summaryrefslogtreecommitdiffstats
path: root/cpukit/score/cpu/mips/rtems/score/cpu.h
diff options
context:
space:
mode:
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/mips/rtems/score/cpu.h
parentbsps/arm: Fix Cortex-A9 MPCore nanoseconds handler (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/mips/rtems/score/cpu.h')
-rw-r--r--cpukit/score/cpu/mips/rtems/score/cpu.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/cpukit/score/cpu/mips/rtems/score/cpu.h b/cpukit/score/cpu/mips/rtems/score/cpu.h
index 629996117a..2f7c12a381 100644
--- a/cpukit/score/cpu/mips/rtems/score/cpu.h
+++ b/cpukit/score/cpu/mips/rtems/score/cpu.h
@@ -1193,6 +1193,17 @@ 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