target-s390x/helper.c

   1 /*
   2  *  S/390 helpers
   3  *
   4  *  Copyright (c) 2009 Ulrich Hecht
   5  *  Copyright (c) 2011 Alexander Graf
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "cpu.h"
  22 #include "exec/gdbstub.h"
  23 #include "qemu/timer.h"
  24 #include "exec/cpu_ldst.h"
  25 #ifndef CONFIG_USER_ONLY
  26 #include "sysemu/sysemu.h"
  27 #endif
  28
  29 //#define DEBUG_S390
  30 //#define DEBUG_S390_PTE
  31 //#define DEBUG_S390_STDOUT
  32
  33 #ifdef DEBUG_S390
  34 #ifdef DEBUG_S390_STDOUT
  35 #define DPRINTF(fmt, ...) \
  36     do { fprintf(stderr, fmt, ## __VA_ARGS__); \
  37          qemu_log(fmt, ##__VA_ARGS__); } while (0)
  38 #else
  39 #define DPRINTF(fmt, ...) \
  40     do { qemu_log(fmt, ## __VA_ARGS__); } while (0)
  41 #endif
  42 #else
  43 #define DPRINTF(fmt, ...) \
  44     do { } while (0)
  45 #endif
  46
  47 #ifdef DEBUG_S390_PTE
  48 #define PTE_DPRINTF DPRINTF
  49 #else
  50 #define PTE_DPRINTF(fmt, ...) \
  51     do { } while (0)
  52 #endif
  53
  54 #ifndef CONFIG_USER_ONLY
  55 void s390x_tod_timer(void *opaque)
  56 {
  57     S390CPU *cpu = opaque;
  58     CPUS390XState *env = &cpu->env;
  59
  60     env->pending_int |= INTERRUPT_TOD;
  61     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
  62 }
  63
  64 void s390x_cpu_timer(void *opaque)
  65 {
  66     S390CPU *cpu = opaque;
  67     CPUS390XState *env = &cpu->env;
  68
  69     env->pending_int |= INTERRUPT_CPUTIMER;
  70     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
  71 }
  72 #endif
  73
  74 S390CPU *cpu_s390x_init(const char *cpu_model)
  75 {
  76     S390CPU *cpu;
  77
  78     cpu = S390_CPU(object_new(TYPE_S390_CPU));
  79
  80     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
  81
  82     return cpu;
  83 }
  84
  85 #if defined(CONFIG_USER_ONLY)
  86
  87 void s390_cpu_do_interrupt(CPUState *cs)
  88 {
  89     cs->exception_index = -1;
  90 }
  91
  92 int s390_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
  93                               int rw, int mmu_idx)
  94 {
  95     S390CPU *cpu = S390_CPU(cs);
  96
  97     cs->exception_index = EXCP_PGM;
  98     cpu->env.int_pgm_code = PGM_ADDRESSING;
  99     /* On real machines this value is dropped into LowMem.  Since this
 100        is userland, simply put this someplace that cpu_loop can find it.  */
 101     cpu->env.__excp_addr = address;
 102     return 1;
 103 }
 104
 105 #else /* !CONFIG_USER_ONLY */
 106
 107 /* Ensure to exit the TB after this call! */
 108 static void trigger_pgm_exception(CPUS390XState *env, uint32_t code,
 109                                   uint32_t ilen)
 110 {
 111     CPUState *cs = CPU(s390_env_get_cpu(env));
 112
 113     cs->exception_index = EXCP_PGM;
 114     env->int_pgm_code = code;
 115     env->int_pgm_ilen = ilen;
 116 }
 117
 118 static int trans_bits(CPUS390XState *env, uint64_t mode)
 119 {
 120     S390CPU *cpu = s390_env_get_cpu(env);
 121     int bits = 0;
 122
 123     switch (mode) {
 124     case PSW_ASC_PRIMARY:
 125         bits = 1;
 126         break;
 127     case PSW_ASC_SECONDARY:
 128         bits = 2;
 129         break;
 130     case PSW_ASC_HOME:
 131         bits = 3;
 132         break;
 133     default:
 134         cpu_abort(CPU(cpu), "unknown asc mode\n");
 135         break;
 136     }
 137
 138     return bits;
 139 }
 140
 141 static void trigger_prot_fault(CPUS390XState *env, target_ulong vaddr,
 142                                uint64_t mode)
 143 {
 144     CPUState *cs = CPU(s390_env_get_cpu(env));
