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 "system/hw_accel.h" 25 #include "qemu/log.h" 26 #include "qemu/main-loop.h" 27 #include "qemu/lockcnt.h" 28 #include "exec/log.h" 29 #include "exec/gdbstub.h" 30 #include "system/tcg.h" 31 #include "hw/boards.h" 32 #include "hw/qdev-properties.h" 33 #include "trace.h" 34 #ifdef CONFIG_PLUGIN 35 #include "qemu/plugin.h" 36 #endif 37 38 CPUState *cpu_by_arch_id(int64_t id) 39 { 40 CPUState *cpu; 41 42 CPU_FOREACH(cpu) { 43 if (cpu->cc->get_arch_id(cpu) == id) { 44 return cpu; 45 } 46 } 47 return NULL; 48 } 49 50 bool cpu_exists(int64_t id) 51 { 52 return !!cpu_by_arch_id(id); 53 } 54 55 CPUState *cpu_create(const char *typename) 56 { 57 Error *err = NULL; 58 CPUState *cpu = CPU(object_new(typename)); 59 if (!qdev_realize(DEVICE(cpu), NULL, &err)) { 60 error_report_err(err); 61 object_unref(OBJECT(cpu)); 62 exit(EXIT_FAILURE); 63 } 64 return cpu; 65 } 66 67 /* Resetting the IRQ comes from across the code base so we take the 68 * BQL here if we need to. cpu_interrupt assumes it is held.*/ 69 void cpu_reset_interrupt(CPUState *cpu, int mask) 70 { 71 bool need_lock = !bql_locked(); 72 73 if (need_lock) { 74 bql_lock(); 75 } 76 cpu->interrupt_request &= ~mask; 77 if (need_lock) { 78 bql_unlock(); 79 } 80 } 81 82 void cpu_exit(CPUState *cpu) 83 { 84 qatomic_set(&cpu->exit_request, 1); 85 /* Ensure cpu_exec will see the exit request after TCG has exited. */ 86 smp_wmb(); 87 qatomic_set(&cpu->neg.icount_decr.u16.high, -1); 88 } 89 90 static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) 91 { 92 return 0; 93 } 94 95 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg) 96 { 97 return 0; 98 } 99 100 void cpu_dump_state(CPUState *cpu, FILE *f, int flags) 101 { 102 if (cpu->cc->dump_state) { 103 cpu_synchronize_state(cpu); 104 cpu->cc->dump_state(cpu, f, flags); 105 } 106 } 107 108 void cpu_reset(CPUState *cpu) 109 { 110 device_cold_reset(DEVICE(cpu)); 111 112 trace_cpu_reset(cpu->cpu_index); 113 } 114 115 static void cpu_common_reset_hold(Object *obj, ResetType type) 116 { 117 CPUState *cpu = CPU(obj); 118 119 if (qemu_loglevel_mask(CPU_LOG_RESET)) { 120 qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index); 121 log_cpu_state(cpu, cpu->cc->reset_dump_flags); 122 } 123 124 cpu->interrupt_request = 0; 125 cpu->halted = cpu->start_powered_off; 126 cpu->mem_io_pc = 0; 127 cpu->icount_extra = 0; 128 qatomic_set(&cpu->neg.icount_decr.u32, 0); 129 cpu->neg.can_do_io = true; 130 cpu->exception_index = -1; 131 cpu->crash_occurred = false; 132 cpu->cflags_next_tb = -1; 133 134 cpu_exec_reset_hold(cpu); 135 } 136 137 static bool cpu_common_has_work(CPUState *cs) 138 { 139 return false; 140 } 141 142 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model) 143 { 144 ObjectClass *oc; 145 CPUClass *cc; 146 147 oc = object_class_by_name(typename); 148 cc = CPU_CLASS(oc); 149 assert(cc->class_by_name); 150 assert(cpu_model); 151 oc = cc->class_by_name(cpu_model); 152 if (object_class_dynamic_cast(oc, typename) && 