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Commit | Line | Data |
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5a0e3ad6 | 1 | #include <linux/gfp.h> |
2c1b284e | 2 | #include <linux/initrd.h> |
540aca06 | 3 | #include <linux/ioport.h> |
e5b2bb55 | 4 | #include <linux/swap.h> |
a9ce6bc1 | 5 | #include <linux/memblock.h> |
17623915 | 6 | #include <linux/bootmem.h> /* for max_low_pfn */ |
540aca06 | 7 | |
e5b2bb55 | 8 | #include <asm/cacheflush.h> |
f765090a | 9 | #include <asm/e820.h> |
4fcb2083 | 10 | #include <asm/init.h> |
e5b2bb55 | 11 | #include <asm/page.h> |
540aca06 | 12 | #include <asm/page_types.h> |
e5b2bb55 | 13 | #include <asm/sections.h> |
49834396 | 14 | #include <asm/setup.h> |
f765090a | 15 | #include <asm/tlbflush.h> |
9518e0e4 | 16 | #include <asm/tlb.h> |
76c06927 | 17 | #include <asm/proto.h> |
17623915 | 18 | #include <asm/dma.h> /* for MAX_DMA_PFN */ |
9518e0e4 | 19 | |
5c51bdbe YL |
20 | #include "mm_internal.h" |
21 | ||
d1b19426 YL |
22 | unsigned long __initdata pgt_buf_start; |
23 | unsigned long __meminitdata pgt_buf_end; | |
24 | unsigned long __meminitdata pgt_buf_top; | |
f765090a | 25 | |
9985b4c6 YL |
26 | static unsigned long min_pfn_mapped; |
27 | ||
ddd3509d SS |
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 | */ | |
22c8ca2a | 37 | __ref void *alloc_low_pages(unsigned int num) |
5c51bdbe YL |
38 | { |
39 | unsigned long pfn; | |
22c8ca2a | 40 | int i; |
5c51bdbe YL |
41 | |
42 | #ifdef CONFIG_X86_64 | |
43 | if (after_bootmem) { | |
22c8ca2a | 44 | unsigned int order; |
5c51bdbe | 45 | |
22c8ca2a YL |
46 | order = get_order((unsigned long)num << PAGE_SHIFT); |
47 | return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK | | |
48 | __GFP_ZERO, order); | |
5c51bdbe YL |
49 | } |
50 | #endif | |
51 | ||
22c8ca2a | 52 | if ((pgt_buf_end + num) >= pgt_buf_top) { |
5c51bdbe YL |
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, | |
22c8ca2a | 58 | PAGE_SIZE * num , PAGE_SIZE); |
5c51bdbe YL |
59 | if (!ret) |
60 | panic("alloc_low_page: can not alloc memory"); | |
22c8ca2a | 61 | memblock_reserve(ret, PAGE_SIZE * num); |
5c51bdbe | 62 | pfn = ret >> PAGE_SHIFT; |
22c8ca2a YL |
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 | } | |
5c51bdbe | 74 | |
22c8ca2a | 75 | return __va(pfn << PAGE_SHIFT); |
5c51bdbe YL |
76 | } |
77 | ||
8d57470d YL |
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 | ||
f765090a PE |
93 | int after_bootmem; |
94 | ||
95 | int direct_gbpages | |
96 | #ifdef CONFIG_DIRECT_GBPAGES | |
97 | = 1 | |
98 | #endif | |
99 | ; | |
100 | ||
844ab6f9 JS |
101 | struct map_range { |
102 | unsigned long start; | |
103 | unsigned long end; | |
104 | unsigned page_size_mask; | |
105 | }; | |
106 | ||
fa62aafe | 107 | static int page_size_mask; |
f765090a | 108 | |
22ddfcaa | 109 | static void __init probe_page_size_mask(void) |
fa62aafe YL |
110 | { |
111 | #if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK) | |
112 | /* | |
113 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
114 | * This will simplify cpa(), which otherwise needs to support splitting | |
115 | * large pages into small in interrupt context, etc. | |
116 | */ | |
117 | if (direct_gbpages) | |
118 | page_size_mask |= 1 << PG_LEVEL_1G; | |
119 | if (cpu_has_pse) | |
120 | page_size_mask |= 1 << PG_LEVEL_2M; | |
121 | #endif | |
122 | ||
123 | /* Enable PSE if available */ | |
124 | if (cpu_has_pse) | |
125 | set_in_cr4(X86_CR4_PSE); | |
126 | ||
127 | /* Enable PGE if available */ | |
128 | if (cpu_has_pge) { | |
129 | set_in_cr4(X86_CR4_PGE); | |
130 | __supported_pte_mask |= _PAGE_GLOBAL; | |
131 | } | |
132 | } | |
279b706b | 133 | |
f765090a PE |
134 | #ifdef CONFIG_X86_32 |
135 | #define NR_RANGE_MR 3 | |
136 | #else /* CONFIG_X86_64 */ | |
137 | #define NR_RANGE_MR 5 | |
138 | #endif | |
139 | ||
dc9dd5cc JB |
140 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