 145     int ilen = ILEN_LATER_INC;
 146     int bits = trans_bits(env, mode) | 4;
 147
 148     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits);
 149
 150     stq_phys(cs->as,
 151              env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 152     trigger_pgm_exception(env, PGM_PROTECTION, ilen);
 153 }
 154
 155 static void trigger_page_fault(CPUS390XState *env, target_ulong vaddr,
 156                                uint32_t type, uint64_t asc, int rw)
 157 {
 158     CPUState *cs = CPU(s390_env_get_cpu(env));
 159     int ilen = ILEN_LATER;
 160     int bits = trans_bits(env, asc);
 161
 162     /* Code accesses have an undefined ilc.  */
 163     if (rw == 2) {
 164         ilen = 2;
 165     }
 166
 167     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits);
 168
 169     stq_phys(cs->as,
 170              env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 171     trigger_pgm_exception(env, type, ilen);
 172 }
 173
 174 /**
 175  * Translate real address to absolute (= physical)
 176  * address by taking care of the prefix mapping.
 177  */
 178 static target_ulong mmu_real2abs(CPUS390XState *env, target_ulong raddr)
 179 {
 180     if (raddr < 0x2000) {
 181         return raddr + env->psa;    /* Map the lowcore. */
 182     } else if (raddr >= env->psa && raddr < env->psa + 0x2000) {
 183         return raddr - env->psa;    /* Map the 0 page. */
 184     }
 185     return raddr;
 186 }
 187
 188 /* Decode page table entry (normal 4KB page) */
 189 static int mmu_translate_pte(CPUS390XState *env, target_ulong vaddr,
 190                              uint64_t asc, uint64_t asce,
 191                              target_ulong *raddr, int *flags, int rw)
 192 {
 193     if (asce & _PAGE_INVALID) {
 194         DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, asce);
 195         trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw);
 196         return -1;
 197     }
 198
 199     if (asce & _PAGE_RO) {
 200         *flags &= ~PAGE_WRITE;
 201     }
 202
 203     *raddr = asce & _ASCE_ORIGIN;
 204
 205     PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, asce);
 206
 207     return 0;
 208 }
 209
 210 /* Decode EDAT1 segment frame absolute address (1MB page) */
 211 static int mmu_translate_sfaa(CPUS390XState *env, target_ulong vaddr,
 212                               uint64_t asc, uint64_t asce, target_ulong *raddr,
 213                               int *flags, int rw)
 214 {
 215     if (asce & _SEGMENT_ENTRY_INV) {
 216         DPRINTF("%s: SEG=0x%" PRIx64 " invalid\n", __func__, asce);
 217         trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw);
 218         return -1;
 219     }
 220
 221     if (asce & _SEGMENT_ENTRY_RO) {
 222         *flags &= ~PAGE_WRITE;
 223     }
 224
 225     *raddr = (asce & 0xfffffffffff00000ULL) | (vaddr & 0xfffff);
 226
 227     PTE_DPRINTF("%s: SEG=0x%" PRIx64 "\n", __func__, asce);
 228
 229     return 0;
 230 }
 231
 232 static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
 233                               uint64_t asc, uint64_t asce, int level,
 234                               target_ulong *raddr, int *flags, int rw)
 235 {
 236     CPUState *cs = CPU(s390_env_get_cpu(env));
 237     uint64_t offs = 0;
 238     uint64_t origin;
 239     uint64_t new_asce;
 240
 241     PTE_DPRINTF("%s: 0x%" PRIx64 "\n", __func__, asce);
 242
 243     if (((level != _ASCE_TYPE_SEGMENT) && (asce & _REGION_ENTRY_INV)) ||
 244         ((level == _ASCE_TYPE_SEGMENT) && (asce & _SEGMENT_ENTRY_INV))) {
 245         /* XXX different regions have different faults */
