[v4,1/2] eal: add 128-bit cmpset (x86-64 only)
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Commit Message
This operation can be used for non-blocking algorithms, such as a
non-blocking stack or ring.
Signed-off-by: Gage Eads <gage.eads@intel.com>
---
.../common/include/arch/x86/rte_atomic_64.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
@@ -34,6 +34,7 @@
/*
* Inspired from FreeBSD src/sys/amd64/include/atomic.h
* Copyright (c) 1998 Doug Rabson
+ * Copyright (c) 2019 Intel Corporation
* All rights reserved.
*/
@@ -208,4 +209,25 @@ static inline void rte_atomic64_clear(rte_atomic64_t *v)
}
#endif
+static inline int
+rte_atomic128_cmpset(volatile uint64_t *dst, uint64_t *exp, uint64_t *src)
+{
+ uint8_t res;
+
+ asm volatile (
+ MPLOCKED
+ "cmpxchg16b %[dst];"
+ " sete %[res]"
+ : [dst] "=m" (*dst),
+ [res] "=r" (res)
+ : "c" (src[1]),
+ "b" (src[0]),
+ "m" (*dst),
+ "d" (exp[1]),
+ "a" (exp[0])
+ : "memory");
+
+ return res;
+}
+
#endif /* _RTE_ATOMIC_X86_64_H_ */