1 /* 2 * linux/include/asm-arm/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 /* 17 * Allow for constants defined here to be used from assembly code 18 * by prepending the UL suffix only with actual C code compilation. 19 */ 20 #ifndef __ASSEMBLY__ 21 #define UL(x) (x##UL) 22 #else 23 #define UL(x) (x) 24 #endif 25 26 #include <linux/compiler.h> 27 #include <asm/arch/memory.h> 28 #include <asm/sizes.h> 29 30 #ifdef CONFIG_MMU 31 32 #ifndef TASK_SIZE 33 /* 34 * TASK_SIZE - the maximum size of a user space task. 35 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 36 */ 37 #define TASK_SIZE UL(0xbf000000) 38 #define TASK_UNMAPPED_BASE UL(0x40000000) 39 #endif 40 41 /* 42 * The maximum size of a 26-bit user space task. 43 */ 44 #define TASK_SIZE_26 UL(0x04000000) 45 46 /* 47 * Page offset: 3GB 48 */ 49 #ifndef PAGE_OFFSET 50 #define PAGE_OFFSET UL(0xc0000000) 51 #endif 52 53 /* 54 * The module space lives between the addresses given by TASK_SIZE 55 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 56 */ 57 #define MODULE_END (PAGE_OFFSET) 58 #define MODULE_START (MODULE_END - 16*1048576) 59 60 #if TASK_SIZE > MODULE_START 61 #error Top of user space clashes with start of module space 62 #endif 63 64 /* 65 * The XIP kernel gets mapped at the bottom of the module vm area. 66 * Since we use sections to map it, this macro replaces the physical address 67 * with its virtual address while keeping offset from the base section. 68 */ 69 #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff)) 70 71 /* 72 * Allow 16MB-aligned ioremap pages 73 */ 74 #define IOREMAP_MAX_ORDER 24 75 76 #else /* CONFIG_MMU */ 77 78 /* 79 * The limitation of user task size can grow up to the end of free ram region. 80 * It is difficult to define and perhaps will never meet the original meaning 81 * of this define that was meant to. 82 * Fortunately, there is no reference for this in noMMU mode, for now. 83 */ 84 #ifndef TASK_SIZE 85 #define TASK_SIZE (CONFIG_DRAM_SIZE) 86 #endif 87 88 #ifndef TASK_UNMAPPED_BASE 89 #define TASK_UNMAPPED_BASE UL(0x00000000) 90 #endif 91 92 #ifndef PHYS_OFFSET 93 #define PHYS_OFFSET (CONFIG_DRAM_BASE) 94 #endif 95 96 #ifndef END_MEM 97 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE) 98 #endif 99 100 #ifndef PAGE_OFFSET 101 #define PAGE_OFFSET (PHYS_OFFSET) 102 #endif 103 104 /* 105 * The module can be at any place in ram in nommu mode. 106 */ 107 #define MODULE_END (END_MEM) 108 #define MODULE_START (PHYS_OFFSET) 109 110 #endif /* !CONFIG_MMU */ 111 112 /* 113 * Size of DMA-consistent memory region. Must be multiple of 2M, 114 * between 2MB and 14MB inclusive. 115 */ 116 #ifndef CONSISTENT_DMA_SIZE 117 #define CONSISTENT_DMA_SIZE SZ_2M 118 #endif 119 120 /* 121 * Physical vs virtual RAM address space conversion. These are 122 * private definitions which should NOT be used outside memory.h 123 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 124 */ 125 #ifndef __virt_to_phys 126 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 127 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 128 #endif 129 130 /* 131 * Convert a physical address to a Page Frame Number and back 132 */ 133 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) 134 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 135 136 #ifndef __ASSEMBLY__ 137 138 /* 139 * The DMA mask corresponding to the maximum bus address allocatable 140 * using GFP_DMA. The default here places no restriction on DMA 141 * allocations. This must be the smallest DMA mask in the system, 142 * so a successful GFP_DMA allocation will always satisfy this. 143 */ 144 #ifndef ISA_DMA_THRESHOLD 145 #define ISA_DMA_THRESHOLD (0xffffffffULL) 146 #endif 147 148 #ifndef arch_adjust_zones 149 #define arch_adjust_zones(node,size,holes) do { } while (0) 150 #endif 151 152 /* 153 * PFNs are used to describe any physical page; this means 154 * PFN 0 == physical address 0. 155 * 156 * This is the PFN of the first RAM page in the kernel 157 * direct-mapped view. We assume this is the first page 158 * of RAM in the mem_map as well. 159 */ 160 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 161 162 /* 163 * These are *only* valid on the kernel direct mapped RAM memory. 