 246         DPRINTF("%s: invalid region\n", __func__);
 247         trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw);
 248         return -1;
 249     }
 250
 251     if ((level <= _ASCE_TYPE_MASK) && ((asce & _ASCE_TYPE_MASK) != level)) {
 252         trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 253         return -1;
 254     }
 255
 256     if (asce & _ASCE_REAL_SPACE) {
 257         /* direct mapping */
 258
 259         *raddr = vaddr;
 260         return 0;
 261     }
 262
 263     origin = asce & _ASCE_ORIGIN;
 264
 265     switch (level) {
 266     case _ASCE_TYPE_REGION1 + 4:
 267         offs = (vaddr >> 50) & 0x3ff8;
 268         break;
 269     case _ASCE_TYPE_REGION1:
 270         offs = (vaddr >> 39) & 0x3ff8;
 271         break;
 272     case _ASCE_TYPE_REGION2:
 273         offs = (vaddr >> 28) & 0x3ff8;
 274         break;
 275     case _ASCE_TYPE_REGION3:
 276         offs = (vaddr >> 17) & 0x3ff8;
 277         break;
 278     case _ASCE_TYPE_SEGMENT:
 279         offs = (vaddr >> 9) & 0x07f8;
 280         origin = asce & _SEGMENT_ENTRY_ORIGIN;
 281         break;
 282     }
 283
 284     /* XXX region protection flags */
 285     /* *flags &= ~PAGE_WRITE */
 286
 287     new_asce = ldq_phys(cs->as, origin + offs);
 288     PTE_DPRINTF("%s: 0x%" PRIx64 " + 0x%" PRIx64 " => 0x%016" PRIx64 "\n",
 289                 __func__, origin, offs, new_asce);
 290
 291     if (level == _ASCE_TYPE_SEGMENT) {
 292         /* 4KB page */
 293         return mmu_translate_pte(env, vaddr, asc, new_asce, raddr, flags, rw);
 294     } else if (level - 4 == _ASCE_TYPE_SEGMENT &&
 295                (new_asce & _SEGMENT_ENTRY_FC) && (env->cregs[0] & CR0_EDAT)) {
 296         /* 1MB page */
 297         return mmu_translate_sfaa(env, vaddr, asc, new_asce, raddr, flags, rw);
 298     } else {
 299         /* yet another region */
 300         return mmu_translate_asce(env, vaddr, asc, new_asce, level - 4, raddr,
 301                                   flags, rw);
 302     }
 303 }
 304
 305 static int mmu_translate_asc(CPUS390XState *env, target_ulong vaddr,
 306                              uint64_t asc, target_ulong *raddr, int *flags,
 307                              int rw)
 308 {
 309     uint64_t asce = 0;
 310     int level, new_level;
 311     int r;
 312
 313     switch (asc) {
 314     case PSW_ASC_PRIMARY:
 315         PTE_DPRINTF("%s: asc=primary\n", __func__);
 316         asce = env->cregs[1];
 317         break;
 318     case PSW_ASC_SECONDARY:
 319         PTE_DPRINTF("%s: asc=secondary\n", __func__);
 320         asce = env->cregs[7];
 321         break;
 322     case PSW_ASC_HOME:
 323         PTE_DPRINTF("%s: asc=home\n", __func__);
 324         asce = env->cregs[13];
 325         break;
 326     }
 327
 328     switch (asce & _ASCE_TYPE_MASK) {
 329     case _ASCE_TYPE_REGION1:
 330         break;
 331     case _ASCE_TYPE_REGION2:
 332         if (vaddr & 0xffe0000000000000ULL) {
 333             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 334                     " 0xffe0000000000000ULL\n", __func__, vaddr);
 335             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 336             return -1;
 337         }
 338         break;
 339     case _ASCE_TYPE_REGION3:
 340         if (vaddr & 0xfffffc0000000000ULL) {
 341             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 342                     " 0xfffffc0000000000ULL\n", __func__, vaddr);
 343             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 344             return -1;
