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/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 struct mtrr_gentry
  39 {
  40     unsigned int regnum;   /*  Register number  */
  41     unsigned long base;    /*  Base address     */
  42     unsigned int 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 #define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
  53 #define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
  54 #define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
  55 #define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
  56 #define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)
  57
  58 /*  These are the region types  */
  59 #define MTRR_TYPE_UNCACHABLE 0
  60 #define MTRR_TYPE_WRCOMB     1
  61 /*#define MTRR_TYPE_         2*/
  62 /*#define MTRR_TYPE_         3*/
  63 #define MTRR_TYPE_WRTHROUGH  4
  64 #define MTRR_TYPE_WRPROT     5
  65 #define MTRR_TYPE_WRBACK     6
  66 #define MTRR_NUM_TYPES       7
  67
  68 #ifdef __KERNEL__
  69
  70 /*  The following functions are for use by other drivers  */
  71 # ifdef CONFIG_MTRR
  72 extern void mtrr_save_fixed_ranges(void *);
  73 extern void mtrr_save_state(void);
  74 extern int mtrr_add (unsigned long base, unsigned long size,
  75                      unsigned int type, char increment);
  76 extern int mtrr_add_page (unsigned long base, unsigned long size,
  77                      unsigned int type, char increment);
  78 extern int mtrr_del (int reg, unsigned long base, unsigned long size);
  79 extern int mtrr_del_page (int reg, unsigned long base, unsigned long size);
  80 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
  81 extern void mtrr_ap_init(void);
  82 extern void mtrr_bp_init(void);
  83 #  else
  84 #define mtrr_save_fixed_ranges(arg) do {} while (0)
  85 #define mtrr_save_state() do {} while (0)
  86 static __inline__ int mtrr_add (unsigned long base, unsigned long size,
  87                                 unsigned int type, char increment)
  88 {
  89     return -ENODEV;
  90 }
  91 static __inline__ int mtrr_add_page (unsigned long base, unsigned long size,
  92                                 unsigned int type, char increment)
  93 {
  94     return -ENODEV;
  95 }
  96 static __inline__ int mtrr_del (int reg, unsigned long base,
  97                                 unsigned long size)
  98 {
  99     return -ENODEV;
 100 }
 101 static __inline__ int mtrr_del_page (int reg, unsigned long base,
 102                                 unsigned long size)
 103 {
 104     return -ENODEV;
 105 }
 106
 107 static __inline__ void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) {;}
 108
 109 #define mtrr_ap_init() do {} while (0)
 110 #define mtrr_bp_init() do {} while (0)
 111 #  endif
 112
 113 #endif
 114
 115 #endif  /*  _LINUX_MTRR_H  */