1 /* 2 * QEMU S390 bootmap interpreter -- declarations 3 * 4 * Copyright 2014 IBM Corp. 5 * Author(s): Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or (at 8 * your option) any later version. See the COPYING file in the top-level 9 * directory. 10 */ 11 #ifndef _PC_BIOS_S390_CCW_BOOTMAP_H 12 #define _PC_BIOS_S390_CCW_BOOTMAP_H 13 14 #include "s390-ccw.h" 15 #include "virtio.h" 16 17 typedef uint64_t block_number_t; 18 #define NULL_BLOCK_NR 0xffffffffffffffffULL 19 20 #define FREE_SPACE_FILLER '\xAA' 21 22 typedef struct ScsiBlockPtr { 23 uint64_t blockno; 24 uint16_t size; 25 uint16_t blockct; 26 uint8_t reserved[4]; 27 } __attribute__ ((packed)) ScsiBlockPtr; 28 29 typedef struct FbaBlockPtr { 30 uint32_t blockno; 31 uint16_t size; 32 uint16_t blockct; 33 } __attribute__ ((packed)) FbaBlockPtr; 34 35 typedef struct EckdCHS { 36 uint16_t cylinder; 37 uint16_t head; 38 uint8_t sector; 39 } __attribute__ ((packed)) EckdCHS; 40 41 typedef struct EckdBlockPtr { 42 EckdCHS chs; /* cylinder/head/sector is an address of the block */ 43 uint16_t size; 44 uint8_t count; /* (size_in_blocks-1); 45 * it's 0 for TablePtr, ScriptPtr, and SectionPtr */ 46 } __attribute__ ((packed)) EckdBlockPtr; 47 48 typedef struct LdEckdCHS { 49 uint32_t cylinder; 50 uint8_t head; 51 uint8_t sector; 52 } __attribute__ ((packed)) LdEckdCHS; 53 54 typedef struct LdEckdBlockPtr { 55 LdEckdCHS chs; /* cylinder/head/sector is an address of the block */ 56 uint8_t reserved[4]; 57 uint16_t count; 58 uint32_t pad; 59 } __attribute__ ((packed)) LdEckdBlockPtr; 60 61 /* bptr is used for CCW type IPL, while ldptr is for list-directed IPL */ 62 typedef union ExtEckdBlockPtr { 63 EckdBlockPtr bptr; 64 LdEckdBlockPtr ldptr; 65 } __attribute__ ((packed)) ExtEckdBlockPtr; 66 67 typedef union BootMapPointer { 68 ScsiBlockPtr scsi; 69 FbaBlockPtr fba; 70 EckdBlockPtr eckd; 71 ExtEckdBlockPtr xeckd; 72 } __attribute__ ((packed)) BootMapPointer; 73 74 typedef struct BootRecord { 75 uint8_t magic[4]; 76 uint32_t version; 77 uint64_t res1; 78 BootMapPointer pgt; 79 uint8_t reserved[510 - 32]; 80 uint16_t os_id; 81 } __attribute__ ((packed)) BootRecord; 82 83 /* aka Program Table */ 84 typedef struct BootMapTable { 85 uint8_t magic[4]; 86 uint8_t reserved[12]; 87 BootMapPointer entry[]; 88 } __attribute__ ((packed)) BootMapTable; 89 90 typedef union ComponentEntryData { 91 uint64_t load_psw; 92 uint64_t load_addr; 93 } ComponentEntryData; 94 95 typedef struct ComponentEntry { 96 ScsiBlockPtr data; 97 uint8_t pad[7]; 98 uint8_t component_type; 99 ComponentEntryData compdat; 100 } __attribute((packed)) ComponentEntry; 101 102 typedef struct ComponentHeader { 103 uint8_t magic[4]; /* == "zIPL" */ 104 uint8_t type; /* == ZIPL_COMP_HEADER_* */ 105 uint8_t reserved[27]; 106 } __attribute((packed)) ComponentHeader; 107 108 typedef struct ScsiMbr { 109 uint8_t magic[4]; 110 uint32_t version_id; 111 uint8_t reserved[8]; 112 ScsiBlockPtr