153 !object_class_is_abstract(oc)) { 154 return oc; 155 } 156 157 return NULL; 158 } 159 160 static void cpu_common_parse_features(const char *typename, char *features, 161 Error **errp) 162 { 163 char *val; 164 static bool cpu_globals_initialized; 165 /* Single "key=value" string being parsed */ 166 char *featurestr = features ? strtok(features, ",") : NULL; 167 168 /* should be called only once, catch invalid users */ 169 assert(!cpu_globals_initialized); 170 cpu_globals_initialized = true; 171 172 while (featurestr) { 173 val = strchr(featurestr, '='); 174 if (val) { 175 GlobalProperty *prop = g_new0(typeof(*prop), 1); 176 *val = 0; 177 val++; 178 prop->driver = typename; 179 prop->property = g_strdup(featurestr); 180 prop->value = g_strdup(val); 181 qdev_prop_register_global(prop); 182 } else { 183 error_setg(errp, "Expected key=value format, found %s.", 184 featurestr); 185 return; 186 } 187 featurestr = strtok(NULL, ","); 188 } 189 } 190 191 bool cpu_exec_realizefn(CPUState *cpu, Error **errp) 192 { 193 if (!accel_cpu_common_realize(cpu, errp)) { 194 return false; 195 } 196 197 /* Wait until cpu initialization complete before exposing cpu. */ 198 cpu_list_add(cpu); 199 200 cpu_vmstate_register(cpu); 201 202 return true; 203 } 204 205 static void cpu_common_realizefn(DeviceState *dev, Error **errp) 206 { 207 CPUState *cpu = CPU(dev); 208 Object *machine = qdev_get_machine(); 209 210 /* qdev_get_machine() can return something that's not TYPE_MACHINE 211 * if this is one of the user-only emulators; in that case there's 212 * no need to check the ignore_memory_transaction_failures board flag. 213 */ 214 if (object_dynamic_cast(machine, TYPE_MACHINE)) { 215 MachineClass *mc = MACHINE_GET_CLASS(machine); 216 217 if (mc) { 218 cpu->ignore_memory_transaction_failures = 219 mc->ignore_memory_transaction_failures; 220 } 221 } 222 223 if (dev->hotplugged) { 224 cpu_synchronize_post_init(cpu); 225 cpu_resume(cpu); 226 } 227 228 /* NOTE: latest generic point where the cpu is fully realized */ 229 } 230 231 static void cpu_common_unrealizefn(DeviceState *dev) 232 { 233 CPUState *cpu = CPU(dev); 234 235 /* Call the plugin hook before clearing the cpu is fully unrealized */ 236 #ifdef CONFIG_PLUGIN 237 if (tcg_enabled()) { 238 qemu_plugin_vcpu_exit_hook(cpu); 239 } 240 #endif 241 242 /* NOTE: latest generic point before the cpu is fully unrealized */ 243 cpu_exec_unrealizefn(cpu); 244 } 245 246 void cpu_exec_unrealizefn(CPUState *cpu) 247 { 248 cpu_vmstate_unregister(cpu); 249 250 cpu_list_remove(cpu); 251 /* 252 * Now that the vCPU has been removed from the RCU list, we can call 253 * accel_cpu_common_unrealize, which may free fields using call_rcu. 254 */ 255 accel_cpu_common_unrealize(cpu); 256 } 257 258 static void cpu_common_initfn(Object *obj) 259 { 260 CPUState *cpu = CPU(obj); 261 262 /* cache the cpu class for the hotpath */ 263 cpu->cc = CPU_GET_CLASS(cpu); 264 265 gdb_init_cpu(cpu); 266 cpu->cpu_index = UNASSIGNED_CPU_INDEX; 267 