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Linux kernel mirror (for testing)
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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 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
33void mtrr_bp_init(void);
34extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform);
35extern void mtrr_save_fixed_ranges(void *);
36extern void mtrr_save_state(void);
37extern int mtrr_add(unsigned long base, unsigned long size,
38 unsigned int type, bool increment);
39extern int mtrr_add_page(unsigned long base, unsigned long size,
40 unsigned int type, bool increment);
41extern int mtrr_del(int reg, unsigned long base, unsigned long size);
42extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
43extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
44extern void mtrr_bp_restore(void);
45extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
46extern int amd_special_default_mtrr(void);
47void mtrr_disable(void);
48void mtrr_enable(void);
49void mtrr_generic_set_state(void);
50# else
51static 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)
60static inline int mtrr_add(unsigned long base, unsigned long size,
61 unsigned int type, bool increment)
62{
63 return -ENODEV;
64}
65static inline int mtrr_add_page(unsigned long base, unsigned long size,
66 unsigned int type, bool increment)
67{
68 return -ENODEV;
69}
70static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
71{
72 return -ENODEV;
73}
74static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
75{
76 return -ENODEV;
77}
78static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
79{
80 return 0;
81}
82static 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
95struct 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
101struct 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 */