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Annotation of sys/arch/m68k/include/asm_single.h, Revision 1.1.1.1

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 */