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