include/asm-x86_64/pgalloc.h

   1 #ifndef _X86_64_PGALLOC_H
   2 #define _X86_64_PGALLOC_H
   3
   4 #include <asm/processor.h>
   5 #include <asm/fixmap.h>
   6 #include <asm/pda.h>
   7 #include <linux/threads.h>
   8 #include <linux/mm.h>
   9
  10 #define pmd_populate_kernel(mm, pmd, pte) \
  11                 set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
  12 #define pgd_populate(mm, pgd, pmd) \
  13                 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pmd)))
  14
  15 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
  16 {
  17         set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
  18 }
  19
  20 extern __inline__ pmd_t *get_pmd(void)
  21 {
  22         return (pmd_t *)get_zeroed_page(GFP_KERNEL);
  23 }
  24
  25 extern __inline__ void pmd_free(pmd_t *pmd)
  26 {
  27         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  28         free_page((unsigned long)pmd);
  29 }
  30
  31 static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
  32 {
  33         return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  34 }
  35
  36 static inline pgd_t *pgd_alloc (struct mm_struct *mm)
  37 {
  38         return (pgd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  39 }
  40
  41 static inline void pgd_free (pgd_t *pgd)
  42 {
  43         BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
  44         free_page((unsigned long)pgd);
  45 }
  46
  47 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
  48 {
  49         return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  50 }
  51
  52 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
  53 {
  54         void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  55         if (!p)
  56                 return NULL;
  57         return virt_to_page(p);
  58 }
  59
  60 /* Should really implement gc for free page table pages. This could be
  61    done with a reference count in struct page. */
  62
  63 extern __inline__ void pte_free_kernel(pte_t *pte)
  64 {
  65         BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
  66         free_page((unsigned long)pte);
  67 }
  68
  69 extern inline void pte_free(struct page *pte)
  70 {
  71         __free_page(pte);
  72 }
  73
  74 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
  75 #define __pmd_free_tlb(tlb,x)   pmd_free(x)
  76
  77 #endif /* _X86_64_PGALLOC_H */