 345         }
 346         break;
 347     case _ASCE_TYPE_SEGMENT:
 348         if (vaddr & 0xffffffff80000000ULL) {
 349             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 350                     " 0xffffffff80000000ULL\n", __func__, vaddr);
 351             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 352             return -1;
 353         }
 354         break;
 355     }
 356
 357     /* fake level above current */
 358     level = asce & _ASCE_TYPE_MASK;
 359     new_level = level + 4;
 360     asce = (asce & ~_ASCE_TYPE_MASK) | (new_level & _ASCE_TYPE_MASK);
 361
 362     r = mmu_translate_asce(env, vaddr, asc, asce, new_level, raddr, flags, rw);
 363
 364     if ((rw == 1) && !(*flags & PAGE_WRITE)) {
 365         trigger_prot_fault(env, vaddr, asc);
 366         return -1;
 367     }
 368
 369     return r;
 370 }
 371
 372 int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc,
 373                   target_ulong *raddr, int *flags)
 374 {
 375     int r = -1;
 376     uint8_t *sk;
 377
 378     *flags = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 379     vaddr &= TARGET_PAGE_MASK;
 380
 381     if (!(env->psw.mask & PSW_MASK_DAT)) {
 382         *raddr = vaddr;
 383         r = 0;
 384         goto out;
 385     }
 386
 387     switch (asc) {
 388     case PSW_ASC_PRIMARY:
 389     case PSW_ASC_HOME:
 390         r = mmu_translate_asc(env, vaddr, asc, raddr, flags, rw);
 391         break;
 392     case PSW_ASC_SECONDARY:
 393         /*
 394          * Instruction: Primary
 395          * Data: Secondary
 396          */
 397         if (rw == 2) {
 398             r = mmu_translate_asc(env, vaddr, PSW_ASC_PRIMARY, raddr, flags,
 399                                   rw);
 400             *flags &= ~(PAGE_READ | PAGE_WRITE);
 401         } else {
 402             r = mmu_translate_asc(env, vaddr, PSW_ASC_SECONDARY, raddr, flags,
 403                                   rw);
 404             *flags &= ~(PAGE_EXEC);
 405         }
 406         break;
 407     case PSW_ASC_ACCREG:
 408     default:
 409         hw_error("guest switched to unknown asc mode\n");
 410         break;
 411     }
 412
 413  out:
 414     /* Convert real address -> absolute address */
 415     *raddr = mmu_real2abs(env, *raddr);
 416
 417     if (*raddr <= ram_size) {
 418         sk = &env->storage_keys[*raddr / TARGET_PAGE_SIZE];
 419         if (*flags & PAGE_READ) {
 420             *sk |= SK_R;
 421         }
 422
 423         if (*flags & PAGE_WRITE) {
 424             *sk |= SK_C;
 425         }
 426     }
 427
 428     return r;
 429 }
 430
 431 int s390_cpu_handle_mmu_fault(CPUState *cs, vaddr orig_vaddr,
 432                               int rw, int mmu_idx)
 433 {
 434     S390CPU *cpu = S390_CPU(cs);
 435     CPUS390XState *env = &cpu->env;
 436     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 437     target_ulong vaddr, raddr;
 438     int prot;
 439
 440     DPRINTF("%s: address 0x%" VADDR_PRIx " rw %d mmu_idx %d\n",
 441             __func__, orig_vaddr, rw, mmu_idx);
 442
 443     orig_vaddr &= TARGET_PAGE_MASK;
 444     vaddr = orig_vaddr;
 445
 446     /* 31-Bit mode */
 447     if (!(env->psw.mask & PSW_MASK_64)) {
 448         vaddr &= 0x7fffffff;
 449     }
 450
 451     if (mmu_translate(env, vaddr, rw, asc, &raddr, &prot)) {
 452         /* Translation ended in exception */
 453         return 1;
 454     }
 455
 456     /* check out of RAM access */
 457     if (raddr > (ram_size + virtio_size)) {
