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     tlb_flush(s, 1);
  86 }
  87
  88 /* S390CPUClass::initial_reset() */
  89 static void s390_cpu_initial_reset(CPUState *s)
  90 {
  91     S390CPU *cpu = S390_CPU(s);
  92     CPUS390XState *env = &cpu->env;
  93     int i;
  94
  95     s390_cpu_reset(s);
  96     /* initial reset does not touch regs,fregs and aregs */
  97     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
  98                          offsetof(CPUS390XState, fpc));
  99
 100     /* architectured initial values for CR 0 and 14 */
 101     env->cregs[0] = CR0_RESET;
 102     env->cregs[14] = CR14_RESET;
 103
 104     /* architectured initial value for Breaking-Event-Address register */
 105     env->gbea = 1;
 106
 107     env->pfault_token = -1UL;
 108     env->ext_index = -1;
 109     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 110         env->io_index[i] = -1;
 111     }
 112
 113     /* tininess for underflow is detected before rounding */
 114     set_float_detect_tininess(float_tininess_before_rounding,
 115                               &env->fpu_status);
 116
 117     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 118     if (kvm_enabled()) {
 119         kvm_s390_reset_vcpu(cpu);
 120     }
 121     tlb_flush(s, 1);
 122 }
 123
 124 /* CPUClass:reset() */
 125 static void s390_cpu_full_reset(CPUState *s)
 126 {
 127     S390CPU *cpu = S390_CPU(s);
 128     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 129     CPUS390XState *env = &cpu->env;
 130     int i;
 131
 132     scc->parent_reset(s);
 133     cpu->env.sigp_order = 0;
 134     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 135
 136     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 137
 138     /* architectured initial values for CR 0 and 14 */
 139     env->cregs[0] = CR0_RESET;
 140     env->cregs[14] = CR14_RESET;
 141
 142     /* architectured initial value for Breaking-Event-Address register */
 143     env->gbea = 1;
 144
 145     env->pfault_token = -1UL;
 146     env->ext_index = -1;
 147     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 148         env->io_index[i] = -1;
 149     }
 150
 151     /* tininess for underflow is detected before rounding */
 152     set_float_detect_tininess(float_tininess_before_rounding,
 153                               &env->fpu_status);
 154
 155     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 156     if (kvm_enabled()) {
 157         kvm_s390_reset_vcpu(cpu);
 158     }
 159     tlb_flush(s, 1);
 160 }
 161
 162 #if !defined(CONFIG_USER_ONLY)
 163 static void s390_cpu_machine_reset_cb(void *opaque)
 164 {
 165     S390CPU *cpu = opaque;
 166
 167     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 168 }
 169 #endif
 170
 171 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 172 {
 173     info->mach = bfd_mach_s390_64;
 174     info->print_insn = print_insn_s390;
 175 }
 176
 177 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 178 {
 179     CPUState *cs = CPU(dev);
 180     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 181     S390CPU *cpu = S390_CPU(dev);
 182     CPUS390XState *env = &cpu->env;
 183     Error *err = NULL;
 184
 185     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 186     s390_realize_cpu_model(cs, &err);
 187     if (err) {
 188         goto out;
 189     }
 190
 191 #if !defined(CONFIG_USER_ONLY)
 192     if (cpu->id >= max_cpus) {
 193         error_setg(&err, "Unable to add CPU: %" PRIi64
 194                    ", max allowed: %d", cpu->id, max_cpus - 1);
 195         goto out;
 196     }
 197 #endif
 198     if (cpu_exists(cpu->id)) {
 199         error_setg(&err, "Unable to add CPU: %" PRIi64
 200                    ", it already exists", cpu->id);
 201         goto out;
 202     }
 203     if (cpu->id != scc->next_cpu_id) {
 204         error_setg(&err, "Unable to add CPU: %" PRIi64
 205                    ", The next available id is %" PRIi64, cpu->id,
 206                    scc->next_cpu_id);
 207         goto out;
