release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/include/asm/tlb.h

   1 #ifndef __ASM_SH_TLB_H
   2 #define __ASM_SH_TLB_H
   3
   4 #ifdef CONFIG_SUPERH64
   5 # include "tlb_64.h"
   6 #endif
   7
   8 #ifndef __ASSEMBLY__
   9 #include <linux/pagemap.h>
  10
  11 #ifdef CONFIG_MMU
  12 #include <asm/pgalloc.h>
  13 #include <asm/tlbflush.h>
  14 #include <asm/mmu_context.h>
  15
  16 /*
  17  * TLB handling.  This allows us to remove pages from the page
  18  * tables, and efficiently handle the TLB issues.
  19  */
  20 struct mmu_gather {
  21         struct mm_struct        *mm;
  22         unsigned int            fullmm;
  23         unsigned long           start, end;
  24 };
  25
  26 DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
  27
  28 static inline void init_tlb_gather(struct mmu_gather *tlb)
  29 {
  30         tlb->start = TASK_SIZE;
  31         tlb->end = 0;
  32
  33         if (tlb->fullmm) {
  34                 tlb->start = 0;
  35                 tlb->end = TASK_SIZE;
  36         }
  37 }
  38
  39 static inline struct mmu_gather *
  40 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
  41 {
  42         struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
  43
  44         tlb->mm = mm;
  45         tlb->fullmm = full_mm_flush;
  46
  47         init_tlb_gather(tlb);
  48
  49         return tlb;
  50 }
  51
  52 static inline void
  53 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  54 {
  55         if (tlb->fullmm)
  56                 flush_tlb_mm(tlb->mm);
  57
  58         /* keep the page table cache within bounds */
  59         check_pgt_cache();
  60
  61         put_cpu_var(mmu_gathers);
  62 }
  63
  64 static inline void
  65 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
  66 {
  67         if (tlb->start > address)
  68                 tlb->start = address;
  69         if (tlb->end < address + PAGE_SIZE)
  70                 tlb->end = address + PAGE_SIZE;
  71 }
  72
  73 /*
  74  * In the case of tlb vma handling, we can optimise these away in the
  75  * case where we're doing a full MM flush.  When we're doing a munmap,
  76  * the vmas are adjusted to only cover the region to be torn down.
  77  */
  78 static inline void
  79 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  80 {
  81         if (!tlb->fullmm)
  82                 flush_cache_range(vma, vma->vm_start, vma->vm_end);
  83 }
  84
  85 static inline void
  86 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  87 {
  88         if (!tlb->fullmm && tlb->end) {
  89                 flush_tlb_range(vma, tlb->start, tlb->end);
  90                 init_tlb_gather(tlb);
  91         }
  92 }
  93
  94 #define tlb_remove_page(tlb,page)       free_page_and_swap_cache(page)
  95 #define pte_free_tlb(tlb, ptep, addr)   pte_free((tlb)->mm, ptep)
  96 #define pmd_free_tlb(tlb, pmdp, addr)   pmd_free((tlb)->mm, pmdp)
  97 #define pud_free_tlb(tlb, pudp, addr)   pud_free((tlb)->mm, pudp)
  98
  99 #define tlb_migrate_finish(mm)          do { } while (0)
 100
 101 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
 102 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
 103 extern void tlb_unwire_entry(void);
 104 #else
 105 static inline void tlb_wire_entry(struct vm_area_struct *vma ,
 106                                   unsigned long addr, pte_t pte)
 107 {
 108         BUG();
 109 }
 110
 111 static inline void tlb_unwire_entry(void)
 112 {
 113         BUG();
 114 }
 115 #endif
 116
 117 #else /* CONFIG_MMU */
 118
 119 #define tlb_start_vma(tlb, vma)                         do { } while (0)
 120 #define tlb_end_vma(tlb, vma)                           do { } while (0)
 121 #define __tlb_remove_tlb_entry(tlb, pte, address)       do { } while (0)
 122 #define tlb_flush(tlb)                                  do { } while (0)
 123
 124 #include <asm-generic/tlb.h>
 125
 126 #endif /* CONFIG_MMU */
 127 #endif /* __ASSEMBLY__ */
 128 #endif /* __ASM_SH_TLB_H */