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