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 MAX_MEMBLOCK_REGIONS 128
23 struct memblock_region {
28 struct memblock_type {
31 struct memblock_region regions[MAX_MEMBLOCK_REGIONS+1];
38 struct memblock_type memory;
39 struct memblock_type reserved;
42 extern struct memblock memblock;
44 extern void __init memblock_init(void);
45 extern void __init memblock_analyze(void);
46 extern long memblock_add(u64 base, u64 size);
47 extern long memblock_remove(u64 base, u64 size);
48 extern long __init memblock_free(u64 base, u64 size);
49 extern long __init memblock_reserve(u64 base, u64 size);
51 extern u64 __init memblock_alloc_nid(u64 size, u64 align, int nid);
52 extern u64 __init memblock_alloc(u64 size, u64 align);
54 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
55 #define MEMBLOCK_ALLOC_ANYWHERE (~(u64)0)
56 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
58 extern u64 __init memblock_alloc_base(u64 size,
60 extern u64 __init __memblock_alloc_base(u64 size,
61 u64 align, u64 max_addr);
62 extern u64 __init memblock_phys_mem_size(void);
63 extern u64 memblock_end_of_DRAM(void);
64 extern void __init memblock_enforce_memory_limit(u64 memory_limit);
65 extern int memblock_is_memory(u64 addr);
66 extern int memblock_is_region_memory(u64 base, u64 size);
67 extern int __init memblock_is_reserved(u64 addr);
68 extern int memblock_is_region_reserved(u64 base, u64 size);
70 extern void memblock_dump_all(void);
72 /* Provided by the architecture */
73 extern u64 memblock_nid_range(u64 start, u64 end, int *nid);
76 * memblock_set_current_limit - Set the current allocation limit to allow
77 * limiting allocations to what is currently
78 * accessible during boot
79 * @limit: New limit value (physical address)
81 extern void memblock_set_current_limit(u64 limit);
85 * pfn conversion functions
87 * While the memory MEMBLOCKs should always be page aligned, the reserved
88 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
89 * idea of what they return for such non aligned MEMBLOCKs.
93 * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
94 * @reg: memblock_region structure
96 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
98 return reg->base >> PAGE_SHIFT;
102 * memblock_region_last_pfn - Return the highest pfn intersecting with the region
103 * @reg: memblock_region structure
105 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
107 return (reg->base + reg->size - 1) >> PAGE_SHIFT;
111 * memblock_region_end_pfn - Return the pfn of the first page following the region
112 * but not intersecting it
113 * @reg: memblock_region structure
115 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
117 return memblock_region_last_pfn(reg) + 1;
121 * memblock_region_pages - Return the number of pages covering a region
122 * @reg: memblock_region structure
124 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
126 return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
129 #define for_each_memblock(memblock_type, region) \
130 for (region = memblock.memblock_type.regions; \
131 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
135 #endif /* __KERNEL__ */
137 #endif /* _LINUX_MEMBLOCK_H */