include/asm-avr32/pgalloc.h

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __ASM_AVR32_PGALLOC_H
   9 #define __ASM_AVR32_PGALLOC_H
  10
  11 #include <asm/processor.h>
  12 #include <linux/threads.h>
  13 #include <linux/slab.h>
  14 #include <linux/mm.h>
  15
  16 #define pmd_populate_kernel(mm, pmd, pte) \
  17         set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))
  18
  19 static __inline__ void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  20                                     pgtable_t pte)
  21 {
  22         set_pmd(pmd, __pmd(_PAGE_TABLE + page_to_phys(pte)));
  23 }
  24 #define pmd_pgtable(pmd) pmd_page(pmd)
  25
  26 /*
  27  * Allocate and free page tables
  28  */
  29 static __inline__ pgd_t *pgd_alloc(struct mm_struct *mm)
  30 {
  31         return kcalloc(USER_PTRS_PER_PGD, sizeof(pgd_t), GFP_KERNEL);
  32 }
  33
  34 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  35 {
  36         kfree(pgd);
  37 }
  38
  39 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  40                                           unsigned long address)
  41 {
  42         pte_t *pte;
  43
  44         pte = (pte_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
  45
  46         return pte;
  47 }
  48
  49 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  50                                          unsigned long address)
  51 {
  52         struct page *pte;
  53
  54         pte = alloc_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  55         if (!pte)
  56                 return NULL;
  57         pgtable_page_ctor(pte);
  58         return pte;
  59 }
  60
  61 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  62 {
  63         free_page((unsigned long)pte);
  64 }
  65
  66 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  67 {
  68         pgtable_page_dtor(pte);
  69         __free_page(pte);
  70 }
  71
  72 #define __pte_free_tlb(tlb,pte)                         \
  73 do {                                                    \
  74         pgtable_page_dtor(pte);                         \
  75         tlb_remove_page((tlb), pte);                    \
  76 } while (0)
  77
  78 #define check_pgt_cache() do { } while(0)
  79
  80 #endif /* __ASM_AVR32_PGALLOC_H */