1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm/include/asm/memory.h 4 * 5 * Copyright (C) 2000-2002 Russell King 6 * modification for nommu, Hyok S. Choi, 2004 7 * 8 * Note: this file should not be included by non-asm/.h files 9 */ 10 #ifndef __ASM_ARM_MEMORY_H 11 #define __ASM_ARM_MEMORY_H 12 13 #include <linux/compiler.h> 14 #include <linux/const.h> 15 #include <linux/types.h> 16 #include <linux/sizes.h> 17 18 #ifdef CONFIG_NEED_MACH_MEMORY_H 19 #include <mach/memory.h> 20 #endif 21 #include <asm/kasan_def.h> 22 23 /* PAGE_OFFSET - the virtual address of the start of the kernel image */ 24 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 25 26 #ifdef CONFIG_MMU 27 28 /* 29 * TASK_SIZE - the maximum size of a user space task. 30 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 31 */ 32 #ifndef CONFIG_KASAN 33 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 34 #else 35 #define TASK_SIZE (KASAN_SHADOW_START) 36 #endif 37 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 38 39 /* 40 * The maximum size of a 26-bit user space task. 41 */ 42 #define TASK_SIZE_26 (UL(1) << 26) 43 44 /* 45 * The module space lives between the addresses given by TASK_SIZE 46 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 47 */ 48 #ifndef CONFIG_THUMB2_KERNEL 49 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 50 #else 51 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 52 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 53 #endif 54 55 #if TASK_SIZE > MODULES_VADDR 56 #error Top of user space clashes with start of module space 57 #endif 58 59 /* 60 * The highmem pkmap virtual space shares the end of the module area. 61 */ 62 #ifdef CONFIG_HIGHMEM 63 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 64 #else 65 #define MODULES_END (PAGE_OFFSET) 66 #endif 67 68 /* 69 * The XIP kernel gets mapped at the bottom of the module vm area. 70 * Since we use sections to map it, this macro replaces the physical address 71 * with its virtual address while keeping offset from the base section. 72 */ 73 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 74 75 #define FDT_FIXED_BASE UL(0xff800000) 76 #define FDT_FIXED_SIZE (2 * SECTION_SIZE) 77 #define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE)) 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 #define FDT_VIRT_BASE(physbase) ((void *)(physbase)) 120 121 #endif /* !CONFIG_MMU */ 122 123 #ifdef CONFIG_XIP_KERNEL 124 #define KERNEL_START _sdata 125 #else 126 #define KERNEL_START _stext 127 #endif 128 #define KERNEL_END _end 129 130 /* 131 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 132 * locations 133 */ 134 #ifdef CONFIG_HAVE_TCM 135 #define ITCM_OFFSET UL(0xfffe0000) 136 #define DTCM_OFFSET UL(0xfffe8000) 137 #endif 138 139 /* 140 * Convert a page to/from a physical address 141 */ 142 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 143 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 144 145 /* 146 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 147 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 148 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 149 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 150 */ 151 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 152 153 #ifndef __ASSEMBLY__ 154 155 /* 156 * Physical vs virtual RAM address space conversion. These are 157 * private definitions which should NOT be used outside memory.h 158 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 159 * 160 * PFNs are used to describe any physical page; this means 161 * PFN 0 == physical address 0. 162 */ 163 164 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT) 165 166 /* 167 * Constants used to force the right instruction encodings and shifts 168 * so that all we need to do is modify the 8-bit constant field. 169 */ 170 #define __PV_BITS_31_24 0x81000000 171 #define __PV_BITS_23_16 0x810000 172 #define __PV_BITS_7_0 0x81 173 174 extern unsigned long __pv_phys_pfn_offset; 175 extern u64 __pv_offset; 176 extern void fixup_pv_table(const void *, unsigned long); 177 extern const void *__pv_table_begin, *__pv_table_end; 178 179 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 180 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 181 182 #ifndef CONFIG_THUMB2_KERNEL 183 #define __pv_stub(from,to,instr) \ 184 __asm__("@ __pv_stub\n" \ 185 "1: " instr " %0, %1, %2\n" \ 186 "2: " instr " %0, %0, %3\n" \ 187 " .pushsection .pv_table,\"a\"\n" \ 188 " .long 1b - ., 2b - .\n" \ 189 " .popsection\n" \ 190 : "=r" (to) \ 191 : "r" (from), "I" (__PV_BITS_31_24), \ 192 "I"(__PV_BITS_23_16)) 193 194 #define __pv_add_carry_stub(x, y) \ 195 __asm__("@ __pv_add_carry_stub\n" \ 196 "0: movw %R0, #0\n" \ 197 " adds %Q0, %1, %R0, lsl #20\n" \ 198 "1: mov %R0, %2\n" \ 199 " adc %R0, %R0, #0\n" \ 200 " .pushsection .pv_table,\"a\"\n" \ 201 " .long 0b - ., 1b - .\n" \ 202 " .popsection\n" \ 203 : "=&r" (y) \ 204 : "r" (x), "I" (__PV_BITS_7_0) \ 205 : "cc") 206 207 #else 208 #define __pv_stub(from,to,instr) \ 209 __asm__("@ __pv_stub\n" \ 210 "0: movw %0, #0\n" \ 211 " lsl %0, #21\n" \ 212 " " instr " %0, %1, %0\n" \ 213 " .pushsection .pv_table,\"a\"\n" \ 214 " .long 0b - .