141 | unsigned long start_pfn, unsigned long end_pfn, | |
142 | unsigned long page_size_mask) | |
f765090a PE |
143 | { |
144 | if (start_pfn < end_pfn) { | |
145 | if (nr_range >= NR_RANGE_MR) | |
146 | panic("run out of range for init_memory_mapping\n"); | |
147 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
148 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
149 | mr[nr_range].page_size_mask = page_size_mask; | |
150 | nr_range++; | |
151 | } | |
152 | ||
153 | return nr_range; | |
154 | } | |
155 | ||
aeebe84c YL |
156 | /* |
157 | * adjust the page_size_mask for small range to go with | |
158 | * big page size instead small one if nearby are ram too. | |
159 | */ | |
160 | static void __init_refok adjust_range_page_size_mask(struct map_range *mr, | |
161 | int nr_range) | |
162 | { | |
163 | int i; | |
164 | ||
165 | for (i = 0; i < nr_range; i++) { | |
166 | if ((page_size_mask & (1<<PG_LEVEL_2M)) && | |
167 | !(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) { | |
168 | unsigned long start = round_down(mr[i].start, PMD_SIZE); | |
169 | unsigned long end = round_up(mr[i].end, PMD_SIZE); | |
170 | ||
171 | #ifdef CONFIG_X86_32 | |
172 | if ((end >> PAGE_SHIFT) > max_low_pfn) | |
173 | continue; | |
174 | #endif | |
175 | ||
176 | if (memblock_is_region_memory(start, end - start)) | |
177 | mr[i].page_size_mask |= 1<<PG_LEVEL_2M; | |
178 | } | |
179 | if ((page_size_mask & (1<<PG_LEVEL_1G)) && | |
180 | !(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) { | |
181 | unsigned long start = round_down(mr[i].start, PUD_SIZE); | |
182 | unsigned long end = round_up(mr[i].end, PUD_SIZE); | |
183 | ||
184 | if (memblock_is_region_memory(start, end - start)) | |
185 | mr[i].page_size_mask |= 1<<PG_LEVEL_1G; | |
186 | } | |
187 | } | |
188 | } | |
189 | ||
4e33e065 YL |
190 | static int __meminit split_mem_range(struct map_range *mr, int nr_range, |
191 | unsigned long start, | |
192 | unsigned long end) | |
f765090a | 193 | { |
f765090a PE |
194 | unsigned long start_pfn, end_pfn; |
195 | unsigned long pos; | |
4e33e065 | 196 | int i; |
f765090a PE |
197 | |
198 | /* head if not big page alignment ? */ | |
199 | start_pfn = start >> PAGE_SHIFT; | |
200 | pos = start_pfn << PAGE_SHIFT; | |
201 | #ifdef CONFIG_X86_32 | |
202 | /* | |
203 | * Don't use a large page for the first 2/4MB of memory | |
204 | * because there are often fixed size MTRRs in there | |
205 | * and overlapping MTRRs into large pages can cause | |
206 | * slowdowns. | |
207 | */ | |
208 | if (pos == 0) | |
209 | end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); | |
210 | else | |
211 | end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
212 | << (PMD_SHIFT - PAGE_SHIFT); | |
213 | #else /* CONFIG_X86_64 */ | |
214 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) | |
215 | << (PMD_SHIFT - PAGE_SHIFT); | |
216 | #endif | |
217 | if (end_pfn > (end >> PAGE_SHIFT)) | |
218 | end_pfn = end >> PAGE_SHIFT; | |
219 | if (start_pfn < end_pfn) { | |
220 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
221 | pos = end_pfn << PAGE_SHIFT; | |
222 | } | |
223 | ||
224 | /* big page (2M) range */ | |
225 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
226 | << (PMD_SHIFT - PAGE_SHIFT); | |
227 | #ifdef CONFIG_X86_32 | |
228 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
229 | #else /* CONFIG_X86_64 */ | |
230 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
231 | << (PUD_SHIFT - PAGE_SHIFT); | |
232 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) | |
233 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); | |
234 | #endif | |
235 | ||
236 | if (start_pfn < end_pfn) { | |
237 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
238 | page_size_mask & (1<<PG_LEVEL_2M)); | |
239 | pos = end_pfn << PAGE_SHIFT; | |
240 | } | |
241 | ||
242 | #ifdef CONFIG_X86_64 | |
243 | /* big page (1G) range */ | |
244 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) | |
