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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Grant Grundler04d472d2005-10-21 22:40:24 -040010
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
15 * it on all SMP systems not just the N class. */
16#ifdef CONFIG_SMP
17extern spinlock_t pa_tlb_lock;
18
19#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
20#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
21
22#else
23
24#define purge_tlb_start(x) do { } while(0)
25#define purge_tlb_end(x) do { } while (0)
26
27#endif
28
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030extern void flush_tlb_all(void);
31
32/*
33 * flush_tlb_mm()
34 *
35 * XXX This code is NOT valid for HP-UX compatibility processes,
36 * (although it will probably work 99% of the time). HP-UX
37 * processes are free to play with the space id's and save them
38 * over long periods of time, etc. so we have to preserve the
39 * space and just flush the entire tlb. We need to check the
40 * personality in order to do that, but the personality is not
41 * currently being set correctly.
42 *
43 * Of course, Linux processes could do the same thing, but
44 * we don't support that (and the compilers, dynamic linker,
45 * etc. do not do that).
46 */
47
48static inline void flush_tlb_mm(struct mm_struct *mm)
49{
50 BUG_ON(mm == &init_mm); /* Should never happen */
51
52#ifdef CONFIG_SMP
53 flush_tlb_all();
54#else
55 if (mm) {
56 if (mm->context != 0)
57 free_sid(mm->context);
58 mm->context = alloc_sid();
59 if (mm == current->active_mm)
60 load_context(mm->context);
61 }
62#endif
63}
64
65extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
66{
67}
68
69static inline void flush_tlb_page(struct vm_area_struct *vma,
70 unsigned long addr)
71{
72 /* For one page, it's not worth testing the split_tlb variable */
73
74 mb();
75 mtsp(vma->vm_mm->context,1);
76 purge_tlb_start();
77 pdtlb(addr);
78 pitlb(addr);
79 purge_tlb_end();
80}
81
82static inline void flush_tlb_range(struct vm_area_struct *vma,
83 unsigned long start, unsigned long end)
84{
85 unsigned long npages;
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
Grant Grundler896a3752005-10-21 22:40:07 -040088 if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 flush_tlb_all();
90 else {
Hugh Dickins663b97f2005-10-29 18:16:28 -070091 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 mtsp(vma->vm_mm->context,1);
Grant Grundler896a3752005-10-21 22:40:07 -040093 purge_tlb_start();
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 if (split_tlb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 while (npages--) {
96 pdtlb(start);
97 pitlb(start);
98 start += PAGE_SIZE;
99 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 while (npages--) {
102 pdtlb(start);
103 start += PAGE_SIZE;
104 }
Hugh Dickins663b97f2005-10-29 18:16:28 -0700105 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 }
Grant Grundler896a3752005-10-21 22:40:07 -0400107 purge_tlb_end();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 }
109}
110
111#define flush_tlb_kernel_range(start, end) flush_tlb_all()
112
113#endif