include/asm-arm/memory.h

   1 /*
   2  *  linux/include/asm-arm/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 /*
  17  * Allow for constants defined here to be used from assembly code
  18  * by prepending the UL suffix only with actual C code compilation.
  19  */
  20 #ifndef __ASSEMBLY__
  21 #define UL(x) (x##UL)
  22 #else
  23 #define UL(x) (x)
  24 #endif
  25
  26 #include <linux/compiler.h>
  27 #include <asm/arch/memory.h>
  28 #include <asm/sizes.h>
  29
  30 #ifdef CONFIG_MMU
  31
  32 #ifndef TASK_SIZE
  33 /*
  34  * TASK_SIZE - the maximum size of a user space task.
  35  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  36  */
  37 #define TASK_SIZE               UL(0xbf000000)
  38 #define TASK_UNMAPPED_BASE      UL(0x40000000)
  39 #endif
  40
  41 /*
  42  * The maximum size of a 26-bit user space task.
  43  */
  44 #define TASK_SIZE_26            UL(0x04000000)
  45
  46 /*
  47  * Page offset: 3GB
  48  */
  49 #ifndef PAGE_OFFSET
  50 #define PAGE_OFFSET             UL(0xc0000000)
  51 #endif
  52
  53 /*
  54  * The module space lives between the addresses given by TASK_SIZE
  55  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  56  */
  57 #define MODULE_END              (PAGE_OFFSET)
  58 #define MODULE_START            (MODULE_END - 16*1048576)
  59
  60 #if TASK_SIZE > MODULE_START
  61 #error Top of user space clashes with start of module space
  62 #endif
  63
  64 /*
  65  * The XIP kernel gets mapped at the bottom of the module vm area.
  66  * Since we use sections to map it, this macro replaces the physical address
  67  * with its virtual address while keeping offset from the base section.
  68  */
  69 #define XIP_VIRT_ADDR(physaddr)  (MODULE_START + ((physaddr) & 0x000fffff))
  70
  71 #else /* CONFIG_MMU */
  72
  73 /*
  74  * The limitation of user task size can grow up to the end of free ram region.
  75  * It is difficult to define and perhaps will never meet the original meaning
  76  * of this define that was meant to.
  77  * Fortunately, there is no reference for this in noMMU mode, for now.
  78  */
  79 #ifndef TASK_SIZE
  80 #define TASK_SIZE               (CONFIG_DRAM_SIZE)
  81 #endif
  82
  83 #ifndef TASK_UNMAPPED_BASE
  84 #define TASK_UNMAPPED_BASE      UL(0x00000000)
  85 #endif
  86
  87 #ifndef PHYS_OFFSET
  88 #define PHYS_OFFSET             (CONFIG_DRAM_BASE)
  89 #endif
  90
  91 #ifndef END_MEM
  92 #define END_MEM                 (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
  93 #endif
  94
  95 #ifndef PAGE_OFFSET
  96 #define PAGE_OFFSET             (PHYS_OFFSET)
  97 #endif
  98
  99 /*
 100  * The module can be at any place in ram in nommu mode.
 101  */
 102 #define MODULE_END              (END_MEM)
 103 #define MODULE_START            (PHYS_OFFSET)
 104
 105 #endif /* !CONFIG_MMU */
 106
 107 /*
 108  * Size of DMA-consistent memory region.  Must be multiple of 2M,
 109  * between 2MB and 14MB inclusive.
 110  */
 111 #ifndef CONSISTENT_DMA_SIZE
 112 #define CONSISTENT_DMA_SIZE SZ_2M
 113 #endif
 114
 115 /*
 116  * Physical vs virtual RAM address space conversion.  These are
 117  * private definitions which should NOT be used outside memory.h
 118  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 119  */
 120 #ifndef __virt_to_phys
 121 #define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
 122 #define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
 123 #endif
 124
 125 /*
 126  * Convert a physical address to a Page Frame Number and back
 127  */
 128 #define __phys_to_pfn(paddr)    ((paddr) >> PAGE_SHIFT)
 129 #define __pfn_to_phys(pfn)      ((pfn) << PAGE_SHIFT)
 130
 131 #ifndef __ASSEMBLY__
 132
 133 /*
 134  * The DMA mask corresponding to the maximum bus address allocatable
 135  * using GFP_DMA.  The default here places no restriction on DMA
 136  * allocations.  This must be the smallest DMA mask in the system,
 137  * so a successful GFP_DMA allocation will always satisfy this.
