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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 | ||
cf470659 YL |
22 | static unsigned long __initdata pgt_buf_start; |
23 | static unsigned long __initdata pgt_buf_end; | |
24 | static unsigned long __initdata 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 | 41 | |
5c51bdbe | 42 | if (after_bootmem) { |
22c8ca2a | 43 | unsigned int order; |
5c51bdbe | 44 | |
22c8ca2a YL |
45 | order = get_order((unsigned long)num << PAGE_SHIFT); |
46 | return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK | | |
47 | __GFP_ZERO, order); | |
5c51bdbe | 48 | } |
5c51bdbe | 49 | |
22c8ca2a | 50 | if ((pgt_buf_end + num) >= pgt_buf_top) { |
5c51bdbe YL |
51 | unsigned long ret; |
52 | if (min_pfn_mapped >= max_pfn_mapped) | |
53 | panic("alloc_low_page: ran out of memory"); | |
54 | ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT, | |
55 | max_pfn_mapped << PAGE_SHIFT, | |
22c8ca2a | 56 | PAGE_SIZE * num , PAGE_SIZE); |
5c51bdbe YL |
57 | if (!ret) |
58 | panic("alloc_low_page: can not alloc memory"); | |
22c8ca2a | 59 | memblock_reserve(ret, PAGE_SIZE * num); |
5c51bdbe | 60 | pfn = ret >> PAGE_SHIFT; |
22c8ca2a YL |
61 | } else { |
62 | pfn = pgt_buf_end; | |
63 | pgt_buf_end += num; | |
64 | } | |
65 | ||
66 | for (i = 0; i < num; i++) { | |
67 | void *adr; | |
68 | ||
69 | adr = __va((pfn + i) << PAGE_SHIFT); | |
70 | clear_page(adr); | |
71 | } | |
5c51bdbe | 72 | |
22c8ca2a | 73 | return __va(pfn << PAGE_SHIFT); |
5c51bdbe YL |
74 | } |
75 | ||
8d57470d YL |
76 | /* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */ |
77 | #define INIT_PGT_BUF_SIZE (5 * PAGE_SIZE) | |
78 | RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE); | |
79 | void __init early_alloc_pgt_buf(void) | |
80 | { | |
81 | unsigned long tables = INIT_PGT_BUF_SIZE; | |
82 | phys_addr_t base; | |
83 | ||
84 | base = __pa(extend_brk(tables, PAGE_SIZE)); | |
85 | ||
86 | pgt_buf_start = base >> PAGE_SHIFT; | |
87 | pgt_buf_end = pgt_buf_start; | |
88 | pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); | |
89 | } | |
90 | ||
f765090a PE |
91 | int after_bootmem; |
92 | ||
93 | int direct_gbpages | |
94 | #ifdef CONFIG_DIRECT_GBPAGES | |
95 | = 1 | |
96 | #endif | |
97 | ; | |
98 | ||
148b2098 YL |
99 | static void __init init_gbpages(void) |
100 | { | |
101 | #ifdef CONFIG_X86_64 | |
102 | if (direct_gbpages && cpu_has_gbpages) | |
103 | printk(KERN_INFO "Using GB pages for direct mapping\n"); | |
104 | else | |
105 | direct_gbpages = 0; | |
106 | #endif | |
107 | } | |
108 | ||
844ab6f9 JS |
109 | struct map_range { |
110 | unsigned long start; | |
111 | unsigned long end; | |
112 | unsigned page_size_mask; | |
113 | }; | |
114 | ||
fa62aafe | 115 | static int page_size_mask; |
f765090a | 116 | |
22ddfcaa | 117 | static void __init probe_page_size_mask(void) |
fa62aafe | 118 | { |
148b2098 YL |
119 | init_gbpages(); |
120 | ||
fa62aafe YL |
121 | #if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK) |
122 | /* | |
123 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
124 | * This will simplify cpa(), which otherwise needs to support splitting | |
125 | * large pages into small in interrupt context, etc. | |
126 | */ | |
127 | if (direct_gbpages) | |
128 | page_size_mask |= 1 << PG_LEVEL_1G; | |
129 | if (cpu_has_pse) | |
130 | page_size_mask |= 1 << PG_LEVEL_2M; | |
131 | #endif | |
132 | ||
133 | /* Enable PSE if available */ | |
134 | if (cpu_has_pse) | |
135 | set_in_cr4(X86_CR4_PSE); | |
136 | ||
137 | /* Enable PGE if available */ | |
138 | if (cpu_has_pge) { | |
139 | set_in_cr4(X86_CR4_PGE); | |
140 | __supported_pte_mask |= _PAGE_GLOBAL; | |
141 | } | |
142 | } | |
279b706b | 143 | |
f765090a PE |
144 | #ifdef CONFIG_X86_32 |
145 | #define NR_RANGE_MR 3 | |
146 | #else /* CONFIG_X86_64 */ | |
147 | #define NR_RANGE_MR 5 | |
148 | #endif | |
149 | ||
dc9dd5cc JB |
