hw/core/cpu-common.c - qemu - Git at Google

 /*
  * QEMU CPU model
  *
  * Copyright (c) 2012-2014 SUSE LINUX Products GmbH
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see
  * <http://www.gnu.org/licenses/gpl-2.0.html>
  */

 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "hw/core/cpu.h"
 #include "sysemu/hw_accel.h"
 #include "qemu/log.h"
 #include "qemu/main-loop.h"
 #include "exec/log.h"
 #include "exec/gdbstub.h"
 #include "sysemu/tcg.h"
 #include "hw/boards.h"
 #include "hw/qdev-properties.h"
 #include "trace.h"
 #ifdef CONFIG_PLUGIN
 #include "qemu/plugin.h"
 #endif

 CPUState *cpu_by_arch_id(int64_t id)
 {
     CPUState *cpu;

     CPU_FOREACH(cpu) {
         CPUClass *cc = CPU_GET_CLASS(cpu);

         if (cc->get_arch_id(cpu) == id) {
             return cpu;
         }
     }
     return NULL;
 }

 bool cpu_exists(int64_t id)
 {
     return !!cpu_by_arch_id(id);
 }

 CPUState *cpu_create(const char *typename)
 {
     Error *err = NULL;
     CPUState *cpu = CPU(object_new(typename));
     if (!qdev_realize(DEVICE(cpu), NULL, &err)) {
         error_report_err(err);
         object_unref(OBJECT(cpu));
         exit(EXIT_FAILURE);
     }
     return cpu;
 }

 /* Resetting the IRQ comes from across the code base so we take the
  * BQL here if we need to.  cpu_interrupt assumes it is held.*/
 void cpu_reset_interrupt(CPUState *cpu, int mask)
 {
     bool need_lock = !bql_locked();

     if (need_lock) {
         bql_lock();
     }
     cpu->interrupt_request &= ~mask;
     if (need_lock) {
         bql_unlock();
     }
 }

 void cpu_exit(CPUState *cpu)
 {
     qatomic_set(&cpu->exit_request, 1);
     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
     smp_wmb();
     qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
 }

 static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
 {
     return 0;
 }

 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
 {
     return 0;
 }

 void cpu_dump_state(CPUState *cpu, FILE *f, int flags)
 {
     CPUClass *cc = CPU_GET_CLASS(cpu);

     if (cc->dump_state) {
         cpu_synchronize_state(cpu);
         cc->dump_state(cpu, f, flags);
     }
 }

 void cpu_reset(CPUState *cpu)
 {
     device_cold_reset(DEVICE(cpu));

     trace_cpu_reset(cpu->cpu_index);
 }

 static void cpu_common_reset_hold(Object *obj, ResetType type)
 {
     CPUState *cpu = CPU(obj);
     CPUClass *cc = CPU_GET_CLASS(cpu);

     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
         log_cpu_state(cpu, cc->reset_dump_flags);
     }

     cpu->interrupt_request = 0;
     cpu->halted = cpu->start_powered_off;
     cpu->mem_io_pc = 0;
     cpu->icount_extra = 0;
     qatomic_set(&cpu->neg.icount_decr.u32, 0);
     cpu->neg.can_do_io = true;
     cpu->exception_index = -1;
     cpu->crash_occurred = false;
     cpu->cflags_next_tb = -1;

     cpu_exec_reset_hold(cpu);
 }

 static bool cpu_common_has_work(CPUState *cs)
 {
     return false;
 }

 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 {
     ObjectClass *oc;
     CPUClass *cc;

     oc = object_class_by_name(typename);
     cc = CPU_CLASS(oc);
     assert(cc->class_by_name);
     assert(cpu_model);
     oc = cc->class_by_name(cpu_model);
     if (object_class_dynamic_cast(oc, typename) &&
         !object_class_is_abstract(oc)) {
         return oc;
     }

     return NULL;
 }

 static void cpu_common_parse_features(const char *typename, char *features,
                                       Error **errp)
 {
     char *val;
     static bool cpu_globals_initialized;
     /* Single "key=value" string being parsed */
     char *featurestr = features ? strtok(features, ",") : NULL;