 458         DPRINTF("%s: raddr %" PRIx64 " > ram_size %" PRIx64 "\n", __func__,
 459                 (uint64_t)raddr, (uint64_t)ram_size);
 460         trigger_pgm_exception(env, PGM_ADDRESSING, ILEN_LATER);
 461         return 1;
 462     }
 463
 464     DPRINTF("%s: set tlb %" PRIx64 " -> %" PRIx64 " (%x)\n", __func__,
 465             (uint64_t)vaddr, (uint64_t)raddr, prot);
 466
 467     tlb_set_page(cs, orig_vaddr, raddr, prot,
 468                  mmu_idx, TARGET_PAGE_SIZE);
 469
 470     return 0;
 471 }
 472
 473 hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
 474 {
 475     S390CPU *cpu = S390_CPU(cs);
 476     CPUS390XState *env = &cpu->env;
 477     target_ulong raddr;
 478     int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 479     int old_exc = cs->exception_index;
 480     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 481
 482     /* 31-Bit mode */
 483     if (!(env->psw.mask & PSW_MASK_64)) {
 484         vaddr &= 0x7fffffff;
 485     }
 486
 487     mmu_translate(env, vaddr, 2, asc, &raddr, &prot);
 488     cs->exception_index = old_exc;
 489
 490     return raddr;
 491 }
 492
 493 hwaddr s390_cpu_get_phys_addr_debug(CPUState *cs, vaddr vaddr)
 494 {
 495     hwaddr phys_addr;
 496     target_ulong page;
 497
 498     page = vaddr & TARGET_PAGE_MASK;
 499     phys_addr = cpu_get_phys_page_debug(cs, page);
 500     phys_addr += (vaddr & ~TARGET_PAGE_MASK);
 501
 502     return phys_addr;
 503 }
 504
 505 void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
 506 {
 507     if (mask & PSW_MASK_WAIT) {
 508         S390CPU *cpu = s390_env_get_cpu(env);
 509         CPUState *cs = CPU(cpu);
 510         if (!(mask & (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK))) {
 511             if (s390_del_running_cpu(cpu) == 0) {
 512 #ifndef CONFIG_USER_ONLY
 513                 qemu_system_shutdown_request();
 514 #endif
 515             }
 516         }
 517         cs->halted = 1;
 518         cs->exception_index = EXCP_HLT;
 519     }
 520
 521     env->psw.addr = addr;
 522     env->psw.mask = mask;
 523     env->cc_op = (mask >> 44) & 3;
 524 }
 525
 526 static uint64_t get_psw_mask(CPUS390XState *env)
 527 {
 528     uint64_t r;
 529
 530     env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst, env->cc_vr);
 531
 532     r = env->psw.mask;
 533     r &= ~PSW_MASK_CC;
 534     assert(!(env->cc_op & ~3));
 535     r |= (uint64_t)env->cc_op << 44;
 536
 537     return r;
 538 }
 539
 540 static LowCore *cpu_map_lowcore(CPUS390XState *env)
 541 {
 542     S390CPU *cpu = s390_env_get_cpu(env);
 543     LowCore *lowcore;
 544     hwaddr len = sizeof(LowCore);
 545
 546     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 547
 548     if (len < sizeof(LowCore)) {
 549         cpu_abort(CPU(cpu), "Could not map lowcore\n");
 550     }
 551
 552     return lowcore;
 553 }
 554
 555 static void cpu_unmap_lowcore(LowCore *lowcore)
 556 {
 557     cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
 558 }
 559
 560 void *s390_cpu_physical_memory_map(CPUS390XState *env, hwaddr addr, hwaddr *len,
 561                                    int is_write)
 562 {
 563     hwaddr start = addr;
 564
 565     /* Mind the prefix area. */
 566     if (addr < 8192) {
 567         /* Map the lowcore. */
 568         start += env->psa;
 569         *len = MIN(*len, 8192 - addr);
 570     } else if ((addr >= env->psa) && (addr < env->psa + 8192)) {
 571         /* Map the 0 page. */
 572         start -= env->psa;
 573         *len = MIN(*len, 8192 - start);
 574     }
 575
 576     return cpu_physical_memory_map(start, len, is_write);
