summaryrefslogtreecommitdiffstats
path: root/include/linux/memblock.h
blob: cbf46f56d1053b68cc1e9f4aa9d9c48cb46a982d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _LINUX_MEMBLOCK_H
#define _LINUX_MEMBLOCK_H
#ifdef __KERNEL__

/*
 * Logical memory blocks.
 *
 * Copyright (C) 2001 Peter Bergner, IBM Corp.
 */

#include <linux/init.h>
#include <linux/mm.h>
#include <asm/dma.h>

extern unsigned long max_low_pfn;
extern unsigned long min_low_pfn;

/*
 * highest page
 */
extern unsigned long max_pfn;
/*
 * highest possible page
 */
extern unsigned long long max_possible_pfn;

/**
 * enum memblock_flags - definition of memory region attributes
 * @MEMBLOCK_NONE: no special request
 * @MEMBLOCK_HOTPLUG: hotpluggable region
 * @MEMBLOCK_MIRROR: mirrored region
 * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as
 * reserved in the memory map; refer to memblock_mark_nomap() description
 * for further details
 */
enum memblock_flags {
	MEMBLOCK_NONE		= 0x0,	/* No special request */
	MEMBLOCK_HOTPLUG	= 0x1,	/* hotpluggable region */
	MEMBLOCK_MIRROR		= 0x2,	/* mirrored region */
	MEMBLOCK_NOMAP		= 0x4,	/* don't add to kernel direct mapping */
};

/**
 * struct memblock_region - represents a memory region
 * @base: base address of the region
 * @size: size of the region
 * @flags: memory region attributes
 * @nid: NUMA node id
 */
struct memblock_region {
	phys_addr_t base;
	phys_addr_t size;
	enum memblock_flags flags;
#ifdef CONFIG_NUMA
	int nid;
#endif
};

/**
 * struct memblock_type - collection of memory regions of certain type
 * @cnt: number of regions
 * @max: size of the allocated array
 * @total_size: size of all regions
 * @regions: array of regions
 * @name: the memory type symbolic name
 */
struct memblock_type {
	unsigned long cnt;
	unsigned long max;
	phys_addr_t total_size;
	struct memblock_region *regions;
	char *name;
};

/**
 * struct memblock - memblock allocator metadata
 * @bottom_up: is bottom up direction?
 * @current_limit: physical address of the current allocation limit
 * @memory: usable memory regions
 * @reserved: reserved memory regions
 */
struct memblock {
	bool bottom_up;  /* is bottom up direction? */
	phys_addr_t current_limit;
	struct memblock_type memory;
	struct memblock_type reserved;
};

extern struct memblock memblock;

#ifndef CONFIG_ARCH_KEEP_MEMBLOCK
#define __init_memblock __meminit
#define __initdata_memblock __meminitdata
void memblock_discard(void);
#else
#define __init_memblock
#define __initdata_memblock
static inline void memblock_discard(void) {}
#endif

phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
				   phys_addr_t size, phys_addr_t align);
void memblock_allow_resize(void);
int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
int memblock_add(phys_addr_t base, phys_addr_t size);
int memblock_remove(phys_addr_t base, phys_addr_t size);
int memblock_free(phys_addr_t base, phys_addr_t size);
int memblock_reserve(phys_addr_t base, phys_addr_t size);
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
#endif
void memblock_trim_memory(phys_addr_t align);
bool memblock_overlaps_region(struct memblock_type *type,
			      phys_addr_t base, phys_addr_t size);
int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);

void memblock_free_all(void);
void reset_node_managed_pages(pg_data_t *pgdat);
void reset_all_zones_managed_pages(void);

/* Low level functions */
void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
		      struct memblock_type *type_a,
		      struct memblock_type *type_b, phys_addr_t *out_start,
		      phys_addr_t *out_end, int *out_nid);

void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags,
			  struct memblock_type *type_a,
			  struct memblock_type *type_b, phys_addr_t *out_start,
			  phys_addr_t *out_end, int *out_nid);

void __memblock_free_late(phys_addr_t base, phys_addr_t size);

#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
static inline void __next_physmem_range(u64 *idx, struct memblock_type *type,
					phys_addr_t *out_start,
					phys_addr_t *out_end)
{
	extern struct memblock_type physmem;

