973df19420
mtrr_type_lookup() should always return a valid memory type. In case there is no information available, it should return the default UC. This will remove the last case where mtrr_type_lookup() can return MTRR_TYPE_INVALID, so adjust the comment in include/uapi/asm/mtrr.h. Note that removing the MTRR_TYPE_INVALID #define from that header could break user code, so it has to stay. At the same time the mtrr_type_lookup() stub for the !CONFIG_MTRR case should set uniform to 1, as if the memory range would be covered by no MTRR at all. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/20230502120931.20719-15-jgross@suse.com Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/* 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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Copyright (C) 1997-1999 Richard Gooch
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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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*/
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#ifndef _UAPI_ASM_X86_MTRR_H
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#define _UAPI_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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#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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/*
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* Invalid MTRR memory type. No longer used outside of MTRR code.
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* Note, this value is allocated from the reserved values (0x7-0xff) of
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* the MTRR memory types.
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*/
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#define MTRR_TYPE_INVALID 0xff
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#endif /* _UAPI_ASM_X86_MTRR_H */
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