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 #define TASK_SIZE UL(0xffffffff) 95 96 #ifndef TASK_UNMAPPED_BASE 97 #define TASK_UNMAPPED_BASE UL(0x00000000) 98 #endif 99 100 #ifndef END_MEM 101 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 102 #endif 103 104 /* 105 * The module can be at any place in ram in nommu mode. 106 */ 107 #define MODULES_END (END_MEM) 108 #define MODULES_VADDR PAGE_OFFSET 109 110 #define XIP_VIRT_ADDR(physaddr) (physaddr) 111 112 #endif /* !CONFIG_MMU */ 113 114 /* 115 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 116 * locations 117 */ 118 #ifdef CONFIG_HAVE_TCM 119 #define ITCM_OFFSET UL(0xfffe0000) 120 #define DTCM_OFFSET UL(0xfffe8000) 121 #endif 122 123 /* 124 * Convert a physical address to a Page Frame Number and back 125 */ 126 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 127 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 128 129 /* 130 * Convert a page to/from a physical address 131 */ 132 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 133 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 134 135 /* 136 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed 137 * around in head.S and proc-*.S are shifted by this amount, in order to 138 * leave spare high bits for systems with physical address extension. This 139 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but 140 * gives us about 38-bits or so. 141 */ 142 #ifdef CONFIG_ARM_LPAE 143 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT 144 #else 145 #define ARCH_PGD_SHIFT 0 146 #endif 147 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) 148 149 /* 150 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 151 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 152 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 153 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 154 */ 155 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 156 157 #ifndef __ASSEMBLY__ 158 159 /* 160 * Physical vs virtual RAM address space conversion. These are 161 * private definitions which should NOT be used outside memory.h 162 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 163 * 164 * PFNs are used to describe any physical page; this means 165 * PFN 0 == physical address 0. 166 */ 167 #if defined(__virt_to_phys) 168 #define PHYS_OFFSET PLAT_PHYS_OFFSET 169 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 170 171 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 172 173 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT) 174 175 /* 176 * Constants used to force the right instruction encodings and shifts 177 * so that all we need to do is modify the 8-bit constant field. 178 */ 179 #define __PV_BITS_31_24 0x81000000 180 #define __PV_BITS_7_0 0x81 181 182 extern unsigned long __pv_phys_pfn_offset; 183 extern u64 __pv_offset; 184 extern void fixup_pv_table(const void *, unsigned long); 185 extern const void *__pv_table_begin, *__pv_table_end; 186 187 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 188 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 189 190 #define virt_to_pfn(kaddr) \ 191 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 192 PHYS_PFN_OFFSET) 193 194 #define __pv_stub(from,to,instr,type) \ 195 __asm__("@ __pv_stub\n" \ 196 "1: " instr " %0, %1, %2\n" \ 197 " .pushsection .pv_table,\"a\"\n" \ 198 " .long 1b\n" \ 199 " .popsection\n" \ 200 : "=r" (to) \ 201 : "r" (from), "I" (type)) 202 203 #define __pv_stub_mov_hi(t) \ 204 __asm__ volatile("@ __pv_stub_mov\n" \ 205 "1: mov %R0, %1\n" \ 206 " .pushsection .pv_table,\"a\"\n" \ 207 " .long 1b\n" \ 208 " .popsection\n" \ 209 : "=r" (t) \ 210 : "I" (__PV_BITS_7_0)) 211 212 #define __pv_add_carry_stub(x, y) \ 213 __asm__ volatile("@ __pv_add_carry_stub\n" \ 214 "1: adds %Q0, %1, %2\n" \ 215 " adc %R0, %R0, #0\n" \ 216 " .pushsection .pv_table,\"a\"\n" \ 217 " .long 1b\n" \ 218 " .popsection\n" \ 219 : "+r" (y) \ 220 : "r" (x), "I" (__PV_BITS_31_24) \ 221 : "cc") 222 223 static inline phys_addr_t __virt_to_phys(unsigned long x) 224 { 225 phys_addr_t t; 226 227 if (sizeof(phys_addr_t) == 4) { 228 __pv_stub(x, t, "add", __PV_BITS_31_24); 229 } else { 230 __pv_stub_mov_hi(t); 231 __pv_add_carry_stub(x, t); 232 } 233 return t; 234 } 235 236 static inline unsigned long __phys_to_virt(phys_addr_t x) 237 { 238 unsigned long t; 239 240 /* 241 * 'unsigned long' cast discard upper word when 242 * phys_addr_t is 64 bit, and makes sure that inline 243 * assembler expression receives 32 bit argument 244 * in place where 'r' 32 bit operand is expected. 245 */ 246 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 247 return t; 248 } 249 250 #else 251 252 #define PHYS_OFFSET PLAT_PHYS_OFFSET 253 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 254 255 static inline phys_addr_t __virt_to_phys(unsigned long x) 256 { 257 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 258 } 259 260 static inline unsigned long __phys_to_virt(phys_addr_t x) 261 { 262 return x - PHYS_OFFSET + PAGE_OFFSET; 263 } 264 265 #define virt_to_pfn(kaddr) \ 266 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 267 PHYS_PFN_OFFSET) 268 269 #endif 270 271 /* 272 * These are *only* valid on the kernel direct mapped RAM memory. 273 * Note: Drivers should NOT use these. They are the wrong 274 * translation for translating DMA addresses. Use the driver 275 * DMA support - see dma-mapping.h. 276 */ 277 #define virt_to_phys virt_to_phys 278 static inline phys_addr_t virt_to_phys(const volatile void *x) 279 { 280 return __virt_to_phys((unsigned long)(x)); 281 } 282 283 #define phys_to_virt phys_to_virt 284 static inline void *phys_to_virt(phys_addr_t x) 285 { 286 return (void *)__phys_to_virt(x); 287 } 288 289 /* 290 * Drivers should NOT use these either. 291 */ 292 #define __pa(x) __virt_to_phys((unsigned long)(x)) 293 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 294 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 295 296 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); 297 298 /* 299 * These are for systems that have a hardware interconnect supported alias of 300 * physical memory for idmap purposes. Most cases should leave these 301 * untouched. 302 */ 303 static inline phys_addr_t __virt_to_idmap(unsigned long x) 304 { 305 if (arch_virt_to_idmap) 306 return arch_virt_to_idmap(x); 307 else 308 return __virt_to_phys(x); 309 } 310 311 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 312 313 /* 314 * Virtual <-> DMA view memory address translations 315 * Again, these are *only* valid on the kernel direct mapped RAM 316 * memory. Use of these is *deprecated* (and that doesn't mean 317 * use the __ prefixed forms instead.) See dma-mapping.h. 318 */ 319 #ifndef __virt_to_bus 320 #define __virt_to_bus __virt_to_phys 321 #define __bus_to_virt __phys_to_virt 322 #define __pfn_to_bus(x) __pfn_to_phys(x) 323 #define __bus_to_pfn(x) __phys_to_pfn(x) 324 #endif 325 326 #ifdef CONFIG_VIRT_TO_BUS 327 #define virt_to_bus virt_to_bus 328 static inline __deprecated unsigned long virt_to_bus(void *x) 329 { 330 return __virt_to_bus((unsigned long)x); 331 } 332 333 #define bus_to_virt bus_to_virt 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