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1 | #include <linux/gfp.h> | |
2 | #include <linux/initrd.h> | |
3 | #include <linux/ioport.h> | |
4 | #include <linux/swap.h> | |
5 | #include <linux/memblock.h> | |
6 | #include <linux/bootmem.h> /* for max_low_pfn */ | |
7 | ||
8 | #include <asm/cacheflush.h> | |
9 | #include <asm/e820.h> | |
10 | #include <asm/init.h> | |
11 | #include <asm/page.h> | |
12 | #include <asm/page_types.h> | |
13 | #include <asm/sections.h> | |
14 | #include <asm/setup.h> | |
15 | #include <asm/tlbflush.h> | |
16 | #include <asm/tlb.h> | |
17 | #include <asm/proto.h> | |
18 | #include <asm/dma.h> /* for MAX_DMA_PFN */ | |
19 | ||
20 | #include "mm_internal.h" | |
21 | ||
22 | static unsigned long __initdata pgt_buf_start; | |
23 | static unsigned long __initdata pgt_buf_end; | |
24 | static unsigned long __initdata pgt_buf_top; | |
25 | ||
26 | static unsigned long min_pfn_mapped; | |
27 | ||
28 | /* | |
29 | * Pages returned are already directly mapped. | |
30 | * | |
31 | * Changing that is likely to break Xen, see commit: | |
32 | * | |
33 | * 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve | |
34 | * | |
35 | * for detailed information. | |
36 | */ | |
37 | __ref void *alloc_low_pages(unsigned int num) | |
38 | { | |
39 | unsigned long pfn; | |
40 | int i; | |
41 | ||
42 | #ifdef CONFIG_X86_64 | |
43 | if (after_bootmem) { | |
44 | unsigned int order; | |
45 | ||
46 | order = get_order((unsigned long)num << PAGE_SHIFT); | |
47 | return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK | | |
48 | __GFP_ZERO, order); | |
49 | } | |
50 | #endif | |
51 | ||
52 | if ((pgt_buf_end + num) >= pgt_buf_top) { | |
53 | unsigned long ret; | |
54 | if (min_pfn_mapped >= max_pfn_mapped) | |
55 | panic("alloc_low_page: ran out of memory"); | |
56 | ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT, | |
57 | max_pfn_mapped << PAGE_SHIFT, | |
58 | PAGE_SIZE * num , PAGE_SIZE); | |
59 | if (!ret) | |
60 | panic("alloc_low_page: can not alloc memory"); | |
61 | memblock_reserve(ret, PAGE_SIZE * num); | |
62 | pfn = ret >> PAGE_SHIFT; | |
63 | } else { | |
64 | pfn = pgt_buf_end; | |
65 | pgt_buf_end += num; | |
66 | } | |
67 | ||
68 | for (i = 0; i < num; i++) { | |
69 | void *adr; | |
70 | ||
71 | adr = __va((pfn + i) << PAGE_SHIFT); | |
72 | clear_page(adr); | |
73 | } | |
74 | ||
75 | return __va(pfn << PAGE_SHIFT); | |
76 | } | |
77 | ||
78 | /* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */ | |
79 | #define INIT_PGT_BUF_SIZE (5 * PAGE_SIZE) | |
80 | RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE); | |
81 | void __init early_alloc_pgt_buf(void) | |
82 | { | |
83 | unsigned long tables = INIT_PGT_BUF_SIZE; | |
84 | phys_addr_t base; | |
85 | ||
86 | base = __pa(extend_brk(tables, PAGE_SIZE)); | |
87 | ||
88 | pgt_buf_start = base >> PAGE_SHIFT; | |
89 | pgt_buf_end = pgt_buf_start; | |
90 | pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); | |
91 | } | |
92 | ||
93 | int after_bootmem; | |
94 | ||
95 | int direct_gbpages | |
96 | #ifdef CONFIG_DIRECT_GBPAGES | |
97 | = 1 | |
98 | #endif | |
99 | ; | |
100 | ||
101 | static void __init init_gbpages(void) | |
102 | { | |
103 | #ifdef CONFIG_X86_64 | |
104 | if (direct_gbpages && cpu_has_gbpages) | |
105 | printk(KERN_INFO "Using GB pages for direct mapping\n"); | |
106 | else | |
107 | direct_gbpages = 0; | |
108 | #endif | |
109 | } | |
110 | ||
111 | struct map_range { | |
112 | unsigned long start; | |
113 | unsigned long end; | |
114 | unsigned page_size_mask; | |
115 | }; | |
116 | ||
117 | static int page_size_mask; | |
118 | ||
119 | static void __init probe_page_size_mask(void) | |
120 | { | |
121 | init_gbpages(); | |
122 | ||
123 | #if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK) | |
124 | /* | |
125 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
126 | * This will simplify cpa(), which otherwise needs to support splitting | |
