1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _LINUX_MEMBLOCK_H
3#define _LINUX_MEMBLOCK_H
4
5/*
6 * Logical memory blocks.
7 *
8 * Copyright (C) 2001 Peter Bergner, IBM Corp.
9 */
10
11#include <linux/init.h>
12#include <linux/mm.h>
13#include <asm/dma.h>
14
15extern unsigned long max_low_pfn;
16extern unsigned long min_low_pfn;
17
18/*
19 * highest page
20 */
21extern unsigned long max_pfn;
22/*
23 * highest possible page
24 */
25extern unsigned long long max_possible_pfn;
26
27/**
28 * enum memblock_flags - definition of memory region attributes
29 * @MEMBLOCK_NONE: no special request
30 * @MEMBLOCK_HOTPLUG: memory region indicated in the firmware-provided memory
31 * map during early boot as hot(un)pluggable system RAM (e.g., memory range
32 * that might get hotunplugged later). With "movable_node" set on the kernel
33 * commandline, try keeping this memory region hotunpluggable. Does not apply
34 * to memblocks added ("hotplugged") after early boot.
35 * @MEMBLOCK_MIRROR: mirrored region
36 * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as
37 * reserved in the memory map; refer to memblock_mark_nomap() description
38 * for further details
39 * @MEMBLOCK_DRIVER_MANAGED: memory region that is always detected and added
40 * via a driver, and never indicated in the firmware-provided memory map as
41 * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the
42 * kernel resource tree.
43 * @MEMBLOCK_RSRV_NOINIT: memory region for which struct pages are
44 * not initialized (only for reserved regions).
45 */
46enum memblock_flags {
47 MEMBLOCK_NONE = 0x0, /* No special request */
48 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */
49 MEMBLOCK_MIRROR = 0x2, /* mirrored region */
50 MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */
51 MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */
52 MEMBLOCK_RSRV_NOINIT = 0x10, /* don't initialize struct pages */
53};
54
55/**
56 * struct memblock_region - represents a memory region
57 * @base: base address of the region
58 * @size: size of the region
59 * @flags: memory region attributes
60 * @nid: NUMA node id
61 */
62struct memblock_region {
63 phys_addr_t base;
64 phys_addr_t size;
65 enum memblock_flags flags;
66#ifdef CONFIG_NUMA
67 int nid;
68#endif
69};
70
71/**
72 * struct memblock_type - collection of memory regions of certain type
73 * @cnt: number of regions
74 * @max: size of the allocated array
75 * @total_size: size of all regions
76 * @regions: array of regions
77 * @name: the memory type symbolic name
78 */
79struct memblock_type {
80 unsigned long cnt;
81 unsigned long max;
82 phys_addr_t total_size;
83 struct memblock_region *regions;
84 char *name;
85};
86
87/**
88 * struct memblock - memblock allocator metadata
89 * @bottom_up: is bottom up direction?
