1 files changed, 87 insertions, 0 deletions
diff --git a/arch/sh/atomic.h b/arch/sh/atomic.h
new file mode 100644
index 00000000..104a4f12
--- /dev/null
+++ b/arch/sh/atomic.h
@@ -0,0 +1,87 @@
+#ifndef _INTERNAL_ATOMIC_H
+#define _INTERNAL_ATOMIC_H
+
+#include <stdint.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);
+}
+
+int  __sh_cas(volatile int *, int, int);
+int  __sh_swap(volatile int *, int);
+int  __sh_fetch_add(volatile int *, int);
+void __sh_store(volatile int *, int);
+void __sh_and(volatile int *, int);
+void __sh_or(volatile int *, int);
+
+#define a_cas(p,t,s)     __sh_cas(p,t,s)
+#define a_swap(x,v)      __sh_swap(x,v)
+#define a_fetch_add(x,v) __sh_fetch_add(x, v)
+#define a_store(x,v)     __sh_store(x, v)
+#define a_and(x,v)       __sh_and(x, v)
+#define a_or(x,v)        __sh_or(x, v)
+
+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 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_spin()
+{
+}
+
+static inline void a_crash()
+{
+	*(volatile char *)0=0;
+}
+
+static inline void a_or_l(volatile void *p, long v)
+{
+	a_or(p, v);
+}
+
+static inline void a_and_64(volatile uint64_t *p, uint64_t v)
+{
+	union { uint64_t v; uint32_t r[2]; } u = { v };
+	a_and((int *)p,   u.r[0]);
+	a_and((int *)p+1, u.r[1]);
+}
+
+static inline void a_or_64(volatile uint64_t *p, uint64_t v)
+{
+	union { uint64_t v; uint32_t r[2]; } u = { v };
+	a_or((int *)p,   u.r[0]);
+	a_or((int *)p+1, u.r[1]);
+}
+
+#endif