LXR linux/arch/x86/include/asm/pgtable

   1#ifndef _ASM_X86_PGTABLE_32_H
   2#define _ASM_X86_PGTABLE_32_H
   3
   4#include <asm/pgtable_32_types.h>
   5
   6/*
   7 * The Linux memory management assumes a three-level page table setup. On
   8 * the i386, we use that, but "fold" the mid level into the top-level page
   9 * table, so that we physically have the same two-level page table as the
  10 * i386 mmu expects.
  11 *
  12 * This file contains the functions and defines necessary to modify and use
  13 * the i386 page table tree.
  14 */
  15#ifndef __ASSEMBLY__
  16#include <asm/processor.h>
  17#include <asm/fixmap.h>
  18#include <linux/threads.h>
  19#include <asm/paravirt.h>
  20
  21#include <linux/bitops.h>
  22#include <linux/list.h>
  23#include <linux/spinlock.h>
  24
  25struct mm_struct;
  26struct vm_area_struct;
  27
  28extern pgd_t swapper_pg_dir[1024];
  29extern pgd_t initial_page_table[1024];
  30
  31static inline void pgtable_cache_init(void) { }
  32static inline void check_pgt_cache(void) { }
  33void paging_init(void);
  34
  35/*
  36 * Define this if things work differently on an i386 and an i486:
  37 * it will (on an i486) warn about kernel memory accesses that are
  38 * done without a 'access_ok(VERIFY_WRITE,..)'
  39 */
  40#undef TEST_ACCESS_OK
  41
  42#ifdef CONFIG_X86_PAE
  43# include <asm/pgtable-3level.h>
  44#else
  45# include <asm/pgtable-2level.h>
  46#endif
  47
  48#if defined(CONFIG_HIGHPTE)
  49#define pte_offset_map(dir, address)                                    \
  50        ((pte_t *)kmap_atomic(pmd_page(*(dir))) +               \
  51         pte_index((address)))
  52#define pte_unmap(pte) kunmap_atomic((pte))
  53#else
  54#define pte_offset_map(dir, address)                                    \
  55        ((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
  56#define pte_unmap(pte) do { } while (0)
  57#endif
  58
  59/* Clear a kernel PTE and flush it from the TLB */
  60#define kpte_clear_flush(ptep, vaddr)           \
  61do {                                            \
  62        pte_clear(&init_mm, (vaddr), (ptep));   \
  63        __flush_tlb_one((vaddr));               \
  64} while (0)
  65
  66#endif /* !__ASSEMBLY__ */
  67
  68/*
  69 * kern_addr_valid() is (1) for FLATMEM and (0) for
  70 * SPARSEMEM and DISCONTIGMEM
  71 */
  72#ifdef CONFIG_FLATMEM
  73#define kern_addr_valid(addr)   (1)
  74#else
  75#define kern_addr_valid(kaddr)  (0)
  76#endif
  77
  78#endif /* _ASM_X86_PGTABLE_32_H */
  79