LXR linux/arch/x86/include/asm/pgalloc.h

   1#ifndef _ASM_X86_PGALLOC_H
   2#define _ASM_X86_PGALLOC_H
   3
   4#include <linux/threads.h>
   5#include <linux/mm.h>           /* for struct page */
   6#include <linux/pagemap.h>
   7
   8static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
   9
  10#ifdef CONFIG_PARAVIRT
  11#include <asm/paravirt.h>
  12#else
  13#define paravirt_pgd_alloc(mm)  __paravirt_pgd_alloc(mm)
  14static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
  15static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)  {}
  16static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)  {}
  17static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
  18                                            unsigned long start, unsigned long count) {}
  19static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)  {}
  20static inline void paravirt_release_pte(unsigned long pfn) {}
  21static inline void paravirt_release_pmd(unsigned long pfn) {}
  22static inline void paravirt_release_pud(unsigned long pfn) {}
  23#endif
  24
  25/*
  26 * Flags to use when allocating a user page table page.
  27 */
  28extern gfp_t __userpte_alloc_gfp;
  29
  30/*
  31 * Allocate and free page tables.
  32 */
  33extern pgd_t *pgd_alloc(struct mm_struct *);
  34extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  35
  36extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  37extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
  38
  39/* Should really implement gc for free page table pages. This could be
  40   done with a reference count in struct page. */
  41
  42static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  43{
  44        BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
  45        free_page((unsigned long)pte);
  46}
  47
  48static inline void pte_free(struct mm_struct *mm, struct page *pte)
  49{
  50        pgtable_page_dtor(pte);
  51        __free_page(pte);
  52}
  53
  54extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  55
  56static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
  57                                  unsigned long address)
  58{
  59        ___pte_free_tlb(tlb, pte);
  60}
  61
  62static inline void pmd_populate_kernel(struct mm_struct *mm,
  63                                       pmd_t *pmd, pte_t *pte)
  64{
  65        paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
  66        set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  67}
  68
  69static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  70                                struct page *pte)
  71{
  72        unsigned long pfn = page_to_pfn(pte);
  73
  74        paravirt_alloc_pte(mm, pfn);
  75        set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  76}
  77
  78#define pmd_pgtable(pmd) pmd_page(pmd)
  79
  80#if CONFIG_PGTABLE_LEVELS > 2
  81static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  82{
  83        struct page *page;
  84        page = alloc_pages(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO, 0);
  85        if (!page)
  86                return NULL;
  87        if (!pgtable_pmd_page_ctor(page)) {
  88                __free_pages(page, 0);
  89                return NULL;
  90        }
  91        return (pmd_t *)page_address(page);
  92}
  93
  94static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  95{
  96        BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  97        pgtable_pmd_page_dtor(virt_to_page(pmd));
  98        free_page((unsigned long)pmd);
  99}
 100
 101extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
 102
 103static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 104                                  unsigned long address)
 105{
 106        ___pmd_free_tlb(tlb, pmd);
 107}
 108
 109#ifdef CONFIG_X86_PAE
 110extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
 111#else   /* !CONFIG_X86_PAE */
 112static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 113{
 114        paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
 115        set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
 116}
 117#endif  /* CONFIG_X86_PAE */
 118
 119#if CONFIG_PGTABLE_LEVELS > 3
 120static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
 121{
 122        paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
 123        set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
 124}
 125
 126static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 127{
 128        return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 129}
 130
 131static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 132{
 133        BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
 134        free_page((unsigned long)pud);
 135}
 136
 137extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
 138
 139static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 140                                  unsigned long address)
 141{
 142        ___pud_free_tlb(tlb, pud);
 143}
 144
 145#endif  /* CONFIG_PGTABLE_LEVELS > 3 */
 146#endif  /* CONFIG_PGTABLE_LEVELS > 2 */
 147
 148#endif /* _ASM_X86_PGALLOC_H */
 149