include/asm-sh/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_PGD 0     /* We preserve special mappings over free */
   8 #define QUICK_PT 1      /* Other page table pages that are zero on free */
   9
  10 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  11                                        pte_t *pte)
  12 {
  13         set_pmd(pmd, __pmd((unsigned long)pte));
  14 }
  15
  16 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  17                                 struct page *pte)
  18 {
  19         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  20 }
  21
  22 static inline void pgd_ctor(void *x)
  23 {
  24         pgd_t *pgd = x;
  25
  26         memcpy(pgd + USER_PTRS_PER_PGD,
  27                swapper_pg_dir + USER_PTRS_PER_PGD,
  28                (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  29 }
  30
  31 /*
  32  * Allocate and free page tables.
  33  */
  34 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  35 {
  36         return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
  37 }
  38
  39 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  40 {
  41         quicklist_free(QUICK_PGD, NULL, pgd);
  42 }
  43
  44 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  45                                           unsigned long address)
  46 {
  47         return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  48 }
  49
  50 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  51                                          unsigned long address)
  52 {
  53         void *pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  54         return pg ? virt_to_page(pg) : NULL;
  55 }
  56
  57 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  58 {
  59         quicklist_free(QUICK_PT, NULL, pte);
  60 }
  61
  62 static inline void pte_free(struct mm_struct *mm, struct page *pte)
  63 {
  64         quicklist_free_page(QUICK_PT, NULL, pte);
  65 }
  66
  67 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
  68
  69 /*
  70  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  71  * inside the pgd, so has no extra memory associated with it.
  72  */
  73
  74 #define pmd_free(mm, x)                 do { } while (0)
  75 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  76
  77 static inline void check_pgt_cache(void)
  78 {
  79         quicklist_trim(QUICK_PGD, NULL, 25, 16);
  80         quicklist_trim(QUICK_PT, NULL, 25, 16);
  81 }
  82
  83 #endif /* __ASM_SH_PGALLOC_H */