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 <asm/tlb_64.h>
   6 #endif
   7
   8 #ifndef __ASSEMBLY__
   9 #include <linux/pagemap.h>
  10
  11 #ifdef CONFIG_MMU
  12 #include <linux/swap.h>
  13 #include <asm/pgalloc.h>
  14 #include <asm/tlbflush.h>
  15 #include <asm/mmu_context.h>
  16
  17 /*
  18  * TLB handling.  This allows us to remove pages from the page
  19  * tables, and efficiently handle the TLB issues.
  20  */
  21 struct mmu_gather {
  22         struct mm_struct        *mm;
  23         unsigned int            fullmm;
  24         unsigned long           start, end;
  25 };
  26
  27 static inline void init_tlb_gather(struct mmu_gather *tlb)
  28 {
  29         tlb->start = TASK_SIZE;
  30         tlb->end = 0;
  31
  32         if (tlb->fullmm) {
  33                 tlb->start = 0;
  34                 tlb->end = TASK_SIZE;
  35         }
  36 }
  37
  38 static inline void
  39 tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned int full_mm_flush)
  40 {
  41         tlb->mm = mm;
  42         tlb->fullmm = full_mm_flush;
  43
  44         init_tlb_gather(tlb);
  45 }
  46
  47 static inline void
  48 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  49 {
  50         if (tlb->fullmm)
  51                 flush_tlb_mm(tlb->mm);
  52
  53         /* keep the page table cache within bounds */
  54         check_pgt_cache();
  55 }
  56
  57 static inline void
  58 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
  59 {
  60         if (tlb->start > address)
  61                 tlb->start = address;
  62         if (tlb->end < address + PAGE_SIZE)
  63                 tlb->end = address + PAGE_SIZE;
  64 }
  65
  66 /*
  67  * In the case of tlb vma handling, we can optimise these away in the
  68  * case where we're doing a full MM flush.  When we're doing a munmap,
  69  * the vmas are adjusted to only cover the region to be torn down.
  70  */
  71 static inline void
  72 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  73 {
  74         if (!tlb->fullmm)
  75                 flush_cache_range(vma, vma->vm_start, vma->vm_end);
  76 }
  77
  78 static inline void
  79 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  80 {
  81         if (!tlb->fullmm && tlb->end) {
  82                 flush_tlb_range(vma, tlb->start, tlb->end);
  83                 init_tlb_gather(tlb);
  84         }
  85 }
  86
  87 static inline void tlb_flush_mmu(struct mmu_gather *tlb)
  88 {
  89 }
  90
  91 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
  92 {
  93         free_page_and_swap_cache(page);
  94         return 1; /* avoid calling tlb_flush_mmu */
  95 }
  96
  97 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
  98 {
  99         __tlb_remove_page(tlb, page);
 100 }
 101
 102 #define pte_free_tlb(tlb, ptep, addr)   pte_free((tlb)->mm, ptep)
 103 #define pmd_free_tlb(tlb, pmdp, addr)   pmd_free((tlb)->mm, pmdp)
 104 #define pud_free_tlb(tlb, pudp, addr)   pud_free((tlb)->mm, pudp)
 105
 106 #define tlb_migrate_finish(mm)          do { } while (0)
 107
 108 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
 109 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
 110 extern void tlb_unwire_entry(void);
 111 #else
 112 static inline void tlb_wire_entry(struct vm_area_struct *vma ,
 113                                   unsigned long addr, pte_t pte)
 114 {
 115         BUG();
 116 }
 117
 118 static inline void tlb_unwire_entry(void)
 119 {
 120         BUG();
 121 }
 122 #endif
 123
 124 #else /* CONFIG_MMU */
 125
 126 #define tlb_start_vma(tlb, vma)                         do { } while (0)
 127 #define tlb_end_vma(tlb, vma)                           do { } while (0)
 128 #define __tlb_remove_tlb_entry(tlb, pte, address)       do { } while (0)
 129 #define tlb_flush(tlb)                                  do { } while (0)
 130
 131 #include <asm-generic/tlb.h>
 132
 133 #endif /* CONFIG_MMU */
 134 #endif /* __ASSEMBLY__ */
 135 #endif /* __ASM_SH_TLB_H */