LXR linux/include/asm-i386/pgalloc.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(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)                       \
  19do {                                                            \
  20        paravirt_alloc_pt(__pa(pte) >> PAGE_SHIFT);             \
  21        set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)));           \
  22} while (0)
  23
  24#define pmd_populate(mm, pmd, pte)                              \
  25do {                                                            \
  26        paravirt_alloc_pt(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
  32/*
  33 * Allocate and free page tables.
  34 */
  35extern pgd_t *pgd_alloc(struct mm_struct *);
  36extern void pgd_free(pgd_t *pgd);
  37
  38extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  39extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
  40
  41static inline void pte_free_kernel(pte_t *pte)
  42{
  43        free_page((unsigned long)pte);
  44}
  45
  46static inline void pte_free(struct page *pte)
  47{
  48        __free_page(pte);
  49}
  50
  51
  52#define __pte_free_tlb(tlb,pte)                                         \
  53do {                                                                    \
  54        paravirt_release_pt(page_to_pfn(pte));                          \
  55        tlb_remove_page((tlb),(pte));                                   \
  56} while (0)
  57
  58#ifdef CONFIG_X86_PAE
  59/*
  60 * In the PAE case we free the pmds as part of the pgd.
  61 */
  62#define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
  63#define pmd_free(x)                     do { } while (0)
  64#define __pmd_free_tlb(tlb,x)           do { } while (0)
  65#define pud_populate(mm, pmd, pte)      BUG()
  66#endif
  67
  68#endif /* _I386_PGALLOC_H */
  69