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C/C++ Source or Header  |  2006-08-11  |  1.9 KB  |  64 lines
  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
  64.