     /* should be called only once, catch invalid users */
     assert(!cpu_globals_initialized);
     cpu_globals_initialized = true;

     while (featurestr) {
         val = strchr(featurestr, '=');
         if (val) {
             GlobalProperty *prop = g_new0(typeof(*prop), 1);
             *val = 0;
             val++;
             prop->driver = typename;
             prop->property = g_strdup(featurestr);
             prop->value = g_strdup(val);
             qdev_prop_register_global(prop);
         } else {
             error_setg(errp, "Expected key=value format, found %s.",
                        featurestr);
             return;
         }
         featurestr = strtok(NULL, ",");
     }
 }

 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cpu = CPU(dev);
     Object *machine = qdev_get_machine();

     /* qdev_get_machine() can return something that's not TYPE_MACHINE
      * if this is one of the user-only emulators; in that case there's
      * no need to check the ignore_memory_transaction_failures board flag.
      */
     if (object_dynamic_cast(machine, TYPE_MACHINE)) {
         MachineClass *mc = MACHINE_GET_CLASS(machine);

         if (mc) {
             cpu->ignore_memory_transaction_failures =
                 mc->ignore_memory_transaction_failures;
         }
     }

     if (dev->hotplugged) {
         cpu_synchronize_post_init(cpu);
         cpu_resume(cpu);
     }

     /* NOTE: latest generic point where the cpu is fully realized */
 }

 static void cpu_common_unrealizefn(DeviceState *dev)
 {
     CPUState *cpu = CPU(dev);

     /* Call the plugin hook before clearing the cpu is fully unrealized */
 #ifdef CONFIG_PLUGIN
     if (tcg_enabled()) {
         qemu_plugin_vcpu_exit_hook(cpu);
     }
 #endif

     /* NOTE: latest generic point before the cpu is fully unrealized */
     cpu_exec_unrealizefn(cpu);
 }

 static void cpu_common_initfn(Object *obj)
 {
     CPUState *cpu = CPU(obj);

     gdb_init_cpu(cpu);
     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
     cpu->cluster_index = UNASSIGNED_CLUSTER_INDEX;
     /* user-mode doesn't have configurable SMP topology */
     /* the default value is changed by qemu_init_vcpu() for system-mode */
     cpu->nr_cores = 1;
     cpu->nr_threads = 1;
     cpu->cflags_next_tb = -1;

     /* allocate storage for thread info, initialise condition variables */
     cpu->thread = g_new0(QemuThread, 1);
     cpu->halt_cond = g_new0(QemuCond, 1);
     qemu_cond_init(cpu->halt_cond);

     qemu_mutex_init(&cpu->work_mutex);
     qemu_lockcnt_init(&cpu->in_ioctl_lock);
     QSIMPLEQ_INIT(&cpu->work_list);
     QTAILQ_INIT(&cpu->breakpoints);
     QTAILQ_INIT(&cpu->watchpoints);

     cpu_exec_initfn(cpu);

     /*
      * Plugin initialization must wait until the cpu start executing
      * code, but we must queue this work before the threads are
      * created to ensure we don't race.
      */
 #ifdef CONFIG_PLUGIN
     if (tcg_enabled()) {
         cpu->plugin_state = qemu_plugin_create_vcpu_state();
         qemu_plugin_vcpu_init_hook(cpu);
     }
 #endif
 }

 static void cpu_common_finalize(Object *obj)
 {
     CPUState *cpu = CPU(obj);

