108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <atomic.h>
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uint32_t atomicAdd32bits(volatile uint32_t *val, uint32_t addend)
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{
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uint32_t old;
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do {
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old = *val;
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} while (!atomicCmpXchg32bits(val, old, old + addend));
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return old;
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}
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uint32_t atomicAddByte(volatile uint8_t *val, uint32_t addend)
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{
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uint8_t old;
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do {
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old = *val;
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} while (!atomicCmpXchgByte(val, old, old + addend));
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return old;
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}
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uint32_t atomicXchgByte(volatile uint8_t *byte, uint32_t newVal)
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{
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return __atomic_exchange_n(byte, newVal, __ATOMIC_ACQ_REL);
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/*
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uint32_t oldVal;
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asm volatile(
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" xchgb %1, %0 \n"
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:"=r"(oldVal), "+m"(*byte)
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:"0"(newVal)
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:"memory"
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);
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return oldVal;
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*/
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}
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uint32_t atomicXchg32bits(volatile uint32_t *word, uint32_t newVal)
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{
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return __atomic_exchange_n(word, newVal, __ATOMIC_ACQ_REL);
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/*
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uint32_t oldVal;
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asm volatile(
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" xchgl %1, %0 \n"
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:"=r"(oldVal), "+m"(*byte)
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:"0"(newVal)
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:"memory"
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);
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return oldVal;
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*/
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}
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bool atomicCmpXchgByte(volatile uint8_t *byte, uint32_t prevVal, uint32_t newVal)
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{
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return __sync_bool_compare_and_swap (byte, prevVal, newVal);
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/*
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uint32_t ret;
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asm volatile(
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" lock cmpxchgb %2, %1 \n"
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:"=a"(ret), "+m"(*byte)
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:"r"(newVal), "0"(prevVal)
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:"cc", "memory"
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);
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return ret == prevVal;
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*/
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}
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bool atomicCmpXchg32bits(volatile uint32_t *word, uint32_t prevVal, uint32_t newVal)
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{
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return __sync_bool_compare_and_swap (word, prevVal, newVal);
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/*
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uint32_t ret;
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asm volatile(
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" lock cmpxchgl %2, %1 \n"
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:"=a"(ret), "+m"(*word)
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:"r"(newVal), "0"(prevVal)
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:"cc", "memory"
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);
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return ret == prevVal;
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*/
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}
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