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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: pcdisplayvar.h,v 1.9 2007/02/11 20:29:22 miod Exp $ */
/* $NetBSD: pcdisplayvar.h,v 1.8 2000/01/25 02:44:03 ad Exp $ */

/*
 * Copyright (c) 1998
 *	Matthias Drochner.  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 AUTHOR ``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 AUTHOR 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.
 *
 */

struct pcdisplayscreen {
	struct pcdisplay_handle *hdl;

	const struct wsscreen_descr *type;

	int active;		/* currently displayed */
	u_int16_t *mem;		/* backing store for contents */

	int cursoron;		/* cursor displayed? */
#ifdef PCDISPLAY_SOFTCURSOR
	int cursortmp;		/* glyph & attribute behind software cursor */
#endif
	int vc_ccol, vc_crow;	/* current cursor position */

	int dispoffset;		/* offset of displayed area in video mem */
	int visibleoffset;
};

struct pcdisplay_handle {
	bus_space_tag_t	ph_iot, ph_memt;
	bus_space_handle_t ph_ioh_6845, ph_memh;
};

static inline u_int8_t _pcdisplay_6845_read(struct pcdisplay_handle *,
						 int);
static inline void _pcdisplay_6845_write(struct pcdisplay_handle *,
					      int, u_int8_t);

static inline u_int8_t _pcdisplay_6845_read(ph, reg)
	struct pcdisplay_handle *ph;
	int reg;
{
	bus_space_write_1(ph->ph_iot, ph->ph_ioh_6845, MC6845_INDEX, reg);
	return (bus_space_read_1(ph->ph_iot, ph->ph_ioh_6845, MC6845_DATA));
}

static inline void _pcdisplay_6845_write(ph, reg, val)
	struct pcdisplay_handle *ph;
	int reg;
	u_int8_t val;
{
	bus_space_write_1(ph->ph_iot, ph->ph_ioh_6845, MC6845_INDEX, reg);
	bus_space_write_1(ph->ph_iot, ph->ph_ioh_6845, MC6845_DATA, val);
}

#define pcdisplay_6845_read(ph, reg) \
	_pcdisplay_6845_read(ph, offsetof(struct reg_mc6845, reg))
#define pcdisplay_6845_write(ph, reg, val) \
	_pcdisplay_6845_write(ph, offsetof(struct reg_mc6845, reg), val)

void	pcdisplay_cursor_init(struct pcdisplayscreen *, int);
void	pcdisplay_cursor_reset(struct pcdisplayscreen *);
void	pcdisplay_cursor(void *, int, int, int);
#if 0
unsigned int pcdisplay_mapchar_simple(void *, int);
#endif
int pcdisplay_mapchar(void *, int, unsigned int *);
void	pcdisplay_putchar(void *, int, int, u_int, long);
struct wsdisplay_charcell;
int	pcdisplay_getchar(void *, int, int, struct wsdisplay_charcell *);
void	pcdisplay_copycols(void *, int, int, int,int);
void	pcdisplay_erasecols(void *, int, int, int, long);
void	pcdisplay_copyrows(void *, int, int, int);
void	pcdisplay_eraserows(void *, int, int, long);