blob: bf1a7b88923bbed23189f5347d8988990103f346 [file] [log] [blame]
/*
* 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, ",");
}
}
#ifdef CONFIG_PLUGIN
static void qemu_plugin_vcpu_init__async(CPUState *cpu, run_on_cpu_data unused)
{
qemu_plugin_vcpu_init_hook(cpu);
}
#endif
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();
async_run_on_cpu(cpu, qemu_plugin_vcpu_init__async, RUN_ON_CPU_NULL);
}
#endif
}
static void cpu_common_finalize(Object *obj)
{
CPUState *cpu = CPU(obj);
g_array_free(cpu->gdb_regs, TRUE);
qemu_lockcnt_destroy(&cpu->in_ioctl_lock);
qemu_mutex_destroy(&cpu->work_mutex);
}
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)