Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Russell King | 4baa992 | 2008-08-02 10:55:55 +0100 | [diff] [blame] | 2 | * arch/arm/include/asm/memory.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2000-2002 Russell King |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 5 | * modification for nommu, Hyok S. Choi, 2004 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Lennert Buytenhek | 8d5796d | 2008-08-25 21:03:32 +0100 | [diff] [blame] | 16 | #include <linux/compiler.h> |
| 17 | #include <linux/const.h> |
Will Deacon | 3a6b167 | 2011-02-15 17:28:28 +0100 | [diff] [blame] | 18 | #include <linux/types.h> |
Lennert Buytenhek | 8d5796d | 2008-08-25 21:03:32 +0100 | [diff] [blame] | 19 | #include <asm/sizes.h> |
| 20 | |
Nicolas Pitre | 0cdc8b9 | 2011-09-02 22:26:55 -0400 | [diff] [blame] | 21 | #ifdef CONFIG_NEED_MACH_MEMORY_H |
Nicolas Pitre | 1b9f95f | 2011-07-05 22:52:51 -0400 | [diff] [blame] | 22 | #include <mach/memory.h> |
| 23 | #endif |
| 24 | |
Nicolas Pitre | f09b997 | 2005-10-29 21:44:55 +0100 | [diff] [blame] | 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 | */ |
Lennert Buytenhek | 8d5796d | 2008-08-25 21:03:32 +0100 | [diff] [blame] | 29 | #define UL(x) _AC(x, UL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 31 | #ifdef CONFIG_MMU |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | /* |
Lennert Buytenhek | 8d5796d | 2008-08-25 21:03:32 +0100 | [diff] [blame] | 34 | * PAGE_OFFSET - the virtual address of the start of the kernel image |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | * TASK_SIZE - the maximum size of a user space task. |
| 36 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area |
| 37 | */ |
Lennert Buytenhek | 8d5796d | 2008-08-25 21:03:32 +0100 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | /* |
| 43 | * The maximum size of a 26-bit user space task. |
| 44 | */ |
Nicolas Pitre | f09b997 | 2005-10-29 21:44:55 +0100 | [diff] [blame] | 45 | #define TASK_SIZE_26 UL(0x04000000) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | /* |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 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 | */ |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 51 | #ifndef CONFIG_THUMB2_KERNEL |
Nicolas Pitre | d73cd42 | 2008-09-15 16:44:55 -0400 | [diff] [blame] | 52 | #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 53 | #else |
| 54 | /* smaller range for Thumb-2 symbols relocation (2^24)*/ |
| 55 | #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) |
| 56 | #endif |
| 57 | |
Russell King | ab4f2ee | 2008-11-06 17:11:07 +0000 | [diff] [blame] | 58 | #if TASK_SIZE > MODULES_VADDR |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 59 | #error Top of user space clashes with start of module space |
| 60 | #endif |
| 61 | |
| 62 | /* |
Nicolas Pitre | d73cd42 | 2008-09-15 16:44:55 -0400 | [diff] [blame] | 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 | /* |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 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 | */ |
Russell King | ab4f2ee | 2008-11-06 17:11:07 +0000 | [diff] [blame] | 76 | #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 77 | |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 78 | /* |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 79 | * Allow 16MB-aligned ioremap pages |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 80 | */ |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 81 | #define IOREMAP_MAX_ORDER 24 |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 82 | |
Fenkart/Bostandzhyan | a7bd08c | 2010-02-07 21:46:33 +0100 | [diff] [blame] | 83 | #define CONSISTENT_END (0xffe00000UL) |
Fenkart/Bostandzhyan | a7bd08c | 2010-02-07 21:46:33 +0100 | [diff] [blame] | 84 | |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 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 |
Fenkart/Bostandzhyan | c931b4f | 2010-02-07 21:47:17 +0100 | [diff] [blame] | 102 | #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 103 | #endif |
| 104 | |
| 105 | #ifndef END_MEM |
Fenkart/Bostandzhyan | c931b4f | 2010-02-07 21:47:17 +0100 | [diff] [blame] | 106 | #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 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 | */ |
Russell King | ab4f2ee | 2008-11-06 17:11:07 +0000 | [diff] [blame] | 116 | #define MODULES_END (END_MEM) |
| 117 | #define MODULES_VADDR (PHYS_OFFSET) |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 118 | |
| 119 | #endif /* !CONFIG_MMU */ |
