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 <linux/types.h> 19 #include <mach/memory.h> 20 #include <asm/sizes.h> 21 22 /* 23 * Allow for constants defined here to be used from assembly code 24 * by prepending the UL suffix only with actual C code compilation. 25 */ 26 #define UL(x) _AC(x, UL) 27 28 #ifdef CONFIG_MMU 29 30 /* 31 * PAGE_OFFSET - the virtual address of the start of the kernel image 32 * TASK_SIZE - the maximum size of a user space task. 33 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 34 */ 35 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 36 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) 37 #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) 38 39 /* 40 * The maximum size of a 26-bit user space task. 41 */ 42 #define TASK_SIZE_26 UL(0x04000000) 43 44 /* 45 * The module space lives between the addresses given by TASK_SIZE 46 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 47 */ 48 #ifndef CONFIG_THUMB2_KERNEL 49 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) 50 #else 51 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 52 #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) 53 #endif 54 55 #if TASK_SIZE > MODULES_VADDR 56 #error Top of user space clashes with start of module space 57 #endif 58 59 /* 60 * The highmem pkmap virtual space shares the end of the module area. 61 */ 62 #ifdef CONFIG_HIGHMEM 63 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 64 #else 65 #define MODULES_END (PAGE_OFFSET) 66 #endif 67 68 /* 69 * The XIP kernel gets mapped at the bottom of the module vm area. 70 * Since we use sections to map it, this macro replaces the physical address 71 * with its virtual address while keeping offset from the base section. 72 */ 73 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 74 75 /* 76 * Allow 16MB-aligned ioremap pages 77 */ 78 #define IOREMAP_MAX_ORDER 24 79 80 /* 81 * Size of DMA-consistent memory region. Must be multiple of 2M, 82 * between 2MB and 14MB inclusive. 83 */ 84 #ifndef CONSISTENT_DMA_SIZE 85 #define CONSISTENT_DMA_SIZE SZ_2M 86 #endif 87 88 #define CONSISTENT_END (0xffe00000UL) 89 #define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE) 90 91 #else /* CONFIG_MMU */ 92 93 /* 94 * The limitation of user task size can grow up to the end of free ram region. 95 * It is difficult to define and perhaps will never meet the original meaning 96 * of this define that was meant to. 97 * Fortunately, there is no reference for this in noMMU mode, for now. 98 */ 99 #ifndef TASK_SIZE 100 #define TASK_SIZE (CONFIG_DRAM_SIZE) 101 #endif 102 103 #ifndef TASK_UNMAPPED_BASE 104 #define TASK_UNMAPPED_BASE UL(0x00000000) 105 #endif 106 107 #ifndef PHYS_OFFSET 108 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) 109 #endif 110 111 #ifndef END_MEM 112 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 113 #endif 114 115 #ifndef PAGE_OFFSET 116 #define PAGE_OFFSET (PHYS_OFFSET) 117 #endif 118 119 /* 120 * The module can be at any place in ram in nommu mode. 121 */ 122 #define MODULES_END (END_MEM) 123 #define MODULES_VADDR (PHYS_OFFSET) 124 125 #endif /* !CONFIG_MMU */ 126 127 /* 128 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 129 * locations 130 */ 131 #ifdef CONFIG_HAVE_TCM 132 #define ITCM_OFFSET UL(0xfffe0000) 133 #define DTCM_OFFSET UL(0xfffe8000) 134 #endif 135 136 /* 137 * Convert a physical address to a Page Frame Number and back 138 */ 139 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 140 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 141 142 /* 143 * Convert a page to/from a physical address 144 */ 145 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 146 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 147 148 #ifndef __ASSEMBLY__ 149 150 /* 151 * Physical vs virtual RAM address space conversion. These are 152 * private definitions which should NOT be used outside memory.h 153 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 154 */ 155 #ifndef __virt_to_phys 156 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT 157 158 /* 159 * Constants used to force the right instruction encodings and shifts 160 * so that all we need to do is modify the 8-bit constant field. 