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