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 /* PAGE_OFFSET - the virtual address of the start of the kernel image */ 34 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 35 36 #ifdef CONFIG_MMU 37 38 /* 39 * TASK_SIZE - the maximum size of a user space task. 40 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 41 */ 42 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 43 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 44 45 /* 46 * The maximum size of a 26-bit user space task. 47 */ 48 #define TASK_SIZE_26 (UL(1) << 26) 49 50 /* 51 * The module space lives between the addresses given by TASK_SIZE 52 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 53 */ 54 #ifndef CONFIG_THUMB2_KERNEL 55 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 56 #else 57 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 58 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 59 #endif 60 61 #if TASK_SIZE > MODULES_VADDR 62 #error Top of user space clashes with start of module space 63 #endif 64 65 /* 66 * The highmem pkmap virtual space shares the end of the module area. 67 */ 68 #ifdef CONFIG_HIGHMEM 69 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 70 #else 71 #define MODULES_END (PAGE_OFFSET) 72 #endif 73 74 /* 75 * The XIP kernel gets mapped at the bottom of the module vm area. 76 * Since we use sections to map it, this macro replaces the physical address 77 * with its virtual address while keeping offset from the base section. 78 */ 79 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 80 81 /* 82 * Allow 16MB-aligned ioremap pages 83 */ 84 #define IOREMAP_MAX_ORDER 24 85 86 #define CONSISTENT_END (0xffe00000UL) 87 88 #else /* CONFIG_MMU */ 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 #ifndef TASK_SIZE 97 #define TASK_SIZE (CONFIG_DRAM_SIZE) 98 #endif 99 100 #ifndef TASK_UNMAPPED_BASE 101 #define TASK_UNMAPPED_BASE UL(0x00000000) 102 #endif 103 104 #ifndef END_MEM 105 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 106 #endif 107 108 /* 109 * The module can be at any place in ram in nommu mode. 110 */ 111 #define MODULES_END (END_MEM) 112 #define MODULES_VADDR PAGE_OFFSET 113 114 #define XIP_VIRT_ADDR(physaddr) (physaddr) 115 116 #endif /* !CONFIG_MMU */ 117 118 /* 119 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 120 * locations 121 */ 122 #ifdef CONFIG_HAVE_TCM 123 #define ITCM_OFFSET UL(0xfffe0000) 124 #define DTCM_OFFSET UL(0xfffe8000) 125 #endif 126 127 /* 128 * Convert a physical address to a Page Frame Number and back 129 */ 130 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 131 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 132 133 /* 134 * Convert a page to/from a physical address 135 */ 136 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 137 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 138 139 /* 140 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed 141 * around in head.S and proc-*.S are shifted by this amount, in order to 142 * leave spare high bits for systems with physical address extension. This 143 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but 144 * gives us about 38-bits or so. 145 */ 146 #ifdef CONFIG_ARM_LPAE 147 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT 148 #else 149 #define ARCH_PGD_SHIFT 0 150 #endif 151 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) 152 153 /* 154 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 155 * memory. This is used for XIP and NoMMU kernels, or by kernels which 156 * have their own mach/memory.h. Assembly code must always use 157 * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 158 */ 159 #ifndef PLAT_PHYS_OFFSET 160 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 161 #endif 162 163 #ifndef __ASSEMBLY__ 164 165 /* 166 * Physical vs virtual RAM address space conversion. These are 167 * private definitions which should NOT be used outside memory.h 168 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 169 */ 170 #ifndef __virt_to_phys 171 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT 172 173 /* 174 * Constants used to force the right instruction encodings and shifts 175 * so that all we need to do is modify the 8-bit constant field. 