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 /*
  72  * Allow 16MB-aligned ioremap pages
  73  */
  74 #define IOREMAP_MAX_ORDER       24
  75
  76 #else /* CONFIG_MMU */
  77
  78 /*
  79  * The limitation of user task size can grow up to the end of free ram region.
  80  * It is difficult to define and perhaps will never meet the original meaning
  81  * of this define that was meant to.
  82  * Fortunately, there is no reference for this in noMMU mode, for now.
  83  */
  84 #ifndef TASK_SIZE
  85 #define TASK_SIZE               (CONFIG_DRAM_SIZE)
  86 #endif
  87
  88 #ifndef TASK_UNMAPPED_BASE
  89 #define TASK_UNMAPPED_BASE      UL(0x00000000)
  90 #endif
  91
  92 #ifndef PHYS_OFFSET
  93 #define PHYS_OFFSET             (CONFIG_DRAM_BASE)
  94 #endif
  95
  96 #ifndef END_MEM
  97 #define END_MEM                 (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
  98 #endif
  99
 100 #ifndef PAGE_OFFSET
 101 #define PAGE_OFFSET             (PHYS_OFFSET)
 102 #endif
 103
 104 /*
 105  * The module can be at any place in ram in nommu mode.
 106  */
 107 #define MODULE_END              (END_MEM)
 108 #define MODULE_START            (PHYS_OFFSET)
 109
 110 #endif /* !CONFIG_MMU */
 111
 112 /*
 113  * Size of DMA-consistent memory region.  Must be multiple of 2M,
 114  * between 2MB and 14MB inclusive.
 115  */
 116 #ifndef CONSISTENT_DMA_SIZE
 117 #define CONSISTENT_DMA_SIZE SZ_2M
 118 #endif
 119
 120 /*
 121  * Physical vs virtual RAM address space conversion.  These are
 122  * private definitions which should NOT be used outside memory.h
 123  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 124  */
 125 #ifndef __virt_to_phys
 126 #define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
 127 #define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
 128 #endif
 129
 130 /*
 131  * Convert a physical address to a Page Frame Number and back
 132  */
 133 #define __phys_to_pfn(paddr)    ((paddr) >> PAGE_SHIFT)
 134 #define __pfn_to_phys(pfn)      ((pfn) << PAGE_SHIFT)
 135
 136 #ifndef __ASSEMBLY__
 137
 138 /*
 139  * The DMA mask corresponding to the maximum bus address allocatable
 140  * using GFP_DMA.  The default here places no restriction on DMA
 141  * allocations.  This must be the smallest DMA mask in the system,
 142  * so a successful GFP_DMA allocation will always satisfy this.
 143  */
 144 #ifndef ISA_DMA_THRESHOLD
 145 #define ISA_DMA_THRESHOLD       (0xffffffffULL)
 146 #endif
 147
 148 #ifndef arch_adjust_zones
 149 #define arch_adjust_zones(node,size,holes) do { } while (0)
 150 #endif
 151
 152 /*
 153  * PFNs are used to describe any physical page; this means
 154  * PFN 0 == physical address 0.
 155  *
 156  * This is the PFN of the first RAM page in the kernel
 157  * direct-mapped view.  We assume this is the first page
 158  * of RAM in the mem_map as well.
 159  */
 160 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 161
 162 /*
 163  * These are *only* valid on the kernel direct mapped RAM memory.
 164  * Note: Drivers should NOT use these.  They are the wrong
 165  * translation for translating DMA addresses.  Use the driver
 166  * DMA support - see dma-mapping.h.
 167  */
 168 static inline unsigned long virt_to_phys(void *x)
 169 {
 170         return __virt_to_phys((unsigned long)(x));
 171 }
 172
 173 static inline void *phys_to_virt(unsigned long x)
 174 {
 175         return (void *)(__phys_to_virt((unsigned long)(x)));
 176 }
 177
 178 /*
 179  * Drivers should NOT use these either.
 180  */
 181 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 182 #define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
 183 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 184
 185 /*
 186  * Virtual <-> DMA view memory address translations
 187  * Again, these are *only* valid on the kernel direct mapped RAM
 188  * memory.  Use of these is *deprecated* (and that doesn't mean
 189  * use the __ prefixed forms instead.)  See dma-mapping.h.
 190  */
 191 static inline __deprecated unsigned long virt_to_bus(void *x)
 192 {
 193         return __virt_to_bus((unsigned long)x);
 194 }
 195
 196 static inline __deprecated void *bus_to_virt(unsigned long x)
 197 {
 198         return (void *)__bus_to_virt(x);
 199 }
 200
 201 /*
 202  * Conversion between a struct page and a physical address.
