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 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) 48 #if TASK_SIZE > MODULES_VADDR 49 #error Top of user space clashes with start of module space 50 #endif 51 52 /* 53 * The highmem pkmap virtual space shares the end of the module area. 54 */ 55 #ifdef CONFIG_HIGHMEM 56 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 57 #else 58 #define MODULES_END (PAGE_OFFSET) 59 #endif 60 61 /* 62 * The XIP kernel gets mapped at the bottom of the module vm area. 63 * Since we use sections to map it, this macro replaces the physical address 64 * with its virtual address while keeping offset from the base section. 65 */ 66 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 67 68 /* 69 * Allow 16MB-aligned ioremap pages 70 */ 71 #define IOREMAP_MAX_ORDER 24 72 73 #else /* CONFIG_MMU */ 74 75 /* 76 * The limitation of user task size can grow up to the end of free ram region. 77 * It is difficult to define and perhaps will never meet the original meaning 78 * of this define that was meant to. 79 * Fortunately, there is no reference for this in noMMU mode, for now. 80 */ 81 #ifndef TASK_SIZE 82 #define TASK_SIZE (CONFIG_DRAM_SIZE) 83 #endif 84 85 #ifndef TASK_UNMAPPED_BASE 86 #define TASK_UNMAPPED_BASE UL(0x00000000) 87 #endif 88 89 #ifndef PHYS_OFFSET 90 #define PHYS_OFFSET (CONFIG_DRAM_BASE) 91 #endif 92 93 #ifndef END_MEM 94 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE) 95 #endif 96 97 #ifndef PAGE_OFFSET 98 #define PAGE_OFFSET (PHYS_OFFSET) 99 #endif 100 101 /* 102 * The module can be at any place in ram in nommu mode. 103 */ 104 #define MODULES_END (END_MEM) 105 #define MODULES_VADDR (PHYS_OFFSET) 106 107 #endif /* !CONFIG_MMU */ 108 109 /* 110 * Size of DMA-consistent memory region. Must be multiple of 2M, 111 * between 2MB and 14MB inclusive. 112 */ 113 #ifndef CONSISTENT_DMA_SIZE 114 #define CONSISTENT_DMA_SIZE SZ_2M 115 #endif 116 117 /* 118 * Physical vs virtual RAM address space conversion. These are 119 * private definitions which should NOT be used outside memory.h 120 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 121 */ 122 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 123 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 124 125 /* 126 * Convert a physical address to a Page Frame Number and back 127 */ 128 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) 129 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 130 131 #ifndef __ASSEMBLY__ 132 133 /* 134 * The DMA mask corresponding to the maximum bus address allocatable 135 * using GFP_DMA. The default here places no restriction on DMA 136 * allocations. This must be the smallest DMA mask in the system, 137 * so a successful GFP_DMA allocation will always satisfy this. 138 */ 139 #ifndef ISA_DMA_THRESHOLD 140 #define ISA_DMA_THRESHOLD (0xffffffffULL) 141 #endif 142 143 #ifndef arch_adjust_zones 144 #define arch_adjust_zones(node,size,holes) do { } while (0) 145 #elif !defined(CONFIG_ZONE_DMA) 146 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" 147 #endif 148 149 /* 150 * PFNs are used to describe any physical page; this means 151 * PFN 0 == physical address 0. 152 * 153 * This is the PFN of the first RAM page in the kernel 154 * direct-mapped view. We assume this is the first page 155 * of RAM in the mem_map as well. 156 */ 157 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 158 159 /* 160 * These are *only* valid on the kernel direct mapped RAM memory. 161 * Note: Drivers should NOT use these. They are the wrong 162 * translation for translating DMA addresses. Use the driver 163 * DMA support - see dma-mapping.h. 164 */ 165 static inline unsigned long virt_to_phys(void *x) 166 { 167 return __virt_to_phys((unsigned long)(x)); 168 } 169 170 static inline void *phys_to_virt(unsigned long x) 171 { 172 return (void *)(__phys_to_virt((unsigned long)(x))); 173 } 174 175 /* 176 * Drivers should NOT use these either. 