	__next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type,
			 out_start, out_end, NULL);
}

/**
 * for_each_physmem_range - iterate through physmem areas not included in type.
 * @i: u64 used as loop variable
 * @type: ptr to memblock_type which excludes from the iteration, can be %NULL
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 */
#define for_each_physmem_range(i, type, p_start, p_end)			\
	for (i = 0, __next_physmem_range(&i, type, p_start, p_end);	\
	     i != (u64)ULLONG_MAX;					\
	     __next_physmem_range(&i, type, p_start, p_end))
#endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */

/**
 * __for_each_mem_range - iterate through memblock areas from type_a and not
 * included in type_b. Or just type_a if type_b is NULL.
 * @i: u64 used as loop variable
 * @type_a: ptr to memblock_type to iterate
 * @type_b: ptr to memblock_type which excludes from the iteration
 * @nid: node selector, %NUMA_NO_NODE for all nodes
 * @flags: pick from blocks based on memory attributes
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 * @p_nid: ptr to int for nid of the range, can be %NULL
 */
#define __for_each_mem_range(i, type_a, type_b, nid, flags,		\
			   p_start, p_end, p_nid)			\
	for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,	\
				     p_start, p_end, p_nid);		\
	     i != (u64)ULLONG_MAX;					\
	     __next_mem_range(&i, nid, flags, type_a, type_b,		\
			      p_start, p_end, p_nid))

/**
 * __for_each_mem_range_rev - reverse iterate through memblock areas from
 * type_a and not included in type_b. Or just type_a if type_b is NULL.
 * @i: u64 used as loop variable
 * @type_a: ptr to memblock_type to iterate
 * @type_b: ptr to memblock_type which excludes from the iteration
 * @nid: node selector, %NUMA_NO_NODE for all nodes
 * @flags: pick from blocks based on memory attributes
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 * @p_nid: ptr to int for nid of the range, can be %NULL
 */
#define __for_each_mem_range_rev(i, type_a, type_b, nid, flags,		\
				 p_start, p_end, p_nid)			\
	for (i = (u64)ULLONG_MAX,					\
		     __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
					  p_start, p_end, p_nid);	\
	     i != (u64)ULLONG_MAX;					\
	     __next_mem_range_rev(&i, nid, flags, type_a, type_b,	\
				  p_start, p_end, p_nid))

/**
 * for_each_mem_range - iterate through memory areas.
 * @i: u64 used as loop variable
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 */
#define for_each_mem_range(i, p_start, p_end) \
	__for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE,	\
			     MEMBLOCK_NONE, p_start, p_end, NULL)

/**
 * for_each_mem_range_rev - reverse iterate through memblock areas from
 * type_a and not included in type_b. Or just type_a if type_b is NULL.
 * @i: u64 used as loop variable
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 */
#define for_each_mem_range_rev(i, p_start, p_end)			\
	__for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \
				 MEMBLOCK_NONE, p_start, p_end, NULL)

/**
 * for_each_reserved_mem_range - iterate over all reserved memblock areas
 * @i: u64 used as loop variable
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 *
 * Walks over reserved areas of memblock. Available as soon as memblock
 * is initialized.
 */
#define for_each_reserved_mem_range(i, p_start, p_end)			\
	__for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE,	\
			     MEMBLOCK_NONE, p_start, p_end, NULL)

static inline bool memblock_is_hotpluggable(struct memblock_region *m)
{
	return m->flags & MEMBLOCK_HOTPLUG;
}

static inline bool memblock_is_mirror(struct memblock_region *m)
{
	return m->flags & MEMBLOCK_MIRROR;
}

static inline bool memblock_is_nomap(struct memblock_region *m)
{
	return m->flags & MEMBLOCK_NOMAP;
}

int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
			    unsigned long  *end_pfn);
void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
			  unsigned long *out_end_pfn, int *out_nid);

/**
 * for_each_mem_pfn_range - early memory pfn range iterator
 * @i: an integer used as loop variable
 * @nid: node selector, %MAX_NUMNODES for all nodes
 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
 * @p_nid: ptr to int for nid of the range, can be %NULL
 *
 * Walks over configured memory ranges.
 */
#define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)		\
	for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
	     i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))

#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
				  unsigned long *out_spfn,
				  unsigned long *out_epfn);
/**
 * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free
 * memblock areas
 * @i: u64 used as loop variable
 * @zone: zone in which all of the memory blocks reside
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 *
 * Walks over free (memory && !reserved) areas of memblock in a specific
 * zone. Available once memblock and an empty zone is initialized. The main
 * assumption is that the zone start, end, and pgdat have been associated.
 * This way we can use the zone to determine NUMA node, and if a given part
 * of the memblock is valid for the zone.
 */
#define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end)	\
	for (i = 0,							\
	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end);	\
	     i != U64_MAX;					\
	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))

