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