linux/arch/x86/include/uapi/asm/mtrr.h

/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
/*  Generic MTRR (Memory Type Range Register) ioctls.

    Copyright (C) 1997-1999  Richard Gooch

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    Richard Gooch may be reached by email at  [email protected]
    The postal address is:
      Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
*/
#ifndef _UAPI_ASM_X86_MTRR_H
#define _UAPI_ASM_X86_MTRR_H

#include <linux/types.h>
#include <linux/ioctl.h>
#include <linux/errno.h>

#define MTRR_IOCTL_BASE …

/* Warning: this structure has a different order from i386
   on x86-64. The 32bit emulation code takes care of that.
   But you need to use this for 64bit, otherwise your X server
   will break. */

#ifdef __i386__
struct mtrr_sentry {
    unsigned long base;    /*  Base address     */
    unsigned int size;    /*  Size of region   */
    unsigned int type;     /*  Type of region   */
};

struct mtrr_gentry {
    unsigned int regnum;   /*  Register number  */
    unsigned long base;    /*  Base address     */
    unsigned int size;    /*  Size of region   */
    unsigned int type;     /*  Type of region   */
};

#else /* __i386__ */

struct mtrr_sentry { … };

struct mtrr_gentry { … };

#endif /* !__i386__ */

struct mtrr_var_range { … };

/* In the Intel processor's MTRR interface, the MTRR type is always held in
   an 8 bit field: */
mtrr_type;

#define MTRR_NUM_FIXED_RANGES …
#define MTRR_MAX_VAR_RANGES …

#define MTRRphysBase_MSR(reg) …
#define MTRRphysMask_MSR(reg) …

/*  These are the various ioctls  */
#define MTRRIOC_ADD_ENTRY …
#define MTRRIOC_SET_ENTRY …
#define MTRRIOC_DEL_ENTRY …
#define MTRRIOC_GET_ENTRY …
#define MTRRIOC_KILL_ENTRY …
#define MTRRIOC_ADD_PAGE_ENTRY …
#define MTRRIOC_SET_PAGE_ENTRY …
#define MTRRIOC_DEL_PAGE_ENTRY …
#define MTRRIOC_GET_PAGE_ENTRY …
#define MTRRIOC_KILL_PAGE_ENTRY …

/* MTRR memory types, which are defined in SDM */
#define MTRR_TYPE_UNCACHABLE …
#define MTRR_TYPE_WRCOMB …
/*#define MTRR_TYPE_         2*/
/*#define MTRR_TYPE_         3*/
#define MTRR_TYPE_WRTHROUGH …
#define MTRR_TYPE_WRPROT …
#define MTRR_TYPE_WRBACK …
#define MTRR_NUM_TYPES …

/*
 * Invalid MTRR memory type.  No longer used outside of MTRR code.
 * Note, this value is allocated from the reserved values (0x7-0xff) of
 * the MTRR memory types.
 */
#define MTRR_TYPE_INVALID …

#endif /* _UAPI_ASM_X86_MTRR_H */