memory.h 9.0 KB

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  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. * Allow for constants defined here to be used from assembly code
  17. * by prepending the UL suffix only with actual C code compilation.
  18. */
  19. #ifndef __ASSEMBLY__
  20. #define UL(x) (x##UL)
  21. #else
  22. #define UL(x) (x)
  23. #endif
  24. #include <linux/compiler.h>
  25. #include <asm/arch/memory.h>
  26. #include <asm/sizes.h>
  27. #ifdef CONFIG_MMU
  28. #ifndef TASK_SIZE
  29. /*
  30. * TASK_SIZE - the maximum size of a user space task.
  31. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  32. */
  33. #define TASK_SIZE UL(0xbf000000)
  34. #define TASK_UNMAPPED_BASE UL(0x40000000)
  35. #endif
  36. /*
  37. * The maximum size of a 26-bit user space task.
  38. */
  39. #define TASK_SIZE_26 UL(0x04000000)
  40. /*
  41. * Page offset: 3GB
  42. */
  43. #ifndef PAGE_OFFSET
  44. #define PAGE_OFFSET UL(0xc0000000)
  45. #endif
  46. /*
  47. * The module space lives between the addresses given by TASK_SIZE
  48. * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  49. */
  50. #define MODULE_END (PAGE_OFFSET)
  51. #define MODULE_START (MODULE_END - 16*1048576)
  52. #if TASK_SIZE > MODULE_START
  53. #error Top of user space clashes with start of module space
  54. #endif
  55. /*
  56. * The XIP kernel gets mapped at the bottom of the module vm area.
  57. * Since we use sections to map it, this macro replaces the physical address
  58. * with its virtual address while keeping offset from the base section.
  59. */
  60. #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff))
  61. /*
  62. * Allow 16MB-aligned ioremap pages
  63. */
  64. #define IOREMAP_MAX_ORDER 24
  65. #else /* CONFIG_MMU */
  66. /*
  67. * The limitation of user task size can grow up to the end of free ram region.
  68. * It is difficult to define and perhaps will never meet the original meaning
  69. * of this define that was meant to.
  70. * Fortunately, there is no reference for this in noMMU mode, for now.
  71. */
  72. #ifndef TASK_SIZE
  73. #define TASK_SIZE (CONFIG_DRAM_SIZE)
  74. #endif
  75. #ifndef TASK_UNMAPPED_BASE
  76. #define TASK_UNMAPPED_BASE UL(0x00000000)
  77. #endif
  78. #ifndef PHYS_OFFSET
  79. #define PHYS_OFFSET (CONFIG_DRAM_BASE)
  80. #endif
  81. #ifndef END_MEM
  82. #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
  83. #endif
  84. #ifndef PAGE_OFFSET
  85. #define PAGE_OFFSET (PHYS_OFFSET)
  86. #endif
  87. /*
  88. * The module can be at any place in ram in nommu mode.
  89. */
  90. #define MODULE_END (END_MEM)
  91. #define MODULE_START (PHYS_OFFSET)
  92. #endif /* !CONFIG_MMU */
  93. /*
  94. * Size of DMA-consistent memory region. Must be multiple of 2M,
  95. * between 2MB and 14MB inclusive.
  96. */
  97. #ifndef CONSISTENT_DMA_SIZE
  98. #define CONSISTENT_DMA_SIZE SZ_8M
  99. #endif
  100. /*
  101. * Physical vs virtual RAM address space conversion. These are
  102. * private definitions which should NOT be used outside memory.h
  103. * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
  104. */
  105. #ifndef __virt_to_phys
  106. #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
  107. #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
  108. #endif
  109. /*
  110. * Convert a physical address to a Page Frame Number and back
  111. */
  112. #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
  113. #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
  114. #ifndef __ASSEMBLY__
  115. /*
  116. * The DMA mask corresponding to the maximum bus address allocatable
  117. * using GFP_DMA. The default here places no restriction on DMA
  118. * allocations. This must be the smallest DMA mask in the system,
  119. * so a successful GFP_DMA allocation will always satisfy this.
  120. */
  121. #ifndef ISA_DMA_THRESHOLD
  122. #define ISA_DMA_THRESHOLD (0xffffffffULL)
  123. #endif
  124. #ifndef arch_adjust_zones
  125. #define arch_adjust_zones(node,size,holes) do { } while (0)
  126. #endif
  127. /*
  128. * PFNs are used to describe any physical page; this means
  129. * PFN 0 == physical address 0.
  130. *
  131. * This is the PFN of the first RAM page in the kernel
  132. * direct-mapped view. We assume this is the first page
  133. * of RAM in the mem_map as well.
  134. */
  135. #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
  136. /*
  137. * These are *only* valid on the kernel direct mapped RAM memory.
