442 lines
12 KiB
C
442 lines
12 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Derived from include/asm-i386/pgtable.h
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* Licensed under the GPL
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*/
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#ifndef __UM_PGTABLE_H
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#define __UM_PGTABLE_H
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#include "linux/sched.h"
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#include "asm/processor.h"
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#include "asm/page.h"
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#include "asm/fixmap.h"
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extern void *um_virt_to_phys(struct task_struct *task, unsigned long virt,
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pte_t *pte_out);
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/* zero page used for uninitialized stuff */
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extern unsigned long *empty_zero_page;
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#define pgtable_cache_init() do ; while (0)
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/* PMD_SHIFT determines the size of the area a second-level page table can map */
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#define PMD_SHIFT 22
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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/* PGDIR_SHIFT determines what a third-level page table entry can map */
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#define PGDIR_SHIFT 22
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/*
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* entries per page directory level: the i386 is two-level, so
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* we don't really have any PMD directory physically.
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*/
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#define PTRS_PER_PTE 1024
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PGD 1024
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#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
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#define FIRST_USER_PGD_NR 0
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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/*
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* pgd entries used up by user/kernel:
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*/
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#define USER_PGD_PTRS (TASK_SIZE >> PGDIR_SHIFT)
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#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
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#ifndef __ASSEMBLY__
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/* Just any arbitrary offset to the start of the vmalloc VM area: the
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* current 8MB value just means that there will be a 8MB "hole" after the
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* physical memory until the kernel virtual memory starts. That means that
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* any out-of-bounds memory accesses will hopefully be caught.
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* The vmalloc() routines leaves a hole of 4kB between each vmalloced
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* area for the same reason. ;)
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*/
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extern unsigned long end_iomem;
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#define VMALLOC_OFFSET (__va_space)
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#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
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#ifdef CONFIG_HIGHMEM
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# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
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#else
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# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
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#endif
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#define _PAGE_PRESENT 0x001
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#define _PAGE_NEWPAGE 0x002
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#define _PAGE_NEWPROT 0x004
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#define _PAGE_FILE 0x008 /* set:pagecache unset:swap */
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#define _PAGE_PROTNONE 0x010 /* If not present */
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#define _PAGE_RW 0x020
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#define _PAGE_USER 0x040
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#define _PAGE_ACCESSED 0x080
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#define _PAGE_DIRTY 0x100
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#define REGION_MASK 0xf0000000
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#define REGION_SHIFT 28
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#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
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#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED)
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/*
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* The i386 can't do page protection for execute, and considers that the same are read.
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* Also, write permissions imply read permissions. This is the closest we can get..
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*/
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY
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#define __P101 PAGE_READONLY
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#define __P110 PAGE_COPY
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#define __P111 PAGE_COPY
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY
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#define __S101 PAGE_READONLY
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#define __S110 PAGE_SHARED
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#define __S111 PAGE_SHARED
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/*
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* Define this if things work differently on an i386 and an i486:
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* it will (on an i486) warn about kernel memory accesses that are
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* done without a 'verify_area(VERIFY_WRITE,..)'
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*/
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#undef TEST_VERIFY_AREA
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/* page table for 0-4MB for everybody */
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extern unsigned long pg0[1024];
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/*
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* BAD_PAGETABLE is used when we need a bogus page-table, while
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* BAD_PAGE is used for a bogus page.
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*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern pte_t __bad_page(void);
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extern pte_t * __bad_pagetable(void);
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#define BAD_PAGETABLE __bad_pagetable()
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#define BAD_PAGE __bad_page()
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#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
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/* number of bits that fit into a memory pointer */
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#define BITS_PER_PTR (8*sizeof(unsigned long))
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/* to align the pointer to a pointer address */
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#define PTR_MASK (~(sizeof(void*)-1))
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/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
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/* 64-bit machines, beware! SRB. */
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#define SIZEOF_PTR_LOG2 2
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/* to find an entry in a page-table */
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#define PAGE_PTR(address) \
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((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
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#define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE)
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#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
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#define pte_clear(xp) do { pte_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
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#define pmd_none(x) (!(pmd_val(x) & ~_PAGE_NEWPAGE))
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#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
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#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
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#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
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#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
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#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
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/*
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* The "pgd_xxx()" functions here are trivial for a folded two-level
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* setup: the pgd is never bad, and a pmd always exists (as it's folded
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* into the pgd entry)
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*/
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static inline int pgd_none(pgd_t pgd) { return 0; }
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static inline int pgd_bad(pgd_t pgd) { return 0; }
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static inline int pgd_present(pgd_t pgd) { return 1; }
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static inline void pgd_clear(pgd_t * pgdp) { }
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#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
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#define pte_page(pte) phys_to_page(pte_val(pte))
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#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
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#define pte_pfn(x) phys_to_pfn(pte_val(x))
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#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
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extern struct page *phys_to_page(const unsigned long phys);
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extern struct page *__virt_to_page(const unsigned long virt);
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#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
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/*
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* Bits 0 through 3 are taken
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*/
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#define PTE_FILE_MAX_BITS 28
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#define pte_to_pgoff(pte) ((pte).pte_low >> 4)
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#define pgoff_to_pte(off) \
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((pte_t) { ((off) << 4) + _PAGE_FILE })
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static inline pte_t pte_mknewprot(pte_t pte)
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{
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pte_val(pte) |= _PAGE_NEWPROT;
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return(pte);
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}
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static inline pte_t pte_mknewpage(pte_t pte)
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{
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pte_val(pte) |= _PAGE_NEWPAGE;
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return(pte);
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}
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static inline void set_pte(pte_t *pteptr, pte_t pteval)
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{
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/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
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* fix_range knows to unmap it. _PAGE_NEWPROT is specific to
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* mapped pages.
