1 #ifndef _LINUX_MEMBLOCK_H
2 #define _LINUX_MEMBLOCK_H
5 #ifdef CONFIG_HAVE_MEMBLOCK
7 * Logical memory blocks.
9 * Copyright (C) 2001 Peter Bergner, IBM Corp.
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
17 #include <linux/init.h>
20 #define INIT_MEMBLOCK_REGIONS 128
22 struct memblock_region {
26 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
31 struct memblock_type {
32 unsigned long cnt; /* number of regions */
33 unsigned long max; /* size of the allocated array */
34 phys_addr_t total_size; /* size of all regions */
35 struct memblock_region *regions;
39 bool bottom_up; /* is bottom up direction? */
40 phys_addr_t current_limit;
41 struct memblock_type memory;
42 struct memblock_type reserved;
45 extern struct memblock memblock;
46 extern int memblock_debug;
48 #define memblock_dbg(fmt, ...) \
49 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
51 phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
52 phys_addr_t size, phys_addr_t align, int nid);
53 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
54 phys_addr_t size, phys_addr_t align);
55 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
56 void memblock_allow_resize(void);
57 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
58 int memblock_add(phys_addr_t base, phys_addr_t size);
59 int memblock_remove(phys_addr_t base, phys_addr_t size);
60 int memblock_free(phys_addr_t base, phys_addr_t size);
61 int memblock_reserve(phys_addr_t base, phys_addr_t size);
62 void memblock_trim_memory(phys_addr_t align);
64 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
65 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
66 unsigned long *end_pfn);
67 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
68 unsigned long *out_end_pfn, int *out_nid);
71 * for_each_mem_pfn_range - early memory pfn range iterator
72 * @i: an integer used as loop variable
73 * @nid: node selector, %MAX_NUMNODES for all nodes
74 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
75 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
76 * @p_nid: ptr to int for nid of the range, can be %NULL
78 * Walks over configured memory ranges.
80 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
81 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
82 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
83 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
85 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
86 phys_addr_t *out_end, int *out_nid);
89 * for_each_free_mem_range - iterate through free memblock areas
90 * @i: u64 used as loop variable
91 * @nid: node selector, %MAX_NUMNODES for all nodes
92 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
93 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
94 * @p_nid: ptr to int for nid of the range, can be %NULL
96 * Walks over free (memory && !reserved) areas of memblock. Available as
97 * soon as memblock is initialized.
99 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \
101 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \
102 i != (u64)ULLONG_MAX; \
103 __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
105 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
106 phys_addr_t *out_end, int *out_nid);
109 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
110 * @i: u64 used as loop variable
111 * @nid: node selector, %MAX_NUMNODES for all nodes
112 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
113 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
114 * @p_nid: ptr to int for nid of the range, can be %NULL
116 * Walks over free (memory && !reserved) areas of memblock in reverse
117 * order. Available as soon as memblock is initialized.
119 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \
120 for (i = (u64)ULLONG_MAX, \
121 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \
122 i != (u64)ULLONG_MAX; \
123 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
125 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
126 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
128 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
133 static inline int memblock_get_region_node(const struct memblock_region *r)
138 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
142 static inline int memblock_get_region_node(const struct memblock_region *r)
146 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
148 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
149 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
151 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
153 #ifdef CONFIG_MOVABLE_NODE
155 * Set the allocation direction to bottom-up or top-down.
157 static inline void memblock_set_bottom_up(bool enable)
159 memblock.bottom_up = enable;
163 * Check if the allocation direction is bottom-up or not.
164 * if this is true, that said, memblock will allocate memory
165 * in bottom-up direction.
167 static inline bool memblock_bottom_up(void)
169 return memblock.bottom_up;
172 static inline void memblock_set_bottom_up(bool enable) {}
173 static inline bool memblock_bottom_up(void) { return false; }
176 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
177 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
178 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
180 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
181 phys_addr_t max_addr);
182 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
183 phys_addr_t max_addr);
184 phys_addr_t memblock_phys_mem_size(void);
185 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
186 phys_addr_t memblock_start_of_DRAM(void);
187 phys_addr_t memblock_end_of_DRAM(void);
188 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
189 int memblock_is_memory(phys_addr_t addr);
190 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
191 int memblock_is_reserved(phys_addr_t addr);
192 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
194 extern void __memblock_dump_all(void);
196 static inline void memblock_dump_all(void)
199 __memblock_dump_all();
203 * memblock_set_current_limit - Set the current allocation limit to allow
204 * limiting allocations to what is currently
205 * accessible during boot
206 * @limit: New limit value (physical address)
208 void memblock_set_current_limit(phys_addr_t limit);
212 * pfn conversion functions
214 * While the memory MEMBLOCKs should always be page aligned, the reserved
215 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
216 * idea of what they return for such non aligned MEMBLOCKs.
220 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
221 * @reg: memblock_region structure
223 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
225 return PFN_UP(reg->base);
229 * memblock_region_memory_end_pfn - Return the end_pfn this region
230 * @reg: memblock_region structure
232 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
234 return PFN_DOWN(reg->base + reg->size);
238 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
239 * @reg: memblock_region structure
241 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
243 return PFN_DOWN(reg->base);
247 * memblock_region_reserved_end_pfn - Return the end_pfn this region
248 * @reg: memblock_region structure
250 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
252 return PFN_UP(reg->base + reg->size);
255 #define for_each_memblock(memblock_type, region) \
256 for (region = memblock.memblock_type.regions; \
257 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
261 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
262 #define __init_memblock __meminit
263 #define __initdata_memblock __meminitdata
265 #define __init_memblock
266 #define __initdata_memblock
270 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
275 #endif /* CONFIG_HAVE_MEMBLOCK */
277 #endif /* __KERNEL__ */
279 #endif /* _LINUX_MEMBLOCK_H */