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
28
29/*
30 * The following functions are for use by other drivers that cannot use
31 * arch_phys_wc_add and arch_phys_wc_del.
32 */
33# ifdef CONFIG_MTRR
34extern u8 mtrr_type_lookup(u64 addr, u64 end);
35extern void mtrr_save_fixed_ranges(void *);
36extern void mtrr_save_state(void);
37extern int mtrr_add(unsigned long base, unsigned long size,
38		    unsigned int type, bool increment);
39extern int mtrr_add_page(unsigned long base, unsigned long size,
40			 unsigned int type, bool increment);
41extern int mtrr_del(int reg, unsigned long base, unsigned long size);
42extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
43extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
44extern void mtrr_ap_init(void);
45extern void mtrr_bp_init(void);
46extern void set_mtrr_aps_delayed_init(void);
47extern void mtrr_aps_init(void);
48extern void mtrr_bp_restore(void);
49extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
50extern int amd_special_default_mtrr(void);
51extern int phys_wc_to_mtrr_index(int handle);
52#  else
53static inline u8 mtrr_type_lookup(u64 addr, u64 end)
54{
55	/*
56	 * Return no-MTRRs:
57	 */
58	return 0xff;
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 int phys_wc_to_mtrr_index(int handle)
88{
89	return -1;
90}
91
92#define mtrr_ap_init() do {} while (0)
93#define mtrr_bp_init() do {} while (0)
94#define set_mtrr_aps_delayed_init() do {} while (0)
95#define mtrr_aps_init() do {} while (0)
96#define mtrr_bp_restore() do {} while (0)
97#  endif
98
99#ifdef CONFIG_COMPAT
100#include <linux/compat.h>
101
102struct mtrr_sentry32 {
103    compat_ulong_t base;    /*  Base address     */
104    compat_uint_t size;    /*  Size of region   */
105    compat_uint_t type;     /*  Type of region   */
106};
107
108struct mtrr_gentry32 {
109    compat_ulong_t regnum;   /*  Register number  */
110    compat_uint_t base;    /*  Base address     */
111    compat_uint_t size;    /*  Size of region   */
112    compat_uint_t type;     /*  Type of region   */
113};
114
115#define MTRR_IOCTL_BASE 'M'
116
117#define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
118#define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
119#define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
120#define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
121#define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
122#define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
123#define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
124#define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
125#define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
126#define MTRRIOC32_KILL_PAGE_ENTRY		\
127				 _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
128#endif /* CONFIG_COMPAT */
129
130#endif /* _ASM_X86_MTRR_H */
131