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 #include <asm/cache.h> 22 23 #ifdef CONFIG_NEED_MACH_MEMORY_H 24 #include <mach/memory.h> 25 #endif 26 27 /* 28 * Allow for constants defined here to be used from assembly code 29 * by prepending the UL suffix only with actual C code compilation. 30 */ 31 #define UL(x) _AC(x, UL) 32 33 #ifdef CONFIG_MMU 34 35 /* 36 * PAGE_OFFSET - the virtual address of the start of the kernel image 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 PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 41 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 42 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 43 44 /* 45 * The maximum size of a 26-bit user space task. 46 */ 47 #define TASK_SIZE_26 (UL(1) << 26) 48 49 /* 50 * The module space lives between the addresses given by TASK_SIZE 51 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 52 */ 53 #ifndef CONFIG_THUMB2_KERNEL 54 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 55 #else 56 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 57 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 58 #endif 59 60 #if TASK_SIZE > MODULES_VADDR 61 #error Top of user space clashes with start of module space 62 #endif 63 64 /* 65 * The highmem pkmap virtual space shares the end of the module area. 66 */ 67 #ifdef CONFIG_HIGHMEM 68 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 69 #else 70 #define MODULES_END (PAGE_OFFSET) 71 #endif 72 73 /* 74 * The XIP kernel gets mapped at the bottom of the module vm area. 75 * Since we use sections to map it, this macro replaces the physical address 76 * with its virtual address while keeping offset from the base section. 77 */ 78 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 79 80 /* 81 * Allow 16MB-aligned ioremap pages 82 */ 83 #define IOREMAP_MAX_ORDER 24 84 85 #define CONSISTENT_END (0xffe00000UL) 86 87 #else /* CONFIG_MMU */ 88 89 /* 90 * The limitation of user task size can grow up to the end of free ram region. 91 * It is difficult to define and perhaps will never meet the original meaning 92 * of this define that was meant to. 93 * Fortunately, there is no reference for this in noMMU mode, for now. 94 */ 95 #ifndef TASK_SIZE 96 #define TASK_SIZE (CONFIG_DRAM_SIZE) 97 #endif 98 99 #ifndef TASK_UNMAPPED_BASE 100 #define TASK_UNMAPPED_BASE UL(0x00000000) 101 #endif 102 103 #ifndef END_MEM 104 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 105 #endif 106 107 #ifndef PAGE_OFFSET 108 #define PAGE_OFFSET PLAT_PHYS_OFFSET 109 #endif 110 111 /* 112 * The module can be at any place in ram in nommu mode. 113 */ 114 #define MODULES_END (END_MEM) 115 #define MODULES_VADDR PAGE_OFFSET 116 117 #define XIP_VIRT_ADDR(physaddr) (physaddr) 118 119 #endif /* !CONFIG_MMU */ 120 121 /* 122 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 123 * locations 124 */ 125 #ifdef CONFIG_HAVE_TCM 126 #define ITCM_OFFSET UL(0xfffe0000) 127 #define DTCM_OFFSET UL(0xfffe8000) 128 #endif 129 130 /* 131 * Convert a physical address to a Page Frame Number and back 132 */ 133 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 134 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 135 136 /* 137 * Convert a page to/from a physical address 138 */ 139 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 140 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 141 142 /* 143 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed 144 * around in head.S and proc-*.S are shifted by this amount, in order to 145 * leave spare high bits for systems with physical address extension. This 146 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but 147 * gives us about 38-bits or so. 148 */ 149 #ifdef CONFIG_ARM_LPAE 150 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT 151 #else 152 #define ARCH_PGD_SHIFT 0 153 #endif 154 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) 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, or by kernels which 159 * have their own mach/memory.h. Assembly code must always use 160 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 161 */ 162 #ifndef PLAT_PHYS_OFFSET 163 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 164 #endif 165 166 #ifndef __ASSEMBLY__ 167 168 /* 169 * Physical vs virtual RAM address space conversion. These are 170 * private definitions which should NOT be used outside memory.h 171 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 172 */ 173 #ifndef __virt_to_phys 174 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT 175 176 /* 177 * Constants used to force the right instruction encodings and shifts 178 * so that all we need to do is modify the 8-bit constant field. 