 const uint8_t linux_s390_magic[] = "\x02\x00\x00\x18\x60\x00\x00\x50\x02\x00" 41 "\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40" 42 "\x40\x40\x40\x40"; 43 44 static inline bool is_iso_vd_valid(IsoVolDesc *vd) 45 { 46 const uint8_t vol_desc_magic[] = "CD001"; 47 48 return !memcmp(&vd->ident[0], vol_desc_magic, 5) && 49 vd->version == 0x1 && 50 vd->type <= VOL_DESC_TYPE_PARTITION; 51 } 52 53 /*********************************************************************** 54 * IPL an ECKD DASD (CDL or LDL/CMS format) 55 */ 56 57 static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */ 58 static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr); 59 static uint8_t _s2[MAX_SECTOR_SIZE * 3] __attribute__((__aligned__(PAGE_SIZE))); 60 static void *s2_prev_blk = _s2; 61 static void *s2_cur_blk = _s2 + MAX_SECTOR_SIZE; 62 static void *s2_next_blk = _s2 + MAX_SECTOR_SIZE * 2; 63 64 static inline void verify_boot_info(BootInfo *bip) 65 { 66 IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo"); 67 IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version"); 68 IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL"); 69 IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD"); 70 IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch"); 71 IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size), 72 "Bad block size in zIPL section of the 1st record."); 73 } 74 75 static block_number_t eckd_block_num(EckdCHS *chs) 76 { 77 const uint64_t sectors = virtio_get_sectors(); 78 const uint64_t heads = virtio_get_heads(); 79 const uint64_t cylinder = chs->cylinder 80 + ((chs->head & 0xfff0) << 12); 81 const uint64_t head = chs->head & 0x000f; 82 const block_number_t block = sectors * heads * cylinder 83 + sectors * head 84 + chs->sector 85 - 1; /* block nr starts with zero */ 86 return block; 87 } 88 89 static bool eckd_valid_address(BootMapPointer *p) 90 { 91 const uint64_t head = p->eckd.chs.head & 0x000f; 92 93 if (head >= virtio_get_heads() 94 || p->eckd.chs.sector > virtio_get_sectors() 95 || p->eckd.chs.sector <= 0) { 96 return false; 97 } 98 99 if (!virtio_guessed_disk_nature() && 100 eckd_block_num(&p->eckd.chs) >= virtio_get_blocks()) { 101 return false; 102 } 103 104 return true; 105 } 106 107 static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address) 108 { 109 block_number_t block_nr; 110 int j, rc; 111 BootMapPointer *bprs = (void *)_bprs; 112 bool more_data; 113 114 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 115 read_block(blk, bprs, "BPRS read failed"); 116 117 do { 118 more_data = false; 119 for (j = 0;; j++) { 120 block_nr = eckd_block_num(&bprs[j].xeckd.bptr.chs); 121 if (is_null_block_number(block_nr)) { /* end of chunk */ 122 break; 123 } 124 125 /* we need the updated blockno for the next indirect entry 126 * in the chain, but don't want to advance address 127 */ 128 if (j == (max_bprs_entries - 1)) { 129 break; 130 } 131 132 IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size), 133 "bad chunk block size"); 134 IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr"); 135 136 if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]), 137 sizeof(EckdBlockPtr))) { 138 /* This is a "continue" pointer. 139 * This ptr should be the last one in the current 140 * script section. 141 * I.e. the next ptr must point to the unused memory area 142 */ 143 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 144 read_block(block_nr, bprs, "BPRS continuation read failed"); 145 more_data = true; 146 break; 147 } 148 149 /* Load (count+1) blocks of code at (block_nr) 150 * to memory (address). 