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mtrr.h
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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 [email protected]
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/types.h>
27 #include <linux/ioctl.h>
28 #include <linux/errno.h>
29 
30 #define MTRR_IOCTL_BASE 'M'
31 
32 /* Warning: this structure has a different order from i386
33  on x86-64. The 32bit emulation code takes care of that.
34  But you need to use this for 64bit, otherwise your X server
35  will break. */
36 
37 #ifdef __i386__
38 struct mtrr_sentry {
39  unsigned long base; /* Base address */
40  unsigned int size; /* Size of region */
41  unsigned int type; /* Type of region */
42 };
43 
44 struct mtrr_gentry {
45  unsigned int regnum; /* Register number */
46  unsigned long base; /* Base address */
47  unsigned int size; /* Size of region */
48  unsigned int type; /* Type of region */
49 };
50 
51 #else /* __i386__ */
52 
53 struct mtrr_sentry {
54  __u64 base; /* Base address */
55  __u32 size; /* Size of region */
56  __u32 type; /* Type of region */
57 };
58 
59 struct mtrr_gentry {
60  __u64 base; /* Base address */
61  __u32 size; /* Size of region */
62  __u32 regnum; /* Register number */
63  __u32 type; /* Type of region */
64  __u32 _pad; /* Unused */
65 };
66 
67 #endif /* !__i386__ */
68 
69 struct mtrr_var_range {
70  __u32 base_lo;
71  __u32 base_hi;
72  __u32 mask_lo;
73  __u32 mask_hi;
74 };
75 
76 /* In the Intel processor's MTRR interface, the MTRR type is always held in
77  an 8 bit field: */
78 typedef __u8 mtrr_type;
79 
80 #define MTRR_NUM_FIXED_RANGES 88
81 #define MTRR_MAX_VAR_RANGES 256
82 
83 struct mtrr_state_type {
84  struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
85  mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
86  unsigned char enabled;
87  unsigned char have_fixed;
88  mtrr_type def_type;
89 };
90 
91 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
92 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
93 
94 /* These are the various ioctls */
95 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
96 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
97 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
98 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
99 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
100 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
101 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
102 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
103 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
104 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
105 
106 /* These are the region types */
107 #define MTRR_TYPE_UNCACHABLE 0
108 #define MTRR_TYPE_WRCOMB 1
109 /*#define MTRR_TYPE_ 2*/
110 /*#define MTRR_TYPE_ 3*/
111 #define MTRR_TYPE_WRTHROUGH 4
112 #define MTRR_TYPE_WRPROT 5
113 #define MTRR_TYPE_WRBACK 6
114 #define MTRR_NUM_TYPES 7
115 
116 #ifdef __KERNEL__
117 
118 /* The following functions are for use by other drivers */
119 # ifdef CONFIG_MTRR
120 extern u8 mtrr_type_lookup(u64 addr, u64 end);
121 extern void mtrr_save_fixed_ranges(void *);
122 extern void mtrr_save_state(void);
123 extern int mtrr_add(unsigned long base, unsigned long size,
124  unsigned int type, bool increment);
125 extern int mtrr_add_page(unsigned long base, unsigned long size,
126  unsigned int type, bool increment);
127 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
128 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
129 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
130 extern void mtrr_ap_init(void);
131 extern void mtrr_bp_init(void);
132 extern void set_mtrr_aps_delayed_init(void);
133 extern void mtrr_aps_init(void);
134 extern void mtrr_bp_restore(void);
135 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
136 extern int amd_special_default_mtrr(void);
137 # else
138 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
139 {
140  /*
141  * Return no-MTRRs:
142  */
143  return 0xff;
144 }
145 #define mtrr_save_fixed_ranges(arg) do {} while (0)
146 #define mtrr_save_state() do {} while (0)
147 static inline int mtrr_add(unsigned long base, unsigned long size,
148  unsigned int type, bool increment)
149 {
150  return -ENODEV;
151 }
152 static inline int mtrr_add_page(unsigned long base, unsigned long size,
153  unsigned int type, bool increment)
154 {
155  return -ENODEV;
156 }
157 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
158 {
159  return -ENODEV;
160 }
161 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
162 {
163  return -ENODEV;
164 }
165 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
166 {
167  return 0;
168 }
169 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
170 {
171 }
172 
173 #define mtrr_ap_init() do {} while (0)
174 #define mtrr_bp_init() do {} while (0)
175 #define set_mtrr_aps_delayed_init() do {} while (0)
176 #define mtrr_aps_init() do {} while (0)
177 #define mtrr_bp_restore() do {} while (0)
178 # endif
179 
180 #ifdef CONFIG_COMPAT
181 #include <linux/compat.h>
182 
183 struct mtrr_sentry32 {
184  compat_ulong_t base; /* Base address */
185  compat_uint_t size; /* Size of region */
186  compat_uint_t type; /* Type of region */
187 };
188 
189 struct mtrr_gentry32 {
190  compat_ulong_t regnum; /* Register number */
191  compat_uint_t base; /* Base address */
192  compat_uint_t size; /* Size of region */
193  compat_uint_t type; /* Type of region */
194 };
195 
196 #define MTRR_IOCTL_BASE 'M'
197 
198 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32)
199 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32)
200 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32)
201 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
202 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32)
203 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32)
204 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32)
205 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32)
206 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
207 #define MTRRIOC32_KILL_PAGE_ENTRY \
208  _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32)
209 #endif /* CONFIG_COMPAT */
210 
211 #endif /* __KERNEL__ */
212 
213 #endif /* _ASM_X86_MTRR_H */
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