include/asm-i386/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 _LINUX_MTRR_H
  24 #define _LINUX_MTRR_H
  25
  26 #include <linux/config.h>
  27 #include <linux/ioctl.h>
  28
  29 #define MTRR_IOCTL_BASE 'M'
  30
  31 struct mtrr_sentry
  32 {
  33     unsigned long base;    /*  Base address     */
  34     unsigned long size;    /*  Size of region   */
  35     unsigned int type;     /*  Type of region   */
  36 };
  37
  38 struct mtrr_gentry
  39 {
  40     unsigned int regnum;   /*  Register number  */
  41     unsigned long base;    /*  Base address     */
  42     unsigned long size;    /*  Size of region   */
  43     unsigned int type;     /*  Type of region   */
  44 };
  45
  46 /*  These are the various ioctls  */
  47 #define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
  48 #define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
  49 #define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
  50 #define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
  51 #define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
  52
  53 /*  These are the region types  */
  54 #define MTRR_TYPE_UNCACHABLE 0
  55 #define MTRR_TYPE_WRCOMB     1
  56 /*#define MTRR_TYPE_         2*/
  57 /*#define MTRR_TYPE_         3*/
  58 #define MTRR_TYPE_WRTHROUGH  4
  59 #define MTRR_TYPE_WRPROT     5
  60 #define MTRR_TYPE_WRBACK     6
  61 #define MTRR_NUM_TYPES       7
  62
  63 #ifdef MTRR_NEED_STRINGS
  64 static char *mtrr_strings[MTRR_NUM_TYPES] =
  65 {
  66     "uncachable",               /* 0 */
  67     "write-combining",          /* 1 */
  68     "?",                        /* 2 */
  69     "?",                        /* 3 */
  70     "write-through",            /* 4 */
  71     "write-protect",            /* 5 */
  72     "write-back",               /* 6 */
  73 };
  74 #endif
  75
  76 #ifdef __KERNEL__
  77
  78 /*  The following functions are for use by other drivers  */
  79 # ifdef CONFIG_MTRR
  80 extern int mtrr_add (unsigned long base, unsigned long size,
  81                      unsigned int type, char increment);
  82 extern int mtrr_del (int reg, unsigned long base, unsigned long size);
  83 #  else
  84 static __inline__ int mtrr_add (unsigned long base, unsigned long size,
  85                                 unsigned int type, char increment)
  86 {
  87     return -ENODEV;
  88 }
  89 static __inline__ int mtrr_del (int reg, unsigned long base,
  90                                 unsigned long size)
  91 {
  92     return -ENODEV;
  93 }
  94 #  endif
  95
  96 /*  The following functions are for initialisation: don't use them!  */
  97 extern int mtrr_init (void);
  98 #  if defined(CONFIG_SMP) && defined(CONFIG_MTRR)
  99 extern void mtrr_init_boot_cpu (void);
 100 extern void mtrr_init_secondary_cpu (void);
 101 #  endif
 102
 103 #endif
 104
 105 #endif  /*  _LINUX_MTRR_H  */