| 1 | #ifndef _ALPHA_CACHEFLUSH_H
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| 2 | #define _ALPHA_CACHEFLUSH_H
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| 3 |
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| 4 | #include <linux/mm.h>
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| 5 |
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| 6 |
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| 7 | #define flush_cache_all() do { } while (0)
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| 8 | #define flush_cache_mm(mm) do { } while (0)
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| 9 | #define flush_cache_dup_mm(mm) do { } while (0)
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| 10 | #define flush_cache_range(vma, start, end) do { } while (0)
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| 11 | #define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
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| 12 | #define flush_dcache_page(page) do { } while (0)
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| 13 | #define flush_dcache_mmap_lock(mapping) do { } while (0)
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| 14 | #define flush_dcache_mmap_unlock(mapping) do { } while (0)
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| 15 | #define flush_cache_vmap(start, end) do { } while (0)
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| 16 | #define flush_cache_vunmap(start, end) do { } while (0)
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| 17 |
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| 18 | |
| 19 | on the contexts in which they are used in the kernel. I personally
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| 20 | think it is criminal how loosely defined these macros are.
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| 21 |
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| 22 | |
| 23 | only other use of this macro is in load_aout_interp which is not
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| 24 | used on Alpha.
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| 25 |
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| 26 | Note that this definition should *not* be used for userspace
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| 27 | icache flushing. While functional, it is _way_ overkill. The
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| 28 | icache is tagged with ASNs and it suffices to allocate a new ASN
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| 29 | for the process.
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| 30 | #ifndef CONFIG_SMP
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| 31 | #define flush_icache_range(start, end) imb()
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| 32 | #else
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| 33 | #define flush_icache_range(start, end) smp_imb()
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| 34 | extern void smp_imb(void);
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| 35 | #endif
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| 36 |
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| 37 | |
| 38 | ptrace.
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| 39 |
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| 40 | Instead of indiscriminately using imb, take advantage of the fact
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| 41 | that icache entries are tagged with the ASN and load a new mm context.
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| 42 |
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| 43 |
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| 44 | #ifndef CONFIG_SMP
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| 45 | extern void __load_new_mm_context(struct mm_struct *);
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| 46 | static inline void
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| 47 | flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
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| 48 | unsigned long addr, int len)
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| 49 | {
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| 50 | if (vma->vm_flags & VM_EXEC) {
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| 51 | struct mm_struct *mm = vma->vm_mm;
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| 52 | if (current->active_mm == mm)
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| 53 | __load_new_mm_context(mm);
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| 54 | else
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| 55 | mm->context[smp_processor_id()] = 0;
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| 56 | }
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| 57 | }
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| 58 | #else
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| 59 | extern void flush_icache_user_range(struct vm_area_struct *vma,
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| 60 | struct page *page, unsigned long addr, int len);
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| 61 | #endif
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| 62 |
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| 63 |
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| 64 | #define flush_icache_page(vma, page) \
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| 65 | flush_icache_user_range((vma), (page), 0, 0)
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| 66 |
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| 67 | #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
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| 68 | do { memcpy(dst, src, len); \
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| 69 | flush_icache_user_range(vma, page, vaddr, len); \
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| 70 | } while (0)
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| 71 | #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
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| 72 | memcpy(dst, src, len)
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| 73 |
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| 74 | #endif
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