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 #include <asm/mmu_context.h> 15 16 /* 17 * TLB handling. This allows us to remove pages from the page 18 * tables, and efficiently handle the TLB issues. 19 */ 20 struct mmu_gather { 21 struct mm_struct *mm; 22 unsigned int fullmm; 23 unsigned long start, end; 24 }; 25 26 DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); 27 28 static inline void init_tlb_gather(struct mmu_gather *tlb) 29 { 30 tlb->start = TASK_SIZE; 31 tlb->end = 0; 32 33 if (tlb->fullmm) { 34 tlb->start = 0; 35 tlb->end = TASK_SIZE; 36 } 37 } 38 39 static inline struct mmu_gather * 40 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) 41 { 42 struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); 43 44 tlb->mm = mm; 45 tlb->fullmm = full_mm_flush; 46 47 init_tlb_gather(tlb); 48 49 return tlb; 50 } 51 52 static inline void 53 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) 54 { 55 if (tlb->fullmm) 56 flush_tlb_mm(tlb->mm); 57 58 /* keep the page table cache within bounds */ 59 check_pgt_cache(); 60 61 put_cpu_var(mmu_gathers); 62 } 63 64 static inline void 65 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) 66 { 67 if (tlb->start > address) 68 tlb->start = address; 69 if (tlb->end < address + PAGE_SIZE) 70 tlb->end = address + PAGE_SIZE; 71 } 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 #define tlb_remove_page(tlb,page) free_page_and_swap_cache(page) 95 #define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep) 96 #define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp) 97 #define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp) 98 99 #define tlb_migrate_finish(mm) do { } while (0) 100 101 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64) 102 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t); 103 extern void tlb_unwire_entry(void); 104 #else 105 static inline void tlb_wire_entry(struct vm_area_struct *vma , 106 unsigned long addr, pte_t pte) 107 { 108 BUG(); 109 } 110 111 static inline void tlb_unwire_entry(void) 112 { 113 BUG(); 114 } 115 #endif 116 117 #else /* CONFIG_MMU */ 118 119 #define tlb_start_vma(tlb, vma) do { } while (0) 120 #define tlb_end_vma(tlb, vma) do { } while (0) 121 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) 122 #define tlb_flush(tlb) do { } while (0) 123 124 #include <asm-generic/tlb.h> 125 126 #endif /* CONFIG_MMU */ 127 #endif /* __ASSEMBLY__ */ 128 #endif /* __ASM_SH_TLB_H */ 129