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
  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 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
  50                                    phys_addr_t size, phys_addr_t align);
  51 int memblock_free_reserved_regions(void);
  52 int memblock_reserve_reserved_regions(void);
  53
  54 extern void memblock_init(void);
  55 extern void memblock_analyze(void);
  56 extern long memblock_add(phys_addr_t base, phys_addr_t size);
  57 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
  58 extern long memblock_free(phys_addr_t base, phys_addr_t size);
  59 extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
  60
  61 /* The numa aware allocator is only available if
  62  * CONFIG_ARCH_POPULATES_NODE_MAP is set
  63  */
  64 extern phys_addr_t memblock_find_in_range_node(phys_addr_t start,
  65                                                phys_addr_t end,
  66                                                phys_addr_t size,
  67                                                phys_addr_t align, int nid);
  68 extern phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
  69                                         int nid);
  70 extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
  71                                             int nid);
  72
  73 extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
  74
  75 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
  76 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
  77 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
  78
  79 extern phys_addr_t memblock_alloc_base(phys_addr_t size,
  80                                          phys_addr_t align,
  81                                          phys_addr_t max_addr);
  82 extern phys_addr_t __memblock_alloc_base(phys_addr_t size,
  83                                            phys_addr_t align,
  84                                            phys_addr_t max_addr);
  85 extern phys_addr_t memblock_phys_mem_size(void);
  86 extern phys_addr_t memblock_end_of_DRAM(void);
  87 extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
  88 extern int memblock_is_memory(phys_addr_t addr);
  89 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  90 extern int memblock_is_reserved(phys_addr_t addr);
  91 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  92
  93 extern void memblock_dump_all(void);
  94
  95 /* Provided by the architecture */
  96 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  97                                    phys_addr_t addr2, phys_addr_t size2);
  98
  99 /**
 100  * memblock_set_current_limit - Set the current allocation limit to allow
 101  *                         limiting allocations to what is currently
 102  *                         accessible during boot
 103  * @limit: New limit value (physical address)
 104  */
 105 extern void memblock_set_current_limit(phys_addr_t limit);
 106
 107
 108 /*
 109  * pfn conversion functions
 110  *
 111  * While the memory MEMBLOCKs should always be page aligned, the reserved
 112  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 113  * idea of what they return for such non aligned MEMBLOCKs.
 114  */
 115
 116 /**
 117  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 118  * @reg: memblock_region structure
 119  */
 120 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 121 {
 122         return PFN_UP(reg->base);
 123 }
 124
 125 /**
 126  * memblock_region_memory_end_pfn - Return the end_pfn this region
 127  * @reg: memblock_region structure
 128  */
 129 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 130 {
 131         return PFN_DOWN(reg->base + reg->size);
 132 }
 133
 134 /**
 135  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 136  * @reg: memblock_region structure
 137  */
 138 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 139 {
 140         return PFN_DOWN(reg->base);
 141 }
 142
 143 /**
 144  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 145  * @reg: memblock_region structure
 146  */
 147 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 148 {
 149         return PFN_UP(reg->base + reg->size);
 150 }
 151
 152 #define for_each_memblock(memblock_type, region)                                        \
 153         for (region = memblock.memblock_type.regions;                           \
 154              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 155              region++)
 156
 157
 158 #ifdef ARCH_DISCARD_MEMBLOCK
 159 #define __init_memblock __init
 160 #define __initdata_memblock __initdata
 161 #else
 162 #define __init_memblock
 163 #define __initdata_memblock
 164 #endif
 165
 166 #else
 167 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 168 {
 169         return 0;
 170 }
 171
 172 #endif /* CONFIG_HAVE_MEMBLOCK */
 173
 174 #endif /* __KERNEL__ */
 175
 176 #endif /* _LINUX_MEMBLOCK_H */