1 files changed, 67 insertions, 0 deletions

diff --git a/arch/powerpc/lib/pmem.c b/arch/powerpc/lib/pmem.c
new file mode 100644
index 000000000000..53c018762e1c
--- /dev/null
+++ b/arch/powerpc/lib/pmem.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright(c) 2017 IBM Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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.
+ */
+
+#include <linux/string.h>
+#include <linux/export.h>
+#include <linux/uaccess.h>
+
+#include <asm/cacheflush.h>
+
+/*
+ * CONFIG_ARCH_HAS_PMEM_API symbols
+ */
+void arch_wb_cache_pmem(void *addr, size_t size)
+{
+        unsigned long start = (unsigned long) addr;
+        flush_inval_dcache_range(start, start + size);
+}
+EXPORT_SYMBOL(arch_wb_cache_pmem);
+
+void arch_invalidate_pmem(void *addr, size_t size)
+{
+        unsigned long start = (unsigned long) addr;
+        flush_inval_dcache_range(start, start + size);
+}
+EXPORT_SYMBOL(arch_invalidate_pmem);
+
+/*
+ * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
+ */
+long __copy_from_user_flushcache(void *dest, const void __user *src,
+                unsigned size)
+{
+        unsigned long copied, start = (unsigned long) dest;
+
+        copied = __copy_from_user(dest, src, size);
+        flush_inval_dcache_range(start, start + size);
+
+        return copied;
+}
+
+void *memcpy_flushcache(void *dest, const void *src, size_t size)
+{
+        unsigned long start = (unsigned long) dest;
+
+        memcpy(dest, src, size);
+        flush_inval_dcache_range(start, start + size);
+
+        return dest;
+}
+EXPORT_SYMBOL(memcpy_flushcache);
+
+void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
+        size_t len)
+{
+        memcpy_flushcache(to, page_to_virt(page) + offset, len);
+}
+EXPORT_SYMBOL(memcpy_page_flushcache);