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Clarify hardpps() parameter name and comment

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Since 32c203577a5e by phk in 1999 (Make even more of the PPSAPI
implementations generic), the "nsec" parameter of hardpps() is a time
difference and no longer a time point.  Change the name to "delta_nsec"
and adjust the comment.

Remove comment about a clock tick adjustment which is no longer in the code.

Pull Request: https://github.com/freebsd/freebsd-src/pull/640
Reviewed by: imp
This commit is contained in:
Sebastian Huber
2023-01-25 13:43:11 +01:00
parent 2bac3364d2
commit aff6af106d
1 changed files with 5 additions and 8 deletions
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13
cpukit/score/src/kern_ntptime.c
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@@ -862,11 +862,11 @@ hardupdate(offset)
* variables, except for the actual time and frequency variables, which * variables, except for the actual time and frequency variables, which
* are determined by this routine and updated atomically. * are determined by this routine and updated atomically.
* *
* tsp - time at PPS * tsp - time at current PPS event
* nsec - hardware counter at PPS * delta_nsec - time elapsed between the previous and current PPS event
*/ */
void void
hardpps(struct timespec *tsp, long nsec) hardpps(struct timespec *tsp, long delta_nsec)
{ {
long u_sec, u_nsec, v_nsec; /* temps */ long u_sec, u_nsec, v_nsec; /* temps */
l_fp ftemp; l_fp ftemp;
@@ -903,12 +903,9 @@ hardpps(struct timespec *tsp, long nsec)
/* /*
* Compute the difference between the current and previous * Compute the difference between the current and previous
* counter values. If the difference exceeds 0.5 s, assume it * counter values. If the difference exceeds 0.5 s, assume it
* has wrapped around, so correct 1.0 s. If the result exceeds * has wrapped around, so correct 1.0 s.
* the tick interval, the sample point has crossed a tick
* boundary during the last second, so correct the tick. Very
* intricate.
*/ */
u_nsec = nsec; u_nsec = delta_nsec;
if (u_nsec > (NANOSECOND >> 1)) if (u_nsec > (NANOSECOND >> 1))
u_nsec -= NANOSECOND; u_nsec -= NANOSECOND;
else if (u_nsec < -(NANOSECOND >> 1)) else if (u_nsec < -(NANOSECOND >> 1))