release/src-rt-6.x.4708/linux/linux-2.6.36/arch/avr32/include/asm/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 <linux/quicklist.h>
  12 #include <asm/page.h>
  13 #include <asm/pgtable.h>
  14
  15 #define QUICK_PGD       0       /* Preserve kernel mappings over free */
  16 #define QUICK_PT        1       /* Zero on free */
  17
  18 static inline void pmd_populate_kernel(struct mm_struct *mm,
  19                                        pmd_t *pmd, 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 static inline void pgd_ctor(void *x)
  32 {
  33         pgd_t *pgd = x;
  34
  35         memcpy(pgd + USER_PTRS_PER_PGD,
  36                 swapper_pg_dir + USER_PTRS_PER_PGD,
  37                 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  38 }
  39
  40 /*
  41  * Allocate and free page tables
  42  */
  43 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  44 {
  45         return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
  46 }
  47
  48 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  49 {
  50         quicklist_free(QUICK_PGD, NULL, pgd);
  51 }
  52
  53 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  54                                           unsigned long address)
  55 {
  56         return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  57 }
  58
  59 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  60                                          unsigned long address)
  61 {
  62         struct page *page;
  63         void *pg;
  64
  65         pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  66         if (!pg)
  67                 return NULL;
  68
  69         page = virt_to_page(pg);
  70         pgtable_page_ctor(page);
  71
  72         return page;
  73 }
  74
  75 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  76 {
  77         quicklist_free(QUICK_PT, NULL, pte);
  78 }
  79
  80 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  81 {
  82         pgtable_page_dtor(pte);
  83         quicklist_free_page(QUICK_PT, NULL, pte);
  84 }
  85
  86 #define __pte_free_tlb(tlb,pte,addr)                    \
  87 do {                                                    \
  88         pgtable_page_dtor(pte);                         \
  89         tlb_remove_page((tlb), pte);                    \
  90 } while (0)
  91
  92 static inline void check_pgt_cache(void)
  93 {
  94         quicklist_trim(QUICK_PGD, NULL, 25, 16);
  95         quicklist_trim(QUICK_PT, NULL, 25, 16);
  96 }
  97
  98 #endif /* __ASM_AVR32_PGALLOC_H */