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_PGD_NR       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
  61 #define pte_present(x)  pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
  62
  63 static inline pte_t pte_mknewprot(pte_t pte)
  64 {
  65         pte_set_bits(pte, _PAGE_NEWPROT);
  66         return(pte);
  67 }
  68
  69 static inline pte_t pte_mknewpage(pte_t pte)
  70 {
  71         pte_set_bits(pte, _PAGE_NEWPAGE);
  72         return(pte);
  73 }
  74
  75 static inline void set_pte(pte_t *pteptr, pte_t pteval)
  76 {
  77         pte_copy(*pteptr, pteval);
  78
  79         /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
  80          * fix_range knows to unmap it.  _PAGE_NEWPROT is specific to
  81          * mapped pages.
  82          */
  83
  84         *pteptr = pte_mknewpage(*pteptr);
  85         if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
  86 }
  87 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  88
  89 #define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
  90
  91 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  92 {
  93         pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
  94
  95         if(pmd)
  96                 memset(pmd, 0, PAGE_SIZE);
  97
  98         return pmd;
  99 }
 100
 101 static inline void pmd_free(pmd_t *pmd){
 102         free_page((unsigned long) pmd);
 103 }
 104
 105 #define __pmd_free_tlb(tlb,x)   do { } while (0)
 106
 107 static inline void pud_clear (pud_t * pud) { }
 108
 109 #define pud_page(pud) \
 110         ((struct page *) __va(pud_val(pud) & PAGE_MASK))
 111
 112 /* Find an entry in the second-level page table.. */
 113 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
 114                         pmd_index(address))
 115
 116 #define pte_page(x) pfn_to_page(pte_pfn(x))
 117
 118 static inline int pte_none(pte_t pte)
 119 {
 120         return pte_is_zero(pte);
 121 }
 122
 123 static inline unsigned long pte_pfn(pte_t pte)
 124 {
 125         return phys_to_pfn(pte_val(pte));
 126 }
 127
 128 static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
 129 {
 130         pte_t pte;
 131         phys_t phys = pfn_to_phys(page_nr);
 132
 133         pte_set_val(pte, phys, pgprot);
 134         return pte;
 135 }
 136
 137 static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
 138 {
 139         return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 140 }
 141
 142 /*
 143  * Bits 0 through 3 are taken in the low part of the pte,
 144  * put the 32 bits of offset into the high part.
 145  */
 146 #define PTE_FILE_MAX_BITS       32
 147
 148 #ifdef CONFIG_64_BIT
 149
 150 #define pte_to_pgoff(p) ((p).pte >> 32)
 151
 152 #define pgoff_to_pte(off) ((pte_t) { ((off) < 32) | _PAGE_FILE })
 153
 154 #else
 155
 156 #define pte_to_pgoff(pte) ((pte).pte_high)
 157
 158 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 159
 160 #endif
 161
 162 #endif
 163
 164 /*
 165  * Overrides for Emacs so that we follow Linus's tabbing style.
 166  * Emacs will notice this stuff at the end of the file and automatically
 167  * adjust the settings for this buffer only.  This must remain at the end
 168  * of the file.
 169  * ---------------------------------------------------------------------------
 170  * Local variables:
 171  * c-file-style: "linux"
 172  * End:
 173  */