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 /* 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__
  38 struct mtrr_sentry {
  39     unsigned long base;    /*  Base address     */
  40     unsigned int size;    /*  Size of region   */
  41     unsigned int type;     /*  Type of region   */
  42 };
  43
  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_sentry {
  54         __u64 base;             /*  Base address     */
  55         __u32 size;             /*  Size of region   */
  56         __u32 type;             /*  Type of region   */
  57 };
  58
  59 struct 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
  69 struct 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: */
  78 typedef __u8 mtrr_type;
  79
  80 #define MTRR_NUM_FIXED_RANGES 88
  81 #define MTRR_MAX_VAR_RANGES 256
  82
  83 struct 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 /*  These are the region types  */
 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 #ifdef __KERNEL__
 117
 118 /*  The following functions are for use by other drivers  */
 119 # ifdef CONFIG_MTRR
 120 extern u8 mtrr_type_lookup(u64 addr, u64 end);
 121 extern void mtrr_save_fixed_ranges(void *);
 122 extern void mtrr_save_state(void);
 123 extern int mtrr_add(unsigned long base, unsigned long size,
 124                     unsigned int type, bool increment);
 125 extern int mtrr_add_page(unsigned long base, unsigned long size,
 126                          unsigned int type, bool increment);
 127 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
 128 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
 129 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
 130 extern void mtrr_ap_init(void);
 131 extern void mtrr_bp_init(void);
 132 extern void set_mtrr_aps_delayed_init(void);
 133 extern void mtrr_aps_init(void);
 134 extern void mtrr_bp_restore(void);
 135 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 136 extern int amd_special_default_mtrr(void);
 137 #  else
 138 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
 139 {
 140         /*
 141          * Return no-MTRRs:
 142          */
 143         return 0xff;
 144 }
 145 #define mtrr_save_fixed_ranges(arg) do {} while (0)
 146 #define mtrr_save_state() do {} while (0)
 147 static inline int mtrr_add(unsigned long base, unsigned long size,
 148                            unsigned int type, bool increment)
 149 {
 150     return -ENODEV;
 151 }
 152 static inline int mtrr_add_page(unsigned long base, unsigned long size,
 153                                 unsigned int type, bool increment)
 154 {
 155     return -ENODEV;
 156 }
 157 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
 158 {
 159     return -ENODEV;
 160 }
 161 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
 162 {
 163     return -ENODEV;
 164 }
 165 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
 166 {
 167         return 0;
 168 }
 169 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
 170 {
 171 }
 172
 173 #define mtrr_ap_init() do {} while (0)
 174 #define mtrr_bp_init() do {} while (0)
 175 #define set_mtrr_aps_delayed_init() do {} while (0)
 176 #define mtrr_aps_init() do {} while (0)
 177 #define mtrr_bp_restore() do {} while (0)
 178 #  endif
 179
 180 #ifdef CONFIG_COMPAT
 181 #include <linux/compat.h>
 182
 183 struct mtrr_sentry32 {
 184     compat_ulong_t base;    /*  Base address     */
 185     compat_uint_t size;    /*  Size of region   */
 186     compat_uint_t type;     /*  Type of region   */
 187 };
 188
 189 struct mtrr_gentry32 {
 190     compat_ulong_t regnum;   /*  Register number  */
 191     compat_uint_t base;    /*  Base address     */
 192     compat_uint_t size;    /*  Size of region   */
 193     compat_uint_t type;     /*  Type of region   */
 194 };
 195
 196 #define MTRR_IOCTL_BASE 'M'
 197
 198 #define MTRRIOC32_ADD_ENTRY      _IOW(MTRR_IOCTL_BASE,  0, struct mtrr_sentry32)
 199 #define MTRRIOC32_SET_ENTRY      _IOW(MTRR_IOCTL_BASE,  1, struct mtrr_sentry32)
 200 #define MTRRIOC32_DEL_ENTRY      _IOW(MTRR_IOCTL_BASE,  2, struct mtrr_sentry32)
 201 #define MTRRIOC32_GET_ENTRY      _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
 202 #define MTRRIOC32_KILL_ENTRY     _IOW(MTRR_IOCTL_BASE,  4, struct mtrr_sentry32)
 203 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  5, struct mtrr_sentry32)
 204 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  6, struct mtrr_sentry32)
 205 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE,  7, struct mtrr_sentry32)
 206 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
 207 #define MTRRIOC32_KILL_PAGE_ENTRY               \
 208                                  _IOW(MTRR_IOCTL_BASE,  9, struct mtrr_sentry32)
 209 #endif /* CONFIG_COMPAT */
 210
 211 #endif /* __KERNEL__ */
 212
 213 #endif /* _ASM_X86_MTRR_H */