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- Use HZ mechanism.

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Pointed out by Perry E. Metzger <perry@piermont.com> on port-x68k.
- Correct microtime() value.
This commit is contained in:
isaki 2002-07-13 05:55:26 +00:00
parent 7d85789f0a
commit b35fcc7d5a
1 changed files with 18 additions and 7 deletions
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25
sys/arch/x68k/x68k/clock.c
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@ -1,4 +1,4 @@
/* $NetBSD: clock.c,v 1.11 2001/03/15 06:10:53 chs Exp $ */
/* $NetBSD: clock.c,v 1.12 2002/07/13 05:55:26 isaki Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -98,10 +98,14 @@ clock_attach(parent, self, aux)
}
/* We're using a 100 Hz clock. */
/*
* MFP of X68k uses 4MHz clock always and we use 1/200 prescaler here.
* Therefore, clock interval is 50 usec.
*/
#define CLK_RESOLUTION (50)
#define CLOCKS_PER_SEC (1000000 / CLK_RESOLUTION)
#define CLK_INTERVAL 200
#define CLOCKS_PER_SEC 100
static int clkint; /* clock interval */
static int clkread __P((void));
@ -130,10 +134,17 @@ static int clkread __P((void));
void
cpu_initclocks()
{
mfp_set_tcdcr(mfp_get_tcdcr() & 0x0f); /* stop timer C */
mfp_set_tcdr(CLK_INTERVAL);
if (CLOCKS_PER_SEC % hz ||
hz <= (CLOCKS_PER_SEC / 256) || hz > CLOCKS_PER_SEC) {
printf("cannot set %d Hz clock. using 100 Hz\n", hz);
hz = 100;
}
clkint = CLOCKS_PER_SEC / hz;
mfp_set_tcdcr(mfp_get_tcdcr() & 0x0f); /* stop timer C */
mfp_set_tcdcr(mfp_get_tcdcr() | 0x70); /* 1/200 delay mode */
mfp_set_tcdr(clkint);
mfp_bit_set_ierb(MFP_INTR_TIMER_C);
}
@ -155,7 +166,7 @@ setstatclockrate(hz)
int
clkread()
{
return (mfp_get_tcdr() * CLOCKS_PER_SEC) / CLK_INTERVAL;
return (clkint - mfp_get_tcdr()) * CLK_RESOLUTION;
}