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 /* prevent unknown IPL types in the guest */ 75 if (iplb.pbt == S390_IPL_TYPE_QEMU_SCSI) { 76 iplb.pbt = S390_IPL_TYPE_CCW; 77 set_iplb(&iplb); 78 } 79 80 /* 81 * The IPL PSW is at address 0. We also must not overwrite the 82 * content of non-BIOS memory after we loaded the guest, so we 83 * save the original content and restore it in jump_to_IPL_2. 84 */ 85 ResetInfo *current = 0; 86 87 save = *current; 88 current->ipl_addr = (uint32_t) (uint64_t) &jump_to_IPL_2; 89 current->ipl_continue = address & 0x7fffffff; 90 91 debug_print_int("set IPL addr to", current->ipl_continue); 92 93 /* Ensure the guest output starts fresh */ 94 sclp_print("\n"); 95 96 /* 97 * HACK ALERT. 98 * We use the load normal reset to keep r15 unchanged. jump_to_IPL_2 99 * can then use r15 as its stack pointer. 100 */ 101 asm volatile("lghi 1,1\n\t" 102 "diag 1,1,0x308\n\t" 103 : : : "1", "memory"); 104 panic("\n! IPL returns !\n"); 105 } 106 107 /*********************************************************************** 108 * IPL an ECKD DASD (CDL or LDL/CMS format) 109 */ 110 111 static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */ 112 static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr); 113 static uint8_t _s2[MAX_SECTOR_SIZE * 3] __attribute__((__aligned__(PAGE_SIZE))); 114 static void *s2_prev_blk = _s2; 115 static void *s2_cur_blk = _s2 + MAX_SECTOR_SIZE; 116 static void *s2_next_blk = _s2 + MAX_SECTOR_SIZE * 2; 117 118 static inline void verify_boot_info(BootInfo *bip) 119 { 120 IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo"); 121 IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version"); 122 IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL"); 123 IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD"); 124 IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch"); 125 IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size), 126 "Bad block size in zIPL section of the 1st record."); 127 } 128 129 static block_number_t eckd_block_num(EckdCHS *chs) 130 { 131 const uint64_t sectors = virtio_get_sectors(); 132 const uint64_t heads = virtio_get_heads(); 133 const uint64_t cylinder = chs->cylinder 134 + ((chs->head & 0xfff0) << 12); 135 const uint64_t head = chs->head & 0x000f; 136 const block_number_t block = sectors * heads * cylinder 137 + sectors * head 138 + chs->sector 139 - 1; /* block nr starts with zero */ 140 return block; 141 } 142 143 static bool eckd_valid_address(BootMapPointer *p) 144 { 145 const uint64_t head = p->eckd.chs.head & 0x000f; 146 147 if (head >= virtio_get_heads() 148 || p->eckd.chs.sector > virtio_get_sectors() 149 || p->eckd.chs.sector <= 0) { 150 return false; 151 } 152 153 if (!virtio_guessed_disk_nature() && 154 eckd_block_num(&p->eckd.chs) >= virtio_get_blocks()) { 155 return false; 156 } 157 158 return true; 159 } 160 161 static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address) 162 { 163 block_number_t block_nr; 164 int j, rc; 165 BootMapPointer *bprs = (void *)_bprs; 166 bool more_data; 167 168 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 169 read_block(blk, bprs, "BPRS read failed"); 170 171 do { 172 more_data = false; 173 for (j = 0;; j++) { 174 block_nr = eckd_block_num(&bprs[j].xeckd.bptr.chs); 175 if (is_null_block_number(block_nr)) { /* end of chunk */ 176 break; 177 } 178 179 /* we need the updated blockno for the next indirect entry 180 * in the chain, but don't want to advance address 181 */ 182 if (j == (max_bprs_entries - 1)) { 183 break; 184 } 185 186 IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size), 187 "bad chunk block size"); 188 IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr"); 189 190 if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]), 191 sizeof(EckdBlockPtr))) { 192 /* This is a "continue" pointer. 193 * This ptr should be the last one in the current 194 * script section. 