1 /* 2 * arch/arm/include/asm/memory.h 3 * 4 * Copyright (C) 2000-2002 Russell King 5 * modification for nommu, Hyok S. Choi, 2004 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Note: this file should not be included by non-asm/.h files 12 */ 13 #ifndef __ASM_ARM_MEMORY_H 14 #define __ASM_ARM_MEMORY_H 15 16 #include <linux/compiler.h> 17 #include <linux/const.h> 18 #include <linux/types.h> 19 #include <linux/sizes.h> 20 21 #ifdef CONFIG_NEED_MACH_MEMORY_H 22 #include <mach/memory.h> 23 #endif 24 25 /* PAGE_OFFSET - the virtual address of the start of the kernel image */ 26 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 27 28 #ifdef CONFIG_MMU 29 30 /* 31 * TASK_SIZE - the maximum size of a user space task. 32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 33 */ 34 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 35 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 36 37 /* 38 * The maximum size of a 26-bit user space task. 39 */ 40 #define TASK_SIZE_26 (UL(1) << 26) 41 42 /* 43 * The module space lives between the addresses given by TASK_SIZE 44 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 45 */ 46 #ifndef CONFIG_THUMB2_KERNEL 47 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 48 #else 49 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 50 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 51 #endif 52 53 #if TASK_SIZE > MODULES_VADDR 54 #error Top of user space clashes with start of module space 55 #endif 56 57 /* 58 * The highmem pkmap virtual space shares the end of the module area. 59 */ 60 #ifdef CONFIG_HIGHMEM 61 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 62 #else 63 #define MODULES_END (PAGE_OFFSET) 64 #endif 65 66 /* 67 * The XIP kernel gets mapped at the bottom of the module vm area. 68 * Since we use sections to map it, this macro replaces the physical address 69 * with its virtual address while keeping offset from the base section. 70 */ 71 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 72 73 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) 74 /* 75 * Allow 16MB-aligned ioremap pages 76 */ 77 #define IOREMAP_MAX_ORDER 24 78 #endif 79 80 #define VECTORS_BASE UL(0xffff0000) 81 82 #else /* CONFIG_MMU */ 83 84 #ifndef __ASSEMBLY__ 85 extern unsigned long setup_vectors_base(void); 86 extern unsigned long vectors_base; 87 #define VECTORS_BASE vectors_base 88 #endif 89 90 /* 91 * The limitation of user task size can grow up to the end of free ram region. 92 * It is difficult to define and perhaps will never meet the original meaning 93 * of this define that was meant to. 94 * Fortunately, there is no reference for this in noMMU mode, for now. 95 */ 96 #define TASK_SIZE UL(0xffffffff) 97 98 #ifndef TASK_UNMAPPED_BASE 99 #define TASK_UNMAPPED_BASE UL(0x00000000) 100 #endif 101 102 #ifndef END_MEM 103 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 104 #endif 105 106 /* 107 * The module can be at any place in ram in nommu mode. 108 */ 109 #define MODULES_END (END_MEM) 110 #define MODULES_VADDR PAGE_OFFSET 111 112 #define XIP_VIRT_ADDR(physaddr) (physaddr) 113 114 #endif /* !CONFIG_MMU */ 115 116 #ifdef CONFIG_XIP_KERNEL 117 #define KERNEL_START _sdata 118 #else 119 #define KERNEL_START _stext 120 #endif 121 #define KERNEL_END _end 122 123 /* 124 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 125 * locations 126 */ 127 #ifdef CONFIG_HAVE_TCM 128 #define ITCM_OFFSET UL(0xfffe0000) 129 #define DTCM_OFFSET UL(0xfffe8000) 130 #endif 131 132 /* 133 * Convert a page to/from a physical address 134 */ 135 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 136 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 137 138 /* 139 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 140 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 141 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 142 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 143 */ 144 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 145 146 #ifdef CONFIG_XIP_KERNEL 147 /* 148 * When referencing data in RAM from the XIP region in a relative manner 149 * with the MMU off, we need the relative offset between the two physical 150 * addresses. The macro below achieves this, which is: 151 * __pa(v_data) - __xip_pa(v_text) 152 */ 153 #define PHYS_RELATIVE(v_data, v_text) \ 154 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \ 155 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \ 156 CONFIG_XIP_PHYS_ADDR)) 157 #else 158 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text)) 159 #endif 160 161 #ifndef __ASSEMBLY__ 162 163 /* 164 * Physical vs virtual RAM address space conversion. These are 165 * private definitions which should NOT be used outside memory.h 166 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 167 * 168 * PFNs are used to describe any physical page; this means 169 * PFN 0 == physical address 0. 170 */ 171 172 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT) 173 174 /* 175 * Constants used to force the right instruction encodings and shifts 176 * so that all we need to do is modify the 8-bit constant field. 