150 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
151 | unsigned long start_pfn, unsigned long end_pfn, | |
152 | unsigned long page_size_mask) | |
f765090a PE |
153 | { |
154 | if (start_pfn < end_pfn) { | |
155 | if (nr_range >= NR_RANGE_MR) | |
156 | panic("run out of range for init_memory_mapping\n"); | |
157 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
158 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
159 | mr[nr_range].page_size_mask = page_size_mask; | |
160 | nr_range++; | |
161 | } | |
162 | ||
163 | return nr_range; | |
164 | } | |
165 | ||
aeebe84c YL |
166 | /* |
167 | * adjust the page_size_mask for small range to go with | |
168 | * big page size instead small one if nearby are ram too. | |
169 | */ | |
170 | static void __init_refok adjust_range_page_size_mask(struct map_range *mr, | |
171 | int nr_range) | |
172 | { | |
173 | int i; | |
174 | ||
175 | for (i = 0; i < nr_range; i++) { | |
176 | if ((page_size_mask & (1<<PG_LEVEL_2M)) && | |
177 | !(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) { | |
178 | unsigned long start = round_down(mr[i].start, PMD_SIZE); | |
179 | unsigned long end = round_up(mr[i].end, PMD_SIZE); | |
180 | ||
181 | #ifdef CONFIG_X86_32 | |
182 | if ((end >> PAGE_SHIFT) > max_low_pfn) | |
183 | continue; | |
184 | #endif | |
185 | ||
186 | if (memblock_is_region_memory(start, end - start)) | |
187 | mr[i].page_size_mask |= 1<<PG_LEVEL_2M; | |
188 | } | |
189 | if ((page_size_mask & (1<<PG_LEVEL_1G)) && | |
190 | !(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) { | |
191 | unsigned long start = round_down(mr[i].start, PUD_SIZE); | |
192 | unsigned long end = round_up(mr[i].end, PUD_SIZE); | |
193 | ||
194 | if (memblock_is_region_memory(start, end - start)) | |
195 | mr[i].page_size_mask |= 1<<PG_LEVEL_1G; | |
196 | } | |
197 | } | |
198 | } | |
199 | ||
4e33e065 YL |
200 | static int __meminit split_mem_range(struct map_range *mr, int nr_range, |
201 | unsigned long start, | |
202 | unsigned long end) | |
f765090a | 203 | { |
2e8059ed | 204 | unsigned long start_pfn, end_pfn, limit_pfn; |
1829ae9a | 205 | unsigned long pfn; |
4e33e065 | 206 | int i; |
f765090a | 207 | |
2e8059ed YL |
208 | limit_pfn = PFN_DOWN(end); |
209 | ||
f765090a | 210 | /* head if not big page alignment ? */ |
1829ae9a | 211 | pfn = start_pfn = PFN_DOWN(start); |
f765090a PE |
212 | #ifdef CONFIG_X86_32 |
213 | /* | |
214 | * Don't use a large page for the first 2/4MB of memory | |
215 | * because there are often fixed size MTRRs in there | |
216 | * and overlapping MTRRs into large pages can cause | |
217 | * slowdowns. | |
218 | */ | |
1829ae9a | 219 | if (pfn == 0) |
84d77001 | 220 | end_pfn = PFN_DOWN(PMD_SIZE); |
f765090a | 221 | else |
1829ae9a | 222 | end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 223 | #else /* CONFIG_X86_64 */ |
1829ae9a | 224 | end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 225 | #endif |
2e8059ed YL |
226 | if (end_pfn > limit_pfn) |
227 | end_pfn = limit_pfn; | |
f765090a PE |
228 | if (start_pfn < end_pfn) { |
229 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
1829ae9a | 230 | pfn = end_pfn; |
f765090a PE |
231 | } |
232 | ||
233 | /* big page (2M) range */ | |
1829ae9a | 234 | start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 235 | #ifdef CONFIG_X86_32 |
2e8059ed | 236 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 237 | #else /* CONFIG_X86_64 */ |
1829ae9a | 238 | end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); |
2e8059ed YL |
239 | if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE))) |
240 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); | |
f765090a PE |
241 | #endif |
242 | ||
243 | if (start_pfn < end_pfn) { | |
244 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
245 | page_size_mask & (1<<PG_LEVEL_2M)); | |
1829ae9a | 246 | pfn = end_pfn; |
f765090a PE |
247 | } |
248 | ||
