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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/m68k | |
| 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/m68k')
| -rw-r--r-- | cpukit/score/cpu/m68k/Makefile.am | 1 | ||||
| -rw-r--r-- | cpukit/score/cpu/m68k/rtems/score/cpu.h | 12 |
2 files changed, 13 insertions, 0 deletions
diff --git a/cpukit/score/cpu/m68k/Makefile.am b/cpukit/score/cpu/m68k/Makefile.am index 9d8d333dab..360dca784a 100644 --- a/cpukit/score/cpu/m68k/Makefile.am +++ b/cpukit/score/cpu/m68k/Makefile.am @@ -19,6 +19,7 @@ include_rtems_score_HEADERS += rtems/score/types.h include_rtems_score_HEADERS += rtems/score/cpuatomic.h libscorecpu_a_SOURCES = cpu.c cpu_asm.S +libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c libscorecpu_a_SOURCES += m68k-exception-frame-print.c libscorecpu_a_SOURCES += __m68k_read_tp.c diff --git a/cpukit/score/cpu/m68k/rtems/score/cpu.h b/cpukit/score/cpu/m68k/rtems/score/cpu.h index 9981f5393d..d73b53586e 100644 --- a/cpukit/score/cpu/m68k/rtems/score/cpu.h +++ b/cpukit/score/cpu/m68k/rtems/score/cpu.h @@ -723,6 +723,18 @@ void _CPU_Exception_frame_print( const CPU_Exception_frame *frame ); +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; +} + #if (M68K_HAS_FPSP_PACKAGE == 1) /* * Hooks for the Floating Point Support Package (FPSP) provided by Motorola |