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
  32 struct 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__
  44 struct 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
  53 struct 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
  61 struct 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: */
  70 typedef __u8 mtrr_type;
  71
  72 #define MTRR_NUM_FIXED_RANGES 88
  73 #define MTRR_MAX_VAR_RANGES 256
  74
  75 struct 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
 112 extern u8 mtrr_type_lookup(u64 addr, u64 end);
 113 extern void mtrr_save_fixed_ranges(void *);
 114 extern void mtrr_save_state(void);
 115 extern int mtrr_add(unsigned long base, unsigned long size,
 116                     unsigned int type, bool increment);
 117 extern int mtrr_add_page(unsigned long base, unsigned long size,
 118                          unsigned int type, bool increment);
 119 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
 120 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
 121 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
 122 extern void mtrr_ap_init(void);
 123 extern void mtrr_bp_init(void);
 124 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 125 extern int amd_special_default_mtrr(void);
 126 #  else
 127 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
 128 {
 129         /*
 130          * Return no-MTRRs:
 131          */
 132         return 0xff;
 133 }
 134 #define mtrr_save_fixed_ranges(arg) do {} while (0)
 135 #define mtrr_save_state() do {} while (0)
 136 static inline int mtrr_add(unsigned long base, unsigned long size,
 137                            unsigned int type, bool increment)
 138 {
 139     return -ENODEV;
 140 }
 141 static inline int mtrr_add_page(unsigned long base, unsigned long size,
 142                                 unsigned int type, bool increment)
 143 {
 144     return -ENODEV;
 145 }
 146 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
 147 {
 148     return -ENODEV;
 149 }
 150 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
 151 {
 152     return -ENODEV;
 153 }
 154 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
 155 {
 156         return 0;
 157 }
 158 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
 159 {
 160 }
 161
 162 #define mtrr_ap_init() do {} while (0)
 163 #define mtrr_bp_init() do {} while (0)
 164 #  endif
 165
 166 #ifdef CONFIG_COMPAT
 167 #include <linux/compat.h>
 168
 169 struct mtrr_sentry32 {
 170     compat_ulong_t base;    /*  Base address     */
 171     compat_uint_t size;    /*  Size of region   */
 172     compat_uint_t type;     /*  Type of region   */
 173 };
 174
 175 struct mtrr_gentry32 {
 176     compat_ulong_t regnum;   /*  Register number  */
 177     compat_uint_t base;    /*  Base address     */
 178     compat_uint_t size;    /*  Size of region   */
 179     compat_uint_t type;     /*  Type of region   */
 180 };
 181
 182 #define MTRR_IOCTL_BASE 'M'
 183
 184 #define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
 185 #define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
 186 #define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
 187 #define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
 188 #define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
 189 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
 190 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
 191 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
 192 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
 193 #define MTRRIOC32_KILL_PAGE_ENTRY               \
 194                                  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
 195 #endif /* CONFIG_COMPAT */
 196
 197 #endif /* __KERNEL__ */
 198
 199 #endif /* _ASM_X86_MTRR_H */