/**
* Get current system time in ticks
*
* linux doesn't provide an easy access to jiffies so implement it by measuring
* the time since the first call to this function.
*
* Since this function is used to seed the (non-cryptographic) random
* number generator, we round the start time down to the nearest whole
* second. This minimises the chances of generating identical RNG
* sequences (and hence identical TCP port numbers, etc) on
* consecutive invocations of iPXE.
*
* @ret ticks Current time, in ticks
*/
static unsigned long linux_currticks(void)
{
static struct timeval start;
static int initialized = 0;
if (! initialized) {
linux_gettimeofday(&start, NULL);
initialized = 1;
}
struct timeval now;
linux_gettimeofday(&now, NULL);
unsigned long ticks = (now.tv_sec - start.tv_sec) * linux_ticks_per_sec();
ticks += now.tv_usec / (long)(1000000 / linux_ticks_per_sec());
return ticks;
}
/**
* Get current time in seconds
*
* @ret time Time, in seconds
*/
static time_t linux_now ( void ) {
struct timeval now;
linux_gettimeofday ( &now, NULL );
return now.tv_sec;
}
