include/asm-x86/mtrr.h

   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 <linux/ioctl.h>
  27 #include <linux/errno.h>
  28
  29 #define MTRR_IOCTL_BASE 'M'
  30
  31 struct mtrr_sentry {
  32     unsigned long base;    /*  Base address     */
  33     unsigned int size;    /*  Size of region   */
  34     unsigned int type;     /*  Type of region   */
  35 };
  36
  37 /* Warning: this structure has a different order from i386
  38    on x86-64. The 32bit emulation code takes care of that.
  39    But you need to use this for 64bit, otherwise your X server
  40    will break. */
  41
  42 #ifdef __i386__
  43 struct mtrr_gentry {
  44     unsigned int regnum;   /*  Register number  */
  45     unsigned long base;    /*  Base address     */
  46     unsigned int size;    /*  Size of region   */
  47     unsigned int type;     /*  Type of region   */
  48 };
  49
  50 #else /* __i386__ */
  51
  52 struct mtrr_gentry {
  53     unsigned long base;    /*  Base address     */
  54     unsigned int size;    /*  Size of region   */
  55     unsigned int regnum;   /*  Register number  */
  56     unsigned int type;     /*  Type of region   */
  57 };
  58 #endif /* !__i386__ */
  59
  60 /*  These are the various ioctls  */
  61 #define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
  62 #define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
  63 #define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
  64 #define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
  65 #define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
  66 #define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
  67 #define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
  68 #define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
  69 #define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
  70 #define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)
  71
  72 /*  These are the region types  */
  73 #define MTRR_TYPE_UNCACHABLE 0
  74 #define MTRR_TYPE_WRCOMB     1
  75 /*#define MTRR_TYPE_         2*/
  76 /*#define MTRR_TYPE_         3*/
  77 #define MTRR_TYPE_WRTHROUGH  4
  78 #define MTRR_TYPE_WRPROT     5
  79 #define MTRR_TYPE_WRBACK     6
  80 #define MTRR_NUM_TYPES       7
  81
  82 #ifdef __KERNEL__
  83
  84 /*  The following functions are for use by other drivers  */
  85 # ifdef CONFIG_MTRR
  86 extern u8 mtrr_type_lookup(u64 addr, u64 end);
  87 extern void mtrr_save_fixed_ranges(void *);
  88 extern void mtrr_save_state(void);
  89 extern int mtrr_add(unsigned long base, unsigned long size,
  90                     unsigned int type, bool increment);
  91 extern int mtrr_add_page(unsigned long base, unsigned long size,
  92                          unsigned int type, bool increment);
  93 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
  94 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
  95 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
  96 extern void mtrr_ap_init(void);
  97 extern void mtrr_bp_init(void);
  98 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
  99 extern int amd_special_default_mtrr(void);
 100 #  else
 101 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
 102 {
 103         /*
 104          * Return no-MTRRs:
 105          */
 106         return 0xff;
 107 }
 108 #define mtrr_save_fixed_ranges(arg) do {} while (0)
 109 #define mtrr_save_state() do {} while (0)
 110 static inline int mtrr_add(unsigned long base, unsigned long size,
 111                            unsigned int type, bool increment)
 112 {
 113     return -ENODEV;
 114 }
 115 static inline int mtrr_add_page(unsigned long base, unsigned long size,
 116                                 unsigned int type, bool increment)
 117 {
 118     return -ENODEV;
 119 }
 120 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
 121 {
 122     return -ENODEV;
 123 }
 124 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
 125 {
 126     return -ENODEV;
 127 }
 128 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
 129 {
 130         return 0;
 131 }
 132 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
 133 {
 134 }
 135
 136 #define mtrr_ap_init() do {} while (0)
 137 #define mtrr_bp_init() do {} while (0)
 138 #  endif
 139
 140 #ifdef CONFIG_COMPAT
 141 #include <linux/compat.h>
 142
 143 struct mtrr_sentry32 {
 144     compat_ulong_t base;    /*  Base address     */
 145     compat_uint_t size;    /*  Size of region   */
 146     compat_uint_t type;     /*  Type of region   */
 147 };
 148
 149 struct mtrr_gentry32 {
 150     compat_ulong_t regnum;   /*  Register number  */
 151     compat_uint_t base;    /*  Base address     */
 152     compat_uint_t size;    /*  Size of region   */
 153     compat_uint_t type;     /*  Type of region   */
 154 };
 155
 156 #define MTRR_IOCTL_BASE 'M'
 157
 158 #define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
 159 #define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
 160 #define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
 161 #define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
 162 #define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
 163 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
 164 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
 165 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
 166 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
 167 #define MTRRIOC32_KILL_PAGE_ENTRY               \
 168                                  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
 169 #endif /* CONFIG_COMPAT */
 170
 171 #endif /* __KERNEL__ */
 172
 173 #endif  /*  _ASM_X86_MTRR_H  */