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 typedef struct ResetInfo { 33 uint32_t ipl_mask; 34 uint32_t ipl_addr; 35 uint32_t ipl_continue; 36 } ResetInfo; 37 38 static ResetInfo save; 39 40 const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION" 41 "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; 42 43 /* 44 * Match two CCWs located after PSW and eight filler bytes. 45 * From libmagic and arch/s390/kernel/head.S. 46 */ 47 const uint8_t linux_s390_magic[] = "\x02\x00\x00\x18\x60\x00\x00\x50\x02\x00" 48 "\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40" 49 "\x40\x40\x40\x40"; 50 51 static inline bool is_iso_vd_valid(IsoVolDesc *vd) 52 { 53 const uint8_t vol_desc_magic[] = "CD001"; 54 55 return !memcmp(&vd->ident[0], vol_desc_magic, 5) && 56 vd->version == 0x1 && 57 vd->type <= VOL_DESC_TYPE_PARTITION; 58 } 59 60 static void jump_to_IPL_2(void) 61 { 62 ResetInfo *current = 0; 63 64 void (*ipl)(void) = (void *) (uint64_t) current->ipl_continue; 65 *current = save; 66 ipl(); /* should not return */ 67 } 68 69 static void jump_to_IPL_code(uint64_t address) 70 { 71 /* store the subsystem information _after_ the bootmap was loaded */ 72 write_subsystem_identification(); 73 /* 74 * The IPL PSW is at address 0. We also must not overwrite the 75 * content of non-BIOS memory after we loaded the guest, so we 76 * save the original content and restore it in jump_to_IPL_2. 77 */ 78 ResetInfo *current = 0; 79 80 save = *current; 81 current->ipl_addr = (uint32_t) (uint64_t) &jump_to_IPL_2; 82 current->ipl_continue = address & 0x7fffffff; 83 84 debug_print_int("set IPL addr to", current->ipl_continue); 85 86 /* Ensure the guest output starts fresh */ 87 sclp_print("\n"); 88 89 /* 90 * HACK ALERT. 91 * We use the load normal reset to keep r15 unchanged. jump_to_IPL_2 92 * can then use r15 as its stack pointer. 93 */ 94 asm volatile("lghi 1,1\n\t" 95 "diag 1,1,0x308\n\t" 96 : : : "1", "memory"); 97 panic("\n! IPL returns !\n"); 98 } 99 100 /*********************************************************************** 101 * IPL an ECKD DASD (CDL or LDL/CMS format) 102 */ 103 104 static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */ 105 static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr); 106 static uint8_t _s2[MAX_SECTOR_SIZE * 3] __attribute__((__aligned__(PAGE_SIZE))); 107 static void *s2_prev_blk = _s2; 108 static void *s2_cur_blk = _s2 + MAX_SECTOR_SIZE; 109 static void *s2_next_blk = _s2 + MAX_SECTOR_SIZE * 2; 110 111 static inline void verify_boot_info(BootInfo *bip) 112 { 113 IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo"); 114 IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version"); 115 IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL"); 116 IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD"); 117 IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch"); 118 IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size), 119 "Bad block size in zIPL section of the 1st record."); 120 } 121 122 static block_number_t eckd_block_num(EckdCHS *chs) 123 { 124 const uint64_t sectors = virtio_get_sectors(); 125 const uint64_t heads = virtio_get_heads(); 126 const uint64_t cylinder = chs->cylinder 127 + ((chs->head & 0xfff0) << 12); 128 const uint64_t head = chs->head & 0x000f; 129 const block_number_t block = sectors * heads * cylinder 130 + sectors * head 131 + chs->sector 132 - 1; /* block nr starts with zero */ 133 return block; 134 } 135 136 static bool eckd_valid_address(BootMapPointer *p) 137 { 138 const uint64_t head = p->eckd.chs.head & 0x000f; 139 140 if (head >= virtio_get_heads() 141 || p->eckd.chs.sector > virtio_get_sectors() 142 || p->eckd.chs.sector <= 0) { 143 return false; 144 } 145 146 if (!virtio_guessed_disk_nature() && 147 eckd_block_num(&p->eckd.chs) >= virtio_get_blocks()) { 148 return false; 149 } 150 151 return true; 152 } 153 154 static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address) 155 { 156 block_number_t block_nr; 157 int j, rc; 158 BootMapPointer *bprs = (void *)_bprs; 159 bool more_data; 160 161 