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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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(struct mmu_gather *tlb)
90{
91}
92
93static 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
99static 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)
111extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
112extern void tlb_unwire_entry(void);
113#else
114static inline void tlb_wire_entry(struct vm_area_struct *vma ,
115 unsigned long addr, pte_t pte)
116{
117 BUG();
118}
119
120static 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 */