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;
}
/*
* 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;
}
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;
}