 #ifdef CONFIG_PLUGIN
     if (tcg_enabled()) {
         g_free(cpu->plugin_state);
     }
 #endif
     g_array_free(cpu->gdb_regs, TRUE);
     qemu_lockcnt_destroy(&cpu->in_ioctl_lock);
     qemu_mutex_destroy(&cpu->work_mutex);
     qemu_cond_destroy(cpu->halt_cond);
     g_free(cpu->halt_cond);
     g_free(cpu->thread);
 }

 static int64_t cpu_common_get_arch_id(CPUState *cpu)
 {
     return cpu->cpu_index;
 }

 static void cpu_common_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     ResettableClass *rc = RESETTABLE_CLASS(klass);
     CPUClass *k = CPU_CLASS(klass);

     k->parse_features = cpu_common_parse_features;
     k->get_arch_id = cpu_common_get_arch_id;
     k->has_work = cpu_common_has_work;
     k->gdb_read_register = cpu_common_gdb_read_register;
     k->gdb_write_register = cpu_common_gdb_write_register;
     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
     dc->realize = cpu_common_realizefn;
     dc->unrealize = cpu_common_unrealizefn;
     rc->phases.hold = cpu_common_reset_hold;
     cpu_class_init_props(dc);
     /*
      * Reason: CPUs still need special care by board code: wiring up
      * IRQs, adding reset handlers, halting non-first CPUs, ...
      */
     dc->user_creatable = false;
 }

 static const TypeInfo cpu_type_info = {
     .name = TYPE_CPU,
     .parent = TYPE_DEVICE,
     .instance_size = sizeof(CPUState),
     .instance_init = cpu_common_initfn,
     .instance_finalize = cpu_common_finalize,
     .abstract = true,
     .class_size = sizeof(CPUClass),
     .class_init = cpu_common_class_init,
 };

 static void cpu_register_types(void)
 {
     type_register_static(&cpu_type_info);
 }

 type_init(cpu_register_types)
	/*
	* QEMU CPU model
	*
	* Copyright (c) 2012-2014 SUSE LINUX Products GmbH
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see
	* <http://www.gnu.org/licenses/gpl-2.0.html>
	*/

	#include "qemu/osdep.h"
	#include "qapi/error.h"
	#include "hw/core/cpu.h"
	#include "sysemu/hw_accel.h"
	#include "qemu/log.h"
	#include "qemu/main-loop.h"
	#include "exec/log.h"
	#include "exec/gdbstub.h"
	#include "sysemu/tcg.h"
	#include "hw/boards.h"
	#include "hw/qdev-properties.h"
	#include "trace.h"
	#ifdef CONFIG_PLUGIN
	#include "qemu/plugin.h"
	#endif

	CPUState *cpu_by_arch_id(int64_t id)
	{
	CPUState *cpu;

	CPU_FOREACH(cpu) {
	CPUClass *cc = CPU_GET_CLASS(cpu);

	if (cc->get_arch_id(cpu) == id) {
	return cpu;
	}
	}
	return NULL;
	}

	bool cpu_exists(int64_t id)
	{
	return !!cpu_by_arch_id(id);
	}

	CPUState cpu_create(const char typename)
	{
	Error *err = NULL;
	CPUState *cpu = CPU(object_new(typename));
	if (!qdev_realize(DEVICE(cpu), NULL, &err)) {
	error_report_err(err);
	object_unref(OBJECT(cpu));
	exit(EXIT_FAILURE);
	}
	return cpu;
	}

	/* Resetting the IRQ comes from across the code base so we take the
	* BQL here if we need to. cpu_interrupt assumes it is held.*/
	void cpu_reset_interrupt(CPUState *cpu, int mask)
	{
	bool need_lock = !bql_locked();

	if (need_lock) {
	bql_lock();
	}
	cpu->interrupt_request &= ~mask;
	if (need_lock) {
	bql_unlock();
	}
	}

	void cpu_exit(CPUState *cpu)
	{
	qatomic_set(&cpu->exit_request, 1);
	/* Ensure cpu_exec will see the exit request after TCG has exited. */
	smp_wmb();
	qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
	}

	static int cpu_common_gdb_read_register(CPUState cpu, GByteArray buf, int reg)
	{
	return 0;
	}

