c9fede2afc
Add a spaces.h file for Malta to override certain memory macros when operating in EVA mode. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2014 Imagination Technologies Ltd.
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*/
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#ifndef _ASM_MALTA_SPACES_H
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#define _ASM_MALTA_SPACES_H
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#ifdef CONFIG_EVA
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/*
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* Traditional Malta Board Memory Map for EVA
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*
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* 0x00000000 - 0x0fffffff: 1st RAM region, 256MB
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* 0x10000000 - 0x1bffffff: GIC and CPC Control Registers
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* 0x1c000000 - 0x1fffffff: I/O And Flash
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* 0x20000000 - 0x7fffffff: 2nd RAM region, 1.5GB
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* 0x80000000 - 0xffffffff: Physical memory aliases to 0x0 (2GB)
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*
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* The kernel is still located in 0x80000000(kseg0). However,
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* the physical mask has been shifted to 0x80000000 which exploits the alias
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* on the Malta board. As a result of which, we override the __pa_symbol
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* to peform direct mapping from virtual to physical addresses. In other
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* words, the 0x80000000 virtual address maps to 0x80000000 physical address
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* which in turn aliases to 0x0. We do this in order to be able to use a flat
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* 2GB of memory (0x80000000 - 0xffffffff) so we can avoid the I/O hole in
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* 0x10000000 - 0x1fffffff.
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* The last 64KB of physical memory are reserved for correct HIGHMEM
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* macros arithmetics.
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*
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*/
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#define PAGE_OFFSET _AC(0x0, UL)
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#define PHYS_OFFSET _AC(0x80000000, UL)
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#define HIGHMEM_START _AC(0xffff0000, UL)
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#define __pa_symbol(x) (RELOC_HIDE((unsigned long)(x), 0))
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#endif /* CONFIG_EVA */
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#include <asm/mach-generic/spaces.h>
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#endif /* _ASM_MALTA_SPACES_H */
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