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 || 258 bms->entry[i].type == BOOT_SCRIPT_SIGNATURE; i++) { 259 260 /* We don't support secure boot yet, so we skip signature entries */ 261 if (bms->entry[i].type == BOOT_SCRIPT_SIGNATURE) { 262 continue; 263 } 264 265 address = bms->entry[i].address.load_address; 266 block_nr = eckd_block_num(&bms->entry[i].blkptr.xeckd.bptr.chs); 267 268 do { 269 block_nr = load_eckd_segments(block_nr, &address); 270 } while (block_nr != -1); 271 } 272 273 IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC, 274 "Unknown script entry type"); 275 jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */ 276 } 277 278 static void ipl_eckd_cdl(void) 279 { 280 XEckdMbr *mbr; 281 EckdCdlIpl2 *ipl2 = (void *)sec; 282 IplVolumeLabel *vlbl = (void *)sec; 283 block_number_t bmt_block_nr, s1b_block_nr; 284 285 /* we have just read the block #0 and recognized it as "IPL1" */ 286 sclp_print("CDL\n"); 287 288 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 289 read_block(1, ipl2, "Cannot read IPL2 record at block 1"); 290 291 mbr = &ipl2->mbr; 292 IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record."); 293 IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size), 294 "Bad block size in zIPL section of IPL2 record."); 295 IPL_assert(mbr->dev_type == DEV_TYPE_ECKD, 296 "Non-ECKD device type in zIPL section of IPL2 record."); 297 298 /* save pointer to Boot Map Table */ 299 bmt_block_nr = eckd_block_num(&mbr->blockptr.xeckd.bptr.chs); 300 301 /* save pointer to Stage1b Data */ 302 s1b_block_nr = eckd_block_num(&ipl2->stage1.seek[0].chs); 303 304 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 305 read_block(2, vlbl, "Cannot read Volume Label at block 2"); 306 IPL_assert(magic_match(vlbl->key, VOL1_MAGIC), 307 "Invalid magic of volume label block"); 308 IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC), 309 "Invalid magic of volser block"); 310 print_volser(vlbl->f.volser); 311 312 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 313 /* no return */ 314 } 315 316 static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode) 317 { 318 LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */ 319 char msg[4] = { '?', '.', '\n', '\0' }; 320 321 sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL"); 322 sclp_print(" version "); 323 switch (vlbl->LDL_version) { 324 case LDL1_VERSION: 325 msg[0] = '1'; 326 break; 327 case LDL2_VERSION: 328 msg[0] = '2'; 329 break; 330 default: 331 msg[0] = vlbl->LDL_version; 332 msg[0] &= 0x0f; /* convert EBCDIC */ 333 msg[0] |= 0x30; /* to ASCII (digit) */ 334 msg[1] = '?'; 335 break; 336 } 337 sclp_print(msg); 338 print_volser(vlbl->volser); 339 } 340 341 static void ipl_eckd_ldl(ECKD_IPL_mode_t mode) 342 { 343 block_number_t bmt_block_nr, s1b_block_nr; 344 EckdLdlIpl1 *ipl1 = (void *)sec; 345 346 if (mode != ECKD_LDL_UNLABELED) { 347 print_eckd_ldl_msg(mode); 348 } 349 350 /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */ 351 352 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 353 read_block(0, sec, "Cannot read block 0 to grab boot info."); 354 if (mode == ECKD_LDL_UNLABELED) { 355 if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) { 356 return; /* not applicable layout */ 357 } 358 sclp_print("unlabeled LDL.\n"); 359 } 360 verify_boot_info(&ipl1->bip); 361 362 /* save pointer to Boot Map Table */ 363 bmt_block_nr = eckd_block_num(&ipl1->bip.bp.ipl.bm_ptr.eckd.bptr.chs); 364 365 /* save pointer to Stage1b Data */ 366 s1b_block_nr = eckd_block_num(&ipl1->stage1.seek[0].chs); 367 368 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 369 /* no return */ 370 } 371 372 static void print_eckd_msg(void) 373 { 374 char msg[] = "Using ECKD scheme (block size *****), "; 375 char *p = &msg[34], *q = &msg[30]; 376 int n = virtio_get_block_size(); 377 378 /* Fill in the block size and show up the message */ 379 if (n > 0 && n <= 99999) { 380 while (n) { 381 *p-- = '0' + (n % 10); 382 n /= 10; 383 } 384 while (p >= q) { 385 *p-- = ' '; 386 } 387 } 388 sclp_print(msg); 389 } 390 391 static void ipl_eckd(void) 392 { 393 XEckdMbr *mbr = (void *)sec; 394 LDL_VTOC *vlbl = (void *)sec; 395 396 print_eckd_msg(); 397 398 /* Grab the MBR again */ 399 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 400 read_block(0, mbr, "Cannot read block 0 on DASD"); 401 402 if (magic_match(mbr->magic, IPL1_MAGIC)) { 403 ipl_eckd_cdl(); /* no return */ 404 } 405 406 /* LDL/CMS? */ 407 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 408 read_block(2, vlbl, "Cannot read block 2"); 409 410 if (magic_match(vlbl->magic, CMS1_MAGIC)) { 411 ipl_eckd_ldl(ECKD_CMS); /* no return */ 412 } 413 if (magic_match(vlbl->magic, LNX1_MAGIC)) { 414 ipl_eckd_ldl(ECKD_LDL); /* no return */ 415 } 416 417 ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ 418 /* 419 * Ok, it is not a LDL by any means. 420 * It still might be a CDL with zero record keys for IPL1 and IPL2 421 */ 422 ipl_eckd_cdl(); 423 } 424 425 /*********************************************************************** 426 * IPL a SCSI disk 427 */ 428 429 static void zipl_load_segment(ComponentEntry *entry) 430 { 431 const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr)); 432 ScsiBlockPtr *bprs = (void *)sec; 433 const int bprs_size = sizeof(sec); 434 block_number_t blockno; 435 uint64_t address; 436 int i; 437 char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ"; 438 char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */ 439 440 blockno = entry->data.blockno; 441 address = entry->load_address; 442 443 debug_print_int("loading segment at block", blockno); 444 debug_print_int("addr", address); 445 446 do { 447 memset(bprs, FREE_SPACE_FILLER, bprs_size); 448 fill_hex_val(blk_no, &blockno, sizeof(blockno)); 449 read_block(blockno, bprs, err_msg); 450 451 for (i = 0;; i++) { 452 uint64_t *cur_desc = (void *)&bprs[i]; 453 454 blockno = bprs[i].blockno; 455 if (!blockno) { 456 break; 457 } 458 459 /* we need the updated blockno for the next indirect entry in the 460 chain, but don't want to advance address */ 461 if (i == (max_entries - 1)) { 462 break; 463 } 464 465 if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1], 466 sizeof(ScsiBlockPtr))) { 467 /* This is a "continue" pointer. 468 * This ptr is the last one in the current script section. 469 * I.e. the next ptr must point to the unused memory area. 470 * The blockno is not zero, so the upper loop must continue 471 * reading next section of BPRS. 472 */ 473 break; 474 } 475 address = virtio_load_direct(cur_desc[0], cur_desc[1], 0, 476 (void *)address); 477 IPL_assert(address != -1, "zIPL load segment failed"); 478 } 479 } while (blockno); 480 } 481 482 /* Run a zipl program */ 483 static void zipl_run(ScsiBlockPtr *pte) 484 { 485 ComponentHeader *header; 486 ComponentEntry *entry; 487 uint8_t tmp_sec[MAX_SECTOR_SIZE]; 488 489 read_block(pte->blockno, tmp_sec, "Cannot read header"); 490 header = (ComponentHeader *)tmp_sec; 491 492 IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); 493 IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); 494 495 dputs("start loading images\n"); 496 497 /* Load image(s) into RAM */ 498 entry = (ComponentEntry *)(&header[1]); 499 while (entry->component_type == ZIPL_COMP_ENTRY_LOAD || 500 entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) { 501 502 /* We don't support secure boot yet, so we skip signature entries */ 503 if (entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) { 504 entry++; 505 continue; 506 } 507 508 zipl_load_segment(entry); 509 510 entry++; 511 512 IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE), 513 "Wrong entry value"); 514 } 515 516 IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry"); 517 518 /* should not return */ 519 jump_to_IPL_code(entry->load_address); 520 } 521 522 static void ipl_scsi(void) 523 { 524 ScsiMbr *mbr = (void *)sec; 525 int program_table_entries = 0; 526 BootMapTable *prog_table = (void *)sec; 527 unsigned int loadparm = get_loadparm_index(); 528 bool valid_entries[MAX_BOOT_ENTRIES] = {false}; 529 size_t i; 530 531 /* Grab the MBR */ 532 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 533 read_block(0, mbr, "Cannot read block 0"); 534 535 if (!magic_match(mbr->magic, ZIPL_MAGIC)) { 536 return; 537 } 538 539 sclp_print("Using SCSI scheme.