LXR linux/arch/x86/include/uapi/asm/mtrr.h

   1/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
   2/*  Generic MTRR (Memory Type Range Register) ioctls.
   3
   4    Copyright (C) 1997-1999  Richard Gooch
   5
   6    This library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public
   8    License as published by the Free Software Foundation; either
   9    version 2 of the License, or (at your option) any later version.
  10
  11    This library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with this library; if not, write to the Free
  18    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20    Richard Gooch may be reached by email at  rgooch@atnf.csiro.au
  21    The postal address is:
  22      Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
  23*/
  24#ifndef _UAPI_ASM_X86_MTRR_H
  25#define _UAPI_ASM_X86_MTRR_H
  26
  27#include <linux/types.h>
  28#include <linux/ioctl.h>
  29#include <linux/errno.h>
  30
  31#define MTRR_IOCTL_BASE 'M'
  32
  33/* Warning: this structure has a different order from i386
  34   on x86-64. The 32bit emulation code takes care of that.
  35   But you need to use this for 64bit, otherwise your X server
  36   will break. */
  37
  38#ifdef __i386__
  39struct mtrr_sentry {
  40    unsigned long base;    /*  Base address     */
  41    unsigned int size;    /*  Size of region   */
  42    unsigned int type;     /*  Type of region   */
  43};
  44
  45struct mtrr_gentry {
  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
  54struct mtrr_sentry {
  55        __u64 base;             /*  Base address     */
  56        __u32 size;             /*  Size of region   */
  57        __u32 type;             /*  Type of region   */
  58};
  59
  60struct mtrr_gentry {
  61        __u64 base;             /*  Base address     */
  62        __u32 size;             /*  Size of region   */
  63        __u32 regnum;           /*  Register number  */
  64        __u32 type;             /*  Type of region   */
  65        __u32 _pad;             /*  Unused           */
  66};
  67
  68#endif /* !__i386__ */
  69
  70struct mtrr_var_range {
  71        __u32 base_lo;
  72        __u32 base_hi;
  73        __u32 mask_lo;
  74        __u32 mask_hi;
  75};
  76
  77/* In the Intel processor's MTRR interface, the MTRR type is always held in
  78   an 8 bit field: */
  79typedef __u8 mtrr_type;
  80
  81#define MTRR_NUM_FIXED_RANGES 88
  82#define MTRR_MAX_VAR_RANGES 256
  83
  84struct mtrr_state_type {
  85        struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
  86        mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
  87        unsigned char enabled;
  88        unsigned char have_fixed;
  89        mtrr_type def_type;
  90};
  91
  92#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
  93#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
  94
  95/*  These are the various ioctls  */
  96#define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
  97#define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
  98#define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
  99#define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
 100#define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
 101#define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
 102#define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
 103#define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
 104#define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
 105#define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)
 106
 107/* MTRR memory types, which are defined in SDM */
 108#define MTRR_TYPE_UNCACHABLE 0
 109#define MTRR_TYPE_WRCOMB     1
 110/*#define MTRR_TYPE_         2*/
 111/*#define MTRR_TYPE_         3*/
 112#define MTRR_TYPE_WRTHROUGH  4
 113#define MTRR_TYPE_WRPROT     5
 114#define MTRR_TYPE_WRBACK     6
 115#define MTRR_NUM_TYPES       7
 116
 117/*
 118 * Invalid MTRR memory type.  mtrr_type_lookup() returns this value when
 119 * MTRRs are disabled.  Note, this value is allocated from the reserved
 120 * values (0x7-0xff) of the MTRR memory types.
 121 */
 122#define MTRR_TYPE_INVALID    0xff
 123
 124#endif /* _UAPI_ASM_X86_MTRR_H */
 125