arch/powerpc/include/asm/tlb.h

   1 /*
   2  *      TLB shootdown specifics for powerpc
   3  *
   4  * Copyright (C) 2002 Anton Blanchard, IBM Corp.
   5  * Copyright (C) 2002 Paul Mackerras, IBM Corp.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12 #ifndef _ASM_POWERPC_TLB_H
  13 #define _ASM_POWERPC_TLB_H
  14 #ifdef __KERNEL__
  15
  16 #ifndef __powerpc64__
  17 #include <asm/pgtable.h>
  18 #endif
  19 #include <asm/pgalloc.h>
  20 #include <asm/tlbflush.h>
  21 #ifndef __powerpc64__
  22 #include <asm/page.h>
  23 #include <asm/mmu.h>
  24 #endif
  25
  26 #include <linux/pagemap.h>
  27
  28 struct mmu_gather;
  29
  30 #define tlb_start_vma(tlb, vma) do { } while (0)
  31 #define tlb_end_vma(tlb, vma)   do { } while (0)
  32
  33 #if !defined(CONFIG_PPC_STD_MMU)
  34
  35 #define tlb_flush(tlb)                  flush_tlb_mm((tlb)->mm)
  36
  37 #elif defined(__powerpc64__)
  38
  39 extern void pte_free_finish(void);
  40
  41 static inline void tlb_flush(struct mmu_gather *tlb)
  42 {
  43         struct ppc64_tlb_batch *tlbbatch = &__get_cpu_var(ppc64_tlb_batch);
  44
  45         /* If there's a TLB batch pending, then we must flush it because the
  46          * pages are going to be freed and we really don't want to have a CPU
  47          * access a freed page because it has a stale TLB
  48          */
  49         if (tlbbatch->index)
  50                 __flush_tlb_pending(tlbbatch);
  51
  52         pte_free_finish();
  53 }
  54
  55 #else
  56
  57 extern void tlb_flush(struct mmu_gather *tlb);
  58
  59 #endif
  60
  61 /* Get the generic bits... */
  62 #include <asm-generic/tlb.h>
  63
  64 #if !defined(CONFIG_PPC_STD_MMU) || defined(__powerpc64__)
  65
  66 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0)
  67
  68 #else
  69 extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep,
  70                              unsigned long address);
  71
  72 static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
  73                                         unsigned long address)
  74 {
  75         if (pte_val(*ptep) & _PAGE_HASHPTE)
  76                 flush_hash_entry(tlb->mm, ptep, address);
  77 }
  78
  79 #endif
  80 #endif /* __KERNEL__ */
  81 #endif /* __ASM_POWERPC_TLB_H */