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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ALPHA_CACHEFLUSH_H
2#define _ALPHA_CACHEFLUSH_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/mm.h>
5
6/* Caches aren't brain-dead on the Alpha. */
7#define flush_cache_all() do { } while (0)
8#define flush_cache_mm(mm) do { } while (0)
9#define flush_cache_range(vma, start, end) do { } while (0)
10#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
11#define flush_dcache_page(page) do { } while (0)
12#define flush_dcache_mmap_lock(mapping) do { } while (0)
13#define flush_dcache_mmap_unlock(mapping) do { } while (0)
14#define flush_cache_vmap(start, end) do { } while (0)
15#define flush_cache_vunmap(start, end) do { } while (0)
16
17/* Note that the following two definitions are _highly_ dependent
18 on the contexts in which they are used in the kernel. I personally
19 think it is criminal how loosely defined these macros are. */
20
21/* We need to flush the kernel's icache after loading modules. The
22 only other use of this macro is in load_aout_interp which is not
23 used on Alpha.
24
25 Note that this definition should *not* be used for userspace
26 icache flushing. While functional, it is _way_ overkill. The
27 icache is tagged with ASNs and it suffices to allocate a new ASN
28 for the process. */
29#ifndef CONFIG_SMP
30#define flush_icache_range(start, end) imb()
31#else
32#define flush_icache_range(start, end) smp_imb()
33extern void smp_imb(void);
34#endif
35
36/* We need to flush the userspace icache after setting breakpoints in
37 ptrace.
38
39 Instead of indiscriminately using imb, take advantage of the fact
40 that icache entries are tagged with the ASN and load a new mm context. */
41/* ??? Ought to use this in arch/alpha/kernel/signal.c too. */
42
43#ifndef CONFIG_SMP
44extern void __load_new_mm_context(struct mm_struct *);
45static inline void
46flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
47 unsigned long addr, int len)
48{
49 if (vma->vm_flags & VM_EXEC) {
50 struct mm_struct *mm = vma->vm_mm;
51 if (current->active_mm == mm)
52 __load_new_mm_context(mm);
53 else
54 mm->context[smp_processor_id()] = 0;
55 }
56}
57#else
58extern void flush_icache_user_range(struct vm_area_struct *vma,
59 struct page *page, unsigned long addr, int len);
60#endif
61
62/* This is used only in do_no_page and do_swap_page. */
63#define flush_icache_page(vma, page) \
64 flush_icache_user_range((vma), (page), 0, 0)
65
66#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
67do { memcpy(dst, src, len); \
68 flush_icache_user_range(vma, page, vaddr, len); \
69} while (0)
70#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
71 memcpy(dst, src, len)
72
73#endif /* _ALPHA_CACHEFLUSH_H */