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 */ 21struct mmu_gather { 22 struct mm_struct *mm; 23 unsigned int fullmm; 24 unsigned long start, end; 25}; 26 27static 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 38static inline void 39tlb_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 49static inline void 50tlb_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 59static inline void 60tlb_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 */ 73static inline void 74tlb_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 80static inline void 81tlb_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 89static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) 90{ 91} 92 93static inline void tlb_flush_mmu_free(struct mmu_gather *tlb) 94{ 95} 96 97static inline void tlb_flush_mmu(struct mmu_gather *tlb) 98{ 99} 100 101static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) 102{ 103 free_page_and_swap_cache(page); 104 return 1; /* avoid calling tlb_flush_mmu */ 105} 106 107static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) 108{ 109 __tlb_remove_page(tlb, page); 110} 111 112#define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep) 113#define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp) 114#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp) 115 116#define tlb_migrate_finish(mm) do { } while (0) 117 118#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64) 119extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t); 120extern void tlb_unwire_entry(void); 121#else 122static inline void tlb_wire_entry(struct vm_area_struct *vma , 123 unsigned long addr, pte_t pte) 124{ 125 BUG(); 126} 127 128static inline void tlb_unwire_entry(void) 129{ 130 BUG(); 131} 132#endif 133 134#else /* CONFIG_MMU */ 135 136#define tlb_start_vma(tlb, vma) do { } while (0) 137#define tlb_end_vma(tlb, vma) do { } while (0) 138#define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) 139#define tlb_flush(tlb) do { } while (0) 140 141#include <asm-generic/tlb.h> 142 143#endif /* CONFIG_MMU */ 144#endif /* __ASSEMBLY__ */ 145#endif /* __ASM_SH_TLB_H */ 146