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 {
  33     unsigned long base;    /*  Base address     */
  34     unsigned int size;    /*  Size of region   */
  35     unsigned int type;     /*  Type of region   */
  36 };
  37
  38 /* Warning: this structure has a different order from i386
  39    on x86-64. The 32bit emulation code takes care of that.
  40    But you need to use this for 64bit, otherwise your X server
  41    will break. */
  42
  43 #ifdef __i386__
  44 struct mtrr_gentry
  45 {
  46     unsigned int regnum;   /*  Register number  */
  47     unsigned long base;    /*  Base address     */
  48     unsigned int size;    /*  Size of region   */
  49     unsigned int type;     /*  Type of region   */
  50 };
  51
  52 #else /* __i386__ */
  53
  54 struct mtrr_gentry
  55 {
  56     unsigned long base;    /*  Base address     */
  57     unsigned int size;    /*  Size of region   */
  58     unsigned int regnum;   /*  Register number  */
  59     unsigned int type;     /*  Type of region   */
  60 };
  61 #endif /* !__i386__ */
  62
  63 /*  These are the various ioctls  */
  64 #define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
  65 #define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
  66 #define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
  67 #define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
  68 #define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
  69 #define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
  70 #define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
  71 #define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
  72 #define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
  73 #define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)
  74
  75 /*  These are the region types  */
  76 #define MTRR_TYPE_UNCACHABLE 0
  77 #define MTRR_TYPE_WRCOMB     1
  78 /*#define MTRR_TYPE_         2*/
  79 /*#define MTRR_TYPE_         3*/
  80 #define MTRR_TYPE_WRTHROUGH  4
  81 #define MTRR_TYPE_WRPROT     5
  82 #define MTRR_TYPE_WRBACK     6
  83 #define MTRR_NUM_TYPES       7
  84
  85 #ifdef __KERNEL__
  86
  87 /*  The following functions are for use by other drivers  */
  88 # ifdef CONFIG_MTRR
  89 extern void mtrr_save_fixed_ranges(void *);
  90 extern void mtrr_save_state(void);
  91 extern int mtrr_add (unsigned long base, unsigned long size,
  92                      unsigned int type, bool increment);
  93 extern int mtrr_add_page (unsigned long base, unsigned long size,
  94                      unsigned int type, bool increment);
  95 extern int mtrr_del (int reg, unsigned long base, unsigned long size);
  96 extern int mtrr_del_page (int reg, unsigned long base, unsigned long size);
  97 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
  98 extern void mtrr_ap_init(void);
  99 extern void mtrr_bp_init(void);
 100 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 101 #  else
 102 #define mtrr_save_fixed_ranges(arg) do {} while (0)
 103 #define mtrr_save_state() do {} while (0)
 104 static __inline__ int mtrr_add (unsigned long base, unsigned long size,
 105                                 unsigned int type, bool increment)
 106 {
 107     return -ENODEV;
 108 }
 109 static __inline__ int mtrr_add_page (unsigned long base, unsigned long size,
 110                                 unsigned int type, bool increment)
 111 {
 112     return -ENODEV;
 113 }
 114 static __inline__ int mtrr_del (int reg, unsigned long base,
 115                                 unsigned long size)
 116 {
 117     return -ENODEV;
 118 }
 119 static __inline__ int mtrr_del_page (int reg, unsigned long base,
 120                                 unsigned long size)
 121 {
 122     return -ENODEV;
 123 }
 124 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
 125 {
 126         return 0;
 127 }
 128 static __inline__ void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) {;}
 129
 130 #define mtrr_ap_init() do {} while (0)
 131 #define mtrr_bp_init() do {} while (0)
 132 #  endif
 133
 134 #ifdef CONFIG_COMPAT
 135 #include <linux/compat.h>
 136
 137 struct mtrr_sentry32
 138 {
 139     compat_ulong_t base;    /*  Base address     */
 140     compat_uint_t size;    /*  Size of region   */
 141     compat_uint_t type;     /*  Type of region   */
 142 };
 143
 144 struct mtrr_gentry32
 145 {
 146     compat_ulong_t regnum;   /*  Register number  */
 147     compat_uint_t base;    /*  Base address     */
 148     compat_uint_t size;    /*  Size of region   */
 149     compat_uint_t type;     /*  Type of region   */
 150 };
 151
 152 #define MTRR_IOCTL_BASE 'M'
 153
 154 #define MTRRIOC32_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
 155 #define MTRRIOC32_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
 156 #define MTRRIOC32_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
 157 #define MTRRIOC32_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
 158 #define MTRRIOC32_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
 159 #define MTRRIOC32_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
 160 #define MTRRIOC32_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
 161 #define MTRRIOC32_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
 162 #define MTRRIOC32_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
 163 #define MTRRIOC32_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
 164 #endif /* CONFIG_COMPAT */
 165
 166 #endif /* __KERNEL__ */
 167
 168 #endif  /*  _ASM_X86_MTRR_H  */