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 int size; /* Size of region */
35 unsigned int type; /* Type of region */
36 };
37
38 struct mtrr_gentry
39 {
40 unsigned long base; /* Base address */
41 unsigned int size; /* Size of region */
42 unsigned int regnum; /* Register number */
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 #include <linux/types.h>
83
84 /* The following functions are for use by other drivers */
85 #ifdef CONFIG_MTRR
86 extern int mtrr_add (__u64 base, __u32 size, unsigned int type, char increment);
87 extern int mtrr_add_page (__u64 base, __u32 size, unsigned int type, char increment);
88 extern int mtrr_del (int reg, __u64 base, __u32 size);
89 extern int mtrr_del_page (int reg, __u64 base, __u32 size);
90 #else
mtrr_add(__u64 base,__u32 size,unsigned int type,char increment)91 static __inline__ int mtrr_add (__u64 base, __u32 size,
92 unsigned int type, char increment)
93 {
94 return -ENODEV;
95 }
mtrr_add_page(__u64 base,__u32 size,unsigned int type,char increment)96 static __inline__ int mtrr_add_page (__u64 base, __u32 size,
97 unsigned int type, char increment)
98 {
99 return -ENODEV;
100 }
mtrr_del(int reg,__u64 base,__u32 size)101 static __inline__ int mtrr_del (int reg, __u64 base, __u32 size)
102 {
103 return -ENODEV;
104 }
mtrr_del_page(int reg,__u64 base,__u32 size)105 static __inline__ int mtrr_del_page (int reg, __u64 base, __u32 size)
106 {
107 return -ENODEV;
108 }
109 #endif
110
111 /* The following functions are for initialisation: don't use them! */
112 extern int mtrr_init (void);
113 #if defined(CONFIG_SMP) && defined(CONFIG_MTRR)
114 extern void mtrr_init_boot_cpu (void);
115 extern void mtrr_init_secondary_cpu (void);
116 #endif
117
118 #endif
119
120 #endif /* _LINUX_MTRR_H */
121