245 | << (PUD_SHIFT - PAGE_SHIFT); | |
246 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); | |
247 | if (start_pfn < end_pfn) { | |
248 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
249 | page_size_mask & | |
250 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
251 | pos = end_pfn << PAGE_SHIFT; | |
252 | } | |
253 | ||
254 | /* tail is not big page (1G) alignment */ | |
255 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) | |
256 | << (PMD_SHIFT - PAGE_SHIFT); | |
257 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
258 | if (start_pfn < end_pfn) { | |
259 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
260 | page_size_mask & (1<<PG_LEVEL_2M)); | |
261 | pos = end_pfn << PAGE_SHIFT; | |
262 | } | |
263 | #endif | |
264 | ||
265 | /* tail is not big page (2M) alignment */ | |
266 | start_pfn = pos>>PAGE_SHIFT; | |
267 | end_pfn = end>>PAGE_SHIFT; | |
268 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
269 | ||
270 | /* try to merge same page size and continuous */ | |
271 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
272 | unsigned long old_start; | |
273 | if (mr[i].end != mr[i+1].start || | |
274 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
275 | continue; | |
276 | /* move it */ | |
277 | old_start = mr[i].start; | |
278 | memmove(&mr[i], &mr[i+1], | |
279 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
280 | mr[i--].start = old_start; | |
281 | nr_range--; | |
282 | } | |
283 | ||
aeebe84c YL |
284 | if (!after_bootmem) |
285 | adjust_range_page_size_mask(mr, nr_range); | |
286 | ||
f765090a | 287 | for (i = 0; i < nr_range; i++) |
365811d6 BH |
288 | printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n", |
289 | mr[i].start, mr[i].end - 1, | |
f765090a PE |
290 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( |
291 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
292 | ||
4e33e065 YL |
293 | return nr_range; |
294 | } | |
295 | ||
66520ebc JS |
296 | static struct range pfn_mapped[E820_X_MAX]; |
297 | static int nr_pfn_mapped; | |
298 | ||
299 | static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
300 | { | |
301 | nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX, | |
302 | nr_pfn_mapped, start_pfn, end_pfn); | |
303 | nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX); | |
304 | ||
305 | max_pfn_mapped = max(max_pfn_mapped, end_pfn); | |
306 | ||
307 | if (start_pfn < (1UL<<(32-PAGE_SHIFT))) | |
308 | max_low_pfn_mapped = max(max_low_pfn_mapped, | |
309 | min(end_pfn, 1UL<<(32-PAGE_SHIFT))); | |
310 | } | |
311 | ||
312 | bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
313 | { | |
314 | int i; | |
315 | ||
316 | for (i = 0; i < nr_pfn_mapped; i++) | |
317 | if ((start_pfn >= pfn_mapped[i].start) && | |
318 | (end_pfn <= pfn_mapped[i].end)) | |
319 | return true; | |
320 | ||
321 | return false; | |
322 | } | |
323 | ||
4e33e065 YL |
324 | /* |
325 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
326 | * This runs before bootmem is initialized and gets pages directly from | |
327 | * the physical memory. To access them they are temporarily mapped. | |
328 | */ | |
329 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
330 | unsigned long end) | |
331 | { | |
332 | struct map_range mr[NR_RANGE_MR]; | |
333 | unsigned long ret = 0; | |
334 | int nr_range, i; | |
335 | ||
336 | pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n", | |
337 | start, end - 1); | |
338 | ||
339 | memset(mr, 0, sizeof(mr)); | |
340 | nr_range = split_mem_range(mr, 0, start, end); | |
341 | ||
f765090a PE |
342 | for (i = 0; i < nr_range; i++) |
343 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
344 | mr[i].page_size_mask); | |
f765090a | 345 | |
66520ebc JS |
346 | add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT); |
347 | ||
c14fa0b6 YL |
348 | return ret >> PAGE_SHIFT; |
349 | } | |
350 | ||
66520ebc | 351 | /* |
