Date: Fri, 6 Jul 2001 12:38:40 +0300 From: Peter Pentchev <roam@orbitel.bg> To: arch@FreeBSD.org Cc: hardware@FreeBSD.org Subject: New hw.cpuhz sysctl as per PR i386/27627 Message-ID: <20010706123840.A598@ringworld.oblivion.bg>
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Hi,
Attached is a slight modification of the patch in PR i386/27627.
Are there any downsides to implementing this? If not, how should
it be extended to allow probing non-TSC/non-i386 timecounters?
G'luck,
Peter
--
"yields falsehood, when appended to its quotation." yields falsehood, when appended to its quotation.
Index: src/sys/i386/isa/clock.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/isa/clock.c,v
retrieving revision 1.174
diff -u -r1.174 clock.c
--- src/sys/i386/isa/clock.c 2001/05/15 23:22:21 1.174
+++ src/sys/i386/isa/clock.c 2001/07/06 09:11:52
@@ -146,6 +146,10 @@
static u_int32_t i8254_lastcount;
static u_int32_t i8254_offset;
static int i8254_ticked;
+static u_int cpuhz;
+
+SYSCTL_INT(_hw, OID_AUTO, cpuhz, CTLFLAG_RD, &cpuhz, 0, "CPU speed in Hz.");
+
/*
* XXX new_function and timer_func should not handle clockframes, but
* timer_func currently needs to hold hardclock to handle the
@@ -664,7 +668,7 @@
* similar to those for the i8254 clock.
*/
if (tsc_present)
- tsc_freq = rdtsc() - old_tsc;
+ cpuhz = tsc_freq = rdtsc() - old_tsc;
if (bootverbose) {
if (tsc_present)
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