/*
* set_freq - set clock frequency correction
*
* Used to step the frequency correction at startup, possibly again once
* the frequency is measured (that is, transitioning from EVNT_NSET to
* EVNT_FSET), and finally to switch between daemon and kernel loop
* discipline at runtime.
*
* When the kernel loop discipline is available but the daemon loop is
* in use, the kernel frequency correction is disabled (set to 0) to
* ensure drift_comp is applied by only one of the loops.
*/
static void
set_freq(
double freq /* frequency update */
)
{
const char * loop_desc;
int ntp_adj_ret;
drift_comp = freq;
loop_desc = "ntpd";
#ifdef KERNEL_PLL
if (pll_control) {
ZERO(ntv);
ntv.modes = MOD_FREQUENCY;
if (kern_enable) {
loop_desc = "kernel";
ntv.freq = DTOFREQ(drift_comp);
}
if ((ntp_adj_ret = ntp_adjtime(&ntv)) != 0) {
ntp_adjtime_error_handler(__func__, &ntv, ntp_adj_ret, errno, 0, 0, __LINE__ - 1);
}
}
#endif /* KERNEL_PLL */
mprintf_event(EVNT_FSET, NULL, "%s %.3f PPM", loop_desc,
drift_comp * 1e6);
}
/*
* set_freq - set clock frequency
*/
static void
set_freq(
double freq /* frequency update */
)
{
char tbuf[80];
drift_comp = freq;
#ifdef KERNEL_PLL
/*
* If the kernel is enabled, update the kernel frequency.
*/
if (pll_control && kern_enable) {
memset(&ntv, 0, sizeof(ntv));
ntv.modes = MOD_FREQUENCY;
ntv.freq = DTOFREQ(drift_comp);
ntp_adjtime(&ntv);
snprintf(tbuf, sizeof(tbuf), "kernel %.3f PPM",
drift_comp * 1e6);
report_event(EVNT_FSET, NULL, tbuf);
} else {
snprintf(tbuf, sizeof(tbuf), "ntpd %.3f PPM",
drift_comp * 1e6);
report_event(EVNT_FSET, NULL, tbuf);
}
#else /* KERNEL_PLL */
snprintf(tbuf, sizeof(tbuf), "ntpd %.3f PPM", drift_comp *
1e6);
report_event(EVNT_FSET, NULL, tbuf);
#endif /* KERNEL_PLL */
}
