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 <asm/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 #ifdef CONFIG_MMU 32 33 /* 34 * PAGE_OFFSET - the virtual address of the start of the kernel image 35 * TASK_SIZE - the maximum size of a user space task. 36 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 37 */ 38 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 39 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) 40 #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) 41 42 /* 43 * The maximum size of a 26-bit user space task. 44 */ 45 #define TASK_SIZE_26 UL(0x04000000) 46 47 /* 48 * The module space lives between the addresses given by TASK_SIZE 49 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 50 */ 51 #ifndef CONFIG_THUMB2_KERNEL 52 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) 53 #else 54 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 55 #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) 56 #endif 57 58 #if TASK_SIZE > MODULES_VADDR 59 #error Top of user space clashes with start of module space 60 #endif 61 62 /* 63 * The highmem pkmap virtual space shares the end of the module area. 64 */ 65 #ifdef CONFIG_HIGHMEM 66 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 67 #else 68 #define MODULES_END (PAGE_OFFSET) 69 #endif 70 71 /* 72 * The XIP kernel gets mapped at the bottom of the module vm area. 73 * Since we use sections to map it, this macro replaces the physical address 74 * with its virtual address while keeping offset from the base section. 75 */ 76 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 77 78 /* 79 * Allow 16MB-aligned ioremap pages 80 */ 81 #define IOREMAP_MAX_ORDER 24 82 83 #define CONSISTENT_END (0xffe00000UL) 84 85 #else /* CONFIG_MMU */ 86 87 /* 88 * The limitation of user task size can grow up to the end of free ram region. 89 * It is difficult to define and perhaps will never meet the original meaning 90 * of this define that was meant to. 91 * Fortunately, there is no reference for this in noMMU mode, for now. 92 */ 93 #ifndef TASK_SIZE 94 #define TASK_SIZE (CONFIG_DRAM_SIZE) 95 #endif 96 97 #ifndef TASK_UNMAPPED_BASE 98 #define TASK_UNMAPPED_BASE UL(0x00000000) 99 #endif 100 101 #ifndef PHYS_OFFSET 102 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) 103 #endif 104 105 #ifndef END_MEM 106 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 107 #endif 108 109 #ifndef PAGE_OFFSET 110 #define PAGE_OFFSET (PHYS_OFFSET) 111 #endif 112 113 /* 114 * The module can be at any place in ram in nommu mode. 115 */ 116 #define MODULES_END (END_MEM) 117 #define MODULES_VADDR (PHYS_OFFSET) 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 #ifndef __ASSEMBLY__ 143 144 /* 145 * Physical vs virtual RAM address space conversion. These are 146 * private definitions which should NOT be used outside memory.h 147 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 148 */ 149 #ifndef __virt_to_phys 150 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT 151 152 /* 153 * Constants used to force the right instruction encodings and shifts 154 * so that all we need to do is modify the 8-bit constant field. 155 */ 156 #define __PV_BITS_31_24 0x81000000 157 158 extern unsigned long __pv_phys_offset; 159 #define PHYS_OFFSET __pv_phys_offset 160 161 #define __pv_stub(from,to,instr,type) \ 162 __asm__("@ __pv_stub\n" \ 163 "1: " instr " %0, %1, %2\n" \ 164 " .pushsection .pv_table,\"a\"\n" \ 165 " .long 1b\n" \ 166 " .popsection\n" \ 167 : "=r" (to) \ 168 : "r" (from), "I" (type)) 169 170 static inline unsigned long __virt_to_phys(unsigned long x) 171 { 172 unsigned long t; 173 __pv_stub(x, t, "add", __PV_BITS_31_24); 174 return t; 175 } 176 177 static inline unsigned long __phys_to_virt(unsigned long x) 178 { 179 unsigned long t; 180 __pv_stub(x, t, "sub", __PV_BITS_31_24); 181 return t; 182 } 183 #else 184 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 185 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 186 #endif 187 #endif 188 189 #ifndef PHYS_OFFSET 190 #ifdef PLAT_PHYS_OFFSET 191 #define PHYS_OFFSET PLAT_PHYS_OFFSET 192 #else 193 #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 194 #endif 195 #endif 196 197 /* 198 * PFNs are used to describe any physical page; this means 199 * PFN 0 == physical address 0. 200 * 201 * This is the PFN of the first RAM page in the kernel 202 * direct-mapped view. We assume this is the first page 203 * of RAM in the mem_map as well. 204 */ 205 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 206 207 /* 208 * These are *only* valid on the kernel direct mapped RAM memory. 209 * Note: Drivers should NOT use these. They are the wrong 210 * translation for translating DMA addresses. Use the driver 211 * DMA support - see dma-mapping.h. 212 */ 213 static inline phys_addr_t virt_to_phys(const volatile void *x) 214 { 215 return __virt_to_phys((unsigned long)(x)); 216 } 217 218 static inline void *phys_to_virt(phys_addr_t x) 219 { 220 return (void *)(__phys_to_virt((unsigned long)(x))); 221 } 222 223 /* 224 * Drivers should NOT use these either. 225 */ 226 #define __pa(x) __virt_to_phys((unsigned long)(x)) 227 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 228 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 229 230 /* 231 * Virtual <-> DMA view memory address translations 232 * Again, these are *only* valid on the kernel direct mapped RAM 233 * memory. Use of these is *deprecated* (and that doesn't mean 234 * use the __ prefixed forms instead.) See dma-mapping.h. 235 */ 236 #ifndef __virt_to_bus 237 #define __virt_to_bus __virt_to_phys 238 #define __bus_to_virt __phys_to_virt 239 #define __pfn_to_bus(x) __pfn_to_phys(x) 240 #define __bus_to_pfn(x) __phys_to_pfn(x) 241 #endif 242 243 static inline __deprecated unsigned long virt_to_bus(void *x) 244 { 245 return __virt_to_bus((unsigned long)x); 246 } 247 248 static inline __deprecated void *bus_to_virt(unsigned long x) 249 { 250 return (void *)__bus_to_virt(x); 251 } 252 253 /* 254 * Conversion between a struct page and a physical address. 255 * 256 * Note: when converting an unknown physical address to a 257 * struct page, the resulting pointer must be validated 258 * using VALID_PAGE(). It must return an invalid struct page 259 * for any physical address not corresponding to a system 260 * RAM address. 261 * 262 * page_to_pfn(page) convert a struct page * to a PFN number 263 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 264 * 265 * virt_to_page(k) convert a _valid_ virtual address to struct page * 266 * virt_addr_valid(k) indicates whether a virtual address is valid 267 */ 268 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 269 270 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 271 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 272 273 /* 274 * Optional coherency support. Currently used only by selected 275 * Intel XSC3-based systems. 276 */ 277 #ifndef arch_is_coherent 278 #define arch_is_coherent() 0 279 #endif 280 281 #endif 282 283 #include <asm-generic/memory_model.h> 284 285 #endif 286