 577 }
 578
 579 void s390_cpu_physical_memory_unmap(CPUS390XState *env, void *addr, hwaddr len,
 580                                     int is_write)
 581 {
 582     cpu_physical_memory_unmap(addr, len, is_write, len);
 583 }
 584
 585 static void do_svc_interrupt(CPUS390XState *env)
 586 {
 587     uint64_t mask, addr;
 588     LowCore *lowcore;
 589
 590     lowcore = cpu_map_lowcore(env);
 591
 592     lowcore->svc_code = cpu_to_be16(env->int_svc_code);
 593     lowcore->svc_ilen = cpu_to_be16(env->int_svc_ilen);
 594     lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 595     lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + env->int_svc_ilen);
 596     mask = be64_to_cpu(lowcore->svc_new_psw.mask);
 597     addr = be64_to_cpu(lowcore->svc_new_psw.addr);
 598
 599     cpu_unmap_lowcore(lowcore);
 600
 601     load_psw(env, mask, addr);
 602 }
 603
 604 static void do_program_interrupt(CPUS390XState *env)
 605 {
 606     uint64_t mask, addr;
 607     LowCore *lowcore;
 608     int ilen = env->int_pgm_ilen;
 609
 610     switch (ilen) {
 611     case ILEN_LATER:
 612         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 613         break;
 614     case ILEN_LATER_INC:
 615         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 616         env->psw.addr += ilen;
 617         break;
 618     default:
 619         assert(ilen == 2 || ilen == 4 || ilen == 6);
 620     }
 621
 622     qemu_log_mask(CPU_LOG_INT, "%s: code=0x%x ilen=%d\n",
 623                   __func__, env->int_pgm_code, ilen);
 624
 625     lowcore = cpu_map_lowcore(env);
 626
 627     lowcore->pgm_ilen = cpu_to_be16(ilen);
 628     lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
 629     lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 630     lowcore->program_old_psw.addr = cpu_to_be64(env->psw.addr);
 631     mask = be64_to_cpu(lowcore->program_new_psw.mask);
 632     addr = be64_to_cpu(lowcore->program_new_psw.addr);
 633
 634     cpu_unmap_lowcore(lowcore);
 635
 636     DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __func__,
 637             env->int_pgm_code, ilen, env->psw.mask,
 638             env->psw.addr);
 639
 640     load_psw(env, mask, addr);
 641 }
 642
 643 #define VIRTIO_SUBCODE_64 0x0D00
 644
 645 static void do_ext_interrupt(CPUS390XState *env)
 646 {
 647     S390CPU *cpu = s390_env_get_cpu(env);
 648     uint64_t mask, addr;
 649     LowCore *lowcore;
 650     ExtQueue *q;
 651
 652     if (!(env->psw.mask & PSW_MASK_EXT)) {
 653         cpu_abort(CPU(cpu), "Ext int w/o ext mask\n");
 654     }
 655
 656     if (env->ext_index < 0 || env->ext_index > MAX_EXT_QUEUE) {
 657         cpu_abort(CPU(cpu), "Ext queue overrun: %d\n", env->ext_index);
 658     }
 659
 660     q = &env->ext_queue[env->ext_index];
 661     lowcore = cpu_map_lowcore(env);
 662
 663     lowcore->ext_int_code = cpu_to_be16(q->code);
 664     lowcore->ext_params = cpu_to_be32(q->param);
 665     lowcore->ext_params2 = cpu_to_be64(q->param64);
 666     lowcore->external_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 667     lowcore->external_old_psw.addr = cpu_to_be64(env->psw.addr);
 668     lowcore->cpu_addr = cpu_to_be16(env->cpu_num | VIRTIO_SUBCODE_64);
 669     mask = be64_to_cpu(lowcore->external_new_psw.mask);
 670     addr = be64_to_cpu(lowcore->external_new_psw.addr);
 671
 672     cpu_unmap_lowcore(lowcore);
 673
 674     env->ext_index--;
 675     if (env->ext_index == -1) {
 676         env->pending_int &= ~INTERRUPT_EXT;
 677     }
 678