pt; /* block pointer to program table */ 113 } __attribute__ ((packed)) ScsiMbr; 114 115 #define ZIPL_MAGIC "zIPL" 116 #define ZIPL_MAGIC_EBCDIC "\xa9\xc9\xd7\xd3" 117 #define IPL1_MAGIC "\xc9\xd7\xd3\xf1" /* == "IPL1" in EBCDIC */ 118 #define IPL2_MAGIC "\xc9\xd7\xd3\xf2" /* == "IPL2" in EBCDIC */ 119 #define VOL1_MAGIC "\xe5\xd6\xd3\xf1" /* == "VOL1" in EBCDIC */ 120 #define LNX1_MAGIC "\xd3\xd5\xe7\xf1" /* == "LNX1" in EBCDIC */ 121 #define CMS1_MAGIC "\xc3\xd4\xe2\xf1" /* == "CMS1" in EBCDIC */ 122 123 #define LDL1_VERSION '\x40' /* == ' ' in EBCDIC */ 124 #define LDL2_VERSION '\xf2' /* == '2' in EBCDIC */ 125 126 #define ZIPL_COMP_HEADER_IPL 0x00 127 #define ZIPL_COMP_HEADER_DUMP 0x01 128 129 #define ZIPL_COMP_ENTRY_EXEC 0x01 130 #define ZIPL_COMP_ENTRY_LOAD 0x02 131 #define ZIPL_COMP_ENTRY_SIGNATURE 0x03 132 133 typedef struct XEckdMbr { 134 uint8_t magic[4]; /* == "xIPL" */ 135 uint8_t version; 136 uint8_t bp_type; 137 uint8_t dev_type; /* == DEV_TYPE_* */ 138 #define DEV_TYPE_ECKD 0x00 139 #define DEV_TYPE_FBA 0x01 140 uint8_t flags; 141 BootMapPointer blockptr; 142 uint8_t reserved[8]; 143 } __attribute__ ((packed)) XEckdMbr; /* see also BootInfo */ 144 145 typedef struct BootMapScriptEntry { 146 BootMapPointer blkptr; 147 uint8_t pad[7]; 148 uint8_t type; /* == BOOT_SCRIPT_* */ 149 #define BOOT_SCRIPT_EXEC 0x01 150 #define BOOT_SCRIPT_LOAD 0x02 151 #define BOOT_SCRIPT_SIGNATURE 0x03 152 union { 153 uint64_t load_address; 154 uint64_t load_psw; 155 } address; 156 } __attribute__ ((packed)) BootMapScriptEntry; 157 158 typedef struct BootMapScriptHeader { 159 uint32_t magic; 160 uint8_t type; 161 #define BOOT_SCRIPT_HDR_IPL 0x00 162 uint8_t reserved[27]; 163 } __attribute__ ((packed)) BootMapScriptHeader; 164 165 typedef struct BootMapScript { 166 BootMapScriptHeader header; 167 BootMapScriptEntry entry[]; 168 } __attribute__ ((packed)) BootMapScript; 169 170 /* 171 * These aren't real VTOCs, but referred to this way in some docs. 172 * They are "volume labels" actually. 173 * 174 * Some structures looks similar to described above, but left 175 * separate as there is no indication that they are the same. 176 * So, the value definitions are left separate too. 177 */ 178 typedef struct LDL_VTOC { /* @ rec.3 cyl.0 trk.0 for ECKD */ 179 char magic[4]; /* "LNX1", EBCDIC */ 180 char volser[6]; /* volser, EBCDIC */ 181 uint8_t reserved[69]; /* reserved, 0x40 */ 182 uint8_t LDL_version; /* 0x40 or 0xF2 */ 183 uint64_t formatted_blocks; /* if LDL_version >= 0xF2 */ 184 } __attribute__ ((packed)) LDL_VTOC; 185 186 typedef struct format_date { 187 uint8_t YY; 188 uint8_t MM; 189 uint8_t DD; 190 uint8_t hh; 191 uint8_t mm; 192 uint8_t ss; 193 } __attribute__ ((packed)) format_date_t; 194 195 typedef struct CMS_VTOC { /* @ rec.3 cyl.0 trk.0 for ECKD */ 196 /* @ blk.1 (zero based) for FBA */ 197 char magic[4]; /* 'CMS1', EBCDIC */ 198 char volser[6]; /* volser, EBCDIC */ 199 uint16_t