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 #ifndef CONFIG_USER_ONLY
  25 #include "sysemu/sysemu.h"
  26 #endif
  27
  28 //#define DEBUG_S390
  29 //#define DEBUG_S390_PTE
  30 //#define DEBUG_S390_STDOUT
  31
  32 #ifdef DEBUG_S390
  33 #ifdef DEBUG_S390_STDOUT
  34 #define DPRINTF(fmt, ...) \
  35     do { fprintf(stderr, fmt, ## __VA_ARGS__); \
  36          qemu_log(fmt, ##__VA_ARGS__); } while (0)
  37 #else
  38 #define DPRINTF(fmt, ...) \
  39     do { qemu_log(fmt, ## __VA_ARGS__); } while (0)
  40 #endif
  41 #else
  42 #define DPRINTF(fmt, ...) \
  43     do { } while (0)
  44 #endif
  45
  46 #ifdef DEBUG_S390_PTE
  47 #define PTE_DPRINTF DPRINTF
  48 #else
  49 #define PTE_DPRINTF(fmt, ...) \
  50     do { } while (0)
  51 #endif
  52
  53 #ifndef CONFIG_USER_ONLY
  54 void s390x_tod_timer(void *opaque)
  55 {
  56     S390CPU *cpu = opaque;
  57     CPUS390XState *env = &cpu->env;
  58
  59     env->pending_int |= INTERRUPT_TOD;
  60     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
  61 }
  62
  63 void s390x_cpu_timer(void *opaque)
  64 {
  65     S390CPU *cpu = opaque;
  66     CPUS390XState *env = &cpu->env;
  67
  68     env->pending_int |= INTERRUPT_CPUTIMER;
  69     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
  70 }
  71 #endif
  72
  73 S390CPU *cpu_s390x_init(const char *cpu_model)
  74 {
  75     S390CPU *cpu;
  76
  77     cpu = S390_CPU(object_new(TYPE_S390_CPU));
  78
  79     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
  80
  81     return cpu;
  82 }
  83
  84 #if defined(CONFIG_USER_ONLY)
  85
  86 void s390_cpu_do_interrupt(CPUState *cs)
  87 {
  88     S390CPU *cpu = S390_CPU(cs);
  89     CPUS390XState *env = &cpu->env;
  90
  91     env->exception_index = -1;
  92 }
  93
  94 int cpu_s390x_handle_mmu_fault(CPUS390XState *env, target_ulong address,
  95                                int rw, int mmu_idx)
  96 {
  97     env->exception_index = EXCP_PGM;
  98     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     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     env->exception_index = EXCP_PGM;
 112     env->int_pgm_code = code;
 113     env->int_pgm_ilen = ilen;
 114 }
 115
 116 static int trans_bits(CPUS390XState *env, uint64_t mode)
 117 {
 118     int bits = 0;
 119
 120     switch (mode) {
 121     case PSW_ASC_PRIMARY:
 122         bits = 1;
 123         break;
 124     case PSW_ASC_SECONDARY:
 125         bits = 2;
 126         break;
 127     case PSW_ASC_HOME:
 128         bits = 3;
 129         break;
 130     default:
 131         cpu_abort(env, "unknown asc mode\n");
 132         break;
 133     }
 134
 135     return bits;
 136 }
 137
 138 static void trigger_prot_fault(CPUS390XState *env, target_ulong vaddr,
 139                                uint64_t mode)
 140 {
 141     CPUState *cs = ENV_GET_CPU(env);
 142     int ilen = ILEN_LATER_INC;
 143     int bits = trans_bits(env, mode) | 4;
 144
 145     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits);
 146
 147     stq_phys(cs->as,
 148              env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 149     trigger_pgm_exception(env, PGM_PROTECTION, ilen);
 150 }
 151
 152 static void trigger_page_fault(CPUS390XState *env, target_ulong vaddr,
 153                                uint32_t type, uint64_t asc, int rw)
 154 {
 155     CPUState *cs = ENV_GET_CPU(env);
 156     int ilen = ILEN_LATER;
 157     int bits = trans_bits(env, asc);
 158
 159     /* Code accesses have an undefined ilc.  */
 160     if (rw == 2) {
 161         ilen = 2;
 162     }
 163
 164     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits);
