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Annotation of sys/arch/m68k/include/asm_single.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: asm_single.h,v 1.3 2001/01/15 19:50:37 deraadt Exp $  */
        !             2: /*     $NetBSD: asm_single.h,v 1.1 1996/09/16 06:03:58 leo Exp $       */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1996 Leo Weppelman.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *      This product includes software developed by Leo Weppelman.
        !            19:  * 4. The name of the author may not be used to endorse or promote products
        !            20:  *    derived from this software without specific prior written permission
        !            21:  *
        !            22:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            23:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            24:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            25:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            26:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            27:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            28:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            29:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            30:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            31:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            32:  */
        !            33:
        !            34: #ifndef _M68K_ASM_SINGLE_H
        !            35: #define _M68K_ASM_SINGLE_H
        !            36: /*
        !            37:  * Provide bit manipulation macro's that resolve to a single instruction.
        !            38:  * These can be considered atomic on single processor architectures when
        !            39:  * no page faults can occur when acessing <var>.
        !            40:  * Their primary use is to avoid race conditions when manipulating device
        !            41:  * registers.
        !            42:  */
        !            43:
        !            44: #define single_inst_bset_b(var, bit)   \
        !            45:        __asm__ __volatile__ ("orb %0,%1" : : "di" ((u_char)bit), "g" (var))
        !            46: #define single_inst_bclr_b(var, bit)   \
        !            47:        __asm__ __volatile__ ("andb %0,%1" : : "di" ((u_char)~(bit)), "g" (var));
        !            48:
        !            49: #define single_inst_bset_w(var, bit)   \
        !            50:        __asm__ __volatile__ ("orw %0,%1" : : "di" ((u_short)bit), "g" (var))
        !            51: #define single_inst_bclr_w(var, bit)   \
        !            52:        __asm__ __volatile__ ("andw %0,%1" : : "di" ((u_short)~(bit)), "g" (var));
        !            53:
        !            54: #define single_inst_bset_l(var, bit)   \
        !            55:        __asm__ __volatile__ ("orl %0,%1" : : "di" ((u_long)bit), "g" (var))
        !            56: #define single_inst_bclr_l(var, bit)   \
        !            57:        __asm__ __volatile__ ("andl %0,%1" : : "di" ((u_long)~(bit)), "g" (var));
        !            58:
        !            59: #endif /* _M68K_ASM_SINGLE_H */