guesscpuhz(), apm suspend

use fastclock timer (pit2) to measure cpufreq in guesscpuhz(). this
gives a bigger period minimizing the danger of overrun as pit2 runs
at the constant maximum period of 0x10000 ticks. also use smaller
loop increments (1000) and bigger maximum loop upper bound.

move the loops < ... check to the bottom of the loop so we get the
effective count *before* adding the next loop increment.

ilock() while doing measurements in guesscpuhz() to prevent accidents
with other processors reading fastclock or doing guesscpuhz()
in parralel.

export new i8253reset() function for apm to reset the timers after
a apm bios suspend.

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/src/9/pc/fns.h b/sys/src/9/pc/fns.h
index e9e899f03..5024723b2 100644
--- a/sys/src/9/pc/fns.h
+++ b/sys/src/9/pc/fns.h
@@ -54,6 +54,7 @@ void	i8250mouse(char*, int (*)(Queue*, int), int);
 void	i8250setmouseputc(char*, int (*)(Queue*, int));
 void	i8253enable(void);
 void	i8253init(void);
+void	i8253reset(void);
 uvlong	i8253read(uvlong*);
 void	i8253timerset(uvlong);
 int	i8259disable(int);