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 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  48 {
  49     S390CPU *cpu = S390_CPU(cs);
  50
  51     cpu->env.psw.addr = value;
  52 }
  53
  54 static bool s390_cpu_has_work(CPUState *cs)
  55 {
  56     S390CPU *cpu = S390_CPU(cs);
  57     CPUS390XState *env = &cpu->env;
  58
  59     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  60            (env->psw.mask & PSW_MASK_EXT);
  61 }
  62
  63 #if !defined(CONFIG_USER_ONLY)
  64 /* S390CPUClass::load_normal() */
  65 static void s390_cpu_load_normal(CPUState *s)
  66 {
  67     S390CPU *cpu = S390_CPU(s);
  68     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  69     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  70     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  71 }
  72 #endif
  73
  74 /* S390CPUClass::cpu_reset() */
  75 static void s390_cpu_reset(CPUState *s)
  76 {
  77     S390CPU *cpu = S390_CPU(s);
  78     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  79     CPUS390XState *env = &cpu->env;
  80
  81     env->pfault_token = -1UL;
  82     scc->parent_reset(s);
  83     cpu->env.sigp_order = 0;
  84     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
  85 }
  86
  87 /* S390CPUClass::initial_reset() */
  88 static void s390_cpu_initial_reset(CPUState *s)
  89 {
  90     S390CPU *cpu = S390_CPU(s);
  91     CPUS390XState *env = &cpu->env;
  92     int i;
  93
  94     s390_cpu_reset(s);
  95     /* initial reset does not touch regs,fregs and aregs */
  96     memset(&env->fpc, 0, offsetof(CPUS390XState, end_reset_fields) -
  97                          offsetof(CPUS390XState, fpc));
  98
  99     /* architectured initial values for CR 0 and 14 */
 100     env->cregs[0] = CR0_RESET;
 101     env->cregs[14] = CR14_RESET;
 102
 103     /* architectured initial value for Breaking-Event-Address register */
 104     env->gbea = 1;
 105
 106     env->pfault_token = -1UL;
 107     env->ext_index = -1;
 108     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 109         env->io_index[i] = -1;
 110     }
 111
 112     /* tininess for underflow is detected before rounding */
 113     set_float_detect_tininess(float_tininess_before_rounding,
 114                               &env->fpu_status);
 115
 116     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 117     if (kvm_enabled()) {
 118         kvm_s390_reset_vcpu(cpu);
 119     }
 120 }
 121
 122 /* CPUClass:reset() */
 123 static void s390_cpu_full_reset(CPUState *s)
 124 {
 125     S390CPU *cpu = S390_CPU(s);
 126     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 127     CPUS390XState *env = &cpu->env;
 128     int i;
 129
 130     scc->parent_reset(s);
 131     cpu->env.sigp_order = 0;
 132     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 133
 134     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 135
 136     /* architectured initial values for CR 0 and 14 */
 137     env->cregs[0] = CR0_RESET;
 138     env->cregs[14] = CR14_RESET;
 139
 140     /* architectured initial value for Breaking-Event-Address register */
 141     env->gbea = 1;
 142
 143     env->pfault_token = -1UL;
 144     env->ext_index = -1;
 145     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 146         env->io_index[i] = -1;
 147     }
 148
 149     /* tininess for underflow is detected before rounding */
 150     set_float_detect_tininess(float_tininess_before_rounding,
 151                               &env->fpu_status);
 152
 153     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 154     if (kvm_enabled()) {
 155         kvm_s390_reset_vcpu(cpu);
 156     }
 157 }
 158
 159 #if !defined(CONFIG_USER_ONLY)
 160 static void s390_cpu_machine_reset_cb(void *opaque)
 161 {
 162     S390CPU *cpu = opaque;
 163
 164     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 165 }
 166 #endif
 167
 168 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 169 {
 170     info->mach = bfd_mach_s390_64;
 171     info->print_insn = print_insn_s390;
 172 }
 173
 174 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 175 {
 176     CPUState *cs = CPU(dev);
 177     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 178     S390CPU *cpu = S390_CPU(dev);
 179     CPUS390XState *env = &cpu->env;
 180     Error *err = NULL;
 181
