release/src-rt-6.x/linux/linux-2.6/include/asm-um/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 #define PGDIR_SHIFT     30
  15 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  16 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  17
  18 /* PMD_SHIFT determines the size of the area a second-level page table can
  19  * map
  20  */
  21
  22 #define PMD_SHIFT       21
  23 #define PMD_SIZE        (1UL << PMD_SHIFT)
  24 #define PMD_MASK        (~(PMD_SIZE-1))
  25
  26 /*
  27  * entries per page directory level
  28  */
  29
  30 #define PTRS_PER_PTE 512
  31 #define PTRS_PER_PMD 512
  32 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  33 #define PTRS_PER_PGD 512
  34 #define FIRST_USER_ADDRESS      0
  35
  36 #define pte_ERROR(e) \
  37         printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  38                pte_val(e))
  39 #define pmd_ERROR(e) \
  40         printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  41                pmd_val(e))
  42 #define pgd_ERROR(e) \
  43         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  44                pgd_val(e))
  45
  46 #define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  47 #define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  48 #define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  49 #define pud_populate(mm, pud, pmd) \
  50         set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  51
  52 #define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
  53 static inline int pgd_newpage(pgd_t pgd)
  54 {
  55         return(pgd_val(pgd) & _PAGE_NEWPAGE);
  56 }
  57
  58 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  59
  60 #define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
  61
  62 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  63 {
  64         pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
  65
  66         if(pmd)
  67                 memset(pmd, 0, PAGE_SIZE);
  68
  69         return pmd;
  70 }
  71
  72 extern inline void pud_clear (pud_t *pud)
  73 {
  74         set_pud(pud, __pud(0));
  75 }
  76
  77 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
  78 #define pud_page_vaddr(pud) \
  79         ((struct page *) __va(pud_val(pud) & PAGE_MASK))
  80
  81 /* Find an entry in the second-level page table.. */
  82 #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
  83                         pmd_index(address))
  84
  85 static inline unsigned long pte_pfn(pte_t pte)
  86 {
  87         return phys_to_pfn(pte_val(pte));
  88 }
  89
  90 static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
  91 {
  92         pte_t pte;
  93         phys_t phys = pfn_to_phys(page_nr);
  94
  95         pte_set_val(pte, phys, pgprot);
  96         return pte;
  97 }
  98
  99 static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
 100 {
 101         return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 102 }
 103
 104 /*
 105  * Bits 0 through 3 are taken in the low part of the pte,
 106  * put the 32 bits of offset into the high part.
 107  */
 108 #define PTE_FILE_MAX_BITS       32
 109
 110 #ifdef CONFIG_64BIT
 111
 112 #define pte_to_pgoff(p) ((p).pte >> 32)
 113
 114 #define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
 115
 116 #else
 117
 118 #define pte_to_pgoff(pte) ((pte).pte_high)
 119
 120 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 121
 122 #endif
 123
 124 #endif
 125
 126 /*
 127  * Overrides for Emacs so that we follow Linus's tabbing style.
 128  * Emacs will notice this stuff at the end of the file and automatically
 129  * adjust the settings for this buffer only.  This must remain at the end
 130  * of the file.
 131  * ---------------------------------------------------------------------------
 132  * Local variables:
 133  * c-file-style: "linux"
 134  * End:
 135  */