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