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_DISCONTIGMEM 94 /* 95 * Because of the wide memory address space between physical RAM banks on the 96 * SA1100, it's much more convenient to use Linux's NUMA support to implement 97 * our memory map representation. Assuming all memory nodes have equal access 98 * characteristics, we then have generic discontigous memory support. 99 * 100 * Of course, all this isn't mandatory for SA1100 implementations with only 101 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM. 102 * 103 * The nodes are matched with the physical memory bank addresses which are 104 * incidentally the same as virtual addresses. 105 * 106 * node 0: 0xc0000000 - 0xc7ffffff 107 * node 1: 0xc8000000 - 0xcfffffff 108 * node 2: 0xd0000000 - 0xd7ffffff 109 * node 3: 0xd8000000 - 0xdfffffff 110 */ 111 112 #define NR_NODES 4 113 114 /* 115 * Given a kernel address, find the home node of the underlying memory. 116 */ 117 #define KVADDR_TO_NID(addr) \ 118 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT) 119 120 /* 121 * Given a page frame number, convert it to a node id. 122 */ 123 #define PFN_TO_NID(pfn) \ 124 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT)) 125 126 /* 127 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory 128 * and returns the mem_map of that node. 129 */ 130 #define ADDR_TO_MAPBASE(kaddr) \ 131 NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr))) 132 133 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) 134 135 /* 136 * Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory 137 * and returns the index corresponding to the appropriate page in the 138 * node's mem_map. 139 */ 140 #define LOCAL_MAP_NR(addr) \ 141 (((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT) 142 143 /* 144 * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211 145 * uses only one of the two banks (bank #1). However, even within 146 * bank #1, memory is discontiguous. 147 * 148 * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between 149 * them, so we use 24 for the node max shift to get 16MB node sizes. 150 */ 151 #define NODE_MAX_MEM_SHIFT 24 152 #define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT) 153 154 #endif /* CONFIG_DISCONTIGMEM */ 155 156 #endif 157 158