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MFamd64 rev 1.223: Use the TSC to implement DELAY() if not marked broken

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and it has been calibrated.
This commit is contained in:
Peter Wemm 2005-12-13 19:08:55 +00:00
parent e83f6bcb75
commit 737429bc96
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=153384
2 changed files with 30 additions and 0 deletions
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15
sys/i386/isa/clock.c
View File

@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/module.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#include <sys/cons.h>
#include <sys/power.h>
@ -288,7 +289,21 @@ DELAY(int n)
int getit_calls = 1;
int n1;
static int state = 0;
#endif
if (tsc_freq != 0 && !tsc_is_broken) {
uint64_t start, end, now;
sched_pin();
start = rdtsc();
end = start + (tsc_freq * n) / 1000000;
do {
now = rdtsc();
} while (now < end || (now > start && end < start));
sched_unpin();
return;
}
#ifdef DELAYDEBUG
if (state == 0) {
state = 1;
for (n1 = 1; n1 <= 10000000; n1 *= 10)

15
sys/isa/atrtc.c
View File

@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/module.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#include <sys/cons.h>
#include <sys/power.h>
@ -288,7 +289,21 @@ DELAY(int n)
int getit_calls = 1;
int n1;
static int state = 0;
#endif
if (tsc_freq != 0 && !tsc_is_broken) {
uint64_t start, end, now;
sched_pin();
start = rdtsc();
end = start + (tsc_freq * n) / 1000000;
do {
now = rdtsc();
} while (now < end || (now > start && end < start));
sched_unpin();
return;
}
#ifdef DELAYDEBUG
if (state == 0) {
state = 1;
for (n1 = 1; n1 <= 10000000; n1 *= 10)