56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/* Copyright 2019 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Atomic operations for RISC_V */
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#ifndef __CROS_EC_ATOMIC_H
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#define __CROS_EC_ATOMIC_H
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#include "common.h"
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#include "cpu.h"
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#include "task.h"
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#define ATOMIC_OP(op, value, addr) \
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({ \
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uint32_t tmp; \
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asm volatile ( \
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"amo" #op ".w.aqrl %0, %2, %1" \
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: "=r" (tmp), "+A" (*addr) \
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: "r" (value)); \
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})
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static inline void atomic_clear(volatile uint32_t *addr, uint32_t bits)
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{
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ATOMIC_OP(and, ~bits, addr);
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}
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static inline void atomic_or(volatile uint32_t *addr, uint32_t bits)
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{
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ATOMIC_OP(or, bits, addr);
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}
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static inline void atomic_add(volatile uint32_t *addr, uint32_t value)
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{
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ATOMIC_OP(add, value, addr);
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}
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static inline void atomic_sub(volatile uint32_t *addr, uint32_t value)
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{
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ATOMIC_OP(add, -value, addr);
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}
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static inline uint32_t atomic_read_clear(volatile uint32_t *addr)
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{
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uint32_t ret;
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asm volatile (
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"amoand.w.aqrl %0, %2, %1"
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: "=r" (ret), "+A" (*addr)
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: "r" (0));
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return ret;
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}
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#endif /* __CROS_EC_ATOMIC_H */
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