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#define XIP_VIRT_ADDR(physaddr) (physaddr) 120 121#endif /* !CONFIG_MMU */ 122 123/* 124 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 125 * locations 126 */ 127#ifdef CONFIG_HAVE_TCM 128#define ITCM_OFFSET UL(0xfffe0000) 129#define DTCM_OFFSET UL(0xfffe8000) 130#endif 131 132/* 133 * Convert a physical address to a Page Frame Number and back 134 */ 135#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 136#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 137 138/* 139 * Convert a page to/from a physical address 140 */ 141#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 142#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 143 144#ifndef __ASSEMBLY__ 145 146/* 147 * Physical vs virtual RAM address space conversion. These are 148 * private definitions which should NOT be used outside memory.h 149 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 150 */ 151#ifndef __virt_to_phys 152#ifdef CONFIG_ARM_PATCH_PHYS_VIRT 153 154/* 155 * Constants used to force the right instruction encodings and shifts 156 * so that all we need to do is modify the 8-bit constant field. 157 */ 158#define __PV_BITS_31_24 0x81000000 159 160extern unsigned long __pv_phys_offset; 161#define PHYS_OFFSET __pv_phys_offset 162 163#define __pv_stub(from,to,instr,type) \ 164 __asm__("@ __pv_stub\n" \ 165 "1: " instr " %0, %1, %2\n" \ 166 " .pushsection .pv_table,\"a\"\n" \ 167 " .long 1b\n" \ 168 " .popsection\n" \ 169 : "=r" (to) \ 170 : "r" (from), "I" (type)) 171 172static inline unsigned long __virt_to_phys(unsigned long x) 173{ 174 unsigned long t; 175 __pv_stub(x, t, "add", __PV_BITS_31_24); 176 return t; 177} 178 179static inline unsigned long __phys_to_virt(unsigned long x) 180{ 181 unsigned long t; 182 __pv_stub(x, t, "sub", __PV_BITS_31_24); 183 return t; 184} 185#else 186#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 187#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 188#endif 189#endif 190 191#ifndef PHYS_OFFSET 192#ifdef PLAT_PHYS_OFFSET 193#define PHYS_OFFSET PLAT_PHYS_OFFSET 194#else 195#define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 196#endif 197#endif 198 199/* 200 * PFNs are used to describe any physical page; this means 201 * PFN 0 == physical address 0. 202 * 203 * This is the PFN of the first RAM page in the kernel 204 * direct-mapped view. We assume this is the first page 205 * of RAM in the mem_map as well. 206 */ 207#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 208 209/* 210 * These are *only* valid on the kernel direct mapped RAM memory. 211 * Note: Drivers should NOT use these. They are the wrong 212 * translation for translating DMA addresses. Use the driver 213 * DMA support - see dma-mapping.h. 214 */ 215static inline phys_addr_t virt_to_phys(const volatile void *x) 216{ 217 return __virt_to_phys((unsigned long)(x)); 218} 219 220static inline void *phys_to_virt(phys_addr_t x) 221{ 222 return (void *)(__phys_to_virt((unsigned long)(x))); 223} 224 225/* 226 * Drivers should NOT use these either. 227 */ 228#define __pa(x) __virt_to_phys((unsigned long)(x)) 229#define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 230#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 231 232/* 233 * Virtual <-> DMA view memory address translations 234 * Again, these are *only* valid on the kernel direct mapped RAM 235 * memory. Use of these is *deprecated* (and that doesn't mean 236 * use the __ prefixed forms instead.) See dma-mapping.h. 237 */ 238#ifndef __virt_to_bus 239#define __virt_to_bus __virt_to_phys 240#define __bus_to_virt __phys_to_virt 241#define __pfn_to_bus(x) __pfn_to_phys(x) 242#define __bus_to_pfn(x) __phys_to_pfn(x) 243#endif 244 245static inline __deprecated unsigned long virt_to_bus(void *x) 246{ 247 return __virt_to_bus((unsigned long)x); 248} 249 250static inline __deprecated void *bus_to_virt(unsigned long x) 251{ 252 return (void *)__bus_to_virt(x); 253} 254 255/* 256 * Conversion between a struct page and a physical address. 257 * 258 * Note: when converting an unknown physical address to a 259 * struct page, the resulting pointer must be validated 260 * using VALID_PAGE(). It must return an invalid struct page 261 * for any physical address not corresponding to a system 262 * RAM address. 263 * 264 * page_to_pfn(page) convert a struct page * to a PFN number 265 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 266 * 267 * virt_to_page(k) convert a _valid_ virtual address to struct page * 268 * virt_addr_valid(k) indicates whether a virtual address is valid 269 */ 270#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 271 272#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 273#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 274 275/* 276 * Optional coherency support. Currently used only by selected 277 * Intel XSC3-based systems. 278 */ 279#ifndef arch_is_coherent 280#define arch_is_coherent() 0 281#endif 282 283#endif 284 285#include <asm-generic/memory_model.h> 286 287#endif 288