249 | #ifdef CONFIG_X86_64 | |
250 | /* big page (1G) range */ | |
1829ae9a | 251 | start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); |
2e8059ed | 252 | end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE)); |
f765090a PE |
253 | if (start_pfn < end_pfn) { |
254 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
255 | page_size_mask & | |
256 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
1829ae9a | 257 | pfn = end_pfn; |
f765090a PE |
258 | } |
259 | ||
260 | /* tail is not big page (1G) alignment */ | |
1829ae9a | 261 | start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
2e8059ed | 262 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); |
f765090a PE |
263 | if (start_pfn < end_pfn) { |
264 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
265 | page_size_mask & (1<<PG_LEVEL_2M)); | |
1829ae9a | 266 | pfn = end_pfn; |
f765090a PE |
267 | } |
268 | #endif | |
269 | ||
270 | /* tail is not big page (2M) alignment */ | |
1829ae9a | 271 | start_pfn = pfn; |
2e8059ed | 272 | end_pfn = limit_pfn; |
f765090a PE |
273 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
274 | ||
275 | /* try to merge same page size and continuous */ | |
276 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
277 | unsigned long old_start; | |
278 | if (mr[i].end != mr[i+1].start || | |
279 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
280 | continue; | |
281 | /* move it */ | |
282 | old_start = mr[i].start; | |
283 | memmove(&mr[i], &mr[i+1], | |
284 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
285 | mr[i--].start = old_start; | |
286 | nr_range--; | |
287 | } | |
288 | ||
aeebe84c YL |
289 | if (!after_bootmem) |
290 | adjust_range_page_size_mask(mr, nr_range); | |
291 | ||
f765090a | 292 | for (i = 0; i < nr_range; i++) |
365811d6 BH |
293 | printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n", |
294 | mr[i].start, mr[i].end - 1, | |
f765090a PE |
295 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( |
296 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
297 | ||
4e33e065 YL |
298 | return nr_range; |
299 | } | |
300 | ||
66520ebc JS |
301 | static struct range pfn_mapped[E820_X_MAX]; |
302 | static int nr_pfn_mapped; | |
303 | ||
304 | static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
305 | { | |
306 | nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX, | |
307 | nr_pfn_mapped, start_pfn, end_pfn); | |
308 | nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX); | |
309 | ||
310 | max_pfn_mapped = max(max_pfn_mapped, end_pfn); | |
311 | ||
312 | if (start_pfn < (1UL<<(32-PAGE_SHIFT))) | |
313 | max_low_pfn_mapped = max(max_low_pfn_mapped, | |
314 | min(end_pfn, 1UL<<(32-PAGE_SHIFT))); | |
315 | } | |
316 | ||
317 | bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
318 | { | |
319 | int i; | |
320 | ||
321 | for (i = 0; i < nr_pfn_mapped; i++) | |
322 | if ((start_pfn >= pfn_mapped[i].start) && | |
323 | (end_pfn <= pfn_mapped[i].end)) | |
324 | return true; | |
325 | ||
326 | return false; | |
327 | } | |
328 | ||
4e33e065 YL |
329 | /* |
330 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
331 | * This runs before bootmem is initialized and gets pages directly from | |
332 | * the physical memory. To access them they are temporarily mapped. | |
333 | */ | |
334 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
335 | unsigned long end) | |
336 | { | |
337 | struct map_range mr[NR_RANGE_MR]; | |
338 | unsigned long ret = 0; | |
339 | int nr_range, i; | |
340 | ||
341 | pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n", | |
342 | start, end - 1); | |
343 | ||
344 | memset(mr, 0, sizeof(mr)); | |
345 | nr_range = split_mem_range(mr, 0, start, end); | |
346 | ||
f765090a PE |
347 | for (i = 0; i < nr_range; i++) |
348 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
349 | mr[i].page_size_mask); | |
f765090a | 350 | |
66520ebc JS |
