linux/arch/avr32/include/asm/pgalloc.h
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   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
  18static 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
  24static 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
  31static 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 */
  43static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  44{
  45        return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
  46}
  47
  48static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  49{
  50        quicklist_free(QUICK_PGD, NULL, pgd);
  51}
  52
  53static 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
  59static 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
  75static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  76{
  77        quicklist_free(QUICK_PT, NULL, pte);
  78}
  79
  80static 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)                         \
  87do {                                                    \
  88        pgtable_page_dtor(pte);                         \
  89        tlb_remove_page((tlb), pte);                    \
  90} while (0)
  91
  92static 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 */
  99