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 <linux/sizes.h> 20 21 #include <asm/cache.h> 22 23 #ifdef CONFIG_NEED_MACH_MEMORY_H 24 #include <mach/memory.h> 25 #endif 26 27 /* 28 * Allow for constants defined here to be used from assembly code 29 * by prepending the UL suffix only with actual C code compilation. 30 */ 31 #define UL(x) _AC(x, UL) 32 33 #ifdef CONFIG_MMU 34 35 /* 36 * PAGE_OFFSET - the virtual address of the start of the kernel image 37 * TASK_SIZE - the maximum size of a user space task. 38 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 39 */ 40 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 41 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 42 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 43 44 /* 45 * The maximum size of a 26-bit user space task. 46 */ 47 #define TASK_SIZE_26 (UL(1) << 26) 48 49 /* 50 * The module space lives between the addresses given by TASK_SIZE 51 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 52 */ 53 #ifndef CONFIG_THUMB2_KERNEL 54 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 55 #else 56 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 57 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 58 #endif 59 60 #if TASK_SIZE > MODULES_VADDR 61 #error Top of user space clashes with start of module space 62 #endif 63 64 /* 65 * The highmem pkmap virtual space shares the end of the module area. 66 */ 67 #ifdef CONFIG_HIGHMEM 68 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 69 #else 70 #define MODULES_END (PAGE_OFFSET) 71 #endif 72 73 /* 74 * The XIP kernel gets mapped at the bottom of the module vm area. 75 * Since we use sections to map it, this macro replaces the physical address 76 * with its virtual address while keeping offset from the base section. 77 */ 78 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 79 80 /* 81 * Allow 16MB-aligned ioremap pages 82 */ 83 #define IOREMAP_MAX_ORDER 24 84 85 #define CONSISTENT_END (0xffe00000UL) 86 87 #else /* CONFIG_MMU */ 88 89 /* 90 * The limitation of user task size can grow up to the end of free ram region. 91 * It is difficult to define and perhaps will never meet the original meaning 92 * of this define that was meant to. 93 * Fortunately, there is no reference for this in noMMU mode, for now. 94 */ 95 #ifndef TASK_SIZE 96 #define TASK_SIZE (CONFIG_DRAM_SIZE) 97 #endif 98 99 #ifndef TASK_UNMAPPED_BASE 100 #define TASK_UNMAPPED_BASE UL(0x00000000) 101 #endif 102 103 #ifndef PHYS_OFFSET 104 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) 105 #endif 106 107 #ifndef END_MEM 108 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 109 #endif 110 111 #ifndef PAGE_OFFSET 112 #define PAGE_OFFSET (PHYS_OFFSET) 113 #endif 114 115 /* 116 * The module can be at any place in ram in nommu mode. 117 */ 118 #define MODULES_END (END_MEM) 119 #define MODULES_VADDR (PHYS_OFFSET) 120 121 #define XIP_VIRT_ADDR(physaddr) (physaddr) 122 123 #endif /* !CONFIG_MMU */ 124 125 /* 126 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 127 * locations 128 */ 129 #ifdef CONFIG_HAVE_TCM 130 #define ITCM_OFFSET UL(0xfffe0000) 131 #define DTCM_OFFSET UL(0xfffe8000) 132 #endif 133 134 /* 135 * Convert a physical address to a Page Frame Number and back 136 */ 137 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 138 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 139 140 /* 141 * Convert a page to/from a physical address 142 */ 143 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 144 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 145 146 /* 147 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed 148 * around in head.S and proc-*.S are shifted by this amount, in order to 149 * leave spare high bits for systems with physical address extension. This 150 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but 151 * gives us about 38-bits or so. 152 */ 153 #ifdef CONFIG_ARM_LPAE 154 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT 155 #else 156 #define ARCH_PGD_SHIFT 0 157 #endif 158 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) 159 160 #ifndef __ASSEMBLY__ 161 162 /* 163 * Physical vs virtual RAM address space conversion. These are 164 * private definitions which should NOT be used outside memory.h 165 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 166 */ 167 #ifndef __virt_to_phys 168 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT 169 170 /* 171 * Constants used to force the right instruction encodings and shifts 172 * so that all we need to do is modify the 8-bit constant field. 