cpu->cluster_index = UNASSIGNED_CLUSTER_INDEX; 268 cpu->as = NULL; 269 cpu->num_ases = 0; 270 /* user-mode doesn't have configurable SMP topology */ 271 /* the default value is changed by qemu_init_vcpu() for system-mode */ 272 cpu->nr_threads = 1; 273 274 /* allocate storage for thread info, initialise condition variables */ 275 cpu->thread = g_new0(QemuThread, 1); 276 cpu->halt_cond = g_new0(QemuCond, 1); 277 qemu_cond_init(cpu->halt_cond); 278 279 qemu_mutex_init(&cpu->work_mutex); 280 qemu_lockcnt_init(&cpu->in_ioctl_lock); 281 QSIMPLEQ_INIT(&cpu->work_list); 282 QTAILQ_INIT(&cpu->breakpoints); 283 QTAILQ_INIT(&cpu->watchpoints); 284 285 cpu_exec_initfn(cpu); 286 287 /* 288 * Plugin initialization must wait until the cpu start executing 289 * code, but we must queue this work before the threads are 290 * created to ensure we don't race. 291 */ 292 #ifdef CONFIG_PLUGIN 293 if (tcg_enabled()) { 294 cpu->plugin_state = qemu_plugin_create_vcpu_state(); 295 qemu_plugin_vcpu_init_hook(cpu); 296 } 297 #endif 298 } 299 300 static void cpu_common_finalize(Object *obj) 301 { 302 CPUState *cpu = CPU(obj); 303 304 #ifdef CONFIG_PLUGIN 305 if (tcg_enabled()) { 306 g_free(cpu->plugin_state); 307 } 308 #endif 309 free_queued_cpu_work(cpu); 310 /* If cleanup didn't happen in context to gdb_unregister_coprocessor_all */ 311 if (cpu->gdb_regs) { 312 g_array_free(cpu->gdb_regs, TRUE); 313 } 314 qemu_lockcnt_destroy(&cpu->in_ioctl_lock); 315 qemu_mutex_destroy(&cpu->work_mutex); 316 qemu_cond_destroy(cpu->halt_cond); 317 g_free(cpu->halt_cond); 318 g_free(cpu->thread); 319 } 320 321 static int64_t cpu_common_get_arch_id(CPUState *cpu) 322 { 323 return cpu->cpu_index; 324 } 325 326 static void cpu_common_class_init(ObjectClass *klass, void *data) 327 { 328 DeviceClass *dc = DEVICE_CLASS(klass); 329 ResettableClass *rc = RESETTABLE_CLASS(klass); 330 CPUClass *k = CPU_CLASS(klass); 331 332 k->parse_features = cpu_common_parse_features; 333 k->get_arch_id = cpu_common_get_arch_id; 334 k->has_work = cpu_common_has_work; 335 k->gdb_read_register = cpu_common_gdb_read_register; 336 k->gdb_write_register = cpu_common_gdb_write_register; 337 set_bit(DEVICE_CATEGORY_CPU, dc->categories); 338 dc->realize = cpu_common_realizefn; 339 dc->unrealize = cpu_common_unrealizefn; 340 rc->phases.hold = cpu_common_reset_hold; 341 cpu_class_init_props(dc); 342 /* 343 * Reason: CPUs still need special care by board code: wiring up 344 * IRQs, adding reset handlers, halting non-first CPUs, ... 345 */ 346 dc->user_creatable = false; 347 } 348 349 static const TypeInfo cpu_type_info = { 350 .name = TYPE_CPU, 351 .parent = TYPE_DEVICE, 352 .instance_size = sizeof(CPUState), 353 .instance_init = cpu_common_initfn, 354 .instance_finalize = cpu_common_finalize, 355 .abstract = true, 356 .class_size = sizeof(CPUClass), 357 .class_init = cpu_common_class_init, 358 }; 359 360 static void cpu_register_types(void) 361 { 362 type_register_static(&cpu_type_info); 363 } 364 365 type_init(cpu_register_types) 366