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 * Convert a page to/from a physical address 152 */ 153 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 154 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 155 156 /* 157 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 158 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 159 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 160 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 161 */ 162 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 163 164 #ifndef __ASSEMBLY__ 165 166 /* 167 * Physical start and end address of the kernel sections. These addresses are 168 * 2MB-aligned to match the section mappings placed over the kernel. We use 169 * u64 so that LPAE mappings beyond the 32bit limit will work out as well. 170 */ 171 extern u64 kernel_sec_start; 172 extern u64 kernel_sec_end; 173 174 /* 175 * Physical vs virtual RAM address space conversion. These are 176 * private definitions which should NOT be used outside memory.h 177 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 178 * 179 * PFNs are used to describe any physical page; this means 180 * PFN 0 == physical address 0. 181 */ 182 183 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT) 184 185 /* 186 * Constants used to force the right instruction encodings and shifts 187 * so that all we need to do is modify the 8-bit constant field. 188 */ 189 #define __PV_BITS_31_24 0x81000000 190 #define __PV_BITS_23_16 0x810000 191 #define __PV_BITS_7_0 0x81 192 193 extern unsigned long __pv_phys_pfn_offset; 194 extern u64 __pv_offset; 195 extern void fixup_pv_table(const void *, unsigned long); 196 extern const void *__pv_table_begin, *__pv_table_end; 197 198 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 199 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 200 201 #ifndef CONFIG_THUMB2_KERNEL 202 #define __pv_stub(from,to,instr) \ 203 __asm__("@ __pv_stub\n" \ 204 "1: " instr " %0, %1, %2\n" \ 205 "2: " instr " %0, %0, %3\n" \ 206 " .pushsection .pv_table,\"a\"\n" \ 207 " .long 1b - ., 2b - .\n" \ 208 " .popsection\n" \ 209 : "=r" (to) \ 210 : "r" (from), "I" (__PV_BITS_31_24), \ 211 "I"(__PV_BITS_23_16)) 212 213 #define __pv_add_carry_stub(x, y) \ 214 __asm__("@ __pv_add_carry_stub\n" \ 215 "0: movw %R0, #0\n" \ 216 " adds %Q0, %1, %R0, lsl #20\n" \ 217 "1: mov %R0, %2\n" \ 218 " adc %R0, %R0, #0\n" \ 219 " .pushsection .pv_table,\"a\"\n" \ 220 " .long 0b - ., 1b - .\n" \ 221 " .popsection\n" \ 222 : "=&r" (y) \ 223 : "r" (x), "I" (__PV_BITS_7_0) \ 224 : "cc") 225 226 #else 227 #define __pv_stub(from,to,instr) \ 228 __asm__("@ __pv_stub\n" \ 229 "0: movw %0, #0\n" \ 230 " lsl %0, #21\n" \ 231 " " instr " %0, %1, %0\n" \ 232 " .pushsection .pv_table,\"a\"\n" \ 233 " .long 0b - .\n" \ 234 " .popsection\n" \ 235 : "=&r" (to) \ 236 : "r" (from)) 237 238 #define __pv_add_carry_stub(x, y) \ 239 __asm__("@ __pv_add_carry_stub\n" \ 240 "0: movw %R0, #0\n" \ 241 " lsls %R0, #21\n" \ 242 " adds %Q0, %1, %R0\n" \ 243 "1: mvn %R0, #0\n" \ 244 " adc %R0, %R0, #0\n" \ 245 " .pushsection .pv_table,\"a\"\n" \ 246 " .long 0b - ., 1b - .\n" \ 247 " .popsection\n" \ 248 : "=&r" (y) \ 249 : "r" (x) \ 250 : "cc") 251 #endif 252 __virt_to_phys_nodebug(unsigned long x)253 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 254 { 255 phys_addr_t t; 256 257 if (sizeof(phys_addr_t) == 4) { 258 __pv_stub(x, t, "add"); 259 } else { 260 __pv_add_carry_stub(x, t); 261 } 262 return t; 263 } 264 __phys_to_virt(phys_addr_t x)265 static inline unsigned long __phys_to_virt(phys_addr_t x) 266 { 267 unsigned long t; 268 269 /* 270 * 'unsigned long' cast discard upper word when 271 * phys_addr_t is 64 bit, and makes sure that inline 272 * assembler expression receives 32 bit argument 273 * in place where 'r' 32 bit operand is expected. 