feat: Added NetBSD man pages

1 files changed, 152 insertions, 0 deletions

diff --git a/static/netbsd/man9/man9.x86/tsc.9 b/static/netbsd/man9/man9.x86/tsc.9
new file mode 100644
index 00000000..31d255dc
--- /dev/null
+++ b/static/netbsd/man9/man9.x86/tsc.9
@@ -0,0 +1,152 @@
+.\" $NetBSD: tsc.9,v 1.8 2017/02/19 11:54:59 wiz Exp $
+.\"
+.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jukka Ruohonen.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd February 17, 2017
+.Dt TSC 9 x86
+.Os
+.Sh NAME
+.Nm tsc
+.Nd Time Stamp Counter
+.Sh SYNOPSIS
+.In x86/x86/tsc.h
+.Ft uint64_t
+.Fn rdtsc "void"
+.Ft void
+.Fn tsc_tc_init "void"
+.Ft void
+.Fn tsc_sync_ap "struct cpu_info *ci"
+.Ft void
+.Fn tsc_sync_bp "struct cpu_info *ci"
+.Ft void
+.Fn tsc_sync_drift "int64_t drift"
+.Sh DESCRIPTION
+The time stamp counter
+.Pq Tn TSC
+is a hardware counter found in all contemporary x86 processors.
+The counter is implemented as a 64-bit model-specific register
+.Pq Tn MSR
+that is incremented at every clock cycle.
+The
+.Tn RDTSC
+.Pq Dq read time stamp counter
+register has been present since the original Pentium.
+.Pp
+Already because of the access method,
+.Tn TSC
+provides a low-overhead and high-resolution
+way to obtain
+.Tn CPU
+timing information.
+This traditional premise was violated when such factors as
+system sleep states,
+.Tn CPU
+.Dq hotplugging ,
+.Dq hibernation ,
+and
+.Tn CPU
+frequency scaling
+were introduced to the x86 lineage.
+This was however mainly a short abruption:
+in many new x86
+.Tn CPUs
+the time stamp counter is again invariant with
+respect to the stability of the clock frequency.
+Care should be however taken in implementations that rely on this assumption.
+.Sh FUNCTIONS
+.Bl -tag -width abcd
+.It Fn rdtsc ""
+The
+.Fn rdtsc
+function returns the value read from
+.Dv RDTSC .
+.It Fn tsc_tc_init ""
+The
+.Fn tsc_tc_init
+function initializes the
+.Tn TSC
+as a
+.Xr timecounter 9 .
+The function is called early in the boot process when the processors attach.
+.It Fn tsc_sync_bp "ci"
+The
+.Fn tsc_sync_bp
+function synchronizes the counter for the boot processor
+.Pq Tn BP .
+The supplied
+.Fa ci
+must refer to the
+.Tn BP
+itself.
+The
+.Nm
+interface takes internally care of such issues as out-of-order execution,
+where instructions are not necessarily performed in the order of execution,
+possibly causing a misleading cycle count.
+.It Fn tsc_sync_ap "ci"
+The
+.Fn tsc_sync_ap
+function synchronize the counter for the application processor
+.Fa ci .
+Interrupts must be off at machine-level when the function is called.
+.Pp
+It is necessary to call both
+.Fn tsc_sync_ap
+and
+.Fn tsc_sync_bp
+during the boot, but additional synchronization
+may be required also during runtime.
+As an example, the
+.Tn TSC
+needs to be synchronized for all processors when the system resumes from an
+.Xr acpi 4
+sleep state.
+.It Fn tsc_sync_drift "drift"
+Finally, the
+.Fn tsc_sync_drift
+function records
+.Fa drift ,
+measured in clock cycles.
+This is called when the
+.Tn APs
+attach.
+.El
+.\"
+.\" Some references that are not worth adding to the actual page:
+.\"
+.\" http://lwn.net/Articles/209101/
+.\" http://lwn.net/Articles/388188/
+.\" http://lkml.org/lkml/2005/11/4/173
+.\" http://www.ccsl.carleton.ca/~jamuir/rdtscpm1.pdf
+.\"
+.Sh SEE ALSO
+.Xr gettimeofday 2 ,
+.Xr hpet 4 ,
+.Xr hz 9 ,
+.Xr timecounter 9 ,
+.Xr x86/rdmsr 9