memory.h 9.5 KB

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  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. #include <linux/compiler.h>
  16. #include <linux/const.h>
  17. #include <linux/types.h>
  18. #include <linux/sizes.h>
  19. #include <asm/cache.h>
  20. #ifdef CONFIG_NEED_MACH_MEMORY_H
  21. #include <mach/memory.h>
  22. #endif
  23. /*
  24. * Allow for constants defined here to be used from assembly code
  25. * by prepending the UL suffix only with actual C code compilation.
  26. */
  27. #define UL(x) _AC(x, UL)
  28. /* PAGE_OFFSET - the virtual address of the start of the kernel image */
  29. #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
  30. #ifdef CONFIG_MMU
  31. /*
  32. * TASK_SIZE - the maximum size of a user space task.
  33. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  34. */
  35. #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
  36. #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
  37. /*
  38. * The maximum size of a 26-bit user space task.
  39. */
  40. #define TASK_SIZE_26 (UL(1) << 26)
  41. /*
  42. * The module space lives between the addresses given by TASK_SIZE
  43. * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  44. */
  45. #ifndef CONFIG_THUMB2_KERNEL
  46. #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
  47. #else
  48. /* smaller range for Thumb-2 symbols relocation (2^24)*/
  49. #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
  50. #endif
  51. #if TASK_SIZE > MODULES_VADDR
  52. #error Top of user space clashes with start of module space
  53. #endif
  54. /*
  55. * The highmem pkmap virtual space shares the end of the module area.
  56. */
  57. #ifdef CONFIG_HIGHMEM
  58. #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
  59. #else
  60. #define MODULES_END (PAGE_OFFSET)
  61. #endif
  62. /*
  63. * The XIP kernel gets mapped at the bottom of the module vm area.
  64. * Since we use sections to map it, this macro replaces the physical address
  65. * with its virtual address while keeping offset from the base section.
  66. */
  67. #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
  68. /*
  69. * Allow 16MB-aligned ioremap pages
  70. */
  71. #define IOREMAP_MAX_ORDER 24
  72. #else /* CONFIG_MMU */
  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. #define TASK_SIZE UL(0xffffffff)
  80. #ifndef TASK_UNMAPPED_BASE
  81. #define TASK_UNMAPPED_BASE UL(0x00000000)
  82. #endif
  83. #ifndef END_MEM
  84. #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
  85. #endif
  86. /*
  87. * The module can be at any place in ram in nommu mode.
  88. */
  89. #define MODULES_END (END_MEM)
  90. #define MODULES_VADDR PAGE_OFFSET
  91. #define XIP_VIRT_ADDR(physaddr) (physaddr)
  92. #endif /* !CONFIG_MMU */
  93. /*
  94. * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
  95. * locations
  96. */
  97. #ifdef CONFIG_HAVE_TCM
  98. #define ITCM_OFFSET UL(0xfffe0000)
  99. #define DTCM_OFFSET UL(0xfffe8000)
  100. #endif
  101. /*
  102. * Convert a physical address to a Page Frame Number and back
  103. */
  104. #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
  105. #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
  106. /*
  107. * Convert a page to/from a physical address
  108. */
  109. #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
  110. #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
  111. /*
  112. * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed
  113. * around in head.S and proc-*.S are shifted by this amount, in order to
  114. * leave spare high bits for systems with physical address extension. This
  115. * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but
  116. * gives us about 38-bits or so.
  117. */
  118. #ifdef CONFIG_ARM_LPAE
  119. #define ARCH_PGD_SHIFT L1_CACHE_SHIFT
  120. #else
  121. #define ARCH_PGD_SHIFT 0
  122. #endif
  123. #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1)
  124. /*
  125. * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
  126. * memory. This is used for XIP and NoMMU kernels, or by kernels which
  127. * have their own mach/memory.h. Assembly code must always use
  128. * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
  129. */
  130. #ifndef PLAT_PHYS_OFFSET
  131. #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
  132. #endif
  133. #ifndef __ASSEMBLY__
  134. /*
  135. * Physical vs virtual RAM address space conversion. These are
  136. * private definitions which should NOT be used outside memory.h
  137. * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
  138. *
  139. * PFNs are used to describe any physical page; this means
  140. * PFN 0 == physical address 0.
  141. */
  142. #if defined(__virt_to_phys)
  143. #define PHYS_OFFSET PLAT_PHYS_OFFSET
  144. #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
  145. #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
  146. #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
  147. /*
  148. * Constants used to force the right instruction encodings and shifts
  149. * so that all we need to do is modify the 8-bit constant field.