177 */ 178 #define __pa(x) __virt_to_phys((unsigned long)(x)) 179 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 180 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 181 182 /* 183 * Virtual <-> DMA view memory address translations 184 * Again, these are *only* valid on the kernel direct mapped RAM 185 * memory. Use of these is *deprecated* (and that doesn't mean 186 * use the __ prefixed forms instead.) See dma-mapping.h. 187 */ 188 #ifndef __virt_to_bus 189 #define __virt_to_bus __virt_to_phys 190 #define __bus_to_virt __phys_to_virt 191 #define __pfn_to_bus(x) ((x) << PAGE_SHIFT) 192 #endif 193 194 static inline __deprecated unsigned long virt_to_bus(void *x) 195 { 196 return __virt_to_bus((unsigned long)x); 197 } 198 199 static inline __deprecated void *bus_to_virt(unsigned long x) 200 { 201 return (void *)__bus_to_virt(x); 202 } 203 204 /* 205 * Conversion between a struct page and a physical address. 206 * 207 * Note: when converting an unknown physical address to a 208 * struct page, the resulting pointer must be validated 209 * using VALID_PAGE(). It must return an invalid struct page 210 * for any physical address not corresponding to a system 211 * RAM address. 212 * 213 * page_to_pfn(page) convert a struct page * to a PFN number 214 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 215 * pfn_valid(pfn) indicates whether a PFN number is valid 216 * 217 * virt_to_page(k) convert a _valid_ virtual address to struct page * 218 * virt_addr_valid(k) indicates whether a virtual address is valid 219 */ 220 #ifndef CONFIG_DISCONTIGMEM 221 222 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 223 224 #ifndef CONFIG_SPARSEMEM 225 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 226 #endif 227 228 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 229 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 230 231 #define PHYS_TO_NID(addr) (0) 232 233 #else /* CONFIG_DISCONTIGMEM */ 234 235 /* 236 * This is more complex. We have a set of mem_map arrays spread 237 * around in memory. 238 */ 239 #include <linux/numa.h> 240 241 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn) 242 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT) 243 244 #define pfn_valid(pfn) \ 245 ({ \ 246 unsigned int nid = PFN_TO_NID(pfn); \ 247 int valid = nid < MAX_NUMNODES; \ 248 if (valid) { \ 249 pg_data_t *node = NODE_DATA(nid); \ 250 valid = (pfn - node->node_start_pfn) < \ 251 node->node_spanned_pages; \ 252 } \ 253 valid; \ 254 }) 255 256 #define virt_to_page(kaddr) \ 257 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) 258 259 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) 260 261 /* 262 * Common discontigmem stuff. 263 * PHYS_TO_NID is used by the ARM kernel/setup.c 264 */ 265 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) 266 267 /* 268 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory 269 * and returns the mem_map of that node. 270 */ 271 #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr)) 272 273 /* 274 * Given a page frame number, find the owning node of the memory 275 * and returns the mem_map of that node. 276 */ 277 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) 278 279 #ifdef NODE_MEM_SIZE_BITS 280 #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1) 281 282 /* 283 * Given a kernel address, find the home node of the underlying memory. 284 */ 285 #define KVADDR_TO_NID(addr) \ 286 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS) 287 288 /* 289 * Given a page frame number, convert it to a node id. 290 */ 291 #define PFN_TO_NID(pfn) \ 292 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT)) 293 294 /* 295 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory 296 * and returns the index corresponding to the appropriate page in the 297 * node's mem_map. 298 */ 299 #define LOCAL_MAP_NR(addr) \ 300 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT) 301 302 #endif /* NODE_MEM_SIZE_BITS */ 303 304 #endif /* !CONFIG_DISCONTIGMEM */ 305 306 /* 307 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. 308 */ 309 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 310 311 /* 312 * Optional coherency support. Currently used only by selected 313 * Intel XSC3-based systems. 314 */ 315 #ifndef arch_is_coherent 316 #define arch_is_coherent() 0 317 #endif 318 319 #endif 320 321 #include <asm-generic/memory_model.h> 322 323 #endif 324