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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 #define INIT_MEMBLOCK_REGIONS 128
21
22 struct memblock_region {
23 phys_addr_t base;
24 phys_addr_t size;
25 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
26 int nid;
27 #endif
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 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
51 phys_addr_t size, phys_addr_t 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 extern void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
63 phys_addr_t *out_end, int *out_nid);
64
65 /**
66 * for_each_free_mem_range - iterate through free memblock areas
67 * @i: u64 used as loop variable
68 * @nid: node selector, %MAX_NUMNODES for all nodes
69 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
70 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
71 * @p_nid: ptr to int for nid of the range, can be %NULL
72 *
73 * Walks over free (memory && !reserved) areas of memblock. Available as
74 * soon as memblock is initialized.
75 */
76 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \
77 for (i = 0, \
78 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \
79 i != (u64)ULLONG_MAX; \
80 __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
81
82 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
83 extern int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
84
85 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
86 {
87 r->nid = nid;
88 }
89
90 static inline int memblock_get_region_node(const struct memblock_region *r)
91 {
92 return r->nid;
93 }
94 #else
95 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
96 {
97 }
98
99 static inline int memblock_get_region_node(const struct memblock_region *r)
100 {
101 return 0;
102 }
103 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
104
105 /* The numa aware allocator is only available if
106 * CONFIG_ARCH_POPULATES_NODE_MAP is set
107 */
108 extern phys_addr_t memblock_find_in_range_node(phys_addr_t start,
109 phys_addr_t end,
110 phys_addr_t size,
111 phys_addr_t align, int nid);
112 extern phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
113 int nid);
114 extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
115 int nid);
116
117 extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
118
119 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
120 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
121 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
122
123 extern phys_addr_t memblock_alloc_base(phys_addr_t size,
124 phys_addr_t align,
125 phys_addr_t max_addr);
126 extern phys_addr_t __memblock_alloc_base(phys_addr_t size,
127 phys_addr_t align,
128 phys_addr_t max_addr);
129 extern phys_addr_t memblock_phys_mem_size(void);
130 extern phys_addr_t memblock_start_of_DRAM(void);
131 extern phys_addr_t memblock_end_of_DRAM(void);
132 extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
133 extern int memblock_is_memory(phys_addr_t addr);
134 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
135 extern int memblock_is_reserved(phys_addr_t addr);
136 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
137
138 extern void memblock_dump_all(void);
139
140 /**
141 * memblock_set_current_limit - Set the current allocation limit to allow
142 * limiting allocations to what is currently
143 * accessible during boot
144 * @limit: New limit value (physical address)
145 */
146 extern void memblock_set_current_limit(phys_addr_t limit);
147
148
149 /*
150 * pfn conversion functions
151 *
152 * While the memory MEMBLOCKs should always be page aligned, the reserved
153 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
154 * idea of what they return for such non aligned MEMBLOCKs.
155 */
156
157 /**
158 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
159 * @reg: memblock_region structure
160 */
161 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
162 {
163 return PFN_UP(reg->base);
164 }
165
166 /**
167 * memblock_region_memory_end_pfn - Return the end_pfn this region
168 * @reg: memblock_region structure
169 */
170 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
171 {
172 return PFN_DOWN(reg->base + reg->size);
173 }
174
175 /**
176 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
177 * @reg: memblock_region structure
178 */
179 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
180 {
181 return PFN_DOWN(reg->base);
182 }
183
184 /**
185 * memblock_region_reserved_end_pfn - Return the end_pfn this region
186 * @reg: memblock_region structure
187 */
188 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
189 {
190 return PFN_UP(reg->base + reg->size);
191 }
192
193 #define for_each_memblock(memblock_type, region) \
194 for (region = memblock.memblock_type.regions; \
195 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
196 region++)
197
198
199 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
200 #define __init_memblock __meminit
201 #define __initdata_memblock __meminitdata
202 #else
203 #define __init_memblock
204 #define __initdata_memblock
205 #endif
206
207 #else
208 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
209 {
210 return 0;
211 }
212
213 #endif /* CONFIG_HAVE_MEMBLOCK */
214
215 #endif /* __KERNEL__ */
216
217 #endif /* _LINUX_MEMBLOCK_H */