8d57470d | 352 | * would have hole in the middle or ends, and only ram parts will be mapped. |
66520ebc | 353 | */ |
8d57470d YL |
354 | static unsigned long __init init_range_memory_mapping( |
355 | unsigned long range_start, | |
f763ad1d | 356 | unsigned long range_end) |
66520ebc JS |
357 | { |
358 | unsigned long start_pfn, end_pfn; | |
8d57470d | 359 | unsigned long mapped_ram_size = 0; |
66520ebc JS |
360 | int i; |
361 | ||
66520ebc JS |
362 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { |
363 | u64 start = (u64)start_pfn << PAGE_SHIFT; | |
364 | u64 end = (u64)end_pfn << PAGE_SHIFT; | |
365 | ||
f763ad1d | 366 | if (end <= range_start) |
66520ebc JS |
367 | continue; |
368 | ||
f763ad1d YL |
369 | if (start < range_start) |
370 | start = range_start; | |
371 | ||
372 | if (start >= range_end) | |
66520ebc JS |
373 | continue; |
374 | ||
f763ad1d YL |
375 | if (end > range_end) |
376 | end = range_end; | |
66520ebc | 377 | |
f763ad1d | 378 | init_memory_mapping(start, end); |
8d57470d YL |
379 | |
380 | mapped_ram_size += end - start; | |
66520ebc | 381 | } |
8d57470d YL |
382 | |
383 | return mapped_ram_size; | |
66520ebc JS |
384 | } |
385 | ||
8d57470d YL |
386 | /* (PUD_SHIFT-PMD_SHIFT)/2 */ |
387 | #define STEP_SIZE_SHIFT 5 | |
c14fa0b6 YL |
388 | void __init init_mem_mapping(void) |
389 | { | |
8d57470d YL |
390 | unsigned long end, real_end, start, last_start; |
391 | unsigned long step_size; | |
392 | unsigned long addr; | |
393 | unsigned long mapped_ram_size = 0; | |
394 | unsigned long new_mapped_ram_size; | |
ab951937 | 395 | |
c14fa0b6 YL |
396 | probe_page_size_mask(); |
397 | ||
c14fa0b6 | 398 | #ifdef CONFIG_X86_64 |
ab951937 | 399 | end = max_pfn << PAGE_SHIFT; |
c14fa0b6 | 400 | #else |
ab951937 | 401 | end = max_low_pfn << PAGE_SHIFT; |
c14fa0b6 | 402 | #endif |
ab951937 | 403 | |
f763ad1d YL |
404 | /* the ISA range is always mapped regardless of memory holes */ |
405 | init_memory_mapping(0, ISA_END_ADDRESS); | |
8d57470d YL |
406 | |
407 | /* xen has big range in reserved near end of ram, skip it at first */ | |
408 | addr = memblock_find_in_range(ISA_END_ADDRESS, end, PMD_SIZE, | |
409 | PAGE_SIZE); | |
410 | real_end = addr + PMD_SIZE; | |
411 | ||
412 | /* step_size need to be small so pgt_buf from BRK could cover it */ | |
413 | step_size = PMD_SIZE; | |
414 | max_pfn_mapped = 0; /* will get exact value next */ | |
415 | min_pfn_mapped = real_end >> PAGE_SHIFT; | |
416 | last_start = start = real_end; | |
417 | while (last_start > ISA_END_ADDRESS) { | |
418 | if (last_start > step_size) { | |
419 | start = round_down(last_start - 1, step_size); | |
420 | if (start < ISA_END_ADDRESS) | |
421 | start = ISA_END_ADDRESS; | |
422 | } else | |
423 | start = ISA_END_ADDRESS; | |
424 | new_mapped_ram_size = init_range_memory_mapping(start, | |
425 | last_start); | |
426 | last_start = start; | |
427 | min_pfn_mapped = last_start >> PAGE_SHIFT; | |
428 | /* only increase step_size after big range get mapped */ | |
429 | if (new_mapped_ram_size > mapped_ram_size) | |
430 | step_size <<= STEP_SIZE_SHIFT; | |
431 | mapped_ram_size += new_mapped_ram_size; | |
432 | } | |
433 | ||
434 | if (real_end < end) | |
435 | init_range_memory_mapping(real_end, end); | |
436 | ||
f763ad1d YL |
437 | #ifdef CONFIG_X86_64 |
438 | if (max_pfn > max_low_pfn) { | |
439 | /* can we preseve max_low_pfn ?*/ | |
440 | max_low_pfn = max_pfn; | |
441 | } | |
719272c4 YL |
442 | #else |
443 | early_ioremap_page_table_range_init(); | |
444 | load_cr3(swapper_pg_dir); | |
445 | __flush_tlb_all(); | |
f763ad1d | 446 | #endif |
719272c4 | 447 | |
c14fa0b6 | 448 | early_memtest(0, max_pfn_mapped << PAGE_SHIFT); |
22ddfcaa | 449 | } |
e5b2bb55 | 450 | |
540aca06 PE |
451 | /* |
452 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
453 | * is valid. The argument is a physical page number. | |
454 | * | |
455 | * | |
456 | * On x86, access has to be given to the first megabyte of ram because that area | |
