LXR linux/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
  19static 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
  25static 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
  32static 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 */
  44static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  45{
  46        return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
  47}
  48
  49static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  50{
  51        quicklist_free(QUICK_PGD, NULL, pgd);
  52}
  53
  54static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  55                                          unsigned long address)
  56{
  57        return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  58}
  59
  60static 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 | __GFP_REPEAT, 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
  79static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  80{
  81        quicklist_free(QUICK_PT, NULL, pte);
  82}
  83
  84static 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)                    \
  91do {                                                    \
  92        pgtable_page_dtor(pte);                         \
  93        tlb_remove_page((tlb), pte);                    \
  94} while (0)
  95
  96static 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 */
 103