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 <uapi/asm/mtrr.h>
  27#include <asm/pat.h>
  28
  29
  30/*
  31 * The following functions are for use by other drivers that cannot use
  32 * arch_phys_wc_add and arch_phys_wc_del.
  33 */
  34# ifdef CONFIG_MTRR
  35extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform);
  36extern void mtrr_save_fixed_ranges(void *);
  37extern void mtrr_save_state(void);
  38extern int mtrr_add(unsigned long base, unsigned long size,
  39                    unsigned int type, bool increment);
  40extern int mtrr_add_page(unsigned long base, unsigned long size,
  41                         unsigned int type, bool increment);
  42extern int mtrr_del(int reg, unsigned long base, unsigned long size);
  43extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
  44extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
  45extern void mtrr_ap_init(void);
  46extern void mtrr_bp_init(void);
  47extern void set_mtrr_aps_delayed_init(void);
  48extern void mtrr_aps_init(void);
  49extern void mtrr_bp_restore(void);
  50extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
  51extern int amd_special_default_mtrr(void);
  52#  else
  53static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform)
  54{
  55        /*
  56         * Return no-MTRRs:
  57         */
  58        return MTRR_TYPE_INVALID;
  59}
  60#define mtrr_save_fixed_ranges(arg) do {} while (0)
  61#define mtrr_save_state() do {} while (0)
  62static inline int mtrr_add(unsigned long base, unsigned long size,
  63                           unsigned int type, bool increment)
  64{
  65    return -ENODEV;
  66}
  67static inline int mtrr_add_page(unsigned long base, unsigned long size,
  68                                unsigned int type, bool increment)
  69{
  70    return -ENODEV;
  71}
  72static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
  73{
  74    return -ENODEV;
  75}
  76static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
  77{
  78    return -ENODEV;
  79}
  80static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
  81{
  82        return 0;
  83}
  84static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
  85{
  86}
  87static inline void mtrr_bp_init(void)
  88{
  89        pat_disable("MTRRs disabled, skipping PAT initialization too.");
  90}
  91
  92#define mtrr_ap_init() do {} while (0)
  93#define set_mtrr_aps_delayed_init() do {} while (0)
  94#define mtrr_aps_init() do {} while (0)
  95#define mtrr_bp_restore() do {} while (0)
  96#  endif
  97
  98#ifdef CONFIG_COMPAT
  99#include <linux/compat.h>
 100
 101struct mtrr_sentry32 {
 102    compat_ulong_t base;    /*  Base address     */
 103    compat_uint_t size;    /*  Size of region   */
 104    compat_uint_t type;     /*  Type of region   */
 105};
 106
 107struct mtrr_gentry32 {
 108    compat_ulong_t regnum;   /*  Register number  */
 109    compat_uint_t base;    /*  Base address     */
 110    compat_uint_t size;    /*  Size of region   */
 111    compat_uint_t type;     /*  Type of region   */
 112};
 113
 114#define MTRR_IOCTL_BASE 'M'
 115
 116#define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
 117#define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
 118#define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
 119#define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
 120#define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
 121#define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
 122#define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
 123#define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
 124#define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
 125#define MTRRIOC32_KILL_PAGE_ENTRY               \
 126                                 _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
 127#endif /* CONFIG_COMPAT */
 128
 129/* Bit fields for enabled in struct mtrr_state_type */
 130#define MTRR_STATE_MTRR_FIXED_ENABLED   0x01
 131#define MTRR_STATE_MTRR_ENABLED         0x02
 132
 133#endif /* _ASM_X86_MTRR_H */
 134