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