Linux kernel mirror (for testing)
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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#define INIT_MEMBLOCK_REGIONS 128
21
22struct memblock_region {
23 phys_addr_t base;
24 phys_addr_t size;
25#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
26 int nid;
27#endif
28};
29
30struct memblock_type {
31 unsigned long cnt; /* number of regions */
32 unsigned long max; /* size of the allocated array */
33 phys_addr_t total_size; /* size of all regions */
34 struct memblock_region *regions;
35};
36
37struct memblock {
38 phys_addr_t current_limit;
39 struct memblock_type memory;
40 struct memblock_type reserved;
41};
42
43extern struct memblock memblock;
44extern int memblock_debug;
45
46#define memblock_dbg(fmt, ...) \
47 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
48
49phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
50 phys_addr_t size, phys_addr_t align, int nid);
51phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
52 phys_addr_t size, phys_addr_t align);
53phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
54void memblock_allow_resize(void);
55int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
56int memblock_add(phys_addr_t base, phys_addr_t size);
57int memblock_remove(phys_addr_t base, phys_addr_t size);
58int memblock_free(phys_addr_t base, phys_addr_t size);
59int memblock_reserve(phys_addr_t base, phys_addr_t size);
60
61#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
62void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
63 unsigned long *out_end_pfn, int *out_nid);
64
65/**
66 * for_each_mem_pfn_range - early memory pfn range iterator
67 * @i: an integer used as loop variable
68 * @nid: node selector, %MAX_NUMNODES for all nodes
69 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
70 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
71 * @p_nid: ptr to int for nid of the range, can be %NULL
72 *
73 * Walks over configured memory ranges.
74 */
75#define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
76 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
77 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
78#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
79
80void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
81 phys_addr_t *out_end, int *out_nid);
82
83/**
84 * for_each_free_mem_range - iterate through free memblock areas
85 * @i: u64 used as loop variable
86 * @nid: node selector, %MAX_NUMNODES for all nodes
87 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
88 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
89 * @p_nid: ptr to int for nid of the range, can be %NULL
90 *
91 * Walks over free (memory && !reserved) areas of memblock. Available as
92 * soon as memblock is initialized.
93 */
94#define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \
95 for (i = 0, \
96 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \
97 i != (u64)ULLONG_MAX; \
98 __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
99
100void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
101 phys_addr_t *out_end, int *out_nid);
102
103/**
104 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
105 * @i: u64 used as loop variable
106 * @nid: node selector, %MAX_NUMNODES for all nodes
107 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
108 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
109 * @p_nid: ptr to int for nid of the range, can be %NULL
110 *
111 * Walks over free (memory && !reserved) areas of memblock in reverse
112 * order. Available as soon as memblock is initialized.
113 */
114#define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \
115 for (i = (u64)ULLONG_MAX, \
116 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \
117 i != (u64)ULLONG_MAX; \
118 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
119
120#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
121int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
122
123static inline void memblock_set_region_node(struct memblock_region *r, int nid)
124{
125 r->nid = nid;
126}
127
128static inline int memblock_get_region_node(const struct memblock_region *r)
129{
130 return r->nid;
131}
132#else
133static inline void memblock_set_region_node(struct memblock_region *r, int nid)
134{
135}
136
137static inline int memblock_get_region_node(const struct memblock_region *r)
138{
139 return 0;
140}
141#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
142
143phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
144phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
145
146phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
147
148/* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
149#define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
150#define MEMBLOCK_ALLOC_ACCESSIBLE 0
151
152phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
153 phys_addr_t max_addr);
154phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
155 phys_addr_t max_addr);
156phys_addr_t memblock_phys_mem_size(void);
157phys_addr_t memblock_start_of_DRAM(void);
158phys_addr_t memblock_end_of_DRAM(void);
159void memblock_enforce_memory_limit(phys_addr_t memory_limit);
160int memblock_is_memory(phys_addr_t addr);
161int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
162int memblock_is_reserved(phys_addr_t addr);
163int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
164
165extern void __memblock_dump_all(void);
166
167static inline void memblock_dump_all(void)
168{
169 if (memblock_debug)
170 __memblock_dump_all();
171}
172
173/**
174 * memblock_set_current_limit - Set the current allocation limit to allow
175 * limiting allocations to what is currently
176 * accessible during boot
177 * @limit: New limit value (physical address)
178 */
179void memblock_set_current_limit(phys_addr_t limit);
180
181
182/*
183 * pfn conversion functions
184 *
185 * While the memory MEMBLOCKs should always be page aligned, the reserved
186 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
187 * idea of what they return for such non aligned MEMBLOCKs.
188 */
189
190/**
191 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
192 * @reg: memblock_region structure
193 */
194static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
195{
196 return PFN_UP(reg->base);
197}
198
199/**
200 * memblock_region_memory_end_pfn - Return the end_pfn this region
201 * @reg: memblock_region structure
202 */
203static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
204{
205 return PFN_DOWN(reg->base + reg->size);
206}
207
208/**
209 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
210 * @reg: memblock_region structure
211 */
212static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
213{
214 return PFN_DOWN(reg->base);
215}
216
217/**
218 * memblock_region_reserved_end_pfn - Return the end_pfn this region
219 * @reg: memblock_region structure
220 */
221static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
222{
223 return PFN_UP(reg->base + reg->size);
224}
225
226#define for_each_memblock(memblock_type, region) \
227 for (region = memblock.memblock_type.regions; \
228 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
229 region++)
230
231
232#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
233#define __init_memblock __meminit
234#define __initdata_memblock __meminitdata
235#else
236#define __init_memblock
237#define __initdata_memblock
238#endif
239
240#else
241static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
242{
243 return 0;
244}
245
246#endif /* CONFIG_HAVE_MEMBLOCK */
247
248#endif /* __KERNEL__ */
249
250#endif /* _LINUX_MEMBLOCK_H */