 165
 166     stq_phys(cs->as,
 167              env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 168     trigger_pgm_exception(env, type, ilen);
 169 }
 170
 171 static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
 172                               uint64_t asc, uint64_t asce, int level,
 173                               target_ulong *raddr, int *flags, int rw)
 174 {
 175     CPUState *cs = ENV_GET_CPU(env);
 176     uint64_t offs = 0;
 177     uint64_t origin;
 178     uint64_t new_asce;
 179
 180     PTE_DPRINTF("%s: 0x%" PRIx64 "\n", __func__, asce);
 181
 182     if (((level != _ASCE_TYPE_SEGMENT) && (asce & _REGION_ENTRY_INV)) ||
 183         ((level == _ASCE_TYPE_SEGMENT) && (asce & _SEGMENT_ENTRY_INV))) {
 184         /* XXX different regions have different faults */
 185         DPRINTF("%s: invalid region\n", __func__);
 186         trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw);
 187         return -1;
 188     }
 189
 190     if ((level <= _ASCE_TYPE_MASK) && ((asce & _ASCE_TYPE_MASK) != level)) {
 191         trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 192         return -1;
 193     }
 194
 195     if (asce & _ASCE_REAL_SPACE) {
 196         /* direct mapping */
 197
 198         *raddr = vaddr;
 199         return 0;
 200     }
 201
 202     origin = asce & _ASCE_ORIGIN;
 203
 204     switch (level) {
 205     case _ASCE_TYPE_REGION1 + 4:
 206         offs = (vaddr >> 50) & 0x3ff8;
 207         break;
 208     case _ASCE_TYPE_REGION1:
 209         offs = (vaddr >> 39) & 0x3ff8;
 210         break;
 211     case _ASCE_TYPE_REGION2:
 212         offs = (vaddr >> 28) & 0x3ff8;
 213         break;
 214     case _ASCE_TYPE_REGION3:
 215         offs = (vaddr >> 17) & 0x3ff8;
 216         break;
 217     case _ASCE_TYPE_SEGMENT:
 218         offs = (vaddr >> 9) & 0x07f8;
 219         origin = asce & _SEGMENT_ENTRY_ORIGIN;
 220         break;
 221     }
 222
 223     /* XXX region protection flags */
 224     /* *flags &= ~PAGE_WRITE */
 225
 226     new_asce = ldq_phys(cs->as, origin + offs);
 227     PTE_DPRINTF("%s: 0x%" PRIx64 " + 0x%" PRIx64 " => 0x%016" PRIx64 "\n",
 228                 __func__, origin, offs, new_asce);
 229
 230     if (level != _ASCE_TYPE_SEGMENT) {
 231         /* yet another region */
 232         return mmu_translate_asce(env, vaddr, asc, new_asce, level - 4, raddr,
 233                                   flags, rw);
 234     }
 235
 236     /* PTE */
 237     if (new_asce & _PAGE_INVALID) {
 238         DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, new_asce);
 239         trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw);
 240         return -1;
 241     }
 242
 243     if (new_asce & _PAGE_RO) {
 244         *flags &= ~PAGE_WRITE;
 245     }
 246
 247     *raddr = new_asce & _ASCE_ORIGIN;
 248
 249     PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, new_asce);
 250
 251     return 0;
 252 }
 253
 254 static int mmu_translate_asc(CPUS390XState *env, target_ulong vaddr,
 255                              uint64_t asc, target_ulong *raddr, int *flags,
 256                              int rw)
 257 {
 258     uint64_t asce = 0;
 259     int level, new_level;
 260     int r;
 261
 262     switch (asc) {
 263     case PSW_ASC_PRIMARY:
 264         PTE_DPRINTF("%s: asc=primary\n", __func__);
 265         asce = env->cregs[1];
 266         break;
 267     case PSW_ASC_SECONDARY:
 268         PTE_DPRINTF("%s: asc=secondary\n", __func__);
 269         asce = env->cregs[7];
 270         break;
 271     case PSW_ASC_HOME:
 272         PTE_DPRINTF("%s: asc=home\n", __func__);
