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 "trace.h"
  34 #include "qapi/visitor.h"
  35 #include "migration/vmstate.h"
  36 #include "exec/exec-all.h"
  37 #ifndef CONFIG_USER_ONLY
  38 #include "hw/hw.h"
  39 #include "sysemu/arch_init.h"
  40 #include "sysemu/sysemu.h"
  41 #include "hw/s390x/sclp.h"
  42 #endif
  43
  44 #define CR0_RESET       0xE0UL
  45 #define CR14_RESET      0xC2000000UL;
  46
  47 /* generate CPU information for cpu -? */
  48 void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  49 {
  50 #ifdef CONFIG_KVM
  51     (*cpu_fprintf)(f, "s390 %16s\n", "host");
  52 #endif
  53 }
  54
  55 #ifndef CONFIG_USER_ONLY
  56 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
  57 {
  58     CpuDefinitionInfoList *entry;
  59     CpuDefinitionInfo *info;
  60
  61     info = g_malloc0(sizeof(*info));
  62     info->name = g_strdup("host");
  63
  64     entry = g_malloc0(sizeof(*entry));
  65     entry->value = info;
  66
  67     return entry;
  68 }
  69 #endif
  70
  71 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  72 {
  73     S390CPU *cpu = S390_CPU(cs);
  74
  75     cpu->env.psw.addr = value;
  76 }
  77
  78 static bool s390_cpu_has_work(CPUState *cs)
  79 {
  80     S390CPU *cpu = S390_CPU(cs);
  81     CPUS390XState *env = &cpu->env;
  82
  83     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  84            (env->psw.mask & PSW_MASK_EXT);
  85 }
  86
  87 #if !defined(CONFIG_USER_ONLY)
  88 /* S390CPUClass::load_normal() */
  89 static void s390_cpu_load_normal(CPUState *s)
  90 {
  91     S390CPU *cpu = S390_CPU(s);
  92     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  93     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  94     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  95 }
  96 #endif
  97
  98 /* S390CPUClass::cpu_reset() */
  99 static void s390_cpu_reset(CPUState *s)
 100 {
 101     S390CPU *cpu = S390_CPU(s);
 102     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 103     CPUS390XState *env = &cpu->env;
 104
 105     env->pfault_token = -1UL;
 106     scc->parent_reset(s);
 107     cpu->env.sigp_order = 0;
 108     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 109     tlb_flush(s, 1);
 110 }
 111
 112 /* S390CPUClass::initial_reset() */
 113 static void s390_cpu_initial_reset(CPUState *s)
 114 {
 115     S390CPU *cpu = S390_CPU(s);
 116     CPUS390XState *env = &cpu->env;
 117     int i;
 118
 119     s390_cpu_reset(s);
 120     /* initial reset does not touch regs,fregs and aregs */
 121     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
 122                          offsetof(CPUS390XState, fpc));
 123
 124     /* architectured initial values for CR 0 and 14 */
 125     env->cregs[0] = CR0_RESET;
 126     env->cregs[14] = CR14_RESET;
 127
 128     /* architectured initial value for Breaking-Event-Address register */
 129     env->gbea = 1;
 130
 131     env->pfault_token = -1UL;
 132     env->ext_index = -1;
 133     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 134         env->io_index[i] = -1;
 135     }
 136
 137     /* tininess for underflow is detected before rounding */
 138     set_float_detect_tininess(float_tininess_before_rounding,
 139                               &env->fpu_status);
 140
 141     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 142     if (kvm_enabled()) {
 143         kvm_s390_reset_vcpu(cpu);
 144     }
 145     tlb_flush(s, 1);
 146 }
 147
 148 /* CPUClass:reset() */
 149 static void s390_cpu_full_reset(CPUState *s)
 150 {
 151     S390CPU *cpu = S390_CPU(s);
 152     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 153     CPUS390XState *env = &cpu->env;
 154     int i;
 155
 156     scc->parent_reset(s);
 157     cpu->env.sigp_order = 0;
 158     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 159
 160     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 161
 162     /* architectured initial values for CR 0 and 14 */
 163     env->cregs[0] = CR0_RESET;
 164     env->cregs[14] = CR14_RESET;
 165
 166     /* architectured initial value for Breaking-Event-Address register */
 167     env->gbea = 1;
 168
 169     env->pfault_token = -1UL;
 170     env->ext_index = -1;
 171     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 172         env->io_index[i] = -1;
 173     }
 174
 175     /* tininess for underflow is detected before rounding */
 176     set_float_detect_tininess(float_tininess_before_rounding,
 177                               &env->fpu_status);
 178
 179     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 180     if (kvm_enabled()) {
 181         kvm_s390_reset_vcpu(cpu);
