mm: move bootmem descriptors definition to a single place
[linux-3.10.git] / include / linux / bootmem.h
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 #ifdef CONFIG_CRASH_DUMP
23 extern unsigned long saved_max_pfn;
24 #endif
25
26 /*
27  * node_bootmem_map is a map pointer - the bits represent all physical 
28  * memory pages (including holes) on the node.
29  */
30 typedef struct bootmem_data {
31         unsigned long node_boot_start;
32         unsigned long node_low_pfn;
33         void *node_bootmem_map;
34         unsigned long last_offset;
35         unsigned long last_pos;
36         unsigned long last_success;     /* Previous allocation point.  To speed
37                                          * up searching */
38         struct list_head list;
39 } bootmem_data_t;
40
41 extern bootmem_data_t bootmem_node_data[];
42
43 extern unsigned long bootmem_bootmap_pages(unsigned long);
44 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
45 extern void free_bootmem(unsigned long addr, unsigned long size);
46 extern void *__alloc_bootmem(unsigned long size,
47                              unsigned long align,
48                              unsigned long goal);
49 extern void *__alloc_bootmem_nopanic(unsigned long size,
50                                      unsigned long align,
51                                      unsigned long goal);
52 extern void *__alloc_bootmem_low(unsigned long size,
53                                  unsigned long align,
54                                  unsigned long goal);
55 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
56                                       unsigned long size,
57                                       unsigned long align,
58                                       unsigned long goal);
59 extern void *__alloc_bootmem_core(struct bootmem_data *bdata,
60                                   unsigned long size,
61                                   unsigned long align,
62                                   unsigned long goal,
63                                   unsigned long limit);
64
65 /*
66  * flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
67  * the architecture-specific code should honor this)
68  */
69 #define BOOTMEM_DEFAULT         0
70 #define BOOTMEM_EXCLUSIVE       (1<<0)
71
72 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
73 /*
74  * If flags is 0, then the return value is always 0 (success). If
75  * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
76  * memory already was reserved.
77  */
78 extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags);
79 #define alloc_bootmem(x) \
80         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
81 #define alloc_bootmem_low(x) \
82         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
83 #define alloc_bootmem_pages(x) \
84         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
85 #define alloc_bootmem_low_pages(x) \
86         __alloc_bootmem_low(x, PAGE_SIZE, 0)
87 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
88
89 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
90                                    int flags);
91 extern unsigned long free_all_bootmem(void);
92 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
93 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
94                                   unsigned long size,
95                                   unsigned long align,
96                                   unsigned long goal);
97 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
98                                        unsigned long freepfn,
99                                        unsigned long startpfn,
100                                        unsigned long endpfn);
101 extern int reserve_bootmem_node(pg_data_t *pgdat,
102                                  unsigned long physaddr,
103                                  unsigned long size,
104                                  int flags);
105 extern void free_bootmem_node(pg_data_t *pgdat,
106                               unsigned long addr,
107                               unsigned long size);
108 extern void *alloc_bootmem_section(unsigned long size,
109                                    unsigned long section_nr);
110
111 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
112 #define alloc_bootmem_node(pgdat, x) \
113         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
114 #define alloc_bootmem_pages_node(pgdat, x) \
115         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
116 #define alloc_bootmem_low_pages_node(pgdat, x) \
117         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
118 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
119
120 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
121 extern void *alloc_remap(int nid, unsigned long size);
122 #else
123 static inline void *alloc_remap(int nid, unsigned long size)
124 {
125         return NULL;
126 }
127 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
128
129 extern unsigned long __meminitdata nr_kernel_pages;
130 extern unsigned long __meminitdata nr_all_pages;
131
132 extern void *alloc_large_system_hash(const char *tablename,
133                                      unsigned long bucketsize,
134                                      unsigned long numentries,
135                                      int scale,
136                                      int flags,
137                                      unsigned int *_hash_shift,
138                                      unsigned int *_hash_mask,
139                                      unsigned long limit);
140
141 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
142
143 /* Only NUMA needs hash distribution.
144  * IA64 and x86_64 have sufficient vmalloc space.
145  */
146 #if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
147 #define HASHDIST_DEFAULT 1
148 #else
149 #define HASHDIST_DEFAULT 0
150 #endif
151 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
152
153
154 #endif /* _LINUX_BOOTMEM_H */