version; /* = 0 */ 200 uint32_t block_size; /* = 512, 1024, 2048, or 4096 */ 201 uint32_t disk_origin; /* = 4 or 5 */ 202 uint32_t blocks; /* Number of usable cyls/blocks */ 203 uint32_t formatted; /* Max number of fmtd cyls/blks */ 204 uint32_t CMS_blocks; /* disk size in CMS blocks */ 205 uint32_t CMS_used; /* Number of CMS blocks in use */ 206 uint32_t FST_size; /* = 64, bytes */ 207 uint32_t FST_per_CMS_blk; /* */ 208 format_date_t format_date; /* YYMMDDhhmmss as 6 bytes */ 209 uint8_t reserved1[2]; /* = 0 */ 210 uint32_t offset; /* disk offset when reserved */ 211 uint32_t next_hole; /* block nr */ 212 uint32_t HBLK_hole_offset; /* >> HBLK data of next hole */ 213 uint32_t alloc_map_usr_off; /* >> user part of Alloc map */ 214 uint8_t reserved2[4]; /* = 0 */ 215 char shared_seg_name[8]; /* */ 216 } __attribute__ ((packed)) CMS_VTOC; 217 218 /* from zipl/include/boot.h */ 219 typedef struct BootInfoBpIpl { 220 union { 221 ExtEckdBlockPtr eckd; 222 ScsiBlockPtr linr; 223 } bm_ptr; 224 uint8_t unused[16]; 225 } __attribute__ ((packed)) BootInfoBpIpl; 226 227 typedef struct EckdDumpParam { 228 uint32_t start_blk; 229 uint32_t end_blk; 230 uint16_t blocksize; 231 uint8_t num_heads; 232 uint8_t bpt; 233 char reserved[4]; 234 } __attribute((packed, may_alias)) EckdDumpParam; 235 236 typedef struct FbaDumpParam { 237 uint64_t start_blk; 238 uint64_t blockct; 239 } __attribute((packed)) FbaDumpParam; 240 241 typedef struct BootInfoBpDump { 242 union { 243 EckdDumpParam eckd; 244 FbaDumpParam fba; 245 } param; 246 uint8_t unused[16]; 247 } __attribute__ ((packed)) BootInfoBpDump; 248 249 typedef struct BootInfo { /* @ 0x70, record #0 */ 250 unsigned char magic[4]; /* = 'zIPL', ASCII */ 251 uint8_t version; /* = 1 */ 252 #define BOOT_INFO_VERSION 1 253 uint8_t bp_type; /* = 0 */ 254 #define BOOT_INFO_BP_TYPE_IPL 0x00 255 #define BOOT_INFO_BP_TYPE_DUMP 0x01 256 uint8_t dev_type; /* = 0 */ 257 #define BOOT_INFO_DEV_TYPE_ECKD 0x00 258 #define BOOT_INFO_DEV_TYPE_FBA 0x01 259 uint8_t flags; /* = 1 */ 260 #ifdef __s390x__ 261 #define BOOT_INFO_FLAGS_ARCH 0x01 262 #else 263 #define BOOT_INFO_FLAGS_ARCH 0x00 264 #endif 265 union { 266 BootInfoBpDump dump; 267 BootInfoBpIpl ipl; 268 } bp; 269 } __attribute__ ((packed)) BootInfo; /* see also XEckdMbr */ 270 271 /* 272 * Structs for IPL 273 */ 274 #define STAGE2_BLK_CNT_MAX 24 /* Stage 1b can load up to 24 blocks */ 275 276 typedef struct EckdCdlIpl1 { 277 uint8_t key[4]; /* == "IPL1" */ 278 uint8_t data[24]; 279 } __attribute__((packed)) EckdCdlIpl1; 280 281 typedef struct EckdSeekArg { 282 uint16_t pad; 283 EckdCHS chs; 284 uint8_t pad2; 285 } __attribute__ ((packed)) EckdSeekArg; 286 287 typedef struct EckdStage1b { 288 uint8_t reserved[32 * STAGE2_BLK_CNT_MAX]; 289 struct EckdSeekArg seek[STAGE2_BLK_CNT_MAX]; 290 uint8_t unused[64]; 291 } __attribute__ ((packed)) EckdStage1b; 292 293 typedef struct EckdStage1 { 294 uint8_t reserved[72]; 295 struct