Date: Thu, 24 May 2001 16:21:16 -0700 (PDT) From: larse@isi.edu To: freebsd-gnats-submit@FreeBSD.org Subject: i386/27627: machdep.tsc_freq does not exists on machines with APM or SMP Message-ID: <200105242321.f4ONLGC99337@freefall.freebsd.org>
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>Number: 27627
>Category: i386
>Synopsis: machdep.tsc_freq does not exists on machines with APM or SMP
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu May 24 16:30:07 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Lars Eggert
>Release: 4.2-RELEASE
>Organization:
>Environment:
FreeBSD e.postel.org 4.2-RELEASE FreeBSD 4.2-RELEASE #6: Thu May 24 15:52:44 PDT 2001 larse@e.postel.org:/usr/src/sys/compile/KERNEL-1.19 i386
>Description:
The machdep.tsc_freq sysctl knob does not exists on systems that have
power management (APM) or SMP enabled. It's the easiest way to query
for probed CPU speed.
The patch below adds a new read-only sysctl know "hw.cpuhz" which is
initialized from tsc_freq at boot time. Since it's read-only, it is
ok to use on SMP and APM-enabled machines.
Please transmogrify the patch as needed for inclusion in the tree.
>How-To-Repeat:
>Fix:
--- /usr/src/sys/i386/isa/clock.c Wed Aug 2 17:09:29 2000
+++ clock.c Thu May 24 15:57:07 2001
@@ -140,6 +140,9 @@
u_int timer_freq = TIMER_FREQ;
int timer0_max_count;
u_int tsc_freq;
+#ifdef CPUHZ
+static u_int cpuhz = 0;
+#endif
int tsc_is_broken;
int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */
@@ -661,6 +664,9 @@
* similar to those for the i8254 clock.
*/
if (tsc_present)
+#ifdef CPUHZ
+ cpuhz =
+#endif
tsc_freq = rdtsc() - old_tsc;
if (bootverbose) {
@@ -1164,6 +1170,10 @@
SYSCTL_PROC(_machdep, OID_AUTO, i8254_freq, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(u_int), sysctl_machdep_i8254_freq, "I", "");
+
+#ifdef CPUHZ
+SYSCTL_INT(_hw, OID_AUTO, cpuhz, CTLFLAG_RD, &cpuhz, 0, "CPU speed in Hz.");
+#endif
static int
sysctl_machdep_tsc_freq(SYSCTL_HANDLER_ARGS)
>Release-Note:
>Audit-Trail:
>Unformatted:
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