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 #ifdef CONFIG_NEED_MACH_MEMORY_H 22 #include <mach/memory.h> 23 #endif 24 25 /* 26 * Allow for constants defined here to be used from assembly code 27 * by prepending the UL suffix only with actual C code compilation. 28 */ 29 #define UL(x) _AC(x, UL) 30 31 /* PAGE_OFFSET - the virtual address of the start of the kernel image */ 32 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 33 34 #ifdef CONFIG_MMU 35 36 /* 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 TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 41 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 42 43 /* 44 * The maximum size of a 26-bit user space task. 45 */ 46 #define TASK_SIZE_26 (UL(1) << 26) 47 48 /* 49 * The module space lives between the addresses given by TASK_SIZE 50 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 51 */ 52 #ifndef CONFIG_THUMB2_KERNEL 53 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 54 #else 55 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 56 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 57 #endif 58 59 #if TASK_SIZE > MODULES_VADDR 60 #error Top of user space clashes with start of module space 61 #endif 62 63 /* 64 * The highmem pkmap virtual space shares the end of the module area. 65 */ 66 #ifdef CONFIG_HIGHMEM 67 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 68 #else 69 #define MODULES_END (PAGE_OFFSET) 70 #endif 71 72 /* 73 * The XIP kernel gets mapped at the bottom of the module vm area. 74 * Since we use sections to map it, this macro replaces the physical address 75 * with its virtual address while keeping offset from the base section. 76 */ 77 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 78 79 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) 80 /* 81 * Allow 16MB-aligned ioremap pages 82 */ 83 #define IOREMAP_MAX_ORDER 24 84 #endif 85 86 #define VECTORS_BASE UL(0xffff0000) 87 88 #else /* CONFIG_MMU */ 89 90 #ifndef __ASSEMBLY__ 91 extern unsigned long vectors_base; 92 #define VECTORS_BASE vectors_base 93 #endif 94 95 /* 96 * The limitation of user task size can grow up to the end of free ram region. 97 * It is difficult to define and perhaps will never meet the original meaning 98 * of this define that was meant to. 99 * Fortunately, there is no reference for this in noMMU mode, for now. 100 */ 101 #define TASK_SIZE UL(0xffffffff) 102 103 #ifndef TASK_UNMAPPED_BASE 104 #define TASK_UNMAPPED_BASE UL(0x00000000) 105 #endif 106 107 #ifndef END_MEM 108 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 109 #endif 110 111 /* 112 * The module can be at any place in ram in nommu mode. 113 */ 114 #define MODULES_END (END_MEM) 115 #define MODULES_VADDR PAGE_OFFSET 116 117 #define XIP_VIRT_ADDR(physaddr) (physaddr) 118 119 #endif /* !CONFIG_MMU */ 120 121 #ifdef CONFIG_XIP_KERNEL 122 #define KERNEL_START _sdata 123 #else 124 #define KERNEL_START _stext 125 #endif 126 #define KERNEL_END _end 127 128 /* 129 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 130 * locations 131 */ 132 #ifdef CONFIG_HAVE_TCM 133 #define ITCM_OFFSET UL(0xfffe0000) 134 #define DTCM_OFFSET UL(0xfffe8000) 135 #endif 136 137 /* 138 * Convert a page to/from a physical address 139 */ 140 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 141 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 142 143 /* 144 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 145 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 146 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 147 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 148 */ 149 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 150 151 #ifdef CONFIG_XIP_KERNEL 152 /* 153 * When referencing data in RAM from the XIP region in a relative manner 154 * with the MMU off, we need the relative offset between the two physical 155 * addresses. The macro below achieves this, which is: 156 * __pa(v_data) - __xip_pa(v_text) 157 */ 158 #define PHYS_RELATIVE(v_data, v_text) \ 159 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \ 160 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \ 161 CONFIG_XIP_PHYS_ADDR)) 162 #else 163 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text)) 164 #endif 165 166 #ifndef __ASSEMBLY__ 167 168 /* 169 * Physical vs virtual RAM address space conversion. These are 170 * private definitions which should NOT be used outside memory.h 171 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 172 * 173 * PFNs are used to describe any physical page; this means 174 * PFN 0 == physical address 0. 