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 /* 69 * In the case of tlb vma handling, we can optimise these away in the 70 * case where we're doing a full MM flush. When we're doing a munmap, 71 * the vmas are adjusted to only cover the region to be torn down. 72 */ 73 static inline void 74 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 75 { 76 if (!tlb->fullmm) 77 flush_cache_range(vma, vma->vm_start, vma->vm_end); 78 } 79 80 static inline void 81 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) 82 { 83 if (!tlb->fullmm && tlb->end) { 84 flush_tlb_range(vma, tlb->start, tlb->end); 85 init_tlb_gather(tlb); 86 } 87 } 88 89 static inline void tlb_flush_mmu(struct mmu_gather *tlb) 90 { 91 } 92 93 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) 94 { 95 free_page_and_swap_cache(page); 96 return 1; /* avoid calling tlb_flush_mmu */ 97 } 98 99 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 100 { 101 __tlb_remove_page(tlb, page); 102 } 103 104 #define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep) 105 #define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp) 106 #define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp) 107 108 #define tlb_migrate_finish(mm) do { } while (0) 109 110 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64) 111 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t); 112 extern void tlb_unwire_entry(void); 113 #else 114 static inline void tlb_wire_entry(struct vm_area_struct *vma , 115 unsigned long addr, pte_t pte) 116 { 117 BUG(); 118 } 119 120 static inline void tlb_unwire_entry(void) 121 { 122 BUG(); 123 } 124 #endif 125 126 #else /* CONFIG_MMU */ 127 128 #define tlb_start_vma(tlb, vma) do { } while (0) 129 #define tlb_end_vma(tlb, vma) do { } while (0) 130 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) 131 #define tlb_flush(tlb) do { } while (0) 132 133 #include <asm-generic/tlb.h> 134 135 #endif /* CONFIG_MMU */ 136 #endif /* __ASSEMBLY__ */ 137 #endif /* __ASM_SH_TLB_H */ 138