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1 | /* | |
2 | * bootmem - A boot-time physical memory allocator and configurator | |
3 | * | |
4 | * Copyright (C) 1999 Ingo Molnar | |
5 | * 1999 Kanoj Sarcar, SGI | |
6 | * 2008 Johannes Weiner | |
7 | * | |
8 | * Access to this subsystem has to be serialized externally (which is true | |
9 | * for the boot process anyway). | |
10 | */ | |
11 | #include <linux/init.h> | |
12 | #include <linux/pfn.h> | |
13 | #include <linux/bootmem.h> | |
14 | #include <linux/module.h> | |
15 | ||
16 | #include <asm/bug.h> | |
17 | #include <asm/io.h> | |
18 | #include <asm/processor.h> | |
19 | ||
20 | #include "internal.h" | |
21 | ||
22 | unsigned long max_low_pfn; | |
23 | unsigned long min_low_pfn; | |
24 | unsigned long max_pfn; | |
25 | ||
26 | #ifdef CONFIG_CRASH_DUMP | |
27 | /* | |
28 | * If we have booted due to a crash, max_pfn will be a very low value. We need | |
29 | * to know the amount of memory that the previous kernel used. | |
30 | */ | |
31 | unsigned long saved_max_pfn; | |
32 | #endif | |
33 | ||
34 | bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata; | |
35 | ||
36 | static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list); | |
37 | ||
38 | static int bootmem_debug; | |
39 | ||
40 | static int __init bootmem_debug_setup(char *buf) | |
41 | { | |
42 | bootmem_debug = 1; | |
43 | return 0; | |
44 | } | |
45 | early_param("bootmem_debug", bootmem_debug_setup); | |
46 | ||
47 | #define bdebug(fmt, args...) ({ \ | |
48 | if (unlikely(bootmem_debug)) \ | |
49 | printk(KERN_INFO \ | |
50 | "bootmem::%s " fmt, \ | |
51 | __FUNCTION__, ## args); \ | |
52 | }) | |
53 | ||
54 | static unsigned long __init bootmap_bytes(unsigned long pages) | |
55 | { | |
56 | unsigned long bytes = (pages + 7) / 8; | |
57 | ||
58 | return ALIGN(bytes, sizeof(long)); | |
59 | } | |
60 | ||
61 | /** | |
62 | * bootmem_bootmap_pages - calculate bitmap size in pages | |
63 | * @pages: number of pages the bitmap has to represent | |
64 | */ | |
65 | unsigned long __init bootmem_bootmap_pages(unsigned long pages) | |
66 | { | |
67 | unsigned long bytes = bootmap_bytes(pages); | |
68 | ||
69 | return PAGE_ALIGN(bytes) >> PAGE_SHIFT; | |
70 | } | |
71 | ||
72 | /* | |
73 | * link bdata in order | |
74 | */ | |
75 | static void __init link_bootmem(bootmem_data_t *bdata) | |
76 | { | |
77 | struct list_head *iter; | |
78 | ||
79 | list_for_each(iter, &bdata_list) { | |
80 | bootmem_data_t *ent; | |
81 | ||
82 | ent = list_entry(iter, bootmem_data_t, list); | |
83 | if (bdata->node_boot_start < ent->node_boot_start) | |
84 | break; | |
85 | } | |
86 | list_add_tail(&bdata->list, iter); | |
87 | } | |
88 | ||
89 | /* | |
90 | * Called once to set up the allocator itself. | |
91 | */ | |
92 | static unsigned long __init init_bootmem_core(bootmem_data_t *bdata, | |
93 | unsigned long mapstart, unsigned long start, unsigned long end) | |
94 | { | |
95 | unsigned long mapsize; | |
96 | ||
97 | mminit_validate_memmodel_limits(&start, &end); | |
98 | bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart)); | |
99 | bdata->node_boot_start = PFN_PHYS(start); | |
100 | bdata->node_low_pfn = end; | |
101 | link_bootmem(bdata); | |
102 | ||
103 | /* | |
104 | * Initially all pages are reserved - setup_arch() has to | |
105 | * register free RAM areas explicitly. | |
106 | */ | |
107 | mapsize = bootmap_bytes(end - start); | |
108 | memset(bdata->node_bootmem_map, 0xff, mapsize); | |
109 | ||
110 | bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n", | |
111 | bdata - bootmem_node_data, start, mapstart, end, mapsize); | |
112 | ||
113 | return mapsize; | |
114 | } | |
115 | ||
116 | /** | |
117 | * init_bootmem_node - register a node as boot memory | |
118 | * @pgdat: node to register | |
119 | * @freepfn: pfn where the bitmap for this node is to be placed | |
120 | * @startpfn: first pfn on the node | |
