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/* * arch/arm/mach-footbridge/include/mach/memory.h * * Copyright (C) 1996-1999 Russell King. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Changelog: * 20-Oct-1996 RMK Created * 31-Dec-1997 RMK Fixed definitions to reduce warnings. * 17-May-1998 DAG Added __virt_to_bus and __bus_to_virt functions. * 21-Nov-1998 RMK Changed __virt_to_bus and __bus_to_virt to macros. * 21-Mar-1999 RMK Added PAGE_OFFSET for co285 architecture. * Renamed to memory.h * Moved PAGE_OFFSET and TASK_SIZE here */ #ifndef __ASM_ARCH_MEMORY_H #define __ASM_ARCH_MEMORY_H #if defined(CONFIG_FOOTBRIDGE_ADDIN) /* * If we may be using add-in footbridge mode, then we must * use the out-of-line translation that makes use of the * PCI BAR */ #ifndef __ASSEMBLY__ extern unsigned long __virt_to_bus(unsigned long); extern unsigned long __bus_to_virt(unsigned long); extern unsigned long __pfn_to_bus(unsigned long); extern unsigned long __bus_to_pfn(unsigned long); #endif #define __virt_to_bus __virt_to_bus #define __bus_to_virt __bus_to_virt #elif defined(CONFIG_FOOTBRIDGE_HOST) /* * The footbridge is programmed to expose the system RAM at 0xe0000000. * The requirement is that the RAM isn't placed at bus address 0, which * would clash with VGA cards. */ #define BUS_OFFSET 0xe0000000 #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 - PHYS_OFFSET)) #define __bus_to_pfn(x) __phys_to_pfn((x) - (BUS_OFFSET - PHYS_OFFSET)) #else #error "Undefined footbridge mode" #endif /* * Cache flushing area. */ #define FLUSH_BASE 0xf9000000 /* * Physical DRAM offset. */ #define PLAT_PHYS_OFFSET UL(0x00000000) #define FLUSH_BASE_PHYS 0x50000000 #endif