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0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 #ifndef _LINUX_MEMBLOCK_H
0003 #define _LINUX_MEMBLOCK_H
0004 
0005 /*
0006  * Logical memory blocks.
0007  *
0008  * Copyright (C) 2001 Peter Bergner, IBM Corp.
0009  */
0010 
0011 #include <linux/init.h>
0012 #include <linux/mm.h>
0013 #include <asm/dma.h>
0014 
0015 extern unsigned long max_low_pfn;
0016 extern unsigned long min_low_pfn;
0017 
0018 /*
0019  * highest page
0020  */
0021 extern unsigned long max_pfn;
0022 /*
0023  * highest possible page
0024  */
0025 extern unsigned long long max_possible_pfn;
0026 
0027 /**
0028  * enum memblock_flags - definition of memory region attributes
0029  * @MEMBLOCK_NONE: no special request
0030  * @MEMBLOCK_HOTPLUG: memory region indicated in the firmware-provided memory
0031  * map during early boot as hot(un)pluggable system RAM (e.g., memory range
0032  * that might get hotunplugged later). With "movable_node" set on the kernel
0033  * commandline, try keeping this memory region hotunpluggable. Does not apply
0034  * to memblocks added ("hotplugged") after early boot.
0035  * @MEMBLOCK_MIRROR: mirrored region
0036  * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as
0037  * reserved in the memory map; refer to memblock_mark_nomap() description
0038  * for further details
0039  * @MEMBLOCK_DRIVER_MANAGED: memory region that is always detected and added
0040  * via a driver, and never indicated in the firmware-provided memory map as
0041  * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the
0042  * kernel resource tree.
0043  */
0044 enum memblock_flags {
0045     MEMBLOCK_NONE       = 0x0,  /* No special request */
0046     MEMBLOCK_HOTPLUG    = 0x1,  /* hotpluggable region */
0047     MEMBLOCK_MIRROR     = 0x2,  /* mirrored region */
0048     MEMBLOCK_NOMAP      = 0x4,  /* don't add to kernel direct mapping */
0049     MEMBLOCK_DRIVER_MANAGED = 0x8,  /* always detected via a driver */
0050 };
0051 
0052 /**
0053  * struct memblock_region - represents a memory region
0054  * @base: base address of the region
0055  * @size: size of the region
0056  * @flags: memory region attributes
0057  * @nid: NUMA node id
0058  */
0059 struct memblock_region {
0060     phys_addr_t base;
0061     phys_addr_t size;
0062     enum memblock_flags flags;
0063 #ifdef CONFIG_NUMA
0064     int nid;
0065 #endif
0066 };
0067 
0068 /**
0069  * struct memblock_type - collection of memory regions of certain type
0070  * @cnt: number of regions
0071  * @max: size of the allocated array
0072  * @total_size: size of all regions
0073  * @regions: array of regions
0074  * @name: the memory type symbolic name
0075  */
0076 struct memblock_type {
0077     unsigned long cnt;
0078     unsigned long max;
0079     phys_addr_t total_size;
0080     struct memblock_region *regions;
0081     char *name;
0082 };
0083 
0084 /**
0085  * struct memblock - memblock allocator metadata
0086  * @bottom_up: is bottom up direction?
