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_end_of_DRAM(void);
  84 extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
  85 extern int memblock_is_memory(phys_addr_t addr);
  86 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
  87 extern int memblock_is_reserved(phys_addr_t addr);
  88 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
  89
  90 extern void memblock_dump_all(void);
  91
  92 /* Provided by the architecture */
  93 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
  94 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
  95                                    phys_addr_t addr2, phys_addr_t size2);
  96
  97 /**
  98  * memblock_set_current_limit - Set the current allocation limit to allow
  99  *                         limiting allocations to what is currently
 100  *                         accessible during boot
 101  * @limit: New limit value (physical address)
 102  */
 103 extern void memblock_set_current_limit(phys_addr_t limit);
 104
 105
 106 /*
 107  * pfn conversion functions
 108  *
 109  * While the memory MEMBLOCKs should always be page aligned, the reserved
 110  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 111  * idea of what they return for such non aligned MEMBLOCKs.
 112  */
 113
 114 /**
 115  * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
 116  * @reg: memblock_region structure
 117  */
 118 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
 119 {
 120         return PFN_UP(reg->base);
 121 }
 122
 123 /**
 124  * memblock_region_memory_end_pfn - Return the end_pfn this region
 125  * @reg: memblock_region structure
 126  */
 127 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
 128 {
 129         return PFN_DOWN(reg->base + reg->size);
 130 }
 131
 132 /**
 133  * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
 134  * @reg: memblock_region structure
 135  */
 136 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
 137 {
 138         return PFN_DOWN(reg->base);
 139 }
 140
 141 /**
 142  * memblock_region_reserved_end_pfn - Return the end_pfn this region
 143  * @reg: memblock_region structure
 144  */
 145 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
 146 {
 147         return PFN_UP(reg->base + reg->size);
 148 }
 149
 150 #define for_each_memblock(memblock_type, region)                                        \
 151         for (region = memblock.memblock_type.regions;                           \
 152              region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);    \
 153              region++)
 154
 155
 156 #ifdef ARCH_DISCARD_MEMBLOCK
 157 #define __init_memblock __init
 158 #define __initdata_memblock __initdata
 159 #else
 160 #define __init_memblock
 161 #define __initdata_memblock
 162 #endif
 163
 164 #else
 165 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 166 {
 167         return MEMBLOCK_ERROR;
 168 }
 169
 170 #endif /* CONFIG_HAVE_MEMBLOCK */
 171
 172 #endif /* __KERNEL__ */
 173
 174 #endif /* _LINUX_MEMBLOCK_H */