1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ALPHA_CACHEFLUSH_H 3 #define _ALPHA_CACHEFLUSH_H 4 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_dup_mm(mm) do { } while (0) 11 #define flush_cache_range(vma, start, end) do { } while (0) 12 #define flush_cache_page(vma, vmaddr, pfn) do { } while (0) 13 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 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 47 #include <linux/sched.h> 48 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 67 /* This is used only in __do_fault and do_swap_page. */ 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 */ 79