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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 _UAPI_ASM_X86_MTRR_H
24 #define _UAPI_ASM_X86_MTRR_H
25 
26 #include <linux/types.h>
27 #include <linux/ioctl.h>
28 #include <linux/errno.h>
29 
30 #define	MTRR_IOCTL_BASE	'M'
31 
32 /* Warning: this structure has a different order from i386
33    on x86-64. The 32bit emulation code takes care of that.
34    But you need to use this for 64bit, otherwise your X server
35    will break. */
36 
37 #ifdef __i386__
38 struct mtrr_sentry {
39     unsigned long base;    /*  Base address     */
40     unsigned int size;    /*  Size of region   */
41     unsigned int type;     /*  Type of region   */
42 };
43 
44 struct mtrr_gentry {
45     unsigned int regnum;   /*  Register number  */
46     unsigned long base;    /*  Base address     */
47     unsigned int size;    /*  Size of region   */
48     unsigned int type;     /*  Type of region   */
49 };
50 
51 #else /* __i386__ */
52 
53 struct mtrr_sentry {
54 	__u64 base;		/*  Base address     */
55 	__u32 size;		/*  Size of region   */
56 	__u32 type;		/*  Type of region   */
57 };
58 
59 struct mtrr_gentry {
60 	__u64 base;		/*  Base address     */
61 	__u32 size;		/*  Size of region   */
62 	__u32 regnum;		/*  Register number  */
63 	__u32 type;		/*  Type of region   */
64 	__u32 _pad;		/*  Unused	     */
65 };
66 
67 #endif /* !__i386__ */
68 
69 struct mtrr_var_range {
70 	__u32 base_lo;
71 	__u32 base_hi;
72 	__u32 mask_lo;
73 	__u32 mask_hi;
74 };
75 
76 /* In the Intel processor's MTRR interface, the MTRR type is always held in
77    an 8 bit field: */
78 typedef __u8 mtrr_type;
79 
80 #define MTRR_NUM_FIXED_RANGES 88
81 #define MTRR_MAX_VAR_RANGES 256
82 
83 struct mtrr_state_type {
84 	struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
85 	mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
86 	unsigned char enabled;
87 	unsigned char have_fixed;
88 	mtrr_type def_type;
89 };
90 
91 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
92 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
93 
94 /*  These are the various ioctls  */
95 #define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
96 #define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
97 #define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
98 #define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
99 #define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
100 #define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
101 #define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
102 #define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
103 #define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
104 #define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)
105 
106 /* MTRR memory types, which are defined in SDM */
107 #define MTRR_TYPE_UNCACHABLE 0
108 #define MTRR_TYPE_WRCOMB     1
109 /*#define MTRR_TYPE_         2*/
110 /*#define MTRR_TYPE_         3*/
111 #define MTRR_TYPE_WRTHROUGH  4
112 #define MTRR_TYPE_WRPROT     5
113 #define MTRR_TYPE_WRBACK     6
114 #define MTRR_NUM_TYPES       7
115 
116 /*
117  * Invalid MTRR memory type.  mtrr_type_lookup() returns this value when
118  * MTRRs are disabled.  Note, this value is allocated from the reserved
119  * values (0x7-0xff) of the MTRR memory types.
120  */
121 #define MTRR_TYPE_INVALID    0xff
122 
123 #endif /* _UAPI_ASM_X86_MTRR_H */
124