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