195 * I.e. the next ptr must point to the unused memory area 196 */ 197 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); 198 read_block(block_nr, bprs, "BPRS continuation read failed"); 199 more_data = true; 200 break; 201 } 202 203 /* Load (count+1) blocks of code at (block_nr) 204 * to memory (address). 205 */ 206 rc = virtio_read_many(block_nr, (void *)(*address), 207 bprs[j].xeckd.bptr.count+1); 208 IPL_assert(rc == 0, "code chunk read failed"); 209 210 *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size(); 211 } 212 } while (more_data); 213 return block_nr; 214 } 215 216 static bool find_zipl_boot_menu_banner(int *offset) 217 { 218 int i; 219 220 /* Menu banner starts with "zIPL" */ 221 for (i = 0; i < virtio_get_block_size() - 4; i++) { 222 if (magic_match(s2_cur_blk + i, ZIPL_MAGIC_EBCDIC)) { 223 *offset = i; 224 return true; 225 } 226 } 227 228 return false; 229 } 230 231 static int eckd_get_boot_menu_index(block_number_t s1b_block_nr) 232 { 233 block_number_t cur_block_nr; 234 block_number_t prev_block_nr = 0; 235 block_number_t next_block_nr = 0; 236 EckdStage1b *s1b = (void *)sec; 237 int banner_offset; 238 int i; 239 240 /* Get Stage1b data */ 241 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 242 read_block(s1b_block_nr, s1b, "Cannot read stage1b boot loader"); 243 244 memset(_s2, FREE_SPACE_FILLER, sizeof(_s2)); 245 246 /* Get Stage2 data */ 247 for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) { 248 cur_block_nr = eckd_block_num(&s1b->seek[i].chs); 249 250 if (!cur_block_nr) { 251 break; 252 } 253 254 read_block(cur_block_nr, s2_cur_blk, "Cannot read stage2 boot loader"); 255 256 if (find_zipl_boot_menu_banner(&banner_offset)) { 257 /* 258 * Load the adjacent blocks to account for the 259 * possibility of menu data spanning multiple blocks. 260 */ 261 if (prev_block_nr) { 262 read_block(prev_block_nr, s2_prev_blk, 263 "Cannot read stage2 boot loader"); 264 } 265 266 if (i + 1 < STAGE2_BLK_CNT_MAX) { 267 next_block_nr = eckd_block_num(&s1b->seek[i + 1].chs); 268 } 269 270 if (next_block_nr) { 271 read_block(next_block_nr, s2_next_blk, 272 "Cannot read stage2 boot loader"); 273 } 274 275 return menu_get_zipl_boot_index(s2_cur_blk + banner_offset); 276 } 277 278 prev_block_nr = cur_block_nr; 279 } 280 281 sclp_print("No zipl boot menu data found. Booting default entry."); 282 return 0; 283 } 284 285 static void run_eckd_boot_script(block_number_t bmt_block_nr, 286 block_number_t s1b_block_nr) 287 { 288 int i; 289 unsigned int loadparm = get_loadparm_index(); 290 block_number_t block_nr; 291 uint64_t address; 292 BootMapTable *bmt = (void *)sec; 293 BootMapScript *bms = (void *)sec; 294 295 if (menu_is_enabled_zipl()) { 296 loadparm = eckd_get_boot_menu_index(s1b_block_nr); 297 } 298 299 debug_print_int("loadparm", loadparm); 300 IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than" 301 " maximum number of boot entries allowed"); 302 303 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 304 read_block(bmt_block_nr, sec, "Cannot read Boot Map Table"); 305 306 block_nr = eckd_block_num(&bmt->entry[loadparm].xeckd.bptr.chs); 307 IPL_assert(block_nr != -1, "Cannot find Boot Map Table Entry"); 308 309 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 310 read_block(block_nr, sec, "Cannot read Boot Map Script"); 311 312 for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD; i++) { 313 address = bms->entry[i].address.load_address; 314 block_nr = eckd_block_num(&bms->entry[i].blkptr.xeckd.bptr.chs); 315 316 do { 317 block_nr = load_eckd_segments(block_nr, &address); 318 } while (block_nr != -1); 319 } 320 321 IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC, 322 "Unknown script entry type"); 323 jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */ 324 } 325 326 static void ipl_eckd_cdl(void) 327 { 328 XEckdMbr *mbr; 329 EckdCdlIpl2 *ipl2 = (void *)sec; 