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-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     object_property_set_bool(OBJECT(cpu), true, "realized", &err);
  63     if (err != NULL) {
  64         error_report_err(err);
  65         object_unref(OBJECT(cpu));
  66         exit(EXIT_FAILURE);
  67     }
  68     return cpu;
  69 }
  70
  71 bool cpu_paging_enabled(const CPUState *cpu)
  72 {
  73     CPUClass *cc = CPU_GET_CLASS(cpu);
  74
  75     return cc->get_paging_enabled(cpu);
  76 }
  77
  78 static bool cpu_common_get_paging_enabled(const CPUState *cpu)
  79 {
  80     return false;
  81 }
  82
  83 void cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
  84                             Error **errp)
  85 {
  86     CPUClass *cc = CPU_GET_CLASS(cpu);
  87
  88     cc->get_memory_mapping(cpu, list, errp);
  89 }
  90
  91 static void cpu_common_get_memory_mapping(CPUState *cpu,
  92                                           MemoryMappingList *list,
  93                                           Error **errp)
  94 {
  95     error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
  96 }
  97
  98 /* Resetting the IRQ comes from across the code base so we take the
  99  * BQL here if we need to.  cpu_interrupt assumes it is held.*/
 100 void cpu_reset_interrupt(CPUState *cpu, int mask)
 101 {
 102     bool need_lock = !qemu_mutex_iothread_locked();
 103
 104     if (need_lock) {
 105         qemu_mutex_lock_iothread();
 106     }
 107     cpu->interrupt_request &= ~mask;
 108     if (need_lock) {
 109         qemu_mutex_unlock_iothread();
 110     }
 111 }
 112
 113 void cpu_exit(CPUState *cpu)
 114 {
 115     atomic_set(&cpu->exit_request, 1);
 116     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
 117     smp_wmb();
 118     atomic_set(&cpu->icount_decr_ptr->u16.high, -1);
 119 }
 120
 121 int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 122                              void *opaque)
 123 {
 124     CPUClass *cc = CPU_GET_CLASS(cpu);
 125
 126     return (*cc->write_elf32_qemunote)(f, cpu, opaque);
 127 }
 128
 129 static int cpu_common_write_elf32_qemunote(WriteCoreDumpFunction f,
 130                                            CPUState *cpu, void *opaque)
 131 {
 132     return 0;
 133 }
 134
 135 int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
 136                          int cpuid, void *opaque)
 137 {
 138     CPUClass *cc = CPU_GET_CLASS(cpu);
 139
 140     return (*cc->write_elf32_note)(f, cpu, cpuid, opaque);
 141 }
 142
 143 static int cpu_common_write_elf32_note(WriteCoreDumpFunction f,
 144                                        CPUState *cpu, int cpuid,
 145                                        void *opaque)
 146 {
 147     return -1;
 148 }
 149
 150 int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 151                              void *opaque)
 152 {
 153     CPUClass *cc = CPU_GET_CLASS(cpu);
 154
 155     return (*cc->write_elf64_qemunote)(f, cpu, opaque);
 156 }
 157
 158 static int cpu_common_write_elf64_qemunote(WriteCoreDumpFunction f,
 159                                            CPUState *cpu, void *opaque)
 160 {
 161     return 0;
 162 }
 163
 164 int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
 165                          int cpuid, void *opaque)
 166 {
 167     CPUClass *cc = CPU_GET_CLASS(cpu);
 168
 169     return (*cc->write_elf64_note)(f, cpu, cpuid, opaque);
 170 }
 171
 172 static int cpu_common_write_elf64_note(WriteCoreDumpFunction f,
 173                                        CPUState *cpu, int cpuid,
 174                                        void *opaque)
 175 {
 176     return -1;
 177 }
 178
 179
 180 static int cpu_common_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg)
 181 {
 182     return 0;
 183 }
 184
 185 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
 186 {
 187     return 0;
 188 }
 189
 190 static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
 191 {
 192     /* If no extra check is required, QEMU watchpoint match can be considered
 193      * as an architectural match.
