vppinfra: add atomic macros for __sync builtins

This is first part of addition of atomic macros with only macros for
__sync builtins.

- Based on earlier patch by Damjan (https://gerrit.fd.io/r/#/c/10729/)
Additionally
- clib_atomic_release macro added and used in the absence
of any memory barrier.
- clib_atomic_bool_cmp_and_swap added

Change-Id: Ie4e48c1e184a652018d1d0d87c4be80ddd180a3b
Original-patch-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Sirshak Das <sirshak.das@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/src/vppinfra/atomics.h b/src/vppinfra/atomics.h
new file mode 100644
index 00000000000..8ddf13801df
--- /dev/null
+++ b/src/vppinfra/atomics.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Copyright (c) 2018 Arm Limited. and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_clib_atomics_h
+#define included_clib_atomics_h
+
+/* Legacy __sync builtins */
+
+/* Full Barrier */
+#define clib_atomic_fetch_add(a, b) __sync_fetch_and_add(a, b)
+#define clib_atomic_fetch_sub(a, b) __sync_fetch_and_sub(a, b)
+#define clib_atomic_fetch_and(a, b) __sync_fetch_and_and(a, b)
+#define clib_atomic_fetch_xor(a, b) __sync_fetch_and_xor(a, b)
+#define clib_atomic_fetch_or(a, b) __sync_fetch_and_or(a, b)
+#define clib_atomic_fetch_nand(a, b) __sync_fetch_nand(a, b)
+
+#define clib_atomic_add_fetch(a, b) __sync_add_and_fetch(a, b)
+#define clib_atomic_sub_fetch(a, b) __sync_sub_and_fetch(a, b)
+#define clib_atomic_and_fetch(a, b) __sync_and_and_fetch(a, b)
+#define clib_atomic_xor_fetch(a, b) __sync_xor_and_fetch(a, b)
+#define clib_atomic_or_fetch(a, b) __sync_or_and_fetch(a, b)
+#define clib_atomic_nand_fetch(a, b) __sync_nand_and_fetch(a, b)
+
+#define clib_atomic_cmp_and_swap(addr,old,new) __sync_val_compare_and_swap(addr, old, new)
+#define clib_atomic_bool_cmp_and_swap(addr,old,new) __sync_bool_compare_and_swap(addr, old, new)
+
+/*Accquire Barrier*/
+#define clib_atomic_test_and_set(a) __sync_lock_test_and_set(a, 1)
+/*Release Barrier*/
+#define clib_atomic_release(a) __sync_lock_release(a)
+
+#endif /* included_clib_atomics_h */