1 #ifndef _LINUX_MEMBLOCK_H
2 #define _LINUX_MEMBLOCK_H
5 #define MEMBLOCK_ERROR 0
7 #ifdef CONFIG_HAVE_MEMBLOCK
9 * Logical memory blocks.
11 * Copyright (C) 2001 Peter Bergner, IBM Corp.
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
19 #include <linux/init.h>
22 #include <asm/memblock.h>
24 #define INIT_MEMBLOCK_REGIONS 128
26 struct memblock_region {
31 struct memblock_type {
32 unsigned long cnt; /* number of regions */
33 unsigned long max; /* size of the allocated array */
34 struct memblock_region *regions;
38 phys_addr_t current_limit;
39 phys_addr_t memory_size; /* Updated by memblock_analyze() */
40 struct memblock_type memory;
41 struct memblock_type reserved;
44 extern struct memblock memblock;
45 extern int memblock_debug;
46 extern int memblock_can_resize;
48 #define memblock_dbg(fmt, ...) \
49 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
51 u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 align);
52 int memblock_free_reserved_regions(void);
53 int memblock_reserve_reserved_regions(void);
55 extern void memblock_init(void);
56 extern void memblock_analyze(void);
57 extern long memblock_add(phys_addr_t base, phys_addr_t size);
58 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
59 extern long memblock_free(phys_addr_t base, phys_addr_t size);
60 extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
62 /* The numa aware allocator is only available if
63 * CONFIG_ARCH_POPULATES_NODE_MAP is set
65 extern phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
67 extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
70 extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
72 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
73 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
74 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
76 extern phys_addr_t memblock_alloc_base(phys_addr_t size,
78 phys_addr_t max_addr);
79 extern phys_addr_t __memblock_alloc_base(phys_addr_t size,
81 phys_addr_t max_addr);
82 extern phys_addr_t memblock_phys_mem_size(void);
83 extern phys_addr_t memblock_end_of_DRAM(void);
84 extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
85 extern int memblock_is_memory(phys_addr_t addr);
86 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
87 extern int memblock_is_reserved(phys_addr_t addr);
88 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
90 extern void memblock_dump_all(void);
92 /* Provided by the architecture */
93 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
94 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
95 phys_addr_t addr2, phys_addr_t size2);
98 * memblock_set_current_limit - Set the current allocation limit to allow
99 * limiting allocations to what is currently
100 * accessible during boot
101 * @limit: New limit value (physical address)
103 extern void memblock_set_current_limit(phys_addr_t limit);
107 * pfn conversion functions
109 * While the memory MEMBLOCKs should always be page aligned, the reserved
110 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
111 * idea of what they return for such non aligned MEMBLOCKs.
115 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
116 * @reg: memblock_region structure
118 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
120 return PFN_UP(reg->base);
124 * memblock_region_memory_end_pfn - Return the end_pfn this region
125 * @reg: memblock_region structure
127 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
129 return PFN_DOWN(reg->base + reg->size);
133 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
134 * @reg: memblock_region structure
136 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
138 return PFN_DOWN(reg->base);
142 * memblock_region_reserved_end_pfn - Return the end_pfn this region
143 * @reg: memblock_region structure
145 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
147 return PFN_UP(reg->base + reg->size);
150 #define for_each_memblock(memblock_type, region) \
151 for (region = memblock.memblock_type.regions; \
152 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
156 #ifdef ARCH_DISCARD_MEMBLOCK
157 #define __init_memblock __init
158 #define __initdata_memblock __initdata
160 #define __init_memblock
161 #define __initdata_memblock
165 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
167 return MEMBLOCK_ERROR;
170 #endif /* CONFIG_HAVE_MEMBLOCK */
172 #endif /* __KERNEL__ */
174 #endif /* _LINUX_MEMBLOCK_H */