 194      */
 195     return true;
 196 }
 197
 198 static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
 199 {
 200     return target_words_bigendian();
 201 }
 202
 203 static void cpu_common_noop(CPUState *cpu)
 204 {
 205 }
 206
 207 static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
 208 {
 209     return false;
 210 }
 211
 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
 223 void cpu_dump_state(CPUState *cpu, FILE *f, int flags)
 224 {
 225     CPUClass *cc = CPU_GET_CLASS(cpu);
 226
 227     if (cc->dump_state) {
 228         cpu_synchronize_state(cpu);
 229         cc->dump_state(cpu, f, flags);
 230     }
 231 }
 232
 233 void cpu_dump_statistics(CPUState *cpu, int flags)
 234 {
 235     CPUClass *cc = CPU_GET_CLASS(cpu);
 236
 237     if (cc->dump_statistics) {
 238         cc->dump_statistics(cpu, flags);
 239     }
 240 }
 241
 242 void cpu_reset(CPUState *cpu)
 243 {
 244     CPUClass *klass = CPU_GET_CLASS(cpu);
 245
 246     if (klass->reset != NULL) {
 247         (*klass->reset)(cpu);
 248     }
 249
 250     trace_guest_cpu_reset(cpu);
 251 }
 252
 253 static void cpu_common_reset(CPUState *cpu)
 254 {
 255     CPUClass *cc = CPU_GET_CLASS(cpu);
 256
 257     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
 258         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
 259         log_cpu_state(cpu, cc->reset_dump_flags);
 260     }
 261
 262     cpu->interrupt_request = 0;
 263     cpu->halted = 0;
 264     cpu->mem_io_pc = 0;
 265     cpu->icount_extra = 0;
 266     atomic_set(&cpu->icount_decr_ptr->u32, 0);
 267     cpu->can_do_io = 1;
 268     cpu->exception_index = -1;
 269     cpu->crash_occurred = false;
 270     cpu->cflags_next_tb = -1;
 271
 272     if (tcg_enabled()) {
 273         cpu_tb_jmp_cache_clear(cpu);
 274
 275         tcg_flush_softmmu_tlb(cpu);
 276     }
 277 }
 278
 279 static bool cpu_common_has_work(CPUState *cs)
 280 {
 281     return false;
 282 }
 283
 284 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 285 {
 286     CPUClass *cc = CPU_CLASS(object_class_by_name(typename));
 287
 288     assert(cpu_model && cc->class_by_name);
 289     return cc->class_by_name(cpu_model);
 290 }
 291
 292 static void cpu_common_parse_features(const char *typename, char *features,
 293                                       Error **errp)
 294 {
 295     char *val;
 296     static bool cpu_globals_initialized;
 297     /* Single "key=value" string being parsed */
 298     char *featurestr = features ? strtok(features, ",") : NULL;
 299
 300     /* should be called only once, catch invalid users */
 301     assert(!cpu_globals_initialized);
 302     cpu_globals_initialized = true;
 303
 304     while (featurestr) {
 305         val = strchr(featurestr, '=');
 306         if (val) {
 307             GlobalProperty *prop = g_new0(typeof(*prop), 1);
 308             *val = 0;
 309             val++;
 310             prop->driver = typename;
 311             prop->property = g_strdup(featurestr);
 312             prop->value = g_strdup(val);
 313             qdev_prop_register_global(prop);
 314         } else {
 315             error_setg(errp, "Expected key=value format, found %s.",
 316                        featurestr);
 317             return;
 318         }
 319         featurestr = strtok(NULL, ",");
 320     }
 321 }
 322
 323 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 324 {
 325     CPUState *cpu = CPU(dev);
 326     Object *machine = qdev_get_machine();
 327
 328     /* qdev_get_machine() can return something that's not TYPE_MACHINE
 329      * if this is one of the user-only emulators; in that case there's
 330      * no need to check the ignore_memory_transaction_failures board flag.
