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__ 102extern unsigned long setup_vectors_base(void); 103extern 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 */ 171extern u64 kernel_sec_start; 172extern 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 193extern unsigned long __pv_phys_pfn_offset; 194extern u64 __pv_offset; 195extern void fixup_pv_table(const void *, unsigned long); 196extern 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 253static 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 265static 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 284static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 285{ 286 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 287} 288 289static inline unsigned long __phys_to_virt(phys_addr_t x) 290{ 291 return x - PHYS_OFFSET + PAGE_OFFSET; 292} 293 294#endif 295 296static 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 305extern phys_addr_t __virt_to_phys(unsigned long x); 306extern 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 319static 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 325static 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 338extern 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 */ 345static 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 352static 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 362static 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 372static 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