76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/* $NetBSD: asm_single.h,v 1.4 2002/01/25 16:42:22 thorpej Exp $ */
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/*
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* Copyright (c) 1996 Leo Weppelman.
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* All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Leo Weppelman.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _M68K_ASM_SINGLE_H
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#define _M68K_ASM_SINGLE_H
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/*
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* Provide bit manipulation macro's that resolve to a single instruction.
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* These can be considered atomic on single processor architectures when
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* no page faults can occur when acessing <var>.
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* There primary use is to avoid race conditions when manipulating device
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* registers.
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*/
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#define single_inst_bset_b(var, bit) \
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__asm __volatile ("orb %1,%0" \
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: "=m" (var) \
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: "di" ((u_char)bit), "0" (var))
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#define single_inst_bclr_b(var, bit) \
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__asm __volatile ("andb %1,%0" \
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: "=m" (var) \
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: "di" ((u_char)~(bit)), "0" (var))
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#define single_inst_bset_w(var, bit) \
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__asm __volatile ("orw %1,%0" \
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: "=m" (var) \
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: "di" ((u_short)bit), "0" (var))
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#define single_inst_bclr_w(var, bit) \
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__asm __volatile ("andw %1,%0" \
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: "=m" (var) \
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: "di" ((u_short)~(bit)), "0" (var))
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#define single_inst_bset_l(var, bit) \
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__asm __volatile ("orl %1,%0" \
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: "=m" (var) \
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: "di" ((u_long)bit), "0" (var))
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#define single_inst_bclr_l(var, bit) \
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__asm __volatile ("andl %1,%0" \
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: "=m" (var) \
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: "di" ((u_long)~(bit)), "0" (var))
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#endif /* _M68K_ASM_SINGLE_H */
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