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 <mach/memory.h> 19 #include <asm/sizes.h> 20 21 /* 22 * Allow for constants defined here to be used from assembly code 23 * by prepending the UL suffix only with actual C code compilation. 24 */ 25 #define UL(x) _AC(x, UL) 26 27 #ifdef CONFIG_MMU 28 29 /* 30 * PAGE_OFFSET - the virtual address of the start of the kernel image 31 * TASK_SIZE - the maximum size of a user space task. 32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 33 */ 34 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 35 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) 36 #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) 37 38 /* 39 * The maximum size of a 26-bit user space task. 40 */ 41 #define TASK_SIZE_26 UL(0x04000000) 42 43 /* 44 * The module space lives between the addresses given by TASK_SIZE 45 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 46 */ 47 #ifndef CONFIG_THUMB2_KERNEL 48 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) 49 #else 50 /* smaller range for Thumb-2 symbols relocation (2^24)*/ 51 #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) 52 #endif 53 54 #if TASK_SIZE > MODULES_VADDR 55 #error Top of user space clashes with start of module space 56 #endif 57 58 /* 59 * The highmem pkmap virtual space shares the end of the module area. 60 */ 61 #ifdef CONFIG_HIGHMEM 62 #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 63 #else 64 #define MODULES_END (PAGE_OFFSET) 65 #endif 66 67 /* 68 * The XIP kernel gets mapped at the bottom of the module vm area. 69 * Since we use sections to map it, this macro replaces the physical address 70 * with its virtual address while keeping offset from the base section. 71 */ 72 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 73 74 /* 75 * Allow 16MB-aligned ioremap pages 76 */ 77 #define IOREMAP_MAX_ORDER 24 78 79 /* 80 * Size of DMA-consistent memory region. Must be multiple of 2M, 81 * between 2MB and 14MB inclusive. 82 */ 83 #ifndef CONSISTENT_DMA_SIZE 84 #define CONSISTENT_DMA_SIZE SZ_2M 85 #endif 86 87 #define CONSISTENT_END (0xffe00000UL) 88 #define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE) 89 90 #else /* CONFIG_MMU */ 91 92 /* 93 * The limitation of user task size can grow up to the end of free ram region. 94 * It is difficult to define and perhaps will never meet the original meaning 95 * of this define that was meant to. 96 * Fortunately, there is no reference for this in noMMU mode, for now. 97 */ 98 #ifndef TASK_SIZE 99 #define TASK_SIZE (CONFIG_DRAM_SIZE) 100 #endif 101 102 #ifndef TASK_UNMAPPED_BASE 103 #define TASK_UNMAPPED_BASE UL(0x00000000) 104 #endif 105 106 #ifndef PHYS_OFFSET 107 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) 108 #endif 109 110 #ifndef END_MEM 111 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 112 #endif 113 114 #ifndef PAGE_OFFSET 115 #define PAGE_OFFSET (PHYS_OFFSET) 116 #endif 117 118 /* 119 * The module can be at any place in ram in nommu mode. 120 */ 121 #define MODULES_END (END_MEM) 122 #define MODULES_VADDR (PHYS_OFFSET) 123 124 #endif /* !CONFIG_MMU */ 125 126 /* 127 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 128 * locations 129 */ 130 #ifdef CONFIG_HAVE_TCM 131 #define ITCM_OFFSET UL(0xfffe0000) 132 #define DTCM_OFFSET UL(0xfffe8000) 133 #endif 134 135 /* 136 * Physical vs virtual RAM address space conversion. These are 137 * private definitions which should NOT be used outside memory.h 138 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 139 */ 140 #ifndef __virt_to_phys 141 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 142 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 143 #endif 144 145 /* 146 * Convert a physical address to a Page Frame Number and back 147 */ 148 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) 149 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 150 151 /* 152 * Convert a page to/from a physical address 153 */ 154 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 155 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 156 157 #ifndef __ASSEMBLY__ 158 159 /* 160 * The DMA mask corresponding to the maximum bus address allocatable 161 * using GFP_DMA. The default here places no restriction on DMA 162 * allocations. This must be the smallest DMA mask in the system, 163 * so a successful GFP_DMA allocation will always satisfy this. 164 */ 165 #ifndef ISA_DMA_THRESHOLD 166 #define ISA_DMA_THRESHOLD (0xffffffffULL) 167 #endif 168 169 #ifndef arch_adjust_zones 170 #define arch_adjust_zones(size,holes) do { } while (0) 171 #elif !defined(CONFIG_ZONE_DMA) 172 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" 173 #endif 174 175 /* 176 * PFNs are used to describe any physical page; this means 177 * PFN 0 == physical address 0. 178 * 179 * This is the PFN of the first RAM page in the kernel 180 * direct-mapped view. We assume this is the first page 181 * of RAM in the mem_map as well. 182 */ 183 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 184 185 /* 186 * These are *only* valid on the kernel direct mapped RAM memory. 187 * Note: Drivers should NOT use these. They are the wrong 188 * translation for translating DMA addresses. Use the driver 189 * DMA support - see dma-mapping.h. 190 */ 191 static inline unsigned long virt_to_phys(void *x) 192 { 193 return __virt_to_phys((unsigned long)(x)); 194 } 195 196 static inline void *phys_to_virt(unsigned long x) 197 { 198 return (void *)(__phys_to_virt((unsigned long)(x))); 199 } 200 201 /* 202 * Drivers should NOT use these either. 203 */ 204 #define __pa(x) __virt_to_phys((unsigned long)(x)) 205 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 206 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 207 208 /* 209 * Virtual <-> DMA view memory address translations 210 * Again, these are *only* valid on the kernel direct mapped RAM 211 * memory. Use of these is *deprecated* (and that doesn't mean 212 * use the __ prefixed forms instead.) See dma-mapping.h. 213 */ 214 #ifndef __virt_to_bus 215 #define __virt_to_bus __virt_to_phys 216 #define __bus_to_virt __phys_to_virt 217 #define __pfn_to_bus(x) __pfn_to_phys(x) 218 #define __bus_to_pfn(x) __phys_to_pfn(x) 219 #endif 220 221 static inline __deprecated unsigned long virt_to_bus(void *x) 222 { 223 return __virt_to_bus((unsigned long)x); 224 } 225 226 static inline __deprecated void *bus_to_virt(unsigned long x) 227 { 228 return (void *)__bus_to_virt(x); 229 } 230 231 /* 232 * Conversion between a struct page and a physical address. 233 * 234 * Note: when converting an unknown physical address to a 235 * struct page, the resulting pointer must be validated 236 * using VALID_PAGE(). It must return an invalid struct page 237 * for any physical address not corresponding to a system 238 * RAM address. 239 * 240 * page_to_pfn(page) convert a struct page * to a PFN number 241 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 242 * 243 * virt_to_page(k) convert a _valid_ virtual address to struct page * 244 * virt_addr_valid(k) indicates whether a virtual address is valid 245 */ 246 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 247 248 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 249 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 250 251 /* 252 * Optional coherency support. Currently used only by selected 253 * Intel XSC3-based systems. 254 */ 255 #ifndef arch_is_coherent 256 #define arch_is_coherent() 0 257 #endif 258 259 #endif 260 261 #include <asm-generic/memory_model.h> 262 263 #endif 264