121 | * @endpfn: first pfn after the node | |
122 | * | |
123 | * Returns the number of bytes needed to hold the bitmap for this node. | |
124 | */ | |
125 | unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn, | |
126 | unsigned long startpfn, unsigned long endpfn) | |
127 | { | |
128 | return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn); | |
129 | } | |
130 | ||
131 | /** | |
132 | * init_bootmem - register boot memory | |
133 | * @start: pfn where the bitmap is to be placed | |
134 | * @pages: number of available physical pages | |
135 | * | |
136 | * Returns the number of bytes needed to hold the bitmap. | |
137 | */ | |
138 | unsigned long __init init_bootmem(unsigned long start, unsigned long pages) | |
139 | { | |
140 | max_low_pfn = pages; | |
141 | min_low_pfn = start; | |
142 | return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages); | |
143 | } | |
144 | ||
145 | static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) | |
146 | { | |
147 | int aligned; | |
148 | struct page *page; | |
149 | unsigned long start, end, pages, count = 0; | |
150 | ||
151 | if (!bdata->node_bootmem_map) | |
152 | return 0; | |
153 | ||
154 | start = PFN_DOWN(bdata->node_boot_start); | |
155 | end = bdata->node_low_pfn; | |
156 | ||
157 | /* | |
158 | * If the start is aligned to the machines wordsize, we might | |
159 | * be able to free pages in bulks of that order. | |
160 | */ | |
161 | aligned = !(start & (BITS_PER_LONG - 1)); | |
162 | ||
163 | bdebug("nid=%td start=%lx end=%lx aligned=%d\n", | |
164 | bdata - bootmem_node_data, start, end, aligned); | |
165 | ||
166 | while (start < end) { | |
167 | unsigned long *map, idx, vec; | |
168 | ||
169 | map = bdata->node_bootmem_map; | |
170 | idx = start - PFN_DOWN(bdata->node_boot_start); | |
171 | vec = ~map[idx / BITS_PER_LONG]; | |
172 | ||
173 | if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) { | |
174 | int order = ilog2(BITS_PER_LONG); | |
175 | ||
176 | __free_pages_bootmem(pfn_to_page(start), order); | |
177 | count += BITS_PER_LONG; | |
178 | } else { | |
179 | unsigned long off = 0; | |
180 | ||
181 | while (vec && off < BITS_PER_LONG) { | |
182 | if (vec & 1) { | |
183 | page = pfn_to_page(start + off); | |
184 | __free_pages_bootmem(page, 0); | |
185 | count++; | |
186 | } | |
187 | vec >>= 1; | |
188 | off++; | |
189 | } | |
190 | } | |
191 | start += BITS_PER_LONG; | |
192 | } | |
193 | ||
194 | page = virt_to_page(bdata->node_bootmem_map); | |
195 | pages = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start); | |
196 | pages = bootmem_bootmap_pages(pages); | |
197 | count += pages; | |
198 | while (pages--) | |
199 | __free_pages_bootmem(page++, 0); | |
200 | ||
201 | bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count); | |
202 | ||
203 | return count; | |
204 | } | |
205 | ||
206 | /** | |
207 | * free_all_bootmem_node - release a node's free pages to the buddy allocator | |
208 | * @pgdat: node to be released | |
209 | * | |
210 | * Returns the number of pages actually released. | |
211 | */ | |
212 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) | |
213 | { | |
214 | register_page_bootmem_info_node(pgdat); | |
215 | return free_all_bootmem_core(pgdat->bdata); | |
216 | } | |
217 | ||
218 | /** | |
219 | * free_all_bootmem - release free pages to the buddy allocator | |
220 | * | |
221 | * Returns the number of pages actually released. | |
222 | */ | |
223 | unsigned long __init free_all_bootmem(void) | |
224 | { | |
225 | return free_all_bootmem_core(NODE_DATA(0)->bdata); | |
226 | } | |
227 | ||
228 | static void __init __free(bootmem_data_t *bdata, | |
229 | unsigned long sidx, unsigned long eidx) | |
230 | { | |
231 | unsigned long idx; | |
232 | ||
233 | bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data, | |
234 | sidx + PFN_DOWN(bdata->node_boot_start), | |
