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 setup_vectors_base(void); 92 extern unsigned long vectors_base; 93 #define VECTORS_BASE vectors_base 94 #endif 95 96 /* 97 * The limitation of user task size can grow up to the end of free ram region. 98 * It is difficult to define and perhaps will never meet the original meaning 99 * of this define that was meant to. 100 * Fortunately, there is no reference for this in noMMU mode, for now. 101 */ 102 #define TASK_SIZE UL(0xffffffff) 103 104 #ifndef TASK_UNMAPPED_BASE 105 #define TASK_UNMAPPED_BASE UL(0x00000000) 106 #endif 107 108 #ifndef END_MEM 109 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 110 #endif 111 112 /* 113 * The module can be at any place in ram in nommu mode. 114 */ 115 #define MODULES_END (END_MEM) 116 #define MODULES_VADDR PAGE_OFFSET 117 118 #define XIP_VIRT_ADDR(physaddr) (physaddr) 119 120 #endif /* !CONFIG_MMU */ 121 122 #ifdef CONFIG_XIP_KERNEL 123 #define KERNEL_START _sdata 124 #else 125 #define KERNEL_START _stext 126 #endif 127 #define KERNEL_END _end 128 129 /* 130 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 131 * locations 132 */ 133 #ifdef CONFIG_HAVE_TCM 134 #define ITCM_OFFSET UL(0xfffe0000) 135 #define DTCM_OFFSET UL(0xfffe8000) 136 #endif 137 138 /* 139 * Convert a page to/from a physical address 140 */ 141 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 142 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 143 144 /* 145 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 146 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 147 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 148 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 149 */ 150 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 151 152 #ifdef CONFIG_XIP_KERNEL 153 /* 154 * When referencing data in RAM from the XIP region in a relative manner 155 * with the MMU off, we need the relative offset between the two physical 156 * addresses. The macro below achieves this, which is: 157 * __pa(v_data) - __xip_pa(v_text) 158 */ 159 #define PHYS_RELATIVE(v_data, v_text) \ 160 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \ 161 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \ 162 CONFIG_XIP_PHYS_ADDR)) 163 #else 164 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text)) 165 #endif 166 167 #ifndef __ASSEMBLY__ 168 169 /* 170 * Physical vs virtual RAM address space conversion. These are 171 * private definitions which should NOT be used outside memory.h 172 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 173 * 174 * PFNs are used to describe any physical page; this means 175 * PFN 0 == physical address 0. 176 */ 177 178 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT) 179 180 /* 181 * Constants used to force the right instruction encodings and shifts 182 * so that all we need to do is modify the 8-bit constant field. 183 */ 184 #define __PV_BITS_31_24 0x81000000 185 #define __PV_BITS_7_0 0x81 186 187 extern unsigned long __pv_phys_pfn_offset; 188 extern u64 __pv_offset; 189 extern void fixup_pv_table(const void *, unsigned long); 190 extern const void *__pv_table_begin, *__pv_table_end; 191 192 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 193 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 194 195 #define __pv_stub(from,to,instr,type) \ 196 __asm__("@ __pv_stub\n" \ 197 "1: " instr " %0, %1, %2\n" \ 198 " .pushsection .pv_table,\"a\"\n" \ 199 " .long 1b\n" \ 200 " .popsection\n" \ 201 : "=r" (to) \ 202 : "r" (from), "I" (type)) 203 204 #define __pv_stub_mov_hi(t) \ 205 __asm__ volatile("@ __pv_stub_mov\n" \ 206 "1: mov %R0, %1\n" \ 207 " .pushsection .pv_table,\"a\"\n" \ 208 " .long 1b\n" \ 209 " .popsection\n" \ 210 : "=r" (t) \ 211 : "I" (__PV_BITS_7_0)) 212 213 #define __pv_add_carry_stub(x, y) \ 214 __asm__ volatile("@ __pv_add_carry_stub\n" \ 215 "1: adds %Q0, %1, %2\n" \ 216 " adc %R0, %R0, #0\n" \ 217 " .pushsection .pv_table,\"a\"\n" \ 218 " .long 1b\n" \ 219 " .popsection\n" \ 220 : "+r" (y) \ 221 : "r" (x), "I" (__PV_BITS_31_24) \ 222 : "cc") 223 224 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 225 { 226 phys_addr_t t; 227 228 if (sizeof(phys_addr_t) == 4) { 229 __pv_stub(x, t, "add", __PV_BITS_31_24); 230 } else { 231 __pv_stub_mov_hi(t); 232 __pv_add_carry_stub(x, t); 233 } 234 return t; 235 } 236 237 static inline unsigned long __phys_to_virt(phys_addr_t x) 238 { 239 unsigned long t; 240 241 /* 242 * 'unsigned long' cast discard upper word when 243 * phys_addr_t is 64 bit, and makes sure that inline 244 * assembler expression receives 32 bit argument 245 * in place where 'r' 32 bit operand is expected. 