 203  *
 204  * Note: when converting an unknown physical address to a
 205  * struct page, the resulting pointer must be validated
 206  * using VALID_PAGE().  It must return an invalid struct page
 207  * for any physical address not corresponding to a system
 208  * RAM address.
 209  *
 210  *  page_to_pfn(page)   convert a struct page * to a PFN number
 211  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 212  *  pfn_valid(pfn)      indicates whether a PFN number is valid
 213  *
 214  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 215  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 216  */
 217 #ifndef CONFIG_DISCONTIGMEM
 218
 219 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 220
 221 #ifndef CONFIG_SPARSEMEM
 222 #define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
 223 #endif
 224
 225 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 226 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 227
 228 #define PHYS_TO_NID(addr)       (0)
 229
 230 #else /* CONFIG_DISCONTIGMEM */
 231
 232 /*
 233  * This is more complex.  We have a set of mem_map arrays spread
 234  * around in memory.
 235  */
 236 #include <linux/numa.h>
 237
 238 #define arch_pfn_to_nid(pfn)    PFN_TO_NID(pfn)
 239 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
 240
 241 #define pfn_valid(pfn)                                          \
 242         ({                                                      \
 243                 unsigned int nid = PFN_TO_NID(pfn);             \
 244                 int valid = nid < MAX_NUMNODES;                 \
 245                 if (valid) {                                    \
 246                         pg_data_t *node = NODE_DATA(nid);       \
 247                         valid = (pfn - node->node_start_pfn) <  \
 248                                 node->node_spanned_pages;       \
 249                 }                                               \
 250                 valid;                                          \
 251         })
 252
 253 #define virt_to_page(kaddr)                                     \
 254         (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
 255
 256 #define virt_addr_valid(kaddr)  (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
 257
 258 /*
 259  * Common discontigmem stuff.
 260  *  PHYS_TO_NID is used by the ARM kernel/setup.c
 261  */
 262 #define PHYS_TO_NID(addr)       PFN_TO_NID((addr) >> PAGE_SHIFT)
 263
 264 /*
 265  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
 266  * and returns the mem_map of that node.
 267  */
 268 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
 269
 270 /*
 271  * Given a page frame number, find the owning node of the memory
 272  * and returns the mem_map of that node.
 273  */
 274 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
 275
 276 #ifdef NODE_MEM_SIZE_BITS
 277 #define NODE_MEM_SIZE_MASK      ((1 << NODE_MEM_SIZE_BITS) - 1)
 278
 279 /*
 280  * Given a kernel address, find the home node of the underlying memory.
 281  */
 282 #define KVADDR_TO_NID(addr) \
 283         (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
 284
 285 /*
 286  * Given a page frame number, convert it to a node id.
 287  */
 288 #define PFN_TO_NID(pfn) \
 289         (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
 290
 291 /*
 292  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
 293  * and returns the index corresponding to the appropriate page in the
 294  * node's mem_map.
 295  */
 296 #define LOCAL_MAP_NR(addr) \
 297         (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
 298
 299 #endif /* NODE_MEM_SIZE_BITS */
 300
 301 #endif /* !CONFIG_DISCONTIGMEM */
 302
 303 /*
 304  * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
 305  */
 306 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 307
 308 /*
 309  * Optional device DMA address remapping. Do _not_ use directly!
 310  * We should really eliminate virt_to_bus() here - it's deprecated.
 311  */
 312 #ifndef __arch_page_to_dma
 313 #define page_to_dma(dev, page)          ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
 314 #define dma_to_virt(dev, addr)          ((void *)__bus_to_virt(addr))
 315 #define virt_to_dma(dev, addr)          ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
 316 #else
 317 #define page_to_dma(dev, page)          (__arch_page_to_dma(dev, page))
 318 #define dma_to_virt(dev, addr)          (__arch_dma_to_virt(dev, addr))
 319 #define virt_to_dma(dev, addr)          (__arch_virt_to_dma(dev, addr))
 320 #endif
 321
 322 /*
 323  * Optional coherency support.  Currently used only by selected
 324  * Intel XSC3-based systems.
 325  */
 326 #ifndef arch_is_coherent
 327 #define arch_is_coherent()              0
 328 #endif
 329
 330 #endif
 331
 332 #include <asm-generic/memory_model.h>
 333
 334 #endif