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