1*8daf714eSmatt/* $NetBSD: byte_swap_4.S,v 1.3 2009/12/14 00:39:00 matt Exp $ */ 237c9f0a6Schristos 337c9f0a6Schristos/*- 437c9f0a6Schristos * Copyright (c) 1991, 1993 537c9f0a6Schristos * The Regents of the University of California. All rights reserved. 637c9f0a6Schristos * 737c9f0a6Schristos * This code is derived from software contributed to Berkeley by 837c9f0a6Schristos * Ralph Campbell. 937c9f0a6Schristos * 1037c9f0a6Schristos * Redistribution and use in source and binary forms, with or without 1137c9f0a6Schristos * modification, are permitted provided that the following conditions 1237c9f0a6Schristos * are met: 1337c9f0a6Schristos * 1. Redistributions of source code must retain the above copyright 1437c9f0a6Schristos * notice, this list of conditions and the following disclaimer. 1537c9f0a6Schristos * 2. Redistributions in binary form must reproduce the above copyright 1637c9f0a6Schristos * notice, this list of conditions and the following disclaimer in the 1737c9f0a6Schristos * documentation and/or other materials provided with the distribution. 1837c9f0a6Schristos * 3. Neither the name of the University nor the names of its contributors 1937c9f0a6Schristos * may be used to endorse or promote products derived from this software 2037c9f0a6Schristos * without specific prior written permission. 2137c9f0a6Schristos * 2237c9f0a6Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2337c9f0a6Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2437c9f0a6Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2537c9f0a6Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2637c9f0a6Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2737c9f0a6Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2837c9f0a6Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2937c9f0a6Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3037c9f0a6Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3137c9f0a6Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3237c9f0a6Schristos * SUCH DAMAGE. 3337c9f0a6Schristos */ 3437c9f0a6Schristos 3537c9f0a6Schristos#include <mips/asm.h> 3637c9f0a6Schristos 3737c9f0a6Schristos#if defined(LIBC_SCCS) && !defined(lint) 38*8daf714eSmatt#if 0 39*8daf714eSmatt RCSID("from: @(#)htonl.s 8.1 (Berkeley) 6/4/93") 40*8daf714eSmatt#else 41*8daf714eSmatt RCSID("$NetBSD: byte_swap_4.S,v 1.3 2009/12/14 00:39:00 matt Exp $") 42*8daf714eSmatt#endif 4337c9f0a6Schristos#endif /* LIBC_SCCS and not lint */ 4437c9f0a6Schristos 4537c9f0a6Schristos#undef _LOCORE 4637c9f0a6Schristos#define _LOCORE /* XXX not really, just assembly-code source */ 4737c9f0a6Schristos#include <machine/endian.h> 4837c9f0a6Schristos 491ee1a1e6Ssimonb#if defined(_KERNEL) || defined(_STANDALONE) 5037c9f0a6Schristos#define BSWAP32_NAME bswap32 5137c9f0a6Schristos#else 5237c9f0a6Schristos#define BSWAP32_NAME __bswap32 5337c9f0a6Schristos#endif 5437c9f0a6Schristos 5537c9f0a6SchristosNLEAF(BSWAP32_NAME) # a0 = 0x11223344, return 0x44332211 5637c9f0a6Schristos#if BYTE_ORDER == LITTLE_ENDIAN 5737c9f0a6SchristosALEAF(htonl) # a0 = 0x11223344, return 0x44332211 5837c9f0a6SchristosALEAF(ntohl) 5937c9f0a6Schristos#endif 60*8daf714eSmatt#if (__mips == 32 || __mips == 64) && __mips_isa_rev == 2 61*8daf714eSmatt /* 62*8daf714eSmatt * If we are on MIPS32R2 or MIPS64R2 it's much easier 63*8daf714eSmatt */ 64*8daf714eSmatt wsbh a0, a0 # word swap bytes within halfwords 65*8daf714eSmatt rotr v0, a0, 16 # rotate word 16bits 66*8daf714eSmatt j ra 67*8daf714eSmatt#else 6837c9f0a6Schristos srl v1, a0, 24 # v1 = 0x00000011 6937c9f0a6Schristos sll v0, a0, 24 # v0 = 0x44000000 7037c9f0a6Schristos or v0, v0, v1 7137c9f0a6Schristos and v1, a0, 0xff00 7237c9f0a6Schristos sll v1, v1, 8 # v1 = 0x00330000 7337c9f0a6Schristos or v0, v0, v1 7437c9f0a6Schristos srl v1, a0, 8 7537c9f0a6Schristos and v1, v1, 0xff00 # v1 = 0x00002200 7637c9f0a6Schristos or v0, v0, v1 7737c9f0a6Schristos j ra 78*8daf714eSmatt#endif 7937c9f0a6SchristosEND(BSWAP32_NAME) 8037c9f0a6Schristos 8137c9f0a6Schristos#if BYTE_ORDER == BIG_ENDIAN 8237c9f0a6SchristosNLEAF(htonl) # a0 = 0x11223344, return 0x44332211 8337c9f0a6SchristosALEAF(ntohl) 8437c9f0a6Schristos move v0, a0 8537c9f0a6Schristos j ra 8637c9f0a6SchristosEND(htonl) 8737c9f0a6Schristos#endif 88