0087  * @current_limit: physical address of the current allocation limit
0088  * @memory: usable memory regions
0089  * @reserved: reserved memory regions
0090  */
0091 struct memblock {
0092     bool bottom_up;  /* is bottom up direction? */
0093     phys_addr_t current_limit;
0094     struct memblock_type memory;
0095     struct memblock_type reserved;
0096 };
0097 
0098 extern struct memblock memblock;
0099 
0100 #ifndef CONFIG_ARCH_KEEP_MEMBLOCK
0101 #define __init_memblock __meminit
0102 #define __initdata_memblock __meminitdata
0103 void memblock_discard(void);
0104 #else
0105 #define __init_memblock
0106 #define __initdata_memblock
0107 static inline void memblock_discard(void) {}
0108 #endif
0109 
0110 void memblock_allow_resize(void);
0111 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid,
0112               enum memblock_flags flags);
0113 int memblock_add(phys_addr_t base, phys_addr_t size);
0114 int memblock_remove(phys_addr_t base, phys_addr_t size);
0115 int memblock_phys_free(phys_addr_t base, phys_addr_t size);
0116 int memblock_reserve(phys_addr_t base, phys_addr_t size);
0117 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
0118 int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
0119 #endif
0120 void memblock_trim_memory(phys_addr_t align);
0121 bool memblock_overlaps_region(struct memblock_type *type,
0122                   phys_addr_t base, phys_addr_t size);
0123 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
0124 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
0125 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
0126 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
0127 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
0128 
0129 void memblock_free_all(void);
0130 void memblock_free(void *ptr, size_t size);
0131 void reset_node_managed_pages(pg_data_t *pgdat);
0132 void reset_all_zones_managed_pages(void);
0133 
0134 /* Low level functions */
0135 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
0136               struct memblock_type *type_a,
0137               struct memblock_type *type_b, phys_addr_t *out_start,
0138               phys_addr_t *out_end, int *out_nid);
0139 
0140 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags,
0141               struct memblock_type *type_a,
0142               struct memblock_type *type_b, phys_addr_t *out_start,
0143               phys_addr_t *out_end, int *out_nid);
0144 
0145 void memblock_free_late(phys_addr_t base, phys_addr_t size);
0146 
0147 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
0148 static inline void __next_physmem_range(u64 *idx, struct memblock_type *type,
0149                     phys_addr_t *out_start,
0150                     phys_addr_t *out_end)
0151 {
0152     extern struct memblock_type physmem;
0153 
0154     __next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type,
0155              out_start, out_end, NULL);
0156 }
0157 
0158 /**
0159  * for_each_physmem_range - iterate through physmem areas not included in type.
0160  * @i: u64 used as loop variable
0161  * @type: ptr to memblock_type which excludes from the iteration, can be %NULL
0162  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0163  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0164  */
0165 #define for_each_physmem_range(i, type, p_start, p_end)         \
0166     for (i = 0, __next_physmem_range(&i, type, p_start, p_end); \
0167          i != (u64)ULLONG_MAX;                  \
0168          __next_physmem_range(&i, type, p_start, p_end))
0169 #endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */
0170 
0171 /**
0172  * __for_each_mem_range - iterate through memblock areas from type_a and not
0173  * included in type_b. Or just type_a if type_b is NULL.
0174  * @i: u64 used as loop variable
0175  * @type_a: ptr to memblock_type to iterate
0176  * @type_b: ptr to memblock_type which excludes from the iteration
0177  * @nid: node selector, %NUMA_NO_NODE for all nodes
0178  * @flags: pick from blocks based on memory attributes
0179  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0180  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0181  * @p_nid: ptr to int for nid of the range, can be %NULL
0182  */
0183 #define __for_each_mem_range(i, type_a, type_b, nid, flags,     \
0184                p_start, p_end, p_nid)           \
0185     for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,    \
0186                      p_start, p_end, p_nid);        \
0187          i != (u64)ULLONG_MAX;                  \
0188          __next_mem_range(&i, nid, flags, type_a, type_b,       \
0189                   p_start, p_end, p_nid))
0190 
0191 /**
0192  * __for_each_mem_range_rev - reverse iterate through memblock areas from
0193  * type_a and not included in type_b. Or just type_a if type_b is NULL.
0194  * @i: u64 used as loop variable
0195  * @type_a: ptr to memblock_type to iterate
0196  * @type_b: ptr to memblock_type which excludes from the iteration
0197  * @nid: node selector, %NUMA_NO_NODE for all nodes
0198  * @flags: pick from blocks based on memory attributes
0199  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0200  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0201  * @p_nid: ptr to int for nid of the range, can be %NULL
0202  */
0203 #define __for_each_mem_range_rev(i, type_a, type_b, nid, flags,     \
0204                  p_start, p_end, p_nid)         \
0205     for (i = (u64)ULLONG_MAX,                   \
0206              __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
0207                       p_start, p_end, p_nid);   \
0208          i != (u64)ULLONG_MAX;                  \
0209          __next_mem_range_rev(&i, nid, flags, type_a, type_b,   \
0210                   p_start, p_end, p_nid))
0211 
0212 /**
0213  * for_each_mem_range - iterate through memory areas.
