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 <asm/tlb.h>
   7 #include <asm-generic/tlb.h>
   8
   9 #ifdef CONFIG_PARAVIRT
  10 #include <asm/paravirt.h>
  11 #else
  12 #define paravirt_alloc_pt(mm, pfn) do { } while (0)
  13 #define paravirt_alloc_pd(mm, pfn) do { } while (0)
  14 #define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) do { } while (0)
  15 #define paravirt_release_pt(pfn) do { } while (0)
  16 #define paravirt_release_pd(pfn) do { } while (0)
  17 #endif
  18
  19 static inline void pmd_populate_kernel(struct mm_struct *mm,
  20                                        pmd_t *pmd, pte_t *pte)
  21 {
  22         paravirt_alloc_pt(mm, __pa(pte) >> PAGE_SHIFT);
  23         set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  24 }
  25
  26 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
  27 {
  28         unsigned long pfn = page_to_pfn(pte);
  29
  30         paravirt_alloc_pt(mm, pfn);
  31         set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  32 }
  33
  34 /*
  35  * Allocate and free page tables.
  36  */
  37 extern pgd_t *pgd_alloc(struct mm_struct *);
  38 extern void pgd_free(pgd_t *pgd);
  39
  40 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  41 extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
  42
  43 static inline void pte_free_kernel(pte_t *pte)
  44 {
  45         free_page((unsigned long)pte);
  46 }
  47
  48 static inline void pte_free(struct page *pte)
  49 {
  50         __free_page(pte);
  51 }
  52
  53
  54 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
  55 {
  56         paravirt_release_pt(page_to_pfn(pte));
  57         tlb_remove_page(tlb, pte);
  58 }
  59
  60 #ifdef CONFIG_X86_PAE
  61 /*
  62  * In the PAE case we free the pmds as part of the pgd.
  63  */
  64 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  65 {
  66         return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  67 }
  68
  69 static inline void pmd_free(pmd_t *pmd)
  70 {
  71         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  72         free_page((unsigned long)pmd);
  73 }
  74
  75 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
  76 {
  77         paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
  78         tlb_remove_page(tlb, virt_to_page(pmd));
  79 }
  80
  81 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
  82 {
  83         paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
  84
  85         /* Note: almost everything apart from _PAGE_PRESENT is
  86            reserved at the pmd (PDPT) level. */
  87         set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
  88
  89         /*
  90          * Pentium-II erratum A13: in PAE mode we explicitly have to flush
  91          * the TLB via cr3 if the top-level pgd is changed...
  92          */
  93         if (mm == current->active_mm)
  94                 write_cr3(read_cr3());
  95 }
  96 #endif  /* CONFIG_X86_PAE */
  97
  98 #endif /* _I386_PGALLOC_H */