151 */ 152 rc = virtio_read_many(block_nr, (void *)(*address), 153 bprs[j].xeckd.bptr.count+1); 154 IPL_assert(rc == 0, "code chunk read failed"); 155 156 *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size(); 157 } 158 } while (more_data); 159 return block_nr; 160 } 161 162 static bool find_zipl_boot_menu_banner(int *offset) 163 { 164 int i; 165 166 /* Menu banner starts with "zIPL" */ 167 for (i = 0; i <= virtio_get_block_size() - 4; i++) { 168 if (magic_match(s2_cur_blk + i, ZIPL_MAGIC_EBCDIC)) { 169 *offset = i; 170 return true; 171 } 172 } 173 174 return false; 175 } 176 177 static int eckd_get_boot_menu_index(block_number_t s1b_block_nr) 178 { 179 block_number_t cur_block_nr; 180 block_number_t prev_block_nr = 0; 181 block_number_t next_block_nr = 0; 182 EckdStage1b *s1b = (void *)sec; 183 int banner_offset; 184 int i; 185 186 /* Get Stage1b data */ 187 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 188 read_block(s1b_block_nr, s1b, "Cannot read stage1b boot loader"); 189 190 memset(_s2, FREE_SPACE_FILLER, sizeof(_s2)); 191 192 /* Get Stage2 data */ 193 for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) { 194 cur_block_nr = eckd_block_num(&s1b->seek[i].chs); 195 196 if (!cur_block_nr || is_null_block_number(cur_block_nr)) { 197 break; 198 } 199 200 read_block(cur_block_nr, s2_cur_blk, "Cannot read stage2 boot loader"); 201 202 if (find_zipl_boot_menu_banner(&banner_offset)) { 203 /* 204 * Load the adjacent blocks to account for the 205 * possibility of menu data spanning multiple blocks. 206 */ 207 if (prev_block_nr) { 208 read_block(prev_block_nr, s2_prev_blk, 209 "Cannot read stage2 boot loader"); 210 } 211 212 if (i + 1 < STAGE2_BLK_CNT_MAX) { 213 next_block_nr = eckd_block_num(&s1b->seek[i + 1].chs); 214 } 215 216 if (next_block_nr && !is_null_block_number(next_block_nr)) { 217 read_block(next_block_nr, s2_next_blk, 218 "Cannot read stage2 boot loader"); 219 } 220 221 return menu_get_zipl_boot_index(s2_cur_blk + banner_offset); 222 } 223 224 prev_block_nr = cur_block_nr; 225 } 226 227 sclp_print("No zipl boot menu data found. Booting default entry."); 228 return 0; 229 } 230 231 static void run_eckd_boot_script(block_number_t bmt_block_nr, 232 block_number_t s1b_block_nr) 233 { 234 int i; 235 unsigned int loadparm = get_loadparm_index(); 236 block_number_t block_nr; 237 uint64_t address; 238 BootMapTable *bmt = (void *)sec; 239 BootMapScript *bms = (void *)sec; 240 241 if (menu_is_enabled_zipl()) { 242 loadparm = eckd_get_boot_menu_index(s1b_block_nr); 243 } 244 245 debug_print_int("loadparm", loadparm); 246 IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" 247 " maximum number of boot entries allowed"); 248 249 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 250 read_block(bmt_block_nr, sec, "Cannot read Boot Map Table"); 251 252 block_nr = eckd_block_num(&bmt->entry[loadparm].xeckd.bptr.chs); 253 IPL_assert(block_nr != -1, "Cannot find Boot Map Table Entry"); 254 255 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 256 read_block(block_nr, sec, "Cannot read Boot Map Script"); 257 258 for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD || 259 bms->entry[i].type == BOOT_SCRIPT_SIGNATURE; i++) { 260 261 /* We don't support secure boot yet, so we skip signature entries */ 262 if (bms->entry[i].type == BOOT_SCRIPT_SIGNATURE) { 263 continue; 264 } 265 266 address = bms->entry[i].address.load_address; 267 block_nr = eckd_block_num(&bms->entry[i].blkptr.xeckd.bptr.chs); 268 269 do { 270 block_nr = load_eckd_segments(block_nr, &address); 271 } while (block_nr != -1); 272 } 273 274 IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC, 275 "Unknown script entry type"); 276 write_reset_psw(bms->entry[i].address.load_address); /* no return */ 277 jump_to_IPL_code(0); /* no return */ 278 } 279 280 static void ipl_eckd_cdl(void) 281 { 282 XEckdMbr *mbr; 283 EckdCdlIpl2 *ipl2 = (void *)sec; 284 IplVolumeLabel *vlbl = (void *)sec; 285 block_number_t bmt_block_nr, s1b_block_nr; 286 287 /* we have just read the block #0 and recognized it as "IPL1" */ 288 sclp_print("CDL\n"); 289 290 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 291 read_block(1, ipl2, "Cannot read IPL2 record at block 1"); 292 293 mbr = &ipl2->mbr; 294 if (!magic_match(mbr, ZIPL_MAGIC)) { 295 sclp_print("No zIPL section in IPL2 record.