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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/m32c | |
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/m32c')
-rw-r--r-- | cpukit/score/cpu/m32c/Makefile.am | 1 | ||||
-rw-r--r-- | cpukit/score/cpu/m32c/rtems/score/cpu.h | 12 |
2 files changed, 13 insertions, 0 deletions
diff --git a/cpukit/score/cpu/m32c/Makefile.am b/cpukit/score/cpu/m32c/Makefile.am index 469df12d5c..7f284b271f 100644 --- a/cpukit/score/cpu/m32c/Makefile.am +++ b/cpukit/score/cpu/m32c/Makefile.am @@ -15,6 +15,7 @@ include_rtems_score_HEADERS += rtems/score/cpuatomic.h noinst_LIBRARIES = libscorecpu.a libscorecpu_a_SOURCES = cpu.c cpu_asm.c context_switch.S context_init.c \ varvects.S +libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c libscorecpu_a_SOURCES += m32c-exception-frame-print.c libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS) diff --git a/cpukit/score/cpu/m32c/rtems/score/cpu.h b/cpukit/score/cpu/m32c/rtems/score/cpu.h index 681fb4bcd0..7b615a287d 100644 --- a/cpukit/score/cpu/m32c/rtems/score/cpu.h +++ b/cpukit/score/cpu/m32c/rtems/score/cpu.h @@ -1233,6 +1233,18 @@ 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; +} + #ifdef __cplusplus } #endif |