 208     }
 209
 210     cpu_exec_init(cs, &err);
 211     if (err != NULL) {
 212         goto out;
 213     }
 214     scc->next_cpu_id++;
 215
 216 #if !defined(CONFIG_USER_ONLY)
 217     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 218 #endif
 219     env->cpu_num = cpu->id;
 220     s390_cpu_gdb_init(cs);
 221     qemu_init_vcpu(cs);
 222 #if !defined(CONFIG_USER_ONLY)
 223     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 224 #else
 225     cpu_reset(cs);
 226 #endif
 227
 228     scc->parent_realize(dev, &err);
 229
 230 #if !defined(CONFIG_USER_ONLY)
 231     if (dev->hotplugged) {
 232         raise_irq_cpu_hotplug();
 233     }
 234 #endif
 235
 236 out:
 237     error_propagate(errp, err);
 238 }
 239
 240 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 241                              void *opaque, Error **errp)
 242 {
 243     S390CPU *cpu = S390_CPU(obj);
 244     int64_t value = cpu->id;
 245
 246     visit_type_int(v, name, &value, errp);
 247 }
 248
 249 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 250                              void *opaque, Error **errp)
 251 {
 252     S390CPU *cpu = S390_CPU(obj);
 253     DeviceState *dev = DEVICE(obj);
 254     const int64_t min = 0;
 255     const int64_t max = UINT32_MAX;
 256     Error *err = NULL;
 257     int64_t value;
 258
 259     if (dev->realized) {
 260         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 261                    "it was realized", name, object_get_typename(obj));
 262         return;
 263     }
 264
 265     visit_type_int(v, name, &value, &err);
 266     if (err) {
 267         error_propagate(errp, err);
 268         return;
 269     }
 270     if (value < min || value > max) {
 271         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 272                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 273                    object_get_typename(obj), name, value, min, max);
 274         return;
 275     }
 276     cpu->id = value;
 277 }
 278
 279 static void s390_cpu_initfn(Object *obj)
 280 {
 281     CPUState *cs = CPU(obj);
 282     S390CPU *cpu = S390_CPU(obj);
 283     CPUS390XState *env = &cpu->env;
 284     static bool inited;
 285 #if !defined(CONFIG_USER_ONLY)
 286     struct tm tm;
 287 #endif
 288
 289     cs->env_ptr = env;
 290     cs->halted = 1;
 291     cs->exception_index = EXCP_HLT;
 292     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 293                         s390x_cpu_set_id, NULL, NULL, NULL);
 294     s390_cpu_model_register_props(obj);
 295 #if !defined(CONFIG_USER_ONLY)
 296     qemu_get_timedate(&tm, 0);
 297     env->tod_offset = TOD_UNIX_EPOCH +
 298                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 299     env->tod_basetime = 0;
 300     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 301     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 302     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 303 #endif
 304
 305     if (tcg_enabled() && !inited) {
 306         inited = true;
 307         s390x_translate_init();
 308     }
 309 }
 310
 311 static void s390_cpu_finalize(Object *obj)
 312 {
 313 #if !defined(CONFIG_USER_ONLY)
 314     S390CPU *cpu = S390_CPU(obj);
 315
 316     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 317     g_free(cpu->irqstate);
 318 #endif
 319 }
 320
 321 #if !defined(CONFIG_USER_ONLY)
 322 static bool disabled_wait(CPUState *cpu)
 323 {
 324     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 325                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 326 }
 327
 328 static unsigned s390_count_running_cpus(void)
 329 {
 330     CPUState *cpu;
 331     int nr_running = 0;
 332
 333     CPU_FOREACH(cpu) {
 334         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 335         if (state == CPU_STATE_OPERATING ||
 336             state == CPU_STATE_LOAD) {
 337             if (!disabled_wait(cpu)) {
 338                 nr_running++;
 339             }
 340         }
 341     }
 342
