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
  64 extern void memblock_dump_all(void);
  65
  66 /*
  67  * pfn conversion functions
  68  *
  69  * While the memory MEMBLOCKs should always be page aligned, the reserved
  70  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
  71  * idea of what they return for such non aligned MEMBLOCKs.
  72  */
  73
  74 /**
  75  * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
  76  * @reg: memblock_region structure
  77  */
  78 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
  79 {
  80         return reg->base >> PAGE_SHIFT;
  81 }
  82
  83 /**
  84  * memblock_region_last_pfn - Return the highest pfn intersecting with the region
  85  * @reg: memblock_region structure
  86  */
  87 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
  88 {
  89         return (reg->base + reg->size - 1) >> PAGE_SHIFT;
  90 }
  91
  92 /**
  93  * memblock_region_end_pfn - Return the pfn of the first page following the region
  94  *                      but not intersecting it
  95  * @reg: memblock_region structure
  96  */
  97 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
  98 {
  99         return memblock_region_last_pfn(reg) + 1;
 100 }
 101
 102 /**
 103  * memblock_region_pages - Return the number of pages covering a region
 104  * @reg: memblock_region structure
 105  */
 106 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
 107 {
 108         return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
 109 }
 110
 111 #define for_each_memblock(memblock_type, region)                                        \
 112         for (region = memblock.memblock_type.regions;                           \
 113              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 114              region++)
 115
 116
 117 #endif /* __KERNEL__ */
 118
 119 #endif /* _LINUX_MEMBLOCK_H */