include/asm-arm26/tlb.h

   1 #ifndef __ASMARM_TLB_H
   2 #define __ASMARM_TLB_H
   3
   4 #include <asm/pgalloc.h>
   5 #include <asm/tlbflush.h>
   6
   7 /*
   8  * TLB handling.  This allows us to remove pages from the page
   9  * tables, and efficiently handle the TLB issues.
  10  */
  11 struct mmu_gather {
  12         struct mm_struct        *mm;
  13         unsigned int            freed;
  14         unsigned int            fullmm;
  15
  16         unsigned int            flushes;
  17         unsigned int            avoided_flushes;
  18 };
  19
  20 DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
  21
  22 static inline struct mmu_gather *
  23 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
  24 {
  25         struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
  26
  27         tlb->mm = mm;
  28         tlb->freed = 0;
  29         tlb->fullmm = full_mm_flush;
  30
  31         return tlb;
  32 }
  33
  34 static inline void
  35 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  36 {
  37         struct mm_struct *mm = tlb->mm;
  38         unsigned long freed = tlb->freed;
  39         int rss = get_mm_counter(mm, rss);
  40
  41         if (rss < freed)
  42                 freed = rss;
  43         add_mm_counter(mm, rss, -freed);
  44
  45         if (freed) {
  46                 flush_tlb_mm(mm);
  47                 tlb->flushes++;
  48         } else {
  49                 tlb->avoided_flushes++;
  50         }
  51
  52         /* keep the page table cache within bounds */
  53         check_pgt_cache();
  54
  55         put_cpu_var(mmu_gathers);
  56 }
  57
  58
  59 static inline unsigned int
  60 tlb_is_full_mm(struct mmu_gather *tlb)
  61 {
  62      return tlb->fullmm;
  63 }
  64
  65 #define tlb_remove_tlb_entry(tlb,ptep,address)  do { } while (0)
  66 //#define tlb_start_vma(tlb,vma)                  do { } while (0)
  67 //FIXME - ARM32 uses this now that things changed in the kernel. seems like it may be pointless on arm26, however to get things compiling...
  68 #define tlb_start_vma(tlb,vma)                                          \
  69         do {                                                            \
  70                 if (!tlb->fullmm)                                       \
  71                         flush_cache_range(vma, vma->vm_start, vma->vm_end); \
  72         } while (0)
  73 #define tlb_end_vma(tlb,vma)                    do { } while (0)
  74
  75 #define tlb_remove_page(tlb,page)       free_page_and_swap_cache(page)
  76 #define pte_free_tlb(tlb,ptep)          pte_free(ptep)
  77 #define pmd_free_tlb(tlb,pmdp)          pmd_free(pmdp)
  78
  79 #endif