include/asm-i386/pgalloc.h

   1 #ifndef _I386_PGALLOC_H
   2 #define _I386_PGALLOC_H
   3
   4 #include <asm/fixmap.h>
   5 #include <linux/threads.h>
   6 #include <linux/mm.h>           /* for struct page */
   7
   8 #ifdef CONFIG_PARAVIRT
   9 #include <asm/paravirt.h>
  10 #else
  11 #define paravirt_alloc_pt(pfn) do { } while (0)
  12 #define paravirt_alloc_pd(pfn) do { } while (0)
  13 #define paravirt_alloc_pd(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 #define pmd_populate_kernel(mm, pmd, pte)                       \
  20 do {                                                            \
  21         paravirt_alloc_pt(__pa(pte) >> PAGE_SHIFT);             \
  22         set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)));           \
  23 } while (0)
  24
  25 #define pmd_populate(mm, pmd, pte)                              \
  26 do {                                                            \
  27         paravirt_alloc_pt(page_to_pfn(pte));                    \
  28         set_pmd(pmd, __pmd(_PAGE_TABLE +                        \
  29                 ((unsigned long long)page_to_pfn(pte) <<        \
  30                         (unsigned long long) PAGE_SHIFT)));     \
  31 } while (0)
  32
  33 /*
  34  * Allocate and free page tables.
  35  */
  36 extern pgd_t *pgd_alloc(struct mm_struct *);
  37 extern void pgd_free(pgd_t *pgd);
  38
  39 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  40 extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
  41
  42 static inline void pte_free_kernel(pte_t *pte)
  43 {
  44         free_page((unsigned long)pte);
  45 }
  46
  47 static inline void pte_free(struct page *pte)
  48 {
  49         __free_page(pte);
  50 }
  51
  52
  53 #define __pte_free_tlb(tlb,pte)                                         \
  54 do {                                                                    \
  55         paravirt_release_pt(page_to_pfn(pte));                          \
  56         tlb_remove_page((tlb),(pte));                                   \
  57 } while (0)
  58
  59 #ifdef CONFIG_X86_PAE
  60 /*
  61  * In the PAE case we free the pmds as part of the pgd.
  62  */
  63 #define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
  64 #define pmd_free(x)                     do { } while (0)
  65 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  66 #define pud_populate(mm, pmd, pte)      BUG()
  67 #endif
  68
  69 #define check_pgt_cache()       do { } while (0)
  70
  71 #endif /* _I386_PGALLOC_H */