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x86: Remove some leftover APM support

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This is obsolete since commit 8c576a279e ("Remove APM BIOS support").

Reviewed by:	imp, kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32510
This commit is contained in:
Mark Johnston 2021-10-16 09:46:43 -04:00
parent 81f2e9063d
commit 06ebadc5f5
1 changed files with 0 additions and 19 deletions
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19
sys/x86/x86/tsc.c
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@ -42,7 +42,6 @@ __FBSDID("$FreeBSD$");
#include <sys/time.h>
#include <sys/timetc.h>
#include <sys/kernel.h>
#include <sys/power.h>
#include <sys/smp.h>
#include <sys/vdso.h>
#include <machine/clock.h>
@ -585,23 +584,6 @@ init_TSC_tc(void)
*/
max_freq = UINT_MAX;
/*
* We can not use the TSC if we support APM. Precise timekeeping
* on an APM'ed machine is at best a fools pursuit, since
* any and all of the time spent in various SMM code can't
* be reliably accounted for. Reading the RTC is your only
* source of reliable time info. The i8254 loses too, of course,
* but we need to have some kind of time...
* We don't know at this point whether APM is going to be used
* or not, nor when it might be activated. Play it safe.
*/
if (power_pm_get_type() == POWER_PM_TYPE_APM) {
tsc_timecounter.tc_quality = -1000;
if (bootverbose)
printf("TSC timecounter disabled: APM enabled.\n");
goto init;
}
/*
* Intel CPUs without a C-state invariant TSC can stop the TSC
* in either C2 or C3. Disable use of C2 and C3 while using
@ -637,7 +619,6 @@ init_TSC_tc(void)
tsc_timecounter.tc_quality = 1000;
max_freq >>= tsc_shift;
init:
for (shift = 0; shift <= 31 && (tsc_freq >> shift) > max_freq; shift++)
;