127 | * large pages into small in interrupt context, etc. | |
128 | */ | |
129 | if (direct_gbpages) | |
130 | page_size_mask |= 1 << PG_LEVEL_1G; | |
131 | if (cpu_has_pse) | |
132 | page_size_mask |= 1 << PG_LEVEL_2M; | |
133 | #endif | |
134 | ||
135 | /* Enable PSE if available */ | |
136 | if (cpu_has_pse) | |
137 | set_in_cr4(X86_CR4_PSE); | |
138 | ||
139 | /* Enable PGE if available */ | |
140 | if (cpu_has_pge) { | |
141 | set_in_cr4(X86_CR4_PGE); | |
142 | __supported_pte_mask |= _PAGE_GLOBAL; | |
143 | } | |
144 | } | |
145 | ||
146 | #ifdef CONFIG_X86_32 | |
147 | #define NR_RANGE_MR 3 | |
148 | #else /* CONFIG_X86_64 */ | |
149 | #define NR_RANGE_MR 5 | |
150 | #endif | |
151 | ||
152 | static int __meminit save_mr(struct map_range *mr, int nr_range, | |
153 | unsigned long start_pfn, unsigned long end_pfn, | |
154 | unsigned long page_size_mask) | |
155 | { | |
156 | if (start_pfn < end_pfn) { | |
157 | if (nr_range >= NR_RANGE_MR) | |
158 | panic("run out of range for init_memory_mapping\n"); | |
159 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
160 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
161 | mr[nr_range].page_size_mask = page_size_mask; | |
162 | nr_range++; | |
163 | } | |
164 | ||
165 | return nr_range; | |
166 | } | |
167 | ||
168 | /* | |
169 | * adjust the page_size_mask for small range to go with | |
170 | * big page size instead small one if nearby are ram too. | |
171 | */ | |
172 | static void __init_refok adjust_range_page_size_mask(struct map_range *mr, | |
173 | int nr_range) | |
174 | { | |
175 | int i; | |
176 | ||
177 | for (i = 0; i < nr_range; i++) { | |
178 | if ((page_size_mask & (1<<PG_LEVEL_2M)) && | |
179 | !(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) { | |
180 | unsigned long start = round_down(mr[i].start, PMD_SIZE); | |
181 | unsigned long end = round_up(mr[i].end, PMD_SIZE); | |
182 | ||
183 | #ifdef CONFIG_X86_32 | |
184 | if ((end >> PAGE_SHIFT) > max_low_pfn) | |
185 | continue; | |
186 | #endif | |
187 | ||
188 | if (memblock_is_region_memory(start, end - start)) | |
189 | mr[i].page_size_mask |= 1<<PG_LEVEL_2M; | |
190 | } | |
191 | if ((page_size_mask & (1<<PG_LEVEL_1G)) && | |
192 | !(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) { | |
193 | unsigned long start = round_down(mr[i].start, PUD_SIZE); | |
194 | unsigned long end = round_up(mr[i].end, PUD_SIZE); | |
195 | ||
196 | if (memblock_is_region_memory(start, end - start)) | |
197 | mr[i].page_size_mask |= 1<<PG_LEVEL_1G; | |
198 | } | |
199 | } | |
200 | } | |
201 | ||
202 | static int __meminit split_mem_range(struct map_range *mr, int nr_range, | |
203 | unsigned long start, | |
204 | unsigned long end) | |
205 | { | |
206 | unsigned long start_pfn, end_pfn; | |
207 | unsigned long pos; | |
208 | int i; | |
209 | ||
210 | /* head if not big page alignment ? */ | |
211 | start_pfn = start >> PAGE_SHIFT; | |
212 | pos = start_pfn << PAGE_SHIFT; | |
213 | #ifdef CONFIG_X86_32 | |
214 | /* | |
215 | * Don't use a large page for the first 2/4MB of memory | |
216 | * because there are often fixed size MTRRs in there | |
217 | * and overlapping MTRRs into large pages can cause | |
218 | * slowdowns. | |
219 | */ | |
220 | if (pos == 0) | |
221 | end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); | |
222 | else | |
223 | end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
224 | << (PMD_SHIFT - PAGE_SHIFT); | |
225 | #else /* CONFIG_X86_64 */ | |
226 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
227 | << (PMD_SHIFT - PAGE_SHIFT); | |
228 | #endif | |
229 | if (end_pfn > (end >> PAGE_SHIFT)) | |
230 | end_pfn = end >> PAGE_SHIFT; | |
231 | if (start_pfn < end_pfn) { | |
232 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
233 | pos = end_pfn << PAGE_SHIFT; | |
234 | } | |
235 | ||
236 | /* big page (2M) range */ | |
237 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
