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