176 */ 177 #define __PV_BITS_31_24 0x81000000 178 #define __PV_BITS_7_0 0x81 179 180 extern u64 __pv_phys_offset; 181 extern u64 __pv_offset; 182 extern void fixup_pv_table(const void *, unsigned long); 183 extern const void *__pv_table_begin, *__pv_table_end; 184 185 #define PHYS_OFFSET __pv_phys_offset 186 187 #define __pv_stub(from,to,instr,type) \ 188 __asm__("@ __pv_stub\n" \ 189 "1: " instr " %0, %1, %2\n" \ 190 " .pushsection .pv_table,\"a\"\n" \ 191 " .long 1b\n" \ 192 " .popsection\n" \ 193 : "=r" (to) \ 194 : "r" (from), "I" (type)) 195 196 #define __pv_stub_mov_hi(t) \ 197 __asm__ volatile("@ __pv_stub_mov\n" \ 198 "1: mov %R0, %1\n" \ 199 " .pushsection .pv_table,\"a\"\n" \ 200 " .long 1b\n" \ 201 " .popsection\n" \ 202 : "=r" (t) \ 203 : "I" (__PV_BITS_7_0)) 204 205 #define __pv_add_carry_stub(x, y) \ 206 __asm__ volatile("@ __pv_add_carry_stub\n" \ 207 "1: adds %Q0, %1, %2\n" \ 208 " adc %R0, %R0, #0\n" \ 209 " .pushsection .pv_table,\"a\"\n" \ 210 " .long 1b\n" \ 211 " .popsection\n" \ 212 : "+r" (y) \ 213 : "r" (x), "I" (__PV_BITS_31_24) \ 214 : "cc") 215 216 static inline phys_addr_t __virt_to_phys(unsigned long x) 217 { 218 phys_addr_t t; 219 220 if (sizeof(phys_addr_t) == 4) { 221 __pv_stub(x, t, "add", __PV_BITS_31_24); 222 } else { 223 __pv_stub_mov_hi(t); 224 __pv_add_carry_stub(x, t); 225 } 226 return t; 227 } 228 229 static inline unsigned long __phys_to_virt(phys_addr_t x) 230 { 231 unsigned long t; 232 233 /* 234 * 'unsigned long' cast discard upper word when 235 * phys_addr_t is 64 bit, and makes sure that inline 236 * assembler expression receives 32 bit argument 237 * in place where 'r' 32 bit operand is expected. 238 */ 239 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 240 return t; 241 } 242 243 #else 244 245 #define PHYS_OFFSET PLAT_PHYS_OFFSET 246 247 static inline phys_addr_t __virt_to_phys(unsigned long x) 248 { 249 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 250 } 251 252 static inline unsigned long __phys_to_virt(phys_addr_t x) 253 { 254 return x - PHYS_OFFSET + PAGE_OFFSET; 255 } 256 257 #endif 258 #endif 259 260 /* 261 * PFNs are used to describe any physical page; this means 262 * PFN 0 == physical address 0. 263 * 264 * This is the PFN of the first RAM page in the kernel 265 * direct-mapped view. We assume this is the first page 266 * of RAM in the mem_map as well. 267 */ 268 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 269 270 /* 271 * These are *only* valid on the kernel direct mapped RAM memory. 272 * Note: Drivers should NOT use these. They are the wrong 273 * translation for translating DMA addresses. Use the driver 274 * DMA support - see dma-mapping.h. 275 */ 276 static inline phys_addr_t virt_to_phys(const volatile void *x) 277 { 278 return __virt_to_phys((unsigned long)(x)); 279 } 280 281 static inline void *phys_to_virt(phys_addr_t x) 282 { 283 return (void *)__phys_to_virt(x); 284 } 285 286 /* 287 * Drivers should NOT use these either. 288 */ 289 #define __pa(x) __virt_to_phys((unsigned long)(x)) 290 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 291 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 292 293 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); 294 295 /* 296 * These are for systems that have a hardware interconnect supported alias of 297 * physical memory for idmap purposes. Most cases should leave these 298 * untouched. 299 */ 300 static inline phys_addr_t __virt_to_idmap(unsigned long x) 301 { 302 if (arch_virt_to_idmap) 303 return arch_virt_to_idmap(x); 304 else 305 return __virt_to_phys(x); 306 } 307 308 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 309 310 /* 311 * Virtual <-> DMA view memory address translations 312 * Again, these are *only* valid on the kernel direct mapped RAM 313 * memory. Use of these is *deprecated* (and that doesn't mean 314 * use the __ prefixed forms instead.) See dma-mapping.h. 315 */ 316 #ifndef __virt_to_bus 317 #define __virt_to_bus __virt_to_phys 318 #define __bus_to_virt __phys_to_virt 319 #define __pfn_to_bus(x) __pfn_to_phys(x) 320 #define __bus_to_pfn(x) __phys_to_pfn(x) 321 #endif 322 323 #ifdef CONFIG_VIRT_TO_BUS 324 static inline __deprecated unsigned long virt_to_bus(void *x) 325 { 326 return __virt_to_bus((unsigned long)x); 327 } 328 329 static inline __deprecated void *bus_to_virt(unsigned long x) 330 { 331 return (void *)__bus_to_virt(x); 332 } 333 #endif 334 335 /* 336 * Conversion between a struct page and a physical address. 337 * 338 * page_to_pfn(page) convert a struct page * to a PFN number 339 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 340 * 341 * virt_to_page(k) convert a _valid_ virtual address to struct page * 342 * virt_addr_valid(k) indicates whether a virtual address is valid 343 */ 344 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 345 346 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 347 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 348 && pfn_valid(__pa(kaddr) >> PAGE_SHIFT) ) 349 350 #endif 351 352 #include <asm-generic/memory_model.h> 353 354 #endif 355