linux/include/asm-x86/pgalloc_64.h
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   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
  15static 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
  20static inline void pmd_free(pmd_t *pmd)
  21{
  22        BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  23        free_page((unsigned long)pmd);
  24}
  25
  26static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
  27{
  28        return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  29}
  30
  31static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  32{
  33        return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  34}
  35
  36static inline void pud_free (pud_t *pud)
  37{
  38        BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
  39        free_page((unsigned long)pud);
  40}
  41
  42static inline void pgd_list_add(pgd_t *pgd)
  43{
  44        struct page *page = virt_to_page(pgd);
  45
  46        spin_lock(&pgd_lock);
  47        list_add(&page->lru, &pgd_list);
  48        spin_unlock(&pgd_lock);
  49}
  50
  51static inline void pgd_list_del(pgd_t *pgd)
  52{
  53        struct page *page = virt_to_page(pgd);
  54
  55        spin_lock(&pgd_lock);
  56        list_del(&page->lru);
  57        spin_unlock(&pgd_lock);
  58}
  59
  60static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  61{
  62        unsigned boundary;
  63        pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
  64        if (!pgd)
  65                return NULL;
  66        pgd_list_add(pgd);
  67        /*
  68         * Copy kernel pointers in from init.
  69         * Could keep a freelist or slab cache of those because the kernel
  70         * part never changes.
  71         */
  72        boundary = pgd_index(__PAGE_OFFSET);
  73        memset(pgd, 0, boundary * sizeof(pgd_t));
  74        memcpy(pgd + boundary,
  75               init_level4_pgt + boundary,
  76               (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
  77        return pgd;
  78}
  79
  80static inline void pgd_free(pgd_t *pgd)
  81{
  82        BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
  83        pgd_list_del(pgd);
  84        free_page((unsigned long)pgd);
  85}
  86
  87static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
  88{
  89        return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  90}
  91
  92static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
  93{
  94        void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  95        if (!p)
  96                return NULL;
  97        return virt_to_page(p);
  98}
  99
 100/* Should really implement gc for free page table pages. This could be
 101   done with a reference count in struct page. */
 102
 103static inline void pte_free_kernel(pte_t *pte)
 104{
 105        BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
 106        free_page((unsigned long)pte); 
 107}
 108
 109static inline void pte_free(struct page *pte)
 110{
 111        __free_page(pte);
 112} 
 113
 114#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
 115
 116#define __pmd_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
 117#define __pud_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
 118
 119#endif /* _X86_64_PGALLOC_H */
 120