include/linux/memblock.h

   1 #ifndef _LINUX_MEMBLOCK_H
   2 #define _LINUX_MEMBLOCK_H
   3 #ifdef __KERNEL__
   4
   5 #ifdef CONFIG_HAVE_MEMBLOCK
   6 /*
   7  * Logical memory blocks.
   8  *
   9  * Copyright (C) 2001 Peter Bergner, IBM Corp.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/mm.h>
  19
  20 #include <asm/memblock.h>
  21
  22 #define INIT_MEMBLOCK_REGIONS   128
  23 #define MEMBLOCK_ERROR          0
  24
  25 struct memblock_region {
  26         phys_addr_t base;
  27         phys_addr_t size;
  28 };
  29
  30 struct memblock_type {
  31         unsigned long cnt;      /* number of regions */
  32         unsigned long max;      /* size of the allocated array */
  33         struct memblock_region *regions;
  34 };
  35
  36 struct memblock {
  37         phys_addr_t current_limit;
  38         phys_addr_t memory_size;        /* Updated by memblock_analyze() */
  39         struct memblock_type memory;
  40         struct memblock_type reserved;
  41 };
  42
  43 extern struct memblock memblock;
  44 extern int memblock_debug;
  45 extern int memblock_can_resize;
  46
  47 #define memblock_dbg(fmt, ...) \
  48         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  49
  50 extern void __init memblock_init(void);
  51 extern void __init memblock_analyze(void);
  52 extern long memblock_add(phys_addr_t base, phys_addr_t size);
  53 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
  54 extern long __init memblock_free(phys_addr_t base, phys_addr_t size);
  55 extern long __init memblock_reserve(phys_addr_t base, phys_addr_t size);
  56
  57 /* The numa aware allocator is only available if
  58  * CONFIG_ARCH_POPULATES_NODE_MAP is set
  59  */
  60 extern phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
  61                                         int nid);
  62 extern phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
  63                                             int nid);
  64
  65 extern phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align);
  66
  67 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
  68 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
  69 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
  70
  71 extern phys_addr_t __init memblock_alloc_base(phys_addr_t size,
  72                                          phys_addr_t align,
  73                                          phys_addr_t max_addr);
  74 extern phys_addr_t __init __memblock_alloc_base(phys_addr_t size,
  75                                            phys_addr_t align,
  76                                            phys_addr_t max_addr);
  77 extern phys_addr_t __init memblock_phys_mem_size(void);
  78 extern phys_addr_t memblock_end_of_DRAM(void);
  79 extern void __init memblock_enforce_memory_limit(phys_addr_t memory_limit);
  80 extern int memblock_is_memory(phys_addr_t addr);
  81 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  82 extern int __init memblock_is_reserved(phys_addr_t addr);
  83 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  84
  85 extern void memblock_dump_all(void);
  86
  87 /* Provided by the architecture */
  88 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
  89 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  90                                    phys_addr_t addr2, phys_addr_t size2);
  91
  92 /**
  93  * memblock_set_current_limit - Set the current allocation limit to allow
  94  *                         limiting allocations to what is currently
  95  *                         accessible during boot
  96  * @limit: New limit value (physical address)
  97  */
  98 extern void memblock_set_current_limit(phys_addr_t limit);
  99
 100
 101 /*
 102  * pfn conversion functions
 103  *
 104  * While the memory MEMBLOCKs should always be page aligned, the reserved
 105  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 106  * idea of what they return for such non aligned MEMBLOCKs.
 107  */
 108
 109 /**
 110  * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
 111  * @reg: memblock_region structure
 112  */
 113 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
 114 {
 115         return reg->base >> PAGE_SHIFT;
 116 }
 117
 118 /**
 119  * memblock_region_last_pfn - Return the highest pfn intersecting with the region
 120  * @reg: memblock_region structure
 121  */
 122 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
 123 {
 124         return (reg->base + reg->size - 1) >> PAGE_SHIFT;
 125 }
 126
 127 /**
 128  * memblock_region_end_pfn - Return the pfn of the first page following the region
 129  *                      but not intersecting it
 130  * @reg: memblock_region structure
 131  */
 132 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
 133 {
 134         return memblock_region_last_pfn(reg) + 1;
 135 }
 136
 137 /**
 138  * memblock_region_pages - Return the number of pages covering a region
 139  * @reg: memblock_region structure
 140  */
 141 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
 142 {
 143         return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
 144 }
 145
 146 #define for_each_memblock(memblock_type, region)                                        \
 147         for (region = memblock.memblock_type.regions;                           \
 148              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 149              region++)
 150
 151
 152 #ifdef ARCH_DISCARD_MEMBLOCK
 153 #define __init_memblock __init
 154 #define __initdata_memblock __initdata
 155 #else
 156 #define __init_memblock
 157 #define __initdata_memblock
 158 #endif
 159
 160 #endif /* CONFIG_HAVE_MEMBLOCK */
 161
 162 #endif /* __KERNEL__ */
 163
 164 #endif /* _LINUX_MEMBLOCK_H */