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https://github.com/riscv-software-src/opensbi.git
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11bf49b444
The original code returns the value of the word before modification. When modifying the upper 32 bits under RV64, the value returned via int return will have no meaning. Corrected to return the value of the bit. And modify the function description. Signed-off-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef __RISCV_ATOMIC_H__
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#define __RISCV_ATOMIC_H__
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typedef struct {
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volatile long counter;
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} atomic_t;
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#define ATOMIC_INIT(_lptr, val) (_lptr)->counter = (val)
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#define ATOMIC_INITIALIZER(val) \
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{ \
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.counter = (val), \
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}
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long atomic_read(atomic_t *atom);
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void atomic_write(atomic_t *atom, long value);
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long atomic_add_return(atomic_t *atom, long value);
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long atomic_sub_return(atomic_t *atom, long value);
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long atomic_cmpxchg(atomic_t *atom, long oldval, long newval);
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long atomic_xchg(atomic_t *atom, long newval);
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unsigned int atomic_raw_xchg_uint(volatile unsigned int *ptr,
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unsigned int newval);
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unsigned long atomic_raw_xchg_ulong(volatile unsigned long *ptr,
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unsigned long newval);
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/**
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* Set a bit in an atomic variable and return the value of bit before modify.
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* @nr : Bit to set.
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* @atom: atomic variable to modify
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*/
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int atomic_set_bit(int nr, atomic_t *atom);
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/**
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* Clear a bit in an atomic variable and return the value of bit before modify.
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* @nr : Bit to set.
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* @atom: atomic variable to modify
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*/
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int atomic_clear_bit(int nr, atomic_t *atom);
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/**
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* Set a bit in any address and return the value of bit before modify.
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* @nr : Bit to set.
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* @addr: Address to modify
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*/
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int atomic_raw_set_bit(int nr, volatile unsigned long *addr);
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/**
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* Clear a bit in any address and return the value of bit before modify.
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* @nr : Bit to set.
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* @addr: Address to modify
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*/
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int atomic_raw_clear_bit(int nr, volatile unsigned long *addr);
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#endif
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