351 | add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT); |
352 | ||
c14fa0b6 YL |
353 | return ret >> PAGE_SHIFT; |
354 | } | |
355 | ||
66520ebc | 356 | /* |
8d57470d | 357 | * would have hole in the middle or ends, and only ram parts will be mapped. |
66520ebc | 358 | */ |
8d57470d | 359 | static unsigned long __init init_range_memory_mapping( |
b8fd39c0 YL |
360 | unsigned long r_start, |
361 | unsigned long r_end) | |
66520ebc JS |
362 | { |
363 | unsigned long start_pfn, end_pfn; | |
8d57470d | 364 | unsigned long mapped_ram_size = 0; |
66520ebc JS |
365 | int i; |
366 | ||
66520ebc | 367 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { |
b8fd39c0 YL |
368 | u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end); |
369 | u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end); | |
370 | if (start >= end) | |
66520ebc JS |
371 | continue; |
372 | ||
f763ad1d | 373 | init_memory_mapping(start, end); |
8d57470d | 374 | mapped_ram_size += end - start; |
66520ebc | 375 | } |
8d57470d YL |
376 | |
377 | return mapped_ram_size; | |
66520ebc JS |
378 | } |
379 | ||
8d57470d YL |
380 | /* (PUD_SHIFT-PMD_SHIFT)/2 */ |
381 | #define STEP_SIZE_SHIFT 5 | |
c14fa0b6 YL |
382 | void __init init_mem_mapping(void) |
383 | { | |
8d57470d YL |
384 | unsigned long end, real_end, start, last_start; |
385 | unsigned long step_size; | |
386 | unsigned long addr; | |
387 | unsigned long mapped_ram_size = 0; | |
388 | unsigned long new_mapped_ram_size; | |
ab951937 | 389 | |
c14fa0b6 YL |
390 | probe_page_size_mask(); |
391 | ||
c14fa0b6 | 392 | #ifdef CONFIG_X86_64 |
ab951937 | 393 | end = max_pfn << PAGE_SHIFT; |
c14fa0b6 | 394 | #else |
ab951937 | 395 | end = max_low_pfn << PAGE_SHIFT; |
c14fa0b6 | 396 | #endif |
ab951937 | 397 | |
f763ad1d YL |
398 | /* the ISA range is always mapped regardless of memory holes */ |
399 | init_memory_mapping(0, ISA_END_ADDRESS); | |
8d57470d YL |
400 | |
401 | /* xen has big range in reserved near end of ram, skip it at first */ | |
402 | addr = memblock_find_in_range(ISA_END_ADDRESS, end, PMD_SIZE, | |
403 | PAGE_SIZE); | |
404 | real_end = addr + PMD_SIZE; | |
405 | ||
406 | /* step_size need to be small so pgt_buf from BRK could cover it */ | |
407 | step_size = PMD_SIZE; | |
408 | max_pfn_mapped = 0; /* will get exact value next */ | |
409 | min_pfn_mapped = real_end >> PAGE_SHIFT; | |
410 | last_start = start = real_end; | |
411 | while (last_start > ISA_END_ADDRESS) { | |
412 | if (last_start > step_size) { | |
413 | start = round_down(last_start - 1, step_size); | |
414 | if (start < ISA_END_ADDRESS) | |
415 | start = ISA_END_ADDRESS; | |
416 | } else | |
417 | start = ISA_END_ADDRESS; | |
418 | new_mapped_ram_size = init_range_memory_mapping(start, | |
419 | last_start); | |
420 | last_start = start; | |
421 | min_pfn_mapped = last_start >> PAGE_SHIFT; | |
422 | /* only increase step_size after big range get mapped */ | |
423 | if (new_mapped_ram_size > mapped_ram_size) | |
424 | step_size <<= STEP_SIZE_SHIFT; | |
425 | mapped_ram_size += new_mapped_ram_size; | |
426 | } | |
427 | ||
428 | if (real_end < end) | |
429 | init_range_memory_mapping(real_end, end); | |
430 | ||
f763ad1d YL |
431 | #ifdef CONFIG_X86_64 |
432 | if (max_pfn > max_low_pfn) { | |
433 | /* can we preseve max_low_pfn ?*/ | |
434 | max_low_pfn = max_pfn; | |
435 | } | |
719272c4 YL |
436 | #else |
437 | early_ioremap_page_table_range_init(); | |
438 | load_cr3(swapper_pg_dir); | |
439 | __flush_tlb_all(); | |
f763ad1d | 440 | #endif |
719272c4 | 441 | |
c14fa0b6 | 442 | early_memtest(0, max_pfn_mapped << PAGE_SHIFT); |
22ddfcaa | 443 | } |
e5b2bb55 | 444 | |
540aca06 PE |
445 | /* |
446 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
447 | * is valid. The argument is a physical page number. | |
448 | * | |
449 | * | |
450 | * On x86, access has to be given to the first megabyte of ram because that area | |
