LXR linux/include/asm-arm/memory.h

   1/*
   2 *  linux/include/asm-arm/memory.h
   3 *
   4 *  Copyright (C) 2000-2002 Russell King
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 *  Note: this file should not be included by non-asm/.h files
  11 */
  12#ifndef __ASM_ARM_MEMORY_H
  13#define __ASM_ARM_MEMORY_H
  14
  15#include <linux/config.h>
  16#include <linux/compiler.h>
  17#include <asm/arch/memory.h>
  18
  19#ifndef TASK_SIZE
  20/*
  21 * TASK_SIZE - the maximum size of a user space task.
  22 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  23 */
  24#define TASK_SIZE               (0xbf000000UL)
  25#define TASK_UNMAPPED_BASE      (0x40000000UL)
  26#endif
  27
  28/*
  29 * The maximum size of a 26-bit user space task.
  30 */
  31#define TASK_SIZE_26            (0x04000000UL)
  32
  33/*
  34 * Page offset: 3GB
  35 */
  36#ifndef PAGE_OFFSET
  37#define PAGE_OFFSET             (0xc0000000UL)
  38#endif
  39
  40/*
  41 * Physical vs virtual RAM address space conversion.  These are
  42 * private definitions which should NOT be used outside memory.h
  43 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  44 */
  45#ifndef __virt_to_phys
  46#define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
  47#define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
  48#endif
  49
  50/*
  51 * The module space lives between the addresses given by TASK_SIZE
  52 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  53 */
  54#define MODULE_END      (PAGE_OFFSET)
  55#define MODULE_START    (MODULE_END - 16*1048576)
  56
  57#if TASK_SIZE > MODULE_START
  58#error Top of user space clashes with start of module space
  59#endif
  60
  61#ifndef __ASSEMBLY__
  62
  63/*
  64 * The DMA mask corresponding to the maximum bus address allocatable
  65 * using GFP_DMA.  The default here places no restriction on DMA
  66 * allocations.  This must be the smallest DMA mask in the system,
  67 * so a successful GFP_DMA allocation will always satisfy this.
  68 */
  69#ifndef ISA_DMA_THRESHOLD
  70#define ISA_DMA_THRESHOLD       (0xffffffffULL)
  71#endif
  72
  73#ifndef arch_adjust_zones
  74#define arch_adjust_zones(node,size,holes) do { } while (0)
  75#endif
  76
  77/*
  78 * PFNs are used to describe any physical page; this means
  79 * PFN 0 == physical address 0.
  80 *
  81 * This is the PFN of the first RAM page in the kernel
  82 * direct-mapped view.  We assume this is the first page
  83 * of RAM in the mem_map as well.
  84 */
  85#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
  86
  87/*
  88 * These are *only* valid on the kernel direct mapped RAM memory.
  89 * Note: Drivers should NOT use these.  They are the wrong
  90 * translation for translating DMA addresses.  Use the driver
  91 * DMA support - see dma-mapping.h.
  92 */
  93static inline unsigned long virt_to_phys(void *x)
  94{
  95        return __virt_to_phys((unsigned long)(x));
  96}
  97
  98static inline void *phys_to_virt(unsigned long x)
  99{
 100        return (void *)(__phys_to_virt((unsigned long)(x)));
 101}
 102
 103/*
 104 * Drivers should NOT use these either.
 105 */
 106#define __pa(x)                 __virt_to_phys((unsigned long)(x))
 107#define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
 108
 109/*
 110 * Virtual <-> DMA view memory address translations
 111 * Again, these are *only* valid on the kernel direct mapped RAM
 112 * memory.  Use of these is *deprecated* (and that doesn't mean
 113 * use the __ prefixed forms instead.)  See dma-mapping.h.
 114 */
 115static inline __deprecated unsigned long virt_to_bus(void *x)
 116{
 117        return __virt_to_bus((unsigned long)x);
 118}
 119
 120static inline __deprecated void *bus_to_virt(unsigned long x)
 121{
 122        return (void *)__bus_to_virt(x);
 123}
 124
 125/*
 126 * Conversion between a struct page and a physical address.
 127 *
 128 * Note: when converting an unknown physical address to a
 129 * struct page, the resulting pointer must be validated
 130 * using VALID_PAGE().  It must return an invalid struct page
 131 * for any physical address not corresponding to a system
 132 * RAM address.
 133 *
 134 *  page_to_pfn(page)   convert a struct page * to a PFN number
 135 *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 136 *  pfn_valid(pfn)      indicates whether a PFN number is valid
 137 *
 138 *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 139 *  virt_addr_valid(k)  indicates whether a virtual address is valid
 140 */
 141#ifndef CONFIG_DISCONTIGMEM
 142
 143#define page_to_pfn(page)       (((page) - mem_map) + PHYS_PFN_OFFSET)
 144#define pfn_to_page(pfn)        ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
 145#define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
 146
 147#define virt_to_page(kaddr)     (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 148#define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 149
 150#define PHYS_TO_NID(addr)       (0)
 151
 152#else /* CONFIG_DISCONTIGMEM */
 153
 154/*
 155 * This is more complex.  We have a set of mem_map arrays spread
 156 * around in memory.
 157 */
 158#include <linux/numa.h>
 159
 160#define page_to_pfn(page)                                       \
 161        (( (page) - page_zone(page)->zone_mem_map)              \
 162          + page_zone(page)->zone_start_pfn)
 163#define pfn_to_page(pfn)                                        \
 164        (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
 165#define pfn_valid(pfn)          (PFN_TO_NID(pfn) < MAX_NUMNODES)
 166
 167#define virt_to_page(kaddr)                                     \
 168        (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
 169#define virt_addr_valid(kaddr)  (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
 170
 171/*
 172 * Common discontigmem stuff.
 173 *  PHYS_TO_NID is used by the ARM kernel/setup.c
 174 */
 175#define PHYS_TO_NID(addr)       PFN_TO_NID((addr) >> PAGE_SHIFT)
 176
 177#endif /* !CONFIG_DISCONTIGMEM */
 178
 179/*
 180 * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
 181 */
 182#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 183
 184/*
 185 * Optional device DMA address remapping. Do _not_ use directly!
 186 * We should really eliminate virt_to_bus() here - it's deprecated.
 187 */
 188#ifndef __arch_page_to_dma
 189#define page_to_dma(dev, page)          ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
 190#define dma_to_virt(dev, addr)          ((void *)__bus_to_virt(addr))
 191#define virt_to_dma(dev, addr)          ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
 192#else
 193#define page_to_dma(dev, page)          (__arch_page_to_dma(dev, page))
 194#define dma_to_virt(dev, addr)          (__arch_dma_to_virt(dev, addr))
 195#define virt_to_dma(dev, addr)          (__arch_virt_to_dma(dev, addr))
 196#endif
 197
 198#endif
 199
 200#endif
 201