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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: db_interface.c,v 1.13 2005/05/01 09:55:49 miod Exp $	*/
/*	$NetBSD: db_interface.c,v 1.24 1997/02/18 22:27:32 gwr Exp $	*/

/* 
 * Mach Operating System
 * Copyright (c) 1992 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * 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 Mellon 
 * the rights to redistribute these changes.
 */

/*
 * Interface to the "ddb" kernel debugger.
 */
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/systm.h> /* just for boothowto --eichin */

#include <uvm/uvm_extern.h>

#include <dev/cons.h>

#include <machine/trap.h>
#include <machine/db_machdep.h>

#include <ddb/db_command.h>
#include <ddb/db_var.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>


extern label_t	*db_recover;

int	db_active = 0;
db_regs_t	ddb_regs;

static void kdbprinttrap(int, int);

/*
 * Received keyboard interrupt sequence.
 */
void
kdb_kintr(regs)
	register db_regs_t *regs;
{
	if (db_active == 0 && (boothowto & RB_KDB)) {
		printf("\n\nkernel: keyboard interrupt\n");
		kdb_trap(-1, regs);
	}
}

/*
 * kdb_trap - field a TRACE or BPT trap
 * Return non-zero if we "handled" the trap.
 */
int
kdb_trap(type, regs)
	int	type;
	register db_regs_t *regs;
{

	switch (type) {
	case T_TRACE:		/* single-step */
	case T_BREAKPOINT:	/* breakpoint */
/*      case T_WATCHPOINT:*/
		break;
	case -1:
		break;
	default:
		if (!db_panic)
			return (0);

		kdbprinttrap(type, 0);
		if (db_recover != 0) {
			/* This will longjmp back to db_command_loop */
			db_error("Caught exception in ddb.\n");
			/*NOTREACHED*/
		}
		/*
		 * Tell caller "We did NOT handle the trap."
		 * Caller should panic or whatever.
		 */
		return (0);
	}

	/*
	 * We'd like to be on a separate debug stack here, but
	 * that's easier to do in locore.s before we get here.
	 * See sun3/locore.s:T_TRACE for stack switch code.
	 */

	ddb_regs = *regs;

	db_active++;
	cnpollc(TRUE);	/* set polling mode, unblank video */

	db_trap(type, 0);	/* where the work happens */

	cnpollc(FALSE);	/* resume interrupt mode */
	db_active--;

	*regs = ddb_regs;

	/*
	 * Indicate that single_step is for KDB.
	 * But lock out interrupts to prevent TRACE_KDB from setting the
	 * trace bit in the current SR (and trapping while exiting KDB).
	 */
	(void) splhigh();

	/*
	 * Tell caller "We HAVE handled the trap."
	 * Caller will return to locore and rte.
	 */
	return(1);
}

extern char *trap_type[];
extern int trap_types;

/*
 * Print trap reason.
 */
static void
kdbprinttrap(type, code)
	int	type, code;
{
	printf("kernel: ");
	if (type >= trap_types || type < 0)
		printf("type %d", type);
	else
		printf("%s", trap_type[type]);
	printf(" trap\n");
}

void
Debugger()
{
	__asm ("trap #15");
}