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
   7 #ifdef CONFIG_PARAVIRT
   8 #include <asm/paravirt.h>
   9 #else
  10 #define paravirt_alloc_pt(mm, pfn) do { } while (0)
  11 #define paravirt_alloc_pd(pfn) do { } while (0)
  12 #define paravirt_alloc_pd(pfn) do { } while (0)
  13 #define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) do { } while (0)
  14 #define paravirt_release_pt(pfn) do { } while (0)
  15 #define paravirt_release_pd(pfn) do { } while (0)
  16 #endif
  17
  18 #define pmd_populate_kernel(mm, pmd, pte)                       \
  19 do {                                                            \
  20         paravirt_alloc_pt(mm, __pa(pte) >> PAGE_SHIFT);         \
  21         set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)));           \
  22 } while (0)
  23
  24 #define pmd_populate(mm, pmd, pte)                              \
  25 do {                                                            \
  26         paravirt_alloc_pt(mm, page_to_pfn(pte));                \
  27         set_pmd(pmd, __pmd(_PAGE_TABLE +                        \
  28                 ((unsigned long long)page_to_pfn(pte) <<        \
  29                         (unsigned long long) PAGE_SHIFT)));     \
  30 } while (0)
  31 #define pmd_pgtable(pmd) pmd_page(pmd)
  32
  33 /*
  34  * Allocate and free page tables.
  35  */
  36 extern pgd_t *pgd_alloc(struct mm_struct *);
  37 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  38
  39 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  40 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
  41
  42 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  43 {
  44         free_page((unsigned long)pte);
  45 }
  46
  47 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  48 {
  49         pgtable_page_dtor(pte);
  50         __free_page(pte);
  51 }
  52
  53
  54 #define __pte_free_tlb(tlb,pte)                                         \
  55 do {                                                                    \
  56         pgtable_page_dtor(pte);                                         \
  57         paravirt_release_pt(page_to_pfn(pte));                          \
  58         tlb_remove_page((tlb),(pte));                                   \
  59 } while (0)
  60
  61 #ifdef CONFIG_X86_PAE
  62 /*
  63  * In the PAE case we free the pmds as part of the pgd.
  64  */
  65 #define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
  66 #define pmd_free(mm, x)                 do { } while (0)
  67 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  68 #define pud_populate(mm, pmd, pte)      BUG()
  69 #endif
  70
  71 #endif /* _I386_PGALLOC_H */