238 | << (PMD_SHIFT - PAGE_SHIFT); | |
239 | #ifdef CONFIG_X86_32 | |
240 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
241 | #else /* CONFIG_X86_64 */ | |
242 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
243 | << (PUD_SHIFT - PAGE_SHIFT); | |
244 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) | |
245 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
246 | #endif | |
247 | ||
248 | if (start_pfn < end_pfn) { | |
249 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
250 | page_size_mask & (1<<PG_LEVEL_2M)); | |
251 | pos = end_pfn << PAGE_SHIFT; | |
252 | } | |
253 | ||
254 | #ifdef CONFIG_X86_64 | |
255 | /* big page (1G) range */ | |
256 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
257 | << (PUD_SHIFT - PAGE_SHIFT); | |
258 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
259 | if (start_pfn < end_pfn) { | |
260 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
261 | page_size_mask & | |
262 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
263 | pos = end_pfn << PAGE_SHIFT; | |
264 | } | |
265 | ||
266 | /* tail is not big page (1G) alignment */ | |
267 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
268 | << (PMD_SHIFT - PAGE_SHIFT); | |
269 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
270 | if (start_pfn < end_pfn) { | |
271 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
272 | page_size_mask & (1<<PG_LEVEL_2M)); | |
273 | pos = end_pfn << PAGE_SHIFT; | |
274 | } | |
275 | #endif | |
276 | ||
277 | /* tail is not big page (2M) alignment */ | |
278 | start_pfn = pos>>PAGE_SHIFT; | |
279 | end_pfn = end>>PAGE_SHIFT; | |
280 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
281 | ||
282 | /* try to merge same page size and continuous */ | |
283 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
284 | unsigned long old_start; | |
285 | if (mr[i].end != mr[i+1].start || | |
286 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
287 | continue; | |
288 | /* move it */ | |
289 | old_start = mr[i].start; | |
290 | memmove(&mr[i], &mr[i+1], | |
291 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
292 | mr[i--].start = old_start; | |
293 | nr_range--; | |
294 | } | |
295 | ||
296 | if (!after_bootmem) | |
297 | adjust_range_page_size_mask(mr, nr_range); | |
298 | ||
299 | for (i = 0; i < nr_range; i++) | |
300 | printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n", | |
301 | mr[i].start, mr[i].end - 1, | |
302 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( | |
303 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
304 | ||
305 | return nr_range; | |
306 | } | |
307 | ||
308 | static struct range pfn_mapped[E820_X_MAX]; | |
309 | static int nr_pfn_mapped; | |
310 | ||
311 | static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
312 | { | |
313 | nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX, | |
314 | nr_pfn_mapped, start_pfn, end_pfn); | |
315 | nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX); | |
316 | ||
317 | max_pfn_mapped = max(max_pfn_mapped, end_pfn); | |
318 | ||
319 | if (start_pfn < (1UL<<(32-PAGE_SHIFT))) | |
320 | max_low_pfn_mapped = max(max_low_pfn_mapped, | |
321 | min(end_pfn, 1UL<<(32-PAGE_SHIFT))); | |
322 | } | |
323 | ||
324 | bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
325 | { | |
326 | int i; | |
327 | ||
328 | for (i = 0; i < nr_pfn_mapped; i++) | |
329 | if ((start_pfn >= pfn_mapped[i].start) && | |
330 | (end_pfn <= pfn_mapped[i].end)) | |
331 | return true; | |
332 | ||
333 | return false; | |
334 | } | |
335 | ||
336 | /* | |
337 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
338 | * This runs before bootmem is initialized and gets pages directly from | |
339 | * the physical memory. To access them they are temporarily mapped. | |
340 | */ | |
341 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
342 | unsigned long end) | |
343 | { | |
344 | struct map_range mr[NR_RANGE_MR]; | |
