1 #ifndef __ASM_SH_TLB_H 2 #define __ASM_SH_TLB_H 3 4 #ifdef CONFIG_SUPERH64 5 # include <asm/tlb_64.h> 6 #endif 7 8 #ifndef __ASSEMBLY__ 9 #include <linux/pagemap.h> 10 11 #ifdef CONFIG_MMU 12 #include <linux/swap.h> 13 #include <asm/pgalloc.h> 14 #include <asm/tlbflush.h> 15 #include <asm/mmu_context.h> 16 17 /* 18 * TLB handling. This allows us to remove pages from the page 19 * tables, and efficiently handle the TLB issues. 20 */ 21 struct mmu_gather { 22 struct mm_struct *mm; 23 unsigned int fullmm; 24 unsigned long start, end; 25 }; 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 void 39 tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end) 40 { 41 tlb->mm = mm; 42 tlb->start = start; 43 tlb->end = end; 44 tlb->fullmm = !(start | (end+1)); 45 46 init_tlb_gather(tlb); 47 } 48 49 static inline void 50 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) 51 { 52 if (tlb->fullmm) 53 flush_tlb_mm(tlb->mm); 54 55 /* keep the page table cache within bounds */ 56 check_pgt_cache(); 57 } 58 59 static inline void 60 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) 61 { 62 if (tlb->start > address) 63 tlb->start = address; 64 if (tlb->end < address + PAGE_SIZE) 65 tlb->end = address + PAGE_SIZE; 66 } 67 68 #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ 69 tlb_remove_tlb_entry(tlb, ptep, address) 70 71 /* 72 * In the case of tlb vma handling, we can optimise these away in the 73 * case where we're doing a full MM flush. When we're doing a munmap, 74 * the vmas are adjusted to only cover the region to be torn down. 75 */ 76 static inline void 77 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 78 { 79 if (!tlb->fullmm) 80 flush_cache_range(vma, vma->vm_start, vma->vm_end); 81 } 82 83 static inline void 84 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 85 { 86 if (!tlb->fullmm && tlb->end) { 87 flush_tlb_range(vma, tlb->start, tlb->end); 88 init_tlb_gather(tlb); 89 } 90 } 91 92 static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) 93 { 94 } 95 96 static inline void tlb_flush_mmu_free(struct mmu_gather *tlb) 97 { 98 } 99 100 static inline void tlb_flush_mmu(struct mmu_gather *tlb) 101 { 102 } 103 104 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) 105 { 106 free_page_and_swap_cache(page); 107 return false; /* avoid calling tlb_flush_mmu */ 108 } 109 110 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 111 { 112 __tlb_remove_page(tlb, page); 113 } 114 115 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb, 116 struct page *page, int page_size) 117 { 118 return __tlb_remove_page(tlb, page); 119 } 120 121 static inline void tlb_remove_page_size(struct mmu_gather *tlb, 122 struct page *page, int page_size) 123 { 124 return tlb_remove_page(tlb, page); 125 } 126 127 #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change 128 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, 129 unsigned int page_size) 130 { 131 } 132 133 #define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep) 134 #define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp) 135 #define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp) 136 137 #define tlb_migrate_finish(mm) do { } while (0) 138 139 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64) 140 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t); 141 extern void tlb_unwire_entry(void); 142 #else 143 static inline void tlb_wire_entry(struct vm_area_struct *vma , 144 unsigned long addr, pte_t pte) 145 { 146 BUG(); 147 } 148 149 static inline void tlb_unwire_entry(void) 150 { 151 BUG(); 152 } 153 #endif 154 155 #else /* CONFIG_MMU */ 156 157 #define tlb_start_vma(tlb, vma) do { } while (0) 158 #define tlb_end_vma(tlb, vma) do { } while (0) 159 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) 160 #define tlb_flush(tlb) do { } while (0) 161 162 #include <asm-generic/tlb.h> 163 164 #endif /* CONFIG_MMU */ 165 #endif /* __ASSEMBLY__ */ 166 #endif /* __ASM_SH_TLB_H */ 167