memblock.h 4.8 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156
  1. #ifndef _LINUX_MEMBLOCK_H
  2. #define _LINUX_MEMBLOCK_H
  3. #ifdef __KERNEL__
  4. #ifdef CONFIG_HAVE_MEMBLOCK
  5. /*
  6. * Logical memory blocks.
  7. *
  8. * Copyright (C) 2001 Peter Bergner, IBM Corp.
  9. *
  10. * This program is free software; you can redistribute it and/or
  11. * modify it under the terms of the GNU General Public License
  12. * as published by the Free Software Foundation; either version
  13. * 2 of the License, or (at your option) any later version.
  14. */
  15. #include <linux/init.h>
  16. #include <linux/mm.h>
  17. #include <asm/memblock.h>
  18. #define INIT_MEMBLOCK_REGIONS 128
  19. #define MEMBLOCK_ERROR 0
  20. struct memblock_region {
  21. phys_addr_t base;
  22. phys_addr_t size;
  23. };
  24. struct memblock_type {
  25. unsigned long cnt; /* number of regions */
  26. unsigned long max; /* size of the allocated array */
  27. struct memblock_region *regions;
  28. };
  29. struct memblock {
  30. phys_addr_t current_limit;
  31. phys_addr_t memory_size; /* Updated by memblock_analyze() */
  32. struct memblock_type memory;
  33. struct memblock_type reserved;
  34. };
  35. extern struct memblock memblock;
  36. extern int memblock_debug;
  37. extern int memblock_can_resize;
  38. #define memblock_dbg(fmt, ...) \
  39. if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  40. extern void __init memblock_init(void);
  41. extern void __init memblock_analyze(void);
  42. extern long memblock_add(phys_addr_t base, phys_addr_t size);
  43. extern long memblock_remove(phys_addr_t base, phys_addr_t size);
  44. extern long __init memblock_free(phys_addr_t base, phys_addr_t size);
  45. extern long __init memblock_reserve(phys_addr_t base, phys_addr_t size);
  46. /* The numa aware allocator is only available if
  47. * CONFIG_ARCH_POPULATES_NODE_MAP is set
  48. */
  49. extern phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
  50. int nid);
  51. extern phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
  52. int nid);
  53. extern phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align);
  54. /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
  55. #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
  56. #define MEMBLOCK_ALLOC_ACCESSIBLE 0
  57. extern phys_addr_t __init memblock_alloc_base(phys_addr_t size,
  58. phys_addr_t align,
  59. phys_addr_t max_addr);
  60. extern phys_addr_t __init __memblock_alloc_base(phys_addr_t size,
  61. phys_addr_t align,
  62. phys_addr_t max_addr);
  63. extern phys_addr_t __init memblock_phys_mem_size(void);
  64. extern phys_addr_t memblock_end_of_DRAM(void);
  65. extern void __init memblock_enforce_memory_limit(phys_addr_t memory_limit);
  66. extern int memblock_is_memory(phys_addr_t addr);
  67. extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  68. extern int __init memblock_is_reserved(phys_addr_t addr);
  69. extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  70. extern void memblock_dump_all(void);
  71. /* Provided by the architecture */
  72. extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
  73. extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  74. phys_addr_t addr2, phys_addr_t size2);
  75. /**
  76. * memblock_set_current_limit - Set the current allocation limit to allow
  77. * limiting allocations to what is currently
  78. * accessible during boot
  79. * @limit: New limit value (physical address)
  80. */
  81. extern void memblock_set_current_limit(phys_addr_t limit);
  82. /*
  83. * pfn conversion functions
  84. *
  85. * While the memory MEMBLOCKs should always be page aligned, the reserved
  86. * MEMBLOCKs may not be. This accessor attempt to provide a very clear
  87. * idea of what they return for such non aligned MEMBLOCKs.
  88. */
  89. /**
  90. * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
  91. * @reg: memblock_region structure
  92. */
  93. static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
  94. {
  95. return reg->base >> PAGE_SHIFT;
  96. }
  97. /**
  98. * memblock_region_last_pfn - Return the highest pfn intersecting with the region
  99. * @reg: memblock_region structure
  100. */
  101. static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
  102. {
  103. return (reg->base + reg->size - 1) >> PAGE_SHIFT;
  104. }
  105. /**
  106. * memblock_region_end_pfn - Return the pfn of the first page following the region
  107. * but not intersecting it
  108. * @reg: memblock_region structure
  109. */
  110. static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
  111. {
  112. return memblock_region_last_pfn(reg) + 1;
  113. }
  114. /**
  115. * memblock_region_pages - Return the number of pages covering a region
  116. * @reg: memblock_region structure
  117. */
  118. static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
  119. {
  120. return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
  121. }
  122. #define for_each_memblock(memblock_type, region) \
  123. for (region = memblock.memblock_type.regions; \
  124. region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
  125. region++)
  126. #endif /* CONFIG_HAVE_MEMBLOCK */
  127. #endif /* __KERNEL__ */
  128. #endif /* _LINUX_MEMBLOCK_H */