164 * Note: Drivers should NOT use these. They are the wrong 165 * translation for translating DMA addresses. Use the driver 166 * DMA support - see dma-mapping.h. 167 */ 168 static inline unsigned long virt_to_phys(void *x) 169 { 170 return __virt_to_phys((unsigned long)(x)); 171 } 172 173 static inline void *phys_to_virt(unsigned long x) 174 { 175 return (void *)(__phys_to_virt((unsigned long)(x))); 176 } 177 178 /* 179 * Drivers should NOT use these either. 180 */ 181 #define __pa(x) __virt_to_phys((unsigned long)(x)) 182 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 183 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 184 185 /* 186 * Virtual <-> DMA view memory address translations 187 * Again, these are *only* valid on the kernel direct mapped RAM 188 * memory. Use of these is *deprecated* (and that doesn't mean 189 * use the __ prefixed forms instead.) See dma-mapping.h. 190 */ 191 static inline __deprecated unsigned long virt_to_bus(void *x) 192 { 193 return __virt_to_bus((unsigned long)x); 194 } 195 196 static inline __deprecated void *bus_to_virt(unsigned long x) 197 { 198 return (void *)__bus_to_virt(x); 199 } 200 201 /* 202 * Conversion between a struct page and a physical address. 203 * 204 * Note: when converting an unknown physical address to a 205 * struct page, the resulting pointer must be validated 206 * using VALID_PAGE(). It must return an invalid struct page 207 * for any physical address not corresponding to a system 208 * RAM address. 209 * 210 * page_to_pfn(page) convert a struct page * to a PFN number 211 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 212 * pfn_valid(pfn) indicates whether a PFN number is valid 213 * 214 * virt_to_page(k) convert a _valid_ virtual address to struct page * 215 * virt_addr_valid(k) indicates whether a virtual address is valid 216 */ 217 #ifndef CONFIG_DISCONTIGMEM 218 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 219 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 220 221 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 222 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 223 224 #define PHYS_TO_NID(addr) (0) 225 226 #else /* CONFIG_DISCONTIGMEM */ 227 228 /* 229 * This is more complex. We have a set of mem_map arrays spread 230 * around in memory. 231 */ 232 #include <linux/numa.h> 233 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn) 234 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT) 235 236 #define pfn_valid(pfn) \ 237 ({ \ 238 unsigned int nid = PFN_TO_NID(pfn); \ 239 int valid = nid < MAX_NUMNODES; \ 240 if (valid) { \ 241 pg_data_t *node = NODE_DATA(nid); \ 242 valid = (pfn - node->node_start_pfn) < \ 243 node->node_spanned_pages; \ 244 } \ 245 valid; \ 246 }) 247 248 #define virt_to_page(kaddr) \ 249 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) 250 251 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) 252 253 /* 254 * Common discontigmem stuff. 255 * PHYS_TO_NID is used by the ARM kernel/setup.c 256 */ 257 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) 258 259 #endif /* !CONFIG_DISCONTIGMEM */ 260 261 /* 262 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. 263 */ 264 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 265 266 /* 267 * Optional device DMA address remapping. Do _not_ use directly! 268 * We should really eliminate virt_to_bus() here - it's deprecated. 269 */ 270 #ifndef __arch_page_to_dma 271 #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page))) 272 #define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr)) 273 #define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr))) 274 #else 275 #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page)) 276 #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr)) 277 #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr)) 278 #endif 279 280 /* 281 * Optional coherency support. Currently used only by selected 282 * Intel XSC3-based systems. 283 */ 284 #ifndef arch_is_coherent 285 #define arch_is_coherent() 0 286 #endif 287 288 #endif 289 290 #include <asm-generic/memory_model.h> 291 292 #endif 293
