140 lines
4.5 KiB
C
140 lines
4.5 KiB
C
/*********************************************************
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* Copyright (C) 2002 VMware, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 and no later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*********************************************************/
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#ifndef __COMPAT_PGTABLE_H__
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# define __COMPAT_PGTABLE_H__
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#if defined(CONFIG_PARAVIRT) && defined(CONFIG_HIGHPTE)
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# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21)
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# include <asm/paravirt.h>
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# undef paravirt_map_pt_hook
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# define paravirt_map_pt_hook(type, va, pfn) do {} while (0)
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# endif
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#endif
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#include <asm/pgtable.h>
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/* pte_page() API modified in 2.3.23 to return a struct page * --hpreg */
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 3, 23)
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# define compat_pte_page pte_page
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#else
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# include "compat_page.h"
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# define compat_pte_page(_pte) virt_to_page(pte_page(_pte))
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#endif
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/* Appeared in 2.5.5 --hpreg */
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#ifndef pte_offset_map
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/* Appeared in SuSE 8.0's 2.4.18 --hpreg */
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# ifdef pte_offset_atomic
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# define pte_offset_map pte_offset_atomic
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# define pte_unmap pte_kunmap
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# else
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# define pte_offset_map pte_offset
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# define pte_unmap(_pte)
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# endif
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#endif
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/* Appeared in 2.5.74-mmX --petr */
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#ifndef pmd_offset_map
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# define pmd_offset_map(pgd, address) pmd_offset(pgd, address)
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# define pmd_unmap(pmd)
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#endif
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/*
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* Appeared in 2.6.10-rc2-mm1. Older kernels did L4 page tables as
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* part of pgd_offset, or they did not have L4 page tables at all.
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* In 2.6.11 pml4 -> pgd -> pmd -> pte hierarchy was replaced by
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* pgd -> pud -> pmd -> pte hierarchy.
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*/
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#ifdef PUD_MASK
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# define compat_pgd_offset(mm, address) pgd_offset(mm, address)
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# define compat_pgd_present(pgd) pgd_present(pgd)
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# define compat_pud_offset(pgd, address) pud_offset(pgd, address)
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# define compat_pud_present(pud) pud_present(pud)
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typedef pgd_t compat_pgd_t;
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typedef pud_t compat_pud_t;
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#elif defined(pml4_offset)
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# define compat_pgd_offset(mm, address) pml4_offset(mm, address)
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# define compat_pgd_present(pml4) pml4_present(pml4)
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# define compat_pud_offset(pml4, address) pml4_pgd_offset(pml4, address)
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# define compat_pud_present(pgd) pgd_present(pgd)
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typedef pml4_t compat_pgd_t;
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typedef pgd_t compat_pud_t;
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#else
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# define compat_pgd_offset(mm, address) pgd_offset(mm, address)
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# define compat_pgd_present(pgd) pgd_present(pgd)
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# define compat_pud_offset(pgd, address) (pgd)
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# define compat_pud_present(pud) (1)
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typedef pgd_t compat_pgd_t;
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typedef pgd_t compat_pud_t;
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#endif
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#define compat_pgd_offset_k(mm, address) pgd_offset_k(address)
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/* Introduced somewhere in 2.6.0, + backported to some 2.4 RedHat kernels */
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) && !defined(pte_pfn)
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# define pte_pfn(pte) page_to_pfn(compat_pte_page(pte))
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#endif
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/* A page_table_lock field is added to struct mm_struct in 2.3.10 --hpreg */
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 3, 10)
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# define compat_get_page_table_lock(_mm) (&(_mm)->page_table_lock)
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#else
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# define compat_get_page_table_lock(_mm) NULL
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#endif
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/*
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* Define VM_PAGE_KERNEL_EXEC for vmapping executable pages.
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*
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* On ia32 PAGE_KERNEL_EXEC was introduced in 2.6.8.1. Unfortunately it accesses
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* __PAGE_KERNEL_EXEC which is not exported for modules. So we use
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* __PAGE_KERNEL and just cut _PAGE_NX bit from it.
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*
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* For ia32 kernels before 2.6.8.1 we use PAGE_KERNEL directly, these kernels
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* do not have noexec support.
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*
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* On x86-64 situation is a bit better: they always supported noexec, but
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* before 2.6.8.1 flag was named PAGE_KERNEL_EXECUTABLE, and it was renamed
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* to PAGE_KERNEL_EXEC when ia32 got noexec too (see above).
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*/
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#ifdef CONFIG_X86
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#ifdef _PAGE_NX
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#define VM_PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL & ~_PAGE_NX)
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#else
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#define VM_PAGE_KERNEL_EXEC PAGE_KERNEL
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#endif
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#else
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#ifdef PAGE_KERNEL_EXECUTABLE
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#define VM_PAGE_KERNEL_EXEC PAGE_KERNEL_EXECUTABLE
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#else
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#define VM_PAGE_KERNEL_EXEC PAGE_KERNEL_EXEC
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#endif
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#endif
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#endif /* __COMPAT_PGTABLE_H__ */
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