\n" \ 215 " .popsection\n" \ 216 : "=&r" (to) \ 217 : "r" (from)) 218 219 #define __pv_add_carry_stub(x, y) \ 220 __asm__("@ __pv_add_carry_stub\n" \ 221 "0: movw %R0, #0\n" \ 222 " lsls %R0, #21\n" \ 223 " adds %Q0, %1, %R0\n" \ 224 "1: mvn %R0, #0\n" \ 225 " adc %R0, %R0, #0\n" \ 226 " .pushsection .pv_table,\"a\"\n" \ 227 " .long 0b - ., 1b - .\n" \ 228 " .popsection\n" \ 229 : "=&r" (y) \ 230 : "r" (x) \ 231 : "cc") 232 #endif 233 234 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 235 { 236 phys_addr_t t; 237 238 if (sizeof(phys_addr_t) == 4) { 239 __pv_stub(x, t, "add"); 240 } else { 241 __pv_add_carry_stub(x, t); 242 } 243 return t; 244 } 245 246 static inline unsigned long __phys_to_virt(phys_addr_t x) 247 { 248 unsigned long t; 249 250 /* 251 * 'unsigned long' cast discard upper word when 252 * phys_addr_t is 64 bit, and makes sure that inline 253 * assembler expression receives 32 bit argument 254 * in place where 'r' 32 bit operand is expected. 255 */ 256 __pv_stub((unsigned long) x, t, "sub"); 257 return t; 258 } 259 260 #else 261 262 #define PHYS_OFFSET PLAT_PHYS_OFFSET 263 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 264 265 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 266 { 267 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 268 } 269 270 static inline unsigned long __phys_to_virt(phys_addr_t x) 271 { 272 return x - PHYS_OFFSET + PAGE_OFFSET; 273 } 274 275 #endif 276 277 #define virt_to_pfn(kaddr) \ 278 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 279 PHYS_PFN_OFFSET) 280 281 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) 282 283 #ifdef CONFIG_DEBUG_VIRTUAL 284 extern phys_addr_t __virt_to_phys(unsigned long x); 285 extern phys_addr_t __phys_addr_symbol(unsigned long x); 286 #else 287 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 288 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 289 #endif 290 291 /* 292 * These are *only* valid on the kernel direct mapped RAM memory. 293 * Note: Drivers should NOT use these. They are the wrong 294 * translation for translating DMA addresses. Use the driver 295 * DMA support - see dma-mapping.h. 296 */ 297 #define virt_to_phys virt_to_phys 298 static inline phys_addr_t virt_to_phys(const volatile void *x) 299 { 300 return __virt_to_phys((unsigned long)(x)); 301 } 302 303 #define phys_to_virt phys_to_virt 304 static inline void *phys_to_virt(phys_addr_t x) 305 { 306 return (void *)__phys_to_virt(x); 307 } 308 309 /* 310 * Drivers should NOT use these either. 311 */ 312 #define __pa(x) __virt_to_phys((unsigned long)(x)) 313 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 314 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 315 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 316 317 extern long long arch_phys_to_idmap_offset; 318 319 /* 320 * These are for systems that have a hardware interconnect supported alias 321 * of physical memory for idmap purposes. Most cases should leave these 322 * untouched. Note: this can only return addresses less than 4GiB. 323 */ 324 static inline bool arm_has_idmap_alias(void) 325 { 326 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; 327 } 328 329 #define IDMAP_INVALID_ADDR ((u32)~0) 330 331 static inline unsigned long phys_to_idmap(phys_addr_t addr) 332 { 333 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { 334 addr += arch_phys_to_idmap_offset; 335 if (addr > (u32)~0) 336 addr = IDMAP_INVALID_ADDR; 337 } 338 return addr; 339 } 340 341 static inline phys_addr_t idmap_to_phys(unsigned long idmap) 342 { 343 phys_addr_t addr = idmap; 344 345 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) 346 addr -= arch_phys_to_idmap_offset; 347 348 return addr; 349 } 350 351 static inline unsigned long __virt_to_idmap(unsigned long x) 352 { 353 return phys_to_idmap(__virt_to_phys(x)); 354 } 355 356 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 357 358 /* 359 * Virtual <-> DMA view memory address translations 360 * Again, these are *only* valid on the kernel direct mapped RAM 361 * memory. Use of these is *deprecated* (and that doesn't mean 362 * use the __ prefixed forms instead.) See dma-mapping.h. 363 */ 364 #ifndef __virt_to_bus 365 #define __virt_to_bus __virt_to_phys 366 #define __bus_to_virt __phys_to_virt 367 #define __pfn_to_bus(x) __pfn_to_phys(x) 368 #define __bus_to_pfn(x) __phys_to_pfn(x) 369 #endif 370 371 /* 372 * Conversion between a struct page and a physical address. 373 * 374 * page_to_pfn(page) convert a struct page * to a PFN number 375 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 376 * 377 * virt_to_page(k) convert a _valid_ virtual address to struct page * 378 * virt_addr_valid(k) indicates whether a virtual address is valid 379 */ 380 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 381 382 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 383 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 384 && pfn_valid(virt_to_pfn(kaddr))) 385 386 #endif 387 388 #include <asm-generic/memory_model.h> 389 390 #endif 391