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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-12 10:31:38 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-14 10:28:29 +0100 |
| commit | 24bf11eca11947d961cc9bb5f7d92dabff169e93 (patch) | |
| tree | b28f3aa8a21df91e8feaf324613aa76460559837 /cpukit/score/cpu/arm/rtems/score/cpu.h | |
| parent | bsps/arm: Fix Cortex-A9 MPCore nanoseconds handler (diff) | |
| download | rtems-24bf11eca11947d961cc9bb5f7d92dabff169e93.tar.bz2 | |
score: Add CPU counter support
Add a CPU counter interface to allow access to a free-running counter.
It is useful to measure short time intervals. This can be used for
example to enable profiling of critical low-level functions.
Add two busy wait functions rtems_counter_delay_ticks() and
rtems_counter_delay_nanoseconds() implemented via the CPU counter.
Diffstat (limited to 'cpukit/score/cpu/arm/rtems/score/cpu.h')
| -rw-r--r-- | cpukit/score/cpu/arm/rtems/score/cpu.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/cpukit/score/cpu/arm/rtems/score/cpu.h b/cpukit/score/cpu/arm/rtems/score/cpu.h index a2498aa489..b423dbac0a 100644 --- a/cpukit/score/cpu/arm/rtems/score/cpu.h +++ b/cpukit/score/cpu/arm/rtems/score/cpu.h @@ -555,6 +555,15 @@ static inline uint16_t CPU_swap_u16( uint16_t value ) #endif } +typedef uint32_t CPU_Counter_ticks; + +CPU_Counter_ticks _CPU_Counter_read( void ); + +CPU_Counter_ticks _CPU_Counter_difference( + CPU_Counter_ticks second, + CPU_Counter_ticks first +); + #if CPU_PROVIDES_IDLE_THREAD_BODY == TRUE void *_CPU_Thread_Idle_body( uintptr_t ignored ); #endif |