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 PHYS_OFFSET 104 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) 105 #endif 106 107 #ifndef END_MEM 108 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 109 #endif 110 111 #ifndef PAGE_OFFSET 112 #define PAGE_OFFSET (PHYS_OFFSET) 113 #endif 114 115 /* 116 * The module can be at any place in ram in nommu mode. 117 */ 118 #define MODULES_END (END_MEM) 119 #define MODULES_VADDR (PHYS_OFFSET) 120 121 #define XIP_VIRT_ADDR(physaddr) (physaddr) 122 123 #endif /* !CONFIG_MMU */ 124 125 /* 126 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 127 * locations 128 */ 129 #ifdef CONFIG_HAVE_TCM 130 #define ITCM_OFFSET UL(0xfffe0000) 131 #define DTCM_OFFSET UL(0xfffe8000) 132 #endif 133 134 /* 135 * Convert a physical address to a Page Frame Number and back 136 */ 137 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 138 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 139 140 /* 141 * Convert a page to/from a physical address 142 */ 143 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 144 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 145 146 /* 147 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed 148 * around in head.S and proc-*.S are shifted by this amount, in order to 149 * leave spare high bits for systems with physical address extension. This 150 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but 151 * gives us about 38-bits or so. 152 */ 153 #ifdef CONFIG_ARM_LPAE 154 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT 155 #else 156 #define ARCH_PGD_SHIFT 0 157 #endif 158 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) 159 160 #ifndef __ASSEMBLY__ 161 162 /* 163 * Physical vs virtual RAM address space conversion. These are 164 * private definitions which should NOT be used outside memory.h 165 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 166 */ 167 #ifndef __virt_to_phys 168 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT 169 170 /* 171 * Constants used to force the right instruction encodings and shifts 172 * so that all we need to do is modify the 8-bit constant field. 173 */ 174 #define __PV_BITS_31_24 0x81000000 175 176 extern unsigned long __pv_phys_offset; 177 #define PHYS_OFFSET __pv_phys_offset 178 179 #define __pv_stub(from,to,instr,type) \ 180 __asm__("@ __pv_stub\n" \ 181 "1: " instr " %0, %1, %2\n" \ 182 " .pushsection .pv_table,\"a\"\n" \ 183 " .long 1b\n" \ 184 " .popsection\n" \ 185 : "=r" (to) \ 186 : "r" (from), "I" (type)) 187 188 static inline unsigned long __virt_to_phys(unsigned long x) 189 { 190 unsigned long t; 191 __pv_stub(x, t, "add", __PV_BITS_31_24); 192 return t; 193 } 194 195 static inline unsigned long __phys_to_virt(unsigned long x) 196 { 197 unsigned long t; 198 __pv_stub(x, t, "sub", __PV_BITS_31_24); 199 return t; 200 } 201 #else 202 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 203 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 204 #endif 205 #endif 206 #endif /* __ASSEMBLY__ */ 207 208 #ifndef PHYS_OFFSET 209 #ifdef PLAT_PHYS_OFFSET 210 #define PHYS_OFFSET PLAT_PHYS_OFFSET 211 #else 212 #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 213 #endif 214 #endif 215 216 #ifndef __ASSEMBLY__ 217 218 /* 219 * PFNs are used to describe any physical page; this means 220 * PFN 0 == physical address 0. 221 * 222 * This is the PFN of the first RAM page in the kernel 223 * direct-mapped view. We assume this is the first page 224 * of RAM in the mem_map as well. 225 */ 226 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 227 228 /* 229 * These are *only* valid on the kernel direct mapped RAM memory. 230 * Note: Drivers should NOT use these. They are the wrong 231 * translation for translating DMA addresses. Use the driver 232 * DMA support - see dma-mapping.h. 233 */ 234 static inline phys_addr_t virt_to_phys(const volatile void *x) 235 { 236 return __virt_to_phys((unsigned long)(x)); 237 } 238 239 static inline void *phys_to_virt(phys_addr_t x) 240 { 241 return (void *)(__phys_to_virt((unsigned long)(x))); 242 } 243 244 /* 245 * Drivers should NOT use these either. 246 */ 247 #define __pa(x) __virt_to_phys((unsigned long)(x)) 248 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 249 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 250 251 /* 252 * Virtual <-> DMA view memory address translations 253 * Again, these are *only* valid on the kernel direct mapped RAM 254 * memory. Use of these is *deprecated* (and that doesn't mean 255 * use the __ prefixed forms instead.) See dma-mapping.h. 256 */ 257 #ifndef __virt_to_bus 258 #define __virt_to_bus __virt_to_phys 259 #define __bus_to_virt __phys_to_virt 260 #define __pfn_to_bus(x) __pfn_to_phys(x) 261 #define __bus_to_pfn(x) __phys_to_pfn(x) 262 #endif 263 264 #ifdef CONFIG_VIRT_TO_BUS 265 static inline __deprecated unsigned long virt_to_bus(void *x) 266 { 267 return __virt_to_bus((unsigned long)x); 268 } 269 270 static inline __deprecated void *bus_to_virt(unsigned long x) 271 { 272 return (void *)__bus_to_virt(x); 273 } 274 #endif 275 276 /* 277 * Conversion between a struct page and a physical address. 278 * 279 * page_to_pfn(page) convert a struct page * to a PFN number 280 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 281 * 282 * virt_to_page(k) convert a _valid_ virtual address to struct page * 283 * virt_addr_valid(k) indicates whether a virtual address is valid 284 */ 285 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 286 287 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 288 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 289 290 #endif 291 292 #include <asm-generic/memory_model.h> 293 294 #endif 295