330 IplVolumeLabel *vlbl = (void *)sec; 331 block_number_t bmt_block_nr, s1b_block_nr; 332 333 /* we have just read the block #0 and recognized it as "IPL1" */ 334 sclp_print("CDL\n"); 335 336 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 337 read_block(1, ipl2, "Cannot read IPL2 record at block 1"); 338 339 mbr = &ipl2->mbr; 340 IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record."); 341 IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size), 342 "Bad block size in zIPL section of IPL2 record."); 343 IPL_assert(mbr->dev_type == DEV_TYPE_ECKD, 344 "Non-ECKD device type in zIPL section of IPL2 record."); 345 346 /* save pointer to Boot Map Table */ 347 bmt_block_nr = eckd_block_num(&mbr->blockptr.xeckd.bptr.chs); 348 349 /* save pointer to Stage1b Data */ 350 s1b_block_nr = eckd_block_num(&ipl2->stage1.seek[0].chs); 351 352 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 353 read_block(2, vlbl, "Cannot read Volume Label at block 2"); 354 IPL_assert(magic_match(vlbl->key, VOL1_MAGIC), 355 "Invalid magic of volume label block"); 356 IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC), 357 "Invalid magic of volser block"); 358 print_volser(vlbl->f.volser); 359 360 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 361 /* no return */ 362 } 363 364 static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode) 365 { 366 LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */ 367 char msg[4] = { '?', '.', '\n', '\0' }; 368 369 sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL"); 370 sclp_print(" version "); 371 switch (vlbl->LDL_version) { 372 case LDL1_VERSION: 373 msg[0] = '1'; 374 break; 375 case LDL2_VERSION: 376 msg[0] = '2'; 377 break; 378 default: 379 msg[0] = vlbl->LDL_version; 380 msg[0] &= 0x0f; /* convert EBCDIC */ 381 msg[0] |= 0x30; /* to ASCII (digit) */ 382 msg[1] = '?'; 383 break; 384 } 385 sclp_print(msg); 386 print_volser(vlbl->volser); 387 } 388 389 static void ipl_eckd_ldl(ECKD_IPL_mode_t mode) 390 { 391 block_number_t bmt_block_nr, s1b_block_nr; 392 EckdLdlIpl1 *ipl1 = (void *)sec; 393 394 if (mode != ECKD_LDL_UNLABELED) { 395 print_eckd_ldl_msg(mode); 396 } 397 398 /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */ 399 400 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 401 read_block(0, sec, "Cannot read block 0 to grab boot info."); 402 if (mode == ECKD_LDL_UNLABELED) { 403 if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) { 404 return; /* not applicable layout */ 405 } 406 sclp_print("unlabeled LDL.\n"); 407 } 408 verify_boot_info(&ipl1->bip); 409 410 /* save pointer to Boot Map Table */ 411 bmt_block_nr = eckd_block_num(&ipl1->bip.bp.ipl.bm_ptr.eckd.bptr.chs); 412 413 /* save pointer to Stage1b Data */ 414 s1b_block_nr = eckd_block_num(&ipl1->stage1.seek[0].chs); 415 416 run_eckd_boot_script(bmt_block_nr, s1b_block_nr); 417 /* no return */ 418 } 419 420 static void print_eckd_msg(void) 421 { 422 char msg[] = "Using ECKD scheme (block size *****), "; 423 char *p = &msg[34], *q = &msg[30]; 424 int n = virtio_get_block_size(); 425 426 /* Fill in the block size and show up the message */ 427 if (n > 0 && n <= 99999) { 428 while (n) { 429 *p-- = '0' + (n % 10); 430 n /= 10; 431 } 432 while (p >= q) { 433 *p-- = ' '; 434 } 435 } 436 sclp_print(msg); 437 } 438 439 static void ipl_eckd(void) 440 { 441 XEckdMbr *mbr = (void *)sec; 442 LDL_VTOC *vlbl = (void *)sec; 443 444 print_eckd_msg(); 445 446 /* Grab the MBR again */ 447 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 448 read_block(0, mbr, "Cannot read block 0 on DASD"); 449 450 if (magic_match(mbr->magic, IPL1_MAGIC)) { 451 ipl_eckd_cdl(); /* no return */ 452 } 453 454 /* LDL/CMS? */ 455 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 456 read_block(2, vlbl, "Cannot read block 2"); 457 458 if (magic_match(vlbl->magic, CMS1_MAGIC)) { 459 ipl_eckd_ldl(ECKD_CMS); /* no return */ 460 } 461 if (magic_match(vlbl->magic, LNX1_MAGIC)) { 462 ipl_eckd_ldl(ECKD_LDL); /* no return */ 463 } 464 465 ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ 466 /* 467 * Ok, it is not a LDL by any means. 