Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/include/asm-alpha/cacheflush.h
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 2607 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | #ifndef _ALPHA_CACHEFLUSH_H |
2 | #define _ALPHA_CACHEFLUSH_H |
3 | |
4 | #include <linux/config.h> |
5 | #include <linux/mm.h> |
6 | |
7 | /* Caches aren't brain-dead on the Alpha. */ |
8 | #define flush_cache_all() do { } while (0) |
9 | #define flush_cache_mm(mm) do { } while (0) |
10 | #define flush_cache_range(vma, start, end) do { } while (0) |
11 | #define flush_cache_page(vma, vmaddr, pfn) do { } while (0) |
12 | #define flush_dcache_page(page) do { } while (0) |
13 | #define flush_dcache_mmap_lock(mapping) do { } while (0) |
14 | #define flush_dcache_mmap_unlock(mapping) do { } while (0) |
15 | #define flush_cache_vmap(start, end) do { } while (0) |
16 | #define flush_cache_vunmap(start, end) do { } while (0) |
17 | |
18 | /* Note that the following two definitions are _highly_ dependent |
19 | on the contexts in which they are used in the kernel. I personally |
20 | think it is criminal how loosely defined these macros are. */ |
21 | |
22 | /* We need to flush the kernel's icache after loading modules. The |
23 | only other use of this macro is in load_aout_interp which is not |
24 | used on Alpha. |
25 | |
26 | Note that this definition should *not* be used for userspace |
27 | icache flushing. While functional, it is _way_ overkill. The |
28 | icache is tagged with ASNs and it suffices to allocate a new ASN |
29 | for the process. */ |
30 | #ifndef CONFIG_SMP |
31 | #define flush_icache_range(start, end) imb() |
32 | #else |
33 | #define flush_icache_range(start, end) smp_imb() |
34 | extern void smp_imb(void); |
35 | #endif |
36 | |
37 | /* We need to flush the userspace icache after setting breakpoints in |
38 | ptrace. |
39 | |
40 | Instead of indiscriminately using imb, take advantage of the fact |
41 | that icache entries are tagged with the ASN and load a new mm context. */ |
42 | /* ??? Ought to use this in arch/alpha/kernel/signal.c too. */ |
43 | |
44 | #ifndef CONFIG_SMP |
45 | extern void __load_new_mm_context(struct mm_struct *); |
46 | static inline void |
47 | flush_icache_user_range(struct vm_area_struct *vma, struct page *page, |
48 | unsigned long addr, int len) |
49 | { |
50 | if (vma->vm_flags & VM_EXEC) { |
51 | struct mm_struct *mm = vma->vm_mm; |
52 | if (current->active_mm == mm) |
53 | __load_new_mm_context(mm); |
54 | else |
55 | mm->context[smp_processor_id()] = 0; |
56 | } |
57 | } |
58 | #else |
59 | extern void flush_icache_user_range(struct vm_area_struct *vma, |
60 | struct page *page, unsigned long addr, int len); |
61 | #endif |
62 | |
63 | /* This is used only in do_no_page and do_swap_page. */ |
64 | #define flush_icache_page(vma, page) \ |
65 | flush_icache_user_range((vma), (page), 0, 0) |
66 | |
67 | #define copy_to_user_page(vma, page, vaddr, dst, src, len) \ |
68 | do { memcpy(dst, src, len); \ |
69 | flush_icache_user_range(vma, page, vaddr, len); \ |
70 | } while (0) |
71 | #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ |
72 | memcpy(dst, src, len) |
73 | |
74 | #endif /* _ALPHA_CACHEFLUSH_H */ |