 273         asce = env->cregs[13];
 274         break;
 275     }
 276
 277     switch (asce & _ASCE_TYPE_MASK) {
 278     case _ASCE_TYPE_REGION1:
 279         break;
 280     case _ASCE_TYPE_REGION2:
 281         if (vaddr & 0xffe0000000000000ULL) {
 282             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 283                     " 0xffe0000000000000ULL\n", __func__, vaddr);
 284             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 285             return -1;
 286         }
 287         break;
 288     case _ASCE_TYPE_REGION3:
 289         if (vaddr & 0xfffffc0000000000ULL) {
 290             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 291                     " 0xfffffc0000000000ULL\n", __func__, vaddr);
 292             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 293             return -1;
 294         }
 295         break;
 296     case _ASCE_TYPE_SEGMENT:
 297         if (vaddr & 0xffffffff80000000ULL) {
 298             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 299                     " 0xffffffff80000000ULL\n", __func__, vaddr);
 300             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 301             return -1;
 302         }
 303         break;
 304     }
 305
 306     /* fake level above current */
 307     level = asce & _ASCE_TYPE_MASK;
 308     new_level = level + 4;
 309     asce = (asce & ~_ASCE_TYPE_MASK) | (new_level & _ASCE_TYPE_MASK);
 310
 311     r = mmu_translate_asce(env, vaddr, asc, asce, new_level, raddr, flags, rw);
 312
 313     if ((rw == 1) && !(*flags & PAGE_WRITE)) {
 314         trigger_prot_fault(env, vaddr, asc);
 315         return -1;
 316     }
 317
 318     return r;
 319 }
 320
 321 int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc,
 322                   target_ulong *raddr, int *flags)
 323 {
 324     int r = -1;
 325     uint8_t *sk;
 326
 327     *flags = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 328     vaddr &= TARGET_PAGE_MASK;
 329
 330     if (!(env->psw.mask & PSW_MASK_DAT)) {
 331         *raddr = vaddr;
 332         r = 0;
 333         goto out;
 334     }
 335
 336     switch (asc) {
 337     case PSW_ASC_PRIMARY:
 338     case PSW_ASC_HOME:
 339         r = mmu_translate_asc(env, vaddr, asc, raddr, flags, rw);
 340         break;
 341     case PSW_ASC_SECONDARY:
 342         /*
 343          * Instruction: Primary
 344          * Data: Secondary
 345          */
 346         if (rw == 2) {
 347             r = mmu_translate_asc(env, vaddr, PSW_ASC_PRIMARY, raddr, flags,
 348                                   rw);
 349             *flags &= ~(PAGE_READ | PAGE_WRITE);
 350         } else {
 351             r = mmu_translate_asc(env, vaddr, PSW_ASC_SECONDARY, raddr, flags,
 352                                   rw);
 353             *flags &= ~(PAGE_EXEC);
 354         }
 355         break;
 356     case PSW_ASC_ACCREG:
 357     default:
 358         hw_error("guest switched to unknown asc mode\n");
 359         break;
 360     }
 361
 362  out:
 363     /* Convert real address -> absolute address */
 364     if (*raddr < 0x2000) {
 365         *raddr = *raddr + env->psa;
 366     }
 367
 368     if (*raddr <= ram_size) {
 369         sk = &env->storage_keys[*raddr / TARGET_PAGE_SIZE];
 370         if (*flags & PAGE_READ) {
 371             *sk |= SK_R;
 372         }
 373
 374         if (*flags & PAGE_WRITE) {
 375             *sk |= SK_C;
 376         }
 377     }
 378
 379     return r;
 380 }
 381
 382 int cpu_s390x_handle_mmu_fault(CPUS390XState *env, target_ulong orig_vaddr,