235 | eidx + PFN_DOWN(bdata->node_boot_start)); | |
236 | ||
237 | if (bdata->hint_idx > sidx) | |
238 | bdata->hint_idx = sidx; | |
239 | ||
240 | for (idx = sidx; idx < eidx; idx++) | |
241 | if (!test_and_clear_bit(idx, bdata->node_bootmem_map)) | |
242 | BUG(); | |
243 | } | |
244 | ||
245 | static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx, | |
246 | unsigned long eidx, int flags) | |
247 | { | |
248 | unsigned long idx; | |
249 | int exclusive = flags & BOOTMEM_EXCLUSIVE; | |
250 | ||
251 | bdebug("nid=%td start=%lx end=%lx flags=%x\n", | |
252 | bdata - bootmem_node_data, | |
253 | sidx + PFN_DOWN(bdata->node_boot_start), | |
254 | eidx + PFN_DOWN(bdata->node_boot_start), | |
255 | flags); | |
256 | ||
257 | for (idx = sidx; idx < eidx; idx++) | |
258 | if (test_and_set_bit(idx, bdata->node_bootmem_map)) { | |
259 | if (exclusive) { | |
260 | __free(bdata, sidx, idx); | |
261 | return -EBUSY; | |
262 | } | |
263 | bdebug("silent double reserve of PFN %lx\n", | |
264 | idx + PFN_DOWN(bdata->node_boot_start)); | |
265 | } | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static int __init mark_bootmem_node(bootmem_data_t *bdata, | |
270 | unsigned long start, unsigned long end, | |
271 | int reserve, int flags) | |
272 | { | |
273 | unsigned long sidx, eidx; | |
274 | ||
275 | bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n", | |
276 | bdata - bootmem_node_data, start, end, reserve, flags); | |
277 | ||
278 | BUG_ON(start < PFN_DOWN(bdata->node_boot_start)); | |
279 | BUG_ON(end > bdata->node_low_pfn); | |
280 | ||
281 | sidx = start - PFN_DOWN(bdata->node_boot_start); | |
282 | eidx = end - PFN_DOWN(bdata->node_boot_start); | |
283 | ||
284 | if (reserve) | |
285 | return __reserve(bdata, sidx, eidx, flags); | |
286 | else | |
287 | __free(bdata, sidx, eidx); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static int __init mark_bootmem(unsigned long start, unsigned long end, | |
292 | int reserve, int flags) | |
293 | { | |
294 | unsigned long pos; | |
295 | bootmem_data_t *bdata; | |
296 | ||
297 | pos = start; | |
298 | list_for_each_entry(bdata, &bdata_list, list) { | |
299 | int err; | |
300 | unsigned long max; | |
301 | ||
302 | if (pos < PFN_DOWN(bdata->node_boot_start)) { | |
303 | BUG_ON(pos != start); | |
304 | continue; | |
305 | } | |
306 | ||
307 | max = min(bdata->node_low_pfn, end); | |
308 | ||
309 | err = mark_bootmem_node(bdata, pos, max, reserve, flags); | |
310 | if (reserve && err) { | |
311 | mark_bootmem(start, pos, 0, 0); | |
312 | return err; | |
313 | } | |
314 | ||
315 | if (max == end) | |
316 | return 0; | |
317 | pos = bdata->node_low_pfn; | |
318 | } | |
319 | BUG(); | |
320 | } | |
321 | ||
322 | /** | |
323 | * free_bootmem_node - mark a page range as usable | |
324 | * @pgdat: node the range resides on | |
325 | * @physaddr: starting address of the range | |
326 | * @size: size of the range in bytes | |
327 | * | |
328 | * Partial pages will be considered reserved and left as they are. | |
329 | * | |
330 | * The range must reside completely on the specified node. | |
331 | */ | |
332 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, | |
333 | unsigned long size) | |
334 | { | |
335 | unsigned long start, end; | |
336 | ||
337 | start = PFN_UP(physaddr); | |
338 | end = PFN_DOWN(physaddr + size); | |
339 | ||
340 | mark_bootmem_node(pgdat->bdata, start, end, 0, 0); | |
341 | } | |
342 | ||
343 | /** | |
344 | * free_bootmem - mark a page range as usable | |
345 | * @addr: starting address of the range | |
346 | * @size: size of the range in bytes | |
347 | * | |
348 | * Partial pages will be considered reserved and left as they are. | |
349 | * | |
350 | * The range must be contiguous but may span node boundaries. | |
351 | */ | |
352 | void __init free_bootmem(unsigned long addr, unsigned long size) | |
353 | { | |
354 | unsigned long start, end; | |
355 | ||
