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 #define MEMBLOCK_ERROR          (~(phys_addr_t)0)
  23
  24 struct memblock_region {
  25         phys_addr_t base;
  26         phys_addr_t size;
  27 };
  28
  29 struct memblock_type {
  30         unsigned long cnt;      /* number of regions */
  31         unsigned long max;      /* size of the allocated array */
  32         struct memblock_region *regions;
  33 };
  34
  35 struct memblock {
  36         phys_addr_t current_limit;
  37         phys_addr_t memory_size;        /* Updated by memblock_analyze() */
  38         struct memblock_type memory;
  39         struct memblock_type reserved;
  40 };
  41
  42 extern struct memblock memblock;
  43 extern int memblock_debug;
  44 extern int memblock_can_resize;
  45
  46 #define memblock_dbg(fmt, ...) \
  47         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  48
  49 extern void __init memblock_init(void);
  50 extern void __init memblock_analyze(void);
  51 extern long memblock_add(phys_addr_t base, phys_addr_t size);
  52 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
  53 extern long __init memblock_free(phys_addr_t base, phys_addr_t size);
  54 extern long __init memblock_reserve(phys_addr_t base, phys_addr_t size);
  55
  56 /* The numa aware allocator is only available if
  57  * CONFIG_ARCH_POPULATES_NODE_MAP is set
  58  */
  59 extern phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
  60                                         int nid);
  61 extern phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
  62                                             int nid);
  63
  64 extern phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align);
  65
  66 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
  67 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
  68 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
  69
  70 extern phys_addr_t __init memblock_alloc_base(phys_addr_t size,
  71                                          phys_addr_t align,
  72                                          phys_addr_t max_addr);
  73 extern phys_addr_t __init __memblock_alloc_base(phys_addr_t size,
  74                                            phys_addr_t align,
  75                                            phys_addr_t max_addr);
  76 extern phys_addr_t __init memblock_phys_mem_size(void);
  77 extern phys_addr_t memblock_end_of_DRAM(void);
  78 extern void __init memblock_enforce_memory_limit(phys_addr_t memory_limit);
  79 extern int memblock_is_memory(phys_addr_t addr);
  80 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  81 extern int __init memblock_is_reserved(phys_addr_t addr);
  82 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  83
  84 extern void memblock_dump_all(void);
  85
  86 /* Provided by the architecture */
  87 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
  88 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  89                                    phys_addr_t addr2, phys_addr_t size2);
  90
  91 /**
  92  * memblock_set_current_limit - Set the current allocation limit to allow
  93  *                         limiting allocations to what is currently
  94  *                         accessible during boot
  95  * @limit: New limit value (physical address)
  96  */
  97 extern void memblock_set_current_limit(phys_addr_t limit);
  98
  99
 100 /*
 101  * pfn conversion functions
 102  *
 103  * While the memory MEMBLOCKs should always be page aligned, the reserved
 104  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 105  * idea of what they return for such non aligned MEMBLOCKs.
 106  */
 107
 108 /**
 109  * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
 110  * @reg: memblock_region structure
 111  */
 112 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
 113 {
 114         return reg->base >> PAGE_SHIFT;
 115 }
 116
 117 /**
 118  * memblock_region_last_pfn - Return the highest pfn intersecting with the region
 119  * @reg: memblock_region structure
 120  */
 121 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
 122 {
 123         return (reg->base + reg->size - 1) >> PAGE_SHIFT;
 124 }
 125
 126 /**
 127  * memblock_region_end_pfn - Return the pfn of the first page following the region
 128  *                      but not intersecting it
 129  * @reg: memblock_region structure
 130  */
 131 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
 132 {
 133         return memblock_region_last_pfn(reg) + 1;
 134 }
 135
 136 /**
 137  * memblock_region_pages - Return the number of pages covering a region
 138  * @reg: memblock_region structure
 139  */
 140 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
 141 {
 142         return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
 143 }
 144
 145 #define for_each_memblock(memblock_type, region)                                        \
 146         for (region = memblock.memblock_type.regions;                           \
 147              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 148              region++)
 149
 150
 151 #endif /* __KERNEL__ */
 152
 153 #endif /* _LINUX_MEMBLOCK_H */