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 162 read_block(blk, bprs, "BPRS read failed"); 163 164 do { 165 more_data = false; 166 for (j = 0;; j++) { 167 block_nr = eckd_block_num(&bprs[j].xeckd.bptr.chs); 168 if (is_null_block_number(block_nr)) { /* end of chunk */ 169 break; 170 } 171 172 /* we need the updated blockno for the next indirect entry 173 * in the chain, but don't want to advance address 174 */ 175 if (j == (max_bprs_entries - 1)) { 176 break; 177 } 178 179 IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size), 180 "bad chunk block size"); 181 IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr"); 182 183 if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]), 184 sizeof(EckdBlockPtr))) { 185 /* This is a "continue" pointer. 186 * This ptr should be the last one in the current 187 * script section. 188 * I.e. the next ptr must point to the unused memory area 189 */ 190 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 191 read_block(block_nr, bprs, "BPRS continuation read failed"); 192 more_data = true; 193 break; 194 } 195 196 /* Load (count+1) blocks of code at (block_nr) 197 * to memory (address). 198 */ 199 rc = virtio_read_many(block_nr, (void *)(*address), 200 bprs[j].xeckd.bptr.count+1); 201 IPL_assert(rc == 0, "code chunk read failed"); 202 203 *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size(); 204 } 205 } while (more_data); 206 return block_nr; 207 } 208 209 static bool find_zipl_boot_menu_banner(int *offset) 210 { 211 int i; 212 213 /* Menu banner starts with "zIPL" */ 214 for (i = 0; i < virtio_get_block_size() - 4; i++) { 215 if (magic_match(s2_cur_blk + i, ZIPL_MAGIC_EBCDIC)) { 216 *offset = i; 217 return true; 218 } 219 } 220 221 return false; 222 } 223 224 static int eckd_get_boot_menu_index(block_number_t s1b_block_nr) 225 { 226 block_number_t cur_block_nr; 227 block_number_t prev_block_nr = 0; 228 block_number_t next_block_nr = 0; 229 EckdStage1b *s1b = (void *)sec; 230 int banner_offset; 231 int i; 232 233 /* Get Stage1b data */ 234 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 235 read_block(s1b_block_nr, s1b, "Cannot read stage1b boot loader"); 236 237 memset(_s2, FREE_SPACE_FILLER, sizeof(_s2)); 238 239 /* Get Stage2 data */ 240 for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) { 241 cur_block_nr = eckd_block_num(&s1b->seek[i].chs); 242 243 if (!cur_block_nr) { 244 break; 245 } 246 247 read_block(cur_block_nr, s2_cur_blk, "Cannot read stage2 boot loader"); 248 249 if (find_zipl_boot_menu_banner(&banner_offset)) { 250 /* 251 * Load the adjacent blocks to account for the 252 * possibility of menu data spanning multiple blocks. 253 */ 254 if (prev_block_nr) { 255 read_block(prev_block_nr, s2_prev_blk, 256 "Cannot read stage2 boot loader"); 257 } 258 259 if (i + 1 < STAGE2_BLK_CNT_MAX) { 260 next_block_nr = eckd_block_num(&s1b->seek[i + 1].chs); 261 } 262 263 if (next_block_nr) { 264 read_block(next_block_nr, s2_next_blk, 265 "Cannot read stage2 boot loader"); 266 } 267 268 return menu_get_zipl_boot_index(s2_cur_blk + banner_offset); 269 } 270 271 prev_block_nr = cur_block_nr; 272 } 273 274 sclp_print("No zipl boot menu data found. Booting default entry."); 275 return 0; 276 } 277 278 static void run_eckd_boot_script(block_number_t bmt_block_nr, 279 block_number_t s1b_block_nr) 280 { 281 int i; 282 unsigned int loadparm = get_loadparm_index(); 283 block_number_t block_nr; 284 uint64_t address; 285 BootMapTable *bmt = (void *)sec; 286 BootMapScript *bms = (void *)sec; 287 288 if (menu_is_enabled_zipl()) { 289 loadparm = eckd_get_boot_menu_index(s1b_block_nr); 290 } 291 292 debug_print_int("loadparm", loadparm); 293 IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than" 294 " maximum number of boot entries allowed"); 295 296 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 297 read_block(bmt_block_nr, sec, "Cannot read Boot Map Table"); 298 299 block_nr = eckd_block_num(&bmt->entry[loadparm].xeckd.bptr.chs); 300 IPL_assert(block_nr != -1, "Cannot find Boot Map Table Entry"); 301 302 