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
   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
  25 static 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
  31 static 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
  40 static 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
  46 static 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
  55 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
  56 extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
  57
  58 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  59 {
  60         free_page((unsigned long)pte);
  61 }
  62
  63 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
  64 {
  65         pgtable_page_dtor(ptepage);
  66         __free_page(ptepage);
  67 }
  68
  69 static 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
  78 static 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
  87 static 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
  95 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
  96                                     void *table, int shift)
  97 {
  98         pgtable_free(table, shift);
  99 }
 100 #endif
 101
 102 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 103                                   unsigned long address)
 104 {
 105         tlb_flush_pgtable(tlb, address);
 106         pgtable_page_dtor(table);
 107         pgtable_free_tlb(tlb, page_address(table), 0);
 108 }
 109 #endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */