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Sync with sys/i386/i386/microtime.s revision up to 1.39.

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This commit is contained in:
KATO Takenori 1997-12-29 16:17:09 +00:00
parent 3b6f48e947
commit e664869506
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=32091
1 changed files with 7 additions and 10 deletions
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17
sys/pc98/i386/microtime.s
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@ -32,7 +32,7 @@
* SUCH DAMAGE.
*
* from: Steve McCanne's microtime code
* $Id: microtime.s,v 1.20 1997/12/26 20:42:33 phk Exp $
* $Id: microtime.s,v 1.21 1997/12/28 08:16:28 kato Exp $
*/
#include <machine/asmacros.h>
@ -51,7 +51,6 @@
ENTRY(microtime)
#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
movl _tsc_freq, %ecx
testl %ecx, %ecx
je i8254_microtime
@ -61,12 +60,9 @@ ENTRY(microtime)
subl _tsc_bias, %eax
mull _tsc_multiplier
movl %edx, %eax
popfl /* restore interrupt mask */
jmp common_microtime
#else
xorl %ecx, %ecx /* clear ecx */
#endif
ALIGN_TEXT
i8254_microtime:
movb $TIMER_SEL0|TIMER_LATCH, %al /* prepare to latch */
@ -270,10 +266,6 @@ overflow:
shr $15, %eax
#endif /* PC98 */
common_microtime:
addl _time+4, %eax /* usec += time.tv_sec */
movl _time, %edx /* sec = time.tv_sec */
#ifdef USE_CLOCKLOCK
pushl %eax /* s_lock destroys %eax, %ecx */
pushl %edx /* during profiling, %edx is also destroyed */
@ -285,6 +277,11 @@ common_microtime:
#endif /* USE_CLOCKLOCK */
popfl /* restore interrupt mask */
common_microtime:
addl _time+4, %eax /* usec += time.tv_sec */
movl _time, %edx /* sec = time.tv_sec */
cmpl $1000000, %eax /* usec valid? */
jb 1f
subl $1000000, %eax /* adjust usec */