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The udelay I wrote was busted, now fixed, tested, working on AMD.

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This commit is contained in:
Ronald G. Minnich 2002-07-30 21:44:53 +00:00
parent e9c806ea37
commit 6ccc762393
1 changed files with 6 additions and 11 deletions
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17
src/cpu/p5/delay_tsc.c
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@ -125,21 +125,16 @@ static unsigned long long calibrate_tsc(void)
delta >>= 20;
// save this for microsecond timing.
clocks_per_usec = delta;
#define DEBUG
#ifdef DEBUG
printf("end %x:%x, start %x:%x\n",
printk_notice("end %x:%x, start %x:%x\n",
endhigh, endlow, starthigh, startlow);
printf("32-bit delta %d\n", (unsigned long) delta);
printk_notice("32-bit delta %d\n", (unsigned long) delta);
#endif
// ok now we don't have divide for unsigned long long.
// so what we do is set an unsigned long to all 1's, which is just 1 less than
// 1 << 32. then we divide by an unsigned long version of delta (we now that delta fits
// easily in 32 bits). that way we avoid assembly code.
// avoid gcc complaints.
result = allones / (unsigned long) delta;
retval = result;
retval = clocks_per_usec;
#ifdef DEBUG
printf(__FUNCTION__ " 32-bit result is %d\n", result);
printk_notice(__FUNCTION__ " 32-bit result is %d\n", result);
#endif
return retval;
}
@ -154,7 +149,7 @@ void udelay(unsigned long us)
unsigned long long clocks;
if (!clocks_per_usec) {
clocks_per_usec = calibrate_tsc();
calibrate_tsc();
printk_info("clocks_per_usec: %u\n", clocks_per_usec);
}
clocks = us;