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 <uapi/asm/mtrr.h>
27
28 /*
29 * The following functions are for use by other drivers that cannot use
30 * arch_phys_wc_add and arch_phys_wc_del.
31 */
32 # ifdef CONFIG_MTRR
33 void mtrr_bp_init(void);
34 extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform);
35 extern void mtrr_save_fixed_ranges(void *);
36 extern void mtrr_save_state(void);
37 extern int mtrr_add(unsigned long base, unsigned long size,
38 unsigned int type, bool increment);
39 extern int mtrr_add_page(unsigned long base, unsigned long size,
40 unsigned int type, bool increment);
41 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
42 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
43 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
44 extern void mtrr_bp_restore(void);
45 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
46 extern int amd_special_default_mtrr(void);
47 void mtrr_disable(void);
48 void mtrr_enable(void);
49 void mtrr_generic_set_state(void);
50 # else
mtrr_type_lookup(u64 addr,u64 end,u8 * uniform)51 static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform)
52 {
53 /*
54 * Return no-MTRRs:
55 */
56 return MTRR_TYPE_INVALID;
57 }
58 #define mtrr_save_fixed_ranges(arg) do {} while (0)
59 #define mtrr_save_state() do {} while (0)
mtrr_add(unsigned long base,unsigned long size,unsigned int type,bool increment)60 static inline int mtrr_add(unsigned long base, unsigned long size,
61 unsigned int type, bool increment)
62 {
63 return -ENODEV;
64 }
mtrr_add_page(unsigned long base,unsigned long size,unsigned int type,bool increment)65 static inline int mtrr_add_page(unsigned long base, unsigned long size,
66 unsigned int type, bool increment)
67 {
68 return -ENODEV;
69 }
mtrr_del(int reg,unsigned long base,unsigned long size)70 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
71 {
72 return -ENODEV;
73 }
mtrr_del_page(int reg,unsigned long base,unsigned long size)74 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
75 {
76 return -ENODEV;
77 }
mtrr_trim_uncached_memory(unsigned long end_pfn)78 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
79 {
80 return 0;
81 }
mtrr_centaur_report_mcr(int mcr,u32 lo,u32 hi)82 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
83 {
84 }
85 #define mtrr_bp_init() do {} while (0)
86 #define mtrr_bp_restore() do {} while (0)
87 #define mtrr_disable() do {} while (0)
88 #define mtrr_enable() do {} while (0)
89 #define mtrr_generic_set_state() do {} while (0)
90 # endif
91
92 #ifdef CONFIG_COMPAT
93 #include <linux/compat.h>
94
95 struct mtrr_sentry32 {
96 compat_ulong_t base; /* Base address */
97 compat_uint_t size; /* Size of region */
98 compat_uint_t type; /* Type of region */
99 };
100
101 struct mtrr_gentry32 {
102 compat_ulong_t regnum; /* Register number */
103 compat_uint_t base; /* Base address */
104 compat_uint_t size; /* Size of region */
105 compat_uint_t type; /* Type of region */
106 };
107
108 #define MTRR_IOCTL_BASE 'M'
109
110 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32)
111 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32)
112 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32)
113 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
114 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32)
115 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32)
116 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32)
117 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32)
118 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
119 #define MTRRIOC32_KILL_PAGE_ENTRY \
120 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32)
121 #endif /* CONFIG_COMPAT */
122
123 /* Bit fields for enabled in struct mtrr_state_type */
124 #define MTRR_STATE_MTRR_FIXED_ENABLED 0x01
125 #define MTRR_STATE_MTRR_ENABLED 0x02
126
127 #endif /* _ASM_X86_MTRR_H */
128