mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 10:56:40 +00:00
3d3ca416d9
mtrr_type_lookup() returns verbatim 0xFF when MTRRs are disabled. This patch defines MTRR_TYPE_INVALID to clarify the meaning of this value, and documents its usage. Document the return values of the kernel virtual address mapping helpers pud_set_huge(), pmd_set_huge, pud_clear_huge() and pmd_clear_huge(). There is no functional change in this patch. Signed-off-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Elliott@hp.com Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luis R. Rodriguez <mcgrof@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: dave.hansen@intel.com Cc: linux-mm <linux-mm@kvack.org> Cc: pebolle@tiscali.nl Link: http://lkml.kernel.org/r/1431714237-880-5-git-send-email-toshi.kani@hp.com Link: http://lkml.kernel.org/r/1432628901-18044-5-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
/* 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 rgooch@atnf.csiro.au
|
|
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 'M'
|
|
|
|
/* 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 {
|
|
__u64 base; /* Base address */
|
|
__u32 size; /* Size of region */
|
|
__u32 type; /* Type of region */
|
|
};
|
|
|
|
struct mtrr_gentry {
|
|
__u64 base; /* Base address */
|
|
__u32 size; /* Size of region */
|
|
__u32 regnum; /* Register number */
|
|
__u32 type; /* Type of region */
|
|
__u32 _pad; /* Unused */
|
|
};
|
|
|
|
#endif /* !__i386__ */
|
|
|
|
struct mtrr_var_range {
|
|
__u32 base_lo;
|
|
__u32 base_hi;
|
|
__u32 mask_lo;
|
|
__u32 mask_hi;
|
|
};
|
|
|
|
/* In the Intel processor's MTRR interface, the MTRR type is always held in
|
|
an 8 bit field: */
|
|
typedef __u8 mtrr_type;
|
|
|
|
#define MTRR_NUM_FIXED_RANGES 88
|
|
#define MTRR_MAX_VAR_RANGES 256
|
|
|
|
struct mtrr_state_type {
|
|
struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
|
|
mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
|
|
unsigned char enabled;
|
|
unsigned char have_fixed;
|
|
mtrr_type def_type;
|
|
};
|
|
|
|
#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
|
|
#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
|
|
|
|
/* These are the various ioctls */
|
|
#define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
|
|
#define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
|
|
#define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
|
|
#define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
|
|
#define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
|
|
#define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
|
|
#define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
|
|
#define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
|
|
#define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
|
|
#define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
|
|
|
|
/* MTRR memory types, which are defined in SDM */
|
|
#define MTRR_TYPE_UNCACHABLE 0
|
|
#define MTRR_TYPE_WRCOMB 1
|
|
/*#define MTRR_TYPE_ 2*/
|
|
/*#define MTRR_TYPE_ 3*/
|
|
#define MTRR_TYPE_WRTHROUGH 4
|
|
#define MTRR_TYPE_WRPROT 5
|
|
#define MTRR_TYPE_WRBACK 6
|
|
#define MTRR_NUM_TYPES 7
|
|
|
|
/*
|
|
* Invalid MTRR memory type. mtrr_type_lookup() returns this value when
|
|
* MTRRs are disabled. Note, this value is allocated from the reserved
|
|
* values (0x7-0xff) of the MTRR memory types.
|
|
*/
|
|
#define MTRR_TYPE_INVALID 0xff
|
|
|
|
#endif /* _UAPI_ASM_X86_MTRR_H */
|