qom/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 "qemu-common.h"
  24 #include "qom/cpu.h"
  25 #include "sysemu/kvm.h"
  26 #include "qemu/notify.h"
  27 #include "qemu/log.h"
  28 #include "exec/log.h"
  29 #include "qemu/error-report.h"
  30 #include "sysemu/sysemu.h"
  31 #include "hw/qdev-properties.h"
  32
  33 bool cpu_exists(int64_t id)
  34 {
  35     CPUState *cpu;
  36
  37     CPU_FOREACH(cpu) {
  38         CPUClass *cc = CPU_GET_CLASS(cpu);
  39
  40         if (cc->get_arch_id(cpu) == id) {
  41             return true;
  42         }
  43     }
  44     return false;
  45 }
  46
  47 CPUState *cpu_generic_init(const char *typename, const char *cpu_model)
  48 {
  49     char *str, *name, *featurestr;
  50     CPUState *cpu = NULL;
  51     ObjectClass *oc;
  52     CPUClass *cc;
  53     Error *err = NULL;
  54
  55     str = g_strdup(cpu_model);
  56     name = strtok(str, ",");
  57
  58     oc = cpu_class_by_name(typename, name);
  59     if (oc == NULL) {
  60         g_free(str);
  61         return NULL;
  62     }
  63
  64     cc = CPU_CLASS(oc);
  65     featurestr = strtok(NULL, ",");
  66     /* TODO: all callers of cpu_generic_init() need to be converted to
  67      * call parse_features() only once, before calling cpu_generic_init().
  68      */
  69     cc->parse_features(object_class_get_name(oc), featurestr, &err);
  70     g_free(str);
  71     if (err != NULL) {
  72         goto out;
  73     }
  74
  75     cpu = CPU(object_new(object_class_get_name(oc)));
  76     object_property_set_bool(OBJECT(cpu), true, "realized", &err);
  77
  78 out:
  79     if (err != NULL) {
  80         error_report_err(err);
  81         object_unref(OBJECT(cpu));
  82         return NULL;
  83     }
  84
  85     return cpu;
  86 }
  87
  88 bool cpu_paging_enabled(const CPUState *cpu)
  89 {
  90     CPUClass *cc = CPU_GET_CLASS(cpu);
  91
  92     return cc->get_paging_enabled(cpu);
  93 }
  94
  95 static bool cpu_common_get_paging_enabled(const CPUState *cpu)
  96 {
  97     return false;
  98 }
  99
 100 void cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
 101                             Error **errp)
 102 {
 103     CPUClass *cc = CPU_GET_CLASS(cpu);
 104
 105     cc->get_memory_mapping(cpu, list, errp);
 106 }
 107
 108 static void cpu_common_get_memory_mapping(CPUState *cpu,
 109                                           MemoryMappingList *list,
 110                                           Error **errp)
 111 {
 112     error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
 113 }
 114
 115 void cpu_reset_interrupt(CPUState *cpu, int mask)
 116 {
 117     cpu->interrupt_request &= ~mask;
 118 }
 119
 120 void cpu_exit(CPUState *cpu)
 121 {
 122     cpu->exit_request = 1;
 123     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
 124     smp_wmb();
 125     cpu->tcg_exit_req = 1;
 126 }
 127
 128 int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 129                              void *opaque)
 130 {
 131     CPUClass *cc = CPU_GET_CLASS(cpu);
 132
 133     return (*cc->write_elf32_qemunote)(f, cpu, opaque);
 134 }
 135
 136 static int cpu_common_write_elf32_qemunote(WriteCoreDumpFunction f,
 137                                            CPUState *cpu, void *opaque)
 138 {
 139     return 0;
 140 }
 141
 142 int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
 143                          int cpuid, void *opaque)
 144 {
 145     CPUClass *cc = CPU_GET_CLASS(cpu);
 146
 147     return (*cc->write_elf32_note)(f, cpu, cpuid, opaque);
 148 }
 149
 150 static int cpu_common_write_elf32_note(WriteCoreDumpFunction f,
 151                                        CPUState *cpu, int cpuid,
 152                                        void *opaque)
 153 {
 154     return -1;
 155 }
 156
 157 int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 158                              void *opaque)
 159 {
 160     CPUClass *cc = CPU_GET_CLASS(cpu);
 161
 162     return (*cc->write_elf64_qemunote)(f, cpu, opaque);
 163 }
 164
 165 static int cpu_common_write_elf64_qemunote(WriteCoreDumpFunction f,
 166                                            CPUState *cpu, void *opaque)
 167 {
 168     return 0;
 169 }
 170
 171 int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
 172                          int cpuid, void *opaque)
 173 {
 174     CPUClass *cc = CPU_GET_CLASS(cpu);
 175
 176     return (*cc->write_elf64_note)(f, cpu, cpuid, opaque);
 177 }
 178
 179 static int cpu_common_write_elf64_note(WriteCoreDumpFunction f,
 180                                        CPUState *cpu, int cpuid,
 181                                        void *opaque)
 182 {
 183     return -1;
 184 }
 185
 186
 187 static int cpu_common_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg)
 188 {
 189     return 0;
 190 }
 191
 192 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
 193 {
 194     return 0;
 195 }
 196
 197 static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
 198 {
 199     /* If no extra check is required, QEMU watchpoint match can be considered
 200      * as an architectural match.