EckdSeekArg seek[2]; 296 } __attribute__ ((packed)) EckdStage1; 297 298 typedef struct EckdCdlIpl2 { 299 uint8_t key[4]; /* == "IPL2" */ 300 struct EckdStage1 stage1; 301 XEckdMbr mbr; 302 uint8_t reserved[24]; 303 } __attribute__((packed)) EckdCdlIpl2; 304 305 typedef struct EckdLdlIpl1 { 306 uint8_t reserved[24]; 307 struct EckdStage1 stage1; 308 BootInfo bip; /* BootInfo is MBR for LDL */ 309 } __attribute__((packed)) EckdLdlIpl1; 310 311 typedef struct IplVolumeLabel { 312 unsigned char key[4]; /* == "VOL1" */ 313 union { 314 unsigned char data[80]; 315 struct { 316 unsigned char key[4]; /* == "VOL1" */ 317 unsigned char volser[6]; 318 unsigned char reserved[64]; 319 EckdCHS br; /* Location of Boot Record for list-directed IPL */ 320 } f; 321 }; 322 } __attribute__((packed)) IplVolumeLabel; 323 324 typedef enum { 325 ECKD_NO_IPL, 326 ECKD_CMS, 327 ECKD_LDL, 328 ECKD_LDL_UNLABELED, 329 } ECKD_IPL_mode_t; 330 331 /* utility code below */ 332 333 static inline void print_volser(const void *volser) 334 { 335 char ascii[8]; 336 337 ebcdic_to_ascii((char *)volser, ascii, 6); 338 ascii[6] = '\0'; 339 sclp_print("VOLSER=["); 340 sclp_print(ascii); 341 sclp_print("]\n"); 342 } 343 344 static inline bool unused_space(const void *p, size_t size) 345 { 346 size_t i; 347 const unsigned char *m = p; 348 349 for (i = 0; i < size; i++) { 350 if (m[i] != FREE_SPACE_FILLER) { 351 return false; 352 } 353 } 354 return true; 355 } 356 357 static inline bool is_null_block_number(block_number_t x) 358 { 359 return x == NULL_BLOCK_NR; 360 } 361 362 static inline void read_block(block_number_t blockno, 363 void *buffer, 364 const char *errmsg) 365 { 366 IPL_assert(virtio_read(blockno, buffer) == 0, errmsg); 367 } 368 369 static inline bool block_size_ok(uint32_t block_size) 370 { 371 return block_size == virtio_get_block_size(); 372 } 373 374 static inline bool magic_match(const void *data, const void *magic) 375 { 376 return *((uint32_t *)data) == *((uint32_t *)magic); 377 } 378 379 static inline uint32_t iso_733_to_u32(uint64_t x) 380 { 381 return (uint32_t)x; 382 } 383 384 #define ISO_SECTOR_SIZE 2048 385 /* El Torito specifies boot image size in 512 byte blocks */ 386 #define ET_SECTOR_SHIFT 2 387 388 #define ISO_PRIMARY_VD_SECTOR 16 389 390 static inline void read_iso_sector(uint32_t block_offset, void *buf, 391 const char *errmsg) 392 { 393 IPL_assert(virtio_read_many(block_offset, buf, 1) == 0, errmsg); 394 } 395 396 static inline void read_iso_boot_image(uint32_t block_offset, void *load_addr, 397 uint32_t blks_to_load) 398 { 399 IPL_assert(virtio_read_many(block_offset, load_addr, blks_to_load) == 0, 400 "Failed to read boot image!"); 401 } 402 403 #define ISO9660_MAX_DIR_DEPTH 8 404 405 typedef struct IsoDirHdr { 406 uint8_t dr_len; 407 uint8_t ear_len; 408 uint64_t ext_loc; 409 uint64_t data_len; 410 uint8_t recording_datetime[7]; 411 uint8_t file_flags; 412 uint8_t file_unit_size; 413 uint8_t