eb27b78930e811460eb4ae0be49f4b5c9abffabf
[linux-2.6.git] / include / asm-parisc / tlbflush.h
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
10 extern void flush_tlb_all(void);
11
12 /*
13  * flush_tlb_mm()
14  *
15  * XXX This code is NOT valid for HP-UX compatibility processes,
16  * (although it will probably work 99% of the time). HP-UX
17  * processes are free to play with the space id's and save them
18  * over long periods of time, etc. so we have to preserve the
19  * space and just flush the entire tlb. We need to check the
20  * personality in order to do that, but the personality is not
21  * currently being set correctly.
22  *
23  * Of course, Linux processes could do the same thing, but
24  * we don't support that (and the compilers, dynamic linker,
25  * etc. do not do that).
26  */
27
28 static inline void flush_tlb_mm(struct mm_struct *mm)
29 {
30         BUG_ON(mm == &init_mm); /* Should never happen */
31
32 #ifdef CONFIG_SMP
33         flush_tlb_all();
34 #else
35         if (mm) {
36                 if (mm->context != 0)
37                         free_sid(mm->context);
38                 mm->context = alloc_sid();
39                 if (mm == current->active_mm)
40                         load_context(mm->context);
41         }
42 #endif
43 }
44
45 extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
46 {
47 }
48  
49 static inline void flush_tlb_page(struct vm_area_struct *vma,
50         unsigned long addr)
51 {
52         /* For one page, it's not worth testing the split_tlb variable */
53
54         mb();
55         mtsp(vma->vm_mm->context,1);
56         purge_tlb_start();
57         pdtlb(addr);
58         pitlb(addr);
59         purge_tlb_end();
60 }
61
62 static inline void flush_tlb_range(struct vm_area_struct *vma,
63         unsigned long start, unsigned long end)
64 {
65         unsigned long npages;
66
67         
68         npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
69         if (npages >= 512)  /* XXX arbitrary, should be tuned */
70                 flush_tlb_all();
71         else {
72
73                 mtsp(vma->vm_mm->context,1);
74                 if (split_tlb) {
75                         purge_tlb_start();
76                         while (npages--) {
77                                 pdtlb(start);
78                                 pitlb(start);
79                                 start += PAGE_SIZE;
80                         }
81                         purge_tlb_end();
82                 } else {
83                         purge_tlb_start();
84                         while (npages--) {
85                                 pdtlb(start);
86                                 start += PAGE_SIZE;
87                         }
88                         purge_tlb_end();
89                 }
90         }
91 }
92
93 #define flush_tlb_kernel_range(start, end) flush_tlb_all()
94
95 #endif