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 303 read_block(block_nr, sec, "Cannot read Boot Map Script"); 304 305 for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD; i++) { 306 address = bms->entry[i].address.load_address; 307 block_nr = eckd_block_num(&bms->entry[i].blkptr.xeckd.bptr.chs); 308 309 do { 310 block_nr = load_eckd_segments(block_nr, &address); 311 } while (block_nr != -1); 312 } 313 314 IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC, 315 "Unknown script entry type"); 316 jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */ 317 } 318 319 static void ipl_eckd_cdl(void) 320 { 321 XEckdMbr *mbr; 322 EckdCdlIpl2 *ipl2 = (void *)sec; 323 IplVolumeLabel *vlbl = (void *)sec; 324 block_number_t bmt_block_nr, s1b_block_nr; 325 326 /* we have just read the block #0 and recognized it as "IPL1" */ 327 sclp_print("CDL\n"); 328 329 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 330 read_block(1, ipl2, "Cannot read IPL2 record at block 1"); 331 332 mbr = &ipl2->mbr; 333 IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record."); 334 IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size), 335 "Bad block size in zIPL section of IPL2 record."); 336 IPL_assert(mbr->dev_type == DEV_TYPE_ECKD, 337 "Non-ECKD device type in zIPL section of IPL2 record."); 338 339 /* save pointer to Boot Map Table */ 340 bmt_block_nr = eckd_block_num(&mbr->blockptr.xeckd.bptr.chs); 341 342 /* save pointer to Stage1b Data */ 343 s1b_block_nr = eckd_block_num(&ipl2->stage1.seek[0].chs); 344 345 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 346 read_block(2, vlbl, "Cannot read Volume Label at block 2"); 347 IPL_assert(magic_match(vlbl->key, VOL1_MAGIC), 348 "Invalid magic of volume label block"); 349 IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC), 350 "Invalid magic of volser block"); 351 print_volser(vlbl->f.volser); 352 353 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 354 /* no return */ 355 } 356 357 static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode) 358 { 359 LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */ 360 char msg[4] = { '?', '.', '\n', '\0' }; 361 362 sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL"); 363 sclp_print(" version "); 364 switch (vlbl->LDL_version) { 365 case LDL1_VERSION: 366 msg[0] = '1'; 367 break; 368 case LDL2_VERSION: 369 msg[0] = '2'; 370 break; 371 default: 372 msg[0] = vlbl->LDL_version; 373 msg[0] &= 0x0f; /* convert EBCDIC */ 374 msg[0] |= 0x30; /* to ASCII (digit) */ 375 msg[1] = '?'; 376 break; 377 } 378 sclp_print(msg); 379 print_volser(vlbl->volser); 380 } 381 382 static void ipl_eckd_ldl(ECKD_IPL_mode_t mode) 383 { 384 block_number_t bmt_block_nr, s1b_block_nr; 385 EckdLdlIpl1 *ipl1 = (void *)sec; 386 387 if (mode != ECKD_LDL_UNLABELED) { 388 print_eckd_ldl_msg(mode); 389 } 390 391 /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */ 392 393 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 394 read_block(0, sec, "Cannot read block 0 to grab boot info."); 395 if (mode == ECKD_LDL_UNLABELED) { 396 if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) { 397 return; /* not applicable layout */ 398 } 399 sclp_print("unlabeled LDL.\n"); 400 } 401 verify_boot_info(&ipl1->bip); 402 403 /* save pointer to Boot Map Table */ 404 bmt_block_nr = eckd_block_num(&ipl1->bip.bp.ipl.bm_ptr.eckd.bptr.chs); 405 406 /* save pointer to Stage1b Data */ 407 s1b_block_nr = eckd_block_num(&ipl1->stage1.seek[0].chs); 408 409 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 410 /* no return */ 411 } 412 413 static void print_eckd_msg(void) 414 { 415 char msg[] = "Using ECKD scheme (block size *****), "; 416 char *p = &msg[34], *q = &msg[30]; 417 int n = virtio_get_block_size(); 418 419 /* Fill in the block size and show up the message */ 420 if (n > 0 && n <= 99999) { 421 while (n) { 422 *p-- = '0' + (n % 10); 423 n /= 10; 424 } 425 while (p >= q) { 426 *p-- = ' '; 427 } 428 } 429 sclp_print(msg); 430 } 431 432 static void ipl_eckd(void) 433 { 434 XEckdMbr *mbr = (void *)sec; 435 LDL_VTOC *vlbl = (void *)sec; 