90 * @current_limit: physical address of the current allocation limit
91 * @memory: usable memory regions
92 * @reserved: reserved memory regions
93 */
94struct memblock {
95 bool bottom_up; /* is bottom up direction? */
96 phys_addr_t current_limit;
97 struct memblock_type memory;
98 struct memblock_type reserved;
99};
100
101extern struct memblock memblock;
102
103#ifndef CONFIG_ARCH_KEEP_MEMBLOCK
104#define __init_memblock __meminit
105#define __initdata_memblock __meminitdata
106void memblock_discard(void);
107#else
108#define __init_memblock
109#define __initdata_memblock
110static inline void memblock_discard(void) {}
111#endif
112
113void memblock_allow_resize(void);
114int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid,
115 enum memblock_flags flags);
116int memblock_add(phys_addr_t base, phys_addr_t size);
117int memblock_remove(phys_addr_t base, phys_addr_t size);
118int memblock_phys_free(phys_addr_t base, phys_addr_t size);
119int memblock_reserve(phys_addr_t base, phys_addr_t size);
120#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
121int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
122#endif
123void memblock_trim_memory(phys_addr_t align);
124bool memblock_overlaps_region(struct memblock_type *type,
125 phys_addr_t base, phys_addr_t size);
126int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
127int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
128int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
129int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
130int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
131int memblock_reserved_mark_noinit(phys_addr_t base, phys_addr_t size);
132
133void memblock_free_all(void);
134void memblock_free(void *ptr, size_t size);
135void reset_all_zones_managed_pages(void);
136
137/* Low level functions */
138void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
139 struct memblock_type *type_a,
140 struct memblock_type *type_b, phys_addr_t *out_start,
141 phys_addr_t *out_end, int *out_nid);
142
143void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags,
144 struct memblock_type *type_a,
145 struct memblock_type *type_b, phys_addr_t *out_start,
146 phys_addr_t *out_end, int *out_nid);
147
148void memblock_free_late(phys_addr_t base, phys_addr_t size);
149
150#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
151static inline void __next_physmem_range(u64 *idx, struct memblock_type *type,
152 phys_addr_t *out_start,
153 phys_addr_t *out_end)
154{
155 extern struct memblock_type physmem;
156
157 __next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type,
158 out_start, out_end, NULL);
159}
160
161/**
162 * for_each_physmem_range - iterate through physmem areas not included in type.
163 * @i: u64 used as loop variable
164 * @type: ptr to memblock_type which excludes from the iteration, can be %NULL
165 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
166 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
167 */
168#define for_each_physmem_range(i, type, p_start, p_end) \
169 for (i = 0, __next_physmem_range(&i, type, p_start, p_end); \
170 i != (u64)ULLONG_MAX; \
171 __next_physmem_range(&i, type, p_start, p_end))
172#endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */
173
174/**
175 * __for_each_mem_range - iterate through memblock areas from type_a and not
176 * included in type_b. Or just type_a if type_b is NULL.
177 * @i: u64 used as loop variable
178 * @type_a: ptr to memblock_type to iterate
179 * @type_b: ptr to memblock_type which excludes from the iteration
180 * @nid: node selector, %NUMA_NO_NODE for all nodes
181 * @flags: pick from blocks based on memory attributes
182 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
183 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
184 * @p_nid: ptr to int for nid of the range, can be %NULL
185 */
186#define __for_each_mem_range(i, type_a, type_b, nid, flags, \
187 p_start, p_end, p_nid) \
188 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \
189 p_start, p_end, p_nid); \
190 i != (u64)ULLONG_MAX; \
191 __next_mem_range(&i, nid, flags, type_a, type_b, \
192 p_start, p_end, p_nid))
193
194/**
195 * __for_each_mem_range_rev - reverse iterate through memblock areas from
196 * type_a and not included in type_b. Or just type_a if type_b is NULL.
197 * @i: u64 used as loop variable
198 * @type_a: ptr to memblock_type to iterate
199 * @type_b: ptr to memblock_type which excludes from the iteration
200 * @nid: node selector, %NUMA_NO_NODE for all nodes
201 * @flags: pick from blocks based on memory attributes
202 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
203 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
204 * @p_nid: ptr to int for nid of the range, can be %NULL
205 */
206#define __for_each_mem_range_rev(i, type_a, type_b, nid, flags, \
207 p_start, p_end, p_nid) \
208 for (i = (u64)ULLONG_MAX, \
209 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
210 p_start, p_end, p_nid); \
211 i != (u64)ULLONG_MAX; \
212 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
213 p_start, p_end, p_nid))
214
215/**
216 * for_each_mem_range - iterate through memory areas.
217 * @i: u64 used as loop variable
218 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
219 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
220 */
221#define for_each_mem_range(i, p_start, p_end) \
222 __for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, \
223 MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED, \
224 p_start, p_end, NULL)
225
226/**
227 * for_each_mem_range_rev - reverse iterate through memblock areas from
228 * type_a and not included in type_b. Or just type_a if type_b is NULL.