\n"); 296 return; 297 } 298 if (!block_size_ok(mbr->blockptr.xeckd.bptr.size)) { 299 sclp_print("Bad block size in zIPL section of IPL2 record.\n"); 300 return; 301 } 302 if (mbr->dev_type != DEV_TYPE_ECKD) { 303 sclp_print("Non-ECKD device type in zIPL section of IPL2 record.\n"); 304 return; 305 } 306 307 /* save pointer to Boot Map Table */ 308 bmt_block_nr = eckd_block_num(&mbr->blockptr.xeckd.bptr.chs); 309 310 /* save pointer to Stage1b Data */ 311 s1b_block_nr = eckd_block_num(&ipl2->stage1.seek[0].chs); 312 313 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 314 read_block(2, vlbl, "Cannot read Volume Label at block 2"); 315 if (!magic_match(vlbl->key, VOL1_MAGIC)) { 316 sclp_print("Invalid magic of volume label block.\n"); 317 return; 318 } 319 if (!magic_match(vlbl->f.key, VOL1_MAGIC)) { 320 sclp_print("Invalid magic of volser block.\n"); 321 return; 322 } 323 print_volser(vlbl->f.volser); 324 325 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 326 /* no return */ 327 } 328 329 static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode) 330 { 331 LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */ 332 char msg[4] = { '?', '.', '\n', '\0' }; 333 334 sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL"); 335 sclp_print(" version "); 336 switch (vlbl->LDL_version) { 337 case LDL1_VERSION: 338 msg[0] = '1'; 339 break; 340 case LDL2_VERSION: 341 msg[0] = '2'; 342 break; 343 default: 344 msg[0] = ebc2asc[vlbl->LDL_version]; 345 msg[1] = '?'; 346 break; 347 } 348 sclp_print(msg); 349 print_volser(vlbl->volser); 350 } 351 352 static void ipl_eckd_ldl(ECKD_IPL_mode_t mode) 353 { 354 block_number_t bmt_block_nr, s1b_block_nr; 355 EckdLdlIpl1 *ipl1 = (void *)sec; 356 357 if (mode != ECKD_LDL_UNLABELED) { 358 print_eckd_ldl_msg(mode); 359 } 360 361 /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */ 362 363 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 364 read_block(0, sec, "Cannot read block 0 to grab boot info."); 365 if (mode == ECKD_LDL_UNLABELED) { 366 if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) { 367 return; /* not applicable layout */ 368 } 369 sclp_print("unlabeled LDL.\n"); 370 } 371 verify_boot_info(&ipl1->bip); 372 373 /* save pointer to Boot Map Table */ 374 bmt_block_nr = eckd_block_num(&ipl1->bip.bp.ipl.bm_ptr.eckd.bptr.chs); 375 376 /* save pointer to Stage1b Data */ 377 s1b_block_nr = eckd_block_num(&ipl1->stage1.seek[0].chs); 378 379 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 380 /* no return */ 381 } 382 383 static void print_eckd_msg(void) 384 { 385 char msg[] = "Using ECKD scheme (block size *****), "; 386 char *p = &msg[34], *q = &msg[30]; 387 int n = virtio_get_block_size(); 388 389 /* Fill in the block size and show up the message */ 390 if (n > 0 && n <= 99999) { 391 while (n) { 392 *p-- = '0' + (n % 10); 393 n /= 10; 394 } 395 while (p >= q) { 396 *p-- = ' '; 397 } 398 } 399 sclp_print(msg); 400 } 401 402 static void ipl_eckd(void) 403 { 404 XEckdMbr *mbr = (void *)sec; 405 LDL_VTOC *vlbl = (void *)sec; 406 407 print_eckd_msg(); 408 409 /* Grab the MBR again */ 410 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 411 read_block(0, mbr, "Cannot read block 0 on DASD"); 412 413 if (magic_match(mbr->magic, IPL1_MAGIC)) { 414 ipl_eckd_cdl(); /* only returns in case of error */ 415 return; 416 } 417 418 /* LDL/CMS? */ 419 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 420 read_block(2, vlbl, "Cannot read block 2"); 421 422 if (magic_match(vlbl->magic, CMS1_MAGIC)) { 423 ipl_eckd_ldl(ECKD_CMS); /* no return */ 424 } 425 if (magic_match(vlbl->magic, LNX1_MAGIC)) { 426 ipl_eckd_ldl(ECKD_LDL); /* no return */ 427 } 428 429 ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ 430 /* 431 * Ok, it is not a LDL by any means. 