 679     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 680             env->psw.mask, env->psw.addr);
 681
 682     load_psw(env, mask, addr);
 683 }
 684
 685 static void do_io_interrupt(CPUS390XState *env)
 686 {
 687     S390CPU *cpu = s390_env_get_cpu(env);
 688     LowCore *lowcore;
 689     IOIntQueue *q;
 690     uint8_t isc;
 691     int disable = 1;
 692     int found = 0;
 693
 694     if (!(env->psw.mask & PSW_MASK_IO)) {
 695         cpu_abort(CPU(cpu), "I/O int w/o I/O mask\n");
 696     }
 697
 698     for (isc = 0; isc < ARRAY_SIZE(env->io_index); isc++) {
 699         uint64_t isc_bits;
 700
 701         if (env->io_index[isc] < 0) {
 702             continue;
 703         }
 704         if (env->io_index[isc] > MAX_IO_QUEUE) {
 705             cpu_abort(CPU(cpu), "I/O queue overrun for isc %d: %d\n",
 706                       isc, env->io_index[isc]);
 707         }
 708
 709         q = &env->io_queue[env->io_index[isc]][isc];
 710         isc_bits = ISC_TO_ISC_BITS(IO_INT_WORD_ISC(q->word));
 711         if (!(env->cregs[6] & isc_bits)) {
 712             disable = 0;
 713             continue;
 714         }
 715         if (!found) {
 716             uint64_t mask, addr;
 717
 718             found = 1;
 719             lowcore = cpu_map_lowcore(env);
 720
 721             lowcore->subchannel_id = cpu_to_be16(q->id);
 722             lowcore->subchannel_nr = cpu_to_be16(q->nr);
 723             lowcore->io_int_parm = cpu_to_be32(q->parm);
 724             lowcore->io_int_word = cpu_to_be32(q->word);
 725             lowcore->io_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 726             lowcore->io_old_psw.addr = cpu_to_be64(env->psw.addr);
 727             mask = be64_to_cpu(lowcore->io_new_psw.mask);
 728             addr = be64_to_cpu(lowcore->io_new_psw.addr);
 729
 730             cpu_unmap_lowcore(lowcore);
 731
 732             env->io_index[isc]--;
 733
 734             DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 735                     env->psw.mask, env->psw.addr);
 736             load_psw(env, mask, addr);
 737         }
 738         if (env->io_index[isc] >= 0) {
 739             disable = 0;
 740         }
 741         continue;
 742     }
 743
 744     if (disable) {
 745         env->pending_int &= ~INTERRUPT_IO;
 746     }
 747
 748 }
 749
 750 static void do_mchk_interrupt(CPUS390XState *env)
 751 {
 752     S390CPU *cpu = s390_env_get_cpu(env);
 753     uint64_t mask, addr;
 754     LowCore *lowcore;
 755     MchkQueue *q;
 756     int i;
 757
 758     if (!(env->psw.mask & PSW_MASK_MCHECK)) {
 759         cpu_abort(CPU(cpu), "Machine check w/o mchk mask\n");
 760     }
 761
 762     if (env->mchk_index < 0 || env->mchk_index > MAX_MCHK_QUEUE) {
 763         cpu_abort(CPU(cpu), "Mchk queue overrun: %d\n", env->mchk_index);
 764     }
 765
 766     q = &env->mchk_queue[env->mchk_index];
 767
 768     if (q->type != 1) {
 769         /* Don't know how to handle this... */
 770         cpu_abort(CPU(cpu), "Unknown machine check type %d\n", q->type);
 771     }
 772     if (!(env->cregs[14] & (1 << 28))) {
 773         /* CRW machine checks disabled */
 774         return;
 775     }
 776
 777     lowcore = cpu_map_lowcore(env);
 778
 779     for (i = 0; i < 16; i++) {
 780         lowcore->floating_pt_save_area[i] = cpu_to_be64(env->fregs[i].ll);
 781         lowcore->gpregs_save_area[i] = cpu_to_be64(env->regs[i]);
 782         lowcore->access_regs_save_area[i] = cpu_to_be32(env->aregs[i]);
 783         lowcore->cregs_save_area[i] = cpu_to_be64(env->cregs[i]);
 784     }
