target-s390x/cpu.c

   1 /*
   2  * QEMU S/390 CPU
   3  *
   4  * Copyright (c) 2009 Ulrich Hecht
   5  * Copyright (c) 2011 Alexander Graf
   6  * Copyright (c) 2012 SUSE LINUX Products GmbH
   7  * Copyright (c) 2012 IBM Corp.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, see
  21  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  22  * Contributions after 2012-12-11 are licensed under the terms of the
  23  * GNU GPL, version 2 or (at your option) any later version.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "cpu.h"
  28 #include "qemu-common.h"
  29 #include "qemu/timer.h"
  30 #include "qemu/error-report.h"
  31 #include "hw/hw.h"
  32 #include "trace.h"
  33 #include "qapi/visitor.h"
  34 #ifndef CONFIG_USER_ONLY
  35 #include "sysemu/arch_init.h"
  36 #include "sysemu/sysemu.h"
  37 #include "hw/s390x/sclp.h"
  38 #endif
  39
  40 #define CR0_RESET       0xE0UL
  41 #define CR14_RESET      0xC2000000UL;
  42
  43 /* generate CPU information for cpu -? */
  44 void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  45 {
  46 #ifdef CONFIG_KVM
  47     (*cpu_fprintf)(f, "s390 %16s\n", "host");
  48 #endif
  49 }
  50
  51 #ifndef CONFIG_USER_ONLY
  52 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
  53 {
  54     CpuDefinitionInfoList *entry;
  55     CpuDefinitionInfo *info;
  56
  57     info = g_malloc0(sizeof(*info));
  58     info->name = g_strdup("host");
  59
  60     entry = g_malloc0(sizeof(*entry));
  61     entry->value = info;
  62
  63     return entry;
  64 }
  65 #endif
  66
  67 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  68 {
  69     S390CPU *cpu = S390_CPU(cs);
  70
  71     cpu->env.psw.addr = value;
  72 }
  73
  74 static bool s390_cpu_has_work(CPUState *cs)
  75 {
  76     S390CPU *cpu = S390_CPU(cs);
  77     CPUS390XState *env = &cpu->env;
  78
  79     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  80            (env->psw.mask & PSW_MASK_EXT);
  81 }
  82
  83 #if !defined(CONFIG_USER_ONLY)
  84 /* S390CPUClass::load_normal() */
  85 static void s390_cpu_load_normal(CPUState *s)
  86 {
  87     S390CPU *cpu = S390_CPU(s);
  88     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  89     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  90     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  91 }
  92 #endif
  93
  94 /* S390CPUClass::cpu_reset() */
  95 static void s390_cpu_reset(CPUState *s)
  96 {
  97     S390CPU *cpu = S390_CPU(s);
  98     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  99     CPUS390XState *env = &cpu->env;
 100
 101     env->pfault_token = -1UL;
 102     scc->parent_reset(s);
 103     cpu->env.sigp_order = 0;
 104     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 105     tlb_flush(s, 1);
 106 }
 107
 108 /* S390CPUClass::initial_reset() */
 109 static void s390_cpu_initial_reset(CPUState *s)
 110 {
 111     S390CPU *cpu = S390_CPU(s);
 112     CPUS390XState *env = &cpu->env;
 113     int i;
 114
 115     s390_cpu_reset(s);
 116     /* initial reset does not touch regs,fregs and aregs */
 117     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
 118                          offsetof(CPUS390XState, fpc));
 119
 120     /* architectured initial values for CR 0 and 14 */
 121     env->cregs[0] = CR0_RESET;
 122     env->cregs[14] = CR14_RESET;
 123
 124     /* architectured initial value for Breaking-Event-Address register */
 125     env->gbea = 1;
 126
 127     env->pfault_token = -1UL;
 128     env->ext_index = -1;
 129     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 130         env->io_index[i] = -1;
 131     }
 132
 133     /* tininess for underflow is detected before rounding */
 134     set_float_detect_tininess(float_tininess_before_rounding,
 135                               &env->fpu_status);
 136
 137     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 138     if (kvm_enabled()) {
 139         kvm_s390_reset_vcpu(cpu);
 140     }
 141     tlb_flush(s, 1);
 142 }
 143
 144 /* CPUClass:reset() */
 145 static void s390_cpu_full_reset(CPUState *s)
 146 {
 147     S390CPU *cpu = S390_CPU(s);
 148     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 149     CPUS390XState *env = &cpu->env;
 150     int i;
 151
 152     scc->parent_reset(s);
 153     cpu->env.sigp_order = 0;
 154     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 155
 156     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 157
 158     /* architectured initial values for CR 0 and 14 */
 159     env->cregs[0] = CR0_RESET;
 160     env->cregs[14] = CR14_RESET;
 161
 162     /* architectured initial value for Breaking-Event-Address register */
 163     env->gbea = 1;
 164
 165     env->pfault_token = -1UL;
 166     env->ext_index = -1;
 167     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 168         env->io_index[i] = -1;
