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Heads up! Implement universal device attachment and autoconfiguration machinery.
This is somewhat similar to traditional BSD autoconf but much more simple.
Three basic data structures involved in autoconfiguration process are:
struct device, which represents abstract device and its private (driver softc) data;
struct driver, which holds {attach,match,detach} entries, name and softc size;
struct attachment, which tells us how drivers are interacted with each other.
Attachment basically describes how to attach devices in system.
Machine specified part should export arrays config_table[] and *drivers[] for config.

This might have broken i386 & gba tree, but there is only a question of time.

/*
 * $Id: config_alloc.c,v 1.1 2008/08/08 12:37:11 nbrk Exp $
 */
/*
 * Allocate and initialize new device structure.
 */
#include <driver.h>

struct device
*config_alloc_device(struct driver *drv)
{
	struct device	*devp;

	/* device itself */
	devp = kmem_alloc(sizeof(struct device));
	if (devp == NULL)
		panic("config: can't allocate memory for device");

	/* device data */
	if (drv->dr_datasize != 0) {
		/* XXX page_alloc() ? */
		devp->dv_data = kmem_alloc(drv->dr_datasize);
		if (devp->dv_data == NULL)
			panic("config: can't allocate memory dor device data");
	}

	devp->dv_xname = drv->dr_name;

	/* will be changed by config later */
	devp->dv_unit = 0;
	devp->dv_flags = 0;	/* XXX */
	devp->dv_parent = NULL;

	return(devp);
}


void
config_free_device(struct device *devp)
{
	kmem_free(devp->dv_data);
	kmem_free(devp);
}