Add spinlocks

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

diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index 061153873131db5964ca650a6d255e72b8035866..4839122e9328688a486aaff57b83ddcbcfbbafa5 100644 (file)
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -44,4 +44,38 @@ static inline int arch_ffz(unsigned long bitmask)
 }
 #define ARCH_HAVE_FFZ
 
+typedef struct {
+       volatile unsigned int lock;
+} spinlock_t;
+
+static inline void spin_trylock(spinlock_t *lock)
+{
+       unsigned long tmp;
+
+       __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;
+}
+
+static inline void spin_lock(spinlock_t *lock)
+{
+       while (spin_trylock(lock))
+               ;
+}
+
+static inline void spin_unlock(spinlock_t *lock)
+{
+       read_barrier();
+       lock->lock = 0;
+}
+
 #endif