0214  * @i: u64 used as loop variable
0215  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0216  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0217  */
0218 #define for_each_mem_range(i, p_start, p_end) \
0219     __for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE,   \
0220                  MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED, \
0221                  p_start, p_end, NULL)
0222 
0223 /**
0224  * for_each_mem_range_rev - reverse iterate through memblock areas from
0225  * type_a and not included in type_b. Or just type_a if type_b is NULL.
0226  * @i: u64 used as loop variable
0227  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0228  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0229  */
0230 #define for_each_mem_range_rev(i, p_start, p_end)           \
0231     __for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \
0232                  MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED,\
0233                  p_start, p_end, NULL)
0234 
0235 /**
0236  * for_each_reserved_mem_range - iterate over all reserved memblock areas
0237  * @i: u64 used as loop variable
0238  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0239  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0240  *
0241  * Walks over reserved areas of memblock. Available as soon as memblock
0242  * is initialized.
0243  */
0244 #define for_each_reserved_mem_range(i, p_start, p_end)          \
0245     __for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE, \
0246                  MEMBLOCK_NONE, p_start, p_end, NULL)
0247 
0248 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
0249 {
0250     return m->flags & MEMBLOCK_HOTPLUG;
0251 }
0252 
0253 static inline bool memblock_is_mirror(struct memblock_region *m)
0254 {
0255     return m->flags & MEMBLOCK_MIRROR;
0256 }
0257 
0258 static inline bool memblock_is_nomap(struct memblock_region *m)
0259 {
0260     return m->flags & MEMBLOCK_NOMAP;
0261 }
0262 
0263 static inline bool memblock_is_driver_managed(struct memblock_region *m)
0264 {
0265     return m->flags & MEMBLOCK_DRIVER_MANAGED;
0266 }
0267 
0268 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
0269                 unsigned long  *end_pfn);
0270 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
0271               unsigned long *out_end_pfn, int *out_nid);
0272 
0273 /**
0274  * for_each_mem_pfn_range - early memory pfn range iterator
0275  * @i: an integer used as loop variable
0276  * @nid: node selector, %MAX_NUMNODES for all nodes
0277  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
0278  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
0279  * @p_nid: ptr to int for nid of the range, can be %NULL
0280  *
0281  * Walks over configured memory ranges.
0282  */
0283 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)       \
0284     for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
0285          i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
0286 
0287 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
0288 void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
0289                   unsigned long *out_spfn,
0290                   unsigned long *out_epfn);
0291 /**
0292  * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free
0293  * memblock areas
0294  * @i: u64 used as loop variable
0295  * @zone: zone in which all of the memory blocks reside
0296  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0297  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0298  *
0299  * Walks over free (memory && !reserved) areas of memblock in a specific
0300  * zone. Available once memblock and an empty zone is initialized. The main
0301  * assumption is that the zone start, end, and pgdat have been associated.
0302  * This way we can use the zone to determine NUMA node, and if a given part
0303  * of the memblock is valid for the zone.
0304  */
0305 #define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end)    \
0306     for (i = 0,                         \
0307          __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end);    \
0308          i != U64_MAX;                  \
0309          __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
0310 
0311 /**
0312  * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
0313  * free memblock areas from a given point
0314  * @i: u64 used as loop variable
0315  * @zone: zone in which all of the memory blocks reside
0316  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0317  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0318  *
0319  * Walks over free (memory && !reserved) areas of memblock in a specific
0320  * zone, continuing from current position. Available as soon as memblock is
0321  * initialized.
0322  */
0323 #define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
0324     for (; i != U64_MAX;                      \
0325          __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
0326 
0327 int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask);
0328 
0329 #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
0330 
0331 /**
0332  * for_each_free_mem_range - iterate through free memblock areas
0333  * @i: u64 used as loop variable
0334  * @nid: node selector, %NUMA_NO_NODE for all nodes
0335  * @flags: pick from blocks based on memory attributes
0336  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0337  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0338  * @p_nid: ptr to int for nid of the range, can be %NULL
0339  *
0340  * Walks over free (memory && !reserved) areas of memblock.  Available as
0341  * soon as memblock is initialized.
