
and the "kernel.tar.Z" distribution on louie.udel.edu, which is older than xntp 3.4y or 3.5a, but contains newer kernel source fragments. This commit adds support for a new kernel configuration option, NTP. If NTP is selected, then the system clock should be run at "HZ", which must be defined at compile time to be one value from: 60, 64, 100, 128, 256, 512, 1024. Powers of 2 are ideal; 60 and 100 are supported but are marginally less accurate. If NTP is not configured, there should be no change in behavior relative to pre-NTP kernels. These changes have been tested extensively with xntpd 3.4y on a decstation; almost identical kernel mods work on an i386. No pulse-per-second (PPS) line discipline support is included, due to unavailability of hardware to test it. With this in-kernel PLL support for NetBSD, both xntp 3.4y and xntp 3.5a user-level code need minor changes. xntp's prototype for syscall() is correct for FreeBSD, but not for NetBSD.
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