hw/core/cpu.c

   1 /*
   2  * QEMU CPU model
   3  *
   4  * Copyright (c) 2012-2014 SUSE LINUX Products GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see
  18  * <http://www.gnu.org/licenses/gpl-2.0.html>
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "hw/core/cpu.h"
  24 #include "sysemu/hw_accel.h"
  25 #include "qemu/notify.h"
  26 #include "qemu/log.h"
  27 #include "qemu/main-loop.h"
  28 #include "exec/log.h"
  29 #include "qemu/error-report.h"
  30 #include "qemu/qemu-print.h"
  31 #include "sysemu/tcg.h"
  32 #include "hw/boards.h"
  33 #include "hw/qdev-properties.h"
  34 #include "trace/trace-root.h"
  35 #include "qemu/plugin.h"
  36
  37 CPUInterruptHandler cpu_interrupt_handler;
  38
  39 CPUState *cpu_by_arch_id(int64_t id)
  40 {
  41     CPUState *cpu;
  42
  43     CPU_FOREACH(cpu) {
  44         CPUClass *cc = CPU_GET_CLASS(cpu);
  45
  46         if (cc->get_arch_id(cpu) == id) {
  47             return cpu;
  48         }
  49     }
  50     return NULL;
  51 }
  52
  53 bool cpu_exists(int64_t id)
  54 {
  55     return !!cpu_by_arch_id(id);
  56 }
  57
  58 CPUState *cpu_create(const char *typename)
  59 {
  60     Error *err = NULL;
  61     CPUState *cpu = CPU(object_new(typename));
  62     if (!qdev_realize(DEVICE(cpu), NULL, &err)) {
  63         error_report_err(err);
  64         object_unref(OBJECT(cpu));
  65         exit(EXIT_FAILURE);
  66     }
  67     return cpu;
  68 }
  69
  70 bool cpu_paging_enabled(const CPUState *cpu)
  71 {
  72     CPUClass *cc = CPU_GET_CLASS(cpu);
  73
  74     return cc->get_paging_enabled(cpu);
  75 }
  76
  77 static bool cpu_common_get_paging_enabled(const CPUState *cpu)
  78 {
  79     return false;
  80 }
  81
  82 void cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
  83                             Error **errp)
  84 {
  85     CPUClass *cc = CPU_GET_CLASS(cpu);
  86
  87     cc->get_memory_mapping(cpu, list, errp);
  88 }
  89
  90 static void cpu_common_get_memory_mapping(CPUState *cpu,
  91                                           MemoryMappingList *list,
  92                                           Error **errp)
  93 {
  94     error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
  95 }
  96
  97 /* Resetting the IRQ comes from across the code base so we take the
  98  * BQL here if we need to.  cpu_interrupt assumes it is held.*/
  99 void cpu_reset_interrupt(CPUState *cpu, int mask)
 100 {
 101     bool need_lock = !qemu_mutex_iothread_locked();
 102
 103     if (need_lock) {
 104         qemu_mutex_lock_iothread();
 105     }
 106     cpu->interrupt_request &= ~mask;
 107     if (need_lock) {
 108         qemu_mutex_unlock_iothread();
 109     }
 110 }
 111
 112 void cpu_exit(CPUState *cpu)
 113 {
 114     qatomic_set(&cpu->exit_request, 1);
 115     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
 116     smp_wmb();
 117     qatomic_set(&cpu->icount_decr_ptr->u16.high, -1);
 118 }
 119
 120 int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 121                              void *opaque)
 122 {
 123     CPUClass *cc = CPU_GET_CLASS(cpu);
 124
 125     return (*cc->write_elf32_qemunote)(f, cpu, opaque);
 126 }
 127
 128 static int cpu_common_write_elf32_qemunote(WriteCoreDumpFunction f,
 129                                            CPUState *cpu, void *opaque)
 130 {
 131     return 0;
 132 }
 133
 134 int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
 135                          int cpuid, void *opaque)
 136 {
 137     CPUClass *cc = CPU_GET_CLASS(cpu);
 138
 139     return (*cc->write_elf32_note)(f, cpu, cpuid, opaque);
 140 }
 141
 142 static int cpu_common_write_elf32_note(WriteCoreDumpFunction f,
 143                                        CPUState *cpu, int cpuid,
 144                                        void *opaque)
 145 {
 146     return -1;
 147 }
 148
 149 int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 150                              void *opaque)
 151 {
 152     CPUClass *cc = CPU_GET_CLASS(cpu);
 153
 154     return (*cc->write_elf64_qemunote)(f, cpu, opaque);
 155 }
 156
 157 static int cpu_common_write_elf64_qemunote(WriteCoreDumpFunction f,
 158                                            CPUState *cpu, void *opaque)
 159 {
 160     return 0;
 161 }
 162
 163 int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
 164                          int cpuid, void *opaque)
 165 {
 166     CPUClass *cc = CPU_GET_CLASS(cpu);
 167
 168     return (*cc->write_elf64_note)(f, cpu, cpuid, opaque);
 169 }
 170
 171 static int cpu_common_write_elf64_note(WriteCoreDumpFunction f,
 172                                        CPUState *cpu, int cpuid,
 173                                        void *opaque)
 174 {
 175     return -1;
 176 }
 177
 178
 179 static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
 180 {
 181     return 0;
 182 }
 183
 184 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
 185 {
 186     return 0;
 187 }
 188
 189 static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
 190 {
 191     /* If no extra check is required, QEMU watchpoint match can be considered
 192      * as an architectural match.
