1 /* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
2 /* Generic MTRR (Memory Type Range Register) ioctls.
3
4 Copyright (C) 1997-1999 Richard Gooch
5
6 This library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
10
11 This library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public
17 License along with this library; if not, write to the Free
18 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20 Richard Gooch may be reached by email at rgooch@atnf.csiro.au
21 The postal address is:
22 Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
23 */
24 #ifndef _UAPI_ASM_X86_MTRR_H
25 #define _UAPI_ASM_X86_MTRR_H
26
27 #include <linux/types.h>
28 #include <linux/ioctl.h>
29 #include <linux/errno.h>
30
31 #define MTRR_IOCTL_BASE 'M'
32
33 /* Warning: this structure has a different order from i386
34 on x86-64. The 32bit emulation code takes care of that.
35 But you need to use this for 64bit, otherwise your X server
36 will break. */
37
38 #ifdef __i386__
39 struct mtrr_sentry {
40 unsigned long base; /* Base address */
41 unsigned int size; /* Size of region */
42 unsigned int type; /* Type of region */
43 };
44
45 struct mtrr_gentry {
46 unsigned int regnum; /* Register number */
47 unsigned long base; /* Base address */
48 unsigned int size; /* Size of region */
49 unsigned int type; /* Type of region */
50 };
51
52 #else /* __i386__ */
53
54 struct mtrr_sentry {
55 __u64 base; /* Base address */
56 __u32 size; /* Size of region */
57 __u32 type; /* Type of region */
58 };
59
60 struct mtrr_gentry {
61 __u64 base; /* Base address */
62 __u32 size; /* Size of region */
63 __u32 regnum; /* Register number */
64 __u32 type; /* Type of region */
65 __u32 _pad; /* Unused */
66 };
67
68 #endif /* !__i386__ */
69
70 struct mtrr_var_range {
71 __u32 base_lo;
72 __u32 base_hi;
73 __u32 mask_lo;
74 __u32 mask_hi;
75 };
76
77 /* In the Intel processor's MTRR interface, the MTRR type is always held in
78 an 8 bit field: */
79 typedef __u8 mtrr_type;
80
81 #define MTRR_NUM_FIXED_RANGES 88
82 #define MTRR_MAX_VAR_RANGES 256
83
84 struct mtrr_state_type {
85 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
86 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
87 unsigned char enabled;
88 unsigned char have_fixed;
89 mtrr_type def_type;
90 };
91
92 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
93 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
94
95 /* These are the various ioctls */
96 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
97 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
98 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
99 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
100 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
101 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
102 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
103 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
104 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
105 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
106
107 /* MTRR memory types, which are defined in SDM */
108 #define MTRR_TYPE_UNCACHABLE 0
109 #define MTRR_TYPE_WRCOMB 1
110 /*#define MTRR_TYPE_ 2*/
111 /*#define MTRR_TYPE_ 3*/
112 #define MTRR_TYPE_WRTHROUGH 4
113 #define MTRR_TYPE_WRPROT 5
114 #define MTRR_TYPE_WRBACK 6
115 #define MTRR_NUM_TYPES 7
116
117 /*
118 * Invalid MTRR memory type. mtrr_type_lookup() returns this value when
119 * MTRRs are disabled. Note, this value is allocated from the reserved
120 * values (0x7-0xff) of the MTRR memory types.
121 */
122 #define MTRR_TYPE_INVALID 0xff
123
124 #endif /* _UAPI_ASM_X86_MTRR_H */