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      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 (at) 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 
    109 #endif /* _ASM_X86_MTRR_H */
    110