451 | * contains bios code and data regions used by X and dosemu and similar apps. | |
452 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
453 | * mmio resources as well as potential bios/acpi data regions. | |
454 | */ | |
455 | int devmem_is_allowed(unsigned long pagenr) | |
456 | { | |
73e8f3d7 | 457 | if (pagenr < 256) |
540aca06 PE |
458 | return 1; |
459 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
460 | return 0; | |
461 | if (!page_is_ram(pagenr)) | |
462 | return 1; | |
463 | return 0; | |
464 | } | |
465 | ||
e5b2bb55 PE |
466 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
467 | { | |
c967da6a YL |
468 | unsigned long addr; |
469 | unsigned long begin_aligned, end_aligned; | |
e5b2bb55 | 470 | |
c967da6a YL |
471 | /* Make sure boundaries are page aligned */ |
472 | begin_aligned = PAGE_ALIGN(begin); | |
473 | end_aligned = end & PAGE_MASK; | |
474 | ||
475 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
476 | begin = begin_aligned; | |
477 | end = end_aligned; | |
478 | } | |
479 | ||
480 | if (begin >= end) | |
e5b2bb55 PE |
481 | return; |
482 | ||
c967da6a YL |
483 | addr = begin; |
484 | ||
e5b2bb55 PE |
485 | /* |
486 | * If debugging page accesses then do not free this memory but | |
487 | * mark them not present - any buggy init-section access will | |
488 | * create a kernel page fault: | |
489 | */ | |
490 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
365811d6 BH |
491 | printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n", |
492 | begin, end - 1); | |
e5b2bb55 PE |
493 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
494 | #else | |
495 | /* | |
496 | * We just marked the kernel text read only above, now that | |
497 | * we are going to free part of that, we need to make that | |
5bd5a452 | 498 | * writeable and non-executable first. |
e5b2bb55 | 499 | */ |
5bd5a452 | 500 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); |
e5b2bb55 PE |
501 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); |
502 | ||
503 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
504 | ||
505 | for (; addr < end; addr += PAGE_SIZE) { | |
506 | ClearPageReserved(virt_to_page(addr)); | |
507 | init_page_count(virt_to_page(addr)); | |
c967da6a | 508 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
e5b2bb55 PE |
509 | free_page(addr); |
510 | totalram_pages++; | |
511 | } | |
512 | #endif | |
513 | } | |
514 | ||
515 | void free_initmem(void) | |
516 | { | |
517 | free_init_pages("unused kernel memory", | |
518 | (unsigned long)(&__init_begin), | |
519 | (unsigned long)(&__init_end)); | |
520 | } | |
731ddea6 PE |
521 | |
522 | #ifdef CONFIG_BLK_DEV_INITRD | |
0d26d1d8 | 523 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
731ddea6 | 524 | { |
c967da6a YL |
525 | /* |
526 | * end could be not aligned, and We can not align that, | |
527 | * decompresser could be confused by aligned initrd_end | |
528 | * We already reserve the end partial page before in | |
529 | * - i386_start_kernel() | |
530 | * - x86_64_start_kernel() | |
531 | * - relocate_initrd() | |
532 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
533 | */ | |
534 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
731ddea6 PE |
535 | } |
536 | #endif | |
17623915 PE |
537 | |
538 | void __init zone_sizes_init(void) | |
539 | { | |
540 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
541 | ||
542 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
543 | ||
544 | #ifdef CONFIG_ZONE_DMA | |
545 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
546 | #endif | |
547 | #ifdef CONFIG_ZONE_DMA32 | |
548 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
549 | #endif | |
550 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
551 | #ifdef CONFIG_HIGHMEM | |
552 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; | |
553 | #endif | |
554 | ||
555 | free_area_init_nodes(max_zone_pfns); | |
556 | } | |
557 |