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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: aapic.c,v 1.3 2007/01/15 23:19:05 jsg Exp $	*/
/* 	$NetBSD: aapic.c,v 1.3 2005/01/13 23:40:01 fvdl Exp $	*/

/*
 * The AMD 8131 IO APIC can hang the box when an APIC IRQ is masked.
 */

#if 0
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: aapic.c,v 1.3 2005/01/13 23:40:01 fvdl Exp $");
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>

#include <arch/amd64/pci/amd8131reg.h>

#include "ioapic.h"

#if NIOAPIC > 0
extern int nioapics;
#endif

int	aapic_match(struct device *, void *, void *);
void	aapic_attach(struct device *, struct device *, void *);

struct aapic_softc {
	struct device sc_dev;
};

struct cfattach aapic_ca = {
	sizeof(struct aapic_softc), aapic_match, aapic_attach
};

struct cfdriver aapic_cd = {
	0, "aapic", DV_DULL
};

int
aapic_match(struct device *parent, void *match, void *aux)
{
	struct pci_attach_args *pa = aux;

	if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD &&
	    PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_8131_PCIX_IOAPIC)
		return (1);

	return (0);
}

void
aapic_attach(struct device *parent, struct device *self, void *aux)
{
	struct pci_attach_args *pa = aux;
	int bus, dev, func;
	pcitag_t tag;
	pcireg_t reg;

	printf("\n");

#if NIOAPIC > 0
	if (nioapics == 0)
		return;
#else
	return;
#endif
	
	reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMD8131_IOAPIC_CTL);
	reg |= AMD8131_IOAEN;
	pci_conf_write(pa->pa_pc, pa->pa_tag, AMD8131_IOAPIC_CTL, reg);

	pci_decompose_tag(pa->pa_pc, pa->pa_tag, &bus, &dev, &func);
	func = 0;
	tag = pci_make_tag(pa->pa_pc, bus, dev, func);
	reg = pci_conf_read(pa->pa_pc, tag, AMD8131_PCIX_MISC);
	reg &= ~AMD8131_NIOAMODE;
	pci_conf_write(pa->pa_pc, tag, AMD8131_PCIX_MISC, reg);
}