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/memtype.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
  35 extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform);
  36 extern void mtrr_save_fixed_ranges(void *);
  37 extern void mtrr_save_state(void);
  38 extern int mtrr_add(unsigned long base, unsigned long size,
  39                     unsigned int type, bool increment);
  40 extern int mtrr_add_page(unsigned long base, unsigned long size,
  41                          unsigned int type, bool increment);
  42 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
  43 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
  44 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
  45 extern void mtrr_ap_init(void);
  46 extern void mtrr_bp_init(void);
  47 extern void set_mtrr_aps_delayed_init(void);
  48 extern void mtrr_aps_init(void);
  49 extern void mtrr_bp_restore(void);
  50 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
  51 extern int amd_special_default_mtrr(void);
  52 #  else
  53 static 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)
  62 static inline int mtrr_add(unsigned long base, unsigned long size,
  63                            unsigned int type, bool increment)
  64 {
  65     return -ENODEV;
  66 }
  67 static inline int mtrr_add_page(unsigned long base, unsigned long size,
  68                                 unsigned int type, bool increment)
  69 {
  70     return -ENODEV;
  71 }
  72 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
  73 {
  74     return -ENODEV;
  75 }
  76 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
  77 {
  78     return -ENODEV;
  79 }
  80 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
  81 {
  82         return 0;
  83 }
  84 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
  85 {
  86 }
  87 static inline void mtrr_bp_init(void)
  88 {
  89         pat_disable("PAT support disabled because CONFIG_MTRR is disabled in the kernel.");
  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
 101 struct 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
 107 struct 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 */