LXR linux/arch/x86/include/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 _ASM_X86_MTRR_H
  24#define _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
  32struct mtrr_sentry {
  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__
  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_gentry {
  54    unsigned long base;    /*  Base address     */
  55    unsigned int size;    /*  Size of region   */
  56    unsigned int regnum;   /*  Register number  */
  57    unsigned int type;     /*  Type of region   */
  58};
  59#endif /* !__i386__ */
  60
  61struct mtrr_var_range {
  62        __u32 base_lo;
  63        __u32 base_hi;
  64        __u32 mask_lo;
  65        __u32 mask_hi;
  66};
  67
  68/* In the Intel processor's MTRR interface, the MTRR type is always held in
  69   an 8 bit field: */
  70typedef __u8 mtrr_type;
  71
  72#define MTRR_NUM_FIXED_RANGES 88
  73#define MTRR_MAX_VAR_RANGES 256
  74
  75struct mtrr_state_type {
  76        struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
  77        mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
  78        unsigned char enabled;
  79        unsigned char have_fixed;
  80        mtrr_type def_type;
  81};
  82
  83#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
  84#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
  85
  86/*  These are the various ioctls  */
  87#define MTRRIOC_ADD_ENTRY        _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry)
  88#define MTRRIOC_SET_ENTRY        _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry)
  89#define MTRRIOC_DEL_ENTRY        _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry)
  90#define MTRRIOC_GET_ENTRY        _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
  91#define MTRRIOC_KILL_ENTRY       _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry)
  92#define MTRRIOC_ADD_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry)
  93#define MTRRIOC_SET_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry)
  94#define MTRRIOC_DEL_PAGE_ENTRY   _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry)
  95#define MTRRIOC_GET_PAGE_ENTRY   _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
  96#define MTRRIOC_KILL_PAGE_ENTRY  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry)
  97
  98/*  These are the region types  */
  99#define MTRR_TYPE_UNCACHABLE 0
 100#define MTRR_TYPE_WRCOMB     1
 101/*#define MTRR_TYPE_         2*/
 102/*#define MTRR_TYPE_         3*/
 103#define MTRR_TYPE_WRTHROUGH  4
 104#define MTRR_TYPE_WRPROT     5
 105#define MTRR_TYPE_WRBACK     6
 106#define MTRR_NUM_TYPES       7
 107
 108#ifdef __KERNEL__
 109
 110/*  The following functions are for use by other drivers  */
 111# ifdef CONFIG_MTRR
 112extern u8 mtrr_type_lookup(u64 addr, u64 end);
 113extern void mtrr_save_fixed_ranges(void *);
 114extern void mtrr_save_state(void);
 115extern int mtrr_add(unsigned long base, unsigned long size,
 116                    unsigned int type, bool increment);
 117extern int mtrr_add_page(unsigned long base, unsigned long size,
 118                         unsigned int type, bool increment);
 119extern int mtrr_del(int reg, unsigned long base, unsigned long size);
 120extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
 121extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
 122extern void mtrr_ap_init(void);
 123extern void mtrr_bp_init(void);
 124extern void set_mtrr_aps_delayed_init(void);
 125extern void mtrr_aps_init(void);
 126extern void mtrr_bp_restore(void);
 127extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 128extern int amd_special_default_mtrr(void);
 129#  else
 130static inline u8 mtrr_type_lookup(u64 addr, u64 end)
 131{
 132        /*
 133         * Return no-MTRRs:
 134         */
 135        return 0xff;
 136}
 137#define mtrr_save_fixed_ranges(arg) do {} while (0)
 138#define mtrr_save_state() do {} while (0)
 139static inline int mtrr_add(unsigned long base, unsigned long size,
 140                           unsigned int type, bool increment)
 141{
 142    return -ENODEV;
 143}
 144static inline int mtrr_add_page(unsigned long base, unsigned long size,
 145                                unsigned int type, bool increment)
 146{
 147    return -ENODEV;
 148}
 149static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
 150{
 151    return -ENODEV;
 152}
 153static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
 154{
 155    return -ENODEV;
 156}
 157static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
 158{
 159        return 0;
 160}
 161static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
 162{
 163}
 164
 165#define mtrr_ap_init() do {} while (0)
 166#define mtrr_bp_init() do {} while (0)
 167#define set_mtrr_aps_delayed_init() do {} while (0)
 168#define mtrr_aps_init() do {} while (0)
 169#define mtrr_bp_restore() do {} while (0)
 170#  endif
 171
 172#ifdef CONFIG_COMPAT
 173#include <linux/compat.h>
 174
 175struct mtrr_sentry32 {
 176    compat_ulong_t base;    /*  Base address     */
 177    compat_uint_t size;    /*  Size of region   */
 178    compat_uint_t type;     /*  Type of region   */
 179};
 180
 181struct mtrr_gentry32 {
 182    compat_ulong_t regnum;   /*  Register number  */
 183    compat_uint_t base;    /*  Base address     */
 184    compat_uint_t size;    /*  Size of region   */
 185    compat_uint_t type;     /*  Type of region   */
 186};
 187
 188#define MTRR_IOCTL_BASE 'M'
 189
 190#define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
 191#define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
 192#define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
 193#define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
 194#define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
 195#define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
 196#define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
 197#define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
 198#define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
 199#define MTRRIOC32_KILL_PAGE_ENTRY               \
 200                                 _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
 201#endif /* CONFIG_COMPAT */
 202
 203#endif /* __KERNEL__ */
 204
 205#endif /* _ASM_X86_MTRR_H */
 206