include/linux/memblock.h

   1 #ifndef _LINUX_MEMBLOCK_H
   2 #define _LINUX_MEMBLOCK_H
   3 #ifdef __KERNEL__
   4
   5 #define MEMBLOCK_ERROR  0
   6
   7 #ifdef CONFIG_HAVE_MEMBLOCK
   8 /*
   9  * Logical memory blocks.
  10  *
  11  * Copyright (C) 2001 Peter Bergner, IBM Corp.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version
  16  * 2 of the License, or (at your option) any later version.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21
  22 #include <asm/memblock.h>
  23
  24 #define INIT_MEMBLOCK_REGIONS   128
  25
  26 struct memblock_region {
  27         phys_addr_t base;
  28         phys_addr_t size;
  29 };
  30
  31 struct memblock_type {
  32         unsigned long cnt;      /* number of regions */
  33         unsigned long max;      /* size of the allocated array */
  34         struct memblock_region *regions;
  35 };
  36
  37 struct memblock {
  38         phys_addr_t current_limit;
  39         phys_addr_t memory_size;        /* Updated by memblock_analyze() */
  40         struct memblock_type memory;
  41         struct memblock_type reserved;
  42 };
  43
  44 extern struct memblock memblock;
  45 extern int memblock_debug;
  46 extern int memblock_can_resize;
  47
  48 #define memblock_dbg(fmt, ...) \
  49         if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  50
  51 u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 align);
  52 int memblock_free_reserved_regions(void);
  53 int memblock_reserve_reserved_regions(void);
  54
  55 extern void memblock_init(void);
  56 extern void memblock_analyze(void);
  57 extern long memblock_add(phys_addr_t base, phys_addr_t size);
  58 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
  59 extern long memblock_free(phys_addr_t base, phys_addr_t size);
  60 extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
  61
  62 /* The numa aware allocator is only available if
  63  * CONFIG_ARCH_POPULATES_NODE_MAP is set
  64  */
  65 extern phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
  66                                         int nid);
  67 extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
  68                                             int nid);
  69
  70 extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
  71
  72 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
  73 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
  74 #define MEMBLOCK_ALLOC_ACCESSIBLE       0
  75
  76 extern phys_addr_t memblock_alloc_base(phys_addr_t size,
  77                                          phys_addr_t align,
  78                                          phys_addr_t max_addr);
  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_phys_mem_size(void);
  83 extern phys_addr_t memblock_start_of_DRAM(void);
  84 extern phys_addr_t memblock_end_of_DRAM(void);
  85 extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
  86 extern int memblock_is_memory(phys_addr_t addr);
  87 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  88 extern int memblock_is_reserved(phys_addr_t addr);
  89 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  90
  91 extern void memblock_dump_all(void);
  92
  93 /* Provided by the architecture */
  94 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
  95 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  96                                    phys_addr_t addr2, phys_addr_t size2);
  97
  98 /**
  99  * memblock_set_current_limit - Set the current allocation limit to allow
 100  *                         limiting allocations to what is currently
 101  *                         accessible during boot
 102  * @limit: New limit value (physical address)
 103  */
 104 extern void memblock_set_current_limit(phys_addr_t limit);
 105
 106
 107 /*
 108  * pfn conversion functions
 109  *
 110  * While the memory MEMBLOCKs should always be page aligned, the reserved
 111  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 112  * idea of what they return for such non aligned MEMBLOCKs.
 113  */
 114
 115 /**
 116  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 117  * @reg: memblock_region structure
 118  */
 119 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 120 {
 121         return PFN_UP(reg->base);
 122 }
 123
 124 /**
 125  * memblock_region_memory_end_pfn - Return the end_pfn this region
 126  * @reg: memblock_region structure
 127  */
 128 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 129 {
 130         return PFN_DOWN(reg->base + reg->size);
 131 }
 132
 133 /**
 134  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 135  * @reg: memblock_region structure
 136  */
 137 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 138 {
 139         return PFN_DOWN(reg->base);
 140 }
 141
 142 /**
 143  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 144  * @reg: memblock_region structure
 145  */
 146 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 147 {
 148         return PFN_UP(reg->base + reg->size);
 149 }
 150
 151 #define for_each_memblock(memblock_type, region)                                        \
 152         for (region = memblock.memblock_type.regions;                           \
 153              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 154              region++)
 155
 156
 157 #ifdef ARCH_DISCARD_MEMBLOCK
 158 #define __init_memblock __init
 159 #define __initdata_memblock __initdata
 160 #else
 161 #define __init_memblock
 162 #define __initdata_memblock
 163 #endif
 164
 165 #else
 166 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 167 {
 168         return MEMBLOCK_ERROR;
 169 }
 170
 171 #endif /* CONFIG_HAVE_MEMBLOCK */
 172
 173 #endif /* __KERNEL__ */
 174
 175 #endif /* _LINUX_MEMBLOCK_H */