1 #ifndef _LINUX_MEMBLOCK_H
2 #define _LINUX_MEMBLOCK_H
6 * Logical memory blocks.
8 * Copyright (C) 2001 Peter Bergner, IBM Corp.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/init.h>
19 #include <asm/memblock.h>
21 #define INIT_MEMBLOCK_REGIONS 128
23 struct memblock_region {
28 struct memblock_type {
29 unsigned long cnt; /* number of regions */
30 unsigned long max; /* size of the allocated array */
31 struct memblock_region *regions;
35 phys_addr_t current_limit;
36 phys_addr_t memory_size; /* Updated by memblock_analyze() */
37 struct memblock_type memory;
38 struct memblock_type reserved;
41 extern struct memblock memblock;
43 extern void __init memblock_init(void);
44 extern void __init memblock_analyze(void);
45 extern long memblock_add(phys_addr_t base, phys_addr_t size);
46 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
47 extern long __init memblock_free(phys_addr_t base, phys_addr_t size);
48 extern long __init memblock_reserve(phys_addr_t base, phys_addr_t size);
50 /* The numa aware allocator is only available if
51 * CONFIG_ARCH_POPULATES_NODE_MAP is set
53 extern phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
54 extern phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align);
56 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
57 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
58 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
60 extern phys_addr_t __init memblock_alloc_base(phys_addr_t size,
62 phys_addr_t max_addr);
63 extern phys_addr_t __init __memblock_alloc_base(phys_addr_t size,
65 phys_addr_t max_addr);
66 extern phys_addr_t __init memblock_phys_mem_size(void);
67 extern phys_addr_t memblock_end_of_DRAM(void);
68 extern void __init memblock_enforce_memory_limit(phys_addr_t memory_limit);
69 extern int memblock_is_memory(phys_addr_t addr);
70 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
71 extern int __init memblock_is_reserved(phys_addr_t addr);
72 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
74 extern void memblock_dump_all(void);
76 /* Provided by the architecture */
77 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
78 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
79 phys_addr_t addr2, phys_addr_t size2);
82 * memblock_set_current_limit - Set the current allocation limit to allow
83 * limiting allocations to what is currently
84 * accessible during boot
85 * @limit: New limit value (physical address)
87 extern void memblock_set_current_limit(phys_addr_t limit);
91 * pfn conversion functions
93 * While the memory MEMBLOCKs should always be page aligned, the reserved
94 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
95 * idea of what they return for such non aligned MEMBLOCKs.
99 * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
100 * @reg: memblock_region structure
102 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
104 return reg->base >> PAGE_SHIFT;
108 * memblock_region_last_pfn - Return the highest pfn intersecting with the region
109 * @reg: memblock_region structure
111 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
113 return (reg->base + reg->size - 1) >> PAGE_SHIFT;
117 * memblock_region_end_pfn - Return the pfn of the first page following the region
118 * but not intersecting it
119 * @reg: memblock_region structure
121 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
123 return memblock_region_last_pfn(reg) + 1;
127 * memblock_region_pages - Return the number of pages covering a region
128 * @reg: memblock_region structure
130 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
132 return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
135 #define for_each_memblock(memblock_type, region) \
136 for (region = memblock.memblock_type.regions; \
137 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
141 #endif /* __KERNEL__ */
143 #endif /* _LINUX_MEMBLOCK_H */