freebsd-dev/sys/libkern/ia64/byte_swap_4.S
Doug Rabson 8d9761debf Next round of fixes to the ia64 code. This includes simulated clock and
disk drivers along with a load of fixes to context switching, fork
handling and a load of other stuff I can't remember now. This takes us as
far as start_init() before it dies. I guess now I will have to finish off
the VM system and syscall handling :-).
2000-10-04 17:53:03 +00:00

55 lines
1.7 KiB
ArmAsm

/* $FreeBSD$ */
/* $NetBSD: byte_swap_4.S,v 1.2 1996/10/17 03:08:09 cgd Exp $ */
/*
* Copyright (c) 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <machine/asm.h>
#ifndef NAME
#define NAME byte_swap_4
#endif
/*
* Byte-swap a 4-byte quantity. (Convert 0x01234567 to 0x67452301.)
*
* Argument is an unsigned 4-byte integer (u_int32_t).
*/
ENTRY(NAME, 1) /* in0 = 0x01234567 */
extr.u r16=in0,0,8 /* r16 = 0x 67 */
extr.u r17=in0,8,8 /* r17 = 0x 45 */
extr.u r18=in0,16,8 /* r18 = 0x 23 */
extr.u ret0=in0,24,8 /* ret0 = 0x 01 */
;;
dep ret0=ret0,r16,24,8 /* ret0 = 0x67 01 */
;;
dep ret0=ret0,r17,16,8 /* ret0 = 0x6745 01 */
;;
dep ret0=ret0,r16,8,8 /* ret0 = 0x67452301 */
br.ret.sptk.few rp
END(NAME)