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7d54cc9165
This was broken in r357940 which introduced the __typeof use. We need the volatile qualifier to be on the pointee not the pointer otherwise it does nothing. This was found by mhorne in D26498, noticing there was a problem (a spin loop condition was hoisted for RISC-V boot code) but not the root cause of it. Reported by: mhorne Reviewed by: mhorne, mjg Approved by: mhorne, mjg Differential Revision: https://reviews.freebsd.org/D26500
73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2017 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_ATOMIC_COMMON_H_
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#define _SYS_ATOMIC_COMMON_H_
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#ifndef _MACHINE_ATOMIC_H_
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#error do not include this header, use machine/atomic.h
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#endif
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#define atomic_load_char(p) (*(volatile u_char *)(p))
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#define atomic_load_short(p) (*(volatile u_short *)(p))
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#define atomic_load_int(p) (*(volatile u_int *)(p))
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#define atomic_load_long(p) (*(volatile u_long *)(p))
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#define atomic_load_ptr(p) (*(volatile __typeof(*p) *)(p))
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#define atomic_load_8(p) (*(volatile uint8_t *)(p))
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#define atomic_load_16(p) (*(volatile uint16_t *)(p))
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#define atomic_load_32(p) (*(volatile uint32_t *)(p))
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#ifdef _LP64
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#define atomic_load_64(p) (*(volatile uint64_t *)(p))
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#endif
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#define atomic_store_char(p, v) \
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(*(volatile u_char *)(p) = (u_char)(v))
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#define atomic_store_short(p, v) \
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(*(volatile u_short *)(p) = (u_short)(v))
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#define atomic_store_int(p, v) \
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(*(volatile u_int *)(p) = (u_int)(v))
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#define atomic_store_long(p, v) \
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(*(volatile u_long *)(p) = (u_long)(v))
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#define atomic_store_ptr(p, v) \
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(*(volatile uintptr_t *)(p) = (uintptr_t)(v))
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#define atomic_store_8(p, v) \
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(*(volatile uint8_t *)(p) = (uint8_t)(v))
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#define atomic_store_16(p, v) \
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(*(volatile uint16_t *)(p) = (uint16_t)(v))
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#define atomic_store_32(p, v) \
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(*(volatile uint32_t *)(p) = (uint32_t)(v))
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#ifdef _LP64
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#define atomic_store_64(p, v) \
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(*(volatile uint64_t *)(p) = (uint64_t)(v))
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#endif
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#endif
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