1 /* 2 * arch/arm/include/asm/memory.h 3 * 4 * Copyright (C) 2000-2002 Russell King 5 * modification for nommu, Hyok S. Choi, 2004 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Note: this file should not be included by non-asm/.h files 12 */ 13 #ifndef __ASM_ARM_MEMORY_H 14 #define __ASM_ARM_MEMORY_H 15 16 #include <linux/compiler.h> 17 #include <linux/const.h> 18 #include <mach/memory.h> 19 #include <asm/sizes.h> 20 21 /* 22 * Allow for constants defined here to be used from assembly code 23 * by prepending the UL suffix only with actual C code compilation. 24 */ 25 #define UL(x) _AC(x, UL) 26 27 #ifdef CONFIG_MMU 28 29 /* 30 * PAGE_OFFSET - the virtual address of the start of the kernel image 31 * TASK_SIZE - the maximum size of a user space task. 32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 33 */ 34 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 35 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) 36 #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) 37 38 /* 39 * The maximum size of a 26-bit user space task. 40 */ 41 #define TASK_SIZE_26 UL(0x04000000) 42 43 /* 44 * The module space lives between the addresses given by TASK_SIZE 45 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 46 */ 47 #ifndef CONFIG_THUMB2_KERNEL 48 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) 49 #else 50 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 51 #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) 52 #endif 53 54 #if TASK_SIZE > MODULES_VADDR 55 #error Top of user space clashes with start of module space 56 #endif 57 58 /* 59 * The highmem pkmap virtual space shares the end of the module area. 60 */ 61 #ifdef CONFIG_HIGHMEM 62 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 63 #else 64 #define MODULES_END (PAGE_OFFSET) 65 #endif 66 67 /* 68 * The XIP kernel gets mapped at the bottom of the module vm area. 69 * Since we use sections to map it, this macro replaces the physical address 70 * with its virtual address while keeping offset from the base section. 71 */ 72 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 73 74 /* 75 * Allow 16MB-aligned ioremap pages 76 */ 77 #define IOREMAP_MAX_ORDER 24 78 79 #else /* CONFIG_MMU */ 80 81 /* 82 * The limitation of user task size can grow up to the end of free ram region. 83 * It is difficult to define and perhaps will never meet the original meaning 84 * of this define that was meant to. 85 * Fortunately, there is no reference for this in noMMU mode, for now. 86 */ 87 #ifndef TASK_SIZE 88 #define TASK_SIZE (CONFIG_DRAM_SIZE) 89 #endif 90 91 #ifndef TASK_UNMAPPED_BASE 92 #define TASK_UNMAPPED_BASE UL(0x00000000) 93 #endif 94 95 #ifndef PHYS_OFFSET 96 #define PHYS_OFFSET (CONFIG_DRAM_BASE) 97 #endif 98 99 #ifndef END_MEM 100 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE) 101 #endif 102 103 #ifndef PAGE_OFFSET 104 #define PAGE_OFFSET (PHYS_OFFSET) 105 #endif 106 107 /* 108 * The module can be at any place in ram in nommu mode. 109 */ 110 #define MODULES_END (END_MEM) 111 #define MODULES_VADDR (PHYS_OFFSET) 112 113 #endif /* !CONFIG_MMU */ 114 115 /* 116 * Size of DMA-consistent memory region. Must be multiple of 2M, 117 * between 2MB and 14MB inclusive. 118 */ 119 #ifndef CONSISTENT_DMA_SIZE 120 #define CONSISTENT_DMA_SIZE SZ_2M 121 #endif 122 123 /* 124 * Physical vs virtual RAM address space conversion. These are 125 * private definitions which should NOT be used outside memory.h 126 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 127 */ 128 #ifndef __virt_to_phys 129 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 130 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 131 #endif 132 133 /* 134 * Convert a physical address to a Page Frame Number and back 135 */ 136 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) 137 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 138 139 /* 140 * Convert a page to/from a physical address 141 */ 142 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 143 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 144 145 #ifndef __ASSEMBLY__ 146 147 /* 148 * The DMA mask corresponding to the maximum bus address allocatable 149 * using GFP_DMA. The default here places no restriction on DMA 150 * allocations. This must be the smallest DMA mask in the system, 151 * so a successful GFP_DMA allocation will always satisfy this. 152 */ 153 #ifndef ISA_DMA_THRESHOLD 154 #define ISA_DMA_THRESHOLD (0xffffffffULL) 155 #endif 156 157 #ifndef arch_adjust_zones 158 #define arch_adjust_zones(node,size,holes) do { } while (0) 159 #elif !defined(CONFIG_ZONE_DMA) 160 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" 161 #endif 162 163 /* 164 * PFNs are used to describe any physical page; this means 165 * PFN 0 == physical address 0. 