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| -rw-r--r-- | arch/mips/include/asm/mach-malta/spaces.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-malta/spaces.h b/arch/mips/include/asm/mach-malta/spaces.h new file mode 100644 index 000000000000..d7e54971ec66 --- /dev/null +++ b/arch/mips/include/asm/mach-malta/spaces.h @@ -0,0 +1,46 @@ +/* + * 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 */ |