 182     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 183     s390_realize_cpu_model(cs, &err);
 184     if (err) {
 185         goto out;
 186     }
 187
 188 #if !defined(CONFIG_USER_ONLY)
 189     if (cpu->id >= max_cpus) {
 190         error_setg(&err, "Unable to add CPU: %" PRIi64
 191                    ", max allowed: %d", cpu->id, max_cpus - 1);
 192         goto out;
 193     }
 194 #endif
 195     if (cpu_exists(cpu->id)) {
 196         error_setg(&err, "Unable to add CPU: %" PRIi64
 197                    ", it already exists", cpu->id);
 198         goto out;
 199     }
 200     if (cpu->id != scc->next_cpu_id) {
 201         error_setg(&err, "Unable to add CPU: %" PRIi64
 202                    ", The next available id is %" PRIi64, cpu->id,
 203                    scc->next_cpu_id);
 204         goto out;
 205     }
 206
 207     cpu_exec_realizefn(cs, &err);
 208     if (err != NULL) {
 209         goto out;
 210     }
 211     scc->next_cpu_id++;
 212
 213 #if !defined(CONFIG_USER_ONLY)
 214     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 215 #endif
 216     env->cpu_num = cpu->id;
 217     s390_cpu_gdb_init(cs);
 218     qemu_init_vcpu(cs);
 219 #if !defined(CONFIG_USER_ONLY)
 220     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 221 #else
 222     cpu_reset(cs);
 223 #endif
 224
 225     scc->parent_realize(dev, &err);
 226
 227 #if !defined(CONFIG_USER_ONLY)
 228     if (dev->hotplugged) {
 229         raise_irq_cpu_hotplug();
 230     }
 231 #endif
 232
 233 out:
 234     error_propagate(errp, err);
 235 }
 236
 237 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 238                              void *opaque, Error **errp)
 239 {
 240     S390CPU *cpu = S390_CPU(obj);
 241     int64_t value = cpu->id;
 242
 243     visit_type_int(v, name, &value, errp);
 244 }
 245
 246 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 247                              void *opaque, Error **errp)
 248 {
 249     S390CPU *cpu = S390_CPU(obj);
 250     DeviceState *dev = DEVICE(obj);
 251     const int64_t min = 0;
 252     const int64_t max = UINT32_MAX;
 253     Error *err = NULL;
 254     int64_t value;
 255
 256     if (dev->realized) {
 257         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 258                    "it was realized", name, object_get_typename(obj));
 259         return;
 260     }
 261
 262     visit_type_int(v, name, &value, &err);
 263     if (err) {
 264         error_propagate(errp, err);
 265         return;
 266     }
 267     if (value < min || value > max) {
 268         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 269                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 270                    object_get_typename(obj), name, value, min, max);
 271         return;
 272     }
 273     cpu->id = value;
 274 }
 275
 276 static void s390_cpu_initfn(Object *obj)
 277 {
 278     CPUState *cs = CPU(obj);
 279     S390CPU *cpu = S390_CPU(obj);
 280     CPUS390XState *env = &cpu->env;
 281     static bool inited;
 282 #if !defined(CONFIG_USER_ONLY)
 283     struct tm tm;
 284 #endif
 285
 286     cs->env_ptr = env;
 287     cs->halted = 1;
 288     cs->exception_index = EXCP_HLT;
 289     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 290                         s390x_cpu_set_id, NULL, NULL, NULL);
 291     s390_cpu_model_register_props(obj);
 292 #if !defined(CONFIG_USER_ONLY)
 293     qemu_get_timedate(&tm, 0);
 294     env->tod_offset = TOD_UNIX_EPOCH +
 295                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 296     env->tod_basetime = 0;
 297     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 298     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 299     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 300 #endif
 301
 302     if (tcg_enabled() && !inited) {
 303         inited = true;
 304         s390x_translate_init();
 305     }
 306 }
 307
 308 static void s390_cpu_finalize(Object *obj)
 309 {
 310 #if !defined(CONFIG_USER_ONLY)
 311     S390CPU *cpu = S390_CPU(obj);
 312
 313     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 314     g_free(cpu->irqstate);
 315 #endif
 316 }
 317
 318 #if !defined(CONFIG_USER_ONLY)
 319 static bool disabled_wait(CPUState *cpu)
 320 {