166 * 167 * This is the PFN of the first RAM page in the kernel 168 * direct-mapped view. We assume this is the first page 169 * of RAM in the mem_map as well. 170 */ 171 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 172 173 /* 174 * These are *only* valid on the kernel direct mapped RAM memory. 175 * Note: Drivers should NOT use these. They are the wrong 176 * translation for translating DMA addresses. Use the driver 177 * DMA support - see dma-mapping.h. 178 */ 179 static inline unsigned long virt_to_phys(void *x) 180 { 181 return __virt_to_phys((unsigned long)(x)); 182 } 183 184 static inline void *phys_to_virt(unsigned long x) 185 { 186 return (void *)(__phys_to_virt((unsigned long)(x))); 187 } 188 189 /* 190 * Drivers should NOT use these either. 191 */ 192 #define __pa(x) __virt_to_phys((unsigned long)(x)) 193 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 194 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 195 196 /* 197 * Virtual <-> DMA view memory address translations 198 * Again, these are *only* valid on the kernel direct mapped RAM 199 * memory. Use of these is *deprecated* (and that doesn't mean 200 * use the __ prefixed forms instead.) See dma-mapping.h. 201 */ 202 #ifndef __virt_to_bus 203 #define __virt_to_bus __virt_to_phys 204 #define __bus_to_virt __phys_to_virt 205 #define __pfn_to_bus(x) __pfn_to_phys(x) 206 #define __bus_to_pfn(x) __phys_to_pfn(x) 207 #endif 208 209 static inline __deprecated unsigned long virt_to_bus(void *x) 210 { 211 return __virt_to_bus((unsigned long)x); 212 } 213 214 static inline __deprecated void *bus_to_virt(unsigned long x) 215 { 216 return (void *)__bus_to_virt(x); 217 } 218 219 /* 220 * Conversion between a struct page and a physical address. 221 * 222 * Note: when converting an unknown physical address to a 223 * struct page, the resulting pointer must be validated 224 * using VALID_PAGE(). It must return an invalid struct page 225 * for any physical address not corresponding to a system 226 * RAM address. 227 * 228 * page_to_pfn(page) convert a struct page * to a PFN number 229 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 230 * 231 * virt_to_page(k) convert a _valid_ virtual address to struct page * 232 * virt_addr_valid(k) indicates whether a virtual address is valid 233 */ 234 #ifndef CONFIG_DISCONTIGMEM 235 236 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 237 238 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 239 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 240 241 #define PHYS_TO_NID(addr) (0) 242 243 #else /* CONFIG_DISCONTIGMEM */ 244 245 /* 246 * This is more complex. We have a set of mem_map arrays spread 247 * around in memory. 248 */ 249 #include <linux/numa.h> 250 251 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn) 252 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT) 253 254 #define virt_to_page(kaddr) \ 255 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) 256 257 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) 258 259 /* 260 * Common discontigmem stuff. 261 * PHYS_TO_NID is used by the ARM kernel/setup.c 262 */ 263 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) 264 265 /* 266 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory 267 * and returns the mem_map of that node. 268 */ 269 #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr)) 270 271 /* 272 * Given a page frame number, find the owning node of the memory 273 * and returns the mem_map of that node. 274 */ 275 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) 276 277 #ifdef NODE_MEM_SIZE_BITS 278 #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1) 279 280 /* 281 * Given a kernel address, find the home node of the underlying memory. 282 */ 283 #define KVADDR_TO_NID(addr) \ 284 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS) 285 286 /* 287 * Given a page frame number, convert it to a node id. 288 */ 289 #define PFN_TO_NID(pfn) \ 290 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT)) 291 292 /* 293 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory 294 * and returns the index corresponding to the appropriate page in the 295 * node's mem_map. 296 */ 297 #define LOCAL_MAP_NR(addr) \ 298 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT) 299 300 #endif /* NODE_MEM_SIZE_BITS */ 301 302 #endif /* !CONFIG_DISCONTIGMEM */ 303 304 /* 305 * Optional coherency support. Currently used only by selected 306 * Intel XSC3-based systems. 307 */ 308 #ifndef arch_is_coherent 309 #define arch_is_coherent() 0 310 #endif 311 312 #endif 313 314 #include <asm-generic/memory_model.h> 315 316 #endif 317