projects / thirdparty / linux.git / blame
| 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 */ |