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 "qapi/error.h"
  28 #include "cpu.h"
  29 #include "qemu-common.h"
  30 #include "qemu/cutils.h"
  31 #include "qemu/timer.h"
  32 #include "qemu/error-report.h"
  33 #include "hw/hw.h"
  34 #include "trace.h"
  35 #include "qapi/visitor.h"
  36 #ifndef CONFIG_USER_ONLY
  37 #include "sysemu/arch_init.h"
  38 #include "sysemu/sysemu.h"
  39 #include "hw/s390x/sclp.h"
  40 #endif
  41
  42 #define CR0_RESET       0xE0UL
  43 #define CR14_RESET      0xC2000000UL;
  44
  45 /* generate CPU information for cpu -? */
  46 void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  47 {
  48 #ifdef CONFIG_KVM
  49     (*cpu_fprintf)(f, "s390 %16s\n", "host");
  50 #endif
  51 }
  52
  53 #ifndef CONFIG_USER_ONLY
  54 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
  55 {
  56     CpuDefinitionInfoList *entry;
  57     CpuDefinitionInfo *info;
  58
  59     info = g_malloc0(sizeof(*info));
  60     info->name = g_strdup("host");
  61
  62     entry = g_malloc0(sizeof(*entry));
  63     entry->value = info;
  64
  65     return entry;
  66 }
  67 #endif
  68
  69 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  70 {
  71     S390CPU *cpu = S390_CPU(cs);
  72
  73     cpu->env.psw.addr = value;
  74 }
  75
  76 static bool s390_cpu_has_work(CPUState *cs)
  77 {
  78     S390CPU *cpu = S390_CPU(cs);
  79     CPUS390XState *env = &cpu->env;
  80
  81     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  82            (env->psw.mask & PSW_MASK_EXT);
  83 }
  84
  85 #if !defined(CONFIG_USER_ONLY)
  86 /* S390CPUClass::load_normal() */
  87 static void s390_cpu_load_normal(CPUState *s)
  88 {
  89     S390CPU *cpu = S390_CPU(s);
  90     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  91     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  92     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  93 }
  94 #endif
  95
  96 /* S390CPUClass::cpu_reset() */
  97 static void s390_cpu_reset(CPUState *s)
  98 {
  99     S390CPU *cpu = S390_CPU(s);
 100     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 101     CPUS390XState *env = &cpu->env;
 102
 103     env->pfault_token = -1UL;
 104     scc->parent_reset(s);
 105     cpu->env.sigp_order = 0;
 106     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 107     tlb_flush(s, 1);
 108 }
 109
 110 /* S390CPUClass::initial_reset() */
 111 static void s390_cpu_initial_reset(CPUState *s)
 112 {
 113     S390CPU *cpu = S390_CPU(s);
 114     CPUS390XState *env = &cpu->env;
 115     int i;
 116
 117     s390_cpu_reset(s);
 118     /* initial reset does not touch regs,fregs and aregs */
 119     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
 120                          offsetof(CPUS390XState, fpc));
 121
 122     /* architectured initial values for CR 0 and 14 */
 123     env->cregs[0] = CR0_RESET;
 124     env->cregs[14] = CR14_RESET;
 125
 126     /* architectured initial value for Breaking-Event-Address register */
 127     env->gbea = 1;
 128
 129     env->pfault_token = -1UL;
 130     env->ext_index = -1;
 131     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 132         env->io_index[i] = -1;
 133     }
 134
 135     /* tininess for underflow is detected before rounding */
 136     set_float_detect_tininess(float_tininess_before_rounding,
 137                               &env->fpu_status);
 138
 139     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 140     if (kvm_enabled()) {
 141         kvm_s390_reset_vcpu(cpu);
 142     }
 143     tlb_flush(s, 1);
 144 }
 145
 146 /* CPUClass:reset() */
 147 static void s390_cpu_full_reset(CPUState *s)
 148 {
 149     S390CPU *cpu = S390_CPU(s);
 150     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 151     CPUS390XState *env = &cpu->env;
 152     int i;
 153
 154     scc->parent_reset(s);
 155     cpu->env.sigp_order = 0;
 156     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 157
 158     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 159
 160     /* architectured initial values for CR 0 and 14 */
 161     env->cregs[0] = CR0_RESET;
 162     env->cregs[14] = CR14_RESET;
 163
 164     /* architectured initial value for Breaking-Event-Address register */
 165     env->gbea = 1;
 166
 167     env->pfault_token = -1UL;
 168     env->ext_index = -1;
 169     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 170         env->io_index[i] = -1;
 171     }
 172
 173     /* tininess for underflow is detected before rounding */
 174     set_float_detect_tininess(float_tininess_before_rounding,
 175                               &env->fpu_status);
 176
 177     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 178     if (kvm_enabled()) {
