pc-bios/s390-ccw/bootmap.h

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