 383                                int rw, int mmu_idx)
 384 {
 385     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 386     target_ulong vaddr, raddr;
 387     int prot;
 388
 389     DPRINTF("%s: address 0x%" PRIx64 " rw %d mmu_idx %d\n",
 390             __func__, orig_vaddr, rw, mmu_idx);
 391
 392     orig_vaddr &= TARGET_PAGE_MASK;
 393     vaddr = orig_vaddr;
 394
 395     /* 31-Bit mode */
 396     if (!(env->psw.mask & PSW_MASK_64)) {
 397         vaddr &= 0x7fffffff;
 398     }
 399
 400     if (mmu_translate(env, vaddr, rw, asc, &raddr, &prot)) {
 401         /* Translation ended in exception */
 402         return 1;
 403     }
 404
 405     /* check out of RAM access */
 406     if (raddr > (ram_size + virtio_size)) {
 407         DPRINTF("%s: raddr %" PRIx64 " > ram_size %" PRIx64 "\n", __func__,
 408                 (uint64_t)raddr, (uint64_t)ram_size);
 409         trigger_pgm_exception(env, PGM_ADDRESSING, ILEN_LATER);
 410         return 1;
 411     }
 412
 413     DPRINTF("%s: set tlb %" PRIx64 " -> %" PRIx64 " (%x)\n", __func__,
 414             (uint64_t)vaddr, (uint64_t)raddr, prot);
 415
 416     tlb_set_page(env, orig_vaddr, raddr, prot,
 417                  mmu_idx, TARGET_PAGE_SIZE);
 418
 419     return 0;
 420 }
 421
 422 hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
 423 {
 424     S390CPU *cpu = S390_CPU(cs);
 425     CPUS390XState *env = &cpu->env;
 426     target_ulong raddr;
 427     int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 428     int old_exc = env->exception_index;
 429     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 430
 431     /* 31-Bit mode */
 432     if (!(env->psw.mask & PSW_MASK_64)) {
 433         vaddr &= 0x7fffffff;
 434     }
 435
 436     mmu_translate(env, vaddr, 2, asc, &raddr, &prot);
 437     env->exception_index = old_exc;
 438
 439     return raddr;
 440 }
 441
 442 void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
 443 {
 444     if (mask & PSW_MASK_WAIT) {
 445         S390CPU *cpu = s390_env_get_cpu(env);
 446         CPUState *cs = CPU(cpu);
 447         if (!(mask & (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK))) {
 448             if (s390_del_running_cpu(cpu) == 0) {
 449 #ifndef CONFIG_USER_ONLY
 450                 qemu_system_shutdown_request();
 451 #endif
 452             }
 453         }
 454         cs->halted = 1;
 455         env->exception_index = EXCP_HLT;
 456     }
 457
 458     env->psw.addr = addr;
 459     env->psw.mask = mask;
 460     env->cc_op = (mask >> 44) & 3;
 461 }
 462
 463 static uint64_t get_psw_mask(CPUS390XState *env)
 464 {
 465     uint64_t r;
 466
 467     env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst, env->cc_vr);
 468
 469     r = env->psw.mask;
 470     r &= ~PSW_MASK_CC;
 471     assert(!(env->cc_op & ~3));
 472     r |= (uint64_t)env->cc_op << 44;
 473
 474     return r;
 475 }
 476
 477 static LowCore *cpu_map_lowcore(CPUS390XState *env)
 478 {
 479     LowCore *lowcore;
 480     hwaddr len = sizeof(LowCore);
 481
 482     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 483
 484     if (len < sizeof(LowCore)) {
 485         cpu_abort(env, "Could not map lowcore\n");
 486     }
 487
 488     return lowcore;
 489 }
 490
 491 static void cpu_unmap_lowcore(LowCore *lowcore)
 492 {
 493     cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
 494 }
 495
 496 void *s390_cpu_physical_memory_map(CPUS390XState *env, hwaddr addr, hwaddr *len,
 497                                    int is_write)
 498 {
 499     hwaddr start = addr;
 500
 501     /* Mind the prefix area. */
 502     if (addr < 8192) {
