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mm: also use alloc_large_system_hash() for the PID hash table
[~shefty/rdma-dev.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
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 extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
87                                   unsigned long size,
88                                   unsigned long align,
89                                   unsigned long goal);
90 extern void *__alloc_bootmem_low(unsigned long size,
91                                  unsigned long align,
92                                  unsigned long goal);
93 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
94                                       unsigned long size,
95                                       unsigned long align,
96                                       unsigned long goal);
97
98 #define alloc_bootmem(x) \
99         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
100 #define alloc_bootmem_nopanic(x) \
101         __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
102 #define alloc_bootmem_pages(x) \
103         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
104 #define alloc_bootmem_pages_nopanic(x) \
105         __alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
106 #define alloc_bootmem_node(pgdat, x) \
107         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
108 #define alloc_bootmem_pages_node(pgdat, x) \
109         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
110 #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
111         __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
112
113 #define alloc_bootmem_low(x) \
114         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
115 #define alloc_bootmem_low_pages(x) \
116         __alloc_bootmem_low(x, PAGE_SIZE, 0)
117 #define alloc_bootmem_low_pages_node(pgdat, x) \
118         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
119
120 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
121                                    int flags);
122
123 extern void *alloc_bootmem_section(unsigned long size,
124                                    unsigned long section_nr);
125
126 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
127 extern void *alloc_remap(int nid, unsigned long size);
128 #else
129 static inline void *alloc_remap(int nid, unsigned long size)
130 {
131         return NULL;
132 }
133 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
134
135 extern void *alloc_large_system_hash(const char *tablename,
136                                      unsigned long bucketsize,
137                                      unsigned long numentries,
138                                      int scale,
139                                      int flags,
140                                      unsigned int *_hash_shift,
141                                      unsigned int *_hash_mask,
142                                      unsigned long limit);
143
144 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
145 #define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
146                                          * shift passed via *_hash_shift */
147
148 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
149  * sufficient vmalloc space.
150  */
151 #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
152 #define HASHDIST_DEFAULT 1
153 #else
154 #define HASHDIST_DEFAULT 0
155 #endif
156 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
157
158
159 #endif /* _LINUX_BOOTMEM_H */