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