linux/arch/arm/include/asm/memory.h
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   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 <mach/memory.h>
  20#include <asm/sizes.h>
  21
  22/*
  23 * Allow for constants defined here to be used from assembly code
  24 * by prepending the UL suffix only with actual C code compilation.
  25 */
  26#define UL(x) _AC(x, UL)
  27
  28#ifdef CONFIG_MMU
  29
  30/*
  31 * PAGE_OFFSET - the virtual address of the start of the kernel image
  32 * TASK_SIZE - the maximum size of a user space task.
  33 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  34 */
  35#define PAGE_OFFSET             UL(CONFIG_PAGE_OFFSET)
  36#define TASK_SIZE               (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
  37#define TASK_UNMAPPED_BASE      (UL(CONFIG_PAGE_OFFSET) / 3)
  38
  39/*
  40 * The maximum size of a 26-bit user space task.
  41 */
  42#define TASK_SIZE_26            UL(0x04000000)
  43
  44/*
  45 * The module space lives between the addresses given by TASK_SIZE
  46 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  47 */
  48#ifndef CONFIG_THUMB2_KERNEL
  49#define MODULES_VADDR           (PAGE_OFFSET - 16*1024*1024)
  50#else
  51/* smaller range for Thumb-2 symbols relocation (2^24)*/
  52#define MODULES_VADDR           (PAGE_OFFSET - 8*1024*1024)
  53#endif
  54
  55#if TASK_SIZE > MODULES_VADDR
  56#error Top of user space clashes with start of module space
  57#endif
  58
  59/*
  60 * The highmem pkmap virtual space shares the end of the module area.
  61 */
  62#ifdef CONFIG_HIGHMEM
  63#define MODULES_END             (PAGE_OFFSET - PMD_SIZE)
  64#else
  65#define MODULES_END             (PAGE_OFFSET)
  66#endif
  67
  68/*
  69 * The XIP kernel gets mapped at the bottom of the module vm area.
  70 * Since we use sections to map it, this macro replaces the physical address
  71 * with its virtual address while keeping offset from the base section.
  72 */
  73#define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
  74
  75/*
  76 * Allow 16MB-aligned ioremap pages
  77 */
  78#define IOREMAP_MAX_ORDER       24
  79
  80/*
  81 * Size of DMA-consistent memory region.  Must be multiple of 2M,
  82 * between 2MB and 14MB inclusive.
  83 */
  84#ifndef CONSISTENT_DMA_SIZE
  85#define CONSISTENT_DMA_SIZE     SZ_2M
  86#endif
  87
  88#define CONSISTENT_END          (0xffe00000UL)
  89#define CONSISTENT_BASE         (CONSISTENT_END - CONSISTENT_DMA_SIZE)
  90
  91#else /* CONFIG_MMU */
  92
  93/*
  94 * The limitation of user task size can grow up to the end of free ram region.
  95 * It is difficult to define and perhaps will never meet the original meaning
  96 * of this define that was meant to.
  97 * Fortunately, there is no reference for this in noMMU mode, for now.
  98 */
  99#ifndef TASK_SIZE
 100#define TASK_SIZE               (CONFIG_DRAM_SIZE)
 101#endif
 102
 103#ifndef TASK_UNMAPPED_BASE
 104#define TASK_UNMAPPED_BASE      UL(0x00000000)
 105#endif
 106
 107#ifndef PHYS_OFFSET
 108#define PHYS_OFFSET             UL(CONFIG_DRAM_BASE)
 109#endif
 110
 111#ifndef END_MEM
 112#define END_MEM                 (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
 113#endif
 114
 115#ifndef PAGE_OFFSET
 116#define PAGE_OFFSET             (PHYS_OFFSET)
 117#endif
 118
 119/*
 120 * The module can be at any place in ram in nommu mode.