177 */ 178 #define __PV_BITS_31_24 0x81000000 179 #define __PV_BITS_7_0 0x81 180 181 extern unsigned long __pv_phys_pfn_offset; 182 extern u64 __pv_offset; 183 extern void fixup_pv_table(const void *, unsigned long); 184 extern const void *__pv_table_begin, *__pv_table_end; 185 186 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 187 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 188 189 #define __pv_stub(from,to,instr,type) \ 190 __asm__("@ __pv_stub\n" \ 191 "1: " instr " %0, %1, %2\n" \ 192 " .pushsection .pv_table,\"a\"\n" \ 193 " .long 1b\n" \ 194 " .popsection\n" \ 195 : "=r" (to) \ 196 : "r" (from), "I" (type)) 197 198 #define __pv_stub_mov_hi(t) \ 199 __asm__ volatile("@ __pv_stub_mov\n" \ 200 "1: mov %R0, %1\n" \ 201 " .pushsection .pv_table,\"a\"\n" \ 202 " .long 1b\n" \ 203 " .popsection\n" \ 204 : "=r" (t) \ 205 : "I" (__PV_BITS_7_0)) 206 207 #define __pv_add_carry_stub(x, y) \ 208 __asm__ volatile("@ __pv_add_carry_stub\n" \ 209 "1: adds %Q0, %1, %2\n" \ 210 " adc %R0, %R0, #0\n" \ 211 " .pushsection .pv_table,\"a\"\n" \ 212 " .long 1b\n" \ 213 " .popsection\n" \ 214 : "+r" (y) \ 215 : "r" (x), "I" (__PV_BITS_31_24) \ 216 : "cc") 217 218 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 219 { 220 phys_addr_t t; 221 222 if (sizeof(phys_addr_t) == 4) { 223 __pv_stub(x, t, "add", __PV_BITS_31_24); 224 } else { 225 __pv_stub_mov_hi(t); 226 __pv_add_carry_stub(x, t); 227 } 228 return t; 229 } 230 231 static inline unsigned long __phys_to_virt(phys_addr_t x) 232 { 233 unsigned long t; 234 235 /* 236 * 'unsigned long' cast discard upper word when 237 * phys_addr_t is 64 bit, and makes sure that inline 238 * assembler expression receives 32 bit argument 239 * in place where 'r' 32 bit operand is expected. 240 */ 241 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 242 return t; 243 } 244 245 #else 246 247 #define PHYS_OFFSET PLAT_PHYS_OFFSET 248 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 249 250 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) 251 { 252 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 253 } 254 255 static inline unsigned long __phys_to_virt(phys_addr_t x) 256 { 257 return x - PHYS_OFFSET + PAGE_OFFSET; 258 } 259 260 #endif 261 262 #define virt_to_pfn(kaddr) \ 263 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 264 PHYS_PFN_OFFSET) 265 266 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) 267 268 #ifdef CONFIG_DEBUG_VIRTUAL 269 extern phys_addr_t __virt_to_phys(unsigned long x); 270 extern phys_addr_t __phys_addr_symbol(unsigned long x); 271 #else 272 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 273 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 274 #endif 275 276 /* 277 * These are *only* valid on the kernel direct mapped RAM memory. 278 * Note: Drivers should NOT use these. They are the wrong 279 * translation for translating DMA addresses. Use the driver 280 * DMA support - see dma-mapping.h. 281 */ 282 #define virt_to_phys virt_to_phys 283 static inline phys_addr_t virt_to_phys(const volatile void *x) 284 { 285 return __virt_to_phys((unsigned long)(x)); 286 } 287 288 #define phys_to_virt phys_to_virt 289 static inline void *phys_to_virt(phys_addr_t x) 290 { 291 return (void *)__phys_to_virt(x); 292 } 293 294 /* 295 * Drivers should NOT use these either. 296 */ 297 #define __pa(x) __virt_to_phys((unsigned long)(x)) 298 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 299 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 300 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 301 302 extern long long arch_phys_to_idmap_offset; 303 304 /* 305 * These are for systems that have a hardware interconnect supported alias 306 * of physical memory for idmap purposes. Most cases should leave these 307 * untouched. Note: this can only return addresses less than 4GiB. 308 */ 309 static inline bool arm_has_idmap_alias(void) 310 { 311 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; 312 } 313 314 #define IDMAP_INVALID_ADDR ((u32)~0) 315 316 static inline unsigned long phys_to_idmap(phys_addr_t addr) 317 { 318 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { 319 addr += arch_phys_to_idmap_offset; 320 if (addr > (u32)~0) 321 addr = IDMAP_INVALID_ADDR; 322 } 323 return addr; 324 } 325 326 static inline phys_addr_t idmap_to_phys(unsigned long idmap) 327 { 328 phys_addr_t addr = idmap; 329 330 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) 331 addr -= arch_phys_to_idmap_offset; 332 333 return addr; 334 } 335 336 static inline unsigned long __virt_to_idmap(unsigned long x) 337 { 338 return phys_to_idmap(__virt_to_phys(x)); 339 } 340 341 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 342 343 /* 344 * Virtual <-> DMA view memory address translations 345 * Again, these are *only* valid on the kernel direct mapped RAM 346 * memory. Use of these is *deprecated* (and that doesn't mean 347 * use the __ prefixed forms instead.) See dma-mapping.h. 348 */ 349 #ifndef __virt_to_bus 350 #define __virt_to_bus __virt_to_phys 351 #define __bus_to_virt __phys_to_virt 352 #define __pfn_to_bus(x) __pfn_to_phys(x) 353 #define __bus_to_pfn(x) __phys_to_pfn(x) 354 #endif 355 356 /* 357 * Conversion between a struct page and a physical address. 358 * 359 * page_to_pfn(page) convert a struct page * to a PFN number 360 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 361 * 362 * virt_to_page(k) convert a _valid_ virtual address to struct page * 363 * virt_addr_valid(k) indicates whether a virtual address is valid 364 */ 365 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 366 367 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 368 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 369 && pfn_valid(virt_to_pfn(kaddr))) 370 371 #endif 372 373 #include <asm-generic/memory_model.h> 374 375 #endif 376