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 unsigned long free_all_bootmem(void);
88 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
89 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
90 unsigned long size,
91 unsigned long align,
92 unsigned long goal);
93 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
94 unsigned long freepfn,
95 unsigned long startpfn,
96 unsigned long endpfn);
97 extern void reserve_bootmem_node(pg_data_t *pgdat,
98 unsigned long physaddr,
99 unsigned long size,
100 int flags);
101 extern void free_bootmem_node(pg_data_t *pgdat,
102 unsigned long addr,
103 unsigned long size);
104
105 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
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_low_pages_node(pgdat, x) \
111 __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
112 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
113
114 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
115 extern void *alloc_remap(int nid, unsigned long size);
116 #else
117 static inline void *alloc_remap(int nid, unsigned long size)
118 {
119 return NULL;
120 }
121 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
122
123 extern unsigned long __meminitdata nr_kernel_pages;
124 extern unsigned long __meminitdata nr_all_pages;
125
126 extern void *alloc_large_system_hash(const char *tablename,
127 unsigned long bucketsize,
128 unsigned long numentries,
129 int scale,
130 int flags,
131 unsigned int *_hash_shift,
132 unsigned int *_hash_mask,
133 unsigned long limit);
134
135 #define HASH_EARLY 0x00000001 /* Allocating during early boot? */
136
137 /* Only NUMA needs hash distribution.
138 * IA64 and x86_64 have sufficient vmalloc space.
139 */
140 #if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
141 #define HASHDIST_DEFAULT 1
142 #else
143 #define HASHDIST_DEFAULT 0
144 #endif
145 extern int hashdist; /* Distribute hashes across NUMA nodes? */
146
147
148 #endif /* _LINUX_BOOTMEM_H */
149
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