 179         kvm_s390_reset_vcpu(cpu);
 180     }
 181     tlb_flush(s, 1);
 182 }
 183
 184 #if !defined(CONFIG_USER_ONLY)
 185 static void s390_cpu_machine_reset_cb(void *opaque)
 186 {
 187     S390CPU *cpu = opaque;
 188
 189     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 190 }
 191 #endif
 192
 193 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 194 {
 195     info->mach = bfd_mach_s390_64;
 196     info->print_insn = print_insn_s390;
 197 }
 198
 199 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 200 {
 201     CPUState *cs = CPU(dev);
 202     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 203     S390CPU *cpu = S390_CPU(dev);
 204     CPUS390XState *env = &cpu->env;
 205     Error *err = NULL;
 206
 207 #if !defined(CONFIG_USER_ONLY)
 208     if (cpu->id >= max_cpus) {
 209         error_setg(&err, "Unable to add CPU: %" PRIi64
 210                    ", max allowed: %d", cpu->id, max_cpus - 1);
 211         goto out;
 212     }
 213 #endif
 214     if (cpu_exists(cpu->id)) {
 215         error_setg(&err, "Unable to add CPU: %" PRIi64
 216                    ", it already exists", cpu->id);
 217         goto out;
 218     }
 219     if (cpu->id != scc->next_cpu_id) {
 220         error_setg(&err, "Unable to add CPU: %" PRIi64
 221                    ", The next available id is %" PRIi64, cpu->id,
 222                    scc->next_cpu_id);
 223         goto out;
 224     }
 225
 226     cpu_exec_init(cs, &err);
 227     if (err != NULL) {
 228         goto out;
 229     }
 230     scc->next_cpu_id++;
 231
 232 #if !defined(CONFIG_USER_ONLY)
 233     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 234 #endif
 235     env->cpu_num = cpu->id;
 236     s390_cpu_gdb_init(cs);
 237     qemu_init_vcpu(cs);
 238 #if !defined(CONFIG_USER_ONLY)
 239     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 240 #else
 241     cpu_reset(cs);
 242 #endif
 243
 244     scc->parent_realize(dev, &err);
 245
 246 #if !defined(CONFIG_USER_ONLY)
 247     if (dev->hotplugged) {
 248         raise_irq_cpu_hotplug();
 249     }
 250 #endif
 251
 252 out:
 253     error_propagate(errp, err);
 254 }
 255
 256 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 257                              void *opaque, Error **errp)
 258 {
 259     S390CPU *cpu = S390_CPU(obj);
 260     int64_t value = cpu->id;
 261
 262     visit_type_int(v, name, &value, errp);
 263 }
 264
 265 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 266                              void *opaque, Error **errp)
 267 {
 268     S390CPU *cpu = S390_CPU(obj);
 269     DeviceState *dev = DEVICE(obj);
 270     const int64_t min = 0;
 271     const int64_t max = UINT32_MAX;
 272     Error *err = NULL;
 273     int64_t value;
 274
 275     if (dev->realized) {
 276         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 277                    "it was realized", name, object_get_typename(obj));
 278         return;
 279     }
 280
 281     visit_type_int(v, name, &value, &err);
 282     if (err) {
 283         error_propagate(errp, err);
 284         return;
 285     }
 286     if (value < min || value > max) {
 287         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 288                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 289                    object_get_typename(obj), name, value, min, max);
 290         return;
 291     }
 292     cpu->id = value;
 293 }
 294
 295 static void s390_cpu_initfn(Object *obj)
 296 {
 297     CPUState *cs = CPU(obj);
 298     S390CPU *cpu = S390_CPU(obj);
 299     CPUS390XState *env = &cpu->env;
 300     static bool inited;
 301 #if !defined(CONFIG_USER_ONLY)
 302     struct tm tm;
 303 #endif
 304
 305     cs->env_ptr = env;
 306     cs->halted = 1;
 307     cs->exception_index = EXCP_HLT;
 308     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 309                         s390x_cpu_set_id, NULL, NULL, NULL);
 310 #if !defined(CONFIG_USER_ONLY)
 311     qemu_get_timedate(&tm, 0);
 312     env->tod_offset = TOD_UNIX_EPOCH +
 313                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 314     env->tod_basetime = 0;
 315     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 316     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 317     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 318 #endif
 319
 320     if (tcg_enabled() && !inited) {
 321         inited = true;
 322         s390x_translate_init();
 323     }
 324 }
 325
 326 static void s390_cpu_finalize(Object *obj)
 327 {
 328 #if !defined(CONFIG_USER_ONLY)
 329     S390CPU *cpu = S390_CPU(obj);
 330
