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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-20 12:08:42 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-20 13:52:19 +0200 |
commit | e0dd8a5ad830798bc8082b03b8c42c32fb9660e0 (patch) | |
tree | d147bfc4d670fcdfbd2e2d2e75eb209f92e07df1 /bsps/m68k/mrm332 | |
parent | bsps: Move startup files to bsps (diff) | |
download | rtems-e0dd8a5ad830798bc8082b03b8c42c32fb9660e0.tar.bz2 |
bsps: Move benchmark timer to bsps
This patch is a part of the BSP source reorganization.
Update #3285.
Diffstat (limited to 'bsps/m68k/mrm332')
-rw-r--r-- | bsps/m68k/mrm332/btimer/btimer.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/bsps/m68k/mrm332/btimer/btimer.c b/bsps/m68k/mrm332/btimer/btimer.c new file mode 100644 index 0000000000..8c14f8fe58 --- /dev/null +++ b/bsps/m68k/mrm332/btimer/btimer.c @@ -0,0 +1,60 @@ +/* + * COPYRIGHT (c) 1989-1999. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <bsp.h> +#include <rtems/btimer.h> + +bool benchmark_timer_find_average_overhead; + +extern rtems_isr Clock_isr(void); + +void benchmark_timer_initialize( void ) +{ +} + +/* + * The following controls the behavior of benchmark_timer_read(). + * + * FIND_AVG_OVERHEAD * instructs the routine to return the "raw" count. + * + * AVG_OVEREHAD is the overhead for starting and stopping the timer. It + * is usually deducted from the number returned. + * + * LEAST_VALID is the lowest number this routine should trust. Numbers + * below this are "noise" and zero is returned. + */ + +#define AVG_OVERHEAD 0 /* It typically takes X.X microseconds */ + /* (Y countdowns) to start/stop the timer. */ + /* This value is in microseconds. */ +#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */ + +/* + * Return timer value in 1/2-microsecond units + */ +benchmark_timer_t benchmark_timer_read( void ) +{ + uint32_t total; + total = 0; + + if ( benchmark_timer_find_average_overhead == true ) + return total; /* in XXX microsecond units */ + + if ( total < LEAST_VALID ) + return 0; /* below timer resolution */ + + return (total - AVG_OVERHEAD); +} + +void benchmark_timer_disable_subtracting_average_overhead( + bool find_flag +) +{ + benchmark_timer_find_average_overhead = find_flag; +} |