New upstream version 18.08

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

diff --git a/lib/librte_eal/common/include/arch/x86/rte_atomic.h b/lib/librte_eal/common/include/arch/x86/rte_atomic.h
index 5cfd383..148398f 100644 (file)
--- a/lib/librte_eal/common/include/arch/x86/rte_atomic.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_atomic.h
@@ -104,6 +104,18 @@ rte_atomic16_cmpset(volatile uint16_t *dst, uint16_t exp, uint16_t src)
        return res;
 }
 
+static inline uint16_t
+rte_atomic16_exchange(volatile uint16_t *dst, uint16_t val)
+{
+       asm volatile(
+                       MPLOCKED
+                       "xchgw %0, %1;"
+                       : "=r" (val), "=m" (*dst)
+                       : "0" (val),  "m" (*dst)
+                       : "memory");         /* no-clobber list */
+       return val;
+}
+
 static inline int rte_atomic16_test_and_set(rte_atomic16_t *v)
 {
        return rte_atomic16_cmpset((volatile uint16_t *)&v->cnt, 0, 1);
@@ -178,6 +190,18 @@ rte_atomic32_cmpset(volatile uint32_t *dst, uint32_t exp, uint32_t src)
        return res;
 }
 
+static inline uint32_t
+rte_atomic32_exchange(volatile uint32_t *dst, uint32_t val)
+{
+       asm volatile(
+                       MPLOCKED
+                       "xchgl %0, %1;"
+                       : "=r" (val), "=m" (*dst)
+                       : "0" (val),  "m" (*dst)
+                       : "memory");         /* no-clobber list */
+       return val;
+}
+
 static inline int rte_atomic32_test_and_set(rte_atomic32_t *v)
 {
        return rte_atomic32_cmpset((volatile uint32_t *)&v->cnt, 0, 1);