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