 138  */
 139 #ifndef ISA_DMA_THRESHOLD
 140 #define ISA_DMA_THRESHOLD       (0xffffffffULL)
 141 #endif
 142
 143 #ifndef arch_adjust_zones
 144 #define arch_adjust_zones(node,size,holes) do { } while (0)
 145 #endif
 146
 147 /*
 148  * PFNs are used to describe any physical page; this means
 149  * PFN 0 == physical address 0.
 150  *
 151  * This is the PFN of the first RAM page in the kernel
 152  * direct-mapped view.  We assume this is the first page
 153  * of RAM in the mem_map as well.
 154  */
 155 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 156
 157 /*
 158  * These are *only* valid on the kernel direct mapped RAM memory.
 159  * Note: Drivers should NOT use these.  They are the wrong
 160  * translation for translating DMA addresses.  Use the driver
 161  * DMA support - see dma-mapping.h.
 162  */
 163 static inline unsigned long virt_to_phys(void *x)
 164 {
 165         return __virt_to_phys((unsigned long)(x));
 166 }
 167
 168 static inline void *phys_to_virt(unsigned long x)
 169 {
 170         return (void *)(__phys_to_virt((unsigned long)(x)));
 171 }
 172
 173 /*
 174  * Drivers should NOT use these either.
 175  */
 176 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 177 #define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
 178 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 179
 180 /*
 181  * Virtual <-> DMA view memory address translations
 182  * Again, these are *only* valid on the kernel direct mapped RAM
 183  * memory.  Use of these is *deprecated* (and that doesn't mean
 184  * use the __ prefixed forms instead.)  See dma-mapping.h.
 185  */
 186 static inline __deprecated unsigned long virt_to_bus(void *x)
 187 {
 188         return __virt_to_bus((unsigned long)x);
 189 }
 190
 191 static inline __deprecated void *bus_to_virt(unsigned long x)
 192 {
 193         return (void *)__bus_to_virt(x);
 194 }
 195
 196 /*
 197  * Conversion between a struct page and a physical address.
 198  *
 199  * Note: when converting an unknown physical address to a
 200  * struct page, the resulting pointer must be validated
 201  * using VALID_PAGE().  It must return an invalid struct page
 202  * for any physical address not corresponding to a system
 203  * RAM address.
 204  *
 205  *  page_to_pfn(page)   convert a struct page * to a PFN number
 206  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 207  *  pfn_valid(pfn)      indicates whether a PFN number is valid
 208  *
 209  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 210  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 211  */
 212 #ifndef CONFIG_DISCONTIGMEM
 213 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 214 #define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
 215
 216 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 217 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 218
 219 #define PHYS_TO_NID(addr)       (0)
 220
 221 #else /* CONFIG_DISCONTIGMEM */
 222
 223 /*
 224  * This is more complex.  We have a set of mem_map arrays spread
 225  * around in memory.
 226  */
 227 #include <linux/numa.h>
 228 #define arch_pfn_to_nid(pfn)    PFN_TO_NID(pfn)
 229 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
 230
 231 #define pfn_valid(pfn)                                          \
 232         ({                                                      \
 233                 unsigned int nid = PFN_TO_NID(pfn);             \
 234                 int valid = nid < MAX_NUMNODES;                 \
 235                 if (valid) {                                    \
 236                         pg_data_t *node = NODE_DATA(nid);       \
 237                         valid = (pfn - node->node_start_pfn) <  \
 238                                 node->node_spanned_pages;       \
 239                 }                                               \
 240                 valid;                                          \
 241         })
 242
 243 #define virt_to_page(kaddr)                                     \
 244         (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
 245
 246 #define virt_addr_valid(kaddr)  (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
 247
 248 /*
 249  * Common discontigmem stuff.
 250  *  PHYS_TO_NID is used by the ARM kernel/setup.c
 251  */
 252 #define PHYS_TO_NID(addr)       PFN_TO_NID((addr) >> PAGE_SHIFT)
 253
 254 #endif /* !CONFIG_DISCONTIGMEM */
 255
 256 /*
 257  * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
 258  */
 259 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 260
 261 /*
 262  * Optional device DMA address remapping. Do _not_ use directly!
 263  * We should really eliminate virt_to_bus() here - it's deprecated.
 264  */
 265 #ifndef __arch_page_to_dma
 266 #define page_to_dma(dev, page)          ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
 267 #define dma_to_virt(dev, addr)          ((void *)__bus_to_virt(addr))
 268 #define virt_to_dma(dev, addr)          ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
 269 #else
 270 #define page_to_dma(dev, page)          (__arch_page_to_dma(dev, page))
 271 #define dma_to_virt(dev, addr)          (__arch_dma_to_virt(dev, addr))
 272 #define virt_to_dma(dev, addr)          (__arch_virt_to_dma(dev, addr))
 273 #endif
 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