356 | start = PFN_UP(addr); | |
357 | end = PFN_DOWN(addr + size); | |
358 | ||
359 | mark_bootmem(start, end, 0, 0); | |
360 | } | |
361 | ||
362 | /** | |
363 | * reserve_bootmem_node - mark a page range as reserved | |
364 | * @pgdat: node the range resides on | |
365 | * @physaddr: starting address of the range | |
366 | * @size: size of the range in bytes | |
367 | * @flags: reservation flags (see linux/bootmem.h) | |
368 | * | |
369 | * Partial pages will be reserved. | |
370 | * | |
371 | * The range must reside completely on the specified node. | |
372 | */ | |
373 | int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, | |
374 | unsigned long size, int flags) | |
375 | { | |
376 | unsigned long start, end; | |
377 | ||
378 | start = PFN_DOWN(physaddr); | |
379 | end = PFN_UP(physaddr + size); | |
380 | ||
381 | return mark_bootmem_node(pgdat->bdata, start, end, 1, flags); | |
382 | } | |
383 | ||
384 | #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE | |
385 | /** | |
386 | * reserve_bootmem - mark a page range as usable | |
387 | * @addr: starting address of the range | |
388 | * @size: size of the range in bytes | |
389 | * @flags: reservation flags (see linux/bootmem.h) | |
390 | * | |
391 | * Partial pages will be reserved. | |
392 | * | |
393 | * The range must be contiguous but may span node boundaries. | |
394 | */ | |
395 | int __init reserve_bootmem(unsigned long addr, unsigned long size, | |
396 | int flags) | |
397 | { | |
398 | unsigned long start, end; | |
399 | ||
400 | start = PFN_DOWN(addr); | |
401 | end = PFN_UP(addr + size); | |
402 | ||
403 | return mark_bootmem(start, end, 1, flags); | |
404 | } | |
405 | #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */ | |
406 | ||
407 | static void * __init alloc_bootmem_core(struct bootmem_data *bdata, | |
408 | unsigned long size, unsigned long align, | |
409 | unsigned long goal, unsigned long limit) | |
410 | { | |
411 | unsigned long fallback = 0; | |
412 | unsigned long min, max, start, sidx, midx, step; | |
413 | ||
414 | BUG_ON(!size); | |
415 | BUG_ON(align & (align - 1)); | |
416 | BUG_ON(limit && goal + size > limit); | |
417 | ||
418 | if (!bdata->node_bootmem_map) | |
419 | return NULL; | |
420 | ||
421 | bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n", | |
422 | bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT, | |
423 | align, goal, limit); | |
424 | ||
425 | min = PFN_DOWN(bdata->node_boot_start); | |
426 | max = bdata->node_low_pfn; | |
427 | ||
428 | goal >>= PAGE_SHIFT; | |
429 | limit >>= PAGE_SHIFT; | |
430 | ||
431 | if (limit && max > limit) | |
432 | max = limit; | |
433 | if (max <= min) | |
434 | return NULL; | |
435 | ||
436 | step = max(align >> PAGE_SHIFT, 1UL); | |
437 | ||
438 | if (goal && min < goal && goal < max) | |
439 | start = ALIGN(goal, step); | |
440 | else | |
441 | start = ALIGN(min, step); | |
442 | ||
443 | sidx = start - PFN_DOWN(bdata->node_boot_start); | |
444 | midx = max - PFN_DOWN(bdata->node_boot_start); | |
445 | ||
446 | if (bdata->hint_idx > sidx) { | |
447 | /* | |
448 | * Handle the valid case of sidx being zero and still | |
449 | * catch the fallback below. | |
450 | */ | |
451 | fallback = sidx + 1; | |
452 | sidx = ALIGN(bdata->hint_idx, step); | |
453 | } | |
454 | ||
455 | while (1) { | |
456 | int merge; | |
457 | void *region; | |
458 | unsigned long eidx, i, start_off, end_off; | |
459 | find_block: | |
460 | sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx); | |
461 | sidx = ALIGN(sidx, step); | |
462 | eidx = sidx + PFN_UP(size); | |
463 | ||
464 | if (sidx >= midx || eidx > midx) | |
465 | break; | |
466 | ||
467 | for (i = sidx; i < eidx; i++) | |
468 | if (test_bit(i, bdata->node_bootmem_map)) { | |
469 | sidx = ALIGN(i, step); | |
470 | if (sidx == i) | |
471 | sidx += step; | |
472 | goto find_block; | |
473 | } | |
474 | ||
