devmap.h revision 257648 
1/*-
2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/arm/include/devmap.h 257648 2013-11-04 19:44:37Z ian $
27 */
28
29#ifndef	_MACHINE_DEVMAP_H_
30#define	_MACHINE_DEVMAP_H_
31
32/*
33 * Routines to translate between virtual and physical addresses within a region
34 * that is static-mapped by the devmap code.  If the given address range isn't
35 * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND.
36 * The latter implies that you can't vtop just the last byte of physical address
37 * space.  This is not as limiting as it might sound, because even if a device
38 * occupies the end of the physical address space, you're only prevented from
39 * doing vtop for that single byte.  If you vtop a size bigger than 1 it works.
40 */
41#define	DEVMAP_PADDR_NOTFOUND	((vm_paddr_t)(-1))
42
43void *     arm_devmap_ptov(vm_paddr_t _pa, vm_size_t _sz);
44vm_paddr_t arm_devmap_vtop(void * _va, vm_size_t _sz);
45
46#endif
47