436 437 print_eckd_msg(); 438 439 /* Grab the MBR again */ 440 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 441 read_block(0, mbr, "Cannot read block 0 on DASD"); 442 443 if (magic_match(mbr->magic, IPL1_MAGIC)) { 444 ipl_eckd_cdl(); /* no return */ 445 } 446 447 /* LDL/CMS? */ 448 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 449 read_block(2, vlbl, "Cannot read block 2"); 450 451 if (magic_match(vlbl->magic, CMS1_MAGIC)) { 452 ipl_eckd_ldl(ECKD_CMS); /* no return */ 453 } 454 if (magic_match(vlbl->magic, LNX1_MAGIC)) { 455 ipl_eckd_ldl(ECKD_LDL); /* no return */ 456 } 457 458 ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ 459 /* 460 * Ok, it is not a LDL by any means. 461 * It still might be a CDL with zero record keys for IPL1 and IPL2 462 */ 463 ipl_eckd_cdl(); 464 } 465 466 /*********************************************************************** 467 * IPL a SCSI disk 468 */ 469 470 static void zipl_load_segment(ComponentEntry *entry) 471 { 472 const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr)); 473 ScsiBlockPtr *bprs = (void *)sec; 474 const int bprs_size = sizeof(sec); 475 block_number_t blockno; 476 uint64_t address; 477 int i; 478 char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ"; 479 char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */ 480 481 blockno = entry->data.blockno; 482 address = entry->load_address; 483 484 debug_print_int("loading segment at block", blockno); 485 debug_print_int("addr", address); 486 487 do { 488 memset(bprs, FREE_SPACE_FILLER, bprs_size); 489 fill_hex_val(blk_no, &blockno, sizeof(blockno)); 490 read_block(blockno, bprs, err_msg); 491 492 for (i = 0;; i++) { 493 uint64_t *cur_desc = (void *)&bprs[i]; 494 495 blockno = bprs[i].blockno; 496 if (!blockno) { 497 break; 498 } 499 500 /* we need the updated blockno for the next indirect entry in the 501 chain, but don't want to advance address */ 502 if (i == (max_entries - 1)) { 503 break; 504 } 505 506 if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1], 507 sizeof(ScsiBlockPtr))) { 508 /* This is a "continue" pointer. 509 * This ptr is the last one in the current script section. 510 * I.e. the next ptr must point to the unused memory area. 511 * The blockno is not zero, so the upper loop must continue 512 * reading next section of BPRS. 513 */ 514 break; 515 } 516 address = virtio_load_direct(cur_desc[0], cur_desc[1], 0, 517 (void *)address); 518 IPL_assert(address != -1, "zIPL load segment failed"); 519 } 520 } while (blockno); 521 } 522 523 /* Run a zipl program */ 524 static void zipl_run(ScsiBlockPtr *pte) 525 { 526 ComponentHeader *header; 527 ComponentEntry *entry; 528 uint8_t tmp_sec[MAX_SECTOR_SIZE]; 529 530 read_block(pte->blockno, tmp_sec, "Cannot read header"); 531 header = (ComponentHeader *)tmp_sec; 532 533 IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); 534 IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); 535 536 dputs("start loading images\n"); 537 538 /* Load image(s) into RAM */ 539 entry = (ComponentEntry *)(&header[1]); 540 while (entry->component_type == ZIPL_COMP_ENTRY_LOAD) { 541 zipl_load_segment(entry); 542 543 entry++; 544 545 IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE), 546 "Wrong entry value"); 547 } 548 549 IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry"); 550 551 /* should not return */ 552 jump_to_IPL_code(entry->load_address); 553 } 554 555 static void ipl_scsi(void) 556 { 557 ScsiMbr *mbr = (void *)sec; 558 int program_table_entries = 0; 559 BootMapTable *prog_table = (void *)sec; 560 unsigned int loadparm = get_loadparm_index(); 561 562 /* Grab the MBR */ 563 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 564 read_block(0, mbr, "Cannot read block 0"); 565 566 if (!magic_match(mbr->magic, ZIPL_MAGIC)) { 567 return; 568 } 569 570 sclp_print("Using SCSI scheme.