1/* 2 * linux/include/asm-arm/arch-clps711x/mmu.h 3 * 4 * Copyright (C) 1999 ARM Limited 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 as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20#ifndef __ASM_ARCH_MMU_H 21#define __ASM_ARCH_MMU_H 22 23#include <linux/config.h> 24 25/* 26 * Task size: 3GB 27 */ 28#define TASK_SIZE (0xc0000000UL) 29#define TASK_SIZE_26 (0x04000000UL) 30 31/* 32 * This decides where the kernel will search for a free chunk of vm 33 * space during mmap's. 34 */ 35#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 36 37/* 38 * Page offset: 3GB 39 */ 40#define PAGE_OFFSET (0xc0000000UL) 41#define PHYS_OFFSET (0xc0000000UL) 42 43/* 44 * On integrator, the dram is contiguous 45 */ 46#define __virt_to_phys__is_a_macro 47#define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET) 48#define __phys_to_virt__is_a_macro 49#define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET) 50 51/* 52 * Virtual view <-> DMA view memory address translations 53 * virt_to_bus: Used to translate the virtual address to an 54 * address suitable to be passed to set_dma_addr 55 * bus_to_virt: Used to convert an address for DMA operations 56 * to an address that the kernel can use. 57 */ 58 59#if defined(CONFIG_ARCH_CDB89712) 60 61#define __virt_to_bus__is_a_macro 62#define __virt_to_bus(x) (x) 63#define __bus_to_virt__is_a_macro 64#define __bus_to_virt(x) (x) 65 66#elif defined(CONFIG_ARCH_AUTCPU12) 67 68#define __virt_to_bus__is_a_macro 69#define __virt_to_bus(x) (x) 70#define __bus_to_virt__is_a_macro 71#define __bus_to_virt(x) (x) 72 73#else 74 75#define __virt_to_bus__is_a_macro 76#define __virt_to_bus(x) ((x) - PAGE_OFFSET) 77#define __bus_to_virt__is_a_macro 78#define __bus_to_virt(x) ((x) + PAGE_OFFSET) 79 80#endif 81 82 83/* 84 * Like the SA1100, the EDB7211 has a large gap between physical RAM 85 * banks. In 2.2, the Psion (CL-PS7110) port added custom support for 86 * discontiguous physical memory. In 2.4, we can use the standard 87 * Linux NUMA support. 88 * 89 * This is not necessary for EP7211 implementations with only one used 90 * memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM. 91 */ 92 93#ifdef CONFIG_ARCH_EDB7211 94 95#ifdef CONFIG_DISCONTIGMEM 96/* 97 * Because of the wide memory address space between physical RAM banks on the 98 * SA1100, it's much more convenient to use Linux's NUMA support to implement 99 * our memory map representation. Assuming all memory nodes have equal access 100 * characteristics, we then have generic discontigous memory support. 101 * 102 * Of course, all this isn't mandatory for SA1100 implementations with only 103 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM. 104 * 105 * The nodes are matched with the physical memory bank addresses which are 106 * incidentally the same as virtual addresses. 107 * 108 * node 0: 0xc0000000 - 0xc7ffffff 109 * node 1: 0xc8000000 - 0xcfffffff 110 * node 2: 0xd0000000 - 0xd7ffffff 111 * node 3: 0xd8000000 - 0xdfffffff 112 */ 113 114#define NR_NODES 4 115 116/* 117 * Given a kernel address, find the home node of the underlying memory. 118 */ 119#define KVADDR_TO_NID(addr) \ 120 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT) 121 122/* 123 * Given a physical address, convert it to a node id. 124 */ 125#define PHYS_TO_NID(addr) KVADDR_TO_NID(__phys_to_virt(addr)) 126 127/* 128 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory 129 * and returns the mem_map of that node. 130 */ 131#define ADDR_TO_MAPBASE(kaddr) \ 132 NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr))) 133 134/* 135 * Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory 136 * and returns the index corresponding to the appropriate page in the 137 * node's mem_map. 138 */ 139#define LOCAL_MAP_NR(kaddr) \ 140 (((unsigned long)(kaddr)-LOCAL_BASE_ADDR((kaddr))) >> PAGE_SHIFT) 141 142/* 143 * Given a kaddr, virt_to_page returns a pointer to the corresponding 144 * mem_map entry. 145 */ 146#define virt_to_page(kaddr) \ 147 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) 148 149/* 150 * VALID_PAGE returns a non-zero value if given page pointer is valid. 151 * This assumes all node's mem_maps are stored within the node they refer to. 152 */ 153#define VALID_PAGE(page) \ 154({ unsigned int node = KVADDR_TO_NID(page); \ 155 ( (node < NR_NODES) && \ 156 ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size) ); \ 157}) 158 159/* 160 * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211 161 * uses only one of the two banks (bank #1). However, even within 162 * bank #1, memory is discontiguous. 163 * 164 * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between 165 * them, so we use 24 for the node max shift to get 16MB node sizes. 166 */ 167#define NODE_MAX_MEM_SHIFT 24 168#define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT) 169 170/* 171 * Given a mem_map_t, LOCAL_MAP_BASE finds the owning node for the 172 * physical page and returns the kaddr for the mem_map of that node. 173 */ 174#define LOCAL_MAP_BASE(page) \ 175 NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(page))) 176 177/* 178 * Given a kaddr, LOCAL_BASE_ADDR finds the owning node of the memory 179 * and returns the kaddr corresponding to first physical page in the 180 * node's mem_map. 181 */ 182#define LOCAL_BASE_ADDR(kaddr) ((unsigned long)(kaddr) & ~(NODE_MAX_MEM_SIZE-1)) 183 184/* 185 * With discontigmem, the conceptual mem_map array starts from PAGE_OFFSET. 186 * Given a kaddr, MAP_NR returns the appropriate global mem_map index so 187 * it matches the corresponding node's local mem_map. 188 */ 189#define MAP_NR(kaddr) (LOCAL_MAP_NR((kaddr)) + \ 190 (((unsigned long)ADDR_TO_MAPBASE((kaddr)) - PAGE_OFFSET) / \ 191 sizeof(mem_map_t))) 192 193#else 194 195#define PHYS_TO_NID(addr) (0) 196 197#endif /* CONFIG_DISCONTIGMEM */ 198 199#endif /* CONFIG_ARCH_EDB7211 */ 200 201#ifndef PHYS_TO_NID 202#define PHYS_TO_NID(addr) (0) 203#endif 204 205#endif 206 207