1/* $NetBSD: sgmapvar.h,v 1.15 2008/04/28 20:23:11 martin Exp $ */
2
3/*-
4 * Copyright (c) 1997, 1998, 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#ifndef	_ALPHA_COMMON_SGMAPVAR_H
34#define	_ALPHA_COMMON_SGMAPVAR_H
35
36#include <sys/extent.h>
37#include <sys/bus.h>
38
39/*
40 * Bits n:13 of the DMA address are the index of the PTE into
41 * the SGMAP page table.
42 */
43#define	SGMAP_ADDR_PTEIDX_SHIFT	13
44
45/*
46 * An Alpha SGMAP's state information.  Nothing in the sgmap requires
47 * locking[*], with the exception of the extent map.  Locking of the
48 * extent map is handled within the extent manager itself.
49 *
50 * [*] While the page table is a `global' resource, access to it is
51 * controlled by the extent map; once a region has been allocated from
52 * the map, that region is effectively `locked'.
53 */
54struct alpha_sgmap {
55	struct extent *aps_ex;		/* extent map to manage sgva space */
56	void	*aps_pt;		/* page table */
57	bus_addr_t aps_ptpa;		/* page table physical address */
58	bus_addr_t aps_sgvabase;	/* base of the sgva space */
59	bus_size_t aps_sgvasize;	/* size of the sgva space */
60	bus_addr_t aps_wbase;		/* base of the DMA window */
61};
62
63extern	vaddr_t alpha_sgmap_prefetch_spill_page_va;
64extern	bus_addr_t alpha_sgmap_prefetch_spill_page_pa;
65
66void	alpha_sgmap_init(bus_dma_tag_t, struct alpha_sgmap *,
67	    const char *, bus_addr_t, bus_addr_t, bus_size_t, size_t, void *,
68	    bus_size_t);
69
70int	alpha_sgmap_dmamap_create(bus_dma_tag_t, bus_size_t, int,
71	    bus_size_t, bus_size_t, int, bus_dmamap_t *);
72void	alpha_sgmap_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
73
74#endif	/* _ALPHA_COMMON_SGMAPVAR_H */
75