\n"); 571 debug_print_int("MBR Version", mbr->version_id); 572 IPL_check(mbr->version_id == 1, 573 "Unknown MBR layout version, assuming version 1"); 574 debug_print_int("program table", mbr->pt.blockno); 575 IPL_assert(mbr->pt.blockno, "No Program Table"); 576 577 /* Parse the program table */ 578 read_block(mbr->pt.blockno, sec, "Error reading Program Table"); 579 IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); 580 581 while (program_table_entries <= MAX_TABLE_ENTRIES) { 582 if (!prog_table->entry[program_table_entries].scsi.blockno) { 583 break; 584 } 585 program_table_entries++; 586 } 587 588 debug_print_int("program table entries", program_table_entries); 589 IPL_assert(program_table_entries != 0, "Empty Program Table"); 590 591 if (menu_is_enabled_enum()) { 592 loadparm = menu_get_enum_boot_index(program_table_entries); 593 } 594 595 debug_print_int("loadparm", loadparm); 596 IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than" 597 " maximum number of boot entries allowed"); 598 599 zipl_run(&prog_table->entry[loadparm].scsi); /* no return */ 600 } 601 602 /*********************************************************************** 603 * IPL El Torito ISO9660 image or DVD 604 */ 605 606 static bool is_iso_bc_entry_compatible(IsoBcSection *s) 607 { 608 uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE); 609 610 if (s->unused || !s->sector_count) { 611 return false; 612 } 613 read_iso_sector(bswap32(s->load_rba), magic_sec, 614 "Failed to read image sector 0"); 615 616 /* Checking bytes 8 - 32 for S390 Linux magic */ 617 return !memcmp(magic_sec + 8, linux_s390_magic, 24); 618 } 619 620 /* Location of the current sector of the directory */ 621 static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH]; 622 /* Offset in the current sector of the directory */ 623 static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH]; 624 /* Remained directory space in bytes */ 625 static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH]; 626 627 static inline uint32_t iso_get_file_size(uint32_t load_rba) 628 { 629 IsoVolDesc *vd = (IsoVolDesc *)sec; 630 IsoDirHdr *cur_record = &vd->vd.primary.rootdir; 631 uint8_t *temp = sec + ISO_SECTOR_SIZE; 632 int level = 0; 633 634 read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec, 635 "Failed to read ISO primary descriptor"); 636 sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); 637 dir_rem[0] = 0; 638 sec_offset[0] = 0; 639 640 while (level >= 0) { 641 IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE, 642 "Directory tree structure violation"); 643 644 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 645 646 if (sec_offset[level] == 0) { 647 read_iso_sector(sec_loc[level], temp, 648 "Failed to read ISO directory"); 649 if (dir_rem[level] == 0) { 650 /* Skip self and parent records */ 651 dir_rem[level] = iso_733_to_u32(cur_record->data_len) - 652 cur_record->dr_len; 653 sec_offset[level] += cur_record->dr_len; 654 655 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 656 dir_rem[level] -= cur_record->dr_len; 657 sec_offset[level] += cur_record->dr_len; 658 continue; 659 } 660 } 661 662 if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) { 663 /* Zero-padding and/or the end of current sector */ 664 dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level]; 665 sec_offset[level] = 0; 666 sec_loc[level]++; 667 } else { 668 /* The directory record is valid */ 669 if (load_rba == iso_733_to_u32(cur_record->ext_loc)) { 670 return iso_733_to_u32(cur_record->data_len); 671 } 672 673 dir_rem[level] -= cur_record->dr_len; 674 sec_offset[level] += cur_record->dr_len; 675 676 if (cur_record->file_flags & 0x2) { 677 /* Subdirectory */ 678 if (level == ISO9660_MAX_DIR_DEPTH - 1) { 679 sclp_print("ISO-9660 directory depth limit exceeded\n"); 680 } else { 681 level++; 682 sec_loc[level] = iso_733_to_u32(cur_record->ext_loc); 683 sec_offset[level] = 0; 684 dir_rem[level] = 0; 685 continue; 686 } 687 } 688 } 689 690 if (dir_rem[level] == 0) { 691 /* Nothing remaining */ 692 level--; 693 read_iso_sector(sec_loc[level], temp, 694 "Failed to read ISO directory"); 695 } 696 } 697 698 return 0; 699 } 700 701 static void load_iso_bc_entry(IsoBcSection *load) 702 { 703 IsoBcSection s = *load; 704 /* 705 * According to spec, extent for each