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after testing go32 and cvme961

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This commit is contained in:
Joel Sherrill
1995-07-21 20:10:49 +00:00
parent 9e738b65b0
commit 1690c6b636
8 changed files with 38 additions and 21 deletions
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11
c/src/lib/libbsp/i386/go32/timer/timer.c
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@@ -40,6 +40,9 @@ static void restore_timer( void )
}
#else /* pentium */
rtems_isr timerisr();
#define TIMER_ISR_US 10000
#endif /* pentium */
void Timer_initialize()
@@ -74,10 +77,10 @@ void Timer_initialize()
/* Wait for ISR to be called at least once */
WAIT();
/* load timer for 250 microsecond period */
/* load timer for TIMER_ISR_US microsecond period */
outport_byte( TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN );
outport_byte( TIMER_CNTR0, US_TO_TICK(250) >> 0 & 0xff);
outport_byte( TIMER_CNTR0, US_TO_TICK(250) >> 8 & 0xff);
outport_byte( TIMER_CNTR0, US_TO_TICK(TIMER_ISR_US) >> 0 & 0xff);
outport_byte( TIMER_CNTR0, US_TO_TICK(TIMER_ISR_US) >> 8 & 0xff);
}
/* Wait for ISR to be called at least once */
@@ -101,7 +104,7 @@ int Read_timer()
inport_byte( TIMER_CNTR0, lsb );
inport_byte( TIMER_CNTR0, msb );
clicks = msb << 8 | lsb;
total = Ttimer_val + (250 - TICK_TO_US( clicks ));
total = (Ttimer_val * TIMER_ISR_US) + (TIMER_ISR_US - TICK_TO_US( clicks ));
#endif /* pentium */
if ( Timer_driver_Find_average_overhead == 1 )

2
c/src/lib/libbsp/i386/go32/timer/timerisr.s
View File

@@ -27,7 +27,7 @@
PUBLIC(timerisr)
SYM (timerisr):
addl $250,_Ttimer_val # another 250 microseconds
addl $1,_Ttimer_val # another tick
push edx
push eax
movw $0x20,dx