 785     lowcore->prefixreg_save_area = cpu_to_be32(env->psa);
 786     lowcore->fpt_creg_save_area = cpu_to_be32(env->fpc);
 787     lowcore->tod_progreg_save_area = cpu_to_be32(env->todpr);
 788     lowcore->cpu_timer_save_area[0] = cpu_to_be32(env->cputm >> 32);
 789     lowcore->cpu_timer_save_area[1] = cpu_to_be32((uint32_t)env->cputm);
 790     lowcore->clock_comp_save_area[0] = cpu_to_be32(env->ckc >> 32);
 791     lowcore->clock_comp_save_area[1] = cpu_to_be32((uint32_t)env->ckc);
 792
 793     lowcore->mcck_interruption_code[0] = cpu_to_be32(0x00400f1d);
 794     lowcore->mcck_interruption_code[1] = cpu_to_be32(0x40330000);
 795     lowcore->mcck_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 796     lowcore->mcck_old_psw.addr = cpu_to_be64(env->psw.addr);
 797     mask = be64_to_cpu(lowcore->mcck_new_psw.mask);
 798     addr = be64_to_cpu(lowcore->mcck_new_psw.addr);
 799
 800     cpu_unmap_lowcore(lowcore);
 801
 802     env->mchk_index--;
 803     if (env->mchk_index == -1) {
 804         env->pending_int &= ~INTERRUPT_MCHK;
 805     }
 806
 807     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 808             env->psw.mask, env->psw.addr);
 809
 810     load_psw(env, mask, addr);
 811 }
 812
 813 void s390_cpu_do_interrupt(CPUState *cs)
 814 {
 815     S390CPU *cpu = S390_CPU(cs);
 816     CPUS390XState *env = &cpu->env;
 817
 818     qemu_log_mask(CPU_LOG_INT, "%s: %d at pc=%" PRIx64 "\n",
 819                   __func__, cs->exception_index, env->psw.addr);
 820
 821     s390_add_running_cpu(cpu);
 822     /* handle machine checks */
 823     if ((env->psw.mask & PSW_MASK_MCHECK) &&
 824         (cs->exception_index == -1)) {
 825         if (env->pending_int & INTERRUPT_MCHK) {
 826             cs->exception_index = EXCP_MCHK;
 827         }
 828     }
 829     /* handle external interrupts */
 830     if ((env->psw.mask & PSW_MASK_EXT) &&
 831         cs->exception_index == -1) {
 832         if (env->pending_int & INTERRUPT_EXT) {
 833             /* code is already in env */
 834             cs->exception_index = EXCP_EXT;
 835         } else if (env->pending_int & INTERRUPT_TOD) {
 836             cpu_inject_ext(cpu, 0x1004, 0, 0);
 837             cs->exception_index = EXCP_EXT;
 838             env->pending_int &= ~INTERRUPT_EXT;
 839             env->pending_int &= ~INTERRUPT_TOD;
 840         } else if (env->pending_int & INTERRUPT_CPUTIMER) {
 841             cpu_inject_ext(cpu, 0x1005, 0, 0);
 842             cs->exception_index = EXCP_EXT;
 843             env->pending_int &= ~INTERRUPT_EXT;
 844             env->pending_int &= ~INTERRUPT_TOD;
 845         }
 846     }
 847     /* handle I/O interrupts */
 848     if ((env->psw.mask & PSW_MASK_IO) &&
 849         (cs->exception_index == -1)) {
 850         if (env->pending_int & INTERRUPT_IO) {
 851             cs->exception_index = EXCP_IO;
 852         }
 853     }
 854
 855     switch (cs->exception_index) {
 856     case EXCP_PGM:
 857         do_program_interrupt(env);
 858         break;
 859     case EXCP_SVC:
 860         do_svc_interrupt(env);
 861         break;
 862     case EXCP_EXT:
 863         do_ext_interrupt(env);
 864         break;
 865     case EXCP_IO:
 866         do_io_interrupt(env);
 867         break;
 868     case EXCP_MCHK:
 869         do_mchk_interrupt(env);
 870         break;
 871     }
 872     cs->exception_index = -1;
 873
 874     if (!env->pending_int) {
 875         cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
 876     }
 877 }
 878
 879 #endif /* CONFIG_USER_ONLY */