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 page to/from a physical address 123 */ 124 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 125 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 126 127 /* 128 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 129 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 130 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 131 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 132 */ 133 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 134 135 #ifndef __ASSEMBLY__ 136 137 /* 138 * Physical vs virtual RAM address space conversion. These are 139 * private definitions which should NOT be used outside memory.h 140 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 141 * 142 * PFNs are used to describe any physical page; this means 143 * PFN 0 == physical address 0. 144 */ 145 #if defined(__virt_to_phys) 146 #define PHYS_OFFSET PLAT_PHYS_OFFSET 147 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 148 149 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 150 151 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT) 152 153 /* 154 * Constants used to force the right instruction encodings and shifts 155 * so that all we need to do is modify the 8-bit constant field. 156 */ 157 #define __PV_BITS_31_24 0x81000000 158 #define __PV_BITS_7_0 0x81 159 160 extern unsigned long __pv_phys_pfn_offset; 161 extern u64 __pv_offset; 162 extern void fixup_pv_table(const void *, unsigned long); 163 extern const void *__pv_table_begin, *__pv_table_end; 164 165 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 166 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 167 168 #define virt_to_pfn(kaddr) \ 169 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 170 PHYS_PFN_OFFSET) 171 172 #define __pv_stub(from,to,instr,type) \ 173 __asm__("@ __pv_stub\n" \ 174 "1: " instr " %0, %1, %2\n" \ 175 " .pushsection .pv_table,\"a\"\n" \ 176 " .long 1b\n" \ 177 " .popsection\n" \ 178 : "=r" (to) \ 179 : "r" (from), "I" (type)) 180 181 #define __pv_stub_mov_hi(t) \ 182 __asm__ volatile("@ __pv_stub_mov\n" \ 183 "1: mov %R0, %1\n" \ 184 " .pushsection .pv_table,\"a\"\n" \ 185 " .long 1b\n" \ 186 " .popsection\n" \ 187 : "=r" (t) \ 188 : "I" (__PV_BITS_7_0)) 189 190 #define __pv_add_carry_stub(x, y) \ 191 __asm__ volatile("@ __pv_add_carry_stub\n" \ 192 "1: adds %Q0, %1, %2\n" \ 193 " adc %R0, %R0, #0\n" \ 194 " .pushsection .pv_table,\"a\"\n" \ 195 " .long 1b\n" \ 196 " .popsection\n" \ 197 : "+r" (y) \ 198 : "r" (x), "I" (__PV_BITS_31_24) \ 199 : "cc") 200 201 static inline phys_addr_t __virt_to_phys(unsigned long x) 202 { 203 phys_addr_t t; 204 205 if (sizeof(phys_addr_t) == 4) { 206 __pv_stub(x, t, "add", __PV_BITS_31_24); 207 } else { 208 __pv_stub_mov_hi(t); 209 __pv_add_carry_stub(x, t); 210 } 211 return t; 212 } 213 214 static inline unsigned long __phys_to_virt(phys_addr_t x) 215 { 216 unsigned long t; 217 218 /* 219 * 'unsigned long' cast discard upper word when 220 * phys_addr_t is 64 bit, and makes sure that inline 221 * assembler expression receives 32 bit argument 222 * in place where 'r' 32 bit operand is expected. 223 */ 224 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 225 return t; 226 } 227 228 #else 229 230 #define PHYS_OFFSET PLAT_PHYS_OFFSET 231 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 232 233 static inline phys_addr_t __virt_to_phys(unsigned long x) 234 { 235 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 236 } 237 238 static inline unsigned long __phys_to_virt(phys_addr_t x) 239 { 240 return x - PHYS_OFFSET + PAGE_OFFSET; 241 } 242 243 #define virt_to_pfn(kaddr) \ 244 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 245 PHYS_PFN_OFFSET) 246 247 #endif 248 249 /* 250 * These are *only* valid on the kernel direct mapped RAM memory. 251 * Note: Drivers should NOT use these. They are the wrong 252 * translation for translating DMA addresses. Use the driver 253 * DMA support - see dma-mapping.h. 254 */ 255 #define virt_to_phys virt_to_phys 256 static inline phys_addr_t virt_to_phys(const volatile void *x) 257 { 258 return __virt_to_phys((unsigned long)(x)); 259 } 260 261 #define phys_to_virt phys_to_virt 262 static inline void *phys_to_virt(phys_addr_t x) 263 { 264 return (void *)__phys_to_virt(x); 265 } 266 267 /* 268 * Drivers should NOT use these either. 269 */ 270 #define __pa(x) __virt_to_phys((unsigned long)(x)) 271 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 272 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) 273 274 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); 275 276 /* 277 * These are for systems that have a hardware interconnect supported alias of 278 * physical memory for idmap purposes. Most cases should leave these 279 * untouched. 280 */ 281 static inline phys_addr_t __virt_to_idmap(unsigned long x) 282 { 283 if (IS_ENABLED(CONFIG_MMU) && arch_virt_to_idmap) 284 return arch_virt_to_idmap(x); 285 else 286 return __virt_to_phys(x); 287 } 288 289 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 290 291 /* 292 * Virtual <-> DMA view memory address translations 293 * Again, these are *only* valid on the kernel direct mapped RAM 294 * memory. Use of these is *deprecated* (and that doesn't mean 295 * use the __ prefixed forms instead.) See dma-mapping.h. 296 */ 297 #ifndef __virt_to_bus 298 #define __virt_to_bus __virt_to_phys 299 #define __bus_to_virt __phys_to_virt 300 #define __pfn_to_bus(x) __pfn_to_phys(x) 301 #define __bus_to_pfn(x) __phys_to_pfn(x) 302 #endif 303 304 #ifdef CONFIG_VIRT_TO_BUS 305 #define virt_to_bus virt_to_bus 306 static inline __deprecated unsigned long virt_to_bus(void *x) 307 { 308 return __virt_to_bus((unsigned long)x); 309 } 310 311 #define bus_to_virt bus_to_virt 312 static inline __deprecated void *bus_to_virt(unsigned long x) 313 { 314 return (void *)__bus_to_virt(x); 315 } 316 #endif 317 318 /* 319 * Conversion between a struct page and a physical address. 320 * 321 * page_to_pfn(page) convert a struct page * to a PFN number 322 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 323 * 324 * virt_to_page(k) convert a _valid_ virtual address to struct page * 325 * virt_addr_valid(k) indicates whether a virtual address is valid 326 */ 327 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 328 329 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 330 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 331 && pfn_valid(virt_to_pfn(kaddr))) 332 333 #endif 334 335 #include <asm-generic/memory_model.h> 336 337 #endif 338