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 _ASM_X86_MTRR_H
24#define _ASM_X86_MTRR_H
25
26#include <uapi/asm/mtrr.h>
27#include <asm/pat.h>
28
29
30/*
31 * The following functions are for use by other drivers that cannot use
32 * arch_phys_wc_add and arch_phys_wc_del.
33 */
34# ifdef CONFIG_MTRR
35extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform);
36extern void mtrr_save_fixed_ranges(void *);
37extern void mtrr_save_state(void);
38extern int mtrr_add(unsigned long base, unsigned long size,
39 unsigned int type, bool increment);
40extern int mtrr_add_page(unsigned long base, unsigned long size,
41 unsigned int type, bool increment);
42extern int mtrr_del(int reg, unsigned long base, unsigned long size);
43extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
44extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
45extern void mtrr_ap_init(void);
46extern void mtrr_bp_init(void);
47extern void set_mtrr_aps_delayed_init(void);
48extern void mtrr_aps_init(void);
49extern void mtrr_bp_restore(void);
50extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
51extern int amd_special_default_mtrr(void);
52# else
53static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform)
54{
55 /*
56 * Return no-MTRRs:
57 */
58 return MTRR_TYPE_INVALID;
59}
60#define mtrr_save_fixed_ranges(arg) do {} while (0)
61#define mtrr_save_state() do {} while (0)
62static inline int mtrr_add(unsigned long base, unsigned long size,
63 unsigned int type, bool increment)
64{
65 return -ENODEV;
66}
67static inline int mtrr_add_page(unsigned long base, unsigned long size,
68 unsigned int type, bool increment)
69{
70 return -ENODEV;
71}
72static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
73{
74 return -ENODEV;
75}
76static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
77{
78 return -ENODEV;
79}
80static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
81{
82 return 0;
83}
84static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
85{
86}
87static inline void mtrr_bp_init(void)
88{
89 pat_disable("MTRRs disabled, skipping PAT initialization too.");
90}
91
92#define mtrr_ap_init() do {} while (0)
93#define set_mtrr_aps_delayed_init() do {} while (0)
94#define mtrr_aps_init() do {} while (0)
95#define mtrr_bp_restore() do {} while (0)
96# endif
97
98#ifdef CONFIG_COMPAT
99#include <linux/compat.h>
100
101struct mtrr_sentry32 {
102 compat_ulong_t base; /* Base address */
103 compat_uint_t size; /* Size of region */
104 compat_uint_t type; /* Type of region */
105};
106
107struct mtrr_gentry32 {
108 compat_ulong_t regnum; /* Register number */
109 compat_uint_t base; /* Base address */
110 compat_uint_t size; /* Size of region */
111 compat_uint_t type; /* Type of region */
112};
113
114#define MTRR_IOCTL_BASE 'M'
115
116#define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32)
117#define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32)
118#define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32)
119#define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
120#define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32)
121#define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32)
122#define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32)
123#define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32)
124#define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
125#define MTRRIOC32_KILL_PAGE_ENTRY \
126 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32)
127#endif /* CONFIG_COMPAT */
128
129/* Bit fields for enabled in struct mtrr_state_type */
130#define MTRR_STATE_MTRR_FIXED_ENABLED 0x01
131#define MTRR_STATE_MTRR_ENABLED 0x02
132
133#endif /* _ASM_X86_MTRR_H */
134