コード例 #1
0
ファイル: jitterentropy-kcapi.c プロジェクト: DenisLug/mptcp
void jent_get_nstime(__u64 *out)
{
	struct timespec ts;
	__u64 tmp = 0;

	tmp = random_get_entropy();

	/*
	 * If random_get_entropy does not return a value (which is possible on,
	 * for example, MIPS), invoke __getnstimeofday
	 * hoping that there are timers we can work with.
	 *
	 * The list of available timers can be obtained from
	 * /sys/devices/system/clocksource/clocksource0/available_clocksource
	 * and are registered with clocksource_register()
	 */
	if ((0 == tmp) &&
	   (0 == __getnstimeofday(&ts))) {
		tmp = ts.tv_sec;
		tmp = tmp << 32;
		tmp = tmp | ts.tv_nsec;
	}

	*out = tmp;
}
コード例 #2
0
ファイル: jitterentropy-kcapi.c プロジェクト: ChineseDr/linux
/*
 * Obtain a high-resolution time stamp value. The time stamp is used to measure
 * the execution time of a given code path and its variations. Hence, the time
 * stamp must have a sufficiently high resolution.
 *
 * Note, if the function returns zero because a given architecture does not
 * implement a high-resolution time stamp, the RNG code's runtime test
 * will detect it and will not produce output.
 */
void jent_get_nstime(__u64 *out)
{
    __u64 tmp = 0;

    tmp = random_get_entropy();

    /*
     * If random_get_entropy does not return a value, i.e. it is not
     * implemented for a given architecture, use a clock source.
     * hoping that there are timers we can work with.
     */
    if (tmp == 0)
        tmp = ktime_get_ns();

    *out = tmp;
}
コード例 #3
0
ファイル: jitterentropy-kcapi.c プロジェクト: 0-T-0/ps4-linux
void jent_get_nstime(__u64 *out)
{
	struct timespec ts;
	__u64 tmp = 0;

	tmp = random_get_entropy();

	/*
	 * If random_get_entropy does not return a value (which is possible on,
	 * for example, MIPS), invoke __getnstimeofday
	 * hoping that there are timers we can work with.
	 */
	if ((0 == tmp) &&
	   (0 == __getnstimeofday(&ts))) {
		tmp = ts.tv_sec;
		tmp = tmp << 32;
		tmp = tmp | ts.tv_nsec;
	}

	*out = tmp;
}