468 * It still might be a CDL with zero record keys for IPL1 and IPL2 469 */ 470 ipl_eckd_cdl(); 471 } 472 473 /*********************************************************************** 474 * IPL a SCSI disk 475 */ 476 477 static void zipl_load_segment(ComponentEntry *entry) 478 { 479 const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr)); 480 ScsiBlockPtr *bprs = (void *)sec; 481 const int bprs_size = sizeof(sec); 482 block_number_t blockno; 483 uint64_t address; 484 int i; 485 char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ"; 486 char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */ 487 488 blockno = entry->data.blockno; 489 address = entry->load_address; 490 491 debug_print_int("loading segment at block", blockno); 492 debug_print_int("addr", address); 493 494 do { 495 memset(bprs, FREE_SPACE_FILLER, bprs_size); 496 fill_hex_val(blk_no, &blockno, sizeof(blockno)); 497 read_block(blockno, bprs, err_msg); 498 499 for (i = 0;; i++) { 500 uint64_t *cur_desc = (void *)&bprs[i]; 501 502 blockno = bprs[i].blockno; 503 if (!blockno) { 504 break; 505 } 506 507 /* we need the updated blockno for the next indirect entry in the 508 chain, but don't want to advance address */ 509 if (i == (max_entries - 1)) { 510 break; 511 } 512 513 if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1], 514 sizeof(ScsiBlockPtr))) { 515 /* This is a "continue" pointer. 516 * This ptr is the last one in the current script section. 517 * I.e. the next ptr must point to the unused memory area. 518 * The blockno is not zero, so the upper loop must continue 519 * reading next section of BPRS. 520 */ 521 break; 522 } 523 address = virtio_load_direct(cur_desc[0], cur_desc[1], 0, 524 (void *)address); 525 IPL_assert(address != -1, "zIPL load segment failed"); 526 } 527 } while (blockno); 528 } 529 530 /* Run a zipl program */ 531 static void zipl_run(ScsiBlockPtr *pte) 532 { 533 ComponentHeader *header; 534 ComponentEntry *entry; 535 uint8_t tmp_sec[MAX_SECTOR_SIZE]; 536 537 read_block(pte->blockno, tmp_sec, "Cannot read header"); 538 header = (ComponentHeader *)tmp_sec; 539 540 IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); 541 IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); 542 543 dputs("start loading images\n"); 544 545 /* Load image(s) into RAM */ 546 entry = (ComponentEntry *)(&header[1]); 547 while (entry->component_type == ZIPL_COMP_ENTRY_LOAD) { 548 zipl_load_segment(entry); 549 550 entry++; 551 552 IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE), 553 "Wrong entry value"); 554 } 555 556 IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry"); 557 558 /* should not return */ 559 jump_to_IPL_code(entry->load_address); 560 } 561 562 static void ipl_scsi(void) 563 { 564 ScsiMbr *mbr = (void *)sec; 565 int program_table_entries = 0; 566 BootMapTable *prog_table = (void *)sec; 567 unsigned int loadparm = get_loadparm_index(); 568 569 /* Grab the MBR */ 570 memset(sec, FREE_SPACE_FILLER, sizeof(sec)); 571 read_block(0, mbr, "Cannot read block 0"); 572 573 if (!magic_match(mbr->magic, ZIPL_MAGIC)) { 574 return; 575 } 576 577 sclp_print("Using SCSI scheme.