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 /* Note that the following two definitions are _highly_ dependent 8 on the contexts in which they are used in the kernel. I personally 9 think it is criminal how loosely defined these macros are. */ 10 11 /* We need to flush the kernel's icache after loading modules. The 12 only other use of this macro is in load_aout_interp which is not 13 used on Alpha. 14 15 Note that this definition should *not* be used for userspace 16 icache flushing. While functional, it is _way_ overkill. The 17 icache is tagged with ASNs and it suffices to allocate a new ASN 18 for the process. */ 19 #ifndef CONFIG_SMP 20 #define flush_icache_range(start, end) imb() 21 #else 22 #define flush_icache_range(start, end) smp_imb() 23 extern void smp_imb(void); 24 #endif 25 26 /* We need to flush the userspace icache after setting breakpoints in 27 ptrace. 28 29 Instead of indiscriminately using imb, take advantage of the fact 30 that icache entries are tagged with the ASN and load a new mm context. */ 31 /* ??? Ought to use this in arch/alpha/kernel/signal.c too. */ 32 33 #ifndef CONFIG_SMP 34 #include <linux/sched.h> 35 36 extern void __load_new_mm_context(struct mm_struct *); 37 static inline void 38 flush_icache_user_page(struct vm_area_struct *vma, struct page *page, 39 unsigned long addr, int len) 40 { 41 if (vma->vm_flags & VM_EXEC) { 42 struct mm_struct *mm = vma->vm_mm; 43 if (current->active_mm == mm) 44 __load_new_mm_context(mm); 45 else 46 mm->context[smp_processor_id()] = 0; 47 } 48 } 49 #define flush_icache_user_page flush_icache_user_page 50 #else /* CONFIG_SMP */ 51 extern void flush_icache_user_page(struct vm_area_struct *vma, 52 struct page *page, unsigned long addr, int len); 53 #define flush_icache_user_page flush_icache_user_page 54 #endif /* CONFIG_SMP */ 55 56 /* This is used only in __do_fault and do_swap_page. */ 57 #define flush_icache_page(vma, page) \ 58 flush_icache_user_page((vma), (page), 0, 0) 59 60 #include <asm-generic/cacheflush.h> 61 62 #endif /* _ALPHA_CACHEFLUSH_H */ 63