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reintroduce *notsc= option

the issues with the previous tsc change where not related to the tsc
but where problems with timesync using an old frequency file. a
patch to fix timesync was commited, so so we reintroduce the *notsc=
again.

--- a/sys/man/8/plan9.ini

+++ b/sys/man/8/plan9.ini

@@ -730,6 +730,9 @@

 Prints a summary of the multiprocessor APIC interrupt configuration.

 .SS \fL*nomsi=\fP

 Disables message signaled interrupts.

+.SS \fL*notsc=\fP

+Disables the use of the per processor timestamp counter registers

+as high resolution clock.

 .SS \fL*pcimaxbno=value\fP

 This puts a limit on the maximum bus number probed

 on a PCI bus (default 7).

--- a/sys/src/9/pc/archacpi.c

+++ b/sys/src/9/pc/archacpi.c

@@ -519,7 +519,7 @@

 		return 1;

 	if((cp = getconf("*nomp")) != nil && strcmp(cp, "0") != 0)

 		return 1;

-	if(m->havetsc)

+	if(m->havetsc && getconf("*notsc") == nil)

 		archacpi.fastclock = tscticks;

 	return 0;

 }

--- a/sys/src/9/pc/archmp.c

+++ b/sys/src/9/pc/archmp.c

@@ -395,7 +395,7 @@

 		return 1;

 	}

-	if(m->havetsc)

+	if(m->havetsc && getconf("*notsc") == nil)

 		archmp.fastclock = tscticks;

 	return 0;

-- 

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