457 | * contains bios code and data regions used by X and dosemu and similar apps. | |
458 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
459 | * mmio resources as well as potential bios/acpi data regions. | |
460 | */ | |
461 | int devmem_is_allowed(unsigned long pagenr) | |
462 | { | |
73e8f3d7 | 463 | if (pagenr < 256) |
540aca06 PE |
464 | return 1; |
465 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
466 | return 0; | |
467 | if (!page_is_ram(pagenr)) | |
468 | return 1; | |
469 | return 0; | |
470 | } | |
471 | ||
e5b2bb55 PE |
472 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
473 | { | |
c967da6a YL |
474 | unsigned long addr; |
475 | unsigned long begin_aligned, end_aligned; | |
e5b2bb55 | 476 | |
c967da6a YL |
477 | /* Make sure boundaries are page aligned */ |
478 | begin_aligned = PAGE_ALIGN(begin); | |
479 | end_aligned = end & PAGE_MASK; | |
480 | ||
481 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
482 | begin = begin_aligned; | |
483 | end = end_aligned; | |
484 | } | |
485 | ||
486 | if (begin >= end) | |
e5b2bb55 PE |
487 | return; |
488 | ||
c967da6a YL |
489 | addr = begin; |
490 | ||
e5b2bb55 PE |
491 | /* |
492 | * If debugging page accesses then do not free this memory but | |
493 | * mark them not present - any buggy init-section access will | |
494 | * create a kernel page fault: | |
495 | */ | |
496 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
365811d6 BH |
497 | printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n", |
498 | begin, end - 1); | |
e5b2bb55 PE |
499 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
500 | #else | |
501 | /* | |
502 | * We just marked the kernel text read only above, now that | |
503 | * we are going to free part of that, we need to make that | |
5bd5a452 | 504 | * writeable and non-executable first. |
e5b2bb55 | 505 | */ |
5bd5a452 | 506 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); |
e5b2bb55 PE |
507 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); |
508 | ||
509 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
510 | ||
511 | for (; addr < end; addr += PAGE_SIZE) { | |
512 | ClearPageReserved(virt_to_page(addr)); | |
513 | init_page_count(virt_to_page(addr)); | |
c967da6a | 514 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
e5b2bb55 PE |
515 | free_page(addr); |
516 | totalram_pages++; | |
517 | } | |
518 | #endif | |
519 | } | |
520 | ||
521 | void free_initmem(void) | |
522 | { | |
523 | free_init_pages("unused kernel memory", | |
524 | (unsigned long)(&__init_begin), | |
525 | (unsigned long)(&__init_end)); | |
526 | } | |
731ddea6 PE |
527 | |
528 | #ifdef CONFIG_BLK_DEV_INITRD | |
0d26d1d8 | 529 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
731ddea6 | 530 | { |
c967da6a YL |
531 | /* |
532 | * end could be not aligned, and We can not align that, | |
533 | * decompresser could be confused by aligned initrd_end | |
534 | * We already reserve the end partial page before in | |
535 | * - i386_start_kernel() | |
536 | * - x86_64_start_kernel() | |
537 | * - relocate_initrd() | |
538 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
539 | */ | |
540 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
731ddea6 PE |
541 | } |
542 | #endif | |
17623915 PE |
543 | |
544 | void __init zone_sizes_init(void) | |
545 | { | |
546 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
547 | ||
548 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
549 | ||
550 | #ifdef CONFIG_ZONE_DMA | |
551 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
552 | #endif | |
553 | #ifdef CONFIG_ZONE_DMA32 | |
554 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
555 | #endif | |
556 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
557 | #ifdef CONFIG_HIGHMEM | |
558 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; | |
559 | #endif | |
560 | ||
561 | free_area_init_nodes(max_zone_pfns); | |
562 | } | |
563 |