  150. */
  151. #define __PV_BITS_31_24 0x81000000
  152. #define __PV_BITS_7_0 0x81
  153. extern unsigned long __pv_phys_pfn_offset;
  154. extern u64 __pv_offset;
  155. extern void fixup_pv_table(const void *, unsigned long);
  156. extern const void *__pv_table_begin, *__pv_table_end;
  157. #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
  158. #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
  159. #define virt_to_pfn(kaddr) \
  160. ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
  161. PHYS_PFN_OFFSET)
  162. #define __pv_stub(from,to,instr,type) \
  163. __asm__("@ __pv_stub\n" \
  164. "1: " instr " %0, %1, %2\n" \
  165. " .pushsection .pv_table,\"a\"\n" \
  166. " .long 1b\n" \
  167. " .popsection\n" \
  168. : "=r" (to) \
  169. : "r" (from), "I" (type))
  170. #define __pv_stub_mov_hi(t) \
  171. __asm__ volatile("@ __pv_stub_mov\n" \
  172. "1: mov %R0, %1\n" \
  173. " .pushsection .pv_table,\"a\"\n" \
  174. " .long 1b\n" \
  175. " .popsection\n" \
  176. : "=r" (t) \
  177. : "I" (__PV_BITS_7_0))
  178. #define __pv_add_carry_stub(x, y) \
  179. __asm__ volatile("@ __pv_add_carry_stub\n" \
  180. "1: adds %Q0, %1, %2\n" \
  181. " adc %R0, %R0, #0\n" \
  182. " .pushsection .pv_table,\"a\"\n" \
  183. " .long 1b\n" \
  184. " .popsection\n" \
  185. : "+r" (y) \
  186. : "r" (x), "I" (__PV_BITS_31_24) \
  187. : "cc")
  188. static inline phys_addr_t __virt_to_phys(unsigned long x)
  189. {
  190. phys_addr_t t;
  191. if (sizeof(phys_addr_t) == 4) {
  192. __pv_stub(x, t, "add", __PV_BITS_31_24);
  193. } else {
  194. __pv_stub_mov_hi(t);
  195. __pv_add_carry_stub(x, t);
  196. }
  197. return t;
  198. }
  199. static inline unsigned long __phys_to_virt(phys_addr_t x)
  200. {
  201. unsigned long t;
  202. /*
  203. * 'unsigned long' cast discard upper word when
  204. * phys_addr_t is 64 bit, and makes sure that inline
  205. * assembler expression receives 32 bit argument
  206. * in place where 'r' 32 bit operand is expected.
  207. */
  208. __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
  209. return t;
  210. }
  211. #else
  212. #define PHYS_OFFSET PLAT_PHYS_OFFSET
  213. #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
  214. static inline phys_addr_t __virt_to_phys(unsigned long x)
  215. {
  216. return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
  217. }
  218. static inline unsigned long __phys_to_virt(phys_addr_t x)
  219. {
  220. return x - PHYS_OFFSET + PAGE_OFFSET;
  221. }
  222. #define virt_to_pfn(kaddr) \
  223. ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
  224. PHYS_PFN_OFFSET)
  225. #endif
  226. /*
  227. * These are *only* valid on the kernel direct mapped RAM memory.
  228. * Note: Drivers should NOT use these. They are the wrong
  229. * translation for translating DMA addresses. Use the driver
  230. * DMA support - see dma-mapping.h.
  231. */
  232. static inline phys_addr_t virt_to_phys(const volatile void *x)
  233. {
  234. return __virt_to_phys((unsigned long)(x));
  235. }
  236. static inline void *phys_to_virt(phys_addr_t x)
  237. {
  238. return (void *)__phys_to_virt(x);
  239. }
  240. /*
  241. * Drivers should NOT use these either.
  242. */
  243. #define __pa(x) __virt_to_phys((unsigned long)(x))
  244. #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
  245. #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
  246. extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
  247. /*
  248. * These are for systems that have a hardware interconnect supported alias of
  249. * physical memory for idmap purposes. Most cases should leave these
  250. * untouched.
  251. */
  252. static inline phys_addr_t __virt_to_idmap(unsigned long x)
  253. {
  254. if (arch_virt_to_idmap)
  255. return arch_virt_to_idmap(x);
  256. else
  257. return __virt_to_phys(x);
  258. }
  259. #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
  260. /*
  261. * Virtual <-> DMA view memory address translations
  262. * Again, these are *only* valid on the kernel direct mapped RAM
  263. * memory. Use of these is *deprecated* (and that doesn't mean
  264. * use the __ prefixed forms instead.) See dma-mapping.h.
  265. */
  266. #ifndef __virt_to_bus
  267. #define __virt_to_bus __virt_to_phys
  268. #define __bus_to_virt __phys_to_virt
  269. #define __pfn_to_bus(x) __pfn_to_phys(x)
  270. #define __bus_to_pfn(x) __phys_to_pfn(x)
  271. #endif
  272. #ifdef CONFIG_VIRT_TO_BUS
  273. static inline __deprecated unsigned long virt_to_bus(void *x)
  274. {
  275. return __virt_to_bus((unsigned long)x);
  276. }
  277. static inline __deprecated void *bus_to_virt(unsigned long x)
  278. {
  279. return (void *)__bus_to_virt(x);
  280. }
  281. #endif
  282. /*
  283. * Conversion between a struct page and a physical address.
  284. *
  285. * page_to_pfn(page) convert a struct page * to a PFN number
  286. * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
  287. *
  288. * virt_to_page(k) convert a _valid_ virtual address to struct page *
  289. * virt_addr_valid(k) indicates whether a virtual address is valid
  290. */
  291. #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
  292. #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
  293. #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
  294. && pfn_valid(virt_to_pfn(kaddr)))
  295. #endif
  296. #include <asm-generic/memory_model.h>
  297. #endif