432 * It still might be a CDL with zero record keys for IPL1 and IPL2 433 */ 434 ipl_eckd_cdl(); 435 } 436 437 /*********************************************************************** 438 * IPL a SCSI disk 439 */ 440 441 static void zipl_load_segment(ComponentEntry *entry) 442 { 443 const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr)); 444 ScsiBlockPtr *bprs = (void *)sec; 445 const int bprs_size = sizeof(sec); 446 block_number_t blockno; 447 uint64_t address; 448 int i; 449 char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ"; 450 char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */ 451 452 blockno = entry->data.blockno; 453 address = entry->compdat.load_addr; 454 455 debug_print_int("loading segment at block", blockno); 456 debug_print_int("addr", address); 457 458 do { 459 memset(bprs, FREE_SPACE_FILLER, bprs_size); 460 fill_hex_val(blk_no, &blockno, sizeof(blockno)); 461 read_block(blockno, bprs, err_msg); 462 463 for (i = 0;; i++) { 464 uint64_t *cur_desc = (void *)&bprs[i]; 465 466 blockno = bprs[i].blockno; 467 if (!blockno) { 468 break; 469 } 470 471 /* we need the updated blockno for the next indirect entry in the 472 chain, but don't want to advance address */ 473 if (i == (max_entries - 1)) { 474 break; 475 } 476 477 if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1], 478 sizeof(ScsiBlockPtr))) { 479 /* This is a "continue" pointer. 480 * This ptr is the last one in the current script section. 481 * I.e. the next ptr must point to the unused memory area. 482 * The blockno is not zero, so the upper loop must continue 483 * reading next section of BPRS. 484 */ 485 break; 486 } 487 address = virtio_load_direct(cur_desc[0], cur_desc[1], 0, 488 (void *)address); 489 IPL_assert(address != -1, "zIPL load segment failed"); 490 } 491 } while (blockno); 492 } 493 494 /* Run a zipl program */ 495 static void zipl_run(ScsiBlockPtr *pte) 496 { 497 ComponentHeader *header; 498 ComponentEntry *entry; 499 uint8_t tmp_sec[MAX_SECTOR_SIZE]; 500 501 read_block(pte->blockno, tmp_sec, "Cannot read header"); 502 header = (ComponentHeader *)tmp_sec; 503 504 IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); 505 IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); 506 507 dputs("start loading images\n"); 508 509 /* Load image(s) into RAM */ 510 entry = (ComponentEntry *)(&header[1]); 511 while (entry->component_type == ZIPL_COMP_ENTRY_LOAD || 512 entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) { 513 514 /* We don't support secure boot yet, so we skip signature entries */ 515 if (entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) { 516 entry++; 517 continue; 518 } 519 520 zipl_load_segment(entry); 521 522 entry++; 523 524 IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE), 525 "Wrong entry value"); 526 } 527 528 IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry"); 529 530 /* should not return */ 531 write_reset_psw(entry->compdat.load_psw); 532 jump_to_IPL_code(0); 533 } 534 535 static void ipl_scsi(void) 536 { 537 ScsiMbr *mbr = (void *)sec; 538 int program_table_entries = 0; 539 BootMapTable *prog_table = (void *)sec; 540 unsigned int loadparm = get_loadparm_index(); 541 bool valid_entries[MAX_BOOT_ENTRIES] = {false}; 542 size_t i; 543 544 /* Grab the MBR */ 545 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 546 read_block(0, mbr, "Cannot read block 0"); 547 548 if (!magic_match(mbr->magic, ZIPL_MAGIC)) { 549 return; 550 } 551 552 sclp_print("Using SCSI scheme.\n"); 553 debug_print_int("MBR Version", mbr->version_id); 554 IPL_check(mbr->version_id == 1, 555 "Unknown MBR layout version, assuming version 1"); 556 debug_print_int("program table", mbr->pt.blockno); 557 IPL_assert(mbr->pt.blockno, "No Program Table"); 558 559 /* Parse the program table */ 560 read_block(mbr->pt.blockno, sec, "Error reading Program Table"); 561 IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); 562 563 for (i = 0; i < MAX_BOOT_ENTRIES; i++) { 564 if (prog_table->entry[i].scsi.blockno) { 565 valid_entries[i] = true; 566 program_table_entries++; 567 } 568 } 569 570 debug_print_int("program table entries", program_table_entries); 571 