229 * @i: u64 used as loop variable
230 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
231 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
232 */
233#define for_each_mem_range_rev(i, p_start, p_end) \
234 __for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \
235 MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED,\
236 p_start, p_end, NULL)
237
238/**
239 * for_each_reserved_mem_range - iterate over all reserved memblock areas
240 * @i: u64 used as loop variable
241 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
242 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
243 *
244 * Walks over reserved areas of memblock. Available as soon as memblock
245 * is initialized.
246 */
247#define for_each_reserved_mem_range(i, p_start, p_end) \
248 __for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE, \
249 MEMBLOCK_NONE, p_start, p_end, NULL)
250
251static inline bool memblock_is_hotpluggable(struct memblock_region *m)
252{
253 return m->flags & MEMBLOCK_HOTPLUG;
254}
255
256static inline bool memblock_is_mirror(struct memblock_region *m)
257{
258 return m->flags & MEMBLOCK_MIRROR;
259}
260
261static inline bool memblock_is_nomap(struct memblock_region *m)
262{
263 return m->flags & MEMBLOCK_NOMAP;
264}
265
266static inline bool memblock_is_reserved_noinit(struct memblock_region *m)
267{
268 return m->flags & MEMBLOCK_RSRV_NOINIT;
269}
270
271static inline bool memblock_is_driver_managed(struct memblock_region *m)
272{
273 return m->flags & MEMBLOCK_DRIVER_MANAGED;
274}
275
276int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
277 unsigned long *end_pfn);
278void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
279 unsigned long *out_end_pfn, int *out_nid);
280
281/**
282 * for_each_mem_pfn_range - early memory pfn range iterator
283 * @i: an integer used as loop variable
284 * @nid: node selector, %MAX_NUMNODES for all nodes
285 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
286 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
287 * @p_nid: ptr to int for nid of the range, can be %NULL
288 *
289 * Walks over configured memory ranges.
290 */
291#define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
292 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
293 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
294
295#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
296void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
297 unsigned long *out_spfn,
298 unsigned long *out_epfn);
299/**
300 * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free
301 * memblock areas
302 * @i: u64 used as loop variable
303 * @zone: zone in which all of the memory blocks reside
304 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
305 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
306 *
307 * Walks over free (memory && !reserved) areas of memblock in a specific
308 * zone. Available once memblock and an empty zone is initialized. The main
309 * assumption is that the zone start, end, and pgdat have been associated.
310 * This way we can use the zone to determine NUMA node, and if a given part
311 * of the memblock is valid for the zone.
312 */
313#define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end) \
314 for (i = 0, \
315 __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end); \
316 i != U64_MAX; \
317 __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
318
319/**
320 * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
321 * free memblock areas from a given point
322 * @i: u64 used as loop variable
323 * @zone: zone in which all of the memory blocks reside
324 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
325 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
326 *
327 * Walks over free (memory && !reserved) areas of memblock in a specific
328 * zone, continuing from current position. Available as soon as memblock is
329 * initialized.
330 */
331#define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
332 for (; i != U64_MAX; \
333 __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
334
335int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask);
336
337#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
338
339/**
340 * for_each_free_mem_range - iterate through free memblock areas
341 * @i: u64 used as loop variable
342 * @nid: node selector, %NUMA_NO_NODE for all nodes
343 * @flags: pick from blocks based on memory attributes
344 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
345 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
346 * @p_nid: ptr to int for nid of the range, can be %NULL
347 *
348 * Walks over free (memory && !reserved) areas of memblock. Available as
349 * soon as memblock is initialized.
