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authorRobin Murphy <robin.murphy@arm.com>2017-08-10 10:49:21 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2017-08-10 10:49:21 +0100
commit21cfa0e96d1d521bec4e2f22a19437080e1357e7 (patch)
tree012ffd22fd715a2b55928f17c0c711d2087a1790 /arch/arm64
parent6ec4e2514decd6fb4782a9364fa71d6244d05af4 (diff)
arm64: uaccess: Add the uaccess_flushcache.c file
The uaccess_flushcache.c file was inadvertently dropped by the maintainer in a previous commit. Add it back. Fixes: 5d7bdeb1eeb2 ("arm64: uaccess: Implement *_flushcache variants") Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/lib/uaccess_flushcache.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/arm64/lib/uaccess_flushcache.c b/arch/arm64/lib/uaccess_flushcache.c
new file mode 100644
index 000000000000..b6ceafdb8b72
--- /dev/null
+++ b/arch/arm64/lib/uaccess_flushcache.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2017 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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);
+ __clean_dcache_area_pop(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 = __arch_copy_from_user(to, from, n);
+
+ /* See above */
+ __clean_dcache_area_pop(to, n - rc);
+ return rc;
+}