173 */ 174 #define __PV_BITS_31_24 0x81000000 175 #define __PV_BITS_7_0 0x81 176 177 extern u64 __pv_phys_offset; 178 extern u64 __pv_offset; 179 extern void fixup_pv_table(const void *, unsigned long); 180 extern const void *__pv_table_begin, *__pv_table_end; 181 182 #define PHYS_OFFSET __pv_phys_offset 183 184 #define __pv_stub(from,to,instr,type) \ 185 __asm__("@ __pv_stub\n" \ 186 "1: " instr " %0, %1, %2\n" \ 187 " .pushsection .pv_table,\"a\"\n" \ 188 " .long 1b\n" \ 189 " .popsection\n" \ 190 : "=r" (to) \ 191 : "r" (from), "I" (type)) 192 193 #define __pv_stub_mov_hi(t) \ 194 __asm__ volatile("@ __pv_stub_mov\n" \ 195 "1: mov %R0, %1\n" \ 196 " .pushsection .pv_table,\"a\"\n" \ 197 " .long 1b\n" \ 198 " .popsection\n" \ 199 : "=r" (t) \ 200 : "I" (__PV_BITS_7_0)) 201 202 #define __pv_add_carry_stub(x, y) \ 203 __asm__ volatile("@ __pv_add_carry_stub\n" \ 204 "1: adds %Q0, %1, %2\n" \ 205 " adc %R0, %R0, #0\n" \ 206 " .pushsection .pv_table,\"a\"\n" \ 207 " .long 1b\n" \ 208 " .popsection\n" \ 209 : "+r" (y) \ 210 : "r" (x), "I" (__PV_BITS_31_24) \ 211 : "cc") 212 213 static inline phys_addr_t __virt_to_phys(unsigned long x) 214 { 215 phys_addr_t t; 216 217 if (sizeof(phys_addr_t) == 4) { 218 __pv_stub(x, t, "add", __PV_BITS_31_24); 219 } else { 220 __pv_stub_mov_hi(t); 221 __pv_add_carry_stub(x, t); 222 } 223 return t; 224 } 225 226 static inline unsigned long __phys_to_virt(phys_addr_t x) 227 { 228 unsigned long t; 229 230 /* 231 * 'unsigned long' cast discard upper word when 232 * phys_addr_t is 64 bit, and makes sure that inline 233 * assembler expression receives 32 bit argument 234 * in place where 'r' 32 bit operand is expected. 235 */ 236 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 237 return t; 238 } 239 240 #else 241 242 static inline phys_addr_t __virt_to_phys(unsigned long x) 243 { 244 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 245 } 246 247 static inline unsigned long __phys_to_virt(phys_addr_t x) 248 { 249 return x - PHYS_OFFSET + PAGE_OFFSET; 250 } 251 252 #endif 253 #endif 254 #endif /* __ASSEMBLY__ */ 255 256 #ifndef PHYS_OFFSET 257 #ifdef PLAT_PHYS_OFFSET 258 #define PHYS_OFFSET PLAT_PHYS_OFFSET 259 #else 260 #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 261 #endif 262 #endif 263 264 #ifndef __ASSEMBLY__ 265 266 /* 267 * PFNs are used to describe any physical page; this means 268 * PFN 0 == physical address 0. 269 * 270 * This is the PFN of the first RAM page in the kernel 271 * direct-mapped view. We assume this is the first page 272 * of RAM in the mem_map as well. 273 */ 274 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 275 276 /* 277 * These are *only* valid on the kernel direct mapped RAM memory. 278 * Note: Drivers should NOT use these. They are the wrong 279 * translation for translating DMA addresses. Use the driver 280 * DMA support - see dma-mapping.h. 281 */ 282 static inline phys_addr_t virt_to_phys(const volatile void *x) 283 { 284 return __virt_to_phys((unsigned long)(x)); 285 } 286 287 static inline void *phys_to_virt(phys_addr_t x) 288 { 289 return (void *)__phys_to_virt(x); 290 } 291 292 /* 293 * Drivers should NOT use these either. 294 */ 295 #define __pa(x) __virt_to_phys((unsigned long)(x)) 296 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 297 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 298 299 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); 300 301 /* 302 * These are for systems that have a hardware interconnect supported alias of 303 * physical memory for idmap purposes. Most cases should leave these 304 * untouched. 305 */ 306 static inline phys_addr_t __virt_to_idmap(unsigned long x) 307 { 308 if (arch_virt_to_idmap) 309 return arch_virt_to_idmap(x); 310 else 311 return __virt_to_phys(x); 312 } 313 314 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 315 316 /* 317 * Virtual <-> DMA view memory address translations 318 * Again, these are *only* valid on the kernel direct mapped RAM 319 * memory. Use of these is *deprecated* (and that doesn't mean 320 * use the __ prefixed forms instead.) See dma-mapping.h. 321 */ 322 #ifndef __virt_to_bus 323 #define __virt_to_bus __virt_to_phys 324 #define __bus_to_virt __phys_to_virt 325 #define __pfn_to_bus(x) __pfn_to_phys(x) 326 #define __bus_to_pfn(x) __phys_to_pfn(x) 327 #endif 328 329 #ifdef CONFIG_VIRT_TO_BUS 330 static inline __deprecated unsigned long virt_to_bus(void *x) 331 { 332 return __virt_to_bus((unsigned long)x); 333 } 334 335 static inline __deprecated void *bus_to_virt(unsigned long x) 336 { 337 return (void *)__bus_to_virt(x); 338 } 339 #endif 340 341 /* 342 * Conversion between a struct page and a physical address. 343 * 344 * page_to_pfn(page) convert a struct page * to a PFN number 345 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 346 * 347 * virt_to_page(k) convert a _valid_ virtual address to struct page * 348 * virt_addr_valid(k) indicates whether a virtual address is valid 349 */ 350 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 351 352 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 353 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 354 355 #endif 356 357 #include <asm-generic/memory_model.h> 358 359 #endif 360