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_VADDR           (PAGE_OFFSET - 16*1024*1024)
  48 #if TASK_SIZE > MODULES_VADDR
  49 #error Top of user space clashes with start of module space
  50 #endif
  51
  52 /*
  53  * The highmem pkmap virtual space shares the end of the module area.
  54  */
  55 #ifdef CONFIG_HIGHMEM
  56 #define MODULES_END             (PAGE_OFFSET - PMD_SIZE)
  57 #else
  58 #define MODULES_END             (PAGE_OFFSET)
  59 #endif
  60
  61 /*
  62  * The XIP kernel gets mapped at the bottom of the module vm area.
  63  * Since we use sections to map it, this macro replaces the physical address
  64  * with its virtual address while keeping offset from the base section.
  65  */
  66 #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
  67
  68 /*
  69  * Allow 16MB-aligned ioremap pages
  70  */
  71 #define IOREMAP_MAX_ORDER       24
  72
  73 #else /* CONFIG_MMU */
  74
  75 /*
  76  * The limitation of user task size can grow up to the end of free ram region.
  77  * It is difficult to define and perhaps will never meet the original meaning
  78  * of this define that was meant to.
  79  * Fortunately, there is no reference for this in noMMU mode, for now.
  80  */
  81 #ifndef TASK_SIZE
  82 #define TASK_SIZE               (CONFIG_DRAM_SIZE)
  83 #endif
  84
  85 #ifndef TASK_UNMAPPED_BASE
  86 #define TASK_UNMAPPED_BASE      UL(0x00000000)
  87 #endif
  88
  89 #ifndef PHYS_OFFSET
  90 #define PHYS_OFFSET             (CONFIG_DRAM_BASE)
  91 #endif
  92
  93 #ifndef END_MEM
  94 #define END_MEM                 (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
  95 #endif
  96
  97 #ifndef PAGE_OFFSET
  98 #define PAGE_OFFSET             (PHYS_OFFSET)
  99 #endif
 100
 101 /*
 102  * The module can be at any place in ram in nommu mode.
 103  */
 104 #define MODULES_END             (END_MEM)
 105 #define MODULES_VADDR           (PHYS_OFFSET)
 106
 107 #endif /* !CONFIG_MMU */
 108
 109 /*
 110  * Size of DMA-consistent memory region.  Must be multiple of 2M,
 111  * between 2MB and 14MB inclusive.
 112  */
 113 #ifndef CONSISTENT_DMA_SIZE
 114 #define CONSISTENT_DMA_SIZE SZ_2M
 115 #endif
 116
 117 /*
 118  * Physical vs virtual RAM address space conversion.  These are
 119  * private definitions which should NOT be used outside memory.h
 120  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 121  */
 122 #define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
 123 #define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
 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 #elif !defined(CONFIG_ZONE_DMA)
 146 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
 147 #endif
 148
 149 /*
 150  * PFNs are used to describe any physical page; this means
 151  * PFN 0 == physical address 0.
 152  *
 153  * This is the PFN of the first RAM page in the kernel
 154  * direct-mapped view.  We assume this is the first page
 155  * of RAM in the mem_map as well.
 156  */
 157 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 158
 159 /*
 160  * These are *only* valid on the kernel direct mapped RAM memory.
 161  * Note: Drivers should NOT use these.  They are the wrong
 162  * translation for translating DMA addresses.  Use the driver
 163  * DMA support - see dma-mapping.h.
 164  */
 165 static inline unsigned long virt_to_phys(void *x)
 166 {
 167         return __virt_to_phys((unsigned long)(x));
 168 }
 169
 170 static inline void *phys_to_virt(unsigned long x)
 171 {
 172         return (void *)(__phys_to_virt((unsigned long)(x)));
 173 }
 174
 175 /*
 176  * Drivers should NOT use these either.
 177  */
 178 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 179 #define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
 180 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 181
 182 /*
 183  * Virtual <-> DMA view memory address translations
 184  * Again, these are *only* valid on the kernel direct mapped RAM
 185  * memory.  Use of these is *deprecated* (and that doesn't mean
 186  * use the __ prefixed forms instead.)  See dma-mapping.h.