 182     }
 183     tlb_flush(s, 1);
 184 }
 185
 186 #if !defined(CONFIG_USER_ONLY)
 187 static void s390_cpu_machine_reset_cb(void *opaque)
 188 {
 189     S390CPU *cpu = opaque;
 190
 191     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 192 }
 193 #endif
 194
 195 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 196 {
 197     info->mach = bfd_mach_s390_64;
 198     info->print_insn = print_insn_s390;
 199 }
 200
 201 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 202 {
 203     CPUState *cs = CPU(dev);
 204     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 205     S390CPU *cpu = S390_CPU(dev);
 206     CPUS390XState *env = &cpu->env;
 207     Error *err = NULL;
 208
 209 #if !defined(CONFIG_USER_ONLY)
 210     if (cpu->id >= max_cpus) {
 211         error_setg(&err, "Unable to add CPU: %" PRIi64
 212                    ", max allowed: %d", cpu->id, max_cpus - 1);
 213         goto out;
 214     }
 215 #endif
 216     if (cpu_exists(cpu->id)) {
 217         error_setg(&err, "Unable to add CPU: %" PRIi64
 218                    ", it already exists", cpu->id);
 219         goto out;
 220     }
 221     if (cpu->id != scc->next_cpu_id) {
 222         error_setg(&err, "Unable to add CPU: %" PRIi64
 223                    ", The next available id is %" PRIi64, cpu->id,
 224                    scc->next_cpu_id);
 225         goto out;
 226     }
 227
 228     cpu_exec_init(cs, &err);
 229     if (err != NULL) {
 230         goto out;
 231     }
 232     scc->next_cpu_id++;
 233
 234 #if !defined(CONFIG_USER_ONLY)
 235     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 236 #endif
 237     env->cpu_num = cpu->id;
 238     s390_cpu_gdb_init(cs);
 239     qemu_init_vcpu(cs);
 240 #if !defined(CONFIG_USER_ONLY)
 241     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 242 #else
 243     cpu_reset(cs);
 244 #endif
 245
 246     scc->parent_realize(dev, &err);
 247
 248 #if !defined(CONFIG_USER_ONLY)
 249     if (dev->hotplugged) {
 250         raise_irq_cpu_hotplug();
 251     }
 252 #endif
 253
 254 out:
 255     error_propagate(errp, err);
 256 }
 257
 258 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 259                              void *opaque, Error **errp)
 260 {
 261     S390CPU *cpu = S390_CPU(obj);
 262     int64_t value = cpu->id;
 263
 264     visit_type_int(v, name, &value, errp);
 265 }
 266
 267 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 268                              void *opaque, Error **errp)
 269 {
 270     S390CPU *cpu = S390_CPU(obj);
 271     DeviceState *dev = DEVICE(obj);
 272     const int64_t min = 0;
 273     const int64_t max = UINT32_MAX;
 274     Error *err = NULL;
 275     int64_t value;
 276
 277     if (dev->realized) {
 278         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 279                    "it was realized", name, object_get_typename(obj));
 280         return;
 281     }
 282
 283     visit_type_int(v, name, &value, &err);
 284     if (err) {
 285         error_propagate(errp, err);
 286         return;
 287     }
 288     if (value < min || value > max) {
 289         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 290                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 291                    object_get_typename(obj), name, value, min, max);
 292         return;
 293     }
 294     cpu->id = value;
 295 }
 296
 297 static void s390_cpu_initfn(Object *obj)
 298 {
 299     CPUState *cs = CPU(obj);
 300     S390CPU *cpu = S390_CPU(obj);
 301     CPUS390XState *env = &cpu->env;
 302     static bool inited;
 303 #if !defined(CONFIG_USER_ONLY)
 304     struct tm tm;
 305 #endif
 306
 307     cs->env_ptr = env;
 308     cs->halted = 1;
 309     cs->exception_index = EXCP_HLT;
 310     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 311                         s390x_cpu_set_id, NULL, NULL, NULL);
 312 #if !defined(CONFIG_USER_ONLY)
 313     qemu_get_timedate(&tm, 0);
 314     env->tod_offset = TOD_UNIX_EPOCH +
 315                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 316     env->tod_basetime = 0;
 317     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 318     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 319     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 320 #endif
 321
 322     if (tcg_enabled() && !inited) {
 323         inited = true;
 324         s390x_translate_init();
 325     }
 326 }
 327
 328 static void s390_cpu_finalize(Object *obj)
 329 {
 330 #if !defined(CONFIG_USER_ONLY)
 331     S390CPU *cpu = S390_CPU(obj);
 332
 333     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 334     g_free(cpu->irqstate);
