projects/linux·blob v2.6.39 · refs

167 lines · 5.0 KiB

1#ifndef _LINUX_MEMBLOCK_H
2#define _LINUX_MEMBLOCK_H
3#ifdef __KERNEL__
4
5#ifdef CONFIG_HAVE_MEMBLOCK
6/*
7 * Logical memory blocks.
8 *
9 * Copyright (C) 2001 Peter Bergner, IBM Corp.
10 *
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.
15 */
16
17#include <linux/init.h>
18#include <linux/mm.h>
19
20#include <asm/memblock.h>
21
22#define INIT_MEMBLOCK_REGIONS 128
23#define MEMBLOCK_ERROR 0
24
25struct memblock_region {
26 phys_addr_t base;
27 phys_addr_t size;
28};
29
30struct memblock_type {
31 unsigned long cnt; /* number of regions */
32 unsigned long max; /* size of the allocated array */
33 struct memblock_region *regions;
34};
35
36struct memblock {
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;
41};
42
43extern struct memblock memblock;
44extern int memblock_debug;
45extern int memblock_can_resize;
46
47#define memblock_dbg(fmt, ...) \
48 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
49
50u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 align);
51int memblock_free_reserved_regions(void);
52int memblock_reserve_reserved_regions(void);
53
54extern void memblock_init(void);
55extern void memblock_analyze(void);
56extern long memblock_add(phys_addr_t base, phys_addr_t size);
57extern long memblock_remove(phys_addr_t base, phys_addr_t size);
58extern long memblock_free(phys_addr_t base, phys_addr_t size);
59extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
60
61/* The numa aware allocator is only available if
62 * CONFIG_ARCH_POPULATES_NODE_MAP is set
63 */
64extern phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
65 int nid);
66extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
67 int nid);
68
69extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
70
71/* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
72#define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
73#define MEMBLOCK_ALLOC_ACCESSIBLE 0
74
75extern phys_addr_t memblock_alloc_base(phys_addr_t size,
76 phys_addr_t align,
77 phys_addr_t max_addr);
78extern phys_addr_t __memblock_alloc_base(phys_addr_t size,
79 phys_addr_t align,
80 phys_addr_t max_addr);
81extern phys_addr_t memblock_phys_mem_size(void);
82extern phys_addr_t memblock_end_of_DRAM(void);
83extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
84extern int memblock_is_memory(phys_addr_t addr);
85extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
86extern int memblock_is_reserved(phys_addr_t addr);
87extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
88
89extern void memblock_dump_all(void);
90
91/* Provided by the architecture */
92extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
93extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
94 phys_addr_t addr2, phys_addr_t size2);
95
96/**
97 * memblock_set_current_limit - Set the current allocation limit to allow
98 * limiting allocations to what is currently
99 * accessible during boot
100 * @limit: New limit value (physical address)
101 */
102extern void memblock_set_current_limit(phys_addr_t limit);
103
104
105/*
106 * pfn conversion functions
107 *
108 * While the memory MEMBLOCKs should always be page aligned, the reserved
109 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
110 * idea of what they return for such non aligned MEMBLOCKs.
111 */
112
113/**
114 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
115 * @reg: memblock_region structure
116 */
117static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
118{
119 return PFN_UP(reg->base);
120}
121
122/**
123 * memblock_region_memory_end_pfn - Return the end_pfn this region
124 * @reg: memblock_region structure
125 */
126static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
127{
128 return PFN_DOWN(reg->base + reg->size);
129}
130
131/**
132 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
133 * @reg: memblock_region structure
134 */
135static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
136{
137 return PFN_DOWN(reg->base);
138}
139
140/**
141 * memblock_region_reserved_end_pfn - Return the end_pfn this region
142 * @reg: memblock_region structure
143 */
144static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
145{
146 return PFN_UP(reg->base + reg->size);
147}
148
149#define for_each_memblock(memblock_type, region) \
150 for (region = memblock.memblock_type.regions; \
151 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
152 region++)
153
154
155#ifdef ARCH_DISCARD_MEMBLOCK
156#define __init_memblock __init
157#define __initdata_memblock __initdata
158#else
159#define __init_memblock
160#define __initdata_memblock
161#endif
162
163#endif /* CONFIG_HAVE_MEMBLOCK */
164
165#endif /* __KERNEL__ */
166
167#endif /* _LINUX_MEMBLOCK_H */