arch/powerpc/include/asm/pgalloc-32.h

   1 #ifndef _ASM_POWERPC_PGALLOC_32_H
   2 #define _ASM_POWERPC_PGALLOC_32_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
   9 extern void __bad_pte(pmd_t *pmd);
  10
  11 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  12 extern 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 #define pmd_populate_kernel(mm, pmd, pte)       \
  25                 (pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
  26 #define pmd_populate(mm, pmd, pte)      \
  27                 (pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
  28 #define pmd_pgtable(pmd) pmd_page(pmd)
  29 #else
  30 #define pmd_populate_kernel(mm, pmd, pte)       \
  31                 (pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
  32 #define pmd_populate(mm, pmd, pte)      \
  33                 (pmd_val(*(pmd)) = (unsigned long)lowmem_page_address(pte) | _PMD_PRESENT)
  34 #define pmd_pgtable(pmd) pmd_page(pmd)
  35 #endif
  36
  37 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
  38 extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
  39
  40 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  41 {
  42         free_page((unsigned long)pte);
  43 }
  44
  45 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
  46 {
  47         pgtable_page_dtor(ptepage);
  48         __free_page(ptepage);
  49 }
  50
  51 static inline void pgtable_free(void *table, unsigned index_size)
  52 {
  53         BUG_ON(index_size); /* 32-bit doesn't use this */
  54         free_page((unsigned long)table);
  55 }
  56
  57 #define check_pgt_cache()       do { } while (0)
  58
  59 #ifdef CONFIG_SMP
  60 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
  61                                     void *table, int shift)
  62 {
  63         unsigned long pgf = (unsigned long)table;
  64         BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
  65         pgf |= shift;
  66         tlb_remove_table(tlb, (void *)pgf);
  67 }
  68
  69 static inline void __tlb_remove_table(void *_table)
  70 {
  71         void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
  72         unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
  73
  74         pgtable_free(table, shift);
  75 }
  76 #else
  77 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
  78                                     void *table, int shift)
  79 {
  80         pgtable_free(table, shift);
  81 }
  82 #endif
  83
  84 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
  85                                   unsigned long address)
  86 {
  87         tlb_flush_pgtable(tlb, address);
  88         pgtable_page_dtor(table);
  89         pgtable_free_tlb(tlb, page_address(table), 0);
  90 }
  91 #endif /* _ASM_POWERPC_PGALLOC_32_H */