 193      */
 194     return true;
 195 }
 196
 197 static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
 198 {
 199     return target_words_bigendian();
 200 }
 201
 202 static void cpu_common_noop(CPUState *cpu)
 203 {
 204 }
 205
 206 static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
 207 {
 208     return false;
 209 }
 210
 211 #if !defined(CONFIG_USER_ONLY)
 212 GuestPanicInformation *cpu_get_crash_info(CPUState *cpu)
 213 {
 214     CPUClass *cc = CPU_GET_CLASS(cpu);
 215     GuestPanicInformation *res = NULL;
 216
 217     if (cc->get_crash_info) {
 218         res = cc->get_crash_info(cpu);
 219     }
 220     return res;
 221 }
 222 #endif
 223
 224 void cpu_dump_state(CPUState *cpu, FILE *f, int flags)
 225 {
 226     CPUClass *cc = CPU_GET_CLASS(cpu);
 227
 228     if (cc->dump_state) {
 229         cpu_synchronize_state(cpu);
 230         cc->dump_state(cpu, f, flags);
 231     }
 232 }
 233
 234 void cpu_dump_statistics(CPUState *cpu, int flags)
 235 {
 236     CPUClass *cc = CPU_GET_CLASS(cpu);
 237
 238     if (cc->dump_statistics) {
 239         cc->dump_statistics(cpu, flags);
 240     }
 241 }
 242
 243 void cpu_reset(CPUState *cpu)
 244 {
 245     device_cold_reset(DEVICE(cpu));
 246
 247     trace_guest_cpu_reset(cpu);
 248 }
 249
 250 static void cpu_common_reset(DeviceState *dev)
 251 {
 252     CPUState *cpu = CPU(dev);
 253     CPUClass *cc = CPU_GET_CLASS(cpu);
 254
 255     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
 256         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
 257         log_cpu_state(cpu, cc->reset_dump_flags);
 258     }
 259
 260     cpu->interrupt_request = 0;
 261     cpu->halted = cpu->start_powered_off;
 262     cpu->mem_io_pc = 0;
 263     cpu->icount_extra = 0;
 264     qatomic_set(&cpu->icount_decr_ptr->u32, 0);
 265     cpu->can_do_io = 1;
 266     cpu->exception_index = -1;
 267     cpu->crash_occurred = false;
 268     cpu->cflags_next_tb = -1;
 269
 270     if (tcg_enabled()) {
 271         cpu_tb_jmp_cache_clear(cpu);
 272
 273         tcg_flush_softmmu_tlb(cpu);
 274     }
 275 }
 276
 277 static bool cpu_common_has_work(CPUState *cs)
 278 {
 279     return false;
 280 }
 281
 282 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 283 {
 284     CPUClass *cc = CPU_CLASS(object_class_by_name(typename));
 285
 286     assert(cpu_model && cc->class_by_name);
 287     return cc->class_by_name(cpu_model);
 288 }
 289
 290 static void cpu_common_parse_features(const char *typename, char *features,
 291                                       Error **errp)
 292 {
 293     char *val;
 294     static bool cpu_globals_initialized;
 295     /* Single "key=value" string being parsed */
 296     char *featurestr = features ? strtok(features, ",") : NULL;
 297
 298     /* should be called only once, catch invalid users */
 299     assert(!cpu_globals_initialized);
 300     cpu_globals_initialized = true;
 301
 302     while (featurestr) {
 303         val = strchr(featurestr, '=');
 304         if (val) {
 305             GlobalProperty *prop = g_new0(typeof(*prop), 1);
 306             *val = 0;
 307             val++;
 308             prop->driver = typename;
 309             prop->property = g_strdup(featurestr);
 310             prop->value = g_strdup(val);
 311             qdev_prop_register_global(prop);
 312         } else {
 313             error_setg(errp, "Expected key=value format, found %s.",
 314                        featurestr);
 315             return;
 316         }
 317         featurestr = strtok(NULL, ",");
 318     }
 319 }
 320
 321 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 322 {
 323     CPUState *cpu = CPU(dev);
 324     Object *machine = qdev_get_machine();
 325
 326     /* qdev_get_machine() can return something that's not TYPE_MACHINE
 327      * if this is one of the user-only emulators; in that case there's
 328      * no need to check the ignore_memory_transaction_failures board flag.