 343     return nr_running;
 344 }
 345
 346 unsigned int s390_cpu_halt(S390CPU *cpu)
 347 {
 348     CPUState *cs = CPU(cpu);
 349     trace_cpu_halt(cs->cpu_index);
 350
 351     if (!cs->halted) {
 352         cs->halted = 1;
 353         cs->exception_index = EXCP_HLT;
 354     }
 355
 356     return s390_count_running_cpus();
 357 }
 358
 359 void s390_cpu_unhalt(S390CPU *cpu)
 360 {
 361     CPUState *cs = CPU(cpu);
 362     trace_cpu_unhalt(cs->cpu_index);
 363
 364     if (cs->halted) {
 365         cs->halted = 0;
 366         cs->exception_index = -1;
 367     }
 368 }
 369
 370 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 371  {
 372     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 373
 374     switch (cpu_state) {
 375     case CPU_STATE_STOPPED:
 376     case CPU_STATE_CHECK_STOP:
 377         /* halt the cpu for common infrastructure */
 378         s390_cpu_halt(cpu);
 379         break;
 380     case CPU_STATE_OPERATING:
 381     case CPU_STATE_LOAD:
 382         /* unhalt the cpu for common infrastructure */
 383         s390_cpu_unhalt(cpu);
 384         break;
 385     default:
 386         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 387                      cpu_state);
 388         exit(1);
 389     }
 390     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 391         kvm_s390_set_cpu_state(cpu, cpu_state);
 392     }
 393     cpu->env.cpu_state = cpu_state;
 394
 395     return s390_count_running_cpus();
 396 }
 397 #endif
 398
 399 static gchar *s390_gdb_arch_name(CPUState *cs)
 400 {
 401     return g_strdup("s390:64-bit");
 402 }
 403
 404 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 405 {
 406     S390CPUClass *scc = S390_CPU_CLASS(oc);
 407     CPUClass *cc = CPU_CLASS(scc);
 408     DeviceClass *dc = DEVICE_CLASS(oc);
 409
 410     scc->next_cpu_id = 0;
 411     scc->parent_realize = dc->realize;
 412     dc->realize = s390_cpu_realizefn;
 413
 414     scc->parent_reset = cc->reset;
 415 #if !defined(CONFIG_USER_ONLY)
 416     scc->load_normal = s390_cpu_load_normal;
 417 #endif
 418     scc->cpu_reset = s390_cpu_reset;
 419     scc->initial_cpu_reset = s390_cpu_initial_reset;
 420     cc->reset = s390_cpu_full_reset;
 421     cc->class_by_name = s390_cpu_class_by_name,
 422     cc->has_work = s390_cpu_has_work;
 423     cc->do_interrupt = s390_cpu_do_interrupt;
 424     cc->dump_state = s390_cpu_dump_state;
 425     cc->set_pc = s390_cpu_set_pc;
 426     cc->gdb_read_register = s390_cpu_gdb_read_register;
 427     cc->gdb_write_register = s390_cpu_gdb_write_register;
 428 #ifdef CONFIG_USER_ONLY
 429     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 430 #else
 431     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 432     cc->vmsd = &vmstate_s390_cpu;
 433     cc->write_elf64_note = s390_cpu_write_elf64_note;
 434     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 435     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 436 #endif
 437     cc->disas_set_info = s390_cpu_disas_set_info;
 438
 439     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 440     cc->gdb_core_xml_file = "s390x-core64.xml";
 441     cc->gdb_arch_name = s390_gdb_arch_name;
 442
 443     /*
 444      * Reason: s390_cpu_realizefn() calls cpu_exec_init(), which saves
 445      * the object in cpus -> dangling pointer after final
 446      * object_unref().
 447      */
 448     dc->cannot_destroy_with_object_finalize_yet = true;
 449     s390_cpu_model_class_register_props(oc);
 450 }
 451
 452 static const TypeInfo s390_cpu_type_info = {
 453     .name = TYPE_S390_CPU,
 454     .parent = TYPE_CPU,
 455     .instance_size = sizeof(S390CPU),
 456     .instance_init = s390_cpu_initfn,
 457     .instance_finalize = s390_cpu_finalize,
 458     .abstract = true,
 459     .class_size = sizeof(S390CPUClass),
 460     .class_init = s390_cpu_class_init,
 461 };
 462
 463 static void s390_cpu_register_types(void)
 464 {
 465     type_register_static(&s390_cpu_type_info);
 466 }
 467
 468 type_init(s390_cpu_register_types)