345 | unsigned long ret = 0; | |
346 | int nr_range, i; | |
347 | ||
348 | pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n", | |
349 | start, end - 1); | |
350 | ||
351 | memset(mr, 0, sizeof(mr)); | |
352 | nr_range = split_mem_range(mr, 0, start, end); | |
353 | ||
354 | for (i = 0; i < nr_range; i++) | |
355 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
356 | mr[i].page_size_mask); | |
357 | ||
358 | add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT); | |
359 | ||
360 | return ret >> PAGE_SHIFT; | |
361 | } | |
362 | ||
363 | /* | |
364 | * would have hole in the middle or ends, and only ram parts will be mapped. | |
365 | */ | |
366 | static unsigned long __init init_range_memory_mapping( | |
367 | unsigned long range_start, | |
368 | unsigned long range_end) | |
369 | { | |
370 | unsigned long start_pfn, end_pfn; | |
371 | unsigned long mapped_ram_size = 0; | |
372 | int i; | |
373 | ||
374 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { | |
375 | u64 start = (u64)start_pfn << PAGE_SHIFT; | |
376 | u64 end = (u64)end_pfn << PAGE_SHIFT; | |
377 | ||
378 | if (end <= range_start) | |
379 | continue; | |
380 | ||
381 | if (start < range_start) | |
382 | start = range_start; | |
383 | ||
384 | if (start >= range_end) | |
385 | continue; | |
386 | ||
387 | if (end > range_end) | |
388 | end = range_end; | |
389 | ||
390 | init_memory_mapping(start, end); | |
391 | ||
392 | mapped_ram_size += end - start; | |
393 | } | |
394 | ||
395 | return mapped_ram_size; | |
396 | } | |
397 | ||
398 | /* (PUD_SHIFT-PMD_SHIFT)/2 */ | |
399 | #define STEP_SIZE_SHIFT 5 | |
400 | void __init init_mem_mapping(void) | |
401 | { | |
402 | unsigned long end, real_end, start, last_start; | |
403 | unsigned long step_size; | |
404 | unsigned long addr; | |
405 | unsigned long mapped_ram_size = 0; | |
406 | unsigned long new_mapped_ram_size; | |
407 | ||
408 | probe_page_size_mask(); | |
409 | ||
410 | #ifdef CONFIG_X86_64 | |
411 | end = max_pfn << PAGE_SHIFT; | |
412 | #else | |
413 | end = max_low_pfn << PAGE_SHIFT; | |
414 | #endif | |
415 | ||
416 | /* the ISA range is always mapped regardless of memory holes */ | |
417 | init_memory_mapping(0, ISA_END_ADDRESS); | |
418 | ||
419 | /* xen has big range in reserved near end of ram, skip it at first */ | |
420 | addr = memblock_find_in_range(ISA_END_ADDRESS, end, PMD_SIZE, | |
421 | PAGE_SIZE); | |
422 | real_end = addr + PMD_SIZE; | |
423 | ||
424 | /* step_size need to be small so pgt_buf from BRK could cover it */ | |
425 | step_size = PMD_SIZE; | |
426 | max_pfn_mapped = 0; /* will get exact value next */ | |
427 | min_pfn_mapped = real_end >> PAGE_SHIFT; | |
428 | last_start = start = real_end; | |
429 | while (last_start > ISA_END_ADDRESS) { | |
430 | if (last_start > step_size) { | |
431 | start = round_down(last_start - 1, step_size); | |
432 | if (start < ISA_END_ADDRESS) | |
433 | start = ISA_END_ADDRESS; | |
434 | } else | |
435 | start = ISA_END_ADDRESS; | |
436 | new_mapped_ram_size = init_range_memory_mapping(start, | |
437 | last_start); | |
438 | last_start = start; | |
439 | min_pfn_mapped = last_start >> PAGE_SHIFT; | |
440 | /* only increase step_size after big range get mapped */ | |
441 | if (new_mapped_ram_size > mapped_ram_size) | |
442 | step_size <<= STEP_SIZE_SHIFT; | |
443 | mapped_ram_size += new_mapped_ram_size; | |
444 | } | |
445 | ||
446 | if (real_end < end) | |
447 | init_range_memory_mapping(real_end, end); | |
448 | ||
449 | #ifdef CONFIG_X86_64 | |
450 | if (max_pfn > max_low_pfn) { | |
451 | /* can we preseve max_low_pfn ?*/ | |
452 | max_low_pfn = max_pfn; | |
453 | } | |
454 | #else | |
455 | early_ioremap_page_table_range_init(); | |
456 | load_cr3(swapper_pg_dir); | |
457 | __flush_tlb_all(); | |
458 | #endif | |
459 | ||
460 | early_memtest(0, max_pfn_mapped << PAGE_SHIFT); | |
461 | } | |
462 | ||
463 | /* | |
