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/* Copyright (c) 2021, ARM Limited
* Copyright (c) 2021, Nokia
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef ODP_API_ABI_ATOMIC_INLINES_H_
#define ODP_API_ABI_ATOMIC_INLINES_H_
#include <odp/api/atomic.h>
#ifdef _ODP_LOCK_FREE_128BIT_ATOMICS
/**
* @internal
* Helper macro for lockless atomic CAS operations on 128-bit integers
* @param[in,out] atom Pointer to the 128-bit atomic variable
* @param oper CAS operation
* @param old_val Old value
* @param new_val New value to be swapped
* @return 1 for success and 0 for fail
*/
#define ATOMIC_CAS_OP_128(atom, oper, old_val, new_val, val) \
({ \
odp_u128_t _val; \
odp_atomic_u128_t *_atom = atom; \
odp_u128_t *_old_val = old_val; \
odp_u128_t _new_val = new_val; \
odp_u128_t *ptr = (odp_u128_t *)(_atom); \
register uint64_t old0 __asm__ ("x0"); \
register uint64_t old1 __asm__ ("x1"); \
register uint64_t new0 __asm__ ("x2"); \
register uint64_t new1 __asm__ ("x3"); \
old0 = (uint64_t)(_old_val)->u64[0]; \
old1 = (uint64_t)(_old_val)->u64[1]; \
new0 = (uint64_t)(_new_val).u64[0]; \
new1 = (uint64_t)(_new_val).u64[1]; \
__asm__ volatile(oper " %[old0], %[old1], %[new0], %[new1], [%[ptr]]" \
: [old0] "+r" (old0), [old1] "+r" (old1) \
: [new0] "r" (new0), [new1] "r" (new1), \
[ptr] "r" (ptr) \
: "memory"); \
_val.u64[0] = old0; \
_val.u64[1] = old1; \
val = _val; \
})
#define ATOMIC_CAS_OP_128_NO_ORDER(atom, old_value, new_value, val) \
ATOMIC_CAS_OP_128(atom, "casp", old_value, new_value, val)
#define ATOMIC_CAS_OP_128_ACQ(atom, old_value, new_value, val) \
ATOMIC_CAS_OP_128(atom, "caspa", old_value, new_value, val)
#define ATOMIC_CAS_OP_128_REL(atom, old_value, new_value, val) \
ATOMIC_CAS_OP_128(atom, "caspl", old_value, new_value, val)
#define ATOMIC_CAS_OP_128_ACQ_REL(atom, old_value, new_value, val) \
ATOMIC_CAS_OP_128(atom, "caspal", old_value, new_value, val)
static inline void _odp_atomic_init_u128(odp_atomic_u128_t *atom, odp_u128_t new_val)
{
atom->v = new_val;
}
static inline odp_u128_t _odp_atomic_load_u128(odp_atomic_u128_t *atom)
{
odp_u128_t val, exp;
exp.u64[0] = 0;
exp.u64[1] = 0;
ATOMIC_CAS_OP_128_NO_ORDER(atom, &exp, exp, val);
return val;
}
static inline void _odp_atomic_store_u128(odp_atomic_u128_t *atom, odp_u128_t new_val)
{
odp_u128_t old, val;
old = atom->v;
while (1) {
ATOMIC_CAS_OP_128_NO_ORDER(atom, &old, new_val, val);
if ((val.u64[0] == old.u64[0]) && (val.u64[1] == old.u64[1]))
return;
old = val;
}
}
static inline int _odp_atomic_cas_u128(odp_atomic_u128_t *atom, odp_u128_t *old_val,
odp_u128_t new_val)
{
odp_u128_t val;
ATOMIC_CAS_OP_128_NO_ORDER(atom, old_val, new_val, val);
if ((val.u64[0] == old_val->u64[0]) && (val.u64[1] == old_val->u64[1]))
return 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return 0;
}
static inline int _odp_atomic_cas_acq_u128(odp_atomic_u128_t *atom, odp_u128_t *old_val,
odp_u128_t new_val)
{
odp_u128_t val;
ATOMIC_CAS_OP_128_ACQ(atom, old_val, new_val, val);
if ((val.u64[0] == old_val->u64[0]) && (val.u64[1] == old_val->u64[1]))
return 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return 0;
}
static inline int _odp_atomic_cas_rel_u128(odp_atomic_u128_t *atom, odp_u128_t *old_val,
odp_u128_t new_val)
{
odp_u128_t val;
ATOMIC_CAS_OP_128_REL(atom, old_val, new_val, val);
if ((val.u64[0] == old_val->u64[0]) && (val.u64[1] == old_val->u64[1]))
return 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return 0;
}
static inline int _odp_atomic_cas_acq_rel_u128(odp_atomic_u128_t *atom, odp_u128_t *old_val,
odp_u128_t new_val)
{
odp_u128_t val;
ATOMIC_CAS_OP_128_ACQ_REL(atom, old_val, new_val, val);
if ((val.u64[0] == old_val->u64[0]) && (val.u64[1] == old_val->u64[1]))
return 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return 0;
}
#else /* _ODP_LOCK_FREE_128BIT_ATOMICS */
/* Use generic implementation */
#include <odp/api/abi/atomic_generic.h>
#endif
#endif
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