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2010-03-10 Gedare Bloom <gedare@gwu.edu>

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PR 1495/bsp
	* clock/ckinit.c: Calling rtems_clock_get_uptime() in a tight loop
	sometimes showed time moving backwards.
This commit is contained in:
Joel Sherrill
2010-03-10 17:16:11 +00:00
parent 4f112b821a
commit f1c5a5228f
2 changed files with 22 additions and 0 deletions
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6
c/src/lib/libbsp/i386/pc386/ChangeLog
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@@ -1,3 +1,9 @@
2010-03-10 Gedare Bloom <gedare@gwu.edu>
PR 1495/bsp
* clock/ckinit.c: Calling rtems_clock_get_uptime() in a tight loop
sometimes showed time moving backwards.
2009-09-15 Till Straumann <strauman@slac.stanford.edu> 2009-09-15 Till Straumann <strauman@slac.stanford.edu>
PR 1344/bsps: PR 1344/bsps:

16
c/src/lib/libbsp/i386/pc386/clock/ckinit.c
View File

@@ -47,6 +47,11 @@ uint64_t pc586_tsc_at_tick;
/* this driver may need to count ISRs per tick */ /* this driver may need to count ISRs per tick */
#define CLOCK_DRIVER_ISRS_PER_TICK pc386_isrs_per_tick #define CLOCK_DRIVER_ISRS_PER_TICK pc386_isrs_per_tick
/* if so, the driver may use the count in Clock_driver_support_at_tick */
#ifdef CLOCK_DRIVER_ISRS_PER_TICK
extern volatile uint32_t Clock_driver_isrs;
#endif
#define READ_8254( _lsb, _msb ) \ #define READ_8254( _lsb, _msb ) \
do { outport_byte(TIMER_MODE, TIMER_SEL0|TIMER_LATCH); \ do { outport_byte(TIMER_MODE, TIMER_SEL0|TIMER_LATCH); \
inport_byte(TIMER_CNTR0, _lsb); \ inport_byte(TIMER_CNTR0, _lsb); \
@@ -66,7 +71,18 @@ uint32_t (*Clock_driver_nanoseconds_since_last_tick)(void) = NULL;
*/ */
void Clock_driver_support_at_tick_tsc(void) void Clock_driver_support_at_tick_tsc(void)
{ {
#ifdef CLOCK_DRIVER_ISRS_PER_TICK
/*
* The driver is multiple ISRs per clock tick.
*/
if (!Clock_driver_isrs)
pc586_tsc_at_tick = rdtsc();
#else
/*
* The driver is one ISR per clock tick.
*/
pc586_tsc_at_tick = rdtsc(); pc586_tsc_at_tick = rdtsc();
#endif
} }
void Clock_driver_support_at_tick_empty(void) void Clock_driver_support_at_tick_empty(void)