summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/mtrr.h
blob: fac2e58502763b830ea4bd9db2ce0b8c99ccf36c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/*
 * Generic MTRR (Memory Type Range Register) ioctls.
 * Taken from the Linux kernel
 *
 * (C) Copyright 2012
 * Graeme Russ, <graeme.russ@gmail.com>
 *
 * Copyright (C) 1997-1999  Richard Gooch <rgooch@atnf.csiro.au>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef _ASM_X86_MTRR_H
#define _ASM_X86_MTRR_H

#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)

#ifndef __ASSEMBLY__

#include <linux/types.h>
#include <linux/ioctl.h>
#include <errno.h>

#define	MTRR_IOCTL_BASE	'M'

struct mtrr_sentry {
	unsigned long base;	/*  Base address     */
	unsigned int size;	/*  Size of region   */
	unsigned int type;	/*  Type of region   */
};

/*
 * Warning: this structure has a different order from i386
 * on x86-64. The 32bit emulation code takes care of that.
 * But you need to use this for 64bit, otherwise your X server
 * will break.
 */

#ifdef __i386__
struct mtrr_gentry {
	unsigned int regnum;	/*  Register number  */
	unsigned long base;	/*  Base address     */
	unsigned int size;	/*  Size of region   */
	unsigned int type;	/*  Type of region   */
};

#else /* __i386__ */

struct mtrr_gentry {
	unsigned long base;	/*  Base address     */
	unsigned int size;	/*  Size of region   */
	unsigned int regnum;	/*  Register number  */
	unsigned int type;	/*  Type of region   */
};
#endif /* !__i386__ */

struct mtrr_var_range {
	__u32 base_lo;
	__u32 base_hi;
	__u32 mask_lo;
	__u32 mask_hi;
};

/*
 * In the Intel processor's MTRR interface, the MTRR type is always held in
 * an 8 bit field:
 */
typedef __u8 mtrr_type;

#define MTRR_NUM_FIXED_RANGES 88
#define MTRR_MAX_VAR_RANGES 256

struct mtrr_state_type {
	struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
	mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
	unsigned char enabled;
	unsigned char have_fixed;
	mtrr_type def_type;
};

/*  These are the various ioctls  */
#define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
#define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
#define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
#define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
#define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
#define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
#define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
#define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
#define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
#define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)

/*  These are the region types  */
#define MTRR_TYPE_UNCACHABLE 0
#define MTRR_TYPE_WRCOMB     1
/*#define MTRR_TYPE_         2*/
/*#define MTRR_TYPE_         3*/
#define MTRR_TYPE_WRTHROUGH  4
#define MTRR_TYPE_WRPROT     5
#define MTRR_TYPE_WRBACK     6
#define MTRR_NUM_TYPES       7

#ifdef __KERNEL__

/*  The following functions are for use by other drivers  */
# ifdef CONFIG_MTRR
extern u8 mtrr_type_lookup(u64 addr, u64 end);
extern void mtrr_save_fixed_ranges(void *);
extern void mtrr_save_state(void);
extern int mtrr_add(unsigned long base, unsigned long size,
		    unsigned int type, bool increment);
extern int mtrr_add_page(unsigned long base, unsigned long size,
			 unsigned int type, bool increment);
extern int mtrr_del(int reg, unsigned long base, unsigned long size);
extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
extern void mtrr_ap_init(void);
extern void mtrr_bp_init(void);
extern void set_mtrr_aps_delayed_init(void);
extern void mtrr_aps_init(void);
extern void mtrr_bp_restore(void);
extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
extern int amd_special_default_mtrr(void);
#  else
static inline u8 mtrr_type_lookup(u64 addr, u64 end)
{
	/*
	 * Return no-MTRRs:
	 */
	return 0xff;
}
#define mtrr_save_fixed_ranges(arg) do {} while (0)
#define mtrr_save_state() do {} while (0)
static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
{
	return -ENODEV;
}
static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
{
	return -ENODEV;
}
static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
{
	return 0;
}
static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
{
}

#define mtrr_ap_init() do {} while (0)
#define mtrr_bp_init() do {} while (0)
#define set_mtrr_aps_delayed_init() do {} while (0)
#define mtrr_aps_init() do {} while (0)
#define mtrr_bp_restore() do {} while (0)
#  endif

#ifdef CONFIG_COMPAT
#include <linux/compat.h>

struct mtrr_sentry32 {
	compat_ulong_t base;	/*  Base address     */
	compat_uint_t size;	/*  Size of region   */
	compat_uint_t type;	/*  Type of region   */
};

struct mtrr_gentry32 {
	compat_ulong_t regnum;	/*  Register number  */
	compat_uint_t base;	/*  Base address     */
	compat_uint_t size;	/*  Size of region   */
	compat_uint_t type;	/*  Type of region   */
};

#define MTRR_IOCTL_BASE 'M'

#define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
#define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
#define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
#define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
#define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
#define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
#define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
#define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
#define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
#define MTRRIOC32_KILL_PAGE_ENTRY		\
				 _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
#endif /* CONFIG_COMPAT */

#endif /* __KERNEL__ */

#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_MTRR_H */