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 u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 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_alloc_nid(phys_addr_t size, phys_addr_t align,
  65                                         int nid);
  66 extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
  67                                             int nid);
  68
  69 extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
  70
  71 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
  72 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
  73 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
  74
  75 extern phys_addr_t memblock_alloc_base(phys_addr_t size,
  76                                          phys_addr_t align,
  77                                          phys_addr_t max_addr);
  78 extern phys_addr_t __memblock_alloc_base(phys_addr_t size,
  79                                            phys_addr_t align,
  80                                            phys_addr_t max_addr);
  81 extern phys_addr_t memblock_phys_mem_size(void);
  82 extern phys_addr_t memblock_end_of_DRAM(void);
  83 extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
  84 extern int memblock_is_memory(phys_addr_t addr);
  85 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  86 extern int memblock_is_reserved(phys_addr_t addr);
  87 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  88
  89 extern void memblock_dump_all(void);
  90
  91 /* Provided by the architecture */
  92 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
  93 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  94                                    phys_addr_t addr2, phys_addr_t size2);
  95
  96 /**
  97  * memblock_set_current_limit - Set the current allocation limit to allow
  98  *                         limiting allocations to what is currently
  99  *                         accessible during boot
 100  * @limit: New limit value (physical address)
 101  */
 102 extern void memblock_set_current_limit(phys_addr_t limit);
 103
 104
 105 /*
 106  * pfn conversion functions
 107  *
 108  * While the memory MEMBLOCKs should always be page aligned, the reserved
 109  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 110  * idea of what they return for such non aligned MEMBLOCKs.
 111  */
 112
 113 /**
 114  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 115  * @reg: memblock_region structure
 116  */
 117 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 118 {
 119         return PFN_UP(reg->base);
 120 }
 121
 122 /**
 123  * memblock_region_memory_end_pfn - Return the end_pfn this region
 124  * @reg: memblock_region structure
 125  */
 126 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 127 {
 128         return PFN_DOWN(reg->base + reg->size);
 129 }
 130
 131 /**
 132  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 133  * @reg: memblock_region structure
 134  */
 135 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 136 {
 137         return PFN_DOWN(reg->base);
 138 }
 139
 140 /**
 141  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 142  * @reg: memblock_region structure
 143  */
 144 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 145 {
 146         return PFN_UP(reg->base + reg->size);
 147 }
 148
 149 #define for_each_memblock(memblock_type, region)                                        \
 150         for (region = memblock.memblock_type.regions;                           \
 151              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 152              region++)
 153
 154
 155 #ifdef ARCH_DISCARD_MEMBLOCK
 156 #define __init_memblock __init
 157 #define __initdata_memblock __initdata
 158 #else
 159 #define __init_memblock
 160 #define __initdata_memblock
 161 #endif
 162
 163 #endif /* CONFIG_HAVE_MEMBLOCK */
 164
 165 #endif /* __KERNEL__ */
 166
 167 #endif /* _LINUX_MEMBLOCK_H */