1 /* Generic MTRR (Memory Type Range Register) 1
2
3 Copyright (C) 1997-1999 Richard Gooch
4
5 This library is free software; you can red
6 modify it under the terms of the GNU Libra
7 License as published by the Free Software
8 version 2 of the License, or (at your opti
9
10 This library is distributed in the hope th
11 but WITHOUT ANY WARRANTY; without even the
12 MERCHANTABILITY or FITNESS FOR A PARTICULA
13 Library General Public License for more de
14
15 You should have received a copy of the GNU
16 License along with this library; if not, w
17 Software Foundation, Inc., 675 Mass Ave, C
18
19 Richard Gooch may be reached by email at
20 The postal address is:
21 Richard Gooch, c/o ATNF, P. O. Box 76, E
22 */
23 #ifndef _ASM_X86_MTRR_H
24 #define _ASM_X86_MTRR_H
25
26 #include <linux/bits.h>
27 #include <uapi/asm/mtrr.h>
28
29 /* Defines for hardware MTRR registers. */
30 #define MTRR_CAP_VCNT GENMASK(7, 0)
31 #define MTRR_CAP_FIX BIT_MASK(8)
32 #define MTRR_CAP_WC BIT_MASK(10)
33
34 #define MTRR_DEF_TYPE_TYPE GENMASK(7, 0)
35 #define MTRR_DEF_TYPE_FE BIT_MASK(10)
36 #define MTRR_DEF_TYPE_E BIT_MASK(11)
37
38 #define MTRR_DEF_TYPE_ENABLE (MTRR_DEF_TYPE
39 #define MTRR_DEF_TYPE_DISABLE ~(MTRR_DEF_TYP
40
41 #define MTRR_PHYSBASE_TYPE GENMASK(7, 0)
42 #define MTRR_PHYSBASE_RSVD GENMASK(11, 8)
43
44 #define MTRR_PHYSMASK_RSVD GENMASK(10, 0)
45 #define MTRR_PHYSMASK_V BIT_MASK(11)
46
47 struct mtrr_state_type {
48 struct mtrr_var_range var_ranges[MTRR_
49 mtrr_type fixed_ranges[MTRR_NUM_FIXED_
50 unsigned char enabled;
51 bool have_fixed;
52 mtrr_type def_type;
53 };
54
55 /*
56 * The following functions are for use by othe
57 * arch_phys_wc_add and arch_phys_wc_del.
58 */
59 # ifdef CONFIG_MTRR
60 void mtrr_bp_init(void);
61 void mtrr_overwrite_state(struct mtrr_var_rang
62 mtrr_type def_type);
63 extern u8 mtrr_type_lookup(u64 addr, u64 end,
64 extern void mtrr_save_fixed_ranges(void *);
65 extern void mtrr_save_state(void);
66 extern int mtrr_add(unsigned long base, unsign
67 unsigned int type, bool in
68 extern int mtrr_add_page(unsigned long base, u
69 unsigned int type, bo
70 extern int mtrr_del(int reg, unsigned long bas
71 extern int mtrr_del_page(int reg, unsigned lon
72 extern int mtrr_trim_uncached_memory(unsigned
73 extern int amd_special_default_mtrr(void);
74 void mtrr_disable(void);
75 void mtrr_enable(void);
76 void mtrr_generic_set_state(void);
77 # else
78 static inline void mtrr_overwrite_state(struct
79 unsign
80 mtrr_t
81 {
82 }
83
84 static inline u8 mtrr_type_lookup(u64 addr, u6
85 {
86 /*
87 * Return the default MTRR type, witho
88 * that range.
89 */
90 *uniform = 1;
91
92 return MTRR_TYPE_UNCACHABLE;
93 }
94 #define mtrr_save_fixed_ranges(arg) do {} whil
95 #define mtrr_save_state() do {} while (0)
96 static inline int mtrr_add(unsigned long base,
97 unsigned int type,
98 {
99 return -ENODEV;
100 }
101 static inline int mtrr_add_page(unsigned long
102 unsigned int t
103 {
104 return -ENODEV;
105 }
106 static inline int mtrr_del(int reg, unsigned l
107 {
108 return -ENODEV;
109 }
110 static inline int mtrr_del_page(int reg, unsig
111 {
112 return -ENODEV;
113 }
114 static inline int mtrr_trim_uncached_memory(un
115 {
116 return 0;
117 }
118 #define mtrr_bp_init() do {} while (0)
119 #define mtrr_disable() do {} while (0)
120 #define mtrr_enable() do {} while (0)
121 #define mtrr_generic_set_state() do {} while (
122 # endif
123
124 #ifdef CONFIG_COMPAT
125 #include <linux/compat.h>
126
127 struct mtrr_sentry32 {
128 compat_ulong_t base; /* Base address
129 compat_uint_t size; /* Size of region
130 compat_uint_t type; /* Type of region
131 };
132
133 struct mtrr_gentry32 {
134 compat_ulong_t regnum; /* Register numb
135 compat_uint_t base; /* Base address
136 compat_uint_t size; /* Size of region
137 compat_uint_t type; /* Type of region
138 };
139
140 #define MTRR_IOCTL_BASE 'M'
141
142 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOC
143 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOC
144 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOC
145 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IO
146 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOC
147 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOC
148 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOC
149 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOC
150 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IO
151 #define MTRRIOC32_KILL_PAGE_ENTRY
152 _IOW(MTRR_IOC
153 #endif /* CONFIG_COMPAT */
154
155 /* Bit fields for enabled in struct mtrr_state
156 #define MTRR_STATE_SHIFT 10
157 #define MTRR_STATE_MTRR_FIXED_ENABLED (MTRR_
158 #define MTRR_STATE_MTRR_ENABLED (MTRR_
159
160 #endif /* _ASM_X86_MTRR_H */
161
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