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