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-rw-r--r--arch/ppc/atomic.h124
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/ppc/atomic.h b/arch/ppc/atomic.h
new file mode 100644
index 00000000..af397599
--- /dev/null
+++ b/arch/ppc/atomic.h
@@ -0,0 +1,124 @@
+#ifndef _INTERNAL_ATOMIC_H
+#define _INTERNAL_ATOMIC_H
+
+#include <stdint.h>
+#include <endian.h>
+
+static inline int a_ctz_l(unsigned long x)
+{
+ static const char debruijn32[32] = {
+ 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
+ 31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
+ };
+ return debruijn32[(x&-x)*0x076be629 >> 27];
+}
+
+static inline int a_ctz_64(uint64_t x)
+{
+ uint32_t y = x;
+ if (!y) {
+ y = x>>32;
+ return 32 + a_ctz_l(y);
+ }
+ return a_ctz_l(y);
+}
+
+static inline int a_cas(volatile int *p, int t, int s)
+{
+
+ __asm__( "1: lwarx 10, 0, %1\n"
+ " stwcx. %3, 0, %1\n"
+ " bne- 1b\n"
+ " mr %0, 10\n"
+ : "=r"(t) : "r"(p), "r"(t), "r"(s) : "memory" );
+ return t;
+}
+
+static inline void *a_cas_p(volatile void *p, void *t, void *s)
+{
+ return (void *)a_cas(p, (int)t, (int)s);
+}
+
+static inline long a_cas_l(volatile void *p, long t, long s)
+{
+ return a_cas(p, t, s);
+}
+
+
+static inline int a_swap(volatile int *x, int v)
+{
+ int old;
+ do old = *x;
+ while (a_cas(x, old, v) != old);
+ return old;
+}
+
+static inline int a_fetch_add(volatile int *x, int v)
+{
+ int old;
+ do old = *x;
+ while (a_cas(x, old, old+v) != old);
+ return old;
+}
+
+static inline void a_inc(volatile int *x)
+{
+ a_fetch_add(x, 1);
+}
+
+static inline void a_dec(volatile int *x)
+{
+ a_fetch_add(x, -1);
+}
+
+static inline void a_store(volatile int *p, int x)
+{
+ *p=x;
+}
+
+static inline void a_spin()
+{
+}
+
+static inline void a_crash()
+{
+ *(volatile char *)0=0;
+}
+
+static inline void a_and(volatile int *p, int v)
+{
+ int old;
+ do old = *p;
+ while (a_cas(p, old, old&v) != old);
+}
+
+static inline void a_or(volatile int *p, int v)
+{
+ int old;
+ do old = *p;
+ while (a_cas(p, old, old|v) != old);
+}
+
+static inline void a_and_64(volatile uint64_t *p, uint64_t v)
+{
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ a_and((int *)p, v);
+ a_and((int *)p+1, v>>32);
+#else
+ a_and((int *)p+1, v);
+ a_and((int *)p, v>>32);
+#endif
+}
+
+static inline void a_or_64(volatile uint64_t *p, uint64_t v)
+{
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ a_or((int *)p, v);
+ a_or((int *)p+1, v>>32);
+#else
+ a_or((int *)p+1, v);
+ a_or((int *)p, v>>32);
+#endif
+}
+
+#endif