eal/ppc64: use glibc for cpu cycles count

__ppc_get_timebase() reads and returns the current value of the Time
Base Register. It's more efficient as it uses the processor’s time
base facility directly.

DPDK on FreeBSD currently is not supported on Powerpc64, it should
be safe to include the sys/platform/ppc.h.

Signed-off-by: Thinh Tran <thinhtr@linux.vnet.ibm.com>
Reviewed-by: David Christensen <drc@linux.vnet.ibm.com>

diff --git a/lib/librte_eal/ppc/include/rte_cycles.h b/lib/librte_eal/ppc/include/rte_cycles.h
index 8f2e986..5585f92 100644 (file)
--- a/lib/librte_eal/ppc/include/rte_cycles.h
+++ b/lib/librte_eal/ppc/include/rte_cycles.h
@@ -10,6 +10,8 @@
 extern "C" {
 #endif
 
+#include <sys/platform/ppc.h>
+
 #include "generic/rte_cycles.h"
 
 #include <rte_byteorder.h>
@@ -24,32 +26,7 @@ extern "C" {
 static inline uint64_t
 rte_rdtsc(void)
 {
-       union {
-               uint64_t tsc_64;
-               RTE_STD_C11
-               struct {
-#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
-                       uint32_t hi_32;
-                       uint32_t lo_32;
-#else
-                       uint32_t lo_32;
-                       uint32_t hi_32;
-#endif
-               };
-       } tsc;
-       uint32_t tmp;
-
-       asm volatile(
-                       "0:\n"
-                       "mftbu   %[hi32]\n"
-                       "mftb    %[lo32]\n"
-                       "mftbu   %[tmp]\n"
-                       "cmpw    %[tmp],%[hi32]\n"
-                       "bne     0b\n"
-                       : [hi32] "=r"(tsc.hi_32), [lo32] "=r"(tsc.lo_32),
-                       [tmp] "=r"(tmp)
-                   );
-       return tsc.tsc_64;
+       return __ppc_get_timebase();
 }
 
 static inline uint64_t