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