]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _ALPHA_CACHEFLUSH_H |
3 | #define _ALPHA_CACHEFLUSH_H | |
4 | ||
1da177e4 LT |
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) | |
ec8c0446 | 10 | #define flush_cache_dup_mm(mm) do { } while (0) |
1da177e4 LT |
11 | #define flush_cache_range(vma, start, end) do { } while (0) |
12 | #define flush_cache_page(vma, vmaddr, pfn) do { } while (0) | |
2d4dc890 | 13 | #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 |
1da177e4 LT |
14 | #define flush_dcache_page(page) do { } while (0) |
15 | #define flush_dcache_mmap_lock(mapping) do { } while (0) | |
16 | #define flush_dcache_mmap_unlock(mapping) do { } while (0) | |
17 | #define flush_cache_vmap(start, end) do { } while (0) | |
18 | #define flush_cache_vunmap(start, end) do { } while (0) | |
19 | ||
20 | /* Note that the following two definitions are _highly_ dependent | |
21 | on the contexts in which they are used in the kernel. I personally | |
22 | think it is criminal how loosely defined these macros are. */ | |
23 | ||
24 | /* We need to flush the kernel's icache after loading modules. The | |
25 | only other use of this macro is in load_aout_interp which is not | |
26 | used on Alpha. | |
27 | ||
28 | Note that this definition should *not* be used for userspace | |
29 | icache flushing. While functional, it is _way_ overkill. The | |
30 | icache is tagged with ASNs and it suffices to allocate a new ASN | |
31 | for the process. */ | |
32 | #ifndef CONFIG_SMP | |
33 | #define flush_icache_range(start, end) imb() | |
34 | #else | |
35 | #define flush_icache_range(start, end) smp_imb() | |
36 | extern void smp_imb(void); | |
37 | #endif | |
38 | ||
39 | /* We need to flush the userspace icache after setting breakpoints in | |
40 | ptrace. | |
41 | ||
42 | Instead of indiscriminately using imb, take advantage of the fact | |
43 | that icache entries are tagged with the ASN and load a new mm context. */ | |
44 | /* ??? Ought to use this in arch/alpha/kernel/signal.c too. */ | |
45 | ||
46 | #ifndef CONFIG_SMP | |
b97f897d TH |
47 | #include <linux/sched.h> |
48 | ||
1da177e4 LT |
49 | extern void __load_new_mm_context(struct mm_struct *); |
50 | static inline void | |
51 | flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
52 | unsigned long addr, int len) | |
53 | { | |
54 | if (vma->vm_flags & VM_EXEC) { | |
55 | struct mm_struct *mm = vma->vm_mm; | |
56 | if (current->active_mm == mm) | |
57 | __load_new_mm_context(mm); | |
58 | else | |
59 | mm->context[smp_processor_id()] = 0; | |
60 | } | |
61 | } | |
62 | #else | |
63 | extern void flush_icache_user_range(struct vm_area_struct *vma, | |
64 | struct page *page, unsigned long addr, int len); | |
65 | #endif | |
66 | ||
a335b2e1 | 67 | /* This is used only in __do_fault and do_swap_page. */ |
1da177e4 LT |
68 | #define flush_icache_page(vma, page) \ |
69 | flush_icache_user_range((vma), (page), 0, 0) | |
70 | ||
71 | #define copy_to_user_page(vma, page, vaddr, dst, src, len) \ | |
72 | do { memcpy(dst, src, len); \ | |
73 | flush_icache_user_range(vma, page, vaddr, len); \ | |
74 | } while (0) | |
75 | #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ | |
76 | memcpy(dst, src, len) | |
77 | ||
78 | #endif /* _ALPHA_CACHEFLUSH_H */ |