x86: Remove some leftover APM support
This is obsolete since commit 8c576a279e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
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parent
81f2e9063d
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06ebadc5f5
@ -42,7 +42,6 @@ __FBSDID("$FreeBSD$");
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#include <sys/time.h>
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#include <sys/timetc.h>
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#include <sys/kernel.h>
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#include <sys/power.h>
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#include <sys/smp.h>
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#include <sys/vdso.h>
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#include <machine/clock.h>
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@ -585,23 +584,6 @@ init_TSC_tc(void)
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*/
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max_freq = UINT_MAX;
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/*
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* We can not use the TSC if we support APM. Precise timekeeping
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* on an APM'ed machine is at best a fools pursuit, since
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* any and all of the time spent in various SMM code can't
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* be reliably accounted for. Reading the RTC is your only
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* source of reliable time info. The i8254 loses too, of course,
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* but we need to have some kind of time...
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* We don't know at this point whether APM is going to be used
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* or not, nor when it might be activated. Play it safe.
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*/
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if (power_pm_get_type() == POWER_PM_TYPE_APM) {
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tsc_timecounter.tc_quality = -1000;
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if (bootverbose)
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printf("TSC timecounter disabled: APM enabled.\n");
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goto init;
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}
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/*
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* Intel CPUs without a C-state invariant TSC can stop the TSC
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* in either C2 or C3. Disable use of C2 and C3 while using
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@ -637,7 +619,6 @@ init_TSC_tc(void)
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tsc_timecounter.tc_quality = 1000;
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max_freq >>= tsc_shift;
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init:
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for (shift = 0; shift <= 31 && (tsc_freq >> shift) > max_freq; shift++)
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;
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