unicorn/qemu/qemu-timer.c

/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * 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.
 */

/* Modified for Unicorn Engine by Nguyen Anh Quynh, 2015 */

#include "qemu/osdep.h"
#include "sysemu/sysemu.h"

#include "hw/hw.h"

#include "qemu/timer.h"

#ifdef CONFIG_PPOLL
#include <poll.h>
#endif

#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
#include <sys/prctl.h>
#endif

#include "uc_priv.h"

/***********************************************************/
/* timers */

typedef struct QEMUClock {
    /* We rely on BQL to protect the timerlists */
    QLIST_HEAD(, QEMUTimerList) timerlists;

    int64_t last;

    QEMUClockType type;
    bool enabled;
} QEMUClock;

static QEMUClock qemu_clocks[QEMU_CLOCK_MAX];

/**
 * qemu_clock_ptr:
 * @type: type of clock
 *
 * Translate a clock type into a pointer to QEMUClock object.
 *
 * Returns: a pointer to the QEMUClock object
 */
static inline QEMUClock *qemu_clock_ptr(QEMUClockType type)
{
    return &qemu_clocks[type];
}

/* return the host CPU cycle counter and handle stop/restart */
int64_t cpu_get_ticks(void)
{
    return cpu_get_real_ticks();
}

/* return the host CPU monotonic timer and handle stop/restart */
int64_t cpu_get_clock(void)
{
    return get_clock();
}

int64_t qemu_clock_get_ns(QEMUClockType type)
{
    int64_t now, last;
    QEMUClock *clock = qemu_clock_ptr(type);

    switch (type) {
        case QEMU_CLOCK_REALTIME:
            return get_clock();
        default:
        case QEMU_CLOCK_VIRTUAL:
            return cpu_get_clock();
        case QEMU_CLOCK_HOST:
            now = get_clock_realtime();
            last = clock->last;
            clock->last = now;
            if (now < last) {
                // notifier_list_notify(&clock->reset_notifiers, &now); // FIXME
            }
            return now;
    }
}