include/linux/memblock.h

   1 #ifndef _LINUX_MEMBLOCK_H
   2 #define _LINUX_MEMBLOCK_H
   3 #ifdef __KERNEL__
   4
   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
  16 #include <linux/init.h>
  17 #include <linux/mm.h>
  18
  19 #include <asm/memblock.h>
  20
  21 #define MAX_MEMBLOCK_REGIONS 128
  22
  23 struct memblock_region {
  24         u64 base;
  25         u64 size;
  26 };
  27
  28 struct memblock_type {
  29         unsigned long cnt;
  30         u64 size;
  31         struct memblock_region regions[MAX_MEMBLOCK_REGIONS+1];
  32 };
  33
  34 struct memblock {
  35         unsigned long debug;
  36         u64 rmo_size;
  37         struct memblock_type memory;
  38         struct memblock_type reserved;
  39 };
  40
  41 extern struct memblock memblock;
  42
  43 extern void __init memblock_init(void);
  44 extern void __init memblock_analyze(void);
  45 extern long memblock_add(u64 base, u64 size);
  46 extern long memblock_remove(u64 base, u64 size);
  47 extern long __init memblock_free(u64 base, u64 size);
  48 extern long __init memblock_reserve(u64 base, u64 size);
  49 extern u64 __init memblock_alloc_nid(u64 size, u64 align, int nid,
  50                                 u64 (*nid_range)(u64, u64, int *));
  51 extern u64 __init memblock_alloc(u64 size, u64 align);
  52 extern u64 __init memblock_alloc_base(u64 size,
  53                 u64, u64 max_addr);
  54 extern u64 __init __memblock_alloc_base(u64 size,
  55                 u64 align, u64 max_addr);
  56 extern u64 __init memblock_phys_mem_size(void);
  57 extern u64 memblock_end_of_DRAM(void);
  58 extern void __init memblock_enforce_memory_limit(u64 memory_limit);
  59 extern int memblock_is_memory(u64 addr);
  60 extern int memblock_is_region_memory(u64 base, u64 size);
  61 extern int __init memblock_is_reserved(u64 addr);
  62 extern int memblock_is_region_reserved(u64 base, u64 size);
  63 extern int memblock_find(struct memblock_region *res);
  64
  65 extern void memblock_dump_all(void);
  66
  67 /* Obsolete accessors */
  68 static inline u64
  69 memblock_size_bytes(struct memblock_type *type, unsigned long region_nr)
  70 {
  71         return type->regions[region_nr].size;
  72 }
  73 static inline u64
  74 memblock_size_pages(struct memblock_type *type, unsigned long region_nr)
  75 {
  76         return memblock_size_bytes(type, region_nr) >> PAGE_SHIFT;
  77 }
  78 static inline u64
  79 memblock_start_pfn(struct memblock_type *type, unsigned long region_nr)
  80 {
  81         return type->regions[region_nr].base >> PAGE_SHIFT;
  82 }
  83 static inline u64
  84 memblock_end_pfn(struct memblock_type *type, unsigned long region_nr)
  85 {
  86         return memblock_start_pfn(type, region_nr) +
  87                memblock_size_pages(type, region_nr);
  88 }
  89
  90 /*
  91  * pfn conversion functions
  92  *
  93  * While the memory MEMBLOCKs should always be page aligned, the reserved
  94  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
  95  * idea of what they return for such non aligned MEMBLOCKs.
  96  */
  97
  98 /**
  99  * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
 100  * @reg: memblock_region structure
 101  */
 102 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
 103 {
 104         return reg->base >> PAGE_SHIFT;
 105 }
 106
 107 /**
 108  * memblock_region_last_pfn - Return the highest pfn intersecting with the region
 109  * @reg: memblock_region structure
 110  */
 111 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
 112 {
 113         return (reg->base + reg->size - 1) >> PAGE_SHIFT;
 114 }
 115
 116 /**
 117  * memblock_region_end_pfn - Return the pfn of the first page following the region
 118  *                      but not intersecting it
 119  * @reg: memblock_region structure
 120  */
 121 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
 122 {
 123         return memblock_region_last_pfn(reg) + 1;
 124 }
 125
 126 /**
 127  * memblock_region_pages - Return the number of pages covering a region
 128  * @reg: memblock_region structure
 129  */
 130 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
 131 {
 132         return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
 133 }
 134
 135 #define for_each_memblock(memblock_type, region)                                        \
 136         for (region = memblock.memblock_type.regions;                           \
 137              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 138              region++)
 139
 140
 141 #endif /* __KERNEL__ */
 142
 143 #endif /* _LINUX_MEMBLOCK_H */