 331     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 332     g_free(cpu->irqstate);
 333 #endif
 334 }
 335
 336 #if !defined(CONFIG_USER_ONLY)
 337 static bool disabled_wait(CPUState *cpu)
 338 {
 339     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 340                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 341 }
 342
 343 static unsigned s390_count_running_cpus(void)
 344 {
 345     CPUState *cpu;
 346     int nr_running = 0;
 347
 348     CPU_FOREACH(cpu) {
 349         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 350         if (state == CPU_STATE_OPERATING ||
 351             state == CPU_STATE_LOAD) {
 352             if (!disabled_wait(cpu)) {
 353                 nr_running++;
 354             }
 355         }
 356     }
 357
 358     return nr_running;
 359 }
 360
 361 unsigned int s390_cpu_halt(S390CPU *cpu)
 362 {
 363     CPUState *cs = CPU(cpu);
 364     trace_cpu_halt(cs->cpu_index);
 365
 366     if (!cs->halted) {
 367         cs->halted = 1;
 368         cs->exception_index = EXCP_HLT;
 369     }
 370
 371     return s390_count_running_cpus();
 372 }
 373
 374 void s390_cpu_unhalt(S390CPU *cpu)
 375 {
 376     CPUState *cs = CPU(cpu);
 377     trace_cpu_unhalt(cs->cpu_index);
 378
 379     if (cs->halted) {
 380         cs->halted = 0;
 381         cs->exception_index = -1;
 382     }
 383 }
 384
 385 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 386  {
 387     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 388
 389     switch (cpu_state) {
 390     case CPU_STATE_STOPPED:
 391     case CPU_STATE_CHECK_STOP:
 392         /* halt the cpu for common infrastructure */
 393         s390_cpu_halt(cpu);
 394         break;
 395     case CPU_STATE_OPERATING:
 396     case CPU_STATE_LOAD:
 397         /* unhalt the cpu for common infrastructure */
 398         s390_cpu_unhalt(cpu);
 399         break;
 400     default:
 401         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 402                      cpu_state);
 403         exit(1);
 404     }
 405     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 406         kvm_s390_set_cpu_state(cpu, cpu_state);
 407     }
 408     cpu->env.cpu_state = cpu_state;
 409
 410     return s390_count_running_cpus();
 411 }
 412 #endif
 413
 414 static gchar *s390_gdb_arch_name(CPUState *cs)
 415 {
 416     return g_strdup("s390:64-bit");
 417 }
 418
 419 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 420 {
 421     S390CPUClass *scc = S390_CPU_CLASS(oc);
 422     CPUClass *cc = CPU_CLASS(scc);
 423     DeviceClass *dc = DEVICE_CLASS(oc);
 424
 425     scc->next_cpu_id = 0;
 426     scc->parent_realize = dc->realize;
 427     dc->realize = s390_cpu_realizefn;
 428
 429     scc->parent_reset = cc->reset;
 430 #if !defined(CONFIG_USER_ONLY)
 431     scc->load_normal = s390_cpu_load_normal;
 432 #endif
 433     scc->cpu_reset = s390_cpu_reset;
 434     scc->initial_cpu_reset = s390_cpu_initial_reset;
 435     cc->reset = s390_cpu_full_reset;
 436     cc->has_work = s390_cpu_has_work;
 437     cc->do_interrupt = s390_cpu_do_interrupt;
 438     cc->dump_state = s390_cpu_dump_state;
 439     cc->set_pc = s390_cpu_set_pc;
 440     cc->gdb_read_register = s390_cpu_gdb_read_register;
 441     cc->gdb_write_register = s390_cpu_gdb_write_register;
 442 #ifdef CONFIG_USER_ONLY
 443     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 444 #else
 445     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 446     cc->vmsd = &vmstate_s390_cpu;
 447     cc->write_elf64_note = s390_cpu_write_elf64_note;
 448     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 449     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 450 #endif
 451     cc->disas_set_info = s390_cpu_disas_set_info;
 452
 453     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 454     cc->gdb_core_xml_file = "s390x-core64.xml";
 455     cc->gdb_arch_name = s390_gdb_arch_name;
 456
 457     /*
 458      * Reason: s390_cpu_realizefn() calls cpu_exec_init(), which saves
 459      * the object in cpus -> dangling pointer after final
 460      * object_unref().
 461      */
 462     dc->cannot_destroy_with_object_finalize_yet = true;
 463 }
 464
 465 static const TypeInfo s390_cpu_type_info = {
 466     .name = TYPE_S390_CPU,
 467     .parent = TYPE_CPU,
 468     .instance_size = sizeof(S390CPU),
 469     .instance_init = s390_cpu_initfn,
 470     .instance_finalize = s390_cpu_finalize,
 471     .abstract = false,
 472     .class_size = sizeof(S390CPUClass),
 473     .class_init = s390_cpu_class_init,
 474 };
 475
 476 static void s390_cpu_register_types(void)
 477 {
 478     type_register_static(&s390_cpu_type_info);
 479 }
 480
 481 type_init(s390_cpu_register_types)