161 */ 162 #define __PV_BITS_31_24 0x81000000 163 #define __PV_BITS_23_16 0x00810000 164 165 extern unsigned long __pv_phys_offset; 166 #define PHYS_OFFSET __pv_phys_offset 167 168 #define __pv_stub(from,to,instr,type) \ 169 __asm__("@ __pv_stub\n" \ 170 "1: " instr " %0, %1, %2\n" \ 171 " .pushsection .pv_table,\"a\"\n" \ 172 " .long 1b\n" \ 173 " .popsection\n" \ 174 : "=r" (to) \ 175 : "r" (from), "I" (type)) 176 177 static inline unsigned long __virt_to_phys(unsigned long x) 178 { 179 unsigned long t; 180 __pv_stub(x, t, "add", __PV_BITS_31_24); 181 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT 182 __pv_stub(t, t, "add", __PV_BITS_23_16); 183 #endif 184 return t; 185 } 186 187 static inline unsigned long __phys_to_virt(unsigned long x) 188 { 189 unsigned long t; 190 __pv_stub(x, t, "sub", __PV_BITS_31_24); 191 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT 192 __pv_stub(t, t, "sub", __PV_BITS_23_16); 193 #endif 194 return t; 195 } 196 #else 197 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 198 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 199 #endif 200 #endif 201 202 #ifndef PHYS_OFFSET 203 #define PHYS_OFFSET PLAT_PHYS_OFFSET 204 #endif 205 206 /* 207 * The DMA mask corresponding to the maximum bus address allocatable 208 * using GFP_DMA. The default here places no restriction on DMA 209 * allocations. This must be the smallest DMA mask in the system, 210 * so a successful GFP_DMA allocation will always satisfy this. 211 */ 212 #ifndef ARM_DMA_ZONE_SIZE 213 #define ISA_DMA_THRESHOLD (0xffffffffULL) 214 #else 215 #define ISA_DMA_THRESHOLD (PHYS_OFFSET + ARM_DMA_ZONE_SIZE - 1) 216 #endif 217 218 /* 219 * PFNs are used to describe any physical page; this means 220 * PFN 0 == physical address 0. 221 * 222 * This is the PFN of the first RAM page in the kernel 223 * direct-mapped view. We assume this is the first page 224 * of RAM in the mem_map as well. 225 */ 226 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 227 228 /* 229 * These are *only* valid on the kernel direct mapped RAM memory. 230 * Note: Drivers should NOT use these. They are the wrong 231 * translation for translating DMA addresses. Use the driver 232 * DMA support - see dma-mapping.h. 233 */ 234 static inline phys_addr_t virt_to_phys(const volatile void *x) 235 { 236 return __virt_to_phys((unsigned long)(x)); 237 } 238 239 static inline void *phys_to_virt(phys_addr_t x) 240 { 241 return (void *)(__phys_to_virt((unsigned long)(x))); 242 } 243 244 /* 245 * Drivers should NOT use these either. 246 */ 247 #define __pa(x) __virt_to_phys((unsigned long)(x)) 248 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 249 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 250 251 /* 252 * Virtual <-> DMA view memory address translations 253 * Again, these are *only* valid on the kernel direct mapped RAM 254 * memory. Use of these is *deprecated* (and that doesn't mean 255 * use the __ prefixed forms instead.) See dma-mapping.h. 256 */ 257 #ifndef __virt_to_bus 258 #define __virt_to_bus __virt_to_phys 259 #define __bus_to_virt __phys_to_virt 260 #define __pfn_to_bus(x) __pfn_to_phys(x) 261 #define __bus_to_pfn(x) __phys_to_pfn(x) 262 #endif 263 264 static inline __deprecated unsigned long virt_to_bus(void *x) 265 { 266 return __virt_to_bus((unsigned long)x); 267 } 268 269 static inline __deprecated void *bus_to_virt(unsigned long x) 270 { 271 return (void *)__bus_to_virt(x); 272 } 273 274 /* 275 * Conversion between a struct page and a physical address. 276 * 277 * Note: when converting an unknown physical address to a 278 * struct page, the resulting pointer must be validated 279 * using VALID_PAGE(). It must return an invalid struct page 280 * for any physical address not corresponding to a system 281 * RAM address. 282 * 283 * page_to_pfn(page) convert a struct page * to a PFN number 284 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 285 * 286 * virt_to_page(k) convert a _valid_ virtual address to struct page * 287 * virt_addr_valid(k) indicates whether a virtual address is valid 288 */ 289 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 290 291 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 292 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 293 294 /* 295 * Optional coherency support. Currently used only by selected 296 * Intel XSC3-based systems. 297 */ 298 #ifndef arch_is_coherent 299 #define arch_is_coherent() 0 300 #endif 301 302 #endif 303 304 #include <asm-generic/memory_model.h> 305 306 #endif 307