274 */ 275 __pv_stub((unsigned long) x, t, "sub"); 276 return t; 277 } 278 279 #else 280 281 #define PHYS_OFFSET PLAT_PHYS_OFFSET 282 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 283 __virt_to_phys_nodebug(unsigned long x)284 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 285 { 286 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 287 } 288 __phys_to_virt(phys_addr_t x)289 static inline unsigned long __phys_to_virt(phys_addr_t x) 290 { 291 return x - PHYS_OFFSET + PAGE_OFFSET; 292 } 293 294 #endif 295 virt_to_pfn(const void * p)296 static inline unsigned long virt_to_pfn(const void *p) 297 { 298 unsigned long kaddr = (unsigned long)p; 299 return (((kaddr - PAGE_OFFSET) >> PAGE_SHIFT) + 300 PHYS_PFN_OFFSET); 301 } 302 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) 303 304 #ifdef CONFIG_DEBUG_VIRTUAL 305 extern phys_addr_t __virt_to_phys(unsigned long x); 306 extern phys_addr_t __phys_addr_symbol(unsigned long x); 307 #else 308 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 309 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 310 #endif 311 312 /* 313 * These are *only* valid on the kernel direct mapped RAM memory. 314 * Note: Drivers should NOT use these. They are the wrong 315 * translation for translating DMA addresses. Use the driver 316 * DMA support - see dma-mapping.h. 317 */ 318 #define virt_to_phys virt_to_phys virt_to_phys(const volatile void * x)319 static inline phys_addr_t virt_to_phys(const volatile void *x) 320 { 321 return __virt_to_phys((unsigned long)(x)); 322 } 323 324 #define phys_to_virt phys_to_virt phys_to_virt(phys_addr_t x)325 static inline void *phys_to_virt(phys_addr_t x) 326 { 327 return (void *)__phys_to_virt(x); 328 } 329 330 /* 331 * Drivers should NOT use these either. 332 */ 333 #define __pa(x) __virt_to_phys((unsigned long)(x)) 334 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 335 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 336 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 337 338 extern long long arch_phys_to_idmap_offset; 339 340 /* 341 * These are for systems that have a hardware interconnect supported alias 342 * of physical memory for idmap purposes. Most cases should leave these 343 * untouched. Note: this can only return addresses less than 4GiB. 344 */ arm_has_idmap_alias(void)345 static inline bool arm_has_idmap_alias(void) 346 { 347 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; 348 } 349 350 #define IDMAP_INVALID_ADDR ((u32)~0) 351 phys_to_idmap(phys_addr_t addr)352 static inline unsigned long phys_to_idmap(phys_addr_t addr) 353 { 354 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { 355 addr += arch_phys_to_idmap_offset; 356 if (addr > (u32)~0) 357 addr = IDMAP_INVALID_ADDR; 358 } 359 return addr; 360 } 361 idmap_to_phys(unsigned long idmap)362 static inline phys_addr_t idmap_to_phys(unsigned long idmap) 363 { 364 phys_addr_t addr = idmap; 365 366 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) 367 addr -= arch_phys_to_idmap_offset; 368 369 return addr; 370 } 371 __virt_to_idmap(unsigned long x)372 static inline unsigned long __virt_to_idmap(unsigned long x) 373 { 374 return phys_to_idmap(__virt_to_phys(x)); 375 } 376 377 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 378 379 /* 380 * Conversion between a struct page and a physical address. 381 * 382 * page_to_pfn(page) convert a struct page * to a PFN number 383 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 384 * 385 * virt_to_page(k) convert a _valid_ virtual address to struct page * 386 * virt_addr_valid(k) indicates whether a virtual address is valid 387 */ 388 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 389 390 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 391 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 392 && pfn_valid(virt_to_pfn(kaddr))) 393 394 #endif 395 396 #endif 397