Linux kernel mirror (for testing)
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linux
1#ifndef _LINUX_MEMBLOCK_H
2#define _LINUX_MEMBLOCK_H
3#ifdef __KERNEL__
4
5#define MEMBLOCK_ERROR 0
6
7#ifdef CONFIG_HAVE_MEMBLOCK
8/*
9 * Logical memory blocks.
10 *
11 * Copyright (C) 2001 Peter Bergner, IBM Corp.
12 *
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.
17 */
18
19#include <linux/init.h>
20#include <linux/mm.h>
21
22#include <asm/memblock.h>
23
24#define INIT_MEMBLOCK_REGIONS 128
25
26struct memblock_region {
27 phys_addr_t base;
28 phys_addr_t size;
29};
30
31struct memblock_type {
32 unsigned long cnt; /* number of regions */
33 unsigned long max; /* size of the allocated array */
34 struct memblock_region *regions;
35};
36
37struct memblock {
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;
42};
43
44extern struct memblock memblock;
45extern int memblock_debug;
46extern int memblock_can_resize;
47
48#define memblock_dbg(fmt, ...) \
49 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
50
51u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 align);
52int memblock_free_reserved_regions(void);
53int memblock_reserve_reserved_regions(void);
54
55extern void memblock_init(void);
56extern void memblock_analyze(void);
57extern long memblock_add(phys_addr_t base, phys_addr_t size);
58extern long memblock_remove(phys_addr_t base, phys_addr_t size);
59extern long memblock_free(phys_addr_t base, phys_addr_t size);
60extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
61
62/* The numa aware allocator is only available if
63 * CONFIG_ARCH_POPULATES_NODE_MAP is set
64 */
65extern phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
66 int nid);
67extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
68 int nid);
69
70extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
71
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
75
76extern phys_addr_t memblock_alloc_base(phys_addr_t size,
77 phys_addr_t align,
78 phys_addr_t max_addr);
79extern phys_addr_t __memblock_alloc_base(phys_addr_t size,
80 phys_addr_t align,
81 phys_addr_t max_addr);
82extern phys_addr_t memblock_phys_mem_size(void);
83extern phys_addr_t memblock_end_of_DRAM(void);
84extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
85extern int memblock_is_memory(phys_addr_t addr);
86extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
87extern int memblock_is_reserved(phys_addr_t addr);
88extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
89
90extern void memblock_dump_all(void);
91
92/* Provided by the architecture */
93extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
94extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
95 phys_addr_t addr2, phys_addr_t size2);
96
97/**
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)
102 */
103extern void memblock_set_current_limit(phys_addr_t limit);
104
105
106/*
107 * pfn conversion functions
108 *
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.
112 */
113
114/**
115 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
116 * @reg: memblock_region structure
117 */
118static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
119{
120 return PFN_UP(reg->base);
121}
122
123/**
124 * memblock_region_memory_end_pfn - Return the end_pfn this region
125 * @reg: memblock_region structure
126 */
127static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
128{
129 return PFN_DOWN(reg->base + reg->size);
130}
131
132/**
133 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
134 * @reg: memblock_region structure
135 */
136static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
137{
138 return PFN_DOWN(reg->base);
139}
140
141/**
142 * memblock_region_reserved_end_pfn - Return the end_pfn this region
143 * @reg: memblock_region structure
144 */
145static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
146{
147 return PFN_UP(reg->base + reg->size);
148}
149
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); \
153 region++)
154
155
156#ifdef ARCH_DISCARD_MEMBLOCK
157#define __init_memblock __init
158#define __initdata_memblock __initdata
159#else
160#define __init_memblock
161#define __initdata_memblock
162#endif
163
164#else
165static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
166{
167 return MEMBLOCK_ERROR;
168}
169
170#endif /* CONFIG_HAVE_MEMBLOCK */
171
172#endif /* __KERNEL__ */
173
174#endif /* _LINUX_MEMBLOCK_H */