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 /* 24 * PAGE_OFFSET: the virtual address of the start of lowmem, memory above 25 * the virtual address range for userspace. 26 * KERNEL_OFFSET: the virtual address of the start of the kernel image. 27 * we may further offset this with TEXT_OFFSET in practice. 28 */ 29 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 30 #define KERNEL_OFFSET (PAGE_OFFSET) 31 32 #ifdef CONFIG_MMU 33 34 /* 35 * TASK_SIZE - the maximum size of a user space task. 36 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 37 */ 38 #ifndef CONFIG_KASAN 39 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 40 #else 41 #define TASK_SIZE (KASAN_SHADOW_START) 42 #endif 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 #define FDT_FIXED_BASE UL(0xff800000) 82 #define FDT_FIXED_SIZE (2 * SECTION_SIZE) 83 #define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE)) 84 85 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) 86 /* 87 * Allow 16MB-aligned ioremap pages 88 */ 89 #define IOREMAP_MAX_ORDER 24 90 #endif 91 92 #define VECTORS_BASE UL(0xffff0000) 93 94 #else /* CONFIG_MMU */ 95 96 #ifndef __ASSEMBLY__ 97 extern unsigned long setup_vectors_base(void); 98 extern unsigned long vectors_base; 99 #define VECTORS_BASE vectors_base 100 #endif 101 102 /* 103 * The limitation of user task size can grow up to the end of free ram region. 104 * It is difficult to define and perhaps will never meet the original meaning 105 * of this define that was meant to. 106 * Fortunately, there is no reference for this in noMMU mode, for now. 107 */ 108 #define TASK_SIZE UL(0xffffffff) 109 110 #ifndef TASK_UNMAPPED_BASE 111 #define TASK_UNMAPPED_BASE UL(0x00000000) 112 #endif 113 114 #ifndef END_MEM 115 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 116 #endif 117 118 /* 119 * The module can be at any place in ram in nommu mode. 120 */ 121 #define MODULES_END (END_MEM) 122 #define MODULES_VADDR PAGE_OFFSET 123 124 #define XIP_VIRT_ADDR(physaddr) (physaddr) 125 #define FDT_VIRT_BASE(physbase) ((void *)(physbase)) 126 127 #endif /* !CONFIG_MMU */ 128 129 #ifdef CONFIG_XIP_KERNEL 130 #define KERNEL_START _sdata 131 #else 132 #define KERNEL_START _stext 133 #endif 134 #define KERNEL_END _end 135 136 /* 137 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 138 * locations 139 */ 140 #ifdef CONFIG_HAVE_TCM 141 #define ITCM_OFFSET UL(0xfffe0000) 142 #define DTCM_OFFSET UL(0xfffe8000) 143 #endif 144 145 /* 146 * Convert a page to/from a physical address 147 */ 148 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 149 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 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, and on platforms that don't 154 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 155 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 156 */ 157 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 158 159 #ifndef __ASSEMBLY__ 160 161 /* 162 * Physical start and end address of the kernel sections. These addresses are 163 * 2MB-aligned to match the section mappings placed over the kernel. We use 164 * u64 so that LPAE mappings beyond the 32bit limit will work out as well. 165 */ 166 extern u64 kernel_sec_start; 167 extern u64 kernel_sec_end; 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_23_16 0x810000 186 #define __PV_BITS_7_0 0x81 187 188 extern unsigned long __pv_phys_pfn_offset; 189 extern u64 __pv_offset; 190 extern void fixup_pv_table(const void *, unsigned long); 191 extern const void *__pv_table_begin, *__pv_table_end; 192 193 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 194 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 195 196 #ifndef CONFIG_THUMB2_KERNEL 197 #define __pv_stub(from,to,instr) \ 198 __asm__("@ __pv_stub\n" \ 199 "1: " instr " %0, %1, %2\n" \ 200 "2: " instr " %0, %0, %3\n" \ 201 " .pushsection .pv_table,\"a\"\n" \ 202 " .long 1b - ., 2b - .\n" \ 203 " .popsection\n" \ 204 : "=r" (to) \ 205 : "r" (from), "I" (__PV_BITS_31_24), \ 206 "I"(__PV_BITS_23_16)) 207 208 #define __pv_add_carry_stub(x, y) \ 209 __asm__("@ __pv_add_carry_stub\n" \ 210 "0: movw %R0, #0\n" \ 211 " adds %Q0, %1, %R0, lsl #20\n" \ 212 "1: mov %R0, %2\n" \ 213 " adc %R0, %R0, #0\n" \ 214 " .pushsection .pv_table,\"a\"\n" \ 215 " .long 0b - ., 1b - .\n" \ 216 " .popsection\n" \ 217 : "=&r" (y) \ 218 : "r" (x), "I" (__PV_BITS_7_0) \ 219 : "cc") 220 221 #else 222 #define __pv_stub(from,to,instr) \ 223 __asm__("@ __pv_stub\n" \ 224 "0: movw %0, #0\n" \ 225 " lsl %0, #21\n" \ 226 " " instr " %0, %1, %0\n" \ 227 " .pushsection .pv_table,\"a\"\n" \ 228 " .long 0b - .