arch/powerpc/include/asm/pgalloc.h

   1 #ifndef _ASM_POWERPC_PGALLOC_H
   2 #define _ASM_POWERPC_PGALLOC_H
   3 #ifdef __KERNEL__
   4
   5 #include <linux/mm.h>
   6
   7 #ifdef CONFIG_PPC_BOOK3E
   8 extern void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address);
   9 #else /* CONFIG_PPC_BOOK3E */
  10 static inline void tlb_flush_pgtable(struct mmu_gather *tlb,
  11                                      unsigned long address)
  12 {
  13 }
  14 #endif /* !CONFIG_PPC_BOOK3E */
  15
  16 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  17 {
  18         free_page((unsigned long)pte);
  19 }
  20
  21 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
  22 {
  23         pgtable_page_dtor(ptepage);
  24         __free_page(ptepage);
  25 }
  26
  27 typedef struct pgtable_free {
  28         unsigned long val;
  29 } pgtable_free_t;
  30
  31 /* This needs to be big enough to allow for MMU_PAGE_COUNT + 2 to be stored
  32  * and small enough to fit in the low bits of any naturally aligned page
  33  * table cache entry. Arbitrarily set to 0x1f, that should give us some
  34  * room to grow
  35  */
  36 #define PGF_CACHENUM_MASK       0x1f
  37
  38 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
  39                                                 unsigned long mask)
  40 {
  41         BUG_ON(cachenum > PGF_CACHENUM_MASK);
  42
  43         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
  44 }
  45
  46 #ifdef CONFIG_PPC64
  47 #include <asm/pgalloc-64.h>
  48 #else
  49 #include <asm/pgalloc-32.h>
  50 #endif
  51
  52 #ifdef CONFIG_SMP
  53 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
  54 extern void pte_free_finish(void);
  55 #else /* CONFIG_SMP */
  56 static inline void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf)
  57 {
  58         pgtable_free(pgf);
  59 }
  60 static inline void pte_free_finish(void) { }
  61 #endif /* !CONFIG_SMP */
  62
  63 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *ptepage,
  64                                   unsigned long address)
  65 {
  66         pgtable_free_t pgf = pgtable_free_cache(page_address(ptepage),
  67                                                 PTE_NONCACHE_NUM,
  68                                                 PTE_TABLE_SIZE-1);
  69         tlb_flush_pgtable(tlb, address);
  70         pgtable_page_dtor(ptepage);
  71         pgtable_free_tlb(tlb, pgf);
  72 }
  73
  74 #endif /* __KERNEL__ */
  75 #endif /* _ASM_POWERPC_PGALLOC_H */