a1d9b79078ea03425cb1ce4ae8746daf01c46fd5
[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_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 unsigned long bootmem_bootmap_pages(unsigned long);
42 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
43 extern void free_bootmem(unsigned long addr, unsigned long size);
44 extern void *__alloc_bootmem(unsigned long size,
45                              unsigned long align,
46                              unsigned long goal);
47 extern void *__alloc_bootmem_nopanic(unsigned long size,
48                                      unsigned long align,
49                                      unsigned long goal);
50 extern void *__alloc_bootmem_low(unsigned long size,
51                                  unsigned long align,
52                                  unsigned long goal);
53 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
54                                       unsigned long size,
55                                       unsigned long align,
56                                       unsigned long goal);
57 extern void *__alloc_bootmem_core(struct bootmem_data *bdata,
58                                   unsigned long size,
59                                   unsigned long align,
60                                   unsigned long goal,
61                                   unsigned long limit);
62
63 /*
64  * flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
65  * the architecture-specific code should honor this)
66  */
67 #define BOOTMEM_DEFAULT         0
68 #define BOOTMEM_EXCLUSIVE       (1<<0)
69
70 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
71 /*
72  * If flags is 0, then the return value is always 0 (success). If
73  * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
74  * memory already was reserved.
75  */
76 extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags);
77 #define alloc_bootmem(x) \
78         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
79 #define alloc_bootmem_low(x) \
80         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
81 #define alloc_bootmem_pages(x) \
82         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
83 #define alloc_bootmem_low_pages(x) \
84         __alloc_bootmem_low(x, PAGE_SIZE, 0)
85 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
86
87 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
88                                    int flags);
89 extern unsigned long free_all_bootmem(void);
90 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
91 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
92                                   unsigned long size,
93                                   unsigned long align,
94                                   unsigned long goal);
95 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
96                                        unsigned long freepfn,
97                                        unsigned long startpfn,
98                                        unsigned long endpfn);
99 extern int reserve_bootmem_node(pg_data_t *pgdat,
100                                  unsigned long physaddr,
101                                  unsigned long size,
102                                  int flags);
103 extern void free_bootmem_node(pg_data_t *pgdat,
104                               unsigned long addr,
105                               unsigned long size);
106 extern void *alloc_bootmem_section(unsigned long size,
107                                    unsigned long section_nr);
108
109 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
110 #define alloc_bootmem_node(pgdat, x) \
111         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
112 #define alloc_bootmem_pages_node(pgdat, x) \
113         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
114 #define alloc_bootmem_low_pages_node(pgdat, x) \
115         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
116 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
117
118 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
119 extern void *alloc_remap(int nid, unsigned long size);
120 #else
121 static inline void *alloc_remap(int nid, unsigned long size)
122 {
123         return NULL;
124 }
125 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
126
127 extern unsigned long __meminitdata nr_kernel_pages;
128 extern unsigned long __meminitdata nr_all_pages;
129
130 extern void *alloc_large_system_hash(const char *tablename,
131                                      unsigned long bucketsize,
132                                      unsigned long numentries,
133                                      int scale,
134                                      int flags,
135                                      unsigned int *_hash_shift,
136                                      unsigned int *_hash_mask,
137                                      unsigned long limit);
138
139 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
140
141 /* Only NUMA needs hash distribution.
142  * IA64 and x86_64 have sufficient vmalloc space.
143  */
144 #if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
145 #define HASHDIST_DEFAULT 1
146 #else
147 #define HASHDIST_DEFAULT 0
148 #endif
149 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
150
151
152 #endif /* _LINUX_BOOTMEM_H */