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/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */

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/* Generic MTRR (Memory Type Range Register) ioctls.

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This library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Library General Public

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License as published by the Free Software Foundation; either

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version 2 of the License, or (at your option) any later version.

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This library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Library General Public License for more details.

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You should have received a copy of the GNU Library General Public

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License along with this library; if not, write to the Free

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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

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Richard Gooch may be reached by email at rgooch@atnf.csiro.au

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The postal address is:

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Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.

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#ifndef _ASM_X86_MTRR_H

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#define _ASM_X86_MTRR_H

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#include <linux/types.h>

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#include <linux/ioctl.h>

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#include <linux/errno.h>

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#define MTRR_IOCTL_BASE 'M'

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/* Warning: this structure has a different order from i386

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on x86-64. The 32bit emulation code takes care of that.

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But you need to use this for 64bit, otherwise your X server

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will break. */

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#ifdef __i386__

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struct mtrr_sentry {

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unsigned long base; /* Base address */

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unsigned int size; /* Size of region */

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unsigned int type; /* Type of region */

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};

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struct mtrr_gentry {

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unsigned int regnum; /* Register number */

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unsigned long base; /* Base address */

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unsigned int size; /* Size of region */

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unsigned int type; /* Type of region */

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};

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#else /* __i386__ */

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struct mtrr_sentry {

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__u64 base; /* Base address */

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__u32 size; /* Size of region */

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__u32 type; /* Type of region */

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};

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struct mtrr_gentry {

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__u64 base; /* Base address */

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__u32 size; /* Size of region */

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__u32 regnum; /* Register number */

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__u32 type; /* Type of region */

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__u32 _pad; /* Unused */

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};

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#endif /* !__i386__ */

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struct mtrr_var_range {

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__u32 base_lo;

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__u32 base_hi;

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__u32 mask_lo;

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__u32 mask_hi;

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};

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/* In the Intel processor's MTRR interface, the MTRR type is always held in

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an 8 bit field: */

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typedef __u8 mtrr_type;

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#define MTRR_NUM_FIXED_RANGES 88

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#define MTRR_MAX_VAR_RANGES 256

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struct mtrr_state_type {

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struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];

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mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];

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unsigned char enabled;

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unsigned char have_fixed;

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mtrr_type def_type;

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};

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#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))

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#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)

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/* These are the various ioctls */

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#define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)

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#define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)

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#define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)

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#define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)

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#define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)

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#define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)

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#define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)

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#define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)

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#define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)

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#define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)

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/* MTRR memory types, which are defined in SDM */

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#define MTRR_TYPE_UNCACHABLE 0

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#define MTRR_TYPE_WRCOMB 1

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/*#define MTRR_TYPE_ 2*/

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/*#define MTRR_TYPE_ 3*/

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#define MTRR_TYPE_WRTHROUGH 4

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#define MTRR_TYPE_WRPROT 5

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#define MTRR_TYPE_WRBACK 6

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#define MTRR_NUM_TYPES 7

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* Invalid MTRR memory type. mtrr_type_lookup() returns this value when

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* MTRRs are disabled. Note, this value is allocated from the reserved

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* values (0x7-0xff) of the MTRR memory types.

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#define MTRR_TYPE_INVALID 0xff

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#endif /* _ASM_X86_MTRR_H */

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