246 */ 247 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 248 return t; 249 } 250 251 #else 252 253 #define PHYS_OFFSET PLAT_PHYS_OFFSET 254 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 255 256 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 257 { 258 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 259 } 260 261 static inline unsigned long __phys_to_virt(phys_addr_t x) 262 { 263 return x - PHYS_OFFSET + PAGE_OFFSET; 264 } 265 266 #endif 267 268 #define virt_to_pfn(kaddr) \ 269 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 270 PHYS_PFN_OFFSET) 271 272 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) 273 274 #ifdef CONFIG_DEBUG_VIRTUAL 275 extern phys_addr_t __virt_to_phys(unsigned long x); 276 extern phys_addr_t __phys_addr_symbol(unsigned long x); 277 #else 278 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 279 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 280 #endif 281 282 /* 283 * These are *only* valid on the kernel direct mapped RAM memory. 284 * Note: Drivers should NOT use these. They are the wrong 285 * translation for translating DMA addresses. Use the driver 286 * DMA support - see dma-mapping.h. 287 */ 288 #define virt_to_phys virt_to_phys 289 static inline phys_addr_t virt_to_phys(const volatile void *x) 290 { 291 return __virt_to_phys((unsigned long)(x)); 292 } 293 294 #define phys_to_virt phys_to_virt 295 static inline void *phys_to_virt(phys_addr_t x) 296 { 297 return (void *)__phys_to_virt(x); 298 } 299 300 /* 301 * Drivers should NOT use these either. 302 */ 303 #define __pa(x) __virt_to_phys((unsigned long)(x)) 304 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 305 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 306 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 307 308 extern long long arch_phys_to_idmap_offset; 309 310 /* 311 * These are for systems that have a hardware interconnect supported alias 312 * of physical memory for idmap purposes. Most cases should leave these 313 * untouched. Note: this can only return addresses less than 4GiB. 314 */ 315 static inline bool arm_has_idmap_alias(void) 316 { 317 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; 318 } 319 320 #define IDMAP_INVALID_ADDR ((u32)~0) 321 322 static inline unsigned long phys_to_idmap(phys_addr_t addr) 323 { 324 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { 325 addr += arch_phys_to_idmap_offset; 326 if (addr > (u32)~0) 327 addr = IDMAP_INVALID_ADDR; 328 } 329 return addr; 330 } 331 332 static inline phys_addr_t idmap_to_phys(unsigned long idmap) 333 { 334 phys_addr_t addr = idmap; 335 336 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) 337 addr -= arch_phys_to_idmap_offset; 338 339 return addr; 340 } 341 342 static inline unsigned long __virt_to_idmap(unsigned long x) 343 { 344 return phys_to_idmap(__virt_to_phys(x)); 345 } 346 347 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 348 349 /* 350 * Virtual <-> DMA view memory address translations 351 * Again, these are *only* valid on the kernel direct mapped RAM 352 * memory. Use of these is *deprecated* (and that doesn't mean 353 * use the __ prefixed forms instead.) See dma-mapping.h. 354 */ 355 #ifndef __virt_to_bus 356 #define __virt_to_bus __virt_to_phys 357 #define __bus_to_virt __phys_to_virt 358 #define __pfn_to_bus(x) __pfn_to_phys(x) 359 #define __bus_to_pfn(x) __phys_to_pfn(x) 360 #endif 361 362 /* 363 * Conversion between a struct page and a physical address. 364 * 365 * page_to_pfn(page) convert a struct page * to a PFN number 366 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 367 * 368 * virt_to_page(k) convert a _valid_ virtual address to struct page * 369 * virt_addr_valid(k) indicates whether a virtual address is valid 370 */ 371 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 372 373 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 374 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 375 && pfn_valid(virt_to_pfn(kaddr))) 376 377 #endif 378 379 #include <asm-generic/memory_model.h> 380 381 #endif 382