1*b6cbf720SGianluca Guida/* $NetBSD: byte_swap_2.S,v 1.3 2009/12/14 00:39:00 matt Exp $ */ 2*b6cbf720SGianluca Guida 3*b6cbf720SGianluca Guida/*- 4*b6cbf720SGianluca Guida * Copyright (c) 1991, 1993 5*b6cbf720SGianluca Guida * The Regents of the University of California. All rights reserved. 6*b6cbf720SGianluca Guida * 7*b6cbf720SGianluca Guida * This code is derived from software contributed to Berkeley by 8*b6cbf720SGianluca Guida * Ralph Campbell. 9*b6cbf720SGianluca Guida * 10*b6cbf720SGianluca Guida * Redistribution and use in source and binary forms, with or without 11*b6cbf720SGianluca Guida * modification, are permitted provided that the following conditions 12*b6cbf720SGianluca Guida * are met: 13*b6cbf720SGianluca Guida * 1. Redistributions of source code must retain the above copyright 14*b6cbf720SGianluca Guida * notice, this list of conditions and the following disclaimer. 15*b6cbf720SGianluca Guida * 2. Redistributions in binary form must reproduce the above copyright 16*b6cbf720SGianluca Guida * notice, this list of conditions and the following disclaimer in the 17*b6cbf720SGianluca Guida * documentation and/or other materials provided with the distribution. 18*b6cbf720SGianluca Guida * 3. Neither the name of the University nor the names of its contributors 19*b6cbf720SGianluca Guida * may be used to endorse or promote products derived from this software 20*b6cbf720SGianluca Guida * without specific prior written permission. 21*b6cbf720SGianluca Guida * 22*b6cbf720SGianluca Guida * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23*b6cbf720SGianluca Guida * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24*b6cbf720SGianluca Guida * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25*b6cbf720SGianluca Guida * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26*b6cbf720SGianluca Guida * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27*b6cbf720SGianluca Guida * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28*b6cbf720SGianluca Guida * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29*b6cbf720SGianluca Guida * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30*b6cbf720SGianluca Guida * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31*b6cbf720SGianluca Guida * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32*b6cbf720SGianluca Guida * SUCH DAMAGE. 33*b6cbf720SGianluca Guida */ 34*b6cbf720SGianluca Guida 35*b6cbf720SGianluca Guida#include <mips/asm.h> 36*b6cbf720SGianluca Guida 37*b6cbf720SGianluca Guida#if defined(LIBC_SCCS) && !defined(lint) 38*b6cbf720SGianluca Guida#if 0 39*b6cbf720SGianluca Guida RCSID("from: @(#)htons.s 8.1 (Berkeley) 6/4/93") 40*b6cbf720SGianluca Guida#else 41*b6cbf720SGianluca Guida RCSID("$NetBSD: byte_swap_2.S,v 1.3 2009/12/14 00:39:00 matt Exp $") 42*b6cbf720SGianluca Guida#endif 43*b6cbf720SGianluca Guida#endif /* LIBC_SCCS and not lint */ 44*b6cbf720SGianluca Guida 45*b6cbf720SGianluca Guida#undef _LOCORE 46*b6cbf720SGianluca Guida#define _LOCORE /* XXX not really, just assembly-code source */ 47*b6cbf720SGianluca Guida#include <machine/endian.h> 48*b6cbf720SGianluca Guida 49*b6cbf720SGianluca Guida#if defined(_KERNEL) || defined(_STANDALONE) 50*b6cbf720SGianluca Guida#define BSWAP16_NAME bswap16 51*b6cbf720SGianluca Guida#else 52*b6cbf720SGianluca Guida#define BSWAP16_NAME __bswap16 53*b6cbf720SGianluca Guida#endif 54*b6cbf720SGianluca Guida 55*b6cbf720SGianluca GuidaNLEAF(BSWAP16_NAME) 56*b6cbf720SGianluca Guida#if BYTE_ORDER == LITTLE_ENDIAN 57*b6cbf720SGianluca GuidaALEAF(htons) 58*b6cbf720SGianluca GuidaALEAF(ntohs) 59*b6cbf720SGianluca Guida#endif 60*b6cbf720SGianluca Guida#if (__mips == 32 || __mips == 64) && __mips_isa_rev == 2 61*b6cbf720SGianluca Guida /* 62*b6cbf720SGianluca Guida * If we are on MIPS32r2 or MIPS64r2, use the new instructions 63*b6cbf720SGianluca Guida */ 64*b6cbf720SGianluca Guida wsbh a0, a0 # word swap bytes within halfwords 65*b6cbf720SGianluca Guida and v0, a0, 0xffff # bound it to 16bits 66*b6cbf720SGianluca Guida j ra 67*b6cbf720SGianluca Guida#else 68*b6cbf720SGianluca Guida srl v0, a0, 8 69*b6cbf720SGianluca Guida and v0, v0, 0xff 70*b6cbf720SGianluca Guida sll v1, a0, 8 71*b6cbf720SGianluca Guida and v1, v1, 0xff00 72*b6cbf720SGianluca Guida or v0, v0, v1 73*b6cbf720SGianluca Guida j ra 74*b6cbf720SGianluca Guida#endif 75*b6cbf720SGianluca GuidaEND(BSWAP16_NAME) 76*b6cbf720SGianluca Guida 77*b6cbf720SGianluca Guida#if BYTE_ORDER == BIG_ENDIAN 78*b6cbf720SGianluca GuidaNLEAF(htons) 79*b6cbf720SGianluca GuidaALEAF(ntohs) 80*b6cbf720SGianluca Guida move v0, a0 81*b6cbf720SGianluca Guida j ra 82*b6cbf720SGianluca GuidaEND(htons) 83*b6cbf720SGianluca Guida#endif 84