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 long start, unsigned long end)
  40 {
  41         tlb->mm = mm;
  42         tlb->start = start;
  43         tlb->end = end;
  44         tlb->fullmm = !(start | (end+1));
  45
  46         init_tlb_gather(tlb);
  47 }
  48
  49 static inline void
  50 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  51 {
  52         if (tlb->fullmm)
  53                 flush_tlb_mm(tlb->mm);
  54
  55         /* keep the page table cache within bounds */
  56         check_pgt_cache();
  57 }
  58
  59 static inline void
  60 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
  61 {
  62         if (tlb->start > address)
  63                 tlb->start = address;
  64         if (tlb->end < address + PAGE_SIZE)
  65                 tlb->end = address + PAGE_SIZE;
  66 }
  67
  68 /*
  69  * In the case of tlb vma handling, we can optimise these away in the
  70  * case where we're doing a full MM flush.  When we're doing a munmap,
  71  * the vmas are adjusted to only cover the region to be torn down.
  72  */
  73 static inline void
  74 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  75 {
  76         if (!tlb->fullmm)
  77                 flush_cache_range(vma, vma->vm_start, vma->vm_end);
  78 }
  79
  80 static inline void
  81 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  82 {
  83         if (!tlb->fullmm && tlb->end) {
  84                 flush_tlb_range(vma, tlb->start, tlb->end);
  85                 init_tlb_gather(tlb);
  86         }
  87 }
  88
  89 static inline void tlb_flush_mmu(struct mmu_gather *tlb)
  90 {
  91 }
  92
  93 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
  94 {
  95         free_page_and_swap_cache(page);
  96         return 1; /* avoid calling tlb_flush_mmu */
  97 }
  98
  99 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
 100 {
 101         __tlb_remove_page(tlb, page);
 102 }
 103
 104 #define pte_free_tlb(tlb, ptep, addr)   pte_free((tlb)->mm, ptep)
 105 #define pmd_free_tlb(tlb, pmdp, addr)   pmd_free((tlb)->mm, pmdp)
 106 #define pud_free_tlb(tlb, pudp, addr)   pud_free((tlb)->mm, pudp)
 107
 108 #define tlb_migrate_finish(mm)          do { } while (0)
 109
 110 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
 111 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
 112 extern void tlb_unwire_entry(void);
 113 #else
 114 static inline void tlb_wire_entry(struct vm_area_struct *vma ,
 115                                   unsigned long addr, pte_t pte)
 116 {
 117         BUG();
 118 }
 119
 120 static inline void tlb_unwire_entry(void)
 121 {
 122         BUG();
 123 }
 124 #endif
 125
 126 #else /* CONFIG_MMU */
 127
 128 #define tlb_start_vma(tlb, vma)                         do { } while (0)
 129 #define tlb_end_vma(tlb, vma)                           do { } while (0)
 130 #define __tlb_remove_tlb_entry(tlb, pte, address)       do { } while (0)
 131 #define tlb_flush(tlb)                                  do { } while (0)
 132
 133 #include <asm-generic/tlb.h>
 134
 135 #endif /* CONFIG_MMU */
 136 #endif /* __ASSEMBLY__ */
 137 #endif /* __ASM_SH_TLB_H */