\n"); 540 debug_print_int("MBR Version", mbr->version_id); 541 IPL_check(mbr->version_id == 1, 542 "Unknown MBR layout version, assuming version 1"); 543 debug_print_int("program table", mbr->pt.blockno); 544 IPL_assert(mbr->pt.blockno, "No Program Table"); 545 546 /* Parse the program table */ 547 read_block(mbr->pt.blockno, sec, "Error reading Program Table"); 548 IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); 549 550 for (i = 0; i < MAX_BOOT_ENTRIES; i++) { 551 if (prog_table->entry[i].scsi.blockno) { 552 valid_entries[i] = true; 553 program_table_entries++; 554 } 555 } 556 557 debug_print_int("program table entries", program_table_entries); 558 IPL_assert(program_table_entries != 0, "Empty Program Table"); 559 560 if (menu_is_enabled_enum()) { 561 loadparm = menu_get_enum_boot_index(valid_entries); 562 } 563 564 debug_print_int("loadparm", loadparm); 565 IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" 566 " maximum number of boot entries allowed"); 567 568 zipl_run(&prog_table->entry[loadparm].scsi); /* no return */ 569 } 570 571 /*********************************************************************** 572 * IPL El Torito ISO9660 image or DVD 573 */ 574 575 static bool is_iso_bc_entry_compatible(IsoBcSection *s) 576 { 577 uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE); 578 579 if (s->unused || !s->sector_count) { 580 return false; 581 } 582 read_iso_sector(bswap32(s->load_rba), magic_sec, 583 "Failed to read image sector 0"); 584 585 /* Checking bytes 8 - 32 for S390 Linux magic */ 586 return !memcmp(magic_sec + 8, linux_s390_magic, 24); 587 } 588 589 /* Location of the current sector of the directory */ 590 static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH]; 591 /* Offset in the current sector of the directory */ 592 static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH]; 593 /* Remained directory space in bytes */ 594 static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH]; 595 596 static inline uint32_t iso_get_file_size(uint32_t load_rba) 597 { 598 IsoVolDesc *vd = (IsoVolDesc *)sec; 599 IsoDirHdr *cur_record = &vd->vd.primary.rootdir; 600 uint8_t *temp = sec + ISO_SECTOR_SIZE; 601 int level = 0; 602 603 read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec, 604 "Failed to read ISO primary descriptor"); 605 sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); 606 dir_rem[0] = 0; 607 sec_offset[0] = 0; 608 609 while (level >= 0) { 610 IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE, 611 "Directory tree structure violation"); 612 613 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 614 615 if (sec_offset[level] == 0) { 616 read_iso_sector(sec_loc[level], temp, 617 "Failed to read ISO directory"); 618 if (dir_rem[level] == 0) { 619 /* Skip self and parent records */ 620 dir_rem[level] = iso_733_to_u32(cur_record->data_len) - 621 cur_record->dr_len; 622 sec_offset[level] += cur_record->dr_len; 623 624 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 625 dir_rem[level] -= cur_record->dr_len; 626 sec_offset[level] += cur_record->dr_len; 627 continue; 628 } 629 } 630 631 if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) { 632 /* Zero-padding and/or the end of current sector */ 633 dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level]; 634 sec_offset[level] = 0; 635 sec_loc[level]++; 636 } else { 637 /* The directory record is valid */ 638 if (load_rba == iso_733_to_u32(cur_record->ext_loc)) { 639 return iso_733_to_u32(cur_record->data_len); 640 } 641 642 dir_rem[level] -= cur_record->dr_len; 643 sec_offset[level] += cur_record->dr_len; 644 645 if (cur_record->file_flags & 0x2) { 646 /* Subdirectory */ 647 if (level == ISO9660_MAX_DIR_DEPTH - 1) { 648 sclp_print("ISO-9660 directory depth limit exceeded\n"); 649 } else { 650 level++; 651 sec_loc[level] = iso_733_to_u32(cur_record->ext_loc); 652 sec_offset[level] = 0; 653 dir_rem[level] = 0; 654 continue; 655 } 656 } 657 } 658 659 if (dir_rem[level] == 0) { 660 /* Nothing remaining */ 661 