b10ec49ee2dda23a50a237e44912e42e4c82599f
[linux-2.6.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_min_pfn;
32         unsigned long node_low_pfn;
33         void *node_bootmem_map;
34         unsigned long last_end_off;
35         unsigned long hint_idx;
36         struct list_head list;
37 } bootmem_data_t;
38
39 extern bootmem_data_t bootmem_node_data[];
40
41 extern unsigned long bootmem_bootmap_pages(unsigned long);
42
43 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
44                                        unsigned long freepfn,
45                                        unsigned long startpfn,
46                                        unsigned long endpfn);
47 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
48
49 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
50 extern unsigned long free_all_bootmem(void);
51
52 extern void free_bootmem_node(pg_data_t *pgdat,
53                               unsigned long addr,
54                               unsigned long size);
55 extern void free_bootmem(unsigned long addr, unsigned long size);
56 extern void free_bootmem_late(unsigned long addr, unsigned long size);
57
58 /*
59  * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
60  * the architecture-specific code should honor this).
61  *
62  * If flags is 0, then the return value is always 0 (success). If
63  * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
64  * memory already was reserved.
65  */
66 #define BOOTMEM_DEFAULT         0
67 #define BOOTMEM_EXCLUSIVE       (1<<0)
68
69 extern int reserve_bootmem(unsigned long addr,
70                            unsigned long size,
71                            int flags);
72 extern int reserve_bootmem_node(pg_data_t *pgdat,
73                                 unsigned long physaddr,
74                                 unsigned long size,
75                                 int flags);
76
77 extern void *__alloc_bootmem(unsigned long size,
78                              unsigned long align,
79                              unsigned long goal);
80 extern void *__alloc_bootmem_nopanic(unsigned long size,
81                                      unsigned long align,
82                                      unsigned long goal);
83 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
84                                   unsigned long size,
85                                   unsigned long align,
86                                   unsigned long goal);
87 extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
88                                   unsigned long size,
89                                   unsigned long align,
90                                   unsigned long goal);
91 extern void *__alloc_bootmem_low(unsigned long size,
92                                  unsigned long align,
93                                  unsigned long goal);
94 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
95                                       unsigned long size,
96                                       unsigned long align,
97                                       unsigned long goal);
98
99 #define alloc_bootmem(x) \
100         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
101 #define alloc_bootmem_nopanic(x) \
102         __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
103 #define alloc_bootmem_pages(x) \
104         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
105 #define alloc_bootmem_pages_nopanic(x) \
106         __alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
107 #define alloc_bootmem_node(pgdat, x) \
108         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
109 #define alloc_bootmem_pages_node(pgdat, x) \
110         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
111 #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
112         __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
113
114 #define alloc_bootmem_low(x) \
115         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
116 #define alloc_bootmem_low_pages(x) \
117         __alloc_bootmem_low(x, PAGE_SIZE, 0)
118 #define alloc_bootmem_low_pages_node(pgdat, x) \
119         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
120
121 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
122                                    int flags);
123
124 extern void *alloc_bootmem_section(unsigned long size,
125                                    unsigned long section_nr);
126
127 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
128 extern void *alloc_remap(int nid, unsigned long size);
129 #else
130 static inline void *alloc_remap(int nid, unsigned long size)
131 {
132         return NULL;
133 }
134 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
135
136 extern void *alloc_large_system_hash(const char *tablename,
137                                      unsigned long bucketsize,
138                                      unsigned long numentries,
139                                      int scale,
140                                      int flags,
141                                      unsigned int *_hash_shift,
142                                      unsigned int *_hash_mask,
143                                      unsigned long limit);
144
145 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
146 #define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
147                                          * shift passed via *_hash_shift */
148
149 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
150  * sufficient vmalloc space.
151  */
152 #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
153 #define HASHDIST_DEFAULT 1
154 #else
155 #define HASHDIST_DEFAULT 0
156 #endif
157 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
158
159
160 #endif /* _LINUX_BOOTMEM_H */