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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-06-13 09:44:32 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-06-14 14:20:30 +0200 |
| commit | 50fc8f65a6a7a602720af82af58b453dc663f082 (patch) | |
| tree | e0a50bee793de37d516ad016633c478999cc4e3e | |
| parent | v850 - byte swap instructions not available on all multilibs (diff) | |
| download | rtems-50fc8f65a6a7a602720af82af58b453dc663f082.tar.bz2 | |
sapi: Add nanoseconds_per_tick to configuration
Add nanoseconds_per_tick to rtems_configuration_table. This value will
be derived from the microseconds_per_tick value. This avoids some
calculations at run-time.
| -rw-r--r-- | c/src/lib/libbsp/arm/nds/startup/bspstart.c | 2 | ||||
| -rw-r--r-- | cpukit/sapi/include/confdefs.h | 1 | ||||
| -rw-r--r-- | cpukit/sapi/include/rtems/config.h | 15 |
3 files changed, 16 insertions, 2 deletions
diff --git a/c/src/lib/libbsp/arm/nds/startup/bspstart.c b/c/src/lib/libbsp/arm/nds/startup/bspstart.c index 0fc67d374e..59c074e410 100644 --- a/c/src/lib/libbsp/arm/nds/startup/bspstart.c +++ b/c/src/lib/libbsp/arm/nds/startup/bspstart.c @@ -43,7 +43,7 @@ void bsp_start (void) arm_cpu_mode = 0x1f; /* configure clock period */ - Configuration.microseconds_per_tick = 10000; /* us */ + rtems_configuration_set_microseconds_per_tick (10000); defaultExceptionHandler (); } diff --git a/cpukit/sapi/include/confdefs.h b/cpukit/sapi/include/confdefs.h index 0f804ee7cc..d4f21ca376 100644 --- a/cpukit/sapi/include/confdefs.h +++ b/cpukit/sapi/include/confdefs.h @@ -2323,6 +2323,7 @@ rtems_fs_init_functions_t rtems_fs_init_helper = CONFIGURE_STACK_SPACE_SIZE, /* required stack space */ CONFIGURE_MAXIMUM_USER_EXTENSIONS, /* maximum dynamic extensions */ CONFIGURE_MICROSECONDS_PER_TICK, /* microseconds per clock tick */ + 1000 * CONFIGURE_MICROSECONDS_PER_TICK, /* nanoseconds per clock tick */ CONFIGURE_TICKS_PER_TIMESLICE, /* ticks per timeslice quantum */ CONFIGURE_IDLE_TASK_BODY, /* user's IDLE task */ CONFIGURE_IDLE_TASK_STACK_SIZE, /* IDLE task stack size */ diff --git a/cpukit/sapi/include/rtems/config.h b/cpukit/sapi/include/rtems/config.h index 8bc5aea50c..58b350da76 100644 --- a/cpukit/sapi/include/rtems/config.h +++ b/cpukit/sapi/include/rtems/config.h @@ -146,6 +146,13 @@ typedef struct { */ uint32_t microseconds_per_tick; + /** This field specifies the number of nanoseconds which elapse + * between clock ticks. This value is derived from the + * microseconds_per_tick field and provided to avoid calculation at + * run-time. + */ + uint32_t nanoseconds_per_tick; + /** This field specifies the number of ticks in each task's timeslice. */ uint32_t ticks_per_timeslice; @@ -281,7 +288,13 @@ extern rtems_configuration_table Configuration; #define rtems_configuration_get_milliseconds_per_tick() \ (Configuration.microseconds_per_tick / 1000) #define rtems_configuration_get_nanoseconds_per_tick() \ - (Configuration.microseconds_per_tick * 1000) + (Configuration.nanoseconds_per_tick) +#define rtems_configuration_set_microseconds_per_tick( _us ) \ + do { \ + Configuration.microseconds_per_tick = (_us); \ + Configuration.nanoseconds_per_tick = \ + 1000 * Configuration.microseconds_per_tick; \ + } while (0) #define rtems_configuration_get_ticks_per_timeslice() \ (Configuration.ticks_per_timeslice) |