LXR linux/arch/powerpc/include/asm/book3s/32/pgalloc.h

   1#ifndef _ASM_POWERPC_BOOK3S_32_PGALLOC_H
   2#define _ASM_POWERPC_BOOK3S_32_PGALLOC_H
   3
   4#include <linux/threads.h>
   5
   6/* For 32-bit, all levels of page tables are just drawn from get_free_page() */
   7#define MAX_PGTABLE_INDEX_SIZE  0
   8
   9extern void __bad_pte(pmd_t *pmd);
  10
  11extern pgd_t *pgd_alloc(struct mm_struct *mm);
  12extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  13
  14/*
  15 * We don't have any real pmd's, and this code never triggers because
  16 * the pgd will always be present..
  17 */
  18/* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
  19#define pmd_free(mm, x)                 do { } while (0)
  20#define __pmd_free_tlb(tlb,x,a)         do { } while (0)
  21/* #define pgd_populate(mm, pmd, pte)      BUG() */
  22
  23#ifndef CONFIG_BOOKE
  24
  25static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
  26                                       pte_t *pte)
  27{
  28        *pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
  29}
  30
  31static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
  32                                pgtable_t pte_page)
  33{
  34        *pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_PRESENT);
  35}
  36
  37#define pmd_pgtable(pmd) pmd_page(pmd)
  38#else
  39
  40static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
  41                                       pte_t *pte)
  42{
  43        *pmdp = __pmd((unsigned long)pte | _PMD_PRESENT);
  44}
  45
  46static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
  47                                pgtable_t pte_page)
  48{
  49        *pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT);
  50}
  51
  52#define pmd_pgtable(pmd) pmd_page(pmd)
  53#endif
  54
  55extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
  56extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
  57
  58static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  59{
  60        free_page((unsigned long)pte);
  61}
  62
  63static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
  64{
  65        pgtable_page_dtor(ptepage);
  66        __free_page(ptepage);
  67}
  68
  69static inline void pgtable_free(void *table, unsigned index_size)
  70{
  71        BUG_ON(index_size); /* 32-bit doesn't use this */
  72        free_page((unsigned long)table);
  73}
  74
  75#define check_pgt_cache()       do { } while (0)
  76
  77#ifdef CONFIG_SMP
  78static inline void pgtable_free_tlb(struct mmu_gather *tlb,
  79                                    void *table, int shift)
  80{
  81        unsigned long pgf = (unsigned long)table;
  82        BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
  83        pgf |= shift;
  84        tlb_remove_table(tlb, (void *)pgf);
  85}
  86
  87static inline void __tlb_remove_table(void *_table)
  88{
  89        void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
  90        unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
  91
  92        pgtable_free(table, shift);
  93}
  94#else
  95static inline void pgtable_free_tlb(struct mmu_gather *tlb,
  96                                    void *table, int shift)
  97{
  98        pgtable_free(table, shift);
  99}
 100#endif
 101
 102static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 103                                  unsigned long address)
 104{
 105        pgtable_page_dtor(table);
 106        pgtable_free_tlb(tlb, page_address(table), 0);
 107}
 108#endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */
 109