Signed-off-by: Ola Liljedahl <ola.liljed...@arm.com>
Reviewed-by: Brian Brooks <brian.bro...@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com>
---
platform/linux-generic/include/odp_bitset.h | 155 ++++++++++++++++++++++++++++
1 file changed, 155 insertions(+)
create mode 100644 platform/linux-generic/include/odp_bitset.h
diff --git a/platform/linux-generic/include/odp_bitset.h
b/platform/linux-generic/include/odp_bitset.h
new file mode 100644
index 00000000..db004267
--- /dev/null
+++ b/platform/linux-generic/include/odp_bitset.h
@@ -0,0 +1,155 @@
+/* Copyright (c) 2017, ARM Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef _ODP_BITSET_H_
+#define _ODP_BITSET_H_
+
+/******************************************************************************
+ * bitset abstract data type
+ *****************************************************************************/
+/* This could be a struct of scalars to support larger bit sets */
+
+#if ATOM_BITSET_SIZE <= 32
+
+typedef uint32_t bitset_t;
+
+static inline bitset_t bitset_mask(uint32_t bit)
+{
+ return 1UL << bit;
+}
+
+/* Return first-bit-set with StdC ffs() semantics */
+static inline uint32_t bitset_ffs(bitset_t b)
+{
+ return __builtin_ffsl(b);
+}
+
+/* Load-exclusive with memory ordering */
+static inline bitset_t bitset_ldex(bitset_t *bs, int mo)
+{
+ return LDXR32(bs, mo);
+}
+
+#elif ATOM_BITSET_SIZE <= 64
+
+typedef uint64_t bitset_t;
+
+static inline bitset_t bitset_mask(uint32_t bit)
+{
+ return 1ULL << bit;
+}
+
+/* Return first-bit-set with StdC ffs() semantics */
+static inline uint32_t bitset_ffs(bitset_t b)
+{
+ return __builtin_ffsll(b);
+}
+
+/* Load-exclusive with memory ordering */
+static inline bitset_t bitset_ldex(bitset_t *bs, int mo)
+{
+ return LDXR64(bs, mo);
+}
+
+#elif ATOM_BITSET_SIZE <= 128
+
+#if __SIZEOF_INT128__ == 16
+typedef unsigned __int128 bitset_t;
+
+static inline bitset_t bitset_mask(uint32_t bit)
+{
+ if (bit < 64)
+ return 1ULL << bit;
+ else
+ return (unsigned __int128)(1ULL << (bit - 64)) << 64;
+}
+
+/* Return first-bit-set with StdC ffs() semantics */
+static inline uint32_t bitset_ffs(bitset_t b)
+{
+ if ((uint64_t)b != 0)
+ return __builtin_ffsll((uint64_t)b);
+ else if ((b >> 64) != 0)
+ return __builtin_ffsll((uint64_t)(b >> 64)) + 64;
+ else
+ return 0;
+}
+
+/* Load-exclusive with memory ordering */
+static inline bitset_t bitset_ldex(bitset_t *bs, int mo)
+{
+ return LDXR128(bs, mo);
+}
+
+#else
+#error __int128 not supported by compiler
+#endif
+
+#else
+#error Unsupported size of bit sets (ATOM_BITSET_SIZE)
+#endif
+
+/* Atomic load with memory ordering */
+static inline bitset_t atom_bitset_load(bitset_t *bs, int mo)
+{
+ return __atomic_load_n(bs, mo);
+}
+
+/* Atomic bit set with memory ordering */
+static inline void atom_bitset_set(bitset_t *bs, uint32_t bit, int mo)
+{
+ (void)__atomic_fetch_or(bs, bitset_mask(bit), mo);
+}
+
+/* Atomic bit clear with memory ordering */
+static inline void atom_bitset_clr(bitset_t *bs, uint32_t bit, int mo)
+{
+ (void)__atomic_fetch_and(bs, ~bitset_mask(bit), mo);
+}
+
+/* Atomic exchange with memory ordering */
+static inline bitset_t atom_bitset_xchg(bitset_t *bs, bitset_t neu, int mo)
+{
+ return __atomic_exchange_n(bs, neu, mo);
+}
+
+/* Return a & ~b */
+static inline bitset_t bitset_andn(bitset_t a, bitset_t b)
+{
+ return a & ~b;
+}
+
+static inline bool bitset_is_eql(bitset_t a, bitset_t b)
+{
+ return a == b;
+}
+
+static inline bitset_t bitset_clr(bitset_t bs, uint32_t bit)
+{
+ return bs & ~bitset_mask(bit);
+}
+
+static inline bitset_t bitset_set(bitset_t bs, uint32_t bit)
+{
+ return bs | bitset_mask(bit);
+}
+
+static inline bitset_t bitset_null(void)
+{
+ return 0U;
+}
+
+static inline bool bitset_is_null(bitset_t a)
+{
+ return a == 0U;
+}
+
+static inline bool bitset_is_set(bitset_t a, uint32_t bit)
+{
+ return (a & bitset_mask(bit)) != 0;
+}
+
+#endif
--
2.12.2
