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authorSebastian Huber <sebastian.huber@embedded-brains.de>2014-02-12 10:31:38 +0100
committerSebastian Huber <sebastian.huber@embedded-brains.de>2014-02-14 10:28:29 +0100
commit24bf11eca11947d961cc9bb5f7d92dabff169e93 (patch)
treeb28f3aa8a21df91e8feaf324613aa76460559837 /cpukit/score/cpu/h8300
parent382ea27b6a9b2952c541ec7f600517181a4431e2 (diff)
downloadrtems-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/h8300')
-rw-r--r--cpukit/score/cpu/h8300/Makefile.am1
-rw-r--r--cpukit/score/cpu/h8300/rtems/score/cpu.h12
2 files changed, 13 insertions, 0 deletions
diff --git a/cpukit/score/cpu/h8300/Makefile.am b/cpukit/score/cpu/h8300/Makefile.am
index db04025581..6a80409fe1 100644
--- a/cpukit/score/cpu/h8300/Makefile.am
+++ b/cpukit/score/cpu/h8300/Makefile.am
@@ -11,6 +11,7 @@ include_rtems_score_HEADERS += rtems/score/cpuatomic.h
noinst_LIBRARIES = libscorecpu.a
libscorecpu_a_SOURCES = cpu.c cpu_asm.S
+libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
libscorecpu_a_SOURCES += h8300-exception-frame-print.c
libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
diff --git a/cpukit/score/cpu/h8300/rtems/score/cpu.h b/cpukit/score/cpu/h8300/rtems/score/cpu.h
index 66774d4039..e73a974f9f 100644
--- a/cpukit/score/cpu/h8300/rtems/score/cpu.h
+++ b/cpukit/score/cpu/h8300/rtems/score/cpu.h
@@ -1162,6 +1162,18 @@ 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;
+}
+
/* to be provided by the BSP */
extern void H8BD_Install_IRQ(
uint32_t vector,