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TOMOYO Linux Cross Reference
Linux/include/linux/memblock.h

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  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 */
175 

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