 335 #endif
 336 }
 337
 338 #if !defined(CONFIG_USER_ONLY)
 339 static bool disabled_wait(CPUState *cpu)
 340 {
 341     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 342                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 343 }
 344
 345 static unsigned s390_count_running_cpus(void)
 346 {
 347     CPUState *cpu;
 348     int nr_running = 0;
 349
 350     CPU_FOREACH(cpu) {
 351         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 352         if (state == CPU_STATE_OPERATING ||
 353             state == CPU_STATE_LOAD) {
 354             if (!disabled_wait(cpu)) {
 355                 nr_running++;
 356             }
 357         }
 358     }
 359
 360     return nr_running;
 361 }
 362
 363 unsigned int s390_cpu_halt(S390CPU *cpu)
 364 {
 365     CPUState *cs = CPU(cpu);
 366     trace_cpu_halt(cs->cpu_index);
 367
 368     if (!cs->halted) {
 369         cs->halted = 1;
 370         cs->exception_index = EXCP_HLT;
 371     }
 372
 373     return s390_count_running_cpus();
 374 }
 375
 376 void s390_cpu_unhalt(S390CPU *cpu)
 377 {
 378     CPUState *cs = CPU(cpu);
 379     trace_cpu_unhalt(cs->cpu_index);
 380
 381     if (cs->halted) {
 382         cs->halted = 0;
 383         cs->exception_index = -1;
 384     }
 385 }
 386
 387 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 388  {
 389     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 390
 391     switch (cpu_state) {
 392     case CPU_STATE_STOPPED:
 393     case CPU_STATE_CHECK_STOP:
 394         /* halt the cpu for common infrastructure */
 395         s390_cpu_halt(cpu);
 396         break;
 397     case CPU_STATE_OPERATING:
 398     case CPU_STATE_LOAD:
 399         /* unhalt the cpu for common infrastructure */
 400         s390_cpu_unhalt(cpu);
 401         break;
 402     default:
 403         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 404                      cpu_state);
 405         exit(1);
 406     }
 407     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 408         kvm_s390_set_cpu_state(cpu, cpu_state);
 409     }
 410     cpu->env.cpu_state = cpu_state;
 411
 412     return s390_count_running_cpus();
 413 }
 414 #endif
 415
 416 static gchar *s390_gdb_arch_name(CPUState *cs)
 417 {
 418     return g_strdup("s390:64-bit");
 419 }
 420
 421 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 422 {
 423     S390CPUClass *scc = S390_CPU_CLASS(oc);
 424     CPUClass *cc = CPU_CLASS(scc);
 425     DeviceClass *dc = DEVICE_CLASS(oc);
 426
 427     scc->next_cpu_id = 0;
 428     scc->parent_realize = dc->realize;
 429     dc->realize = s390_cpu_realizefn;
 430
 431     scc->parent_reset = cc->reset;
 432 #if !defined(CONFIG_USER_ONLY)
 433     scc->load_normal = s390_cpu_load_normal;
 434 #endif
 435     scc->cpu_reset = s390_cpu_reset;
 436     scc->initial_cpu_reset = s390_cpu_initial_reset;
 437     cc->reset = s390_cpu_full_reset;
 438     cc->has_work = s390_cpu_has_work;
 439     cc->do_interrupt = s390_cpu_do_interrupt;
 440     cc->dump_state = s390_cpu_dump_state;
 441     cc->set_pc = s390_cpu_set_pc;
 442     cc->gdb_read_register = s390_cpu_gdb_read_register;
 443     cc->gdb_write_register = s390_cpu_gdb_write_register;
 444 #ifdef CONFIG_USER_ONLY
 445     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 446 #else
 447     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 448     cc->vmsd = &vmstate_s390_cpu;
 449     cc->write_elf64_note = s390_cpu_write_elf64_note;
 450     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 451     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 452 #endif
 453     cc->disas_set_info = s390_cpu_disas_set_info;
 454
 455     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 456     cc->gdb_core_xml_file = "s390x-core64.xml";
 457     cc->gdb_arch_name = s390_gdb_arch_name;
 458
 459     /*
 460      * Reason: s390_cpu_realizefn() calls cpu_exec_init(), which saves
 461      * the object in cpus -> dangling pointer after final
 462      * object_unref().
 463      */
 464     dc->cannot_destroy_with_object_finalize_yet = true;
 465 }
 466
 467 static const TypeInfo s390_cpu_type_info = {
 468     .name = TYPE_S390_CPU,
 469     .parent = TYPE_CPU,
 470     .instance_size = sizeof(S390CPU),
 471     .instance_init = s390_cpu_initfn,
 472     .instance_finalize = s390_cpu_finalize,
 473     .abstract = false,
 474     .class_size = sizeof(S390CPUClass),
 475     .class_init = s390_cpu_class_init,
 476 };
 477
 478 static void s390_cpu_register_types(void)
 479 {
 480     type_register_static(&s390_cpu_type_info);
 481 }
 482
 483 type_init(s390_cpu_register_types)