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            need_flush;
  14         unsigned int            fullmm;
  15 };
  16
  17 DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
  18
  19 static inline struct mmu_gather *
  20 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
  21 {
  22         struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
  23
  24         tlb->mm = mm;
  25         tlb->need_flush = 0;
  26         tlb->fullmm = full_mm_flush;
  27
  28         return tlb;
  29 }
  30
  31 static inline void
  32 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  33 {
  34         if (tlb->need_flush)
  35                 flush_tlb_mm(tlb->mm);
  36
  37         /* keep the page table cache within bounds */
  38         check_pgt_cache();
  39
  40         put_cpu_var(mmu_gathers);
  41 }
  42
  43 #define tlb_remove_tlb_entry(tlb,ptep,address)  do { } while (0)
  44 //#define tlb_start_vma(tlb,vma)                  do { } while (0)
  45 //FIXME - ARM32 uses this now that things changed in the kernel. seems like it may be pointless on arm26, however to get things compiling...
  46 #define tlb_start_vma(tlb,vma)                                          \
  47         do {                                                            \
  48                 if (!tlb->fullmm)                                       \
  49                         flush_cache_range(vma, vma->vm_start, vma->vm_end); \
  50         } while (0)
  51 #define tlb_end_vma(tlb,vma)                    do { } while (0)
  52
  53 static inline void
  54 tlb_remove_page(struct mmu_gather *tlb, struct page *page)
  55 {
  56         tlb->need_flush = 1;
  57         free_page_and_swap_cache(page);
  58 }
  59
  60 #define pte_free_tlb(tlb,ptep)          pte_free(ptep)
  61 #define pmd_free_tlb(tlb,pmdp)          pmd_free(pmdp)
  62
  63 #endif