/**
 * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
 * free memblock areas from a given point
 * @i: u64 used as loop variable
 * @zone: zone in which all of the memory blocks reside
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 *
 * Walks over free (memory && !reserved) areas of memblock in a specific
 * zone, continuing from current position. Available as soon as memblock is
 * initialized.
 */
#define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
	for (; i != U64_MAX;					  \
	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))

int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask);

#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */

/**
 * for_each_free_mem_range - iterate through free memblock areas
 * @i: u64 used as loop variable
 * @nid: node selector, %NUMA_NO_NODE for all nodes
 * @flags: pick from blocks based on memory attributes
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 * @p_nid: ptr to int for nid of the range, can be %NULL
 *
 * Walks over free (memory && !reserved) areas of memblock.  Available as
 * soon as memblock is initialized.
 */
#define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)	\
	__for_each_mem_range(i, &memblock.memory, &memblock.reserved,	\
			     nid, flags, p_start, p_end, p_nid)

/**
 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
 * @i: u64 used as loop variable
 * @nid: node selector, %NUMA_NO_NODE for all nodes
 * @flags: pick from blocks based on memory attributes
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 * @p_nid: ptr to int for nid of the range, can be %NULL
 *
 * Walks over free (memory && !reserved) areas of memblock in reverse
 * order.  Available as soon as memblock is initialized.
 */
#define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,	\
					p_nid)				\
	__for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
				 nid, flags, p_start, p_end, p_nid)

int memblock_set_node(phys_addr_t base, phys_addr_t size,
		      struct memblock_type *type, int nid);

#ifdef CONFIG_NUMA
static inline void memblock_set_region_node(struct memblock_region *r, int nid)
{
	r->nid = nid;
}

static inline int memblock_get_region_node(const struct memblock_region *r)
{
	return r->nid;
}
#else
static inline void memblock_set_region_node(struct memblock_region *r, int nid)
{
}

static inline int memblock_get_region_node(const struct memblock_region *r)
{
	return 0;
}
#endif /* CONFIG_NUMA */

/* Flags for memblock allocation APIs */
#define MEMBLOCK_ALLOC_ANYWHERE	(~(phys_addr_t)0)
#define MEMBLOCK_ALLOC_ACCESSIBLE	0
#define MEMBLOCK_ALLOC_KASAN		1

/* We are using top down, so it is safe to use 0 here */
#define MEMBLOCK_LOW_LIMIT 0

#ifndef ARCH_LOW_ADDRESS_LIMIT
#define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
#endif

phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
				      phys_addr_t start, phys_addr_t end);
phys_addr_t memblock_alloc_range_nid(phys_addr_t size,
				      phys_addr_t align, phys_addr_t start,
				      phys_addr_t end, int nid, bool exact_nid);
phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);

static inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
					      phys_addr_t align)
{
	return memblock_phys_alloc_range(size, align, 0,
					 MEMBLOCK_ALLOC_ACCESSIBLE);
}

void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align,
				 phys_addr_t min_addr, phys_addr_t max_addr,
				 int nid);
void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
				 phys_addr_t min_addr, phys_addr_t max_addr,
				 int nid);
void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
			     phys_addr_t min_addr, phys_addr_t max_addr,
			     int nid);

static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align)
{
	return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
				      MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
}

static inline void *memblock_alloc_raw(phys_addr_t size,
					       phys_addr_t align)
{
	return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT,
					  MEMBLOCK_ALLOC_ACCESSIBLE,
					  NUMA_NO_NODE);
}

static inline void *memblock_alloc_from(phys_addr_t size,
						phys_addr_t align,
						phys_addr_t min_addr)
{
	return memblock_alloc_try_nid(size, align, min_addr,
				      MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
}

static inline void *memblock_alloc_low(phys_addr_t size,
					       phys_addr_t align)
{
	return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
				      ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE);
}

static inline void *memblock_alloc_node(phys_addr_t size,
						phys_addr_t align, int nid)
{
	return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
				      MEMBLOCK_ALLOC_ACCESSIBLE, nid);
}

static inline void memblock_free_early(phys_addr_t base,
					      phys_addr_t size)
{
	memblock_free(base, size);
}

static inline void memblock_free_early_nid(phys_addr_t base,
						  phys_addr_t size, int nid)
{
	memblock_free(base, size);
}

static inline void memblock_free_late(phys_addr_t base, phys_addr_t size)
{
	__memblock_free_late(base, size);
}

