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 _ASM_X86_MTRR_H
24 #define _ASM_X86_MTRR_H
25
26 #include <linux/ioctl.h>
27 #include <linux/errno.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 /* Warning: this structure has a different order from i386
39 on x86-64. The 32bit emulation code takes care of that.
40 But you need to use this for 64bit, otherwise your X server
41 will break. */
42
43 #ifdef __i386__
44 struct mtrr_gentry
45 {
46 unsigned int regnum; /* Register number */
47 unsigned long base; /* Base address */
48 unsigned int size; /* Size of region */
49 unsigned int type; /* Type of region */
50 };
51
52 #else /* __i386__ */
53
54 struct mtrr_gentry
55 {
56 unsigned long base; /* Base address */
57 unsigned int size; /* Size of region */
58 unsigned int regnum; /* Register number */
59 unsigned int type; /* Type of region */
60 };
61 #endif /* !__i386__ */
62
63 /* These are the various ioctls */
64 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
65 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
66 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
67 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
68 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
69 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
70 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
71 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
72 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
73 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
74
75 /* These are the region types */
76 #define MTRR_TYPE_UNCACHABLE 0
77 #define MTRR_TYPE_WRCOMB 1
78 /*#define MTRR_TYPE_ 2*/
79 /*#define MTRR_TYPE_ 3*/
80 #define MTRR_TYPE_WRTHROUGH 4
81 #define MTRR_TYPE_WRPROT 5
82 #define MTRR_TYPE_WRBACK 6
83 #define MTRR_NUM_TYPES 7
84
85 #ifdef __KERNEL__
86
87 /* The following functions are for use by other drivers */
88 # ifdef CONFIG_MTRR
89 extern void mtrr_save_fixed_ranges(void *);
90 extern void mtrr_save_state(void);
91 extern int mtrr_add (unsigned long base, unsigned long size,
92 unsigned int type, bool increment);
93 extern int mtrr_add_page (unsigned long base, unsigned long size,
94 unsigned int type, bool increment);
95 extern int mtrr_del (int reg, unsigned long base, unsigned long size);
96 extern int mtrr_del_page (int reg, unsigned long base, unsigned long size);
97 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
98 extern void mtrr_ap_init(void);
99 extern void mtrr_bp_init(void);
100 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
101 # else
102 #define mtrr_save_fixed_ranges(arg) do {} while (0)
103 #define mtrr_save_state() do {} while (0)
104 static __inline__ int mtrr_add (unsigned long base, unsigned long size,
105 unsigned int type, bool increment)
106 {
107 return -ENODEV;
108 }
109 static __inline__ int mtrr_add_page (unsigned long base, unsigned long size,
110 unsigned int type, bool increment)
111 {
112 return -ENODEV;
113 }
114 static __inline__ int mtrr_del (int reg, unsigned long base,
115 unsigned long size)
116 {
117 return -ENODEV;
118 }
119 static __inline__ int mtrr_del_page (int reg, unsigned long base,
120 unsigned long size)
121 {
122 return -ENODEV;
123 }
124 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
125 {
126 return 0;
127 }
128 static __inline__ void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) {;}
129
130 #define mtrr_ap_init() do {} while (0)
131 #define mtrr_bp_init() do {} while (0)
132 # endif
133
134 #ifdef CONFIG_COMPAT
135 #include <linux/compat.h>
136
137 struct mtrr_sentry32
138 {
139 compat_ulong_t base; /* Base address */
140 compat_uint_t size; /* Size of region */
141 compat_uint_t type; /* Type of region */
142 };
143
144 struct mtrr_gentry32
145 {
146 compat_ulong_t regnum; /* Register number */
147 compat_uint_t base; /* Base address */
148 compat_uint_t size; /* Size of region */
149 compat_uint_t type; /* Type of region */
150 };
151
152 #define MTRR_IOCTL_BASE 'M'
153
154 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32)
155 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32)
156 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32)
157 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
158 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32)
159 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32)
160 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32)
161 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32)
162 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
163 #define MTRRIOC32_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32)
164 #endif /* CONFIG_COMPAT */
165
166 #endif /* __KERNEL__ */
167
168 #endif /* _ASM_X86_MTRR_H */
169
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