 169     }
 170
 171     /* tininess for underflow is detected before rounding */
 172     set_float_detect_tininess(float_tininess_before_rounding,
 173                               &env->fpu_status);
 174
 175     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 176     if (kvm_enabled()) {
 177         kvm_s390_reset_vcpu(cpu);
 178     }
 179     tlb_flush(s, 1);
 180 }
 181
 182 #if !defined(CONFIG_USER_ONLY)
 183 static void s390_cpu_machine_reset_cb(void *opaque)
 184 {
 185     S390CPU *cpu = opaque;
 186
 187     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 188 }
 189 #endif
 190
 191 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 192 {
 193     info->mach = bfd_mach_s390_64;
 194     info->print_insn = print_insn_s390;
 195 }
 196
 197 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 198 {
 199     CPUState *cs = CPU(dev);
 200     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 201     S390CPU *cpu = S390_CPU(dev);
 202     CPUS390XState *env = &cpu->env;
 203     Error *err = NULL;
 204
 205 #if !defined(CONFIG_USER_ONLY)
 206     if (cpu->id >= max_cpus) {
 207         error_setg(&err, "Unable to add CPU: %" PRIi64
 208                    ", max allowed: %d", cpu->id, max_cpus - 1);
 209         goto out;
 210     }
 211 #endif
 212     if (cpu_exists(cpu->id)) {
 213         error_setg(&err, "Unable to add CPU: %" PRIi64
 214                    ", it already exists", cpu->id);
 215         goto out;
 216     }
 217     if (cpu->id != scc->next_cpu_id) {
 218         error_setg(&err, "Unable to add CPU: %" PRIi64
 219                    ", The next available id is %" PRIi64, cpu->id,
 220                    scc->next_cpu_id);
 221         goto out;
 222     }
 223
 224     cpu_exec_init(cs, &err);
 225     if (err != NULL) {
 226         goto out;
 227     }
 228     scc->next_cpu_id++;
 229
 230 #if !defined(CONFIG_USER_ONLY)
 231     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 232 #endif
 233     env->cpu_num = cpu->id;
 234     s390_cpu_gdb_init(cs);
 235     qemu_init_vcpu(cs);
 236 #if !defined(CONFIG_USER_ONLY)
 237     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 238 #else
 239     cpu_reset(cs);
 240 #endif
 241
 242     scc->parent_realize(dev, &err);
 243
 244 #if !defined(CONFIG_USER_ONLY)
 245     if (dev->hotplugged) {
 246         raise_irq_cpu_hotplug();
 247     }
 248 #endif
 249
 250 out:
 251     error_propagate(errp, err);
 252 }
 253
 254 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 255                              void *opaque, Error **errp)
 256 {
 257     S390CPU *cpu = S390_CPU(obj);
 258     int64_t value = cpu->id;
 259
 260     visit_type_int(v, name, &value, errp);
 261 }
 262
 263 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 264                              void *opaque, Error **errp)
 265 {
 266     S390CPU *cpu = S390_CPU(obj);
 267     DeviceState *dev = DEVICE(obj);
 268     const int64_t min = 0;
 269     const int64_t max = UINT32_MAX;
 270     Error *err = NULL;
 271     int64_t value;
 272
 273     if (dev->realized) {
 274         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 275                    "it was realized", name, object_get_typename(obj));
 276         return;
 277     }
 278
 279     visit_type_int(v, name, &value, &err);
 280     if (err) {
 281         error_propagate(errp, err);
 282         return;
 283     }
 284     if (value < min || value > max) {
 285         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 286                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 287                    object_get_typename(obj), name, value, min, max);
 288         return;
 289     }
 290     cpu->id = value;
 291 }
 292
 293 static void s390_cpu_initfn(Object *obj)
 294 {
 295     CPUState *cs = CPU(obj);
 296     S390CPU *cpu = S390_CPU(obj);
 297     CPUS390XState *env = &cpu->env;
 298     static bool inited;
 299 #if !defined(CONFIG_USER_ONLY)
 300     struct tm tm;
 301 #endif
 302
 303     cs->env_ptr = env;
 304     cs->halted = 1;
 305     cs->exception_index = EXCP_HLT;
 306     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 307                         s390x_cpu_set_id, NULL, NULL, NULL);
 308 #if !defined(CONFIG_USER_ONLY)
 309     qemu_get_timedate(&tm, 0);
 310     env->tod_offset = TOD_UNIX_EPOCH +
 311                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 312     env->tod_basetime = 0;
 313     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 314     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 315     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 316 #endif
 317
 318     if (tcg_enabled() && !inited) {
 319         inited = true;
 320         s390x_translate_init();
 321     }
 322 }
 323
 324 static void s390_cpu_finalize(Object *obj)