 503         /* Map the lowcore. */
 504         start += env->psa;
 505         *len = MIN(*len, 8192 - addr);
 506     } else if ((addr >= env->psa) && (addr < env->psa + 8192)) {
 507         /* Map the 0 page. */
 508         start -= env->psa;
 509         *len = MIN(*len, 8192 - start);
 510     }
 511
 512     return cpu_physical_memory_map(start, len, is_write);
 513 }
 514
 515 void s390_cpu_physical_memory_unmap(CPUS390XState *env, void *addr, hwaddr len,
 516                                     int is_write)
 517 {
 518     cpu_physical_memory_unmap(addr, len, is_write, len);
 519 }
 520
 521 static void do_svc_interrupt(CPUS390XState *env)
 522 {
 523     uint64_t mask, addr;
 524     LowCore *lowcore;
 525
 526     lowcore = cpu_map_lowcore(env);
 527
 528     lowcore->svc_code = cpu_to_be16(env->int_svc_code);
 529     lowcore->svc_ilen = cpu_to_be16(env->int_svc_ilen);
 530     lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 531     lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + env->int_svc_ilen);
 532     mask = be64_to_cpu(lowcore->svc_new_psw.mask);
 533     addr = be64_to_cpu(lowcore->svc_new_psw.addr);
 534
 535     cpu_unmap_lowcore(lowcore);
 536
 537     load_psw(env, mask, addr);
 538 }
 539
 540 static void do_program_interrupt(CPUS390XState *env)
 541 {
 542     uint64_t mask, addr;
 543     LowCore *lowcore;
 544     int ilen = env->int_pgm_ilen;
 545
 546     switch (ilen) {
 547     case ILEN_LATER:
 548         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 549         break;
 550     case ILEN_LATER_INC:
 551         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 552         env->psw.addr += ilen;
 553         break;
 554     default:
 555         assert(ilen == 2 || ilen == 4 || ilen == 6);
 556     }
 557
 558     qemu_log_mask(CPU_LOG_INT, "%s: code=0x%x ilen=%d\n",
 559                   __func__, env->int_pgm_code, ilen);
 560
 561     lowcore = cpu_map_lowcore(env);
 562
 563     lowcore->pgm_ilen = cpu_to_be16(ilen);
 564     lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
 565     lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 566     lowcore->program_old_psw.addr = cpu_to_be64(env->psw.addr);
 567     mask = be64_to_cpu(lowcore->program_new_psw.mask);
 568     addr = be64_to_cpu(lowcore->program_new_psw.addr);
 569
 570     cpu_unmap_lowcore(lowcore);
 571
 572     DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __func__,
 573             env->int_pgm_code, ilen, env->psw.mask,
 574             env->psw.addr);
 575
 576     load_psw(env, mask, addr);
 577 }
 578
 579 #define VIRTIO_SUBCODE_64 0x0D00
 580
 581 static void do_ext_interrupt(CPUS390XState *env)
 582 {
 583     uint64_t mask, addr;
 584     LowCore *lowcore;
 585     ExtQueue *q;
 586
 587     if (!(env->psw.mask & PSW_MASK_EXT)) {
 588         cpu_abort(env, "Ext int w/o ext mask\n");
 589     }
 590
 591     if (env->ext_index < 0 || env->ext_index > MAX_EXT_QUEUE) {
 592         cpu_abort(env, "Ext queue overrun: %d\n", env->ext_index);
 593     }
 594
 595     q = &env->ext_queue[env->ext_index];
 596     lowcore = cpu_map_lowcore(env);
 597
 598     lowcore->ext_int_code = cpu_to_be16(q->code);
 599     lowcore->ext_params = cpu_to_be32(q->param);
 600     lowcore->ext_params2 = cpu_to_be64(q->param64);
 601     lowcore->external_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 602     lowcore->external_old_psw.addr = cpu_to_be64(env->psw.addr);
 603     lowcore->cpu_addr = cpu_to_be16(env->cpu_num | VIRTIO_SUBCODE_64);
 604     mask = be64_to_cpu(lowcore->external_new_psw.mask);
 605     addr = be64_to_cpu(lowcore->external_new_psw.addr);
