1 files changed, 112 insertions, 0 deletions
diff --git a/platform/linux-generic/arch/default/odp_atomic.h b/platform/linux-generic/arch/default/odp_atomic.h
new file mode 100644
index 000000000..eef88c7b3
--- /dev/null
+++ b/platform/linux-generic/arch/default/odp_atomic.h
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (c) 2021 ARM Limited
+ */
+
+#ifndef ODP_DEFAULT_ATOMIC_H_
+#define ODP_DEFAULT_ATOMIC_H_
+
+#include <odp_types_internal.h>
+
+#ifdef __SIZEOF_INT128__
+
+static inline _odp_u128_t lockfree_load_u128(_odp_u128_t *atomic)
+{
+	return __atomic_load_n(atomic, __ATOMIC_RELAXED);
+}
+
+static inline int lockfree_cas_acq_rel_u128(_odp_u128_t *atomic,
+					    _odp_u128_t old_val,
+					    _odp_u128_t new_val)
+{
+	return __atomic_compare_exchange_n(atomic, &old_val, new_val,
+					   0 /* strong */,
+					   __ATOMIC_ACQ_REL,
+					   __ATOMIC_RELAXED);
+}
+
+static inline int lockfree_check_u128(void)
+{
+	return __atomic_is_lock_free(16, NULL);
+}
+
+#endif
+
+#include <limits.h>
+
+/** Atomic bit set operations with memory ordering */
+#if __GCC_ATOMIC_LLONG_LOCK_FREE == 2 && \
+	__SIZEOF_LONG_LONG__ != __SIZEOF_LONG__
+typedef unsigned long long bitset_t;
+#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_LONG_LONG__)
+
+#elif __GCC_ATOMIC_LONG_LOCK_FREE == 2 && __SIZEOF_LONG__ != __SIZEOF_INT__
+typedef unsigned long bitset_t;
+#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_LONG__)
+
+#elif __GCC_ATOMIC_INT_LOCK_FREE == 2
+typedef unsigned int bitset_t;
+#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_INT__)
+
+#else
+/* Target does not support lock-free atomic operations */
+typedef unsigned int bitset_t;
+#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_INT__)
+#endif
+
+#if ATOM_BITSET_SIZE <= 32
+
+static inline bitset_t bitset_mask(uint32_t bit)
+{
+	return 1UL << bit;
+}
+
+#elif ATOM_BITSET_SIZE <= 64
+
+static inline bitset_t bitset_mask(uint32_t bit)
+{
+	return 1ULL << bit;
+}
+
+#elif ATOM_BITSET_SIZE <= 128
+
+static inline bitset_t bitset_mask(uint32_t bit)
+{
+	if (bit < 64)
+		return 1ULL << bit;
+	else
+		return (_odp_u128_t)(1ULL << (bit - 64)) << 64;
+}
+
+#else
+#error Unsupported size of bit sets (ATOM_BITSET_SIZE)
+#endif
+
+static inline bitset_t atom_bitset_load(bitset_t *bs, int mo)
+{
+	return __atomic_load_n(bs, mo);
+}
+
+static inline void atom_bitset_set(bitset_t *bs, uint32_t bit, int mo)
+{
+	(void)__atomic_fetch_or(bs, bitset_mask(bit), mo);
+}
+
+static inline void atom_bitset_clr(bitset_t *bs, uint32_t bit, int mo)
+{
+	(void)__atomic_fetch_and(bs, ~bitset_mask(bit), mo);
+}
+
+static inline bitset_t atom_bitset_xchg(bitset_t *bs, bitset_t neu, int mo)
+{
+	return __atomic_exchange_n(bs, neu, mo);
+}
+
+static inline bitset_t atom_bitset_cmpxchg(bitset_t *bs, bitset_t *old,
+					   bitset_t neu, bool weak,
+					   int mo_success, int mo_failure)
+{
+	return __atomic_compare_exchange_n(bs, old, neu, weak, mo_success,
+					   mo_failure);
+}
+
+#endif