New upstream version 18.08

[deb_dpdk.git] / lib / librte_eal / common / include / arch / x86 / rte_atomic_64.h

diff --git a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
index 1a53a76..fd2ec9c 100644 (file)
--- a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
@@ -71,6 +71,18 @@ rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src)
        return res;
 }
 
+static inline uint64_t
+rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val)
+{
+       asm volatile(
+                       MPLOCKED
+                       "xchgq %0, %1;"
+                       : "=r" (val), "=m" (*dst)
+                       : "0" (val),  "m" (*dst)
+                       : "memory");         /* no-clobber list */
+       return val;
+}
+
 static inline void
 rte_atomic64_init(rte_atomic64_t *v)
 {