Implemented benchmark timer (for the testsuite).

c/src/lib/libbsp/patmos/pasim/include/pasim.h

@@ -90,8 +90,13 @@ extern char _uart_base; /* linker symbol giving the address of the UART */
 
 extern char _timer_base; /* linker symbol giving the address of the RTC */
 
+extern void set_cpu_cycles (u64 time_warp);
+extern u64 get_cpu_cycles(void);
+extern u64 get_cpu_time(void);
+
 #define PATMOS_FREQ_MHZ 74
 #define PATMOS_FREQ_HZ ( PATMOS_FREQ_MHZ * 1000000U)
+#define PATMOS_INF 0xFFFFFFFF
 
 /* Address to access the cycle counter low register of the RTC */
 #define __PATMOS_RTC_CYCLE_LOW_ADDR (&_timer_base + 0x00)

c/src/lib/libbsp/patmos/pasim/timer/timer.c

@@ -18,19 +18,44 @@
 
 #include <bsp.h>
 
+bool benchmark_timer_find_average_overhead;
+
+#define AVG_OVERHEAD      0  /* It typically takes 0 microseconds */
+/*     to start/stop the timer. */
+#define LEAST_VALID       1  /* Don't trust a value lower than this */
+
 void benchmark_timer_initialize(void)
 {
-
+	/*
+	 *  Timer runs long and accurate enough not to require an interrupt.
+	 */
+	__PATMOS_RTC_WR_INTERVAL(PATMOS_INF);
 }
 
 int benchmark_timer_read(void)
 {
-  return 0;
+	uint32_t total;
+
+	/*
+	 *  Read the timer and see how many clicks it has been since we started.
+	 */
+
+	__PATMOS_RTC_RD_INTERVAL(total);
+
+	total = (PATMOS_INF - total)/PATMOS_FREQ_MHZ;
+
+	if ( benchmark_timer_find_average_overhead == true )
+		return total;          /* in one microsecond units */
+
+	if ( total < LEAST_VALID )
+		return 0;            /* below timer resolution */
+
+	return total - AVG_OVERHEAD;
 }
 
 void benchmark_timer_disable_subtracting_average_overhead(
-  bool find_flag
+		bool find_flag
 )
 {
-
+	benchmark_timer_find_average_overhead = find_flag;
 }

readme.txt

@@ -161,9 +161,6 @@ Alternatively, the 'build.sh' script in the T-CREST misc repository includes
 the '-t' option that runs the complete RTEMS testsuite for Patmos and checks
 its results.
 
-
-
-