0342  */
0343 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)   \
0344     __for_each_mem_range(i, &memblock.memory, &memblock.reserved,   \
0345                  nid, flags, p_start, p_end, p_nid)
0346 
0347 /**
0348  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
0349  * @i: u64 used as loop variable
0350  * @nid: node selector, %NUMA_NO_NODE for all nodes
0351  * @flags: pick from blocks based on memory attributes
0352  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
0353  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
0354  * @p_nid: ptr to int for nid of the range, can be %NULL
0355  *
0356  * Walks over free (memory && !reserved) areas of memblock in reverse
0357  * order.  Available as soon as memblock is initialized.
0358  */
0359 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,  \
0360                     p_nid)              \
0361     __for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
0362                  nid, flags, p_start, p_end, p_nid)
0363 
0364 int memblock_set_node(phys_addr_t base, phys_addr_t size,
0365               struct memblock_type *type, int nid);
0366 
0367 #ifdef CONFIG_NUMA
0368 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
0369 {
0370     r->nid = nid;
0371 }
0372 
0373 static inline int memblock_get_region_node(const struct memblock_region *r)
0374 {
0375     return r->nid;
0376 }
0377 #else
0378 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
0379 {
0380 }
0381 
0382 static inline int memblock_get_region_node(const struct memblock_region *r)
0383 {
0384     return 0;
0385 }
0386 #endif /* CONFIG_NUMA */
0387 
0388 /* Flags for memblock allocation APIs */
0389 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
0390 #define MEMBLOCK_ALLOC_ACCESSIBLE   0
0391 #define MEMBLOCK_ALLOC_NOLEAKTRACE  1
0392 
0393 /* We are using top down, so it is safe to use 0 here */
0394 #define MEMBLOCK_LOW_LIMIT 0
0395 
0396 #ifndef ARCH_LOW_ADDRESS_LIMIT
0397 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
0398 #endif
0399 
0400 phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
0401                       phys_addr_t start, phys_addr_t end);
0402 phys_addr_t memblock_alloc_range_nid(phys_addr_t size,
0403                       phys_addr_t align, phys_addr_t start,
0404                       phys_addr_t end, int nid, bool exact_nid);
0405 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
0406 
0407 static __always_inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
0408                                phys_addr_t align)
0409 {
0410     return memblock_phys_alloc_range(size, align, 0,
0411                      MEMBLOCK_ALLOC_ACCESSIBLE);
0412 }
0413 
0414 void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align,
0415                  phys_addr_t min_addr, phys_addr_t max_addr,
0416                  int nid);
0417 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
0418                  phys_addr_t min_addr, phys_addr_t max_addr,
0419                  int nid);
0420 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
0421                  phys_addr_t min_addr, phys_addr_t max_addr,
0422                  int nid);
0423 
0424 static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align)
0425 {
0426     return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
0427                       MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
0428 }
0429 
0430 static inline void *memblock_alloc_raw(phys_addr_t size,
0431                            phys_addr_t align)
0432 {
0433     return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT,
0434                       MEMBLOCK_ALLOC_ACCESSIBLE,
0435                       NUMA_NO_NODE);
0436 }
0437 
0438 static inline void *memblock_alloc_from(phys_addr_t size,
0439                         phys_addr_t align,
0440                         phys_addr_t min_addr)
0441 {
0442     return memblock_alloc_try_nid(size, align, min_addr,
0443                       MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
0444 }
0445 
0446 static inline void *memblock_alloc_low(phys_addr_t size,
0447                            phys_addr_t align)
0448 {
0449     return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
0450                       ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE);
0451 }
0452 
0453 static inline void *memblock_alloc_node(phys_addr_t size,
0454                         phys_addr_t align, int nid)
0455 {
0456     return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
0457                       MEMBLOCK_ALLOC_ACCESSIBLE, nid);
0458 }
0459 
0460 /*
0461  * Set the allocation direction to bottom-up or top-down.
0462  */
0463 static inline __init_memblock void memblock_set_bottom_up(bool enable)
0464 {
0465     memblock.bottom_up = enable;
0466 }
0467 
0468 /*
0469  * Check if the allocation direction is bottom-up or not.
0470  * if this is true, that said, memblock will allocate memory
0471  * in bottom-up direction.