464 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
465 | * is valid. The argument is a physical page number. | |
466 | * | |
467 | * | |
468 | * On x86, access has to be given to the first megabyte of ram because that area | |
469 | * contains bios code and data regions used by X and dosemu and similar apps. | |
470 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
471 | * mmio resources as well as potential bios/acpi data regions. | |
472 | */ | |
473 | int devmem_is_allowed(unsigned long pagenr) | |
474 | { | |
475 | if (pagenr < 256) | |
476 | return 1; | |
477 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
478 | return 0; | |
479 | if (!page_is_ram(pagenr)) | |
480 | return 1; | |
481 | return 0; | |
482 | } | |
483 | ||
484 | void free_init_pages(char *what, unsigned long begin, unsigned long end) | |
485 | { | |
486 | unsigned long addr; | |
487 | unsigned long begin_aligned, end_aligned; | |
488 | ||
489 | /* Make sure boundaries are page aligned */ | |
490 | begin_aligned = PAGE_ALIGN(begin); | |
491 | end_aligned = end & PAGE_MASK; | |
492 | ||
493 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
494 | begin = begin_aligned; | |
495 | end = end_aligned; | |
496 | } | |
497 | ||
498 | if (begin >= end) | |
499 | return; | |
500 | ||
501 | addr = begin; | |
502 | ||
503 | /* | |
504 | * If debugging page accesses then do not free this memory but | |
505 | * mark them not present - any buggy init-section access will | |
506 | * create a kernel page fault: | |
507 | */ | |
508 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
509 | printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n", | |
510 | begin, end - 1); | |
511 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); | |
512 | #else | |
513 | /* | |
514 | * We just marked the kernel text read only above, now that | |
515 | * we are going to free part of that, we need to make that | |
516 | * writeable and non-executable first. | |
517 | */ | |
518 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); | |
519 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); | |
520 | ||
521 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
522 | ||
523 | for (; addr < end; addr += PAGE_SIZE) { | |
524 | ClearPageReserved(virt_to_page(addr)); | |
525 | init_page_count(virt_to_page(addr)); | |
526 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); | |
527 | free_page(addr); | |
528 | totalram_pages++; | |
529 | } | |
530 | #endif | |
531 | } | |
532 | ||
533 | void free_initmem(void) | |
534 | { | |
535 | free_init_pages("unused kernel memory", | |
536 | (unsigned long)(&__init_begin), | |
537 | (unsigned long)(&__init_end)); | |
538 | } | |
539 | ||
540 | #ifdef CONFIG_BLK_DEV_INITRD | |
541 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
542 | { | |
543 | /* | |
544 | * end could be not aligned, and We can not align that, | |
545 | * decompresser could be confused by aligned initrd_end | |
546 | * We already reserve the end partial page before in | |
547 | * - i386_start_kernel() | |
548 | * - x86_64_start_kernel() | |
549 | * - relocate_initrd() | |
550 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
551 | */ | |
552 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
553 | } | |
554 | #endif | |
555 | ||
556 | void __init zone_sizes_init(void) | |
557 | { | |
558 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
559 | ||
560 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
561 | ||
562 | #ifdef CONFIG_ZONE_DMA | |
563 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
564 | #endif | |
565 | #ifdef CONFIG_ZONE_DMA32 | |
566 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
567 | #endif | |
568 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
569 | #ifdef CONFIG_HIGHMEM | |
570 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; | |
571 | #endif | |
572 | ||
573 | free_area_init_nodes(max_zone_pfns); | |
574 | } | |
575 |