1 /* Generic MTRR (Memory Type Range Register) ioctls.
2
3 Copyright (C) 1997-1999 Richard Gooch
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18
19 Richard Gooch may be reached by email at rgooch@atnf.csiro.au
20 The postal address is:
21 Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
22 */
23 #ifndef _LINUX_MTRR_H
24 #define _LINUX_MTRR_H
25
26 #include <linux/config.h>
27 #include <linux/ioctl.h>
28
29 #define MTRR_IOCTL_BASE 'M'
30
31 struct mtrr_sentry
32 {
33 unsigned long base; /* Base address */
34 unsigned long size; /* Size of region */
35 unsigned int type; /* Type of region */
36 };
37
38 struct mtrr_gentry
39 {
40 unsigned int regnum; /* Register number */
41 unsigned long base; /* Base address */
42 unsigned long size; /* Size of region */
43 unsigned int type; /* Type of region */
44 };
45
46 /* These are the various ioctls */
47 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
48 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
49 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
50 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
51 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
52 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
53 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
54 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
55 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
56 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
57
58 /* These are the region types */
59 #define MTRR_TYPE_UNCACHABLE 0
60 #define MTRR_TYPE_WRCOMB 1
61 /*#define MTRR_TYPE_ 2*/
62 /*#define MTRR_TYPE_ 3*/
63 #define MTRR_TYPE_WRTHROUGH 4
64 #define MTRR_TYPE_WRPROT 5
65 #define MTRR_TYPE_WRBACK 6
66 #define MTRR_NUM_TYPES 7
67
68 #ifdef MTRR_NEED_STRINGS
69 static char *mtrr_strings[MTRR_NUM_TYPES] =
70 {
71 "uncachable", /* 0 */
72 "write-combining", /* 1 */
73 "?", /* 2 */
74 "?", /* 3 */
75 "write-through", /* 4 */
76 "write-protect", /* 5 */
77 "write-back", /* 6 */
78 };
79 #endif
80
81 #ifdef __KERNEL__
82
83 /* The following functions are for use by other drivers */
84 # ifdef CONFIG_MTRR
85 extern int mtrr_add (unsigned long base, unsigned long size,
86 unsigned int type, char increment);
87 extern int mtrr_add_page (unsigned long base, unsigned long size,
88 unsigned int type, char increment);
89 extern int mtrr_del (int reg, unsigned long base, unsigned long size);
90 extern int mtrr_del_page (int reg, unsigned long base, unsigned long size);
91 # else
92 static __inline__ int mtrr_add (unsigned long base, unsigned long size,
93 unsigned int type, char increment)
94 {
95 return -ENODEV;
96 }
97 static __inline__ int mtrr_add_page (unsigned long base, unsigned long size,
98 unsigned int type, char increment)
99 {
100 return -ENODEV;
101 }
102 static __inline__ int mtrr_del (int reg, unsigned long base,
103 unsigned long size)
104 {
105 return -ENODEV;
106 }
107 static __inline__ int mtrr_del_page (int reg, unsigned long base,
108 unsigned long size)
109 {
110 return -ENODEV;
111 }
112 # endif
113
114 /* The following functions are for initialisation: don't use them! */
115 extern int mtrr_init (void);
116 # if defined(CONFIG_SMP) && defined(CONFIG_MTRR)
117 extern void mtrr_init_boot_cpu (void);
118 extern void mtrr_init_secondary_cpu (void);
119 # endif
120
121 #endif
122
123 #endif /* _LINUX_MTRR_H */
124
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