| 120 | |
| 121 | /* |
Linus Walleij | 1dbd30e | 2010-07-12 21:53:28 +0100 | [diff] [blame] | 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 | /* |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 131 | * Convert a physical address to a Page Frame Number and back |
| 132 | */ |
Will Deacon | 3a6b167 | 2011-02-15 17:28:28 +0100 | [diff] [blame] | 133 | #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) |
| 134 | #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 135 | |
Russell King | 719301f | 2009-10-31 17:51:57 +0000 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | #ifndef __ASSEMBLY__ |
| 143 | |
| 144 | /* |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 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 | |
Russell King | cada3c0 | 2011-01-04 19:39:29 +0000 | [diff] [blame] | 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 |
Russell King | cada3c0 | 2011-01-04 19:39:29 +0000 | [diff] [blame] | 157 | |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 158 | extern unsigned long __pv_phys_offset; |
| 159 | #define PHYS_OFFSET __pv_phys_offset |
| 160 | |
Russell King | cada3c0 | 2011-01-04 19:39:29 +0000 | [diff] [blame] | 161 | #define __pv_stub(from,to,instr,type) \ |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 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) \ |
Russell King | cada3c0 | 2011-01-04 19:39:29 +0000 | [diff] [blame] | 168 | : "r" (from), "I" (type)) |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 169 | |
| 170 | static inline unsigned long __virt_to_phys(unsigned long x) |
| 171 | { |
| 172 | unsigned long t; |
Russell King | cada3c0 | 2011-01-04 19:39:29 +0000 | [diff] [blame] | 173 | __pv_stub(x, t, "add", __PV_BITS_31_24); |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 174 | return t; |
| 175 | } |
| 176 | |
| 177 | static inline unsigned long __phys_to_virt(unsigned long x) |
| 178 | { |
| 179 | unsigned long t; |
Russell King | cada3c0 | 2011-01-04 19:39:29 +0000 | [diff] [blame] | 180 | __pv_stub(x, t, "sub", __PV_BITS_31_24); |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 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 |
Nicolas Pitre | 1b9f95f | 2011-07-05 22:52:51 -0400 | [diff] [blame] | 190 | #ifdef PLAT_PHYS_OFFSET |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 191 | #define PHYS_OFFSET PLAT_PHYS_OFFSET |
Nicolas Pitre | 1b9f95f | 2011-07-05 22:52:51 -0400 | [diff] [blame] | 192 | #else |
| 193 | #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) |
| 194 | #endif |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 195 | #endif |
| 196 | |
| 197 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Will Deacon | 3a6b167 | 2011-02-15 17:28:28 +0100 | [diff] [blame] | 213 | static inline phys_addr_t virt_to_phys(const volatile void *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
| 215 | return __virt_to_phys((unsigned long)(x)); |
| 216 | } |
| 217 | |
Will Deacon | 3a6b167 | 2011-02-15 17:28:28 +0100 | [diff] [blame] | 218 | static inline void *phys_to_virt(phys_addr_t x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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))) |
Hiroki Kaminaga | 31a5539 | 2005-12-05 10:55:00 +0000 | [diff] [blame] | 228 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Nicolas Pitre | b5ee900 | 2008-09-05 21:53:30 -0400 | [diff] [blame] | 236 | #ifndef __virt_to_bus |
| 237 | #define __virt_to_bus __virt_to_phys |
| 238 | #define __bus_to_virt __phys_to_virt |
Russell King | 1c4a4f4 | 2009-10-31 15:58:30 +0000 | [diff] [blame] | 239 | #define __pfn_to_bus(x) __pfn_to_phys(x) |
| 240 | #define __bus_to_pfn(x) __phys_to_pfn(x) |
Nicolas Pitre | b5ee900 | 2008-09-05 21:53:30 -0400 | [diff] [blame] | 241 | #endif |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Russell King | 7d12963 | 2006-04-04 16:25:47 +0100 | [diff] [blame] | 268 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
Russell King | 05944d7 | 2006-11-30 20:43:51 +0000 | [diff] [blame] | 269 | |
Russell King | 7d12963 | 2006-04-04 16:25:47 +0100 | [diff] [blame] | 270 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
| 272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | /* |
Lennert Buytenhek | 23759dc | 2006-04-02 00:07:39 +0100 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | #endif |
| 282 | |
KAMEZAWA Hiroyuki | 7eb98a2 | 2006-03-27 01:15:37 -0800 | [diff] [blame] | 283 | #include <asm-generic/memory_model.h> |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | #endif |