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  */
  93 static inline unsigned long virt_to_phys(void *x)
  94 {
  95         return __virt_to_phys((unsigned long)(x));
  96 }
  97
  98 static 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  */
 115 static inline __deprecated unsigned long virt_to_bus(void *x)
 116 {
 117         return __virt_to_bus((unsigned long)x);
 118 }
 119
 120 static 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