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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_machdep.h,v 1.21 2005/12/17 07:31:26 miod Exp $	*/
/*	$NetBSD: db_machdep.h,v 1.13 1996/04/29 20:50:08 leo 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.
 */

/*
 * Machine-dependent defines for new kernel debugger.
 */
#ifndef	_PPC_DB_MACHDEP_H_
#define	_PPC_DB_MACHDEP_H_

#include <sys/types.h>
#include <uvm/uvm_param.h>
#include <machine/trap.h>

/*
 * We use Elf32 symbols in DDB.
 */
#define	DB_ELF_SYMBOLS
#define	DB_ELFSIZE	32

typedef	vaddr_t	db_addr_t;	/* address - unsigned */
typedef	long		db_expr_t;	/* expression - signed */
struct powerpc_saved_state {
	struct trapframe tf;
};
typedef struct powerpc_saved_state db_regs_t;
extern	db_regs_t ddb_regs;		/* register state */
#define DDB_REGS	(&ddb_regs)

#define	PC_REGS(regs)	((regs)->tf.srr0)
#define	SET_PC_REGS(regs, value)	PC_REGS(regs) = (value)

#define	BKPT_INST	0x7C810808	/* breakpoint instruction */

#define	BKPT_SIZE	(4)		/* size of breakpoint inst */
#define	BKPT_SET(inst)	(BKPT_INST)

#define	FIXUP_PC_AFTER_BREAK(regs)	((regs)->tf.srr0 -= 4)

#define SR_SINGLESTEP 0x8000
#define	db_clear_single_step(regs)	((regs)->tf.srr1 &= ~SR_SINGLESTEP)
#define	db_set_single_step(regs)	((regs)->tf.srr1 |=  SR_SINGLESTEP)

#define T_BREAKPOINT	0xffff
#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)

#ifdef T_WATCHPOINT
#define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
#else
#define	IS_WATCHPOINT_TRAP(type, code)	0
#endif

#define	M_RTS		0xfc0007fe
#define I_RTS		0x4c000020
#define M_BC		0xfc000000
#define I_BC		0x40000000
#define M_B		0xfc000000
#define I_B		0x50000000
#define	M_RFI		0xfc0007fe
#define	I_RFI		0x4c000064

#define	inst_trap_return(ins)	(((ins)&M_RFI) == I_RFI)
#define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
#define	inst_call(ins)		(((ins)&M_BC ) == I_BC  || \
				 ((ins)&M_B  ) == I_B )
#define inst_load(ins)		0
#define inst_store(ins)		0

#ifdef _KERNEL

void	kdb_kintr(void *);
int	kdb_trap(int, void *);
void	db_save_regs(struct trapframe *frame);
void	ddb_trap(void);
db_expr_t db_dumpframe(u_int32_t pframe, int (*pr)(const char *, ...));

#endif /* _KERNEL */

#endif	/* _PPC_DB_MACHDEP_H_ */