include/asm-x86/pgalloc_32.h

   1 #ifndef _I386_PGALLOC_H
   2 #define _I386_PGALLOC_H
   3
   4 #include <linux/threads.h>
   5 #include <linux/mm.h>           /* for struct page */
   6 #include <linux/pagemap.h>
   7 #include <asm/tlb.h>
   8 #include <asm-generic/tlb.h>
   9
  10 #ifdef CONFIG_PARAVIRT
  11 #include <asm/paravirt.h>
  12 #else
  13 #define paravirt_alloc_pt(mm, pfn) do { } while (0)
  14 #define paravirt_alloc_pd(mm, pfn) do { } while (0)
  15 #define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) do { } while (0)
  16 #define paravirt_release_pt(pfn) do { } while (0)
  17 #define paravirt_release_pd(pfn) do { } while (0)
  18 #endif
  19
  20 static inline void pmd_populate_kernel(struct mm_struct *mm,
  21                                        pmd_t *pmd, pte_t *pte)
  22 {
  23         paravirt_alloc_pt(mm, __pa(pte) >> PAGE_SHIFT);
  24         set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  25 }
  26
  27 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
  28 {
  29         unsigned long pfn = page_to_pfn(pte);
  30
  31         paravirt_alloc_pt(mm, pfn);
  32         set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  33 }
  34
  35 /*
  36  * Allocate and free page tables.
  37  */
  38 extern pgd_t *pgd_alloc(struct mm_struct *);
  39 extern void pgd_free(pgd_t *pgd);
  40
  41 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  42 extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
  43
  44 static inline void pte_free_kernel(pte_t *pte)
  45 {
  46         free_page((unsigned long)pte);
  47 }
  48
  49 static inline void pte_free(struct page *pte)
  50 {
  51         __free_page(pte);
  52 }
  53
  54
  55 extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  56
  57 #ifdef CONFIG_X86_PAE
  58 /*
  59  * In the PAE case we free the pmds as part of the pgd.
  60  */
  61 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  62 {
  63         return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  64 }
  65
  66 static inline void pmd_free(pmd_t *pmd)
  67 {
  68         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  69         free_page((unsigned long)pmd);
  70 }
  71
  72 extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
  73
  74 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
  75 {
  76         paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
  77
  78         /* Note: almost everything apart from _PAGE_PRESENT is
  79            reserved at the pmd (PDPT) level. */
  80         set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
  81
  82         /*
  83          * Pentium-II erratum A13: in PAE mode we explicitly have to flush
  84          * the TLB via cr3 if the top-level pgd is changed...
  85          */
  86         if (mm == current->active_mm)
  87                 write_cr3(read_cr3());
  88 }
  89 #endif  /* CONFIG_X86_PAE */
  90
  91 #endif /* _I386_PGALLOC_H */