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*/
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*pteptr = pte_mknewpage(pteval);
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if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
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}
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/*
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* (pmds are folded into pgds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
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#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_user(pte_t pte)
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{
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return((pte_val(pte) & _PAGE_USER) &&
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!(pte_val(pte) & _PAGE_PROTNONE));
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}
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static inline int pte_read(pte_t pte)
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{
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return((pte_val(pte) & _PAGE_USER) &&
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!(pte_val(pte) & _PAGE_PROTNONE));
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}
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static inline int pte_exec(pte_t pte){
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return((pte_val(pte) & _PAGE_USER) &&
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!(pte_val(pte) & _PAGE_PROTNONE));
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}
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static inline int pte_write(pte_t pte)
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{
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return((pte_val(pte) & _PAGE_RW) &&
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!(pte_val(pte) & _PAGE_PROTNONE));
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}
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/*
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* The following only works if pte_present() is not true.
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*/
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static inline int pte_file(pte_t pte)
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{
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return (pte).pte_low & _PAGE_FILE;
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}
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
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static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
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static inline int pte_newpage(pte_t pte) { return pte_val(pte) & _PAGE_NEWPAGE; }
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static inline int pte_newprot(pte_t pte)
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{
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return(pte_present(pte) && (pte_val(pte) & _PAGE_NEWPROT));
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}
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static inline pte_t pte_rdprotect(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_USER;
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return(pte_mknewprot(pte));
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}
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static inline pte_t pte_exprotect(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_USER;
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return(pte_mknewprot(pte));
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}
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static inline pte_t pte_mkclean(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_DIRTY;
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return(pte);
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_ACCESSED;
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return(pte);
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_RW;
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return(pte_mknewprot(pte));
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}
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static inline pte_t pte_mkread(pte_t pte)
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{
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pte_val(pte) |= _PAGE_USER;
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return(pte_mknewprot(pte));
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}
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static inline pte_t pte_mkexec(pte_t pte)
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{
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pte_val(pte) |= _PAGE_USER;
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return(pte_mknewprot(pte));
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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pte_val(pte) |= _PAGE_DIRTY;
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return(pte);
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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pte_val(pte) |= _PAGE_ACCESSED;
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return(pte);
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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pte_val(pte) |= _PAGE_RW;
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return(pte_mknewprot(pte));
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}
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static inline pte_t pte_mkuptodate(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_NEWPAGE;
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if(pte_present(pte)) pte_val(pte) &= ~_PAGE_NEWPROT;
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return(pte);
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}
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extern unsigned long page_to_phys(struct page *page);
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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extern pte_t mk_pte(struct page *page, pgprot_t pgprot);
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
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if(pte_present(pte)) pte = pte_mknewpage(pte_mknewprot(pte));
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return pte;
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}
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#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
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/*
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* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
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*
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* this macro returns the index of the entry in the pgd page which would
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* control the given virtual address
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*/
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#define pgd_index(address) ((address >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
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/*
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* pgd_offset() returns a (pgd_t *)
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* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
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*/
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#define pgd_offset(mm, address) \
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((mm)->pgd + ((address) >> PGDIR_SHIFT))
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/*
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* a shortcut which implies the use of the kernel's pgd, instead
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* of a process's
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*/
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#define pgd_offset_k(address) pgd_offset(&init_mm, address)
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#define pmd_index(address) \
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(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
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/* Find an entry in the second-level page table.. */
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static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
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{
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return (pmd_t *) dir;
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}
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/*
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* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
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*
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* this macro returns the index of the entry in the pte page which would
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* control the given virtual address
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*/
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#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
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#define pte_offset_kernel(dir, address) \
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((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address))
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#define pte_offset_map(dir, address) \
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((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
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#define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
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#define pte_unmap(pte) do { } while (0)
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#define pte_unmap_nested(pte) do { } while (0)
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#define update_mmu_cache(vma,address,pte) do ; while (0)
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/* Encode and de-code a swap entry */
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#define __swp_type(x) (((x).val >> 4) & 0x3f)
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#define __swp_offset(x) ((x).val >> 11)
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#define __swp_entry(type, offset) \
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((swp_entry_t) { ((type) << 4) | ((offset) << 11) })
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#define __pte_to_swp_entry(pte) \
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((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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#define kern_addr_valid(addr) (1)
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#include <asm-generic/pgtable.h>
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#endif
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#endif
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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