\n"); 578 debug_print_int("MBR Version", mbr->version_id); 579 IPL_check(mbr->version_id == 1, 580 "Unknown MBR layout version, assuming version 1"); 581 debug_print_int("program table", mbr->pt.blockno); 582 IPL_assert(mbr->pt.blockno, "No Program Table"); 583 584 /* Parse the program table */ 585 read_block(mbr->pt.blockno, sec, "Error reading Program Table"); 586 IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); 587 588 while (program_table_entries <= MAX_TABLE_ENTRIES) { 589 if (!prog_table->entry[program_table_entries].scsi.blockno) { 590 break; 591 } 592 program_table_entries++; 593 } 594 595 debug_print_int("program table entries", program_table_entries); 596 IPL_assert(program_table_entries != 0, "Empty Program Table"); 597 598 if (menu_is_enabled_enum()) { 599 loadparm = menu_get_enum_boot_index(program_table_entries); 600 } 601 602 debug_print_int("loadparm", loadparm); 603 IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than" 604 " maximum number of boot entries allowed"); 605 606 zipl_run(&prog_table->entry[loadparm].scsi); /* no return */ 607 } 608 609 /*********************************************************************** 610 * IPL El Torito ISO9660 image or DVD 611 */ 612 613 static bool is_iso_bc_entry_compatible(IsoBcSection *s) 614 { 615 uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE); 616 617 if (s->unused || !s->sector_count) { 618 return false; 619 } 620 read_iso_sector(bswap32(s->load_rba), magic_sec, 621 "Failed to read image sector 0"); 622 623 /* Checking bytes 8 - 32 for S390 Linux magic */ 624 return !memcmp(magic_sec + 8, linux_s390_magic, 24); 625 } 626 627 /* Location of the current sector of the directory */ 628 static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH]; 629 /* Offset in the current sector of the directory */ 630 static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH]; 631 /* Remained directory space in bytes */ 632 static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH]; 633 634 static inline uint32_t iso_get_file_size(uint32_t load_rba) 635 { 636 IsoVolDesc *vd = (IsoVolDesc *)sec; 637 IsoDirHdr *cur_record = &vd->vd.primary.rootdir; 638 uint8_t *temp = sec + ISO_SECTOR_SIZE; 639 int level = 0; 640 641 read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec, 642 "Failed to read ISO primary descriptor"); 643 sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); 644 dir_rem[0] = 0; 645 sec_offset[0] = 0; 646 647 while (level >= 0) { 648 IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE, 649 "Directory tree structure violation"); 650 651 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 652 653 if (sec_offset[level] == 0) { 654 read_iso_sector(sec_loc[level], temp, 655 "Failed to read ISO directory"); 656 if (dir_rem[level] == 0) { 657 /* Skip self and parent records */ 658 dir_rem[level] = iso_733_to_u32(cur_record->data_len) - 659 cur_record->dr_len; 660 sec_offset[level] += cur_record->dr_len; 661 662 cur_record = (IsoDirHdr *)(temp + sec_offset[level]); 663 dir_rem[level] -= cur_record->dr_len; 664 sec_offset[level] += cur_record->dr_len; 665 continue; 666 } 667 } 668 669 if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) { 670 /* Zero-padding and/or the end of current sector */ 671 dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level]; 672 sec_offset[level] = 0; 673 sec_loc[level]++; 674 } else { 675 /* The directory record is valid */ 676 if (load_rba == iso_733_to_u32(cur_record->ext_loc)) { 677 return iso_733_to_u32(cur_record->data_len); 678 } 679 680 dir_rem[level] -= cur_record->dr_len; 681 sec_offset[level] += cur_record->dr_len; 682 683 if (cur_record->file_flags & 0x2) { 684 /* Subdirectory */ 685 if (level == ISO9660_MAX_DIR_DEPTH - 1) { 686 sclp_print("ISO-9660 directory depth limit exceeded\n"); 687 } else { 688 level++; 689 sec_loc[level] = iso_733_to_u32(cur_record->ext_loc); 690 sec_offset[level] = 0; 691 dir_rem[level] = 0; 692 continue; 693 } 694 } 695 } 696 697 if (dir_rem[level] == 0) { 698 /* Nothing remaining */ 699 level--; 700 read_iso_sector(sec_loc[level], temp, 701 "Failed to read ISO directory"); 702 } 703 } 704 705 return 0; 706 } 707 708 static void load_iso_bc_entry(IsoBcSection *load) 709 { 710 IsoBcSection s = *load; 711 /* 712 * According to spec, extent for each file 713 * is padded and ISO_SECTOR_SIZE bytes aligned 714 */ 715 uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT; 716 uint32_t real_size = iso_get_file_size(bswap32(s.load_rba)); 717 718 if (real_size) { 719 /* Round up blocks to load */ 720 blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; 721 sclp_print("ISO boot image size verified\n"); 722 } else { 723 sclp_print("ISO boot image size could not be verified\n"); 724 } 725 726 read_iso_boot_image(bswap32(s.load_rba), 727 (void *)((uint64_t)bswap16(s.load_segment)), 728 blks_to_load); 729 730 /* Trying to get PSW at zero address */ 731 if (*((uint64_t *)0) & IPL_PSW_MASK) { 732 jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff); 733 } 734 735 /* Try default linux start address */ 736 jump_to_IPL_code(KERN_IMAGE_START); 737 } 738 739 static uint32_t find_iso_bc(void) 740 { 741 IsoVolDesc *vd = (IsoVolDesc *)sec; 742 uint32_t block_num = ISO_PRIMARY_VD_SECTOR; 743 744 if (virtio_read_many(block_num++, sec, 1)) { 745 /* If primary vd cannot be read, there is no boot catalog */ 746 return 0; 747 } 748 749 while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) { 750 if (vd->type == VOL_DESC_TYPE_BOOT) { 751 IsoVdElTorito *et = &vd->vd.boot; 752 753 if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) { 754 return bswap32(et->bc_offset); 755 } 756 } 757 read_iso_sector(block_num++, sec, 758 "Failed to read ISO volume descriptor"); 759 } 760 761 return 0; 762 } 763 764 static IsoBcSection *find_iso_bc_entry(void) 765 { 766 IsoBcEntry *e = (IsoBcEntry *)sec; 767 uint32_t offset = find_iso_bc(); 768 int i; 769 unsigned int loadparm = get_loadparm_index(); 770 771 if (!offset) { 772 return NULL; 773 } 774 775 read_iso_sector(offset, sec, "Failed to read El Torito boot catalog"); 776 777 if (!is_iso_bc_valid(e)) { 778 /* The validation entry is mandatory */ 779 panic("No valid boot catalog found!\n"); 780 return NULL; 781 } 782 783 /* 784 * Each entry has 32 bytes size, so one sector cannot contain > 64 entries. 785 * We consider only boot catalogs with no more than 64 entries. 786 */ 787 for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) { 788 if (e[i].id == ISO_BC_BOOTABLE_SECTION) { 789 if (is_iso_bc_entry_compatible(&e[i].body.sect)) { 790 if (loadparm <= 1) { 791 /* found, default, or unspecified */ 792 return &e[i].body.sect; 793 } 794 loadparm--; 795 } 796 } 797 } 798 799 panic("No suitable boot entry found on ISO-9660 media!\n"); 800 801 return NULL; 802 } 803 804 static void ipl_iso_el_torito(void) 805 { 806 IsoBcSection *s = find_iso_bc_entry(); 807 808 if (s) { 809 load_iso_bc_entry(s); 810 /* no return */ 811 } 812 } 813 814 /*********************************************************************** 815 * Bus specific IPL sequences 816 */ 817 818 static void zipl_load_vblk(void) 819 { 820 if (virtio_guessed_disk_nature()) { 821 virtio_assume_iso9660(); 822 } 823 ipl_iso_el_torito(); 824 825 if (virtio_guessed_disk_nature()) { 826 sclp_print("Using guessed DASD geometry.\n"); 827 virtio_assume_eckd(); 828 } 829 ipl_eckd(); 830 } 831 832 static void zipl_load_vscsi(void) 833 { 834 if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { 835 /* Is it an ISO image in non-CD drive? */ 836 ipl_iso_el_torito(); 837 } 838 839 sclp_print("Using guessed DASD geometry.\n"); 840 virtio_assume_eckd(); 841 ipl_eckd(); 842 } 843 844 /*********************************************************************** 845 * IPL starts here 846 */ 847 848 void zipl_load(void) 849 { 850 VDev *vdev = virtio_get_device(); 851 852 if (vdev->is_cdrom) { 853 ipl_iso_el_torito(); 854 panic("\n! Cannot IPL this ISO image !\n"); 855 } 856 857 if (virtio_get_device_type() == VIRTIO_ID_NET) { 858 jump_to_IPL_code(vdev->netboot_start_addr); 859 } 860 861 ipl_scsi(); 862 863 switch (virtio_get_device_type()) { 864 case VIRTIO_ID_BLOCK: 865 zipl_load_vblk(); 866 break; 867 case VIRTIO_ID_SCSI: 868 zipl_load_vscsi(); 869 break; 870 default: 871 panic("\n! Unknown IPL device type !\n"); 872 } 873 874 panic("\n* this can never happen *\n"); 875 } 876