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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 <linux/ioctl.h>
27#include <linux/errno.h>
28
29#define MTRR_IOCTL_BASE 'M'
30
31struct mtrr_sentry {
32 unsigned long base; /* Base address */
33 unsigned int size; /* Size of region */
34 unsigned int type; /* Type of region */
35};
36
37/* Warning: this structure has a different order from i386
38 on x86-64. The 32bit emulation code takes care of that.
39 But you need to use this for 64bit, otherwise your X server
40 will break. */
41
42#ifdef __i386__
43struct mtrr_gentry {
44 unsigned int regnum; /* Register number */
45 unsigned long base; /* Base address */
46 unsigned int size; /* Size of region */
47 unsigned int type; /* Type of region */
48};
49
50#else /* __i386__ */
51
52struct mtrr_gentry {
53 unsigned long base; /* Base address */
54 unsigned int size; /* Size of region */
55 unsigned int regnum; /* Register number */
56 unsigned int type; /* Type of region */
57};
58#endif /* !__i386__ */
59
60/* These are the various ioctls */
61#define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
62#define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
63#define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
64#define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
65#define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
66#define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
67#define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
68#define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
69#define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
70#define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
71
72/* These are the region types */
73#define MTRR_TYPE_UNCACHABLE 0
74#define MTRR_TYPE_WRCOMB 1
75/*#define MTRR_TYPE_ 2*/
76/*#define MTRR_TYPE_ 3*/
77#define MTRR_TYPE_WRTHROUGH 4
78#define MTRR_TYPE_WRPROT 5
79#define MTRR_TYPE_WRBACK 6
80#define MTRR_NUM_TYPES 7
81
82#ifdef __KERNEL__
83
84/* The following functions are for use by other drivers */
85# ifdef CONFIG_MTRR
86extern u8 mtrr_type_lookup(u64 addr, u64 end);
87extern void mtrr_save_fixed_ranges(void *);
88extern void mtrr_save_state(void);
89extern int mtrr_add(unsigned long base, unsigned long size,
90 unsigned int type, bool increment);
91extern int mtrr_add_page(unsigned long base, unsigned long size,
92 unsigned int type, bool increment);
93extern int mtrr_del(int reg, unsigned long base, unsigned long size);
94extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
95extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
96extern void mtrr_ap_init(void);
97extern void mtrr_bp_init(void);
98extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
99extern int amd_special_default_mtrr(void);
100# else
101static inline u8 mtrr_type_lookup(u64 addr, u64 end)
102{
103 /*
104 * Return no-MTRRs:
105 */
106 return 0xff;
107}
108#define mtrr_save_fixed_ranges(arg) do {} while (0)
109#define mtrr_save_state() do {} while (0)
110static inline int mtrr_add(unsigned long base, unsigned long size,
111 unsigned int type, bool increment)
112{
113 return -ENODEV;
114}
115static inline int mtrr_add_page(unsigned long base, unsigned long size,
116 unsigned int type, bool increment)
117{
118 return -ENODEV;
119}
120static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
121{
122 return -ENODEV;
123}
124static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
125{
126 return -ENODEV;
127}
128static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
129{
130 return 0;
131}
132static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
133{
134}
135
136#define mtrr_ap_init() do {} while (0)
137#define mtrr_bp_init() do {} while (0)
138# endif
139
140#ifdef CONFIG_COMPAT
141#include <linux/compat.h>
142
143struct mtrr_sentry32 {
144 compat_ulong_t base; /* Base address */
145 compat_uint_t size; /* Size of region */
146 compat_uint_t type; /* Type of region */
147};
148
149struct mtrr_gentry32 {
150 compat_ulong_t regnum; /* Register number */
151 compat_uint_t base; /* Base address */
152 compat_uint_t size; /* Size of region */
153 compat_uint_t type; /* Type of region */
154};
155
156#define MTRR_IOCTL_BASE 'M'
157
158#define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32)
159#define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32)
160#define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32)
161#define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
162#define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32)
163#define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32)
164#define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32)
165#define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32)
166#define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
167#define MTRRIOC32_KILL_PAGE_ENTRY \
168 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32)
169#endif /* CONFIG_COMPAT */
170
171#endif /* __KERNEL__ */
172
173#endif /* _ASM_X86_MTRR_H */