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 #else /* CONFIG_MMU */ 101 102 #define tlb_start_vma(tlb, vma) do { } while (0) 103 #define tlb_end_vma(tlb, vma) do { } while (0) 104 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) 105 #define tlb_flush(tlb) do { } while (0) 106 107 #include <asm-generic/tlb.h> 108 109 #endif /* CONFIG_MMU */ 110 #endif /* __ASSEMBLY__ */ 111 #endif /* __ASM_SH_TLB_H */ 112