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/* Copyright (c) 2015-2018, Linaro Limited
* Copyright (c) 2021, ARM Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <odp/api/atomic.h>
#include <odp_cpu.h>
int odp_atomic_lock_free_u64(odp_atomic_op_t *atomic_op)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
/* All operations have locks */
if (atomic_op)
atomic_op->all_bits = 0;
return 0;
#else
/* All operations are lock-free */
if (atomic_op) {
atomic_op->all_bits = ~((uint32_t)0);
atomic_op->op.init = 0;
}
return 2;
#endif
}
int odp_atomic_lock_free_u128(odp_atomic_op_t *atomic_op)
{
#ifdef _ODP_LOCK_FREE_128BIT_ATOMICS
if (atomic_op) {
atomic_op->all_bits = 0;
atomic_op->op.load = 1;
atomic_op->op.store = 1;
atomic_op->op.cas = 1;
}
return 2;
#else
/* All operations have locks */
if (atomic_op)
atomic_op->all_bits = 0;
return 0;
#endif
}
#ifdef _ODP_LOCK_FREE_128BIT_ATOMICS
static void __atomic_init_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 odp_u128_t __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 void __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 int __atomic_cas_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
int ret = 0;
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]))
ret = 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return ret;
}
static int __atomic_cas_acq_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
int ret = 0;
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]))
ret = 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return ret;
}
static int __atomic_cas_rel_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
int ret = 0;
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]))
ret = 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return ret;
}
static int __atomic_cas_acq_rel_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val,
odp_u128_t new_val)
{
int ret = 0;
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]))
ret = 1;
old_val->u64[0] = val.u64[0];
old_val->u64[1] = val.u64[1];
return ret;
}
#else /* Locked version */
/**
* @internal
* 128 bit store operation expression for the ATOMIC_OP macro
*/
#define ATOMIC_STORE_OP_128(new_val) \
({ \
(_atom)->v = (new_val); \
})
/**
* @internal
* 128 bit CAS operation expression for the ATOMIC_OP macro
*/
#define ATOMIC_CAS_OP_128(ret_ptr, old_val, new_val) \
({ \
int *_ret_ptr = ret_ptr; \
odp_u128_t *_old_val = old_val; \
odp_u128_t _new_val = new_val; \
if (((_atom)->v.u64[0] == (_old_val)->u64[0]) && \
((_atom)->v.u64[1] == (_old_val)->u64[1])) { \
(_atom)->v = (_new_val); \
*(_ret_ptr) = 1; \
} else { \
*(_ret_ptr) = 0; \
} \
})
/**
* @internal
* Helper macro for lock-based atomic operations on 128-bit integers
* @param[in,out] atom Pointer to the 128-bit atomic variable
* @param expr Expression used update the variable.
* @return The old value of the variable.
*/
#define ATOMIC_OP_128(atom, expr) \
({ \
odp_u128_t _old_val; \
odp_atomic_u128_t *_atom = atom; \
/* Loop while lock is already taken, stop when lock becomes clear */ \
while (__atomic_test_and_set(&(_atom)->lock, __ATOMIC_ACQUIRE)) \
(void)0; \
_old_val = (_atom)->v; \
(expr); /* Perform whatever update is desired */ \
__atomic_clear(&(_atom)->lock, __ATOMIC_RELEASE); \
_old_val; /* Return old value */ \
})
static void __atomic_init_u128(odp_atomic_u128_t *atom, odp_u128_t val)
{
atom->lock = 0;
ATOMIC_OP_128(atom, ATOMIC_STORE_OP_128(val));
}
static odp_u128_t __atomic_load_u128(odp_atomic_u128_t *atom)
{
return ATOMIC_OP_128(atom, (void)0);
}
static void __atomic_store_u128(odp_atomic_u128_t *atom, odp_u128_t val)
{
ATOMIC_OP_128(atom, ATOMIC_STORE_OP_128(val));
}
static int __atomic_cas_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
int ret;
*old_val = ATOMIC_OP_128(atom, ATOMIC_CAS_OP_128(&ret, old_val,
new_val));
return ret;
}
static int __atomic_cas_acq_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val,
odp_u128_t new_val)
{
int ret;
*old_val = ATOMIC_OP_128(atom, ATOMIC_CAS_OP_128(&ret, old_val,
new_val));
return ret;
}
static int __atomic_cas_rel_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val,
odp_u128_t new_val)
{
int ret;
*old_val = ATOMIC_OP_128(atom, ATOMIC_CAS_OP_128(&ret, old_val,
new_val));
return ret;
}
static int __atomic_cas_acq_rel_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val,
odp_u128_t new_val)
{
int ret;
*old_val = ATOMIC_OP_128(atom, ATOMIC_CAS_OP_128(&ret, old_val,
new_val));
return ret;
}
#endif
void odp_atomic_init_u128(odp_atomic_u128_t *atom, odp_u128_t val)
{
__atomic_init_u128(atom, val);
}
odp_u128_t odp_atomic_load_u128(odp_atomic_u128_t *atom)
{
return __atomic_load_u128(atom);
}
void odp_atomic_store_u128(odp_atomic_u128_t *atom, odp_u128_t val)
{
__atomic_store_u128(atom, val);
}
int odp_atomic_cas_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
return __atomic_cas_u128(atom, old_val, new_val);
}
int odp_atomic_cas_acq_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
return __atomic_cas_acq_u128(atom, old_val, new_val);
}
int odp_atomic_cas_rel_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
return __atomic_cas_rel_u128(atom, old_val, new_val);
}
int odp_atomic_cas_acq_rel_u128(odp_atomic_u128_t *atom,
odp_u128_t *old_val, odp_u128_t new_val)
{
return __atomic_cas_acq_rel_u128(atom, old_val, new_val);
}
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