xtensa: move kernel mapping addresses into kmem_layout.h

Create a header dedicated to memory layout definitions. Include it from
places where these definitions are needed.
Express vmalloc area address, VIRTUAL_MEMORY_ADDRESS and KERNELOFFSET
through KSEG address.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/asm/kmem_layout.h

@@ -0,0 +1,25 @@
+/*
+ * Kernel virtual memory layout definitions.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file "COPYING" in the main directory of
+ * this archive for more details.
+ *
+ * Copyright (C) 2016 Cadence Design Systems Inc.
+ */
+
+#ifndef _XTENSA_KMEM_LAYOUT_H
+#define _XTENSA_KMEM_LAYOUT_H
+
+#include <asm/types.h>
+
+/*
+ * Fixed TLB translations in the processor.
+ */
+
+#define XCHAL_KSEG_CACHED_VADDR	__XTENSA_UL_CONST(0xd0000000)
+#define XCHAL_KSEG_BYPASS_VADDR	__XTENSA_UL_CONST(0xd8000000)
+#define XCHAL_KSEG_SIZE		__XTENSA_UL_CONST(0x08000000)
+#define XCHAL_KSEG_PADDR	__XTENSA_UL_CONST(0x00000000)
+
+#endif