 321     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 322                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 323 }
 324
 325 static unsigned s390_count_running_cpus(void)
 326 {
 327     CPUState *cpu;
 328     int nr_running = 0;
 329
 330     CPU_FOREACH(cpu) {
 331         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 332         if (state == CPU_STATE_OPERATING ||
 333             state == CPU_STATE_LOAD) {
 334             if (!disabled_wait(cpu)) {
 335                 nr_running++;
 336             }
 337         }
 338     }
 339
 340     return nr_running;
 341 }
 342
 343 unsigned int s390_cpu_halt(S390CPU *cpu)
 344 {
 345     CPUState *cs = CPU(cpu);
 346     trace_cpu_halt(cs->cpu_index);
 347
 348     if (!cs->halted) {
 349         cs->halted = 1;
 350         cs->exception_index = EXCP_HLT;
 351     }
 352
 353     return s390_count_running_cpus();
 354 }
 355
 356 void s390_cpu_unhalt(S390CPU *cpu)
 357 {
 358     CPUState *cs = CPU(cpu);
 359     trace_cpu_unhalt(cs->cpu_index);
 360
 361     if (cs->halted) {
 362         cs->halted = 0;
 363         cs->exception_index = -1;
 364     }
 365 }
 366
 367 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 368  {
 369     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 370
 371     switch (cpu_state) {
 372     case CPU_STATE_STOPPED:
 373     case CPU_STATE_CHECK_STOP:
 374         /* halt the cpu for common infrastructure */
 375         s390_cpu_halt(cpu);
 376         break;
 377     case CPU_STATE_OPERATING:
 378     case CPU_STATE_LOAD:
 379         /* unhalt the cpu for common infrastructure */
 380         s390_cpu_unhalt(cpu);
 381         break;
 382     default:
 383         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 384                      cpu_state);
 385         exit(1);
 386     }
 387     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 388         kvm_s390_set_cpu_state(cpu, cpu_state);
 389     }
 390     cpu->env.cpu_state = cpu_state;
 391
 392     return s390_count_running_cpus();
 393 }
 394 #endif
 395
 396 static gchar *s390_gdb_arch_name(CPUState *cs)
 397 {
 398     return g_strdup("s390:64-bit");
 399 }
 400
 401 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 402 {
 403     S390CPUClass *scc = S390_CPU_CLASS(oc);
 404     CPUClass *cc = CPU_CLASS(scc);
 405     DeviceClass *dc = DEVICE_CLASS(oc);
 406
 407     scc->next_cpu_id = 0;
 408     scc->parent_realize = dc->realize;
 409     dc->realize = s390_cpu_realizefn;
 410
 411     scc->parent_reset = cc->reset;
 412 #if !defined(CONFIG_USER_ONLY)
 413     scc->load_normal = s390_cpu_load_normal;
 414 #endif
 415     scc->cpu_reset = s390_cpu_reset;
 416     scc->initial_cpu_reset = s390_cpu_initial_reset;
 417     cc->reset = s390_cpu_full_reset;
 418     cc->class_by_name = s390_cpu_class_by_name,
 419     cc->has_work = s390_cpu_has_work;
 420     cc->do_interrupt = s390_cpu_do_interrupt;
 421     cc->dump_state = s390_cpu_dump_state;
 422     cc->set_pc = s390_cpu_set_pc;
 423     cc->gdb_read_register = s390_cpu_gdb_read_register;
 424     cc->gdb_write_register = s390_cpu_gdb_write_register;
 425 #ifdef CONFIG_USER_ONLY
 426     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 427 #else
 428     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 429     cc->vmsd = &vmstate_s390_cpu;
 430     cc->write_elf64_note = s390_cpu_write_elf64_note;
 431     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 432     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 433 #endif
 434     cc->disas_set_info = s390_cpu_disas_set_info;
 435
 436     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 437     cc->gdb_core_xml_file = "s390x-core64.xml";
 438     cc->gdb_arch_name = s390_gdb_arch_name;
 439
 440     s390_cpu_model_class_register_props(oc);
 441 }
 442
 443 static const TypeInfo s390_cpu_type_info = {
 444     .name = TYPE_S390_CPU,
 445     .parent = TYPE_CPU,
 446     .instance_size = sizeof(S390CPU),
 447     .instance_init = s390_cpu_initfn,
 448     .instance_finalize = s390_cpu_finalize,
 449     .abstract = true,
 450     .class_size = sizeof(S390CPUClass),
 451     .class_init = s390_cpu_class_init,
 452 };
 453
 454 static void s390_cpu_register_types(void)
 455 {
 456     type_register_static(&s390_cpu_type_info);
 457 }
 458
 459 type_init(s390_cpu_register_types)