file 706 * is padded and ISO_SECTOR_SIZE bytes aligned 707 */ 708 uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT; 709 uint32_t real_size = iso_get_file_size(bswap32(s.load_rba)); 710 711 if (real_size) { 712 /* Round up blocks to load */ 713 blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; 714 sclp_print("ISO boot image size verified\n"); 715 } else { 716 sclp_print("ISO boot image size could not be verified\n"); 717 } 718 719 read_iso_boot_image(bswap32(s.load_rba), 720 (void *)((uint64_t)bswap16(s.load_segment)), 721 blks_to_load); 722 723 /* Trying to get PSW at zero address */ 724 if (*((uint64_t *)0) & IPL_PSW_MASK) { 725 jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff); 726 } 727 728 /* Try default linux start address */ 729 jump_to_IPL_code(KERN_IMAGE_START); 730 } 731 732 static uint32_t find_iso_bc(void) 733 { 734 IsoVolDesc *vd = (IsoVolDesc *)sec; 735 uint32_t block_num = ISO_PRIMARY_VD_SECTOR; 736 737 if (virtio_read_many(block_num++, sec, 1)) { 738 /* If primary vd cannot be read, there is no boot catalog */ 739 return 0; 740 } 741 742 while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) { 743 if (vd->type == VOL_DESC_TYPE_BOOT) { 744 IsoVdElTorito *et = &vd->vd.boot; 745 746 if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) { 747 return bswap32(et->bc_offset); 748 } 749 } 750 read_iso_sector(block_num++, sec, 751 "Failed to read ISO volume descriptor"); 752 } 753 754 return 0; 755 } 756 757 static IsoBcSection *find_iso_bc_entry(void) 758 { 759 IsoBcEntry *e = (IsoBcEntry *)sec; 760 uint32_t offset = find_iso_bc(); 761 int i; 762 unsigned int loadparm = get_loadparm_index(); 763 764 if (!offset) { 765 return NULL; 766 } 767 768 read_iso_sector(offset, sec, "Failed to read El Torito boot catalog"); 769 770 if (!is_iso_bc_valid(e)) { 771 /* The validation entry is mandatory */ 772 panic("No valid boot catalog found!\n"); 773 return NULL; 774 } 775 776 /* 777 * Each entry has 32 bytes size, so one sector cannot contain > 64 entries. 778 * We consider only boot catalogs with no more than 64 entries. 779 */ 780 for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) { 781 if (e[i].id == ISO_BC_BOOTABLE_SECTION) { 782 if (is_iso_bc_entry_compatible(&e[i].body.sect)) { 783 if (loadparm <= 1) { 784 /* found, default, or unspecified */ 785 return &e[i].body.sect; 786 } 787 loadparm--; 788 } 789 } 790 } 791 792 panic("No suitable boot entry found on ISO-9660 media!\n"); 793 794 return NULL; 795 } 796 797 static void ipl_iso_el_torito(void) 798 { 799 IsoBcSection *s = find_iso_bc_entry(); 800 801 if (s) { 802 load_iso_bc_entry(s); 803 /* no return */ 804 } 805 } 806 807 /*********************************************************************** 808 * Bus specific IPL sequences 809 */ 810 811 static void zipl_load_vblk(void) 812 { 813 if (virtio_guessed_disk_nature()) { 814 virtio_assume_iso9660(); 815 } 816 ipl_iso_el_torito(); 817 818 if (virtio_guessed_disk_nature()) { 819 sclp_print("Using guessed DASD geometry.\n"); 820 virtio_assume_eckd(); 821 } 822 ipl_eckd(); 823 } 824 825 static void zipl_load_vscsi(void) 826 { 827 if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { 828 /* Is it an ISO image in non-CD drive? */ 829 ipl_iso_el_torito(); 830 } 831 832 sclp_print("Using guessed DASD geometry.\n"); 833 virtio_assume_eckd(); 834 ipl_eckd(); 835 } 836 837 /*********************************************************************** 838 * IPL starts here 839 */ 840 841 void zipl_load(void) 842 { 843 VDev *vdev = virtio_get_device(); 844 845 if (vdev->is_cdrom) { 846 ipl_iso_el_torito(); 847 panic("\n! Cannot IPL this ISO image !\n"); 848 } 849 850 if (virtio_get_device_type() == VIRTIO_ID_NET) { 851 jump_to_IPL_code(vdev->netboot_start_addr); 852 } 853 854 ipl_scsi(); 855 856 switch (virtio_get_device_type()) { 857 case VIRTIO_ID_BLOCK: 858 zipl_load_vblk(); 859 break; 860 case VIRTIO_ID_SCSI: 861 zipl_load_vscsi(); 862 break; 863 default: 864 panic("\n! Unknown IPL device type !\n"); 865 } 866 867 panic("\n* this can never happen *\n"); 868 } 869