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