475 | if (bdata->last_end_off && | |
476 | PFN_DOWN(bdata->last_end_off) + 1 == sidx) | |
477 | start_off = ALIGN(bdata->last_end_off, align); | |
478 | else | |
479 | start_off = PFN_PHYS(sidx); | |
480 | ||
481 | merge = PFN_DOWN(start_off) < sidx; | |
482 | end_off = start_off + size; | |
483 | ||
484 | bdata->last_end_off = end_off; | |
485 | bdata->hint_idx = PFN_UP(end_off); | |
486 | ||
487 | /* | |
488 | * Reserve the area now: | |
489 | */ | |
490 | if (__reserve(bdata, PFN_DOWN(start_off) + merge, | |
491 | PFN_UP(end_off), BOOTMEM_EXCLUSIVE)) | |
492 | BUG(); | |
493 | ||
494 | region = phys_to_virt(bdata->node_boot_start + start_off); | |
495 | memset(region, 0, size); | |
496 | return region; | |
497 | } | |
498 | ||
499 | if (fallback) { | |
500 | sidx = ALIGN(fallback - 1, step); | |
501 | fallback = 0; | |
502 | goto find_block; | |
503 | } | |
504 | ||
505 | return NULL; | |
506 | } | |
507 | ||
508 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, | |
509 | unsigned long align, | |
510 | unsigned long goal, | |
511 | unsigned long limit) | |
512 | { | |
513 | bootmem_data_t *bdata; | |
514 | ||
515 | restart: | |
516 | list_for_each_entry(bdata, &bdata_list, list) { | |
517 | void *region; | |
518 | ||
519 | if (goal && bdata->node_low_pfn <= PFN_DOWN(goal)) | |
520 | continue; | |
521 | if (limit && bdata->node_boot_start >= limit) | |
522 | break; | |
523 | ||
524 | region = alloc_bootmem_core(bdata, size, align, goal, limit); | |
525 | if (region) | |
526 | return region; | |
527 | } | |
528 | ||
529 | if (goal) { | |
530 | goal = 0; | |
531 | goto restart; | |
532 | } | |
533 | ||
534 | return NULL; | |
535 | } | |
536 | ||
537 | /** | |
538 | * __alloc_bootmem_nopanic - allocate boot memory without panicking | |
539 | * @size: size of the request in bytes | |
540 | * @align: alignment of the region | |
541 | * @goal: preferred starting address of the region | |
542 | * | |
543 | * The goal is dropped if it can not be satisfied and the allocation will | |
544 | * fall back to memory below @goal. | |
545 | * | |
546 | * Allocation may happen on any node in the system. | |
547 | * | |
548 | * Returns NULL on failure. | |
549 | */ | |
550 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, | |
551 | unsigned long goal) | |
552 | { | |
553 | return ___alloc_bootmem_nopanic(size, align, goal, 0); | |
554 | } | |
555 | ||
556 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, | |
557 | unsigned long goal, unsigned long limit) | |
558 | { | |
559 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); | |
560 | ||
561 | if (mem) | |
562 | return mem; | |
563 | /* | |
564 | * Whoops, we cannot satisfy the allocation request. | |
565 | */ | |
566 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); | |
567 | panic("Out of memory"); | |
568 | return NULL; | |
569 | } | |
570 | ||
571 | /** | |
572 | * __alloc_bootmem - allocate boot memory | |
573 | * @size: size of the request in bytes | |
574 | * @align: alignment of the region | |
575 | * @goal: preferred starting address of the region | |
576 | * | |
577 | * The goal is dropped if it can not be satisfied and the allocation will | |
578 | * fall back to memory below @goal. | |
579 | * | |
580 | * Allocation may happen on any node in the system. | |
581 | * | |
582 | * The function panics if the request can not be satisfied. | |
583 | */ | |
584 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, | |
585 | unsigned long goal) | |
586 | { | |
587 | return ___alloc_bootmem(size, align, goal, 0); | |
588 | } | |
589 | ||
590 | static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata, | |
591 | unsigned long size, unsigned long align, | |
592 | unsigned long goal, unsigned long limit) | |
593 | { | |
594 | void *ptr; | |
595 | ||
596 | ptr = alloc_bootmem_core(bdata, size, align, goal, limit); | |
597 | if (ptr) | |
598 | return ptr; | |
599 | ||
