83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/*********************************************************
|
|
* Copyright (C) 2002-2017 VMware, Inc. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation version 2 and no later version.
|
|
*
|
|
* This program 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 General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*********************************************************/
|
|
|
|
#ifndef __COMPAT_PGTABLE_H__
|
|
# define __COMPAT_PGTABLE_H__
|
|
|
|
|
|
#if defined(CONFIG_PARAVIRT) && defined(CONFIG_HIGHPTE)
|
|
# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21)
|
|
# include <asm/paravirt.h>
|
|
# undef paravirt_map_pt_hook
|
|
# define paravirt_map_pt_hook(type, va, pfn) do {} while (0)
|
|
# endif
|
|
#endif
|
|
#include <asm/pgtable.h>
|
|
|
|
|
|
/*
|
|
* p4d level appeared in 4.12.
|
|
*/
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
|
|
# define compat_p4d_offset(pgd, address) p4d_offset(pgd, address)
|
|
# define compat_p4d_present(p4d) p4d_present(p4d)
|
|
# define compat_p4d_large(p4d) p4d_large(p4d)
|
|
# define compat_p4d_pfn(p4d) p4d_pfn(p4d)
|
|
# define COMPAT_P4D_MASK P4D_MASK
|
|
typedef p4d_t compat_p4d_t;
|
|
#else
|
|
# define compat_p4d_offset(pgd, address) (pgd)
|
|
# define compat_p4d_present(p4d) (1)
|
|
# define compat_p4d_large(p4d) (0)
|
|
# define compat_p4d_pfn(p4d) INVALID_MPN /* Not used */
|
|
# define COMPAT_P4D_MASK 0 /* Not used */
|
|
typedef pgd_t compat_p4d_t;
|
|
#endif
|
|
/* pud_pfn did not exist before 3.8. */
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 8, 0)
|
|
# define pud_pfn(pud) INVALID_MPN
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Define VM_PAGE_KERNEL_EXEC for vmapping executable pages.
|
|
*
|
|
* On ia32 PAGE_KERNEL_EXEC was introduced in 2.6.8.1. Unfortunately it accesses
|
|
* __PAGE_KERNEL_EXEC which is not exported for modules. So we use
|
|
* __PAGE_KERNEL and just cut _PAGE_NX bit from it.
|
|
*
|
|
* For ia32 kernels before 2.6.8.1 we use PAGE_KERNEL directly, these kernels
|
|
* do not have noexec support.
|
|
*
|
|
* On x86-64 situation is a bit better: they always supported noexec, but
|
|
* before 2.6.8.1 flag was named PAGE_KERNEL_EXECUTABLE, and it was renamed
|
|
* to PAGE_KERNEL_EXEC when ia32 got noexec too (see above).
|
|
*/
|
|
#ifdef CONFIG_X86
|
|
#ifdef _PAGE_NX
|
|
#define VM_PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL & ~_PAGE_NX)
|
|
#else
|
|
#define VM_PAGE_KERNEL_EXEC PAGE_KERNEL
|
|
#endif
|
|
#else
|
|
#define VM_PAGE_KERNEL_EXEC PAGE_KERNEL_EXEC
|
|
#endif
|
|
|
|
|
|
#endif /* __COMPAT_PGTABLE_H__ */
|