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 explicitly, include <asm/page.h> 9 * to get access to these definitions. 10 */ 11 #ifndef __ASM_ARM_MEMORY_H 12 #define __ASM_ARM_MEMORY_H 13 14 #ifndef _ASMARM_PAGE_H 15 #error "Do not include <asm/memory.h> directly" 16 #endif 17 18 #include <linux/compiler.h> 19 #include <linux/const.h> 20 #include <linux/types.h> 21 #include <linux/sizes.h> 22 23 #ifdef CONFIG_NEED_MACH_MEMORY_H 24 #include <mach/memory.h> 25 #endif 26 #include <asm/kasan_def.h> 27 28 /* 29 * PAGE_OFFSET: the virtual address of the start of lowmem, memory above 30 * the virtual address range for userspace. 31 * KERNEL_OFFSET: the virtual address of the start of the kernel image. 32 * we may further offset this with TEXT_OFFSET in practice. 33 */ 34 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 35 #define KERNEL_OFFSET (PAGE_OFFSET) 36 37 #ifdef CONFIG_MMU 38 39 /* 40 * TASK_SIZE - the maximum size of a user space task. 41 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 42 */ 43 #ifndef CONFIG_KASAN 44 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 45 #else 46 #define TASK_SIZE (KASAN_SHADOW_START) 47 #endif 48 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 49 50 /* 51 * The maximum size of a 26-bit user space task. 52 */ 53 #define TASK_SIZE_26 (UL(1) << 26) 54 55 /* 56 * The module space lives between the addresses given by TASK_SIZE 57 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 58 */ 59 #ifndef CONFIG_THUMB2_KERNEL 60 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 61 #else 62 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 63 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 64 #endif 65 66 #if TASK_SIZE > MODULES_VADDR 67 #error Top of user space clashes with start of module space 68 #endif 69 70 /* 71 * The highmem pkmap virtual space shares the end of the module area. 72 */ 73 #ifdef CONFIG_HIGHMEM 74 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 75 #else 76 #define MODULES_END (PAGE_OFFSET) 77 #endif 78 79 /* 80 * The XIP kernel gets mapped at the bottom of the module vm area. 81 * Since we use sections to map it, this macro replaces the physical address 82 * with its virtual address while keeping offset from the base section. 83 */ 84 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 85 86 #define FDT_FIXED_BASE UL(0xff800000) 87 #define FDT_FIXED_SIZE (2 * SECTION_SIZE) 88 #define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE)) 89 90 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) 91 /* 92 * Allow 16MB-aligned ioremap pages 93 */ 94 #define IOREMAP_MAX_ORDER 24 95 #endif 96 97 #define VECTORS_BASE UL(0xffff0000) 98 99 #else /* CONFIG_MMU */ 100 101 #ifndef __ASSEMBLY__ 102 extern unsigned long setup_vectors_base(void); 103 extern unsigned long vectors_base; 104 #define VECTORS_BASE vectors_base 105 #endif 106 107 /* 108 * The limitation of user task size can grow up to the end of free ram region. 109 * It is difficult to define and perhaps will never meet the original meaning 110 * of this define that was meant to. 111 * Fortunately, there is no reference for this in noMMU mode, for now. 112 */ 113 #define TASK_SIZE UL(0xffffffff) 114 115 #ifndef TASK_UNMAPPED_BASE 116 #define TASK_UNMAPPED_BASE UL(0x00000000) 117 #endif 118 119 #ifndef END_MEM 120 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 121 #endif 122 123 /* 124 * The module can be at any place in ram in nommu mode. 125 */ 126 #define MODULES_END (END_MEM) 127 #define MODULES_VADDR PAGE_OFFSET 128 129 #define XIP_VIRT_ADDR(physaddr) (physaddr) 130 #define FDT_VIRT_BASE(physbase) ((void *)(physbase)) 131 132 #endif /* !CONFIG_MMU */ 133 134 #ifdef CONFIG_XIP_KERNEL 135 #define KERNEL_START _sdata 136 #else 137 #define KERNEL_START _stext 138 #endif 139 #define KERNEL_END _end 140 141 /* 142 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 143 * locations 144 */ 145 #ifdef CONFIG_HAVE_TCM 146 #define ITCM_OFFSET UL(0xfffe0000) 147 #define DTCM_OFFSET UL(0xfffe8000) 148 #endif 149 150 /* 151 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 152 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 153 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 154 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 155 */ 156 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 157 158 #ifndef __ASSEMBLY__ 159 160 /* 161 * Physical start and end address of the kernel sections. These addresses are 162 * 2MB-aligned to match the section mappings placed over the kernel. We use 163 * u64 so that LPAE mappings beyond the 32bit limit will work out as well. 164 */ 165 extern u64 kernel_sec_start; 166 extern u64 kernel_sec_end; 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_23_16 0x810000 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 #ifndef CONFIG_THUMB2_KERNEL 196 #define __pv_stub(from,to,instr) \ 197 __asm__("@ __pv_stub\n" \ 198 "1: " instr " %0, %1, %2\n" \ 199 "2: " instr " %0, %0, %3\n" \ 200 " .pushsection .pv_table,\"a\"\n" \ 201 " .long 1b - ., 2b - .