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bwx.h revision 1.4 
      1 /* $NetBSD: bwx.h,v 1.4 2005/12/24 20:06:46 perry Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 #ifndef _ALPHA_BWX_H_
     41 #define	_ALPHA_BWX_H_
     42 
     43 /*
     44  * Alpha Byte/Word Extension instructions.
     45  *
     46  * These instructions are available on EV56 (21164A) and later processors.
     47  *
     48  * See "Alpha Architecture Handbook, Version 3", DEC order number EC-QD2KB-TE.
     49  */
     50 
     51 static inline u_int8_t
     52 alpha_ldbu(volatile u_int8_t *a0)
     53 {
     54 	u_int8_t v0;
     55 
     56 	__asm volatile("ldbu %0, %1"
     57 		: "=r" (v0)
     58 		: "m" (*a0));
     59 
     60 	return (v0);
     61 }
     62 
     63 static inline u_int16_t
     64 alpha_ldwu(volatile u_int16_t *a0)
     65 {
     66 	u_int16_t v0;
     67 
     68 	__asm volatile("ldwu %0, %1"
     69 		: "=r" (v0)
     70 		: "m" (*a0));
     71 
     72 	return (v0);
     73 }
     74 
     75 static inline void
     76 alpha_stb(volatile u_int8_t *a0, u_int8_t a1)
     77 {
     78 
     79 	__asm volatile("stb %1, %0"
     80 		: "=m" (*a0)
     81 		: "r" (a1));
     82 }
     83 
     84 static inline void
     85 alpha_stw(volatile u_int16_t *a0, u_int16_t a1)
     86 {
     87 
     88 	__asm volatile("stw %1, %0"
     89 		: "=m" (*a0)
     90 		: "r" (a1));
     91 }
     92 
     93 static inline u_int8_t
     94 alpha_sextb(u_int8_t a0)
     95 {
     96 	u_int8_t v0;
     97 
     98 	__asm volatile("sextb %1, %0"
     99 		: "=r" (v0)
    100 		: "r" (a0));
    101 
    102 	return (v0);
    103 }
    104 
    105 static inline u_int16_t
    106 alpha_sextw(u_int16_t a0)
    107 {
    108 	u_int16_t v0;
    109 
    110 	__asm volatile("sextw %1, %0"
    111 		: "=r" (v0)
    112 		: "r" (a0));
    113 
    114 	return (v0);
    115 }
    116 
    117 #endif /* _ALPHA_BWX_H_ */
    118