arch/arm/include/asm/memory.h

   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 <mach/memory.h>
  19 #include <asm/sizes.h>
  20
  21 /*
  22  * Allow for constants defined here to be used from assembly code
  23  * by prepending the UL suffix only with actual C code compilation.
  24  */
  25 #define UL(x) _AC(x, UL)
  26
  27 #ifdef CONFIG_MMU
  28
  29 /*
  30  * PAGE_OFFSET - the virtual address of the start of the kernel image
  31  * TASK_SIZE - the maximum size of a user space task.
  32  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  33  */
  34 #define PAGE_OFFSET             UL(CONFIG_PAGE_OFFSET)
  35 #define TASK_SIZE               (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
  36 #define TASK_UNMAPPED_BASE      (UL(CONFIG_PAGE_OFFSET) / 3)
  37
  38 /*
  39  * The maximum size of a 26-bit user space task.
  40  */
  41 #define TASK_SIZE_26            UL(0x04000000)
  42
  43 /*
  44  * The module space lives between the addresses given by TASK_SIZE
  45  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  46  */
  47 #define MODULES_END             (PAGE_OFFSET)
  48 #define MODULES_VADDR           (MODULES_END - 16*1048576)
  49
  50 #if TASK_SIZE > MODULES_VADDR
  51 #error Top of user space clashes with start of module space
  52 #endif
  53
  54 /*
  55  * The XIP kernel gets mapped at the bottom of the module vm area.
  56  * Since we use sections to map it, this macro replaces the physical address
  57  * with its virtual address while keeping offset from the base section.
  58  */
  59 #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
  60
  61 /*
  62  * Allow 16MB-aligned ioremap pages
  63  */
  64 #define IOREMAP_MAX_ORDER       24
  65
  66 #else /* CONFIG_MMU */
  67
  68 /*
  69  * The limitation of user task size can grow up to the end of free ram region.
  70  * It is difficult to define and perhaps will never meet the original meaning
  71  * of this define that was meant to.
  72  * Fortunately, there is no reference for this in noMMU mode, for now.
  73  */
  74 #ifndef TASK_SIZE
  75 #define TASK_SIZE               (CONFIG_DRAM_SIZE)
  76 #endif
  77
  78 #ifndef TASK_UNMAPPED_BASE
  79 #define TASK_UNMAPPED_BASE      UL(0x00000000)
  80 #endif
  81
  82 #ifndef PHYS_OFFSET
  83 #define PHYS_OFFSET             (CONFIG_DRAM_BASE)
  84 #endif
  85
  86 #ifndef END_MEM
  87 #define END_MEM                 (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
  88 #endif
  89
  90 #ifndef PAGE_OFFSET
  91 #define PAGE_OFFSET             (PHYS_OFFSET)
  92 #endif
  93
  94 /*
  95  * The module can be at any place in ram in nommu mode.
  96  */
  97 #define MODULES_END             (END_MEM)
  98 #define MODULES_VADDR           (PHYS_OFFSET)
  99
 100 #endif /* !CONFIG_MMU */
 101
 102 /*
 103  * Size of DMA-consistent memory region.  Must be multiple of 2M,
 104  * between 2MB and 14MB inclusive.
 105  */
 106 #ifndef CONSISTENT_DMA_SIZE
 107 #define CONSISTENT_DMA_SIZE SZ_2M
 108 #endif
 109
 110 /*
 111  * Physical vs virtual RAM address space conversion.  These are
 112  * private definitions which should NOT be used outside memory.h
 113  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 114  */
 115 #ifndef __virt_to_phys
 116 #define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
 117 #define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
 118 #endif
 119
 120 /*
 121  * Convert a physical address to a Page Frame Number and back
 122  */
 123 #define __phys_to_pfn(paddr)    ((paddr) >> PAGE_SHIFT)
 124 #define __pfn_to_phys(pfn)      ((pfn) << PAGE_SHIFT)
 125
 126 #ifndef __ASSEMBLY__
 127
 128 /*
 129  * The DMA mask corresponding to the maximum bus address allocatable
 130  * using GFP_DMA.  The default here places no restriction on DMA
 131  * allocations.  This must be the smallest DMA mask in the system,
 132  * so a successful GFP_DMA allocation will always satisfy this.
 133  */
 134 #ifndef ISA_DMA_THRESHOLD
 135 #define ISA_DMA_THRESHOLD       (0xffffffffULL)
 136 #endif
 137
 138 #ifndef arch_adjust_zones
 139 #define arch_adjust_zones(node,size,holes) do { } while (0)
 140 #elif !defined(CONFIG_ZONE_DMA)
 141 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
 142 #endif
 143
 144 /*
 145  * PFNs are used to describe any physical page; this means
 146  * PFN 0 == physical address 0.
 147  *
 148  * This is the PFN of the first RAM page in the kernel
 149  * direct-mapped view.  We assume this is the first page
 150  * of RAM in the mem_map as well.
