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diff --git a/arch/mips/include/asm/mach-loongson/mem.h b/arch/mips/include/asm/mach-loongson/mem.h
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+++ b/arch/mips/include/asm/mach-loongson/mem.h
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+/*
+ * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
+ * Author: Wu Zhangjin <wuzj@lemote.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#ifndef __ASM_MACH_LOONGSON_MEM_H
+#define __ASM_MACH_LOONGSON_MEM_H
+
+/*
+ * On Lemote Loongson 2e
+ *
+ * the high memory space starts from 512M.
+ * the peripheral registers reside between 0x1000:0000 and 0x2000:0000.
+ */
+
+#ifdef CONFIG_LEMOTE_FULOONG2E
+
+#define LOONGSON_HIGHMEM_START 0x20000000
+
+#define LOONGSON_MMIO_MEM_START 0x10000000
+#define LOONGSON_MMIO_MEM_END 0x20000000
+
+#endif
+
+#endif /* __ASM_MACH_LOONGSON_MEM_H */
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