release/src-rt-6.x.4708/linux/linux-2.6.36/arch/um/include/asm/pgtable-3level.h

   1 /*
   2  * Copyright 2003 PathScale Inc
   3  * Derived from include/asm-i386/pgtable.h
   4  * Licensed under the GPL
   5  */
   6
   7 #ifndef __UM_PGTABLE_3LEVEL_H
   8 #define __UM_PGTABLE_3LEVEL_H
   9
  10 #include <asm-generic/pgtable-nopud.h>
  11
  12 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  13
  14 #ifdef CONFIG_64BIT
  15 #define PGDIR_SHIFT     30
  16 #else
  17 #define PGDIR_SHIFT     31
  18 #endif
  19 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  20 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  21
  22 /* PMD_SHIFT determines the size of the area a second-level page table can
  23  * map
  24  */
  25
  26 #define PMD_SHIFT       21
  27 #define PMD_SIZE        (1UL << PMD_SHIFT)
  28 #define PMD_MASK        (~(PMD_SIZE-1))
  29
  30 /*
  31  * entries per page directory level
  32  */
  33
  34 #define PTRS_PER_PTE 512
  35 #ifdef CONFIG_64BIT
  36 #define PTRS_PER_PMD 512
  37 #define PTRS_PER_PGD 512
  38 #else
  39 #define PTRS_PER_PMD 1024
  40 #define PTRS_PER_PGD 1024
  41 #endif
  42
  43 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  44 #define FIRST_USER_ADDRESS      0
  45
  46 #define pte_ERROR(e) \
  47         printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  48                pte_val(e))
  49 #define pmd_ERROR(e) \
  50         printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  51                pmd_val(e))
  52 #define pgd_ERROR(e) \
  53         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  54                pgd_val(e))
  55
  56 #define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  57 #define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  58 #define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  59 #define pud_populate(mm, pud, pmd) \
  60         set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  61
  62 #ifdef CONFIG_64BIT
  63 #define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
  64 #else
  65 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  66 #endif
  67
  68 static inline int pgd_newpage(pgd_t pgd)
  69 {
  70         return(pgd_val(pgd) & _PAGE_NEWPAGE);
  71 }
  72
  73 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  74
  75 #ifdef CONFIG_64BIT
  76 #define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
  77 #else
  78 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  79 #endif
  80
  81 struct mm_struct;
  82 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
  83
  84 static inline void pud_clear (pud_t *pud)
  85 {
  86         set_pud(pud, __pud(_PAGE_NEWPAGE));
  87 }
  88
  89 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
  90 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
  91
  92 /* Find an entry in the second-level page table.. */
  93 #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
  94                         pmd_index(address))
  95
  96 static inline unsigned long pte_pfn(pte_t pte)
  97 {
  98         return phys_to_pfn(pte_val(pte));
  99 }
 100
 101 static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
 102 {
 103         pte_t pte;
 104         phys_t phys = pfn_to_phys(page_nr);
 105
 106         pte_set_val(pte, phys, pgprot);
 107         return pte;
 108 }
 109
 110 static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
 111 {
 112         return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 113 }
 114
 115 /*
 116  * Bits 0 through 3 are taken in the low part of the pte,
 117  * put the 32 bits of offset into the high part.
 118  */
 119 #define PTE_FILE_MAX_BITS       32
 120
 121 #ifdef CONFIG_64BIT
 122
 123 #define pte_to_pgoff(p) ((p).pte >> 32)
 124
 125 #define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
 126
 127 #else
 128
 129 #define pte_to_pgoff(pte) ((pte).pte_high)
 130
 131 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 132
 133 #endif
 134
 135 #endif