 606
 607     cpu_unmap_lowcore(lowcore);
 608
 609     env->ext_index--;
 610     if (env->ext_index == -1) {
 611         env->pending_int &= ~INTERRUPT_EXT;
 612     }
 613
 614     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 615             env->psw.mask, env->psw.addr);
 616
 617     load_psw(env, mask, addr);
 618 }
 619
 620 static void do_io_interrupt(CPUS390XState *env)
 621 {
 622     LowCore *lowcore;
 623     IOIntQueue *q;
 624     uint8_t isc;
 625     int disable = 1;
 626     int found = 0;
 627
 628     if (!(env->psw.mask & PSW_MASK_IO)) {
 629         cpu_abort(env, "I/O int w/o I/O mask\n");
 630     }
 631
 632     for (isc = 0; isc < ARRAY_SIZE(env->io_index); isc++) {
 633         uint64_t isc_bits;
 634
 635         if (env->io_index[isc] < 0) {
 636             continue;
 637         }
 638         if (env->io_index[isc] > MAX_IO_QUEUE) {
 639             cpu_abort(env, "I/O queue overrun for isc %d: %d\n",
 640                       isc, env->io_index[isc]);
 641         }
 642
 643         q = &env->io_queue[env->io_index[isc]][isc];
 644         isc_bits = ISC_TO_ISC_BITS(IO_INT_WORD_ISC(q->word));
 645         if (!(env->cregs[6] & isc_bits)) {
 646             disable = 0;
 647             continue;
 648         }
 649         if (!found) {
 650             uint64_t mask, addr;
 651
 652             found = 1;
 653             lowcore = cpu_map_lowcore(env);
 654
 655             lowcore->subchannel_id = cpu_to_be16(q->id);
 656             lowcore->subchannel_nr = cpu_to_be16(q->nr);
 657             lowcore->io_int_parm = cpu_to_be32(q->parm);
 658             lowcore->io_int_word = cpu_to_be32(q->word);
 659             lowcore->io_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 660             lowcore->io_old_psw.addr = cpu_to_be64(env->psw.addr);
 661             mask = be64_to_cpu(lowcore->io_new_psw.mask);
 662             addr = be64_to_cpu(lowcore->io_new_psw.addr);
 663
 664             cpu_unmap_lowcore(lowcore);
 665
 666             env->io_index[isc]--;
 667
 668             DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 669                     env->psw.mask, env->psw.addr);
 670             load_psw(env, mask, addr);
 671         }
 672         if (env->io_index[isc] >= 0) {
 673             disable = 0;
 674         }
 675         continue;
 676     }
 677
 678     if (disable) {
 679         env->pending_int &= ~INTERRUPT_IO;
 680     }
 681
 682 }
 683
 684 static void do_mchk_interrupt(CPUS390XState *env)
 685 {
 686     uint64_t mask, addr;
 687     LowCore *lowcore;
 688     MchkQueue *q;
 689     int i;
 690
 691     if (!(env->psw.mask & PSW_MASK_MCHECK)) {
 692         cpu_abort(env, "Machine check w/o mchk mask\n");
 693     }
 694
 695     if (env->mchk_index < 0 || env->mchk_index > MAX_MCHK_QUEUE) {
 696         cpu_abort(env, "Mchk queue overrun: %d\n", env->mchk_index);
 697     }
 698
 699     q = &env->mchk_queue[env->mchk_index];
 700
 701     if (q->type != 1) {
 702         /* Don't know how to handle this... */
 703         cpu_abort(env, "Unknown machine check type %d\n", q->type);
 704     }
 705     if (!(env->cregs[14] & (1 << 28))) {
 706         /* CRW machine checks disabled */
 707         return;
 708     }
 709
 710     lowcore = cpu_map_lowcore(env);
 711
 712     for (i = 0; i < 16; i++) {
 713         lowcore->floating_pt_save_area[i] = cpu_to_be64(env->fregs[i].ll);
 714         lowcore->gpregs_save_area[i] = cpu_to_be64(env->regs[i]);
 715         lowcore->access_regs_save_area[i] = cpu_to_be32(env->aregs[i]);
