linux-gen: atomic: add 128 bit atomic apis

Add 128 bit atomic compare-and-swap operations.

Signed-off-by: Govindarajan Mohandoss <govindarajan.mohandoss@arm.com>
Reviewed-by: Petri Savolainen <petri.savolainen@nokia.com>
Reviewed-by: Matias Elo <matias.elo@nokia.com>
Tested-by: Malvika Gupta <Malvika.Gupta@arm.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/platform/linux-generic/include-abi/odp/api/abi/atomic.h b/platform/linux-generic/include-abi/odp/api/abi/atomic.h
index 955b99370..13c12a79f 100644
--- a/platform/linux-generic/include-abi/odp/api/abi/atomic.h
+++ b/platform/linux-generic/include-abi/odp/api/abi/atomic.h
@@ -55,6 +55,31 @@ typedef struct ODP_ALIGNED(sizeof(uint64_t)) odp_atomic_u64_s {
 
 #endif
 
+#ifdef _ODP_LOCK_FREE_128BIT_ATOMICS
+
+/**
+ * @internal
+ * Atomic 128-bit unsigned integer
+ */
+typedef struct ODP_ALIGNED(sizeof(odp_u128_t)) odp_atomic_u128_s {
+	odp_u128_t v; /**< Actual storage for the atomic variable */
+} odp_atomic_u128_t;
+
+#else
+
+/**
+ * @internal
+ * Atomic 128-bit unsigned integer
+ */
+typedef struct ODP_ALIGNED(sizeof(odp_u128_t)) odp_atomic_u128_s {
+	odp_u128_t v; /**< Actual storage for the atomic variable */
+	/* Some architectures do not support lock-free operations on 128-bit
+	 * data types. We use a spin lock to ensure atomicity. */
+	char lock; /**< Spin lock (if needed) used to ensure atomic access */
+} odp_atomic_u128_t;
+
+#endif
+
 /** @ingroup odp_atomic
  *  @{
  */