level--; 662 read_iso_sector(sec_loc[level], temp, 663 "Failed to read ISO directory"); 664 } 665 } 666 667 return 0; 668 } 669 670 static void load_iso_bc_entry(IsoBcSection *load) 671 { 672 IsoBcSection s = *load; 673 /* 674 * According to spec, extent for each file 675 * is padded and ISO_SECTOR_SIZE bytes aligned 676 */ 677 uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT; 678 uint32_t real_size = iso_get_file_size(bswap32(s.load_rba)); 679 680 if (real_size) { 681 /* Round up blocks to load */ 682 blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; 683 sclp_print("ISO boot image size verified\n"); 684 } else { 685 sclp_print("ISO boot image size could not be verified\n"); 686 } 687 688 read_iso_boot_image(bswap32(s.load_rba), 689 (void *)((uint64_t)bswap16(s.load_segment)), 690 blks_to_load); 691 692 jump_to_low_kernel(); 693 } 694 695 static uint32_t find_iso_bc(void) 696 { 697 IsoVolDesc *vd = (IsoVolDesc *)sec; 698 uint32_t block_num = ISO_PRIMARY_VD_SECTOR; 699 700 if (virtio_read_many(block_num++, sec, 1)) { 701 /* If primary vd cannot be read, there is no boot catalog */ 702 return 0; 703 } 704 705 while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) { 706 if (vd->type == VOL_DESC_TYPE_BOOT) { 707 IsoVdElTorito *et = &vd->vd.boot; 708 709 if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) { 710 return bswap32(et->bc_offset); 711 } 712 } 713 read_iso_sector(block_num++, sec, 714 "Failed to read ISO volume descriptor"); 715 } 716 717 return 0; 718 } 719 720 static IsoBcSection *find_iso_bc_entry(void) 721 { 722 IsoBcEntry *e = (IsoBcEntry *)sec; 723 uint32_t offset = find_iso_bc(); 724 int i; 725 unsigned int loadparm = get_loadparm_index(); 726 727 if (!offset) { 728 return NULL; 729 } 730 731 read_iso_sector(offset, sec, "Failed to read El Torito boot catalog"); 732 733 if (!is_iso_bc_valid(e)) { 734 /* The validation entry is mandatory */ 735 panic("No valid boot catalog found!\n"); 736 return NULL; 737 } 738 739 /* 740 * Each entry has 32 bytes size, so one sector cannot contain > 64 entries. 741 * We consider only boot catalogs with no more than 64 entries. 742 */ 743 for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) { 744 if (e[i].id == ISO_BC_BOOTABLE_SECTION) { 745 if (is_iso_bc_entry_compatible(&e[i].body.sect)) { 746 if (loadparm <= 1) { 747 /* found, default, or unspecified */ 748 return &e[i].body.sect; 749 } 750 loadparm--; 751 } 752 } 753 } 754 755 panic("No suitable boot entry found on ISO-9660 media!\n"); 756 757 return NULL; 758 } 759 760 static void ipl_iso_el_torito(void) 761 { 762 IsoBcSection *s = find_iso_bc_entry(); 763 764 if (s) { 765 load_iso_bc_entry(s); 766 /* no return */ 767 } 768 } 769 770 /*********************************************************************** 771 * Bus specific IPL sequences 772 */ 773 774 static void zipl_load_vblk(void) 775 { 776 if (virtio_guessed_disk_nature()) { 777 virtio_assume_iso9660(); 778 } 779 ipl_iso_el_torito(); 780 781 if (virtio_guessed_disk_nature()) { 782 sclp_print("Using guessed DASD geometry.\n"); 783 virtio_assume_eckd(); 784 } 785 ipl_eckd(); 786 } 787 788 static void zipl_load_vscsi(void) 789 { 790 if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { 791 /* Is it an ISO image in non-CD drive? */ 792 ipl_iso_el_torito(); 793 } 794 795 sclp_print("Using guessed DASD geometry.\n"); 796 virtio_assume_eckd(); 797 ipl_eckd(); 798 } 799 800 /*********************************************************************** 801 * IPL starts here 802 */ 803 804 void zipl_load(void) 805 { 806 VDev *vdev = virtio_get_device(); 807 808 if (vdev->is_cdrom) { 809 ipl_iso_el_torito(); 810 panic("\n! Cannot IPL this ISO image !\n"); 811 } 812 813 if (virtio_get_device_type() == VIRTIO_ID_NET) { 814 jump_to_IPL_code(vdev->netboot_start_addr); 815 } 816 817 ipl_scsi(); 818 819 switch (virtio_get_device_type()) { 820 case VIRTIO_ID_BLOCK: 821 zipl_load_vblk(); 822 break; 823 case VIRTIO_ID_SCSI: 824 zipl_load_vscsi(); 825 break; 826 default: 827 panic("\n! Unknown IPL device type !\n"); 828 } 829 830 panic("\n* this can never happen *\n"); 831 } 832