 716         lowcore->cregs_save_area[i] = cpu_to_be64(env->cregs[i]);
 717     }
 718     lowcore->prefixreg_save_area = cpu_to_be32(env->psa);
 719     lowcore->fpt_creg_save_area = cpu_to_be32(env->fpc);
 720     lowcore->tod_progreg_save_area = cpu_to_be32(env->todpr);
 721     lowcore->cpu_timer_save_area[0] = cpu_to_be32(env->cputm >> 32);
 722     lowcore->cpu_timer_save_area[1] = cpu_to_be32((uint32_t)env->cputm);
 723     lowcore->clock_comp_save_area[0] = cpu_to_be32(env->ckc >> 32);
 724     lowcore->clock_comp_save_area[1] = cpu_to_be32((uint32_t)env->ckc);
 725
 726     lowcore->mcck_interruption_code[0] = cpu_to_be32(0x00400f1d);
 727     lowcore->mcck_interruption_code[1] = cpu_to_be32(0x40330000);
 728     lowcore->mcck_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 729     lowcore->mcck_old_psw.addr = cpu_to_be64(env->psw.addr);
 730     mask = be64_to_cpu(lowcore->mcck_new_psw.mask);
 731     addr = be64_to_cpu(lowcore->mcck_new_psw.addr);
 732
 733     cpu_unmap_lowcore(lowcore);
 734
 735     env->mchk_index--;
 736     if (env->mchk_index == -1) {
 737         env->pending_int &= ~INTERRUPT_MCHK;
 738     }
 739
 740     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 741             env->psw.mask, env->psw.addr);
 742
 743     load_psw(env, mask, addr);
 744 }
 745
 746 void s390_cpu_do_interrupt(CPUState *cs)
 747 {
 748     S390CPU *cpu = S390_CPU(cs);
 749     CPUS390XState *env = &cpu->env;
 750
 751     qemu_log_mask(CPU_LOG_INT, "%s: %d at pc=%" PRIx64 "\n",
 752                   __func__, env->exception_index, env->psw.addr);
 753
 754     s390_add_running_cpu(cpu);
 755     /* handle machine checks */
 756     if ((env->psw.mask & PSW_MASK_MCHECK) &&
 757         (env->exception_index == -1)) {
 758         if (env->pending_int & INTERRUPT_MCHK) {
 759             env->exception_index = EXCP_MCHK;
 760         }
 761     }
 762     /* handle external interrupts */
 763     if ((env->psw.mask & PSW_MASK_EXT) &&
 764         env->exception_index == -1) {
 765         if (env->pending_int & INTERRUPT_EXT) {
 766             /* code is already in env */
 767             env->exception_index = EXCP_EXT;
 768         } else if (env->pending_int & INTERRUPT_TOD) {
 769             cpu_inject_ext(cpu, 0x1004, 0, 0);
 770             env->exception_index = EXCP_EXT;
 771             env->pending_int &= ~INTERRUPT_EXT;
 772             env->pending_int &= ~INTERRUPT_TOD;
 773         } else if (env->pending_int & INTERRUPT_CPUTIMER) {
 774             cpu_inject_ext(cpu, 0x1005, 0, 0);
 775             env->exception_index = EXCP_EXT;
 776             env->pending_int &= ~INTERRUPT_EXT;
 777             env->pending_int &= ~INTERRUPT_TOD;
 778         }
 779     }
 780     /* handle I/O interrupts */
 781     if ((env->psw.mask & PSW_MASK_IO) &&
 782         (env->exception_index == -1)) {
 783         if (env->pending_int & INTERRUPT_IO) {
 784             env->exception_index = EXCP_IO;
 785         }
 786     }
 787
 788     switch (env->exception_index) {
 789     case EXCP_PGM:
 790         do_program_interrupt(env);
 791         break;
 792     case EXCP_SVC:
 793         do_svc_interrupt(env);
 794         break;
 795     case EXCP_EXT:
 796         do_ext_interrupt(env);
 797         break;
 798     case EXCP_IO:
 799         do_io_interrupt(env);
 800         break;
 801     case EXCP_MCHK:
 802         do_mchk_interrupt(env);
 803         break;
 804     }
 805     env->exception_index = -1;
 806
 807     if (!env->pending_int) {
 808         cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
 809     }
 810 }
 811
 812 #endif /* CONFIG_USER_ONLY */