xref: /netbsd-src/sys/external/bsd/drm2/include/asm/mtrr.h (revision b7b7574d3bf8eeb51a1fa3977b59142ec6434a55)
1 /*	$NetBSD: mtrr.h,v 1.2 2014/03/18 18:20:42 riastradh Exp $	*/
2 
3 /*-
4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Taylor R. Campbell.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #ifndef _ASM_MTRR_H_
33 #define _ASM_MTRR_H_
34 
35 #ifdef _KERNEL_OPT
36 #include "opt_mtrr.h"
37 #endif
38 
39 #include <machine/mtrr.h>
40 
41 #define	MTRR_TYPE_WRCOMB	MTRR_TYPE_WC
42 
43 static inline int
44 mtrr_add(unsigned long base, unsigned long size, int type,
45     bool increment __unused)
46 {
47 #ifdef MTRR
48 	struct mtrr mtrr;
49 	int n = 1;
50 
51 	mtrr.base = base;
52 	mtrr.len = size;
53 	mtrr.type = type;
54 	mtrr.flags = MTRR_VALID;
55 
56 	/* XXX errno NetBSD->Linux */
57 	return -mtrr_set(&mtrr, &n, NULL, MTRR_GETSET_KERNEL);
58 #else
59 	return 0;
60 #endif
61 }
62 
63 static inline int
64 mtrr_del(int handle __unused, unsigned long base, unsigned long size)
65 {
66 #ifdef MTRR
67 	struct mtrr mtrr;
68 	int n = 1;
69 
70 	mtrr.base = base;
71 	mtrr.len = size;
72 	mtrr.type = 0;
73 	mtrr.flags = 0;		/* not MTRR_VALID */
74 
75 	/* XXX errno NetBSD->Linux */
76 	return -mtrr_set(&mtrr, &n, NULL, MTRR_GETSET_KERNEL);
77 #else
78 	return 0;
79 #endif
80 }
81 
82 #endif  /* _ASM_MTRR_H_ */
83