/*
 * Set the allocation direction to bottom-up or top-down.
 */
static inline __init_memblock void memblock_set_bottom_up(bool enable)
{
	memblock.bottom_up = enable;
}

/*
 * Check if the allocation direction is bottom-up or not.
 * if this is true, that said, memblock will allocate memory
 * in bottom-up direction.
 */
static inline __init_memblock bool memblock_bottom_up(void)
{
	return memblock.bottom_up;
}

phys_addr_t memblock_phys_mem_size(void);
phys_addr_t memblock_reserved_size(void);
phys_addr_t memblock_start_of_DRAM(void);
phys_addr_t memblock_end_of_DRAM(void);
void memblock_enforce_memory_limit(phys_addr_t memory_limit);
void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
void memblock_mem_limit_remove_map(phys_addr_t limit);
bool memblock_is_memory(phys_addr_t addr);
bool memblock_is_map_memory(phys_addr_t addr);
bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
bool memblock_is_reserved(phys_addr_t addr);
bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);

void memblock_dump_all(void);

/**
 * memblock_set_current_limit - Set the current allocation limit to allow
 *                         limiting allocations to what is currently
 *                         accessible during boot
 * @limit: New limit value (physical address)
 */
void memblock_set_current_limit(phys_addr_t limit);


phys_addr_t memblock_get_current_limit(void);

/*
 * pfn conversion functions
 *
 * While the memory MEMBLOCKs should always be page aligned, the reserved
 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 * idea of what they return for such non aligned MEMBLOCKs.
 */

/**
 * memblock_region_memory_base_pfn - get the lowest pfn of the memory region
 * @reg: memblock_region structure
 *
 * Return: the lowest pfn intersecting with the memory region
 */
static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
{
	return PFN_UP(reg->base);
}

/**
 * memblock_region_memory_end_pfn - get the end pfn of the memory region
 * @reg: memblock_region structure
 *
 * Return: the end_pfn of the reserved region
 */
static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
{
	return PFN_DOWN(reg->base + reg->size);
}

/**
 * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region
 * @reg: memblock_region structure
 *
 * Return: the lowest pfn intersecting with the reserved region
 */
static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
{
	return PFN_DOWN(reg->base);
}

/**
 * memblock_region_reserved_end_pfn - get the end pfn of the reserved region
 * @reg: memblock_region structure
 *
 * Return: the end_pfn of the reserved region
 */
static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
{
	return PFN_UP(reg->base + reg->size);
}

/**
 * for_each_mem_region - itereate over memory regions
 * @region: loop variable
 */
#define for_each_mem_region(region)					\
	for (region = memblock.memory.regions;				\
	     region < (memblock.memory.regions + memblock.memory.cnt);	\
	     region++)

/**
 * for_each_reserved_mem_region - itereate over reserved memory regions
 * @region: loop variable
 */
#define for_each_reserved_mem_region(region)				\
	for (region = memblock.reserved.regions;			\
	     region < (memblock.reserved.regions + memblock.reserved.cnt); \
	     region++)

extern void *alloc_large_system_hash(const char *tablename,
				     unsigned long bucketsize,
				     unsigned long numentries,
				     int scale,
				     int flags,
				     unsigned int *_hash_shift,
				     unsigned int *_hash_mask,
				     unsigned long low_limit,
				     unsigned long high_limit);

#define HASH_EARLY	0x00000001	/* Allocating during early boot? */
#define HASH_SMALL	0x00000002	/* sub-page allocation allowed, min
					 * shift passed via *_hash_shift */
#define HASH_ZERO	0x00000004	/* Zero allocated hash table */

/* Only NUMA needs hash distribution. 64bit NUMA architectures have
 * sufficient vmalloc space.
 */
#ifdef CONFIG_NUMA
#define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
extern int hashdist;		/* Distribute hashes across NUMA nodes? */
#else
#define hashdist (0)
#endif

#ifdef CONFIG_MEMTEST
extern void early_memtest(phys_addr_t start, phys_addr_t end);
#else
static inline void early_memtest(phys_addr_t start, phys_addr_t end)
{
}
#endif

#endif /* __KERNEL__ */

#endif /* _LINUX_MEMBLOCK_H */