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 arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, 40 unsigned long start, unsigned long end) 41 { 42 tlb->mm = mm; 43 tlb->start = start; 44 tlb->end = end; 45 tlb->fullmm = !(start | (end+1)); 46 47 init_tlb_gather(tlb); 48 } 49 50 static inline void 51 arch_tlb_finish_mmu(struct mmu_gather *tlb, 52 unsigned long start, unsigned long end, bool force) 53 { 54 if (tlb->fullmm || force) 55 flush_tlb_mm(tlb->mm); 56 57 /* keep the page table cache within bounds */ 58 check_pgt_cache(); 59 } 60 61 static inline void 62 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) 63 { 64 if (tlb->start > address) 65 tlb->start = address; 66 if (tlb->end < address + PAGE_SIZE) 67 tlb->end = address + PAGE_SIZE; 68 } 69 70 #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ 71 tlb_remove_tlb_entry(tlb, ptep, address) 72 73 /* 74 * In the case of tlb vma handling, we can optimise these away in the 75 * case where we're doing a full MM flush. When we're doing a munmap, 76 * the vmas are adjusted to only cover the region to be torn down. 77 */ 78 static inline void 79 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 80 { 81 if (!tlb->fullmm) 82 flush_cache_range(vma, vma->vm_start, vma->vm_end); 83 } 84 85 static inline void 86 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 87 { 88 if (!tlb->fullmm && tlb->end) { 89 flush_tlb_range(vma, tlb->start, tlb->end); 90 init_tlb_gather(tlb); 91 } 92 } 93 94 static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) 95 { 96 } 97 98 static inline void tlb_flush_mmu_free(struct mmu_gather *tlb) 99 { 100 } 101 102 static inline void tlb_flush_mmu(struct mmu_gather *tlb) 103 { 104 } 105 106 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) 107 { 108 free_page_and_swap_cache(page); 109 return false; /* avoid calling tlb_flush_mmu */ 110 } 111 112 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 113 { 114 __tlb_remove_page(tlb, page); 115 } 116 117 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb, 118 struct page *page, int page_size) 119 { 120 return __tlb_remove_page(tlb, page); 121 } 122 123 static inline void tlb_remove_page_size(struct mmu_gather *tlb, 124 struct page *page, int page_size) 125 { 126 return tlb_remove_page(tlb, page); 127 } 128 129 #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change 130 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, 131 unsigned int page_size) 132 { 133 } 134 135 #define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep) 136 #define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp) 137 #define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp) 138 139 #define tlb_migrate_finish(mm) do { } while (0) 140 141 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64) 142 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t); 143 extern void tlb_unwire_entry(void); 144 #else 145 static inline void tlb_wire_entry(struct vm_area_struct *vma , 146 unsigned long addr, pte_t pte) 147 { 148 BUG(); 149 } 150 151 static inline void tlb_unwire_entry(void) 152 { 153 BUG(); 154 } 155 #endif 156 157 #else /* CONFIG_MMU */ 158 159 #define tlb_start_vma(tlb, vma) do { } while (0) 160 #define tlb_end_vma(tlb, vma) do { } while (0) 161 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) 162 #define tlb_flush(tlb) do { } while (0) 163 164 #include <asm-generic/tlb.h> 165 166 #endif /* CONFIG_MMU */ 167 #endif /* __ASSEMBLY__ */ 168 #endif /* __ASM_SH_TLB_H */ 169