2 * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
4 #ifndef _LINUX_BOOTMEM_H
5 #define _LINUX_BOOTMEM_H
7 #include <linux/mmzone.h>
11 * simple boot-time physical memory area allocator.
14 extern unsigned long max_low_pfn
;
15 extern unsigned long min_low_pfn
;
20 extern unsigned long max_pfn
;
22 #ifndef CONFIG_NO_BOOTMEM
24 * node_bootmem_map is a map pointer - the bits represent all physical
25 * memory pages (including holes) on the node.
27 typedef struct bootmem_data
{
28 unsigned long node_min_pfn
;
29 unsigned long node_low_pfn
;
30 void *node_bootmem_map
;
31 unsigned long last_end_off
;
32 unsigned long hint_idx
;
33 struct list_head list
;
36 extern bootmem_data_t bootmem_node_data
[];
39 extern unsigned long bootmem_bootmap_pages(unsigned long);
41 extern unsigned long init_bootmem_node(pg_data_t
*pgdat
,
42 unsigned long freepfn
,
43 unsigned long startpfn
,
44 unsigned long endpfn
);
45 extern unsigned long init_bootmem(unsigned long addr
, unsigned long memend
);
47 extern unsigned long free_low_memory_core_early(int nodeid
);
48 extern unsigned long free_all_bootmem_node(pg_data_t
*pgdat
);
49 extern unsigned long free_all_bootmem(void);
51 extern void free_bootmem_node(pg_data_t
*pgdat
,
54 extern void free_bootmem(unsigned long physaddr
, unsigned long size
);
55 extern void free_bootmem_late(unsigned long physaddr
, unsigned long size
);
56 extern void __free_pages_bootmem(struct page
*page
, unsigned int order
);
59 * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
60 * the architecture-specific code should honor this).
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.
66 #define BOOTMEM_DEFAULT 0
67 #define BOOTMEM_EXCLUSIVE (1<<0)
69 extern int reserve_bootmem(unsigned long addr
,
72 extern int reserve_bootmem_node(pg_data_t
*pgdat
,
73 unsigned long physaddr
,
77 extern void *__alloc_bootmem(unsigned long size
,
80 extern void *__alloc_bootmem_nopanic(unsigned long size
,
83 extern void *__alloc_bootmem_node(pg_data_t
*pgdat
,
87 void *__alloc_bootmem_node_high(pg_data_t
*pgdat
,
91 extern void *__alloc_bootmem_node_nopanic(pg_data_t
*pgdat
,
95 void *___alloc_bootmem_node_nopanic(pg_data_t
*pgdat
,
100 extern void *__alloc_bootmem_low(unsigned long size
,
103 void *__alloc_bootmem_low_nopanic(unsigned long size
,
106 extern void *__alloc_bootmem_low_node(pg_data_t
*pgdat
,
111 #ifdef CONFIG_NO_BOOTMEM
112 /* We are using top down, so it is safe to use 0 here */
113 #define BOOTMEM_LOW_LIMIT 0
115 #define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
118 #define alloc_bootmem(x) \
119 __alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
120 #define alloc_bootmem_align(x, align) \
121 __alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
122 #define alloc_bootmem_nopanic(x) \
123 __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
124 #define alloc_bootmem_pages(x) \
125 __alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
126 #define alloc_bootmem_pages_nopanic(x) \
127 __alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
128 #define alloc_bootmem_node(pgdat, x) \
129 __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
130 #define alloc_bootmem_node_nopanic(pgdat, x) \
131 __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
132 #define alloc_bootmem_pages_node(pgdat, x) \
133 __alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
134 #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
135 __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
137 #define alloc_bootmem_low(x) \
138 __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
139 #define alloc_bootmem_low_pages_nopanic(x) \
140 __alloc_bootmem_low_nopanic(x, PAGE_SIZE, 0)
141 #define alloc_bootmem_low_pages(x) \
142 __alloc_bootmem_low(x, PAGE_SIZE, 0)
143 #define alloc_bootmem_low_pages_node(pgdat, x) \
144 __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
146 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
147 extern void *alloc_remap(int nid
, unsigned long size
);
149 static inline void *alloc_remap(int nid
, unsigned long size
)
153 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
155 extern void *alloc_large_system_hash(const char *tablename
,
156 unsigned long bucketsize
,
157 unsigned long numentries
,
160 unsigned int *_hash_shift
,
161 unsigned int *_hash_mask
,
162 unsigned long low_limit
,
163 unsigned long high_limit
);
165 #define HASH_EARLY 0x00000001 /* Allocating during early boot? */
166 #define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min
167 * shift passed via *_hash_shift */
169 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
170 * sufficient vmalloc space.
172 #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
173 #define HASHDIST_DEFAULT 1
175 #define HASHDIST_DEFAULT 0
177 extern int hashdist
; /* Distribute hashes across NUMA nodes? */
180 #endif /* _LINUX_BOOTMEM_H */