Add get_cpu_clock() for powerpc

[fio.git] / arch / arch-ppc.h

diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index 4839122e9328688a486aaff57b83ddcbcfbbafa5..87198699edaa0bf21d23d3e538cbf2f9d4008a02 100644 (file)
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -42,40 +42,23 @@ static inline int arch_ffz(unsigned long bitmask)
                return 32;
        return  __ilog2(bitmask & -bitmask);
 }
-#define ARCH_HAVE_FFZ
-
-typedef struct {
-       volatile unsigned int lock;
-} spinlock_t;
 
-static inline void spin_trylock(spinlock_t *lock)
+static inline unsigned long long get_cpu_clock(void)
 {
-       unsigned long tmp;
+    unsigned int tbl, tbu0, tbu1;
+    unsigned long long ret;
 
-       __asm__ __volatile__(
-               "1:     lwarx           %0,0,%2\n\
-               cmpwi           0,%0,0\n\
-               bne-            2f\n\
-               stwcx.          1,0,%2\n\
-               bne-            1b\n\
-               isync\n\
-               2:"     : "=&r" (tmp)
-               : (&lock->lock)
-               : "cr0", "memory");
-
-       return tmp;
-}
+    do {
+        __asm__ __volatile__ ("mftbu %0" : "=r"(tbu0));
+        __asm__ __volatile__ ("mftb %0"  : "=r"(tbl) );
+        __asm__ __volatile__ ("mftbu %0" : "=r"(tbu1));
+     } while (tbu0 != tbu1);
 
-static inline void spin_lock(spinlock_t *lock)
-{
-       while (spin_trylock(lock))
-               ;
+    ret = (((unsigned long long)tbu0) << 32) | tbl;
+    return ret;
 }
 
-static inline void spin_unlock(spinlock_t *lock)
-{
-       read_barrier();
-       lock->lock = 0;
-}
+#define ARCH_HAVE_FFZ
+#define ARCH_HAVE_CPU_CLOCK
 
 #endif