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memory.h
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memory.h
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/*
* arch/arm/mach-bcm2708/include/mach/memory.h
*
* Copyright (C) 2010 Broadcom
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H
/* Memory overview:
[ARMcore] <--virtual addr-->
[ARMmmu] <--physical addr-->
[GERTmap] <--bus add-->
[VCperiph]
*/
/*
* Physical DRAM offset.
*/
#define BCM_PLAT_PHYS_OFFSET UL(0x00000000)
#define VC_ARMMEM_OFFSET UL(0x00000000) /* offset in VC of ARM memory */
#ifdef CONFIG_BCM2708_NOL2CACHE
#define _REAL_BUS_OFFSET UL(0xC0000000) /* don't use L1 or L2 caches */
#else
#define _REAL_BUS_OFFSET UL(0x40000000) /* use L2 cache */
#endif
/* We're using the memory at 64M in the VideoCore for Linux - this adjustment
* will provide the offset into this area as well as setting the bits that
* stop the L1 and L2 cache from being used
*
* WARNING: this only works because the ARM is given memory at a fixed location
* (ARMMEM_OFFSET)
*/
#define BUS_OFFSET (VC_ARMMEM_OFFSET + _REAL_BUS_OFFSET)
#define __virt_to_bus(x) ((x) + (BUS_OFFSET - PAGE_OFFSET))
#define __bus_to_virt(x) ((x) - (BUS_OFFSET - PAGE_OFFSET))
#define __pfn_to_bus(x) (__pfn_to_phys(x) + (BUS_OFFSET - BCM_PLAT_PHYS_OFFSET))
#define __bus_to_pfn(x) __phys_to_pfn((x) - (BUS_OFFSET - BCM_PLAT_PHYS_OFFSET))
#endif