IPL_assert(program_table_entries != 0, "Empty Program Table"); 572 573 if (menu_is_enabled_enum()) { 574 loadparm = menu_get_enum_boot_index(valid_entries); 575 } 576 577 debug_print_int("loadparm", loadparm); 578 IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" 579 " maximum number of boot entries allowed"); 580 581 zipl_run(&prog_table->entry[loadparm].scsi); /* no return */ 582 } 583 584 /*********************************************************************** 585 * IPL El Torito ISO9660 image or DVD 586 */ 587 588 static bool is_iso_bc_entry_compatible(IsoBcSection *s) 589 { 590 uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE); 591 592 if (s->unused || !s->sector_count) { 593 return false; 594 } 595 read_iso_sector(bswap32(s->load_rba), magic_sec, 596 "Failed to read image sector 0"); 597 598 /* Checking bytes 8 - 32 for S390 Linux magic */ 599 return !memcmp(magic_sec + 8, linux_s390_magic, 24); 600 } 601 602 /* Location of the current sector of the directory */ 603 static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH]; 604 /* Offset in the current sector of the directory */ 605 static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH]; 606 /* Remained directory space in bytes */ 607 static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH]; 608 609 static inline uint32_t iso_get_file_size(uint32_t load_rba) 610 { 611 IsoVolDesc *vd = (IsoVolDesc *)sec; 612 IsoDirHdr *cur_record = &vd->vd.primary.rootdir; 613 uint8_t *temp = sec + ISO_SECTOR_SIZE; 614 int level = 0; 615 616 read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec, 617 "Failed to read ISO primary descriptor"); 618 sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); 619 dir_rem[0] = 0; 620 sec_offset[0] = 0; 621 622 while (level >= 0) { 623 IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE, 624 "Directory tree structure violation"); 625 626 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 627 628 if (sec_offset[level] == 0) { 629 read_iso_sector(sec_loc[level], temp, 630 "Failed to read ISO directory"); 631 if (dir_rem[level] == 0) { 632 /* Skip self and parent records */ 633 dir_rem[level] = iso_733_to_u32(cur_record->data_len) - 634 cur_record->dr_len; 635 sec_offset[level] += cur_record->dr_len; 636 637 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 638 dir_rem[level] -= cur_record->dr_len; 639 sec_offset[level] += cur_record->dr_len; 640 continue; 641 } 642 } 643 644 if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) { 645 /* Zero-padding and/or the end of current sector */ 646 dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level]; 647 sec_offset[level] = 0; 648 sec_loc[level]++; 649 } else { 650 /* The directory record is valid */ 651 if (load_rba == iso_733_to_u32(cur_record->ext_loc)) { 652 return iso_733_to_u32(cur_record->data_len); 653 } 654 655 dir_rem[level] -= cur_record->dr_len; 656 sec_offset[level] += cur_record->dr_len; 657 658 if (cur_record->file_flags & 0x2) { 659 /* Subdirectory */ 660 if (level == ISO9660_MAX_DIR_DEPTH - 1) { 661 sclp_print("ISO-9660 directory depth limit exceeded\n"); 662 } else { 663 level++; 664 sec_loc[level] = iso_733_to_u32(cur_record->ext_loc); 665 sec_offset[level] = 0; 666 dir_rem[level] = 0; 667 continue; 668 } 669 } 670 } 671 672 if (dir_rem[level] == 0) { 673 /* Nothing remaining */ 674 level--; 675 read_iso_sector(sec_loc[level], temp, 676 "Failed to read ISO directory"); 677 } 678 } 679 680 return 0; 681 } 682 683 static void load_iso_bc_entry(IsoBcSection *load) 684 { 685 IsoBcSection s = *load; 686 /* 687 * According to spec, extent for each file 688 * is padded and ISO_SECTOR_SIZE bytes aligned 689 */ 690 uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT; 691 uint32_t real_size = iso_get_file_size(bswap32(s.load_rba)); 692 693 if (real_size) { 694 /* Round up blocks to load */ 695 blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; 696 sclp_print("ISO boot image size verified\n"); 697 } else { 698 sclp_print("ISO