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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/tlb.h | |
3 | * | |
4 | * Copyright (C) 2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Experimentation shows that on a StrongARM, it appears to be faster | |
11 | * to use the "invalidate whole tlb" rather than "invalidate single | |
12 | * tlb" for this. | |
13 | * | |
14 | * This appears true for both the process fork+exit case, as well as | |
15 | * the munmap-large-area case. | |
16 | */ | |
17 | #ifndef __ASMARM_TLB_H | |
18 | #define __ASMARM_TLB_H | |
19 | ||
20 | #include <asm/cacheflush.h> | |
21 | #include <asm/tlbflush.h> | |
0157903e HC |
22 | |
23 | #ifndef CONFIG_MMU | |
24 | ||
25 | #include <linux/pagemap.h> | |
26 | #include <asm-generic/tlb.h> | |
27 | ||
28 | #else /* !CONFIG_MMU */ | |
29 | ||
1da177e4 LT |
30 | #include <asm/pgalloc.h> |
31 | ||
32 | /* | |
33 | * TLB handling. This allows us to remove pages from the page | |
34 | * tables, and efficiently handle the TLB issues. | |
35 | */ | |
36 | struct mmu_gather { | |
37 | struct mm_struct *mm; | |
1da177e4 | 38 | unsigned int fullmm; |
1da177e4 LT |
39 | }; |
40 | ||
41 | DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); | |
42 | ||
43 | static inline struct mmu_gather * | |
44 | tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) | |
45 | { | |
15a23ffa | 46 | struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); |
1da177e4 LT |
47 | |
48 | tlb->mm = mm; | |
1da177e4 LT |
49 | tlb->fullmm = full_mm_flush; |
50 | ||
51 | return tlb; | |
52 | } | |
53 | ||
54 | static inline void | |
55 | tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) | |
56 | { | |
1da177e4 | 57 | if (tlb->fullmm) |
fc2acab3 | 58 | flush_tlb_mm(tlb->mm); |
1da177e4 LT |
59 | |
60 | /* keep the page table cache within bounds */ | |
61 | check_pgt_cache(); | |
15a23ffa HD |
62 | |
63 | put_cpu_var(mmu_gathers); | |
1da177e4 LT |
64 | } |
65 | ||
1da177e4 LT |
66 | #define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0) |
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 | */ | |
73 | static inline void | |
74 | tlb_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 | ||
80 | static inline void | |
81 | tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) | |
82 | { | |
83 | if (!tlb->fullmm) | |
84 | flush_tlb_range(vma, vma->vm_start, vma->vm_end); | |
85 | } | |
86 | ||
87 | #define tlb_remove_page(tlb,page) free_page_and_swap_cache(page) | |
5e541973 BH |
88 | #define pte_free_tlb(tlb, ptep) pte_free((tlb)->mm, ptep) |
89 | #define pmd_free_tlb(tlb, pmdp) pmd_free((tlb)->mm, pmdp) | |
1da177e4 LT |
90 | |
91 | #define tlb_migrate_finish(mm) do { } while (0) | |
92 | ||
0157903e | 93 | #endif /* CONFIG_MMU */ |
1da177e4 | 94 | #endif |