include/asm-um/pgtable-3level.h

   1
   2 /*
   3  * Copyright 2003 PathScale Inc
   4  * Derived from include/asm-i386/pgtable.h
   5  * Licensed under the GPL
   6  */
   7
   8 #ifndef __UM_PGTABLE_3LEVEL_H
   9 #define __UM_PGTABLE_3LEVEL_H
  10
  11 #include <asm-generic/pgtable-nopud.h>
  12
  13 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  14
  15 #define PGDIR_SHIFT     30
  16 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  17 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  18
  19 /* PMD_SHIFT determines the size of the area a second-level page table can
  20  * map
  21  */
  22
  23 #define PMD_SHIFT       21
  24 #define PMD_SIZE        (1UL << PMD_SHIFT)
  25 #define PMD_MASK        (~(PMD_SIZE-1))
  26
  27 /*
  28  * entries per page directory level
  29  */
  30
  31 #define PTRS_PER_PTE 512
  32 #define PTRS_PER_PMD 512
  33 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  34 #define PTRS_PER_PGD 512
  35 #define FIRST_USER_ADDRESS      0
  36
  37 #define pte_ERROR(e) \
  38         printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  39                pte_val(e))
  40 #define pmd_ERROR(e) \
  41         printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  42                pmd_val(e))
  43 #define pgd_ERROR(e) \
  44         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  45                pgd_val(e))
  46
  47 #define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  48 #define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  49 #define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  50 #define pud_populate(mm, pud, pmd) \
  51         set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  52
  53 #define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
  54 static inline int pgd_newpage(pgd_t pgd)
  55 {
  56         return(pgd_val(pgd) & _PAGE_NEWPAGE);
  57 }
  58
  59 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  60
  61 #define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
  62
  63 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  64 {
  65         pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
  66
  67         if(pmd)
  68                 memset(pmd, 0, PAGE_SIZE);
  69
  70         return pmd;
  71 }
  72
  73 static inline void pud_clear (pud_t *pud)
  74 {
  75         set_pud(pud, __pud(_PAGE_NEWPAGE));
  76 }
  77
  78 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
  79 #define pud_page_vaddr(pud) \
  80         ((struct page *) __va(pud_val(pud) & PAGE_MASK))
  81
  82 /* Find an entry in the second-level page table.. */
  83 #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
  84                         pmd_index(address))
  85
  86 static inline unsigned long pte_pfn(pte_t pte)
  87 {
  88         return phys_to_pfn(pte_val(pte));
  89 }
  90
  91 static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
  92 {
  93         pte_t pte;
  94         phys_t phys = pfn_to_phys(page_nr);
  95
  96         pte_set_val(pte, phys, pgprot);
  97         return pte;
  98 }
  99
 100 static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
 101 {
 102         return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 103 }
 104
 105 /*
 106  * Bits 0 through 3 are taken in the low part of the pte,
 107  * put the 32 bits of offset into the high part.
 108  */
 109 #define PTE_FILE_MAX_BITS       32
 110
 111 #ifdef CONFIG_64BIT
 112
 113 #define pte_to_pgoff(p) ((p).pte >> 32)
 114
 115 #define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
 116
 117 #else
 118
 119 #define pte_to_pgoff(pte) ((pte).pte_high)
 120
 121 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 122
 123 #endif
 124
 125 #endif
 126
 127 /*
 128  * Overrides for Emacs so that we follow Linus's tabbing style.
 129  * Emacs will notice this stuff at the end of the file and automatically
 130  * adjust the settings for this buffer only.  This must remain at the end
 131  * of the file.
 132  * ---------------------------------------------------------------------------
 133  * Local variables:
 134  * c-file-style: "linux"
 135  * End:
 136  */