MIPS: malta: spaces.h: Add spaces.h file for Malta (EVA)

/*

 * 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) 2014 Imagination Technologies Ltd.

 */

#ifndef _ASM_MALTA_SPACES_H

#define _ASM_MALTA_SPACES_H

#ifdef CONFIG_EVA

/*

 * Traditional Malta Board Memory Map for EVA

 *

 * 0x00000000 - 0x0fffffff: 1st RAM region, 256MB

 * 0x10000000 - 0x1bffffff: GIC and CPC Control Registers

 * 0x1c000000 - 0x1fffffff: I/O And Flash

 * 0x20000000 - 0x7fffffff: 2nd RAM region, 1.5GB

 * 0x80000000 - 0xffffffff: Physical memory aliases to 0x0 (2GB)

 *

 * The kernel is still located in 0x80000000(kseg0). However,

 * the physical mask has been shifted to 0x80000000 which exploits the alias

 * on the Malta board. As a result of which, we override the __pa_symbol

 * to peform direct mapping from virtual to physical addresses. In other

 * words, the 0x80000000 virtual address maps to 0x80000000 physical address

 * which in turn aliases to 0x0. We do this in order to be able to use a flat

 * 2GB of memory (0x80000000 - 0xffffffff) so we can avoid the I/O hole in

 * 0x10000000 - 0x1fffffff.

 * The last 64KB of physical memory are reserved for correct HIGHMEM

 * macros arithmetics.

 *

 */

#define PAGE_OFFSET	_AC(0x0, UL)

#define PHYS_OFFSET	_AC(0x80000000, UL)

#define HIGHMEM_START	_AC(0xffff0000, UL)

#define __pa_symbol(x)	(RELOC_HIDE((unsigned long)(x), 0))

#endif /* CONFIG_EVA */

#include <asm/mach-generic/spaces.h>

#endif /* _ASM_MALTA_SPACES_H */