xref: /titanic_50/usr/src/psm/promif/ieee1275/sun4/prom_map.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1991-1994, by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/promif.h>
#include <sys/promimpl.h>

/*
 * Mapping routines suitable for implementations using 2-cell physical
 * address formats.  Use of these routines makes the caller
 * platform-dependent.  The implementation of these routines is
 * a bit sun-hardware centric, for historical use by SunOS and standalones.
 */

caddr_t
prom_map(caddr_t virthint, unsigned long long physaddr, u_int size)
{
	caddr_t virt;

	/*
	 * If no virthint, allocate it; otherwise claim it,
	 * the physical address is assumed to be a device or
	 * already claimed, or not appearing in a resource list.
	 */
	if (virthint == (caddr_t)0)  {
		if ((virt = prom_allocate_virt((u_int)1, size)) == 0)
			return ((caddr_t)0);
	} else {
		virt = virthint;
		if (prom_claim_virt(size, virt) != virt)
			return ((caddr_t)0);
	}

	if (prom_map_phys(-1, size, virt, physaddr) != 0) {
		/*
		 * The map operation failed, free the virtual
		 * addresses we allocated or claimed.
		 */
		(void) prom_free_virt(size, virt);
		return ((caddr_t)0);
	}
	return (virt);
}

void
prom_unmap(caddr_t virt, u_int size)
{
	(void) prom_unmap_virt(size, virt);
	prom_free_virt(size, virt);
}