xref: /openbmc/linux/arch/x86/include/asm/mtrr.h (revision 35267cea)
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/memtype.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
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 mtrr_bp_init(void);
47 extern void set_mtrr_aps_delayed_init(void);
48 extern void mtrr_aps_init(void);
49 extern void mtrr_bp_restore(void);
50 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
51 extern int amd_special_default_mtrr(void);
52 #  else
53 static 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)
62 static inline int mtrr_add(unsigned long base, unsigned long size,
63 			   unsigned int type, bool increment)
64 {
65     return -ENODEV;
66 }
67 static inline int mtrr_add_page(unsigned long base, unsigned long size,
68 				unsigned int type, bool increment)
69 {
70     return -ENODEV;
71 }
72 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
73 {
74     return -ENODEV;
75 }
76 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
77 {
78     return -ENODEV;
79 }
80 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
81 {
82 	return 0;
83 }
84 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
85 {
86 }
87 static inline void mtrr_bp_init(void)
88 {
89 	pat_disable("PAT support disabled because CONFIG_MTRR is disabled in the kernel.");
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 
101 struct 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 
107 struct 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