/********************************************************* * Copyright (C) 2002 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 # undef paravirt_map_pt_hook # define paravirt_map_pt_hook(type, va, pfn) do {} while (0) # endif #endif #include /* pte_page() API modified in 2.3.23 to return a struct page * --hpreg */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 3, 23) # define compat_pte_page pte_page #else # include "compat_page.h" # define compat_pte_page(_pte) virt_to_page(pte_page(_pte)) #endif /* Appeared in 2.5.5 --hpreg */ #ifndef pte_offset_map /* Appeared in SuSE 8.0's 2.4.18 --hpreg */ # ifdef pte_offset_atomic # define pte_offset_map pte_offset_atomic # define pte_unmap pte_kunmap # else # define pte_offset_map pte_offset # define pte_unmap(_pte) # endif #endif /* Appeared in 2.5.74-mmX --petr */ #ifndef pmd_offset_map # define pmd_offset_map(pgd, address) pmd_offset(pgd, address) # define pmd_unmap(pmd) #endif /* * Appeared in 2.6.10-rc2-mm1. Older kernels did L4 page tables as * part of pgd_offset, or they did not have L4 page tables at all. * In 2.6.11 pml4 -> pgd -> pmd -> pte hierarchy was replaced by * pgd -> pud -> pmd -> pte hierarchy. In 4.12, it was replaced by * pgd -> p4d -> pud -> pmd -> pte hierarchy (5-level page tables). */ #ifdef P4D_MASK # define compat_pgd_offset(mm, address) pgd_offset(mm, address) # define compat_pgd_present(pgd) pgd_present(pgd) # define compat_p4d_offset(pgd, address) p4d_offset(pgd, address) # define compat_p4d_present(p4d) p4d_present(p4d) # define compat_pud_offset(p4d, address) pud_offset(p4d, address) # define compat_pud_present(pud) pud_present(pud) typedef pgd_t compat_pgd_t; typedef p4d_t compat_p4d_t; typedef pud_t compat_pud_t; #elif defined(PUD_MASK) # define compat_pgd_offset(mm, address) pgd_offset(mm, address) # define compat_pgd_present(pgd) pgd_present(pgd) # define compat_p4d_offset(pgd, address) (pgd) # define compat_p4d_present(p4d) (1) # define compat_pud_offset(p4d, address) pud_offset(p4d, address) # define compat_pud_present(pud) pud_present(pud) typedef pgd_t compat_pgd_t; typedef pgd_t compat_p4d_t; typedef pud_t compat_pud_t; #elif defined(pml4_offset) # define compat_pgd_offset(mm, address) pml4_offset(mm, address) # define compat_pgd_present(pml4) pml4_present(pml4) # define compat_p4d_offset(pml4, address) (pml4) # define compat_p4d_present(pml4) (1) # define compat_pud_offset(pml4, address) pml4_pgd_offset(pml4, address) # define compat_pud_present(pgd) pgd_present(pgd) typedef pml4_t compat_pgd_t; typedef pml4_t compat_p4d_t; typedef pgd_t compat_pud_t; #else # define compat_pgd_offset(mm, address) pgd_offset(mm, address) # define compat_p4d_offset(pgd, address) (pgd) # define compat_p4d_present(p4d) (1) # define compat_pud_offset(p4d, address) (p4d) # define compat_pud_offset(pgd, address) (pgd) # define compat_pud_present(pud) (1) typedef pgd_t compat_pgd_t; typedef pgd_t compat_p4d_t; typedef pgd_t compat_pud_t; #endif #define compat_pgd_offset_k(mm, address) pgd_offset_k(address) /* Introduced somewhere in 2.6.0, + backported to some 2.4 RedHat kernels */ #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) && !defined(pte_pfn) # define pte_pfn(pte) page_to_pfn(compat_pte_page(pte)) #endif /* A page_table_lock field is added to struct mm_struct in 2.3.10 --hpreg */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 3, 10) # define compat_get_page_table_lock(_mm) (&(_mm)->page_table_lock) #else # define compat_get_page_table_lock(_mm) NULL #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 #ifdef PAGE_KERNEL_EXECUTABLE #define VM_PAGE_KERNEL_EXEC PAGE_KERNEL_EXECUTABLE #else #define VM_PAGE_KERNEL_EXEC PAGE_KERNEL_EXEC #endif #endif #endif /* __COMPAT_PGTABLE_H__ */