diff options
Diffstat (limited to 'kernel/arch/alpha/include/asm/cacheflush.h')
| -rw-r--r-- | kernel/arch/alpha/include/asm/cacheflush.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/kernel/arch/alpha/include/asm/cacheflush.h b/kernel/arch/alpha/include/asm/cacheflush.h new file mode 100644 index 000000000..a9cb6aa44 --- /dev/null +++ b/kernel/arch/alpha/include/asm/cacheflush.h @@ -0,0 +1,77 @@ +#ifndef _ALPHA_CACHEFLUSH_H +#define _ALPHA_CACHEFLUSH_H + +#include <linux/mm.h> + +/* Caches aren't brain-dead on the Alpha. */ +#define flush_cache_all() do { } while (0) +#define flush_cache_mm(mm) do { } while (0) +#define flush_cache_dup_mm(mm) do { } while (0) +#define flush_cache_range(vma, start, end) do { } while (0) +#define flush_cache_page(vma, vmaddr, pfn) do { } while (0) +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 +#define flush_dcache_page(page) do { } while (0) +#define flush_dcache_mmap_lock(mapping) do { } while (0) +#define flush_dcache_mmap_unlock(mapping) do { } while (0) +#define flush_cache_vmap(start, end) do { } while (0) +#define flush_cache_vunmap(start, end) do { } while (0) + +/* Note that the following two definitions are _highly_ dependent + on the contexts in which they are used in the kernel. I personally + think it is criminal how loosely defined these macros are. */ + +/* We need to flush the kernel's icache after loading modules. The + only other use of this macro is in load_aout_interp which is not + used on Alpha. + + Note that this definition should *not* be used for userspace + icache flushing. While functional, it is _way_ overkill. The + icache is tagged with ASNs and it suffices to allocate a new ASN + for the process. */ +#ifndef CONFIG_SMP +#define flush_icache_range(start, end) imb() +#else +#define flush_icache_range(start, end) smp_imb() +extern void smp_imb(void); +#endif + +/* We need to flush the userspace icache after setting breakpoints in + ptrace. + + Instead of indiscriminately using imb, take advantage of the fact + that icache entries are tagged with the ASN and load a new mm context. */ +/* ??? Ought to use this in arch/alpha/kernel/signal.c too. */ + +#ifndef CONFIG_SMP +#include <linux/sched.h> + +extern void __load_new_mm_context(struct mm_struct *); +static inline void +flush_icache_user_range(struct vm_area_struct *vma, struct page *page, + unsigned long addr, int len) +{ + if (vma->vm_flags & VM_EXEC) { + struct mm_struct *mm = vma->vm_mm; + if (current->active_mm == mm) + __load_new_mm_context(mm); + else + mm->context[smp_processor_id()] = 0; + } +} +#else +extern void flush_icache_user_range(struct vm_area_struct *vma, + struct page *page, unsigned long addr, int len); +#endif + +/* This is used only in __do_fault and do_swap_page. */ +#define flush_icache_page(vma, page) \ + flush_icache_user_range((vma), (page), 0, 0) + +#define copy_to_user_page(vma, page, vaddr, dst, src, len) \ +do { memcpy(dst, src, len); \ + flush_icache_user_range(vma, page, vaddr, len); \ +} while (0) +#define copy_from_user_page(vma, page, vaddr, dst, src, len) \ + memcpy(dst, src, len) + +#endif /* _ALPHA_CACHEFLUSH_H */ |