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/mm.h>
  12 #include <linux/quicklist.h>
  13 #include <asm/page.h>
  14 #include <asm/pgtable.h>
  15
  16 #define QUICK_PGD       0       /* Preserve kernel mappings over free */
  17 #define QUICK_PT        1       /* Zero on free */
  18
  19 static inline void pmd_populate_kernel(struct mm_struct *mm,
  20                                        pmd_t *pmd, pte_t *pte)
  21 {
  22         set_pmd(pmd, __pmd((unsigned long)pte));
  23 }
  24
  25 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  26                                     pgtable_t pte)
  27 {
  28         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  29 }
  30 #define pmd_pgtable(pmd) pmd_page(pmd)
  31
  32 static inline void pgd_ctor(void *x)
  33 {
  34         pgd_t *pgd = x;
  35
  36         memcpy(pgd + USER_PTRS_PER_PGD,
  37                 swapper_pg_dir + USER_PTRS_PER_PGD,
  38                 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  39 }
  40
  41 /*
  42  * Allocate and free page tables
  43  */
  44 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  45 {
  46         return quicklist_alloc(QUICK_PGD, GFP_KERNEL, pgd_ctor);
  47 }
  48
  49 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  50 {
  51         quicklist_free(QUICK_PGD, NULL, pgd);
  52 }
  53
  54 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  55                                           unsigned long address)
  56 {
  57         return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
  58 }
  59
  60 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  61                                          unsigned long address)
  62 {
  63         struct page *page;
  64         void *pg;
  65
  66         pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
  67         if (!pg)
  68                 return NULL;
  69
  70         page = virt_to_page(pg);
  71         if (!pgtable_page_ctor(page)) {
  72                 quicklist_free(QUICK_PT, NULL, pg);
  73                 return NULL;
  74         }
  75
  76         return page;
  77 }
  78
  79 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  80 {
  81         quicklist_free(QUICK_PT, NULL, pte);
  82 }
  83
  84 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  85 {
  86         pgtable_page_dtor(pte);
  87         quicklist_free_page(QUICK_PT, NULL, pte);
  88 }
  89
  90 #define __pte_free_tlb(tlb,pte,addr)                    \
  91 do {                                                    \
  92         pgtable_page_dtor(pte);                         \
  93         tlb_remove_page((tlb), pte);                    \
  94 } while (0)
  95
  96 static inline void check_pgt_cache(void)
  97 {
  98         quicklist_trim(QUICK_PGD, NULL, 25, 16);
  99         quicklist_trim(QUICK_PT, NULL, 25, 16);
 100 }
 101
 102 #endif /* __ASM_AVR32_PGALLOC_H */