0472  */
0473 static inline __init_memblock bool memblock_bottom_up(void)
0474 {
0475     return memblock.bottom_up;
0476 }
0477 
0478 phys_addr_t memblock_phys_mem_size(void);
0479 phys_addr_t memblock_reserved_size(void);
0480 phys_addr_t memblock_start_of_DRAM(void);
0481 phys_addr_t memblock_end_of_DRAM(void);
0482 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
0483 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
0484 void memblock_mem_limit_remove_map(phys_addr_t limit);
0485 bool memblock_is_memory(phys_addr_t addr);
0486 bool memblock_is_map_memory(phys_addr_t addr);
0487 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
0488 bool memblock_is_reserved(phys_addr_t addr);
0489 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
0490 
0491 void memblock_dump_all(void);
0492 
0493 /**
0494  * memblock_set_current_limit - Set the current allocation limit to allow
0495  *                         limiting allocations to what is currently
0496  *                         accessible during boot
0497  * @limit: New limit value (physical address)
0498  */
0499 void memblock_set_current_limit(phys_addr_t limit);
0500 
0501 
0502 phys_addr_t memblock_get_current_limit(void);
0503 
0504 /*
0505  * pfn conversion functions
0506  *
0507  * While the memory MEMBLOCKs should always be page aligned, the reserved
0508  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
0509  * idea of what they return for such non aligned MEMBLOCKs.
0510  */
0511 
0512 /**
0513  * memblock_region_memory_base_pfn - get the lowest pfn of the memory region
0514  * @reg: memblock_region structure
0515  *
0516  * Return: the lowest pfn intersecting with the memory region
0517  */
0518 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
0519 {
0520     return PFN_UP(reg->base);
0521 }
0522 
0523 /**
0524  * memblock_region_memory_end_pfn - get the end pfn of the memory region
0525  * @reg: memblock_region structure
0526  *
0527  * Return: the end_pfn of the reserved region
0528  */
0529 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
0530 {
0531     return PFN_DOWN(reg->base + reg->size);
0532 }
0533 
0534 /**
0535  * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region
0536  * @reg: memblock_region structure
0537  *
0538  * Return: the lowest pfn intersecting with the reserved region
0539  */
0540 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
0541 {
0542     return PFN_DOWN(reg->base);
0543 }
0544 
0545 /**
0546  * memblock_region_reserved_end_pfn - get the end pfn of the reserved region
0547  * @reg: memblock_region structure
0548  *
0549  * Return: the end_pfn of the reserved region
0550  */
0551 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
0552 {
0553     return PFN_UP(reg->base + reg->size);
0554 }
0555 
0556 /**
0557  * for_each_mem_region - itereate over memory regions
0558  * @region: loop variable
0559  */
0560 #define for_each_mem_region(region)                 \
0561     for (region = memblock.memory.regions;              \
0562          region < (memblock.memory.regions + memblock.memory.cnt);  \
0563          region++)
0564 
0565 /**
0566  * for_each_reserved_mem_region - itereate over reserved memory regions
0567  * @region: loop variable
0568  */
0569 #define for_each_reserved_mem_region(region)                \
0570     for (region = memblock.reserved.regions;            \
0571          region < (memblock.reserved.regions + memblock.reserved.cnt); \
0572          region++)
0573 
0574 extern void *alloc_large_system_hash(const char *tablename,
0575                      unsigned long bucketsize,
0576                      unsigned long numentries,
0577                      int scale,
0578                      int flags,
0579                      unsigned int *_hash_shift,
0580                      unsigned int *_hash_mask,
0581                      unsigned long low_limit,
0582                      unsigned long high_limit);
0583 
0584 #define HASH_EARLY  0x00000001  /* Allocating during early boot? */
0585 #define HASH_SMALL  0x00000002  /* sub-page allocation allowed, min
0586                      * shift passed via *_hash_shift */
0587 #define HASH_ZERO   0x00000004  /* Zero allocated hash table */
0588 
0589 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
0590  * sufficient vmalloc space.
0591  */
0592 #ifdef CONFIG_NUMA
0593 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
0594 extern int hashdist;        /* Distribute hashes across NUMA nodes? */
0595 #else
0596 #define hashdist (0)
0597 #endif
0598 
0599 #ifdef CONFIG_MEMTEST
0600 extern void early_memtest(phys_addr_t start, phys_addr_t end);
0601 #else
0602 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
0603 {
0604 }
0605 #endif
0606 
0607 
0608 #endif /* _LINUX_MEMBLOCK_H */
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