 201      */
 202     return true;
 203 }
 204
 205 bool target_words_bigendian(void);
 206 static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
 207 {
 208     return target_words_bigendian();
 209 }
 210
 211 static void cpu_common_noop(CPUState *cpu)
 212 {
 213 }
 214
 215 static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
 216 {
 217     return false;
 218 }
 219
 220 void cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 221                     int flags)
 222 {
 223     CPUClass *cc = CPU_GET_CLASS(cpu);
 224
 225     if (cc->dump_state) {
 226         cpu_synchronize_state(cpu);
 227         cc->dump_state(cpu, f, cpu_fprintf, flags);
 228     }
 229 }
 230
 231 void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 232                          int flags)
 233 {
 234     CPUClass *cc = CPU_GET_CLASS(cpu);
 235
 236     if (cc->dump_statistics) {
 237         cc->dump_statistics(cpu, f, cpu_fprintf, flags);
 238     }
 239 }
 240
 241 void cpu_reset(CPUState *cpu)
 242 {
 243     CPUClass *klass = CPU_GET_CLASS(cpu);
 244
 245     if (klass->reset != NULL) {
 246         (*klass->reset)(cpu);
 247     }
 248 }
 249
 250 static void cpu_common_reset(CPUState *cpu)
 251 {
 252     CPUClass *cc = CPU_GET_CLASS(cpu);
 253
 254     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
 255         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
 256         log_cpu_state(cpu, cc->reset_dump_flags);
 257     }
 258
 259     cpu->interrupt_request = 0;
 260     cpu->halted = 0;
 261     cpu->mem_io_pc = 0;
 262     cpu->mem_io_vaddr = 0;
 263     cpu->icount_extra = 0;
 264     cpu->icount_decr.u32 = 0;
 265     cpu->can_do_io = 1;
 266     cpu->exception_index = -1;
 267     cpu->crash_occurred = false;
 268     memset(cpu->tb_jmp_cache, 0, TB_JMP_CACHE_SIZE * sizeof(void *));
 269 }
 270
 271 static bool cpu_common_has_work(CPUState *cs)
 272 {
 273     return false;
 274 }
 275
 276 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 277 {
 278     CPUClass *cc = CPU_CLASS(object_class_by_name(typename));
 279
 280     return cc->class_by_name(cpu_model);
 281 }
 282
 283 static ObjectClass *cpu_common_class_by_name(const char *cpu_model)
 284 {
 285     return NULL;
 286 }
 287
 288 static void cpu_common_parse_features(const char *typename, char *features,
 289                                       Error **errp)
 290 {
 291     char *featurestr; /* Single "key=value" string being parsed */
 292     char *val;
 293     static bool cpu_globals_initialized;
 294
 295     /* TODO: all callers of ->parse_features() need to be changed to
 296      * call it only once, so we can remove this check (or change it
 297      * to assert(!cpu_globals_initialized).