 121 */
 122#define MODULES_END             (END_MEM)
 123#define MODULES_VADDR           (PHYS_OFFSET)
 124
 125#endif /* !CONFIG_MMU */
 126
 127/*
 128 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
 129 * locations
 130 */
 131#ifdef CONFIG_HAVE_TCM
 132#define ITCM_OFFSET     UL(0xfffe0000)
 133#define DTCM_OFFSET     UL(0xfffe8000)
 134#endif
 135
 136/*
 137 * Convert a physical address to a Page Frame Number and back
 138 */
 139#define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
 140#define __pfn_to_phys(pfn)      ((phys_addr_t)(pfn) << PAGE_SHIFT)
 141
 142/*
 143 * Convert a page to/from a physical address
 144 */
 145#define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
 146#define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
 147
 148#ifndef __ASSEMBLY__
 149
 150/*
 151 * Physical vs virtual RAM address space conversion.  These are
 152 * private definitions which should NOT be used outside memory.h
 153 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 154 */
 155#ifndef __virt_to_phys
 156#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
 157
 158/*
 159 * Constants used to force the right instruction encodings and shifts
 160 * so that all we need to do is modify the 8-bit constant field.
 161 */
 162#define __PV_BITS_31_24 0x81000000
 163#define __PV_BITS_23_16 0x00810000
 164
 165extern unsigned long __pv_phys_offset;
 166#define PHYS_OFFSET __pv_phys_offset
 167
 168#define __pv_stub(from,to,instr,type)                   \
 169        __asm__("@ __pv_stub\n"                         \
 170        "1:     " instr "       %0, %1, %2\n"           \
 171        "       .pushsection .pv_table,\"a\"\n"         \
 172        "       .long   1b\n"                           \
 173        "       .popsection\n"                          \
 174        : "=r" (to)                                     \
 175        : "r" (from), "I" (type))
 176
 177static inline unsigned long __virt_to_phys(unsigned long x)
 178{
 179        unsigned long t;
 180        __pv_stub(x, t, "add", __PV_BITS_31_24);
 181#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
 182        __pv_stub(t, t, "add", __PV_BITS_23_16);
 183#endif
 184        return t;
 185}
 186
 187static inline unsigned long __phys_to_virt(unsigned long x)
 188{
 189        unsigned long t;
 190        __pv_stub(x, t, "sub", __PV_BITS_31_24);
 191#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
 192        __pv_stub(t, t, "sub", __PV_BITS_23_16);
 193#endif
 194        return t;
 195}
 196#else
 197#define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
 198#define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
 199#endif
 200#endif
 201
 202#ifndef PHYS_OFFSET
 203#define PHYS_OFFSET     PLAT_PHYS_OFFSET
 204#endif
 205
 206/*
 207 * The DMA mask corresponding to the maximum bus address allocatable
 208 * using GFP_DMA.  The default here places no restriction on DMA
 209 * allocations.  This must be the smallest DMA mask in the system,
 210 * so a successful GFP_DMA allocation will always satisfy this.
 211 */
 212#ifndef ARM_DMA_ZONE_SIZE
 213#define ISA_DMA_THRESHOLD       (0xffffffffULL)
 214#else
 215#define ISA_DMA_THRESHOLD       (PHYS_OFFSET + ARM_DMA_ZONE_SIZE - 1)
 216#endif
 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 (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 */
 234static inline phys_addr_t virt_to_phys(const volatile void *x)
 235{
 236        return __virt_to_phys((unsigned long)(x));
 237}
 238
 239static 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
 264static inline __deprecated unsigned long virt_to_bus(void *x)
 265{
 266        return __virt_to_bus((unsigned long)x);
 267}
 268
 269static inline __deprecated void *bus_to_virt(unsigned long x)
 270{
 271        return (void *)__bus_to_virt(x);
 272}
 273
 274/*
 275 * Conversion between a struct page and a physical address.
 276 *
 277 * Note: when converting an unknown physical address to a
 278 * struct page, the resulting pointer must be validated
 279 * using VALID_PAGE().  It must return an invalid struct page
 280 * for any physical address not corresponding to a system
 281 * RAM address.
 282 *
 283 *  page_to_pfn(page)   convert a struct page * to a PFN number
 284 *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 285 *
 286 *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 287 *  virt_addr_valid(k)  indicates whether a virtual address is valid
 288 */
 289#define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 290
 291#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 292#define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 293
 294/*
 295 * Optional coherency support.  Currently used only by selected
 296 * Intel XSC3-based systems.
 297 */
 298#ifndef arch_is_coherent
 299#define arch_is_coherent()              0
 300#endif
 301
 302#endif
 303
 304#include <asm-generic/memory_model.h>
 305
 306#endif
 307
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