release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/include/asm/pgalloc.h

   1 #ifndef __ASM_SH_PGALLOC_H
   2 #define __ASM_SH_PGALLOC_H
   3
   4 #include <linux/quicklist.h>
   5 #include <asm/page.h>
   6
   7 #define QUICK_PT 0      /* Other page table pages that are zero on free */
   8
   9 extern pgd_t *pgd_alloc(struct mm_struct *);
  10 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  11
  12 #if PAGETABLE_LEVELS > 2
  13 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
  14 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
  15 extern void pmd_free(struct mm_struct *mm, pmd_t *pmd);
  16 #endif
  17
  18 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  19                                        pte_t *pte)
  20 {
  21         set_pmd(pmd, __pmd((unsigned long)pte));
  22 }
  23
  24 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  25                                 pgtable_t pte)
  26 {
  27         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  28 }
  29 #define pmd_pgtable(pmd) pmd_page(pmd)
  30
  31 /*
  32  * Allocate and free page tables.
  33  */
  34 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  35                                           unsigned long address)
  36 {
  37         return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  38 }
  39
  40 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  41                                         unsigned long address)
  42 {
  43         struct page *page;
  44         void *pg;
  45
  46         pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  47         if (!pg)
  48                 return NULL;
  49         page = virt_to_page(pg);
  50         pgtable_page_ctor(page);
  51         return page;
  52 }
  53
  54 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  55 {
  56         quicklist_free(QUICK_PT, NULL, pte);
  57 }
  58
  59 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  60 {
  61         pgtable_page_dtor(pte);
  62         quicklist_free_page(QUICK_PT, NULL, pte);
  63 }
  64
  65 #define __pte_free_tlb(tlb,pte,addr)                    \
  66 do {                                                    \
  67         pgtable_page_dtor(pte);                         \
  68         tlb_remove_page((tlb), (pte));                  \
  69 } while (0)
  70
  71 static inline void check_pgt_cache(void)
  72 {
  73         quicklist_trim(QUICK_PT, NULL, 25, 16);
  74 }
  75
  76 #endif /* __ASM_SH_PGALLOC_H */