350 */
351#define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \
352 __for_each_mem_range(i, &memblock.memory, &memblock.reserved, \
353 nid, flags, p_start, p_end, p_nid)
354
355/**
356 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
357 * @i: u64 used as loop variable
358 * @nid: node selector, %NUMA_NO_NODE for all nodes
359 * @flags: pick from blocks based on memory attributes
360 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
361 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
362 * @p_nid: ptr to int for nid of the range, can be %NULL
363 *
364 * Walks over free (memory && !reserved) areas of memblock in reverse
365 * order. Available as soon as memblock is initialized.
366 */
367#define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \
368 p_nid) \
369 __for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
370 nid, flags, p_start, p_end, p_nid)
371
372int memblock_set_node(phys_addr_t base, phys_addr_t size,
373 struct memblock_type *type, int nid);
374
375#ifdef CONFIG_NUMA
376static inline void memblock_set_region_node(struct memblock_region *r, int nid)
377{
378 r->nid = nid;
379}
380
381static inline int memblock_get_region_node(const struct memblock_region *r)
382{
383 return r->nid;
384}
385#else
386static inline void memblock_set_region_node(struct memblock_region *r, int nid)
387{
388}
389
390static inline int memblock_get_region_node(const struct memblock_region *r)
391{
392 return 0;
393}
394#endif /* CONFIG_NUMA */
395
396/* Flags for memblock allocation APIs */
397#define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
398#define MEMBLOCK_ALLOC_ACCESSIBLE 0
399#define MEMBLOCK_ALLOC_NOLEAKTRACE 1
400
401/* We are using top down, so it is safe to use 0 here */
402#define MEMBLOCK_LOW_LIMIT 0
403
404#ifndef ARCH_LOW_ADDRESS_LIMIT
405#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
406#endif
407
408phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
409 phys_addr_t start, phys_addr_t end);
410phys_addr_t memblock_alloc_range_nid(phys_addr_t size,
411 phys_addr_t align, phys_addr_t start,
412 phys_addr_t end, int nid, bool exact_nid);
413phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
414
415static __always_inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
416 phys_addr_t align)
417{
418 return memblock_phys_alloc_range(size, align, start: 0,
419 MEMBLOCK_ALLOC_ACCESSIBLE);
420}
421
422void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align,
423 phys_addr_t min_addr, phys_addr_t max_addr,
424 int nid);
425void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
426 phys_addr_t min_addr, phys_addr_t max_addr,
427 int nid);
428void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
429 phys_addr_t min_addr, phys_addr_t max_addr,
430 int nid);
431
432static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align)
433{
434 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
435 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
436}
437
438static inline void *memblock_alloc_raw(phys_addr_t size,
439 phys_addr_t align)
440{
441 return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT,
442 MEMBLOCK_ALLOC_ACCESSIBLE,
443 NUMA_NO_NODE);
444}
445
446static inline void *memblock_alloc_from(phys_addr_t size,
447 phys_addr_t align,
448 phys_addr_t min_addr)
449{
450 return memblock_alloc_try_nid(size, align, min_addr,
451 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
452}
453
454static inline void *memblock_alloc_low(phys_addr_t size,
455 phys_addr_t align)
456{
457 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
458 ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE);
459}
460
461static inline void *memblock_alloc_node(phys_addr_t size,
462 phys_addr_t align, int nid)
463{
464 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
465 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
466}
467
468/*
469 * Set the allocation direction to bottom-up or top-down.
470 */
471static inline __init_memblock void memblock_set_bottom_up(bool enable)
472{
473 memblock.bottom_up = enable;
474}
475
476/*
477 * Check if the allocation direction is bottom-up or not.
478 * if this is true, that said, memblock will allocate memory
479 * in bottom-up direction.
