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         unsigned long flags;
  48
  49         spin_lock_irqsave(&pgd_lock, flags);
  50         list_add(&page->lru, &pgd_list);
  51         spin_unlock_irqrestore(&pgd_lock, flags);
  52 }
  53
  54 static inline void pgd_list_del(pgd_t *pgd)
  55 {
  56         struct page *page = virt_to_page(pgd);
  57         unsigned long flags;
  58
  59         spin_lock_irqsave(&pgd_lock, flags);
  60         list_del(&page->lru);
  61         spin_unlock_irqrestore(&pgd_lock, flags);
  62 }
  63
  64 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  65 {
  66         unsigned boundary;
  67         pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
  68         if (!pgd)
  69                 return NULL;
  70         pgd_list_add(pgd);
  71         /*
  72          * Copy kernel pointers in from init.
  73          * Could keep a freelist or slab cache of those because the kernel
  74          * part never changes.
  75          */
  76         boundary = pgd_index(__PAGE_OFFSET);
  77         memset(pgd, 0, boundary * sizeof(pgd_t));
  78         memcpy(pgd + boundary,
  79                init_level4_pgt + boundary,
  80                (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
  81         return pgd;
  82 }
  83
  84 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  85 {
  86         BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
  87         pgd_list_del(pgd);
  88         free_page((unsigned long)pgd);
  89 }
  90
  91 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
  92 {
  93         return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  94 }
  95
  96 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
  97 {
  98         struct page *page;
  99         void *p;
 100
 101         p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 102         if (!p)
 103                 return NULL;
 104         page = virt_to_page(p);
 105         pgtable_page_ctor(page);
 106         return page;
 107 }
 108
 109 /* Should really implement gc for free page table pages. This could be
 110    done with a reference count in struct page. */
 111
 112 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 113 {
 114         BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
 115         free_page((unsigned long)pte);
 116 }
 117
 118 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 119 {
 120         pgtable_page_dtor(pte);
 121         __free_page(pte);
 122 }
 123
 124 #define __pte_free_tlb(tlb,pte)                         \
 125 do {                                                    \
 126         pgtable_page_dtor((pte));                               \
 127         tlb_remove_page((tlb), (pte));                  \
 128 } while (0)
 129
 130 #define __pmd_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
 131 #define __pud_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
 132
 133 #endif /* _X86_64_PGALLOC_H */