Implement get_cycles for hppa architecture

Author: John David Anglin

src/get_clock.h

@@ -124,6 +124,14 @@ static inline cycles_t get_cycles()
 	return perf_get_cycles();
 }
 
+#elif defined(__hppa__)
+typedef unsigned long long cycles_t;
+static inline cycles_t get_cycles(void)
+{
+	cycles_t clk;
+	asm volatile("mfctl %%cr16, %0" : "=r" (clk));
+	return clk;
+}
 #else
 #warning get_cycles not implemented for this architecture: attempt asm/timex.h
 #include <asm/timex.h>