600 | return ___alloc_bootmem(size, align, goal, limit); | |
601 | } | |
602 | ||
603 | /** | |
604 | * __alloc_bootmem_node - allocate boot memory from a specific node | |
605 | * @pgdat: node to allocate from | |
606 | * @size: size of the request in bytes | |
607 | * @align: alignment of the region | |
608 | * @goal: preferred starting address of the region | |
609 | * | |
610 | * The goal is dropped if it can not be satisfied and the allocation will | |
611 | * fall back to memory below @goal. | |
612 | * | |
613 | * Allocation may fall back to any node in the system if the specified node | |
614 | * can not hold the requested memory. | |
615 | * | |
616 | * The function panics if the request can not be satisfied. | |
617 | */ | |
618 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, | |
619 | unsigned long align, unsigned long goal) | |
620 | { | |
621 | return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0); | |
622 | } | |
623 | ||
624 | #ifdef CONFIG_SPARSEMEM | |
625 | /** | |
626 | * alloc_bootmem_section - allocate boot memory from a specific section | |
627 | * @size: size of the request in bytes | |
628 | * @section_nr: sparse map section to allocate from | |
629 | * | |
630 | * Return NULL on failure. | |
631 | */ | |
632 | void * __init alloc_bootmem_section(unsigned long size, | |
633 | unsigned long section_nr) | |
634 | { | |
635 | bootmem_data_t *bdata; | |
636 | unsigned long pfn, goal, limit; | |
637 | ||
638 | pfn = section_nr_to_pfn(section_nr); | |
639 | goal = pfn << PAGE_SHIFT; | |
640 | limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT; | |
641 | bdata = &bootmem_node_data[early_pfn_to_nid(pfn)]; | |
642 | ||
643 | return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit); | |
644 | } | |
645 | #endif | |
646 | ||
647 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, | |
648 | unsigned long align, unsigned long goal) | |
649 | { | |
650 | void *ptr; | |
651 | ||
652 | ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0); | |
653 | if (ptr) | |
654 | return ptr; | |
655 | ||
656 | return __alloc_bootmem_nopanic(size, align, goal); | |
657 | } | |
658 | ||
659 | #ifndef ARCH_LOW_ADDRESS_LIMIT | |
660 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL | |
661 | #endif | |
662 | ||
663 | /** | |
664 | * __alloc_bootmem_low - allocate low boot memory | |
665 | * @size: size of the request in bytes | |
666 | * @align: alignment of the region | |
667 | * @goal: preferred starting address of the region | |
668 | * | |
669 | * The goal is dropped if it can not be satisfied and the allocation will | |
670 | * fall back to memory below @goal. | |
671 | * | |
672 | * Allocation may happen on any node in the system. | |
673 | * | |
674 | * The function panics if the request can not be satisfied. | |
675 | */ | |
676 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, | |
677 | unsigned long goal) | |
678 | { | |
679 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); | |
680 | } | |
681 | ||
682 | /** | |
683 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node | |
684 | * @pgdat: node to allocate from | |
685 | * @size: size of the request in bytes | |
686 | * @align: alignment of the region | |
687 | * @goal: preferred starting address of the region | |
688 | * | |
689 | * The goal is dropped if it can not be satisfied and the allocation will | |
690 | * fall back to memory below @goal. | |
691 | * | |
692 | * Allocation may fall back to any node in the system if the specified node | |
693 | * can not hold the requested memory. | |
694 | * | |
695 | * The function panics if the request can not be satisfied. | |
696 | */ | |
697 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, | |
698 | unsigned long align, unsigned long goal) | |
699 | { | |
700 | return ___alloc_bootmem_node(pgdat->bdata, size, align, | |
701 | goal, ARCH_LOW_ADDRESS_LIMIT); | |
702 | } |