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-rw-r--r--arch/alpha/include/asm/cmpxchg.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/cmpxchg.h b/arch/alpha/include/asm/cmpxchg.h
new file mode 100644
index 0000000000..91d4a4d925
--- /dev/null
+++ b/arch/alpha/include/asm/cmpxchg.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ALPHA_CMPXCHG_H
+#define _ALPHA_CMPXCHG_H
+
+/*
+ * Atomic exchange routines.
+ */
+
+#define ____xchg(type, args...) __arch_xchg ## type ## _local(args)
+#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args)
+#include <asm/xchg.h>
+
+#define xchg_local(ptr, x) \
+({ \
+ __typeof__(*(ptr)) _x_ = (x); \
+ (__typeof__(*(ptr))) __arch_xchg_local((ptr), (unsigned long)_x_,\
+ sizeof(*(ptr))); \
+})
+
+#define arch_cmpxchg_local(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
+ (unsigned long)_n_, \
+ sizeof(*(ptr))); \
+})
+
+#define arch_cmpxchg64_local(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ cmpxchg_local((ptr), (o), (n)); \
+})
+
+#undef ____xchg
+#undef ____cmpxchg
+#define ____xchg(type, args...) __arch_xchg ##type(args)
+#define ____cmpxchg(type, args...) __cmpxchg ##type(args)
+#include <asm/xchg.h>
+
+/*
+ * The leading and the trailing memory barriers guarantee that these
+ * operations are fully ordered.
+ */
+#define arch_xchg(ptr, x) \
+({ \
+ __typeof__(*(ptr)) __ret; \
+ __typeof__(*(ptr)) _x_ = (x); \
+ smp_mb(); \
+ __ret = (__typeof__(*(ptr))) \
+ __arch_xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
+ smp_mb(); \
+ __ret; \
+})
+
+#define arch_cmpxchg(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) __ret; \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ smp_mb(); \
+ __ret = (__typeof__(*(ptr))) __cmpxchg((ptr), \
+ (unsigned long)_o_, (unsigned long)_n_, sizeof(*(ptr)));\
+ smp_mb(); \
+ __ret; \
+})
+
+#define arch_cmpxchg64(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ arch_cmpxchg((ptr), (o), (n)); \
+})
+
+#undef ____cmpxchg
+
+#endif /* _ALPHA_CMPXCHG_H */