include/asm-x86/pgalloc_64.h

   1 #ifndef _X86_64_PGALLOC_H
   2 #define _X86_64_PGALLOC_H
   3
   4 #include <asm/pda.h>
   5 #include <linux/threads.h>
   6 #include <linux/mm.h>
   7
   8 #define pmd_populate_kernel(mm, pmd, pte) \
   9                 set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
  10 #define pud_populate(mm, pud, pmd) \
  11                 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))
  12 #define pgd_populate(mm, pgd, pud) \
  13                 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
  14
  15 #define pmd_pgtable(pmd) pmd_page(pmd)
  16
  17 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
  18 {
  19         set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
  20 }
  21
  22 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  23 {
  24         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  25         free_page((unsigned long)pmd);
  26 }
  27
  28 static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
  29 {
  30         return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  31 }
  32
  33 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  34 {
  35         return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  36 }
  37
  38 static inline void pud_free (struct mm_struct *mm, pud_t *pud)
  39 {
  40         BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
  41         free_page((unsigned long)pud);
  42 }
  43
  44 static inline void pgd_list_add(pgd_t *pgd)
  45 {
  46         struct page *page = virt_to_page(pgd);
  47
  48         spin_lock(&pgd_lock);
  49         list_add(&page->lru, &pgd_list);
  50         spin_unlock(&pgd_lock);
  51 }
  52
  53 static inline void pgd_list_del(pgd_t *pgd)
  54 {
  55         struct page *page = virt_to_page(pgd);
  56
  57         spin_lock(&pgd_lock);
  58         list_del(&page->lru);
  59         spin_unlock(&pgd_lock);
  60 }
  61
  62 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  63 {
  64         unsigned boundary;
  65         pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
  66         if (!pgd)
  67                 return NULL;
  68         pgd_list_add(pgd);
  69         /*
  70          * Copy kernel pointers in from init.
  71          * Could keep a freelist or slab cache of those because the kernel
  72          * part never changes.
  73          */
  74         boundary = pgd_index(__PAGE_OFFSET);
  75         memset(pgd, 0, boundary * sizeof(pgd_t));
  76         memcpy(pgd + boundary,
  77                init_level4_pgt + boundary,
  78                (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
  79         return pgd;
  80 }
  81
  82 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  83 {
  84         BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
  85         pgd_list_del(pgd);
  86         free_page((unsigned long)pgd);
  87 }
  88
  89 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
  90 {
  91         return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  92 }
  93
  94 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
  95 {
  96         struct page *page;
  97         void *p;
  98
  99         p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 100         if (!p)
 101                 return NULL;
 102         page = virt_to_page(p);
 103         pgtable_page_ctor(page);
 104         return page;
 105 }
 106
 107 /* Should really implement gc for free page table pages. This could be
 108    done with a reference count in struct page. */
 109
 110 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 111 {
 112         BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
 113         free_page((unsigned long)pte);
 114 }
 115
 116 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 117 {
 118         pgtable_page_dtor(pte);
 119         __free_page(pte);
 120 }
 121
 122 #define __pte_free_tlb(tlb,pte)                         \
 123 do {                                                    \
 124         pgtable_page_dtor((pte));                               \
 125         tlb_remove_page((tlb), (pte));                  \
 126 } while (0)
 127
 128 #define __pmd_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
 129 #define __pud_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
 130
 131 #endif /* _X86_64_PGALLOC_H */