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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-12 10:31:38 +0100 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-02-14 10:28:29 +0100 |
commit | 24bf11eca11947d961cc9bb5f7d92dabff169e93 (patch) | |
tree | b28f3aa8a21df91e8feaf324613aa76460559837 /cpukit/score/cpu/bfin/rtems | |
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/bfin/rtems')
-rw-r--r-- | cpukit/score/cpu/bfin/rtems/score/cpu.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/cpukit/score/cpu/bfin/rtems/score/cpu.h b/cpukit/score/cpu/bfin/rtems/score/cpu.h index a8c60a5c44..1f7faa2dcf 100644 --- a/cpukit/score/cpu/bfin/rtems/score/cpu.h +++ b/cpukit/score/cpu/bfin/rtems/score/cpu.h @@ -1280,6 +1280,18 @@ static inline uint32_t CPU_swap_u32( #define CPU_swap_u16( value ) \ (((value&0xff) << 8) | ((value >> 8)&0xff)) +typedef uint32_t CPU_Counter_ticks; + +CPU_Counter_ticks _CPU_Counter_read( void ); + +static inline CPU_Counter_ticks _CPU_Counter_difference( + CPU_Counter_ticks second, + CPU_Counter_ticks first +) +{ + return second - first; +} + #endif /* ASM */ #ifdef __cplusplus |