175 */ 176 177 #if 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 __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_nodebug(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_nodebug(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 #endif 266 267 #define virt_to_pfn(kaddr) \ 268 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 269 PHYS_PFN_OFFSET) 270 271 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) 272 273 #ifdef CONFIG_DEBUG_VIRTUAL 274 extern phys_addr_t __virt_to_phys(unsigned long x); 275 extern phys_addr_t __phys_addr_symbol(unsigned long x); 276 #else 277 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 278 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 279 #endif 280 281 /* 282 * These are *only* valid on the kernel direct mapped RAM memory. 283 * Note: Drivers should NOT use these. They are the wrong 284 * translation for translating DMA addresses. Use the driver 285 * DMA support - see dma-mapping.h. 286 */ 287 #define virt_to_phys virt_to_phys 288 static inline phys_addr_t virt_to_phys(const volatile void *x) 289 { 290 return __virt_to_phys((unsigned long)(x)); 291 } 292 293 #define phys_to_virt phys_to_virt 294 static inline void *phys_to_virt(phys_addr_t x) 295 { 296 return (void *)__phys_to_virt(x); 297 } 298 299 /* 300 * Drivers should NOT use these either. 301 */ 302 #define __pa(x) __virt_to_phys((unsigned long)(x)) 303 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 304 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 305 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 306 307 extern long long arch_phys_to_idmap_offset; 308 309 /* 310 * These are for systems that have a hardware interconnect supported alias 311 * of physical memory for idmap purposes. Most cases should leave these 312 * untouched. Note: this can only return addresses less than 4GiB. 313 */ 314 static inline bool arm_has_idmap_alias(void) 315 { 316 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; 317 } 318 319 #define IDMAP_INVALID_ADDR ((u32)~0) 320 321 static inline unsigned long phys_to_idmap(phys_addr_t addr) 322 { 323 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { 324 addr += arch_phys_to_idmap_offset; 325 if (addr > (u32)~0) 326 addr = IDMAP_INVALID_ADDR; 327 } 328 return addr; 329 } 330 331 static inline phys_addr_t idmap_to_phys(unsigned long idmap) 332 { 333 phys_addr_t addr = idmap; 334 335 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) 336 addr -= arch_phys_to_idmap_offset; 337 338 return addr; 339 } 340 341 static inline unsigned long __virt_to_idmap(unsigned long x) 342 { 343 return phys_to_idmap(__virt_to_phys(x)); 344 } 345 346 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 347 348 /* 349 * Virtual <-> DMA view memory address translations 350 * Again, these are *only* valid on the kernel direct mapped RAM 351 * memory. Use of these is *deprecated* (and that doesn't mean 352 * use the __ prefixed forms instead.) See dma-mapping.h. 353 */ 354 #ifndef __virt_to_bus 355 #define __virt_to_bus __virt_to_phys 356 #define __bus_to_virt __phys_to_virt 357 #define __pfn_to_bus(x) __pfn_to_phys(x) 358 #define __bus_to_pfn(x) __phys_to_pfn(x) 359 #endif 360 361 /* 362 * Conversion between a struct page and a physical address. 363 * 364 * page_to_pfn(page) convert a struct page * to a PFN number 365 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 366 * 367 * virt_to_page(k) convert a _valid_ virtual address to struct page * 368 * virt_addr_valid(k) indicates whether a virtual address is valid 369 */ 370 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 371 372 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 373 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 374 && pfn_valid(virt_to_pfn(kaddr))) 375 376 #endif 377 378 #include <asm-generic/memory_model.h> 379 380 #endif 381