 298      * Current callers of ->parse_features() are:
 299      * - cpu_generic_init()
 300      */
 301     if (cpu_globals_initialized) {
 302         return;
 303     }
 304     cpu_globals_initialized = true;
 305
 306     featurestr = features ? strtok(features, ",") : NULL;
 307
 308     while (featurestr) {
 309         val = strchr(featurestr, '=');
 310         if (val) {
 311             GlobalProperty *prop = g_new0(typeof(*prop), 1);
 312             *val = 0;
 313             val++;
 314             prop->driver = typename;
 315             prop->property = g_strdup(featurestr);
 316             prop->value = g_strdup(val);
 317             prop->errp = &error_fatal;
 318             qdev_prop_register_global(prop);
 319         } else {
 320             error_setg(errp, "Expected key=value format, found %s.",
 321                        featurestr);
 322             return;
 323         }
 324         featurestr = strtok(NULL, ",");
 325     }
 326 }
 327
 328 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 329 {
 330     CPUState *cpu = CPU(dev);
 331
 332     if (dev->hotplugged) {
 333         cpu_synchronize_post_init(cpu);
 334         cpu_resume(cpu);
 335     }
 336 }
 337
 338 static void cpu_common_initfn(Object *obj)
 339 {
 340     CPUState *cpu = CPU(obj);
 341     CPUClass *cc = CPU_GET_CLASS(obj);
 342
 343     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
 344     cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
 345     /* *-user doesn't have configurable SMP topology */
 346     /* the default value is changed by qemu_init_vcpu() for softmmu */
 347     cpu->nr_cores = 1;
 348     cpu->nr_threads = 1;
 349
 350     qemu_mutex_init(&cpu->work_mutex);
 351     QTAILQ_INIT(&cpu->breakpoints);
 352     QTAILQ_INIT(&cpu->watchpoints);
 353     bitmap_zero(cpu->trace_dstate, TRACE_VCPU_EVENT_COUNT);
 354 }
 355
 356 static void cpu_common_finalize(Object *obj)
 357 {
 358     cpu_exec_exit(CPU(obj));
 359 }
 360
 361 static int64_t cpu_common_get_arch_id(CPUState *cpu)
 362 {
 363     return cpu->cpu_index;
 364 }
 365
 366 static void cpu_class_init(ObjectClass *klass, void *data)
 367 {
 368     DeviceClass *dc = DEVICE_CLASS(klass);
 369     CPUClass *k = CPU_CLASS(klass);
 370
 371     k->class_by_name = cpu_common_class_by_name;
 372     k->parse_features = cpu_common_parse_features;
 373     k->reset = cpu_common_reset;
 374     k->get_arch_id = cpu_common_get_arch_id;
 375     k->has_work = cpu_common_has_work;
 376     k->get_paging_enabled = cpu_common_get_paging_enabled;
 377     k->get_memory_mapping = cpu_common_get_memory_mapping;
 378     k->write_elf32_qemunote = cpu_common_write_elf32_qemunote;
 379     k->write_elf32_note = cpu_common_write_elf32_note;
 380     k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
 381     k->write_elf64_note = cpu_common_write_elf64_note;
 382     k->gdb_read_register = cpu_common_gdb_read_register;
 383     k->gdb_write_register = cpu_common_gdb_write_register;
 384     k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
 385     k->debug_excp_handler = cpu_common_noop;
 386     k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
 387     k->cpu_exec_enter = cpu_common_noop;
 388     k->cpu_exec_exit = cpu_common_noop;
 389     k->cpu_exec_interrupt = cpu_common_exec_interrupt;
 390     dc->realize = cpu_common_realizefn;
 391     /*
 392      * Reason: CPUs still need special care by board code: wiring up
 393      * IRQs, adding reset handlers, halting non-first CPUs, ...
 394      */
 395     dc->cannot_instantiate_with_device_add_yet = true;
 396 }
 397
 398 static const TypeInfo cpu_type_info = {
 399     .name = TYPE_CPU,
 400     .parent = TYPE_DEVICE,
 401     .instance_size = sizeof(CPUState),
 402     .instance_init = cpu_common_initfn,
 403     .instance_finalize = cpu_common_finalize,
 404     .abstract = true,
 405     .class_size = sizeof(CPUClass),
 406     .class_init = cpu_class_init,
 407 };
 408
 409 static void cpu_register_types(void)
 410 {
 411     type_register_static(&cpu_type_info);
 412 }
 413
 414 type_init(cpu_register_types)