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