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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef _PARISC_TLBFLUSH_H
2#define _PARISC_TLBFLUSH_H
3
4/* TLB flushing routines.... */
5
6#include <linux/mm.h>
7#include <asm/mmu_context.h>
8
9
10/* This is for the serialisation of PxTLB broadcasts. At least on the
11 * N class systems, only one PxTLB inter processor broadcast can be
12 * active at any one time on the Merced bus. This tlb purge
13 * synchronisation is fairly lightweight and harmless so we activate
14 * it on all SMP systems not just the N class. We also need to have
15 * preemption disabled on uniprocessor machines, and spin_lock does that
16 * nicely.
17 */
18extern spinlock_t pa_tlb_lock;
19
20#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
21#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
22
23extern void flush_tlb_all(void);
24extern void flush_tlb_all_local(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
42static 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
59extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
60{
61}
62
63static 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
76static inline void flush_tlb_range(struct vm_area_struct *vma,
77 unsigned long start, unsigned long end)
78{
79 unsigned long npages;
80
81 npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
82 if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */
83 flush_tlb_all();
84 else {
85 mtsp(vma->vm_mm->context,1);
86 purge_tlb_start();
87 if (split_tlb) {
88 while (npages--) {
89 pdtlb(start);
90 pitlb(start);
91 start += PAGE_SIZE;
92 }
93 } else {
94 while (npages--) {
95 pdtlb(start);
96 start += PAGE_SIZE;
97 }
98 }
99 purge_tlb_end();
100 }
101}
102
103#define flush_tlb_kernel_range(start, end) flush_tlb_all()
104
105#endif