9 #include <linux/pagemap.h>
12 #include <asm/pgalloc.h>
13 #include <asm/tlbflush.h>
14 #include <asm/mmu_context.h>
17 * TLB handling. This allows us to remove pages from the page
18 * tables, and efficiently handle the TLB issues.
23 unsigned long start, end;
26 static inline void init_tlb_gather(struct mmu_gather *tlb)
28 tlb->start = TASK_SIZE;
38 tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned int full_mm_flush)
41 tlb->fullmm = full_mm_flush;
47 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
50 flush_tlb_mm(tlb->mm);
52 /* keep the page table cache within bounds */
57 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
59 if (tlb->start > address)
61 if (tlb->end < address + PAGE_SIZE)
62 tlb->end = address + PAGE_SIZE;
66 * In the case of tlb vma handling, we can optimise these away in the
67 * case where we're doing a full MM flush. When we're doing a munmap,
68 * the vmas are adjusted to only cover the region to be torn down.
71 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
74 flush_cache_range(vma, vma->vm_start, vma->vm_end);
78 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
80 if (!tlb->fullmm && tlb->end) {
81 flush_tlb_range(vma, tlb->start, tlb->end);
86 static inline void tlb_flush_mmu(struct mmu_gather *tlb)
90 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
92 free_page_and_swap_cache(page);
93 return 1; /* avoid calling tlb_flush_mmu */
96 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
98 __tlb_remove_page(tlb, page);
101 #define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep)
102 #define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp)
103 #define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)
105 #define tlb_migrate_finish(mm) do { } while (0)
107 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
108 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
109 extern void tlb_unwire_entry(void);
111 static inline void tlb_wire_entry(struct vm_area_struct *vma ,
112 unsigned long addr, pte_t pte)
117 static inline void tlb_unwire_entry(void)
123 #else /* CONFIG_MMU */
125 #define tlb_start_vma(tlb, vma) do { } while (0)
126 #define tlb_end_vma(tlb, vma) do { } while (0)
127 #define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0)
128 #define tlb_flush(tlb) do { } while (0)
130 #include <asm-generic/tlb.h>
132 #endif /* CONFIG_MMU */
133 #endif /* __ASSEMBLY__ */
134 #endif /* __ASM_SH_TLB_H */