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1da177e4 LT |
1 | #ifndef _PARISC_TLBFLUSH_H |
2 | #define _PARISC_TLBFLUSH_H | |
3 | ||
4 | /* TLB flushing routines.... */ | |
5 | ||
6 | #include <linux/config.h> | |
7 | #include <linux/mm.h> | |
8 | #include <asm/mmu_context.h> | |
9 | ||
04d472dc GG |
10 | |
11 | /* This is for the serialisation of PxTLB broadcasts. At least on the | |
12 | * N class systems, only one PxTLB inter processor broadcast can be | |
13 | * active at any one time on the Merced bus. This tlb purge | |
14 | * synchronisation is fairly lightweight and harmless so we activate | |
29a622dd MW |
15 | * it on all SMP systems not just the N class. We also need to have |
16 | * preemption disabled on uniprocessor machines, and spin_lock does that | |
17 | * nicely. | |
18 | */ | |
04d472dc GG |
19 | extern spinlock_t pa_tlb_lock; |
20 | ||
21 | #define purge_tlb_start(x) spin_lock(&pa_tlb_lock) | |
22 | #define purge_tlb_end(x) spin_unlock(&pa_tlb_lock) | |
23 | ||
1da177e4 LT |
24 | extern void flush_tlb_all(void); |
25 | ||
26 | /* | |
27 | * flush_tlb_mm() | |
28 | * | |
29 | * XXX This code is NOT valid for HP-UX compatibility processes, | |
30 | * (although it will probably work 99% of the time). HP-UX | |
31 | * processes are free to play with the space id's and save them | |
32 | * over long periods of time, etc. so we have to preserve the | |
33 | * space and just flush the entire tlb. We need to check the | |
34 | * personality in order to do that, but the personality is not | |
35 | * currently being set correctly. | |
36 | * | |
37 | * Of course, Linux processes could do the same thing, but | |
38 | * we don't support that (and the compilers, dynamic linker, | |
39 | * etc. do not do that). | |
40 | */ | |
41 | ||
42 | static inline void flush_tlb_mm(struct mm_struct *mm) | |
43 | { | |
44 | BUG_ON(mm == &init_mm); /* Should never happen */ | |
45 | ||
46 | #ifdef CONFIG_SMP | |
47 | flush_tlb_all(); | |
48 | #else | |
49 | if (mm) { | |
50 | if (mm->context != 0) | |
51 | free_sid(mm->context); | |
52 | mm->context = alloc_sid(); | |
53 | if (mm == current->active_mm) | |
54 | load_context(mm->context); | |
55 | } | |
56 | #endif | |
57 | } | |
58 | ||
59 | extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end) | |
60 | { | |
61 | } | |
62 | ||
63 | static inline void flush_tlb_page(struct vm_area_struct *vma, | |
64 | unsigned long addr) | |
65 | { | |
66 | /* For one page, it's not worth testing the split_tlb variable */ | |
67 | ||
68 | mb(); | |
69 | mtsp(vma->vm_mm->context,1); | |
70 | purge_tlb_start(); | |
71 | pdtlb(addr); | |
72 | pitlb(addr); | |
73 | purge_tlb_end(); | |
74 | } | |
75 | ||
76 | static inline void flush_tlb_range(struct vm_area_struct *vma, | |
77 | unsigned long start, unsigned long end) | |
78 | { | |
79 | unsigned long npages; | |
80 | ||
1da177e4 | 81 | npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
896a3756 | 82 | if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */ |
1da177e4 LT |
83 | flush_tlb_all(); |
84 | else { | |
1da177e4 | 85 | mtsp(vma->vm_mm->context,1); |
896a3756 | 86 | purge_tlb_start(); |
1da177e4 | 87 | if (split_tlb) { |
1da177e4 LT |
88 | while (npages--) { |
89 | pdtlb(start); | |
90 | pitlb(start); | |
91 | start += PAGE_SIZE; | |
92 | } | |
1da177e4 | 93 | } else { |
1da177e4 LT |
94 | while (npages--) { |
95 | pdtlb(start); | |
96 | start += PAGE_SIZE; | |
97 | } | |
1da177e4 | 98 | } |
896a3756 | 99 | purge_tlb_end(); |
1da177e4 LT |
100 | } |
101 | } | |
102 | ||
103 | #define flush_tlb_kernel_range(start, end) flush_tlb_all() | |
104 | ||
105 | #endif |