gap_size; 414 uint32_t vol_seqnum; 415 uint8_t fileid_len; 416 } __attribute__((packed)) IsoDirHdr; 417 418 typedef struct IsoVdElTorito { 419 uint8_t el_torito[32]; /* must contain el_torito_magic value */ 420 uint8_t unused0[32]; 421 uint32_t bc_offset; 422 uint8_t unused1[1974]; 423 } __attribute__((packed)) IsoVdElTorito; 424 425 typedef struct IsoVdPrimary { 426 uint8_t unused1; 427 uint8_t sys_id[32]; 428 uint8_t vol_id[32]; 429 uint8_t unused2[8]; 430 uint64_t vol_space_size; 431 uint8_t unused3[32]; 432 uint32_t vol_set_size; 433 uint32_t vol_seqnum; 434 uint32_t log_block_size; 435 uint64_t path_table_size; 436 uint32_t l_path_table; 437 uint32_t opt_l_path_table; 438 uint32_t m_path_table; 439 uint32_t opt_m_path_table; 440 IsoDirHdr rootdir; 441 uint8_t root_null; 442 uint8_t reserved2[1858]; 443 } __attribute__((packed)) IsoVdPrimary; 444 445 typedef struct IsoVolDesc { 446 uint8_t type; 447 uint8_t ident[5]; 448 uint8_t version; 449 union { 450 IsoVdElTorito boot; 451 IsoVdPrimary primary; 452 } vd; 453 } __attribute__((packed)) IsoVolDesc; 454 455 #define VOL_DESC_TYPE_BOOT 0 456 #define VOL_DESC_TYPE_PRIMARY 1 457 #define VOL_DESC_TYPE_SUPPLEMENT 2 458 #define VOL_DESC_TYPE_PARTITION 3 459 #define VOL_DESC_TERMINATOR 255 460 461 typedef struct IsoBcValid { 462 uint8_t platform_id; 463 uint16_t reserved; 464 uint8_t id[24]; 465 uint16_t checksum; 466 uint8_t key[2]; 467 } __attribute__((packed)) IsoBcValid; 468 469 typedef struct IsoBcSection { 470 uint8_t boot_type; 471 uint16_t load_segment; 472 uint8_t sys_type; 473 uint8_t unused; 474 uint16_t sector_count; 475 uint32_t load_rba; 476 uint8_t selection[20]; 477 } __attribute__((packed)) IsoBcSection; 478 479 typedef struct IsoBcHdr { 480 uint8_t platform_id; 481 uint16_t sect_num; 482 uint8_t id[28]; 483 } __attribute__((packed)) IsoBcHdr; 484 485 typedef struct IsoBcEntry { 486 uint8_t id; 487 union { 488 IsoBcValid valid; /* id == 0x01 */ 489 IsoBcSection sect; /* id == 0x88 || id == 0x0 */ 490 IsoBcHdr hdr; /* id == 0x90 || id == 0x91 */ 491 } body; 492 } __attribute__((packed)) IsoBcEntry; 493 494 #define ISO_BC_ENTRY_PER_SECTOR (ISO_SECTOR_SIZE / sizeof(IsoBcEntry)) 495 #define ISO_BC_HDR_VALIDATION 0x01 496 #define ISO_BC_BOOTABLE_SECTION 0x88 497 #define ISO_BC_MAGIC_55 0x55 498 #define ISO_BC_MAGIC_AA 0xaa 499 #define ISO_BC_PLATFORM_X86 0x0 500 #define ISO_BC_PLATFORM_PPC 0x1 501 #define ISO_BC_PLATFORM_MAC 0x2 502 503 static inline bool is_iso_bc_valid(IsoBcEntry *e) 504 { 505 IsoBcValid *v = &e->body.valid; 506 507 if (e->id != ISO_BC_HDR_VALIDATION) { 508 return false; 509 } 510 511 if (v->platform_id != ISO_BC_PLATFORM_X86 && 512 v->platform_id != ISO_BC_PLATFORM_PPC && 513 v->platform_id != ISO_BC_PLATFORM_MAC) { 514 return false; 515 } 516 517 return v->key[0] == ISO_BC_MAGIC_55 && 518 v->key[1] == ISO_BC_MAGIC_AA && 519 v->reserved == 0x0; 520 } 521 522 #endif /* _PC_BIOS_S390_CCW_BOOTMAP_H */ 523