\n" \ 202 " .popsection\n" \ 203 : "=r" (to) \ 204 : "r" (from), "I" (__PV_BITS_31_24), \ 205 "I"(__PV_BITS_23_16)) 206 207 #define __pv_add_carry_stub(x, y) \ 208 __asm__("@ __pv_add_carry_stub\n" \ 209 "0: movw %R0, #0\n" \ 210 " adds %Q0, %1, %R0, lsl #20\n" \ 211 "1: mov %R0, %2\n" \ 212 " adc %R0, %R0, #0\n" \ 213 " .pushsection .pv_table,\"a\"\n" \ 214 " .long 0b - ., 1b - .\n" \ 215 " .popsection\n" \ 216 : "=&r" (y) \ 217 : "r" (x), "I" (__PV_BITS_7_0) \ 218 : "cc") 219 220 #else 221 #define __pv_stub(from,to,instr) \ 222 __asm__("@ __pv_stub\n" \ 223 "0: movw %0, #0\n" \ 224 " lsl %0, #21\n" \ 225 " " instr " %0, %1, %0\n" \ 226 " .pushsection .pv_table,\"a\"\n" \ 227 " .long 0b - .\n" \ 228 " .popsection\n" \ 229 : "=&r" (to) \ 230 : "r" (from)) 231 232 #define __pv_add_carry_stub(x, y) \ 233 __asm__("@ __pv_add_carry_stub\n" \ 234 "0: movw %R0, #0\n" \ 235 " lsls %R0, #21\n" \ 236 " adds %Q0, %1, %R0\n" \ 237 "1: mvn %R0, #0\n" \ 238 " adc %R0, %R0, #0\n" \ 239 " .pushsection .pv_table,\"a\"\n" \ 240 " .long 0b - ., 1b - .\n" \ 241 " .popsection\n" \ 242 : "=&r" (y) \ 243 : "r" (x) \ 244 : "cc") 245 #endif 246 247 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 248 { 249 phys_addr_t t; 250 251 if (sizeof(phys_addr_t) == 4) { 252 __pv_stub(x, t, "add"); 253 } else { 254 __pv_add_carry_stub(x, t); 255 } 256 return t; 257 } 258 259 static inline unsigned long __phys_to_virt(phys_addr_t x) 260 { 261 unsigned long t; 262 263 /* 264 * 'unsigned long' cast discard upper word when 265 * phys_addr_t is 64 bit, and makes sure that inline 266 * assembler expression receives 32 bit argument 267 * in place where 'r' 32 bit operand is expected. 268 */ 269 __pv_stub((unsigned long) x, t, "sub"); 270 return t; 271 } 272 273 #else 274 275 #define PHYS_OFFSET PLAT_PHYS_OFFSET 276 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 277 278 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 279 { 280 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 281 } 282 283 static inline unsigned long __phys_to_virt(phys_addr_t x) 284 { 285 return x - PHYS_OFFSET + PAGE_OFFSET; 286 } 287 288 #endif 289 290 static inline unsigned long virt_to_pfn(const void *p) 291 { 292 unsigned long kaddr = (unsigned long)p; 293 return (((kaddr - PAGE_OFFSET) >> PAGE_SHIFT) + 294 PHYS_PFN_OFFSET); 295 } 296 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) 297 298 #ifdef CONFIG_DEBUG_VIRTUAL 299 extern phys_addr_t __virt_to_phys(unsigned long x); 300 extern phys_addr_t __phys_addr_symbol(unsigned long x); 301 #else 302 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 303 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 304 #endif 305 306 /* 307 * These are *only* valid on the kernel direct mapped RAM memory. 308 * Note: Drivers should NOT use these. They are the wrong 309 * translation for translating DMA addresses. Use the driver 310 * DMA support - see dma-mapping.h. 311 */ 312 #define virt_to_phys virt_to_phys 313 static inline phys_addr_t virt_to_phys(const volatile void *x) 314 { 315 return __virt_to_phys((unsigned long)(x)); 316 } 317 318 #define phys_to_virt phys_to_virt 319 static inline void *phys_to_virt(phys_addr_t x) 320 { 321 return (void *)__phys_to_virt(x); 322 } 323 324 /* 325 * Drivers should NOT use these either. 326 */ 327 #define __pa(x) __virt_to_phys((unsigned long)(x)) 328 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 329 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 330 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 331 332 extern long long arch_phys_to_idmap_offset; 333 334 /* 335 * These are for systems that have a hardware interconnect supported alias 336 * of physical memory for idmap purposes. Most cases should leave these 337 * untouched. Note: this can only return addresses less than 4GiB. 338 */ 339 static inline bool arm_has_idmap_alias(void) 340 { 341 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; 342 } 343 344 #define IDMAP_INVALID_ADDR ((u32)~0) 345 346 static inline unsigned long phys_to_idmap(phys_addr_t addr) 347 { 348 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { 349 addr += arch_phys_to_idmap_offset; 350 if (addr > (u32)~0) 351 addr = IDMAP_INVALID_ADDR; 352 } 353 return addr; 354 } 355 356 static inline phys_addr_t idmap_to_phys(unsigned long idmap) 357 { 358 phys_addr_t addr = idmap; 359 360 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) 361 addr -= arch_phys_to_idmap_offset; 362 363 return addr; 364 } 365 366 static inline unsigned long __virt_to_idmap(unsigned long x) 367 { 368 return phys_to_idmap(__virt_to_phys(x)); 369 } 370 371 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 372 373 /* 374 * Conversion between a struct page and a physical address. 375 * 376 * page_to_pfn(page) convert a struct page * to a PFN number 377 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 378 * 379 * virt_to_page(k) convert a _valid_ virtual address to struct page * 380 * virt_addr_valid(k) indicates whether a virtual address is valid 381 */ 382 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 383 384 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 385 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 386 && pfn_valid(virt_to_pfn(kaddr))) 387 388 #endif 389 390 #endif 391