boot image size could not be verified\n"); 699 } 700 701 read_iso_boot_image(bswap32(s.load_rba), 702 (void *)((uint64_t)bswap16(s.load_segment)), 703 blks_to_load); 704 705 jump_to_low_kernel(); 706 } 707 708 static uint32_t find_iso_bc(void) 709 { 710 IsoVolDesc *vd = (IsoVolDesc *)sec; 711 uint32_t block_num = ISO_PRIMARY_VD_SECTOR; 712 713 if (virtio_read_many(block_num++, sec, 1)) { 714 /* If primary vd cannot be read, there is no boot catalog */ 715 return 0; 716 } 717 718 while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) { 719 if (vd->type == VOL_DESC_TYPE_BOOT) { 720 IsoVdElTorito *et = &vd->vd.boot; 721 722 if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) { 723 return bswap32(et->bc_offset); 724 } 725 } 726 read_iso_sector(block_num++, sec, 727 "Failed to read ISO volume descriptor"); 728 } 729 730 return 0; 731 } 732 733 static IsoBcSection *find_iso_bc_entry(void) 734 { 735 IsoBcEntry *e = (IsoBcEntry *)sec; 736 uint32_t offset = find_iso_bc(); 737 int i; 738 unsigned int loadparm = get_loadparm_index(); 739 740 if (!offset) { 741 return NULL; 742 } 743 744 read_iso_sector(offset, sec, "Failed to read El Torito boot catalog"); 745 746 if (!is_iso_bc_valid(e)) { 747 /* The validation entry is mandatory */ 748 panic("No valid boot catalog found!\n"); 749 return NULL; 750 } 751 752 /* 753 * Each entry has 32 bytes size, so one sector cannot contain > 64 entries. 754 * We consider only boot catalogs with no more than 64 entries. 755 */ 756 for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) { 757 if (e[i].id == ISO_BC_BOOTABLE_SECTION) { 758 if (is_iso_bc_entry_compatible(&e[i].body.sect)) { 759 if (loadparm <= 1) { 760 /* found, default, or unspecified */ 761 return &e[i].body.sect; 762 } 763 loadparm--; 764 } 765 } 766 } 767 768 panic("No suitable boot entry found on ISO-9660 media!\n"); 769 770 return NULL; 771 } 772 773 static void ipl_iso_el_torito(void) 774 { 775 IsoBcSection *s = find_iso_bc_entry(); 776 777 if (s) { 778 load_iso_bc_entry(s); 779 /* no return */ 780 } 781 } 782 783 /** 784 * Detect whether we're trying to boot from an .ISO image. 785 * These always have a signature string "CD001" at offset 0x8001. 786 */ 787 static bool has_iso_signature(void) 788 { 789 int blksize = virtio_get_block_size(); 790 791 if (!blksize || virtio_read(0x8000 / blksize, sec)) { 792 return false; 793 } 794 795 return !memcmp("CD001", &sec[1], 5); 796 } 797 798 /*********************************************************************** 799 * Bus specific IPL sequences 800 */ 801 802 static void zipl_load_vblk(void) 803 { 804 int blksize = virtio_get_block_size(); 805 806 if (blksize == VIRTIO_ISO_BLOCK_SIZE || has_iso_signature()) { 807 if (blksize != VIRTIO_ISO_BLOCK_SIZE) { 808 virtio_assume_iso9660(); 809 } 810 ipl_iso_el_torito(); 811 } 812 813 if (blksize != VIRTIO_DASD_DEFAULT_BLOCK_SIZE) { 814 sclp_print("Using guessed DASD geometry.\n"); 815 virtio_assume_eckd(); 816 } 817 ipl_eckd(); 818 } 819 820 static void zipl_load_vscsi(void) 821 { 822 if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { 823 /* Is it an ISO image in non-CD drive? */ 824 ipl_iso_el_torito(); 825 } 826 827 sclp_print("Using guessed DASD geometry.\n"); 828 virtio_assume_eckd(); 829 ipl_eckd(); 830 } 831 832 /*********************************************************************** 833 * IPL starts here 834 */ 835 836 void zipl_load(void) 837 { 838 VDev *vdev = virtio_get_device(); 839 840 if (vdev->is_cdrom) { 841 ipl_iso_el_torito(); 842 panic("\n! Cannot IPL this ISO image !\n"); 843 } 844 845 if (virtio_get_device_type() == VIRTIO_ID_NET) { 846 jump_to_IPL_code(vdev->netboot_start_addr); 847 } 848 849 ipl_scsi(); 850 851 switch (virtio_get_device_type()) { 852 case VIRTIO_ID_BLOCK: 853 zipl_load_vblk(); 854 break; 855 case VIRTIO_ID_SCSI: 856 zipl_load_vscsi(); 857 break; 858 default: 859 panic("\n! Unknown IPL device type !\n"); 860 } 861 862 sclp_print("zIPL load failed.\n"); 863 }