 325 {
 326 #if !defined(CONFIG_USER_ONLY)
 327     S390CPU *cpu = S390_CPU(obj);
 328
 329     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 330     g_free(cpu->irqstate);
 331 #endif
 332 }
 333
 334 #if !defined(CONFIG_USER_ONLY)
 335 static bool disabled_wait(CPUState *cpu)
 336 {
 337     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 338                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 339 }
 340
 341 static unsigned s390_count_running_cpus(void)
 342 {
 343     CPUState *cpu;
 344     int nr_running = 0;
 345
 346     CPU_FOREACH(cpu) {
 347         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 348         if (state == CPU_STATE_OPERATING ||
 349             state == CPU_STATE_LOAD) {
 350             if (!disabled_wait(cpu)) {
 351                 nr_running++;
 352             }
 353         }
 354     }
 355
 356     return nr_running;
 357 }
 358
 359 unsigned int s390_cpu_halt(S390CPU *cpu)
 360 {
 361     CPUState *cs = CPU(cpu);
 362     trace_cpu_halt(cs->cpu_index);
 363
 364     if (!cs->halted) {
 365         cs->halted = 1;
 366         cs->exception_index = EXCP_HLT;
 367     }
 368
 369     return s390_count_running_cpus();
 370 }
 371
 372 void s390_cpu_unhalt(S390CPU *cpu)
 373 {
 374     CPUState *cs = CPU(cpu);
 375     trace_cpu_unhalt(cs->cpu_index);
 376
 377     if (cs->halted) {
 378         cs->halted = 0;
 379         cs->exception_index = -1;
 380     }
 381 }
 382
 383 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 384  {
 385     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 386
 387     switch (cpu_state) {
 388     case CPU_STATE_STOPPED:
 389     case CPU_STATE_CHECK_STOP:
 390         /* halt the cpu for common infrastructure */
 391         s390_cpu_halt(cpu);
 392         break;
 393     case CPU_STATE_OPERATING:
 394     case CPU_STATE_LOAD:
 395         /* unhalt the cpu for common infrastructure */
 396         s390_cpu_unhalt(cpu);
 397         break;
 398     default:
 399         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 400                      cpu_state);
 401         exit(1);
 402     }
 403     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 404         kvm_s390_set_cpu_state(cpu, cpu_state);
 405     }
 406     cpu->env.cpu_state = cpu_state;
 407
 408     return s390_count_running_cpus();
 409 }
 410 #endif
 411
 412 static gchar *s390_gdb_arch_name(CPUState *cs)
 413 {
 414     return g_strdup("s390:64-bit");
 415 }
 416
 417 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 418 {
 419     S390CPUClass *scc = S390_CPU_CLASS(oc);
 420     CPUClass *cc = CPU_CLASS(scc);
 421     DeviceClass *dc = DEVICE_CLASS(oc);
 422
 423     scc->next_cpu_id = 0;
 424     scc->parent_realize = dc->realize;
 425     dc->realize = s390_cpu_realizefn;
 426
 427     scc->parent_reset = cc->reset;
 428 #if !defined(CONFIG_USER_ONLY)
 429     scc->load_normal = s390_cpu_load_normal;
 430 #endif
 431     scc->cpu_reset = s390_cpu_reset;
 432     scc->initial_cpu_reset = s390_cpu_initial_reset;
 433     cc->reset = s390_cpu_full_reset;
 434     cc->has_work = s390_cpu_has_work;
 435     cc->do_interrupt = s390_cpu_do_interrupt;
 436     cc->dump_state = s390_cpu_dump_state;
 437     cc->set_pc = s390_cpu_set_pc;
 438     cc->gdb_read_register = s390_cpu_gdb_read_register;
 439     cc->gdb_write_register = s390_cpu_gdb_write_register;
 440 #ifdef CONFIG_USER_ONLY
 441     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 442 #else
 443     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 444     cc->vmsd = &vmstate_s390_cpu;
 445     cc->write_elf64_note = s390_cpu_write_elf64_note;
 446     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 447     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 448 #endif
 449     cc->disas_set_info = s390_cpu_disas_set_info;
 450
 451     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 452     cc->gdb_core_xml_file = "s390x-core64.xml";
 453     cc->gdb_arch_name = s390_gdb_arch_name;
 454
 455     /*
 456      * Reason: s390_cpu_realizefn() calls cpu_exec_init(), which saves
 457      * the object in cpus -> dangling pointer after final
 458      * object_unref().
 459      */
 460     dc->cannot_destroy_with_object_finalize_yet = true;
 461 }
 462
 463 static const TypeInfo s390_cpu_type_info = {
 464     .name = TYPE_S390_CPU,
 465     .parent = TYPE_CPU,
 466     .instance_size = sizeof(S390CPU),
 467     .instance_init = s390_cpu_initfn,
 468     .instance_finalize = s390_cpu_finalize,
 469     .abstract = false,
 470     .class_size = sizeof(S390CPUClass),
 471     .class_init = s390_cpu_class_init,
 472 };
 473
 474 static void s390_cpu_register_types(void)
 475 {
 476     type_register_static(&s390_cpu_type_info);
 477 }
 478
 479 type_init(s390_cpu_register_types)