mtrr.h revision 0437c52788a98ab8ea84041c6b1f8d7a93e872f6 
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__
38struct mtrr_sentry {
39    unsigned long base;    /*  Base address     */
40    unsigned int size;    /*  Size of region   */
41    unsigned int type;     /*  Type of region   */
42};
43
44struct 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
53struct mtrr_sentry {
54	__u64 base;		/*  Base address     */
55	__u32 size;		/*  Size of region   */
56	__u32 type;		/*  Type of region   */
57};
58
59struct 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
69struct 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: */
78typedef __u8 mtrr_type;
79
80#define MTRR_NUM_FIXED_RANGES 88
81#define MTRR_MAX_VAR_RANGES 256
82
83struct 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/*  These are the region types  */
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#endif /* _UAPI_ASM_X86_MTRR_H */
118