  138. * Note: Drivers should NOT use these. They are the wrong
  139. * translation for translating DMA addresses. Use the driver
  140. * DMA support - see dma-mapping.h.
  141. */
  142. static inline unsigned long virt_to_phys(void *x)
  143. {
  144. return __virt_to_phys((unsigned long)(x));
  145. }
  146. static inline void *phys_to_virt(unsigned long x)
  147. {
  148. return (void *)(__phys_to_virt((unsigned long)(x)));
  149. }
  150. /*
  151. * Drivers should NOT use these either.
  152. */
  153. #define __pa(x) __virt_to_phys((unsigned long)(x))
  154. #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
  155. #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
  156. /*
  157. * Virtual <-> DMA view memory address translations
  158. * Again, these are *only* valid on the kernel direct mapped RAM
  159. * memory. Use of these is *deprecated* (and that doesn't mean
  160. * use the __ prefixed forms instead.) See dma-mapping.h.
  161. */
  162. static inline __deprecated unsigned long virt_to_bus(void *x)
  163. {
  164. return __virt_to_bus((unsigned long)x);
  165. }
  166. static inline __deprecated void *bus_to_virt(unsigned long x)
  167. {
  168. return (void *)__bus_to_virt(x);
  169. }
  170. /*
  171. * Conversion between a struct page and a physical address.
  172. *
  173. * Note: when converting an unknown physical address to a
  174. * struct page, the resulting pointer must be validated
  175. * using VALID_PAGE(). It must return an invalid struct page
  176. * for any physical address not corresponding to a system
  177. * RAM address.
  178. *
  179. * page_to_pfn(page) convert a struct page * to a PFN number
  180. * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
  181. * pfn_valid(pfn) indicates whether a PFN number is valid
  182. *
  183. * virt_to_page(k) convert a _valid_ virtual address to struct page *
  184. * virt_addr_valid(k) indicates whether a virtual address is valid
  185. */
  186. #ifndef CONFIG_DISCONTIGMEM
  187. #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
  188. #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
  189. #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  190. #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
  191. #define PHYS_TO_NID(addr) (0)
  192. #else /* CONFIG_DISCONTIGMEM */
  193. /*
  194. * This is more complex. We have a set of mem_map arrays spread
  195. * around in memory.
  196. */
  197. #include <linux/numa.h>
  198. #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
  199. #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
  200. #define pfn_valid(pfn) \
  201. ({ \
  202. unsigned int nid = PFN_TO_NID(pfn); \
  203. int valid = nid < MAX_NUMNODES; \
  204. if (valid) { \
  205. pg_data_t *node = NODE_DATA(nid); \
  206. valid = (pfn - node->node_start_pfn) < \
  207. node->node_spanned_pages; \
  208. } \
  209. valid; \
  210. })
  211. #define virt_to_page(kaddr) \
  212. (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
  213. #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
  214. /*
  215. * Common discontigmem stuff.
  216. * PHYS_TO_NID is used by the ARM kernel/setup.c
  217. */
  218. #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
  219. /*
  220. * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  221. * and returns the mem_map of that node.
  222. */
  223. #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  224. /*
  225. * Given a page frame number, find the owning node of the memory
  226. * and returns the mem_map of that node.
  227. */
  228. #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
  229. #ifdef NODE_MEM_SIZE_BITS
  230. #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
  231. /*
  232. * Given a kernel address, find the home node of the underlying memory.
  233. */
  234. #define KVADDR_TO_NID(addr) \
  235. (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
  236. /*
  237. * Given a page frame number, convert it to a node id.
  238. */
  239. #define PFN_TO_NID(pfn) \
  240. (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
  241. /*
  242. * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  243. * and returns the index corresponding to the appropriate page in the
  244. * node's mem_map.
  245. */
  246. #define LOCAL_MAP_NR(addr) \
  247. (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
  248. #endif /* NODE_MEM_SIZE_BITS */
  249. #endif /* !CONFIG_DISCONTIGMEM */
  250. /*
  251. * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
  252. */
  253. #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
  254. /*
  255. * Optional device DMA address remapping. Do _not_ use directly!
  256. * We should really eliminate virt_to_bus() here - it's deprecated.
  257. */
  258. #ifndef __arch_page_to_dma
  259. #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
  260. #define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr))
  261. #define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
  262. #else
  263. #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page))
  264. #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr))
  265. #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr))
  266. #endif
  267. /*
  268. * Optional coherency support. Currently used only by selected
  269. * Intel XSC3-based systems.
  270. */
  271. #ifndef arch_is_coherent
  272. #define arch_is_coherent() 0
  273. #endif
  274. #endif
  275. #include <asm-generic/memory_model.h>
  276. #endif