480 */
481static inline __init_memblock bool memblock_bottom_up(void)
482{
483 return memblock.bottom_up;
484}
485
486phys_addr_t memblock_phys_mem_size(void);
487phys_addr_t memblock_reserved_size(void);
488phys_addr_t memblock_start_of_DRAM(void);
489phys_addr_t memblock_end_of_DRAM(void);
490void memblock_enforce_memory_limit(phys_addr_t memory_limit);
491void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
492void memblock_mem_limit_remove_map(phys_addr_t limit);
493bool memblock_is_memory(phys_addr_t addr);
494bool memblock_is_map_memory(phys_addr_t addr);
495bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
496bool memblock_is_reserved(phys_addr_t addr);
497bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
498
499void memblock_dump_all(void);
500
501/**
502 * memblock_set_current_limit - Set the current allocation limit to allow
503 * limiting allocations to what is currently
504 * accessible during boot
505 * @limit: New limit value (physical address)
506 */
507void memblock_set_current_limit(phys_addr_t limit);
508
509
510phys_addr_t memblock_get_current_limit(void);
511
512/*
513 * pfn conversion functions
514 *
515 * While the memory MEMBLOCKs should always be page aligned, the reserved
516 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
517 * idea of what they return for such non aligned MEMBLOCKs.
518 */
519
520/**
521 * memblock_region_memory_base_pfn - get the lowest pfn of the memory region
522 * @reg: memblock_region structure
523 *
524 * Return: the lowest pfn intersecting with the memory region
525 */
526static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
527{
528 return PFN_UP(reg->base);
529}
530
531/**
532 * memblock_region_memory_end_pfn - get the end pfn of the memory region
533 * @reg: memblock_region structure
534 *
535 * Return: the end_pfn of the reserved region
536 */
537static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
538{
539 return PFN_DOWN(reg->base + reg->size);
540}
541
542/**
543 * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region
544 * @reg: memblock_region structure
545 *
546 * Return: the lowest pfn intersecting with the reserved region
547 */
548static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
549{
550 return PFN_DOWN(reg->base);
551}
552
553/**
554 * memblock_region_reserved_end_pfn - get the end pfn of the reserved region
555 * @reg: memblock_region structure
556 *
557 * Return: the end_pfn of the reserved region
558 */
559static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
560{
561 return PFN_UP(reg->base + reg->size);
562}
563
564/**
565 * for_each_mem_region - itereate over memory regions
566 * @region: loop variable
567 */
568#define for_each_mem_region(region) \
569 for (region = memblock.memory.regions; \
570 region < (memblock.memory.regions + memblock.memory.cnt); \
571 region++)
572
573/**
574 * for_each_reserved_mem_region - itereate over reserved memory regions
575 * @region: loop variable
576 */
577#define for_each_reserved_mem_region(region) \
578 for (region = memblock.reserved.regions; \
579 region < (memblock.reserved.regions + memblock.reserved.cnt); \
580 region++)
581
582extern void *alloc_large_system_hash(const char *tablename,
583 unsigned long bucketsize,
584 unsigned long numentries,
585 int scale,
586 int flags,
587 unsigned int *_hash_shift,
588 unsigned int *_hash_mask,
589 unsigned long low_limit,
590 unsigned long high_limit);
591
592#define HASH_EARLY 0x00000001 /* Allocating during early boot? */
593#define HASH_ZERO 0x00000002 /* Zero allocated hash table */
594
595/* Only NUMA needs hash distribution. 64bit NUMA architectures have
596 * sufficient vmalloc space.
597 */
598#ifdef CONFIG_NUMA
599#define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
600extern int hashdist; /* Distribute hashes across NUMA nodes? */
601#else
602#define hashdist (0)
603#endif
604
605#ifdef CONFIG_MEMTEST
606void early_memtest(phys_addr_t start, phys_addr_t end);
607void memtest_report_meminfo(struct seq_file *m);
608#else
609static inline void early_memtest(phys_addr_t start, phys_addr_t end) { }
610static inline void memtest_report_meminfo(struct seq_file *m) { }
611#endif
612
613
614#endif /* _LINUX_MEMBLOCK_H */
615

source code of linux/include/linux/memblock.h