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 INIT_MEMBLOCK_REGIONS 128
  22
  23 struct memblock_region {
  24         phys_addr_t base;
  25         phys_addr_t size;
  26 };
  27
  28 struct memblock_type {
  29         unsigned long cnt;      /* number of regions */
  30         unsigned long max;      /* size of the allocated array */
  31         struct memblock_region *regions;
  32 };
  33
  34 struct memblock {
  35         phys_addr_t current_limit;
  36         phys_addr_t memory_size;        /* Updated by memblock_analyze() */
  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(phys_addr_t base, phys_addr_t size);
  46 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
  47 extern long __init memblock_free(phys_addr_t base, phys_addr_t size);
  48 extern long __init memblock_reserve(phys_addr_t base, phys_addr_t size);
  49
  50 /* The numa aware allocator is only available if
  51  * CONFIG_ARCH_POPULATES_NODE_MAP is set
  52  */
  53 extern phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
  54                                         int nid);
  55 extern phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
  56                                             int nid);
  57
  58 extern phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align);
  59
  60 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
  61 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
  62 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
  63
  64 extern phys_addr_t __init memblock_alloc_base(phys_addr_t size,
  65                                          phys_addr_t align,
  66                                          phys_addr_t max_addr);
  67 extern phys_addr_t __init __memblock_alloc_base(phys_addr_t size,
  68                                            phys_addr_t align,
  69                                            phys_addr_t max_addr);
  70 extern phys_addr_t __init memblock_phys_mem_size(void);
  71 extern phys_addr_t memblock_end_of_DRAM(void);
  72 extern void __init memblock_enforce_memory_limit(phys_addr_t memory_limit);
  73 extern int memblock_is_memory(phys_addr_t addr);
  74 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  75 extern int __init memblock_is_reserved(phys_addr_t addr);
  76 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  77
  78 extern void memblock_dump_all(void);
  79
  80 /* Provided by the architecture */
  81 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
  82 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  83                                    phys_addr_t addr2, phys_addr_t size2);
  84
  85 /**
  86  * memblock_set_current_limit - Set the current allocation limit to allow
  87  *                         limiting allocations to what is currently
  88  *                         accessible during boot
  89  * @limit: New limit value (physical address)
  90  */
  91 extern void memblock_set_current_limit(phys_addr_t limit);
  92
  93
  94 /*
  95  * pfn conversion functions
  96  *
  97  * While the memory MEMBLOCKs should always be page aligned, the reserved
  98  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
  99  * idea of what they return for such non aligned MEMBLOCKs.
 100  */
 101
 102 /**
 103  * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
 104  * @reg: memblock_region structure
 105  */
 106 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
 107 {
 108         return reg->base >> PAGE_SHIFT;
 109 }
 110
 111 /**
 112  * memblock_region_last_pfn - Return the highest pfn intersecting with the region
 113  * @reg: memblock_region structure
 114  */
 115 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
 116 {
 117         return (reg->base + reg->size - 1) >> PAGE_SHIFT;
 118 }
 119
 120 /**
 121  * memblock_region_end_pfn - Return the pfn of the first page following the region
 122  *                      but not intersecting it
 123  * @reg: memblock_region structure
 124  */
 125 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
 126 {
 127         return memblock_region_last_pfn(reg) + 1;
 128 }
 129
 130 /**
 131  * memblock_region_pages - Return the number of pages covering a region
 132  * @reg: memblock_region structure
 133  */
 134 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
 135 {
 136         return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
 137 }
 138
 139 #define for_each_memblock(memblock_type, region)                                        \
 140         for (region = memblock.memblock_type.regions;                           \
 141              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 142              region++)
 143
 144
 145 #endif /* __KERNEL__ */
 146
 147 #endif /* _LINUX_MEMBLOCK_H */