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Linux/arch/x86/include/asm/mtrr.h

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  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
 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("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 
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 

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