arch/x86/include/asm/pgtable_32.h

   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
  25 struct mm_struct;
  26 struct vm_area_struct;
  27
  28 extern pgd_t swapper_pg_dir[1024];
  29 extern pgd_t initial_page_table[1024];
  30
  31 static inline void pgtable_cache_init(void) { }
  32 static inline void check_pgt_cache(void) { }
  33 void paging_init(void);
  34
  35 extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t);
  36
  37
  38 /*
  39  * Define this if things work differently on an i386 and an i486:
  40  * it will (on an i486) warn about kernel memory accesses that are
  41  * done without a 'access_ok(VERIFY_WRITE,..)'
  42  */
  43 #undef TEST_ACCESS_OK
  44
  45 #ifdef CONFIG_X86_PAE
  46 # include <asm/pgtable-3level.h>
  47 #else
  48 # include <asm/pgtable-2level.h>
  49 #endif
  50
  51 #if defined(CONFIG_HIGHPTE)
  52 #define pte_offset_map(dir, address)                                    \
  53         ((pte_t *)kmap_atomic(pmd_page(*(dir))) +               \
  54          pte_index((address)))
  55 #define pte_unmap(pte) kunmap_atomic((pte))
  56 #else
  57 #define pte_offset_map(dir, address)                                    \
  58         ((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
  59 #define pte_unmap(pte) do { } while (0)
  60 #endif
  61
  62 /* Clear a kernel PTE and flush it from the TLB */
  63 #define kpte_clear_flush(ptep, vaddr)           \
  64 do {                                            \
  65         pte_clear(&init_mm, (vaddr), (ptep));   \
  66         __flush_tlb_one((vaddr));               \
  67 } while (0)
  68
  69 /*
  70  * The i386 doesn't have any external MMU info: the kernel page
  71  * tables contain all the necessary information.
  72  */
  73 #define update_mmu_cache(vma, address, ptep) do { } while (0)
  74 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
  75
  76 #endif /* !__ASSEMBLY__ */
  77
  78 /*
  79  * kern_addr_valid() is (1) for FLATMEM and (0) for
  80  * SPARSEMEM and DISCONTIGMEM
  81  */
  82 #ifdef CONFIG_FLATMEM
  83 #define kern_addr_valid(addr)   (1)
  84 #else
  85 #define kern_addr_valid(kaddr)  (0)
  86 #endif
  87
  88 #endif /* _ASM_X86_PGTABLE_32_H */