179 */ 180 #define __PV_BITS_31_24 0x81000000 181 #define __PV_BITS_7_0 0x81 182 183 extern u64 __pv_phys_offset; 184 extern u64 __pv_offset; 185 extern void fixup_pv_table(const void *, unsigned long); 186 extern const void *__pv_table_begin, *__pv_table_end; 187 188 #define PHYS_OFFSET __pv_phys_offset 189 190 #define __pv_stub(from,to,instr,type) \ 191 __asm__("@ __pv_stub\n" \ 192 "1: " instr " %0, %1, %2\n" \ 193 " .pushsection .pv_table,\"a\"\n" \ 194 " .long 1b\n" \ 195 " .popsection\n" \ 196 : "=r" (to) \ 197 : "r" (from), "I" (type)) 198 199 #define __pv_stub_mov_hi(t) \ 200 __asm__ volatile("@ __pv_stub_mov\n" \ 201 "1: mov %R0, %1\n" \ 202 " .pushsection .pv_table,\"a\"\n" \ 203 " .long 1b\n" \ 204 " .popsection\n" \ 205 : "=r" (t) \ 206 : "I" (__PV_BITS_7_0)) 207 208 #define __pv_add_carry_stub(x, y) \ 209 __asm__ volatile("@ __pv_add_carry_stub\n" \ 210 "1: adds %Q0, %1, %2\n" \ 211 " adc %R0, %R0, #0\n" \ 212 " .pushsection .pv_table,\"a\"\n" \ 213 " .long 1b\n" \ 214 " .popsection\n" \ 215 : "+r" (y) \ 216 : "r" (x), "I" (__PV_BITS_31_24) \ 217 : "cc") 218 219 static inline phys_addr_t __virt_to_phys(unsigned long x) 220 { 221 phys_addr_t t; 222 223 if (sizeof(phys_addr_t) == 4) { 224 __pv_stub(x, t, "add", __PV_BITS_31_24); 225 } else { 226 __pv_stub_mov_hi(t); 227 __pv_add_carry_stub(x, t); 228 } 229 return t; 230 } 231 232 static inline unsigned long __phys_to_virt(phys_addr_t x) 233 { 234 unsigned long t; 235 236 /* 237 * 'unsigned long' cast discard upper word when 238 * phys_addr_t is 64 bit, and makes sure that inline 239 * assembler expression receives 32 bit argument 240 * in place where 'r' 32 bit operand is expected. 241 */ 242 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 243 return t; 244 } 245 246 #else 247 248 #define PHYS_OFFSET PLAT_PHYS_OFFSET 249 250 static inline phys_addr_t __virt_to_phys(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 #endif 262 263 /* 264 * PFNs are used to describe any physical page; this means 265 * PFN 0 == physical address 0. 266 * 267 * This is the PFN of the first RAM page in the kernel 268 * direct-mapped view. We assume this is the first page 269 * of RAM in the mem_map as well. 270 */ 271 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 272 273 /* 274 * These are *only* valid on the kernel direct mapped RAM memory. 275 * Note: Drivers should NOT use these. They are the wrong 276 * translation for translating DMA addresses. Use the driver 277 * DMA support - see dma-mapping.h. 278 */ 279 static inline phys_addr_t virt_to_phys(const volatile void *x) 280 { 281 return __virt_to_phys((unsigned long)(x)); 282 } 283 284 static inline void *phys_to_virt(phys_addr_t x) 285 { 286 return (void *)__phys_to_virt(x); 287 } 288 289 /* 290 * Drivers should NOT use these either. 291 */ 292 #define __pa(x) __virt_to_phys((unsigned long)(x)) 293 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 294 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 295 296 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); 297 298 /* 299 * These are for systems that have a hardware interconnect supported alias of 300 * physical memory for idmap purposes. Most cases should leave these 301 * untouched. 302 */ 303 static inline phys_addr_t __virt_to_idmap(unsigned long x) 304 { 305 if (arch_virt_to_idmap) 306 return arch_virt_to_idmap(x); 307 else 308 return __virt_to_phys(x); 309 } 310 311 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 312 313 /* 314 * Virtual <-> DMA view memory address translations 315 * Again, these are *only* valid on the kernel direct mapped RAM 316 * memory. Use of these is *deprecated* (and that doesn't mean 317 * use the __ prefixed forms instead.) See dma-mapping.h. 318 */ 319 #ifndef __virt_to_bus 320 #define __virt_to_bus __virt_to_phys 321 #define __bus_to_virt __phys_to_virt 322 #define __pfn_to_bus(x) __pfn_to_phys(x) 323 #define __bus_to_pfn(x) __phys_to_pfn(x) 324 #endif 325 326 #ifdef CONFIG_VIRT_TO_BUS 327 static inline __deprecated unsigned long virt_to_bus(void *x) 328 { 329 return __virt_to_bus((unsigned long)x); 330 } 331 332 static inline __deprecated void *bus_to_virt(unsigned long x) 333 { 334 return (void *)__bus_to_virt(x); 335 } 336 #endif 337 338 /* 339 * Conversion between a struct page and a physical address. 340 * 341 * page_to_pfn(page) convert a struct page * to a PFN number 342 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 343 * 344 * virt_to_page(k) convert a _valid_ virtual address to struct page * 345 * virt_addr_valid(k) indicates whether a virtual address is valid 346 */ 347 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 348 349 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 350 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 351 352 #endif 353 354 #include <asm-generic/memory_model.h> 355 356 #endif 357