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 #include <asm/memblock.h>
22 #define INIT_MEMBLOCK_REGIONS 128
23 #define MEMBLOCK_ERROR 0
25 struct memblock_region {
30 struct memblock_type {
31 unsigned long cnt; /* number of regions */
32 unsigned long max; /* size of the allocated array */
33 struct memblock_region *regions;
37 phys_addr_t current_limit;
38 phys_addr_t memory_size; /* Updated by memblock_analyze() */
39 struct memblock_type memory;
40 struct memblock_type reserved;
43 extern struct memblock memblock;
44 extern int memblock_debug;
45 extern int memblock_can_resize;
47 #define memblock_dbg(fmt, ...) \
48 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
50 extern void __init memblock_init(void);
51 extern void __init memblock_analyze(void);
52 extern long memblock_add(phys_addr_t base, phys_addr_t size);
53 extern long memblock_remove(phys_addr_t base, phys_addr_t size);
54 extern long __init memblock_free(phys_addr_t base, phys_addr_t size);
55 extern long __init memblock_reserve(phys_addr_t base, phys_addr_t size);
57 /* The numa aware allocator is only available if
58 * CONFIG_ARCH_POPULATES_NODE_MAP is set
60 extern phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
62 extern phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
65 extern phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align);
67 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
68 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
69 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
71 extern phys_addr_t __init memblock_alloc_base(phys_addr_t size,
73 phys_addr_t max_addr);
74 extern phys_addr_t __init __memblock_alloc_base(phys_addr_t size,
76 phys_addr_t max_addr);
77 extern phys_addr_t __init memblock_phys_mem_size(void);
78 extern phys_addr_t memblock_end_of_DRAM(void);
79 extern void __init memblock_enforce_memory_limit(phys_addr_t memory_limit);
80 extern int memblock_is_memory(phys_addr_t addr);
81 extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
82 extern int __init memblock_is_reserved(phys_addr_t addr);
83 extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
85 extern void memblock_dump_all(void);
87 /* Provided by the architecture */
88 extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
89 extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
90 phys_addr_t addr2, phys_addr_t size2);
93 * memblock_set_current_limit - Set the current allocation limit to allow
94 * limiting allocations to what is currently
95 * accessible during boot
96 * @limit: New limit value (physical address)
98 extern void memblock_set_current_limit(phys_addr_t limit);
102 * pfn conversion functions
104 * While the memory MEMBLOCKs should always be page aligned, the reserved
105 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
106 * idea of what they return for such non aligned MEMBLOCKs.
110 * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
111 * @reg: memblock_region structure
113 static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
115 return reg->base >> PAGE_SHIFT;
119 * memblock_region_last_pfn - Return the highest pfn intersecting with the region
120 * @reg: memblock_region structure
122 static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
124 return (reg->base + reg->size - 1) >> PAGE_SHIFT;
128 * memblock_region_end_pfn - Return the pfn of the first page following the region
129 * but not intersecting it
130 * @reg: memblock_region structure
132 static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
134 return memblock_region_last_pfn(reg) + 1;
138 * memblock_region_pages - Return the number of pages covering a region
139 * @reg: memblock_region structure
141 static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
143 return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
146 #define for_each_memblock(memblock_type, region) \
147 for (region = memblock.memblock_type.regions; \
148 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
152 #ifdef ARCH_DISCARD_MEMBLOCK
153 #define __init_memblock __init
154 #define __initdata_memblock __initdata
156 #define __init_memblock
157 #define __initdata_memblock
160 #endif /* CONFIG_HAVE_MEMBLOCK */
162 #endif /* __KERNEL__ */
164 #endif /* _LINUX_MEMBLOCK_H */