Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | extern struct mmu_gather mmu_gathers[NR_CPUS]; |
| 21 | |
| 22 | static inline struct mmu_gather * |
| 23 | tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) |
| 24 | { |
| 25 | int cpu = smp_processor_id(); |
| 26 | struct mmu_gather *tlb = &mmu_gathers[cpu]; |
| 27 | |
| 28 | tlb->mm = mm; |
| 29 | tlb->freed = 0; |
| 30 | tlb->fullmm = full_mm_flush; |
| 31 | |
| 32 | return tlb; |
| 33 | } |
| 34 | |
| 35 | static inline void |
| 36 | tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) |
| 37 | { |
| 38 | struct mm_struct *mm = tlb->mm; |
| 39 | unsigned long freed = tlb->freed; |
| 40 | int rss = get_mm_counter(mm, rss); |
| 41 | |
| 42 | if (rss < freed) |
| 43 | freed = rss; |
| 44 | add_mm_counter(mm, rss, -freed); |
| 45 | |
| 46 | if (freed) { |
| 47 | flush_tlb_mm(mm); |
| 48 | tlb->flushes++; |
| 49 | } else { |
| 50 | tlb->avoided_flushes++; |
| 51 | } |
| 52 | |
| 53 | /* keep the page table cache within bounds */ |
| 54 | check_pgt_cache(); |
| 55 | } |
| 56 | |
| 57 | |
| 58 | static inline unsigned int |
| 59 | tlb_is_full_mm(struct mmu_gather *tlb) |
| 60 | { |
| 61 | return tlb->fullmm; |
| 62 | } |
| 63 | |
| 64 | #define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0) |
| 65 | //#define tlb_start_vma(tlb,vma) do { } while (0) |
| 66 | //FIXME - ARM32 uses this now that things changed in the kernel. seems like it may be pointless on arm26, however to get things compiling... |
| 67 | #define tlb_start_vma(tlb,vma) \ |
| 68 | do { \ |
| 69 | if (!tlb->fullmm) \ |
| 70 | flush_cache_range(vma, vma->vm_start, vma->vm_end); \ |
| 71 | } while (0) |
| 72 | #define tlb_end_vma(tlb,vma) do { } while (0) |
| 73 | |
| 74 | #define tlb_remove_page(tlb,page) free_page_and_swap_cache(page) |
| 75 | #define pte_free_tlb(tlb,ptep) pte_free(ptep) |
| 76 | #define pmd_free_tlb(tlb,pmdp) pmd_free(pmdp) |
| 77 | |
| 78 | #endif |