 187  */
 188 #ifndef __virt_to_bus
 189 #define __virt_to_bus   __virt_to_phys
 190 #define __bus_to_virt   __phys_to_virt
 191 #endif
 192
 193 static inline __deprecated unsigned long virt_to_bus(void *x)
 194 {
 195         return __virt_to_bus((unsigned long)x);
 196 }
 197
 198 static inline __deprecated void *bus_to_virt(unsigned long x)
 199 {
 200         return (void *)__bus_to_virt(x);
 201 }
 202
 203 /*
 204  * Conversion between a struct page and a physical address.
 205  *
 206  * Note: when converting an unknown physical address to a
 207  * struct page, the resulting pointer must be validated
 208  * using VALID_PAGE().  It must return an invalid struct page
 209  * for any physical address not corresponding to a system
 210  * RAM address.
 211  *
 212  *  page_to_pfn(page)   convert a struct page * to a PFN number
 213  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 214  *  pfn_valid(pfn)      indicates whether a PFN number is valid
 215  *
 216  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 217  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 218  */
 219 #ifndef CONFIG_DISCONTIGMEM
 220
 221 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 222
 223 #ifndef CONFIG_SPARSEMEM
 224 #define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
 225 #endif
 226
 227 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 228 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 229
 230 #define PHYS_TO_NID(addr)       (0)
 231
 232 #else /* CONFIG_DISCONTIGMEM */
 233
 234 /*
 235  * This is more complex.  We have a set of mem_map arrays spread
 236  * around in memory.
 237  */
 238 #include <linux/numa.h>
 239
 240 #define arch_pfn_to_nid(pfn)    PFN_TO_NID(pfn)
 241 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
 242
 243 #define pfn_valid(pfn)                                          \
 244         ({                                                      \
 245                 unsigned int nid = PFN_TO_NID(pfn);             \
 246                 int valid = nid < MAX_NUMNODES;                 \
 247                 if (valid) {                                    \
 248                         pg_data_t *node = NODE_DATA(nid);       \
 249                         valid = (pfn - node->node_start_pfn) <  \
 250                                 node->node_spanned_pages;       \
 251                 }                                               \
 252                 valid;                                          \
 253         })
 254
 255 #define virt_to_page(kaddr)                                     \
 256         (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
 257
 258 #define virt_addr_valid(kaddr)  (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
 259
 260 /*
 261  * Common discontigmem stuff.
 262  *  PHYS_TO_NID is used by the ARM kernel/setup.c
 263  */
 264 #define PHYS_TO_NID(addr)       PFN_TO_NID((addr) >> PAGE_SHIFT)
 265
 266 /*
 267  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
 268  * and returns the mem_map of that node.
 269  */
 270 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
 271
 272 /*
 273  * Given a page frame number, find the owning node of the memory
 274  * and returns the mem_map of that node.
 275  */
 276 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
 277
 278 #ifdef NODE_MEM_SIZE_BITS
 279 #define NODE_MEM_SIZE_MASK      ((1 << NODE_MEM_SIZE_BITS) - 1)
 280
 281 /*
 282  * Given a kernel address, find the home node of the underlying memory.
 283  */
 284 #define KVADDR_TO_NID(addr) \
 285         (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
 286
 287 /*
 288  * Given a page frame number, convert it to a node id.
 289  */
 290 #define PFN_TO_NID(pfn) \
 291         (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
 292
 293 /*
 294  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
 295  * and returns the index corresponding to the appropriate page in the
 296  * node's mem_map.
 297  */
 298 #define LOCAL_MAP_NR(addr) \
 299         (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
 300
 301 #endif /* NODE_MEM_SIZE_BITS */
 302
 303 #endif /* !CONFIG_DISCONTIGMEM */
 304
 305 /*
 306  * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
 307  */
 308 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 309
 310 /*
 311  * Optional coherency support.  Currently used only by selected
 312  * Intel XSC3-based systems.
 313  */
 314 #ifndef arch_is_coherent
 315 #define arch_is_coherent()              0
 316 #endif
 317
 318 #endif
 319
 320 #include <asm-generic/memory_model.h>
 321
 322 #endif