LXR linux/arch/sh/include/asm/pgalloc.h

   1#ifndef __ASM_SH_PGALLOC_H
   2#define __ASM_SH_PGALLOC_H
   3
   4#include <linux/quicklist.h>
   5#include <asm/page.h>
   6
   7#define QUICK_PGD 0     /* We preserve special mappings over free */
   8#define QUICK_PT 1      /* Other page table pages that are zero on free */
   9
  10static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  11                                       pte_t *pte)
  12{
  13        set_pmd(pmd, __pmd((unsigned long)pte));
  14}
  15
  16static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  17                                pgtable_t pte)
  18{
  19        set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  20}
  21#define pmd_pgtable(pmd) pmd_page(pmd)
  22
  23static inline void pgd_ctor(void *x)
  24{
  25        pgd_t *pgd = x;
  26
  27        memcpy(pgd + USER_PTRS_PER_PGD,
  28               swapper_pg_dir + USER_PTRS_PER_PGD,
  29               (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  30}
  31
  32/*
  33 * Allocate and free page tables.
  34 */
  35static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  36{
  37        return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
  38}
  39
  40static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  41{
  42        quicklist_free(QUICK_PGD, NULL, pgd);
  43}
  44
  45static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  46                                          unsigned long address)
  47{
  48        return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  49}
  50
  51static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  52                                        unsigned long address)
  53{
  54        struct page *page;
  55        void *pg;
  56
  57        pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
  58        if (!pg)
  59                return NULL;
  60        page = virt_to_page(pg);
  61        pgtable_page_ctor(page);
  62        return page;
  63}
  64
  65static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  66{
  67        quicklist_free(QUICK_PT, NULL, pte);
  68}
  69
  70static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  71{
  72        pgtable_page_dtor(pte);
  73        quicklist_free_page(QUICK_PT, NULL, pte);
  74}
  75
  76#define __pte_free_tlb(tlb,pte,addr)                    \
  77do {                                                    \
  78        pgtable_page_dtor(pte);                         \
  79        tlb_remove_page((tlb), (pte));                  \
  80} while (0)
  81
  82static inline void check_pgt_cache(void)
  83{
  84        quicklist_trim(QUICK_PGD, NULL, 25, 16);
  85        quicklist_trim(QUICK_PT, NULL, 25, 16);
  86}
  87
  88#endif /* __ASM_SH_PGALLOC_H */
  89