 151  */
 152 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 153
 154 /*
 155  * These are *only* valid on the kernel direct mapped RAM memory.
 156  * Note: Drivers should NOT use these.  They are the wrong
 157  * translation for translating DMA addresses.  Use the driver
 158  * DMA support - see dma-mapping.h.
 159  */
 160 static inline unsigned long virt_to_phys(void *x)
 161 {
 162         return __virt_to_phys((unsigned long)(x));
 163 }
 164
 165 static inline void *phys_to_virt(unsigned long x)
 166 {
 167         return (void *)(__phys_to_virt((unsigned long)(x)));
 168 }
 169
 170 /*
 171  * Drivers should NOT use these either.
 172  */
 173 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 174 #define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
 175 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 176
 177 /*
 178  * Virtual <-> DMA view memory address translations
 179  * Again, these are *only* valid on the kernel direct mapped RAM
 180  * memory.  Use of these is *deprecated* (and that doesn't mean
 181  * use the __ prefixed forms instead.)  See dma-mapping.h.
 182  */
 183 static inline __deprecated unsigned long virt_to_bus(void *x)
 184 {
 185         return __virt_to_bus((unsigned long)x);
 186 }
 187
 188 static inline __deprecated void *bus_to_virt(unsigned long x)
 189 {
 190         return (void *)__bus_to_virt(x);
 191 }
 192
 193 /*
 194  * Conversion between a struct page and a physical address.
 195  *
 196  * Note: when converting an unknown physical address to a
 197  * struct page, the resulting pointer must be validated
 198  * using VALID_PAGE().  It must return an invalid struct page
 199  * for any physical address not corresponding to a system
 200  * RAM address.
 201  *
 202  *  page_to_pfn(page)   convert a struct page * to a PFN number
 203  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 204  *  pfn_valid(pfn)      indicates whether a PFN number is valid
 205  *
 206  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 207  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 208  */
 209 #ifndef CONFIG_DISCONTIGMEM
 210
 211 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 212
 213 #ifndef CONFIG_SPARSEMEM
 214 #define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
 215 #endif
 216
 217 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 218 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 219
 220 #define PHYS_TO_NID(addr)       (0)
 221
 222 #else /* CONFIG_DISCONTIGMEM */
 223
 224 /*
 225  * This is more complex.  We have a set of mem_map arrays spread
 226  * around in memory.
 227  */
 228 #include <linux/numa.h>
 229
 230 #define arch_pfn_to_nid(pfn)    PFN_TO_NID(pfn)
 231 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
 232
 233 #define pfn_valid(pfn)                                          \
 234         ({                                                      \
 235                 unsigned int nid = PFN_TO_NID(pfn);             \
 236                 int valid = nid < MAX_NUMNODES;                 \
 237                 if (valid) {                                    \
 238                         pg_data_t *node = NODE_DATA(nid);       \
 239                         valid = (pfn - node->node_start_pfn) <  \
 240                                 node->node_spanned_pages;       \
 241                 }                                               \
 242                 valid;                                          \
 243         })
 244
 245 #define virt_to_page(kaddr)                                     \
 246         (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
 247
 248 #define virt_addr_valid(kaddr)  (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
 249
 250 /*
 251  * Common discontigmem stuff.
 252  *  PHYS_TO_NID is used by the ARM kernel/setup.c
 253  */
 254 #define PHYS_TO_NID(addr)       PFN_TO_NID((addr) >> PAGE_SHIFT)
 255
 256 /*
 257  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
 258  * and returns the mem_map of that node.
 259  */
 260 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
 261
 262 /*
 263  * Given a page frame number, find the owning node of the memory
 264  * and returns the mem_map of that node.
 265  */
 266 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
 267
 268 #ifdef NODE_MEM_SIZE_BITS
 269 #define NODE_MEM_SIZE_MASK      ((1 << NODE_MEM_SIZE_BITS) - 1)
 270
 271 /*
 272  * Given a kernel address, find the home node of the underlying memory.
 273  */
 274 #define KVADDR_TO_NID(addr) \
 275         (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
 276
 277 /*
 278  * Given a page frame number, convert it to a node id.
 279  */
 280 #define PFN_TO_NID(pfn) \
 281         (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
 282
 283 /*
 284  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
 285  * and returns the index corresponding to the appropriate page in the
 286  * node's mem_map.
 287  */
 288 #define LOCAL_MAP_NR(addr) \
 289         (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
 290
 291 #endif /* NODE_MEM_SIZE_BITS */
 292
 293 #endif /* !CONFIG_DISCONTIGMEM */
 294
 295 /*
 296  * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
 297  */
 298 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 299
 300 /*
 301  * Optional coherency support.  Currently used only by selected
 302  * Intel XSC3-based systems.
 303  */
 304 #ifndef arch_is_coherent
 305 #define arch_is_coherent()              0
 306 #endif
 307
 308 #endif
 309
 310 #include <asm-generic/memory_model.h>
 311
 312 #endif