| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * Copyright (C) 2017 ARM Ltd. |
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| 4 | */ |
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| 5 | |
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| 6 | #include <linux/uaccess.h> |
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| 7 | #include <asm/barrier.h> |
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| 8 | #include <asm/cacheflush.h> |
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| 9 | |
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| 10 | void memcpy_flushcache(void *dst, const void *src, size_t cnt) |
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| 11 | { |
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| 12 | /* |
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| 13 | * We assume this should not be called with @dst pointing to |
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| 14 | * non-cacheable memory, such that we don't need an explicit |
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| 15 | * barrier to order the cache maintenance against the memcpy. |
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| 16 | */ |
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| 17 | memcpy(dst, src, cnt); |
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| 18 | dcache_clean_pop((unsigned long)dst, (unsigned long)dst + cnt); |
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| 19 | } |
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| 20 | EXPORT_SYMBOL_GPL(memcpy_flushcache); |
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| 21 | |
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| 22 | unsigned long __copy_user_flushcache(void *to, const void __user *from, |
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| 23 | unsigned long n) |
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| 24 | { |
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| 25 | unsigned long rc; |
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| 26 | |
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| 27 | rc = raw_copy_from_user(dst: to, src: from, size: n); |
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| 28 | |
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| 29 | /* See above */ |
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| 30 | dcache_clean_pop((unsigned long)to, (unsigned long)to + n - rc); |
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| 31 | return rc; |
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| 32 | } |
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| 33 | |
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