	static int cpu_common_gdb_write_register(CPUState cpu, uint8_t buf, int reg)
	{
	return 0;
	}

	void cpu_dump_state(CPUState cpu, FILE f, int flags)
	{
	CPUClass *cc = CPU_GET_CLASS(cpu);

	if (cc->dump_state) {
	cpu_synchronize_state(cpu);
	cc->dump_state(cpu, f, flags);
	}
	}

	void cpu_reset(CPUState *cpu)
	{
	device_cold_reset(DEVICE(cpu));

	trace_cpu_reset(cpu->cpu_index);
	}

	static void cpu_common_reset_hold(Object *obj, ResetType type)
	{
	CPUState *cpu = CPU(obj);
	CPUClass *cc = CPU_GET_CLASS(cpu);

	if (qemu_loglevel_mask(CPU_LOG_RESET)) {
	qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
	log_cpu_state(cpu, cc->reset_dump_flags);
	}

	cpu->interrupt_request = 0;
	cpu->halted = cpu->start_powered_off;
	cpu->mem_io_pc = 0;
	cpu->icount_extra = 0;
	qatomic_set(&cpu->neg.icount_decr.u32, 0);
	cpu->neg.can_do_io = true;
	cpu->exception_index = -1;
	cpu->crash_occurred = false;
	cpu->cflags_next_tb = -1;

	cpu_exec_reset_hold(cpu);
	}

	static bool cpu_common_has_work(CPUState *cs)
	{
	return false;
	}

	ObjectClass cpu_class_by_name(const char typename, const char *cpu_model)
	{
	ObjectClass *oc;
	CPUClass *cc;

	oc = object_class_by_name(typename);
	cc = CPU_CLASS(oc);
	assert(cc->class_by_name);
	assert(cpu_model);
	oc = cc->class_by_name(cpu_model);
	if (object_class_dynamic_cast(oc, typename) &&
	!object_class_is_abstract(oc)) {
	return oc;
	}

	return NULL;
	}

	static void cpu_common_parse_features(const char typename, char features,
	Error **errp)
	{
	char *val;
	static bool cpu_globals_initialized;
	/* Single "key=value" string being parsed */
	char *featurestr = features ? strtok(features, ",") : NULL;

	/* should be called only once, catch invalid users */
	assert(!cpu_globals_initialized);
	cpu_globals_initialized = true;

	while (featurestr) {
	val = strchr(featurestr, '=');
	if (val) {
	GlobalProperty prop = g_new0(typeof(prop), 1);
	*val = 0;
	val++;
	prop->driver = typename;
	prop->property = g_strdup(featurestr);
	prop->value = g_strdup(val);
	qdev_prop_register_global(prop);
	} else {
	error_setg(errp, "Expected key=value format, found %s.",
	featurestr);
	return;
	}
	featurestr = strtok(NULL, ",");
	}
	}

	static void cpu_common_realizefn(DeviceState dev, Error *errp)
	{
	CPUState *cpu = CPU(dev);
	Object *machine = qdev_get_machine();

	/* qdev_get_machine() can return something that's not TYPE_MACHINE
	* if this is one of the user-only emulators; in that case there's
	* no need to check the ignore_memory_transaction_failures board flag.
	*/
	if (object_dynamic_cast(machine, TYPE_MACHINE)) {
	MachineClass *mc = MACHINE_GET_CLASS(machine);

	if (mc) {
	cpu->ignore_memory_transaction_failures =
	mc->ignore_memory_transaction_failures;
	}
	}

	if (dev->hotplugged) {
	cpu_synchronize_post_init(cpu);
	cpu_resume(cpu);
	}

	/* NOTE: latest generic point where the cpu is fully realized */
	}

	static void cpu_common_unrealizefn(DeviceState *dev)
	{
	CPUState *cpu = CPU(dev);

