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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)

/*	$OpenBSD: srt0.S,v 1.3 2006/10/29 14:47:59 drahn Exp $	*/
/*	$NetBSD: boot.S,v 1.1 2006/09/01 21:26:18 uwe Exp $	*/

/*-
 * Copyright (c) 2005 NONAKA Kimihiro
 * All rights reserved.
 *
 * 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.
 *
 * 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>

ENTRY(start)
	bra	boot_start1
	 nop
	.balign 4
ENTRY(boot_magic)
	.long	0x20041110
ENTRY(boot_params)
	.long	boot_start1 - boot_params

	. = start + 0x80
boot_start1:
	mov	r4, r0
	add	#-4, r0
	mov.l	@(0, r0), r0
	mov.l	.L.boot_magic1, r1
	cmp/eq	r0, r1
	bf	2f
	mov	r4, r0
	mov.l	.L.boot_params_size, r3
	mov.l	@r0, r2
	mov.l	.L.boot_params, r1
	cmp/hi	r3, r2
	bf	1f
	mov	r3, r2
1:	mov.b	@r0+, r3
	mov.b	r3, @r1
	dt	r2
	bf/s	1b
	 add	#1, r1
2:
	mov.l	.L._end, r0		/* zero bss */
	mov.l	.L.__bss_start, r1
	sub	r1, r0
	shlr2	r0			/* _end and __bss_start are aligned */
	mov	#0, r2
1:	mov.l	r2, @r1
	dt	r0
	bf/s	1b
	 add	#4, r1

	mov.l	.L.boot, r0
	jsr	@r0
	 mov	r5, r4

boot_fail:
	mov	r0, r1
	mova	.L.errtxt, r0
	mov	r0, r4
	mov	#32, r0
	trapa	#0x3f
	mov	r1, r4
	mov	#32, r0
	trapa	#0x3f
	mova	.L.crlf, r0
	mov	r0, r4
	mov	#32, r0
	trapa	#0x3f
99:	bra	99b
	 nop


ENTRY(halt)
	mova	.L.pwrctl, r0
	mov	#1, r1
	mov.b	@r1, r0
	rts
	 nop

ENTRY(reboot)
ENTRY(_rtt)
	mov	#1, r4			/* reboot */
	mov	#11, r0
	trapa	#0x3f
	mov.l	.L.start, r0
	jmp	@r0
	 nop

/*
 * int raise(int sig);
 */
ENTRY(raise)
	rts
	 nop

/* 
 *
 */
ENTRY(cnset)
	rts
	 nop

/*
 * int readsects(int dev, uint32_t lba, void *buf, size_t size);
 */
ENTRY(readsects)
	mov	#2, r0
	trapa	#0x3f
	rts
	 nop

/*
 * void cache_flush(void);
 */
ENTRY(cache_flush)
	/* flush cache */
	mov	#0, r4
	mov	#6, r0
	trapa	#0x3f
	rts
	 nop

/*
 * void cache_disable(void);
 */
ENTRY(cache_disable)
	mov     #1, r4
	mov     #6, r0
	trapa   #0x3f
	rts
	 nop

        .align  2
.L.boot_magic1:
	.long	0x20031125
.L.boot_params:
	.long	boot_params
.L.boot_params_size:
	.long	boot_start1 - boot_params
.L._end:
	.long   _end
.L.__bss_start:
	.long   __bss_start
.L.boot:
	.long   _C_LABEL(boot)
.L.start:
	.long	0xc0000000
.L.pwrctl:
	.long	0xb0000003

	.align	2
.L.errtxt:	.asciz  ">>BOOT FAILED: "
	.align	2
.L.crlf:	.asciz  "\r\n"