 329      */
 330     if (object_dynamic_cast(machine, TYPE_MACHINE)) {
 331         ObjectClass *oc = object_get_class(machine);
 332         MachineClass *mc = MACHINE_CLASS(oc);
 333
 334         if (mc) {
 335             cpu->ignore_memory_transaction_failures =
 336                 mc->ignore_memory_transaction_failures;
 337         }
 338     }
 339
 340     if (dev->hotplugged) {
 341         cpu_synchronize_post_init(cpu);
 342         cpu_resume(cpu);
 343     }
 344
 345     /* NOTE: latest generic point where the cpu is fully realized */
 346     trace_init_vcpu(cpu);
 347 }
 348
 349 static void cpu_common_unrealizefn(DeviceState *dev)
 350 {
 351     CPUState *cpu = CPU(dev);
 352     /* NOTE: latest generic point before the cpu is fully unrealized */
 353     trace_fini_vcpu(cpu);
 354     qemu_plugin_vcpu_exit_hook(cpu);
 355     cpu_exec_unrealizefn(cpu);
 356 }
 357
 358 static void cpu_common_initfn(Object *obj)
 359 {
 360     CPUState *cpu = CPU(obj);
 361     CPUClass *cc = CPU_GET_CLASS(obj);
 362
 363     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
 364     cpu->cluster_index = UNASSIGNED_CLUSTER_INDEX;
 365     cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
 366     /* *-user doesn't have configurable SMP topology */
 367     /* the default value is changed by qemu_init_vcpu() for softmmu */
 368     cpu->nr_cores = 1;
 369     cpu->nr_threads = 1;
 370
 371     qemu_mutex_init(&cpu->work_mutex);
 372     QSIMPLEQ_INIT(&cpu->work_list);
 373     QTAILQ_INIT(&cpu->breakpoints);
 374     QTAILQ_INIT(&cpu->watchpoints);
 375
 376     cpu_exec_initfn(cpu);
 377 }
 378
 379 static void cpu_common_finalize(Object *obj)
 380 {
 381     CPUState *cpu = CPU(obj);
 382
 383     qemu_mutex_destroy(&cpu->work_mutex);
 384 }
 385
 386 static int64_t cpu_common_get_arch_id(CPUState *cpu)
 387 {
 388     return cpu->cpu_index;
 389 }
 390
 391 static vaddr cpu_adjust_watchpoint_address(CPUState *cpu, vaddr addr, int len)
 392 {
 393     return addr;
 394 }
 395
 396 static void generic_handle_interrupt(CPUState *cpu, int mask)
 397 {
 398     cpu->interrupt_request |= mask;
 399
 400     if (!qemu_cpu_is_self(cpu)) {
 401         qemu_cpu_kick(cpu);
 402     }
 403 }
 404
 405 CPUInterruptHandler cpu_interrupt_handler = generic_handle_interrupt;
 406
 407 static void cpu_class_init(ObjectClass *klass, void *data)
 408 {
 409     DeviceClass *dc = DEVICE_CLASS(klass);
 410     CPUClass *k = CPU_CLASS(klass);
 411
 412     k->parse_features = cpu_common_parse_features;
 413     k->get_arch_id = cpu_common_get_arch_id;
 414     k->has_work = cpu_common_has_work;
 415     k->get_paging_enabled = cpu_common_get_paging_enabled;
 416     k->get_memory_mapping = cpu_common_get_memory_mapping;
 417     k->write_elf32_qemunote = cpu_common_write_elf32_qemunote;
 418     k->write_elf32_note = cpu_common_write_elf32_note;
 419     k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
 420     k->write_elf64_note = cpu_common_write_elf64_note;
 421     k->gdb_read_register = cpu_common_gdb_read_register;
 422     k->gdb_write_register = cpu_common_gdb_write_register;
 423     k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
 424     k->debug_excp_handler = cpu_common_noop;
 425     k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
 426     k->cpu_exec_enter = cpu_common_noop;
 427     k->cpu_exec_exit = cpu_common_noop;
 428     k->cpu_exec_interrupt = cpu_common_exec_interrupt;
 429     k->adjust_watchpoint_address = cpu_adjust_watchpoint_address;
 430     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
 431     dc->realize = cpu_common_realizefn;
 432     dc->unrealize = cpu_common_unrealizefn;
 433     dc->reset = cpu_common_reset;
 434     device_class_set_props(dc, cpu_common_props);
 435     /*
 436      * Reason: CPUs still need special care by board code: wiring up
 437      * IRQs, adding reset handlers, halting non-first CPUs, ...
 438      */
 439     dc->user_creatable = false;
 440 }
 441
 442 static const TypeInfo cpu_type_info = {
 443     .name = TYPE_CPU,
 444     .parent = TYPE_DEVICE,
 445     .instance_size = sizeof(CPUState),
 446     .instance_init = cpu_common_initfn,
 447     .instance_finalize = cpu_common_finalize,
 448     .abstract = true,
 449     .class_size = sizeof(CPUClass),
 450     .class_init = cpu_class_init,
 451 };
 452
 453 static void cpu_register_types(void)
 454 {
 455     type_register_static(&cpu_type_info);
 456 }
 457
 458 type_init(cpu_register_types)