/*
 * QEMU System Emulator, accelerator interfaces
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 * Copyright (c) 2014 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "sysemu/accel.h"
#include "sysemu/tcg.h"
#include "qom/object.h"
#include "cpu.h"
#include "sysemu/cpus.h"
#include "qemu/main-loop.h"

unsigned long tcg_tb_size;

/* mask must never be zero, except for A20 change call */
static void tcg_handle_interrupt(CPUState *cpu, int mask)
{
    int old_mask;
    g_assert(qemu_mutex_iothread_locked());

    old_mask = cpu->interrupt_request;
    cpu->interrupt_request |= mask;

    /*
     * If called from iothread context, wake the target cpu in
     * case its halted.
     */
    if (!qemu_cpu_is_self(cpu)) {
        qemu_cpu_kick(cpu);
    } else {
        atomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
        if (use_icount &&
            !cpu->can_do_io
            && (mask & ~old_mask) != 0) {
            cpu_abort(cpu, "Raised interrupt while not in I/O function");
        }
    }
}

static int tcg_init(MachineState *ms)
{
    tcg_exec_init(tcg_tb_size * 1024 * 1024);
    cpu_interrupt_handler = tcg_handle_interrupt;
    return 0;
}

static void tcg_accel_class_init(ObjectClass *oc, void *data)
{
    AccelClass *ac = ACCEL_CLASS(oc);
    ac->name = "tcg";
    ac->init_machine = tcg_init;
    ac->allowed = &tcg_allowed;
}

#define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")

static const TypeInfo tcg_accel_type = {
    .name = TYPE_TCG_ACCEL,
    .parent = TYPE_ACCEL,
    .class_init = tcg_accel_class_init,
};

static void register_accel_types(void)
{
    type_register_static(&tcg_accel_type);
}

type_init(register_accel_types);