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| author | wollman <wollman@FreeBSD.org> | 1994-09-18 20:40:01 +0000 |
|---|---|---|
| committer | wollman <wollman@FreeBSD.org> | 1994-09-18 20:40:01 +0000 |
| commit | 9028bd50ffd972e1a3b8145652ee9287ebd2f680 (patch) | |
| tree | 0542820657279835e2be295c7ffed111332b0a03 /sys/kern/kern_sysctl.c | |
| parent | 5de9aa67de26f3a6ec87731670b4bd6c04d312c3 (diff) | |
| download | FreeBSD-src-9028bd50ffd972e1a3b8145652ee9287ebd2f680.zip FreeBSD-src-9028bd50ffd972e1a3b8145652ee9287ebd2f680.tar.gz | |
Redo Kernel NTP PLL support, kernel side.
This code is mostly taken from the 1.1 port (which was in turn taken from
Dave Mills's kern.tar.Z example). A few significant differences:
1) ntp_gettime() is now a MIB variable rather than a system call. A few
fiddles are done in libc to make it behave the same.
2) mono_time does not participate in the PLL adjustments.
3) A new interface has been defined (in <machine/clock.h>) for doing
possibly machine-dependent things around the time of the clock update.
This is used in Pentium kernels to disable interrupts, set `time', and
reset the CPU cycle counter as quickly as possible to avoid jitter in
microtime(). Measurements show an apparent resolution of a bit more than
8.14usec, which is reasonable given system-call overhead.
Diffstat (limited to 'sys/kern/kern_sysctl.c')
| -rw-r--r-- | sys/kern/kern_sysctl.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/sys/kern/kern_sysctl.c b/sys/kern/kern_sysctl.c index 9911879..457734d 100644 --- a/sys/kern/kern_sysctl.c +++ b/sys/kern/kern_sysctl.c @@ -34,7 +34,7 @@ * SUCH DAMAGE. * * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 - * $Id: kern_sysctl.c,v 1.10 1994/09/14 23:21:00 ache Exp $ + * $Id: kern_sysctl.c,v 1.11 1994/09/16 00:53:58 ache Exp $ */ /* @@ -64,6 +64,7 @@ extern sysctlfn vm_sysctl; extern sysctlfn fs_sysctl; extern sysctlfn net_sysctl; extern sysctlfn cpu_sysctl; +extern sysctlfn ntp_sysctl; /* * Locking and stats @@ -201,7 +202,8 @@ kern_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) extern char ostype[], osrelease[]; /* all sysctl names at this level are terminal */ - if (namelen != 1 && !(name[0] == KERN_PROC || name[0] == KERN_PROF)) + if (namelen != 1 && !(name[0] == KERN_PROC || name[0] == KERN_PROF + || name[0] == KERN_NTP_PLL)) return (ENOTDIR); /* overloaded */ switch (name[0]) { @@ -289,6 +291,9 @@ kern_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) #else return (sysctl_rdint(oldp, oldlenp, newp, 0)); #endif + case KERN_NTP_PLL: + return (ntp_sysctl(name + 1, namelen - 1, oldp, oldlenp, + newp, newlen, p)); default: return (EOPNOTSUPP); } |
