xref: /openbmc/linux/arch/x86/include/asm/mtrr.h (revision d87c25e8)
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 void mtrr_bp_init(void);
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
35 extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform);
36 extern void mtrr_save_fixed_ranges(void *);
37 extern void mtrr_save_state(void);
38 extern int mtrr_add(unsigned long base, unsigned long size,
39 		    unsigned int type, bool increment);
40 extern int mtrr_add_page(unsigned long base, unsigned long size,
41 			 unsigned int type, bool increment);
42 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
43 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
44 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
45 extern void mtrr_ap_init(void);
46 extern void set_mtrr_aps_delayed_init(void);
47 extern void mtrr_aps_init(void);
48 extern void mtrr_bp_restore(void);
49 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
50 extern int amd_special_default_mtrr(void);
51 #  else
52 static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform)
53 {
54 	/*
55 	 * Return no-MTRRs:
56 	 */
57 	return MTRR_TYPE_INVALID;
58 }
59 #define mtrr_save_fixed_ranges(arg) do {} while (0)
60 #define mtrr_save_state() do {} while (0)
61 static inline int mtrr_add(unsigned long base, unsigned long size,
62 			   unsigned int type, bool increment)
63 {
64     return -ENODEV;
65 }
66 static inline int mtrr_add_page(unsigned long base, unsigned long size,
67 				unsigned int type, bool increment)
68 {
69     return -ENODEV;
70 }
71 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
72 {
73     return -ENODEV;
74 }
75 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
76 {
77     return -ENODEV;
78 }
79 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
80 {
81 	return 0;
82 }
83 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
84 {
85 }
86 #define mtrr_ap_init() do {} while (0)
87 #define set_mtrr_aps_delayed_init() do {} while (0)
88 #define mtrr_aps_init() do {} while (0)
89 #define mtrr_bp_restore() do {} while (0)
90 #  endif
91 
92 #ifdef CONFIG_COMPAT
93 #include <linux/compat.h>
94 
95 struct mtrr_sentry32 {
96     compat_ulong_t base;    /*  Base address     */
97     compat_uint_t size;    /*  Size of region   */
98     compat_uint_t type;     /*  Type of region   */
99 };
100 
101 struct mtrr_gentry32 {
102     compat_ulong_t regnum;   /*  Register number  */
103     compat_uint_t base;    /*  Base address     */
104     compat_uint_t size;    /*  Size of region   */
105     compat_uint_t type;     /*  Type of region   */
106 };
107 
108 #define MTRR_IOCTL_BASE 'M'
109 
110 #define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
111 #define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
112 #define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
113 #define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
114 #define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
115 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
116 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
117 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
118 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
119 #define MTRRIOC32_KILL_PAGE_ENTRY		\
120 				 _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
121 #endif /* CONFIG_COMPAT */
122 
123 /* Bit fields for enabled in struct mtrr_state_type */
124 #define MTRR_STATE_MTRR_FIXED_ENABLED	0x01
125 #define MTRR_STATE_MTRR_ENABLED		0x02
126 
127 #endif /* _ASM_X86_MTRR_H */
128