1 /* 2 * arch/arm/mach-footbridge/include/mach/memory.h 3 * 4 * Copyright (C) 1996-1999 Russell King. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Changelog: 11 * 20-Oct-1996 RMK Created 12 * 31-Dec-1997 RMK Fixed definitions to reduce warnings. 13 * 17-May-1998 DAG Added __virt_to_bus and __bus_to_virt functions. 14 * 21-Nov-1998 RMK Changed __virt_to_bus and __bus_to_virt to macros. 15 * 21-Mar-1999 RMK Added PAGE_OFFSET for co285 architecture. 16 * Renamed to memory.h 17 * Moved PAGE_OFFSET and TASK_SIZE here 18 */ 19 #ifndef __ASM_ARCH_MEMORY_H 20 #define __ASM_ARCH_MEMORY_H 21 22 23 #if defined(CONFIG_FOOTBRIDGE_ADDIN) 24 /* 25 * If we may be using add-in footbridge mode, then we must 26 * use the out-of-line translation that makes use of the 27 * PCI BAR 28 */ 29 #ifndef __ASSEMBLY__ 30 extern unsigned long __virt_to_bus(unsigned long); 31 extern unsigned long __bus_to_virt(unsigned long); 32 #endif 33 34 #elif defined(CONFIG_FOOTBRIDGE_HOST) 35 36 #define __virt_to_bus(x) ((x) - 0xe0000000) 37 #define __bus_to_virt(x) ((x) + 0xe0000000) 38 39 #else 40 41 #error "Undefined footbridge mode" 42 43 #endif 44 45 /* Task size and page offset at 3GB */ 46 #define TASK_SIZE UL(0xbf000000) 47 #define PAGE_OFFSET UL(0xc0000000) 48 49 /* 50 * Cache flushing area. 51 */ 52 #define FLUSH_BASE 0xf9000000 53 54 /* 55 * Physical DRAM offset. 56 */ 57 #define PHYS_OFFSET UL(0x00000000) 58 59 /* 60 * This decides where the kernel will search for a free chunk of vm 61 * space during mmap's. 62 */ 63 #define TASK_UNMAPPED_BASE ((TASK_SIZE + 0x01000000) / 3) 64 65 #define FLUSH_BASE_PHYS 0x50000000 66 67 #endif 68