LXR linux/arch/x86/include/uapi/asm/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 _UAPI_ASM_X86_MTRR_H
  24#define _UAPI_ASM_X86_MTRR_H
  25
  26#include <linux/types.h>
  27#include <linux/ioctl.h>
  28#include <linux/errno.h>
  29
  30#define MTRR_IOCTL_BASE 'M'
  31
  32/* Warning: this structure has a different order from i386
  33   on x86-64. The 32bit emulation code takes care of that.
  34   But you need to use this for 64bit, otherwise your X server
  35   will break. */
  36
  37#ifdef __i386__
  38struct mtrr_sentry {
  39    unsigned long base;    /*  Base address     */
  40    unsigned int size;    /*  Size of region   */
  41    unsigned int type;     /*  Type of region   */
  42};
  43
  44struct mtrr_gentry {
  45    unsigned int regnum;   /*  Register number  */
  46    unsigned long base;    /*  Base address     */
  47    unsigned int size;    /*  Size of region   */
  48    unsigned int type;     /*  Type of region   */
  49};
  50
  51#else /* __i386__ */
  52
  53struct mtrr_sentry {
  54        __u64 base;             /*  Base address     */
  55        __u32 size;             /*  Size of region   */
  56        __u32 type;             /*  Type of region   */
  57};
  58
  59struct mtrr_gentry {
  60        __u64 base;             /*  Base address     */
  61        __u32 size;             /*  Size of region   */
  62        __u32 regnum;           /*  Register number  */
  63        __u32 type;             /*  Type of region   */
  64        __u32 _pad;             /*  Unused           */
  65};
  66
  67#endif /* !__i386__ */
  68
  69struct mtrr_var_range {
  70        __u32 base_lo;
  71        __u32 base_hi;
  72        __u32 mask_lo;
  73        __u32 mask_hi;
  74};
  75
  76/* In the Intel processor's MTRR interface, the MTRR type is always held in
  77   an 8 bit field: */
  78typedef __u8 mtrr_type;
  79
  80#define MTRR_NUM_FIXED_RANGES 88
  81#define MTRR_MAX_VAR_RANGES 256
  82
  83struct mtrr_state_type {
  84        struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
  85        mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
  86        unsigned char enabled;
  87        unsigned char have_fixed;
  88        mtrr_type def_type;
  89};
  90
  91#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
  92#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
  93
  94/*  These are the various ioctls  */
  95#define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
  96#define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
  97#define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
  98#define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
  99#define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
 100#define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
 101#define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
 102#define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
 103#define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
 104#define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)
 105
 106/* MTRR memory types, which are defined in SDM */
 107#define MTRR_TYPE_UNCACHABLE 0
 108#define MTRR_TYPE_WRCOMB     1
 109/*#define MTRR_TYPE_         2*/
 110/*#define MTRR_TYPE_         3*/
 111#define MTRR_TYPE_WRTHROUGH  4
 112#define MTRR_TYPE_WRPROT     5
 113#define MTRR_TYPE_WRBACK     6
 114#define MTRR_NUM_TYPES       7
 115
 116/*
 117 * Invalid MTRR memory type.  mtrr_type_lookup() returns this value when
 118 * MTRRs are disabled.  Note, this value is allocated from the reserved
 119 * values (0x7-0xff) of the MTRR memory types.
 120 */
 121#define MTRR_TYPE_INVALID    0xff
 122
 123#endif /* _UAPI_ASM_X86_MTRR_H */
 124