1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm64/lib/uaccess_flushcache.c b/arch/arm64/lib/uaccess_flushcache.c
new file mode 100644
index 000000000..baee22961
--- /dev/null
+++ b/arch/arm64/lib/uaccess_flushcache.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 ARM Ltd.
+ */
+
+#include <linux/uaccess.h>
+#include <asm/barrier.h>
+#include <asm/cacheflush.h>
+
+void memcpy_flushcache(void *dst, const void *src, size_t cnt)
+{
+	/*
+	 * We assume this should not be called with @dst pointing to
+	 * non-cacheable memory, such that we don't need an explicit
+	 * barrier to order the cache maintenance against the memcpy.
+	 */
+	memcpy(dst, src, cnt);
+	dcache_clean_pop((unsigned long)dst, (unsigned long)dst + cnt);
+}
+EXPORT_SYMBOL_GPL(memcpy_flushcache);
+
+void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
+			    size_t len)
+{
+	memcpy_flushcache(to, page_address(page) + offset, len);
+}
+
+unsigned long __copy_user_flushcache(void *to, const void __user *from,
+				     unsigned long n)
+{
+	unsigned long rc;
+
+	rc = raw_copy_from_user(to, from, n);
+
+	/* See above */
+	dcache_clean_pop((unsigned long)to, (unsigned long)to + n - rc);
+	return rc;
+}