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bootmem.h
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1 /*
2  * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
3  */
4 #ifndef _LINUX_BOOTMEM_H
5 #define _LINUX_BOOTMEM_H
6 
7 #include <linux/mmzone.h>
8 #include <asm/dma.h>
9 
10 /*
11  * simple boot-time physical memory area allocator.
12  */
13 
14 extern unsigned long max_low_pfn;
15 extern unsigned long min_low_pfn;
16 
17 /*
18  * highest page
19  */
20 extern unsigned long max_pfn;
21 
22 #ifndef CONFIG_NO_BOOTMEM
23 /*
24  * node_bootmem_map is a map pointer - the bits represent all physical
25  * memory pages (including holes) on the node.
26  */
27 typedef struct bootmem_data {
28  unsigned long node_min_pfn;
29  unsigned long node_low_pfn;
30  void *node_bootmem_map;
31  unsigned long last_end_off;
32  unsigned long hint_idx;
33  struct list_head list;
34 } bootmem_data_t;
35 
36 extern bootmem_data_t bootmem_node_data[];
37 #endif
38 
39 extern unsigned long bootmem_bootmap_pages(unsigned long);
40 
41 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
42  unsigned long freepfn,
43  unsigned long startpfn,
44  unsigned long endpfn);
45 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
46 
47 extern unsigned long free_low_memory_core_early(int nodeid);
48 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
49 extern unsigned long free_all_bootmem(void);
50 
51 extern void free_bootmem_node(pg_data_t *pgdat,
52  unsigned long addr,
53  unsigned long size);
54 extern void free_bootmem(unsigned long addr, unsigned long size);
55 extern void free_bootmem_late(unsigned long addr, unsigned long size);
56 
57 /*
58  * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
59  * the architecture-specific code should honor this).
60  *
61  * If flags is 0, then the return value is always 0 (success). If
62  * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
63  * memory already was reserved.
64  */
65 #define BOOTMEM_DEFAULT 0
66 #define BOOTMEM_EXCLUSIVE (1<<0)
67 
68 extern int reserve_bootmem(unsigned long addr,
69  unsigned long size,
70  int flags);
71 extern int reserve_bootmem_node(pg_data_t *pgdat,
72  unsigned long physaddr,
73  unsigned long size,
74  int flags);
75 
76 extern void *__alloc_bootmem(unsigned long size,
77  unsigned long align,
78  unsigned long goal);
79 extern void *__alloc_bootmem_nopanic(unsigned long size,
80  unsigned long align,
81  unsigned long goal);
82 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
83  unsigned long size,
84  unsigned long align,
85  unsigned long goal);
86 void *__alloc_bootmem_node_high(pg_data_t *pgdat,
87  unsigned long size,
88  unsigned long align,
89  unsigned long goal);
90 extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
91  unsigned long size,
92  unsigned long align,
93  unsigned long goal);
94 void *___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
95  unsigned long size,
96  unsigned long align,
97  unsigned long goal,
98  unsigned long limit);
99 extern void *__alloc_bootmem_low(unsigned long size,
100  unsigned long align,
101  unsigned long goal);
102 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
103  unsigned long size,
104  unsigned long align,
105  unsigned long goal);
106 
107 #ifdef CONFIG_NO_BOOTMEM
108 /* We are using top down, so it is safe to use 0 here */
109 #define BOOTMEM_LOW_LIMIT 0
110 #else
111 #define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
112 #endif
113 
114 #define alloc_bootmem(x) \
115  __alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
116 #define alloc_bootmem_align(x, align) \
117  __alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
118 #define alloc_bootmem_nopanic(x) \
119  __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
120 #define alloc_bootmem_pages(x) \
121  __alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
122 #define alloc_bootmem_pages_nopanic(x) \
123  __alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
124 #define alloc_bootmem_node(pgdat, x) \
125  __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
126 #define alloc_bootmem_node_nopanic(pgdat, x) \
127  __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
128 #define alloc_bootmem_pages_node(pgdat, x) \
129  __alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
130 #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
131  __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
132 
133 #define alloc_bootmem_low(x) \
134  __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
135 #define alloc_bootmem_low_pages(x) \
136  __alloc_bootmem_low(x, PAGE_SIZE, 0)
137 #define alloc_bootmem_low_pages_node(pgdat, x) \
138  __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
139 
140 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
141  int flags);
142 
143 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
144 extern void *alloc_remap(int nid, unsigned long size);
145 #else
146 static inline void *alloc_remap(int nid, unsigned long size)
147 {
148  return NULL;
149 }
150 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
151 
152 extern void *alloc_large_system_hash(const char *tablename,
153  unsigned long bucketsize,
154  unsigned long numentries,
155  int scale,
156  int flags,
157  unsigned int *_hash_shift,
158  unsigned int *_hash_mask,
159  unsigned long low_limit,
160  unsigned long high_limit);
161 
162 #define HASH_EARLY 0x00000001 /* Allocating during early boot? */
163 #define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min
164  * shift passed via *_hash_shift */
165 
166 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
167  * sufficient vmalloc space.
168  */
169 #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
170 #define HASHDIST_DEFAULT 1
171 #else
172 #define HASHDIST_DEFAULT 0
173 #endif
174 extern int hashdist; /* Distribute hashes across NUMA nodes? */
175 
176 
177 #endif /* _LINUX_BOOTMEM_H */
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