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Import of OpenBSD 4.2 release kernel tree with initial code to support 
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO

Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from locore.s.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/asm.h>

#if defined(LIBC_SCCS)
	RCSID("$NetBSD: bcopy.S,v 1.1 2001/06/19 00:22:45 fvdl Exp $")
#endif

	/*
	 * (ov)bcopy (src,dst,cnt)
	 *  ws@tools.de     (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
	 */

#ifdef MEMCOPY
ENTRY(memcpy)
#else
#ifdef MEMMOVE
ENTRY(memmove)
#else
#ifdef OVBCOPY
ENTRY(ovbcopy)
#else
ENTRY(bcopy)
#endif
#endif
#endif
#if defined(MEMCOPY) || defined(MEMMOVE)
	movq	%rdi,%r11	/* save dest */
#else
	xchgq	%rdi,%rsi
#endif
	movq	%rdx,%rcx
	movq	%rdi,%rax
	subq	%rsi,%rax
	cmpq	%rcx,%rax	/* overlapping? */
	jb	1f
	cld			/* nope, copy forwards. */
	shrq	$3,%rcx		/* copy by words */
	rep
	movsq
	movq	%rdx,%rcx
	andq	$7,%rcx		/* any bytes left? */
	rep
	movsb
#if defined(MEMCOPY) || defined(MEMMOVE)
	movq	%r11,%rax
#endif
	ret
1:
	addq	%rcx,%rdi	/* copy backwards. */
	addq	%rcx,%rsi
	std
	andq	$7,%rcx		/* any fractional bytes? */
	decq	%rdi
	decq	%rsi
	rep
	movsb
	movq	%rdx,%rcx	/* copy remainder by words */
	shrq	$3,%rcx
	subq	$7,%rsi
	subq	$7,%rdi
	rep
	movsq
#if defined(MEMCOPY) || defined(MEMMOVE)
	movq	%r11,%rax
#endif
	cld
	ret