 331      */
 332     if (object_dynamic_cast(machine, TYPE_MACHINE)) {
 333         ObjectClass *oc = object_get_class(machine);
 334         MachineClass *mc = MACHINE_CLASS(oc);
 335
 336         if (mc) {
 337             cpu->ignore_memory_transaction_failures =
 338                 mc->ignore_memory_transaction_failures;
 339         }
 340     }
 341
 342     if (dev->hotplugged) {
 343         cpu_synchronize_post_init(cpu);
 344         cpu_resume(cpu);
 345     }
 346
 347     /* NOTE: latest generic point where the cpu is fully realized */
 348     trace_init_vcpu(cpu);
 349 }
 350
 351 static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
 352 {
 353     CPUState *cpu = CPU(dev);
 354     /* NOTE: latest generic point before the cpu is fully unrealized */
 355     trace_fini_vcpu(cpu);
 356     qemu_plugin_vcpu_exit_hook(cpu);
 357     cpu_exec_unrealizefn(cpu);
 358 }
 359
 360 static void cpu_common_initfn(Object *obj)
 361 {
 362     CPUState *cpu = CPU(obj);
 363     CPUClass *cc = CPU_GET_CLASS(obj);
 364
 365     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
 366     cpu->cluster_index = UNASSIGNED_CLUSTER_INDEX;
 367     cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
 368     /* *-user doesn't have configurable SMP topology */
 369     /* the default value is changed by qemu_init_vcpu() for softmmu */
 370     cpu->nr_cores = 1;
 371     cpu->nr_threads = 1;
 372
 373     qemu_mutex_init(&cpu->work_mutex);
 374     QTAILQ_INIT(&cpu->breakpoints);
 375     QTAILQ_INIT(&cpu->watchpoints);
 376
 377     cpu_exec_initfn(cpu);
 378 }
 379
 380 static void cpu_common_finalize(Object *obj)
 381 {
 382     CPUState *cpu = CPU(obj);
 383
 384     qemu_mutex_destroy(&cpu->work_mutex);
 385 }
 386
 387 static int64_t cpu_common_get_arch_id(CPUState *cpu)
 388 {
 389     return cpu->cpu_index;
 390 }
 391
 392 static vaddr cpu_adjust_watchpoint_address(CPUState *cpu, vaddr addr, int len)
 393 {
 394     return addr;
 395 }
 396
 397 static void generic_handle_interrupt(CPUState *cpu, int mask)
 398 {
 399     cpu->interrupt_request |= mask;
 400
 401     if (!qemu_cpu_is_self(cpu)) {
 402         qemu_cpu_kick(cpu);
 403     }
 404 }
 405
 406 CPUInterruptHandler cpu_interrupt_handler = generic_handle_interrupt;
 407
 408 static void cpu_class_init(ObjectClass *klass, void *data)
 409 {
 410     DeviceClass *dc = DEVICE_CLASS(klass);
 411     CPUClass *k = CPU_CLASS(klass);
 412
 413     k->parse_features = cpu_common_parse_features;
 414     k->reset = cpu_common_reset;
 415     k->get_arch_id = cpu_common_get_arch_id;
 416     k->has_work = cpu_common_has_work;
 417     k->get_paging_enabled = cpu_common_get_paging_enabled;
 418     k->get_memory_mapping = cpu_common_get_memory_mapping;
 419     k->write_elf32_qemunote = cpu_common_write_elf32_qemunote;
 420     k->write_elf32_note = cpu_common_write_elf32_note;
 421     k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
 422     k->write_elf64_note = cpu_common_write_elf64_note;
 423     k->gdb_read_register = cpu_common_gdb_read_register;
 424     k->gdb_write_register = cpu_common_gdb_write_register;
 425     k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
 426     k->debug_excp_handler = cpu_common_noop;
 427     k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
 428     k->cpu_exec_enter = cpu_common_noop;
 429     k->cpu_exec_exit = cpu_common_noop;
 430     k->cpu_exec_interrupt = cpu_common_exec_interrupt;
 431     k->adjust_watchpoint_address = cpu_adjust_watchpoint_address;
 432     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
 433     dc->realize = cpu_common_realizefn;
 434     dc->unrealize = cpu_common_unrealizefn;
 435     dc->props = cpu_common_props;
 436     /*
 437      * Reason: CPUs still need special care by board code: wiring up
 438      * IRQs, adding reset handlers, halting non-first CPUs, ...
 439      */
 440     dc->user_creatable = false;
 441 }
 442
 443 static const TypeInfo cpu_type_info = {
 444     .name = TYPE_CPU,
 445     .parent = TYPE_DEVICE,
 446     .instance_size = sizeof(CPUState),
 447     .instance_init = cpu_common_initfn,
 448     .instance_finalize = cpu_common_finalize,
 449     .abstract = true,
 450     .class_size = sizeof(CPUClass),
 451     .class_init = cpu_class_init,
 452 };
 453
 454 static void cpu_register_types(void)
 455 {
 456     type_register_static(&cpu_type_info);
 457 }
 458
 459 type_init(cpu_register_types)