1/* 2 * linux/include/asm-arm/arch-ebsa285/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_MMU_H 20#define __ASM_ARCH_MMU_H 21 22#include <linux/config.h> 23 24#if defined(CONFIG_FOOTBRIDGE_ADDIN) 25/* 26 * If we may be using add-in footbridge mode, then we must 27 * use the out-of-line translation that makes use of the 28 * PCI BAR 29 */ 30#ifndef __ASSEMBLY__ 31extern unsigned long __virt_to_bus(unsigned long); 32extern unsigned long __bus_to_virt(unsigned long); 33#endif 34 35#elif defined(CONFIG_FOOTBRIDGE_HOST) 36 37#define __virt_to_bus__is_a_macro 38#define __virt_to_bus(x) ((x) - 0xe0000000) 39#define __bus_to_virt__is_a_macro 40#define __bus_to_virt(x) ((x) + 0xe0000000) 41 42#else 43 44#error "Undefined footbridge mode" 45 46#endif 47 48#if defined(CONFIG_ARCH_FOOTBRIDGE) 49 50/* Task size and page offset at 3GB */ 51#define TASK_SIZE (0xc0000000UL) 52#define PAGE_OFFSET (0xc0000000UL) 53 54#elif defined(CONFIG_ARCH_CO285) 55 56/* Task size and page offset at 1.5GB */ 57#define TASK_SIZE (0x60000000UL) 58#define PAGE_OFFSET (0x60000000UL) 59 60#else 61 62#error "Undefined footbridge architecture" 63 64#endif 65 66#define TASK_SIZE_26 (0x04000000UL) 67#define PHYS_OFFSET (0x00000000UL) 68 69/* 70 * This decides where the kernel will search for a free chunk of vm 71 * space during mmap's. 72 */ 73#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 74 75/* 76 * The DRAM is always contiguous. 77 */ 78#define __virt_to_phys__is_a_macro 79#define __virt_to_phys(vpage) ((unsigned long)(vpage) - PAGE_OFFSET) 80#define __phys_to_virt__is_a_macro 81#define __phys_to_virt(ppage) ((unsigned long)(ppage) + PAGE_OFFSET) 82 83#define PHYS_TO_NID(addr) (0) 84 85#endif 86