	/* Call the plugin hook before clearing the cpu is fully unrealized */
	#ifdef CONFIG_PLUGIN
	if (tcg_enabled()) {
	qemu_plugin_vcpu_exit_hook(cpu);
	}
	#endif

	/* NOTE: latest generic point before the cpu is fully unrealized */
	cpu_exec_unrealizefn(cpu);
	}

	static void cpu_common_initfn(Object *obj)
	{
	CPUState *cpu = CPU(obj);

	gdb_init_cpu(cpu);
	cpu->cpu_index = UNASSIGNED_CPU_INDEX;
	cpu->cluster_index = UNASSIGNED_CLUSTER_INDEX;
	/* user-mode doesn't have configurable SMP topology */
	/* the default value is changed by qemu_init_vcpu() for system-mode */
	cpu->nr_cores = 1;
	cpu->nr_threads = 1;
	cpu->cflags_next_tb = -1;

	/* allocate storage for thread info, initialise condition variables */
	cpu->thread = g_new0(QemuThread, 1);
	cpu->halt_cond = g_new0(QemuCond, 1);
	qemu_cond_init(cpu->halt_cond);

	qemu_mutex_init(&cpu->work_mutex);
	qemu_lockcnt_init(&cpu->in_ioctl_lock);
	QSIMPLEQ_INIT(&cpu->work_list);
	QTAILQ_INIT(&cpu->breakpoints);
	QTAILQ_INIT(&cpu->watchpoints);

	cpu_exec_initfn(cpu);

	/*
	* Plugin initialization must wait until the cpu start executing
	* code, but we must queue this work before the threads are
	* created to ensure we don't race.
	*/
	#ifdef CONFIG_PLUGIN
	if (tcg_enabled()) {
	cpu->plugin_state = qemu_plugin_create_vcpu_state();
	qemu_plugin_vcpu_init_hook(cpu);
	}
	#endif
	}

	static void cpu_common_finalize(Object *obj)
	{
	CPUState *cpu = CPU(obj);

	#ifdef CONFIG_PLUGIN
	if (tcg_enabled()) {
	g_free(cpu->plugin_state);
	}
	#endif
	g_array_free(cpu->gdb_regs, TRUE);
	qemu_lockcnt_destroy(&cpu->in_ioctl_lock);
	qemu_mutex_destroy(&cpu->work_mutex);
	qemu_cond_destroy(cpu->halt_cond);
	g_free(cpu->halt_cond);
	g_free(cpu->thread);
	}

	static int64_t cpu_common_get_arch_id(CPUState *cpu)
	{
	return cpu->cpu_index;
	}

	static void cpu_common_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	ResettableClass *rc = RESETTABLE_CLASS(klass);
	CPUClass *k = CPU_CLASS(klass);

	k->parse_features = cpu_common_parse_features;
	k->get_arch_id = cpu_common_get_arch_id;
	k->has_work = cpu_common_has_work;
	k->gdb_read_register = cpu_common_gdb_read_register;
	k->gdb_write_register = cpu_common_gdb_write_register;
	set_bit(DEVICE_CATEGORY_CPU, dc->categories);
	dc->realize = cpu_common_realizefn;
	dc->unrealize = cpu_common_unrealizefn;
	rc->phases.hold = cpu_common_reset_hold;
	cpu_class_init_props(dc);
	/*
	* Reason: CPUs still need special care by board code: wiring up
	* IRQs, adding reset handlers, halting non-first CPUs, ...
	*/
	dc->user_creatable = false;
	}

	static const TypeInfo cpu_type_info = {
	.name = TYPE_CPU,
	.parent = TYPE_DEVICE,
	.instance_size = sizeof(CPUState),
	.instance_init = cpu_common_initfn,
	.instance_finalize = cpu_common_finalize,
	.abstract = true,
	.class_size = sizeof(CPUClass),
	.class_init = cpu_common_class_init,
	};

	static void cpu_register_types(void)
	{
	type_register_static(&cpu_type_info);
	}

	type_init(cpu_register_types)