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Thomas Gleixner297a99e2007-10-23 22:37:24 +02001/* 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*/
H. Peter Anvin1965aae2008-10-22 22:26:29 -070023#ifndef _ASM_X86_MTRR_H
24#define _ASM_X86_MTRR_H
Thomas Gleixner297a99e2007-10-23 22:37:24 +020025
26#include <linux/ioctl.h>
27#include <linux/errno.h>
28
29#define MTRR_IOCTL_BASE 'M'
30
Joe Perches9969b442008-03-23 01:02:52 -070031struct mtrr_sentry {
Thomas Gleixner297a99e2007-10-23 22:37:24 +020032 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__
Joe Perches9969b442008-03-23 01:02:52 -070043struct mtrr_gentry {
Thomas Gleixner297a99e2007-10-23 22:37:24 +020044 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
Joe Perches9969b442008-03-23 01:02:52 -070052struct mtrr_gentry {
Thomas Gleixner297a99e2007-10-23 22:37:24 +020053 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
Sheng Yang932d27a2008-10-09 16:01:53 +080060struct mtrr_var_range {
61 u32 base_lo;
62 u32 base_hi;
63 u32 mask_lo;
64 u32 mask_hi;
65};
66
67/* In the Intel processor's MTRR interface, the MTRR type is always held in
68 an 8 bit field: */
69typedef u8 mtrr_type;
70
71#define MTRR_NUM_FIXED_RANGES 88
72#define MTRR_MAX_VAR_RANGES 256
73
74struct mtrr_state_type {
75 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
76 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
77 unsigned char enabled;
78 unsigned char have_fixed;
79 mtrr_type def_type;
80};
81
82#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
83#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
84
Thomas Gleixner297a99e2007-10-23 22:37:24 +020085/* These are the various ioctls */
86#define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
87#define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
88#define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
89#define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
90#define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
91#define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
92#define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
93#define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
94#define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
95#define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
96
97/* These are the region types */
98#define MTRR_TYPE_UNCACHABLE 0
99#define MTRR_TYPE_WRCOMB 1
100/*#define MTRR_TYPE_ 2*/
101/*#define MTRR_TYPE_ 3*/
102#define MTRR_TYPE_WRTHROUGH 4
103#define MTRR_TYPE_WRPROT 5
104#define MTRR_TYPE_WRBACK 6
105#define MTRR_NUM_TYPES 7
106
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200107#ifdef __KERNEL__
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200108
109/* The following functions are for use by other drivers */
110# ifdef CONFIG_MTRR
Ingo Molnar52783fa2008-03-21 15:42:28 +0100111extern u8 mtrr_type_lookup(u64 addr, u64 end);
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200112extern void mtrr_save_fixed_ranges(void *);
113extern void mtrr_save_state(void);
Joe Perches9969b442008-03-23 01:02:52 -0700114extern int mtrr_add(unsigned long base, unsigned long size,
115 unsigned int type, bool increment);
116extern int mtrr_add_page(unsigned long base, unsigned long size,
117 unsigned int type, bool increment);
118extern int mtrr_del(int reg, unsigned long base, unsigned long size);
119extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200120extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
121extern void mtrr_ap_init(void);
122extern void mtrr_bp_init(void);
Jesse Barnes99fc8d42008-01-30 13:33:18 +0100123extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
Yinghai Lu35605a12008-03-24 16:02:01 -0700124extern int amd_special_default_mtrr(void);
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200125# else
Ingo Molnar52783fa2008-03-21 15:42:28 +0100126static inline u8 mtrr_type_lookup(u64 addr, u64 end)
127{
128 /*
129 * Return no-MTRRs:
130 */
131 return 0xff;
132}
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200133#define mtrr_save_fixed_ranges(arg) do {} while (0)
134#define mtrr_save_state() do {} while (0)
Joe Perches9969b442008-03-23 01:02:52 -0700135static inline int mtrr_add(unsigned long base, unsigned long size,
136 unsigned int type, bool increment)
137{
138 return -ENODEV;
139}
140static inline int mtrr_add_page(unsigned long base, unsigned long size,
Paul Jimenez2d2ee8d2008-01-30 13:30:31 +0100141 unsigned int type, bool increment)
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200142{
143 return -ENODEV;
144}
Joe Perches9969b442008-03-23 01:02:52 -0700145static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200146{
147 return -ENODEV;
148}
Joe Perches9969b442008-03-23 01:02:52 -0700149static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200150{
151 return -ENODEV;
152}
Jesse Barnes99fc8d42008-01-30 13:33:18 +0100153static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
154{
155 return 0;
156}
Joe Perches9969b442008-03-23 01:02:52 -0700157static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
158{
159}
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200160
161#define mtrr_ap_init() do {} while (0)
162#define mtrr_bp_init() do {} while (0)
163# endif
164
165#ifdef CONFIG_COMPAT
166#include <linux/compat.h>
167
Joe Perches9969b442008-03-23 01:02:52 -0700168struct mtrr_sentry32 {
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200169 compat_ulong_t base; /* Base address */
170 compat_uint_t size; /* Size of region */
171 compat_uint_t type; /* Type of region */
172};
173
Joe Perches9969b442008-03-23 01:02:52 -0700174struct mtrr_gentry32 {
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200175 compat_ulong_t regnum; /* Register number */
176 compat_uint_t base; /* Base address */
177 compat_uint_t size; /* Size of region */
178 compat_uint_t type; /* Type of region */
179};
180
181#define MTRR_IOCTL_BASE 'M'
182
Joe Perches9969b442008-03-23 01:02:52 -0700183#define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32)
184#define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32)
185#define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32)
186#define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
187#define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32)
188#define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32)
189#define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32)
190#define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32)
191#define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
192#define MTRRIOC32_KILL_PAGE_ENTRY \
193 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32)
Thomas Gleixner297a99e2007-10-23 22:37:24 +0200194#endif /* CONFIG_COMPAT */
195
196#endif /* __KERNEL__ */
197
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700198#endif /* _ASM_X86_MTRR_H */