\n" \ 229 " .popsection\n" \ 230 : "=&r" (to) \ 231 : "r" (from)) 232 233 #define __pv_add_carry_stub(x, y) \ 234 __asm__("@ __pv_add_carry_stub\n" \ 235 "0: movw %R0, #0\n" \ 236 " lsls %R0, #21\n" \ 237 " adds %Q0, %1, %R0\n" \ 238 "1: mvn %R0, #0\n" \ 239 " adc %R0, %R0, #0\n" \ 240 " .pushsection .pv_table,\"a\"\n" \ 241 " .long 0b - ., 1b - .\n" \ 242 " .popsection\n" \ 243 : "=&r" (y) \ 244 : "r" (x) \ 245 : "cc") 246 #endif 247 248 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 249 { 250 phys_addr_t t; 251 252 if (sizeof(phys_addr_t) == 4) { 253 __pv_stub(x, t, "add"); 254 } else { 255 __pv_add_carry_stub(x, t); 256 } 257 return t; 258 } 259 260 static inline unsigned long __phys_to_virt(phys_addr_t x) 261 { 262 unsigned long t; 263 264 /* 265 * 'unsigned long' cast discard upper word when 266 * phys_addr_t is 64 bit, and makes sure that inline 267 * assembler expression receives 32 bit argument 268 * in place where 'r' 32 bit operand is expected. 269 */ 270 __pv_stub((unsigned long) x, t, "sub"); 271 return t; 272 } 273 274 #else 275 276 #define PHYS_OFFSET PLAT_PHYS_OFFSET 277 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 278 279 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 280 { 281 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 282 } 283 284 static inline unsigned long __phys_to_virt(phys_addr_t x) 285 { 286 return x - PHYS_OFFSET + PAGE_OFFSET; 287 } 288 289 #endif 290 291 #define virt_to_pfn(kaddr) \ 292 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 293 PHYS_PFN_OFFSET) 294 295 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) 296 297 #ifdef CONFIG_DEBUG_VIRTUAL 298 extern phys_addr_t __virt_to_phys(unsigned long x); 299 extern phys_addr_t __phys_addr_symbol(unsigned long x); 300 #else 301 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 302 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 303 #endif 304 305 /* 306 * These are *only* valid on the kernel direct mapped RAM memory. 307 * Note: Drivers should NOT use these. They are the wrong 308 * translation for translating DMA addresses. Use the driver 309 * DMA support - see dma-mapping.h. 310 */ 311 #define virt_to_phys virt_to_phys 312 static inline phys_addr_t virt_to_phys(const volatile void *x) 313 { 314 return __virt_to_phys((unsigned long)(x)); 315 } 316 317 #define phys_to_virt phys_to_virt 318 static inline void *phys_to_virt(phys_addr_t x) 319 { 320 return (void *)__phys_to_virt(x); 321 } 322 323 /* 324 * Drivers should NOT use these either. 325 */ 326 #define __pa(x) __virt_to_phys((unsigned long)(x)) 327 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 328 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 329 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 330 331 extern long long arch_phys_to_idmap_offset; 332 333 /* 334 * These are for systems that have a hardware interconnect supported alias 335 * of physical memory for idmap purposes. Most cases should leave these 336 * untouched. Note: this can only return addresses less than 4GiB. 337 */ 338 static inline bool arm_has_idmap_alias(void) 339 { 340 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; 341 } 342 343 #define IDMAP_INVALID_ADDR ((u32)~0) 344 345 static inline unsigned long phys_to_idmap(phys_addr_t addr) 346 { 347 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { 348 addr += arch_phys_to_idmap_offset; 349 if (addr > (u32)~0) 350 addr = IDMAP_INVALID_ADDR; 351 } 352 return addr; 353 } 354 355 static inline phys_addr_t idmap_to_phys(unsigned long idmap) 356 { 357 phys_addr_t addr = idmap; 358 359 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) 360 addr -= arch_phys_to_idmap_offset; 361 362 return addr; 363 } 364 365 static inline unsigned long __virt_to_idmap(unsigned long x) 366 { 367 return phys_to_idmap(__virt_to_phys(x)); 368 } 369 370 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 371 372 /* 373 * Conversion between a struct page and a physical address. 374 * 375 * page_to_pfn(page) convert a struct page * to a PFN number 376 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 377 * 378 * virt_to_page(k) convert a _valid_ virtual address to struct page * 379 * virt_addr_valid(k) indicates whether a virtual address is valid 380 */ 381 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 382 383 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 384 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 385 && pfn_valid(virt_to_pfn(kaddr))) 386 387 #endif 388 389 #include <asm-generic/memory_model.h> 390 391 #endif 392