unicore32 core architecture: mm related: generic codes

This patch includes generic codes for memory management.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/unicore32/include/asm/cache.h b/arch/unicore32/include/asm/cache.h
new file mode 100644
index 000000000000..ad8f795d86ca
--- /dev/null
+++ b/arch/unicore32/include/asm/cache.h
@@ -0,0 +1,27 @@
+/*
+ * linux/arch/unicore32/include/asm/cache.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ */
+#ifndef __UNICORE_CACHE_H__
+#define __UNICORE_CACHE_H__
+
+#define L1_CACHE_SHIFT          (5)
+#define L1_CACHE_BYTES          (1 << L1_CACHE_SHIFT)
+
+/*
+ * Memory returned by kmalloc() may be used for DMA, so we must make
+ * sure that all such allocations are cache aligned. Otherwise,
+ * unrelated code may cause parts of the buffer to be read into the
+ * cache before the transfer is done, causing old data to be seen by
+ * the CPU.
+ */
+#define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
+
+#endif