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 | ||
c9b3234a YL |
28 | static bool __initdata can_use_brk_pgt = true; |
29 | ||
ddd3509d SS |
30 | /* |
31 | * Pages returned are already directly mapped. | |
32 | * | |
33 | * Changing that is likely to break Xen, see commit: | |
34 | * | |
35 | * 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve | |
36 | * | |
37 | * for detailed information. | |
38 | */ | |
22c8ca2a | 39 | __ref void *alloc_low_pages(unsigned int num) |
5c51bdbe YL |
40 | { |
41 | unsigned long pfn; | |
22c8ca2a | 42 | int i; |
5c51bdbe | 43 | |
5c51bdbe | 44 | if (after_bootmem) { |
22c8ca2a | 45 | unsigned int order; |
5c51bdbe | 46 | |
22c8ca2a YL |
47 | order = get_order((unsigned long)num << PAGE_SHIFT); |
48 | return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK | | |
49 | __GFP_ZERO, order); | |
5c51bdbe | 50 | } |
5c51bdbe | 51 | |
c9b3234a | 52 | if ((pgt_buf_end + num) > pgt_buf_top || !can_use_brk_pgt) { |
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; | |
c9b3234a YL |
66 | printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n", |
67 | pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1); | |
22c8ca2a YL |
68 | } |
69 | ||
70 | for (i = 0; i < num; i++) { | |
71 | void *adr; | |
72 | ||
73 | adr = __va((pfn + i) << PAGE_SHIFT); | |
74 | clear_page(adr); | |
75 | } | |
5c51bdbe | 76 | |
22c8ca2a | 77 | return __va(pfn << PAGE_SHIFT); |
5c51bdbe YL |
78 | } |
79 | ||
8d57470d YL |
80 | /* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */ |
81 | #define INIT_PGT_BUF_SIZE (5 * PAGE_SIZE) | |
82 | RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE); | |
83 | void __init early_alloc_pgt_buf(void) | |
84 | { | |
85 | unsigned long tables = INIT_PGT_BUF_SIZE; | |
86 | phys_addr_t base; | |
87 | ||
88 | base = __pa(extend_brk(tables, PAGE_SIZE)); | |
89 | ||
90 | pgt_buf_start = base >> PAGE_SHIFT; | |
91 | pgt_buf_end = pgt_buf_start; | |
92 | pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); | |
93 | } | |
94 | ||
f765090a PE |
95 | int after_bootmem; |
96 | ||
97 | int direct_gbpages | |
98 | #ifdef CONFIG_DIRECT_GBPAGES | |
99 | = 1 | |
100 | #endif | |
101 | ; | |
102 | ||
148b2098 YL |
103 | static void __init init_gbpages(void) |
104 | { | |
105 | #ifdef CONFIG_X86_64 | |
106 | if (direct_gbpages && cpu_has_gbpages) | |
107 | printk(KERN_INFO "Using GB pages for direct mapping\n"); | |
108 | else | |
109 | direct_gbpages = 0; | |
110 | #endif | |
111 | } | |
112 | ||
844ab6f9 JS |
113 | struct map_range { |
114 | unsigned long start; | |
115 | unsigned long end; | |
116 | unsigned page_size_mask; | |
117 | }; | |
118 | ||
fa62aafe | 119 | static int page_size_mask; |
f765090a | 120 | |
22ddfcaa | 121 | static void __init probe_page_size_mask(void) |
fa62aafe | 122 | { |
148b2098 YL |
123 | init_gbpages(); |
124 | ||
fa62aafe YL |
125 | #if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK) |
126 | /* | |
127 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
128 | * This will simplify cpa(), which otherwise needs to support splitting | |
129 | * large pages into small in interrupt context, etc. | |
130 | */ | |
131 | if (direct_gbpages) | |
132 | page_size_mask |= 1 << PG_LEVEL_1G; | |
133 | if (cpu_has_pse) | |
134 | page_size_mask |= 1 << PG_LEVEL_2M; | |
135 | #endif | |
136 | ||
137 | /* Enable PSE if available */ | |
138 | if (cpu_has_pse) | |
139 | set_in_cr4(X86_CR4_PSE); | |
140 | ||
141 | /* Enable PGE if available */ | |
142 | if (cpu_has_pge) { | |
143 | set_in_cr4(X86_CR4_PGE); | |
144 | __supported_pte_mask |= _PAGE_GLOBAL; | |
145 | } | |
146 | } | |
279b706b | 147 | |
f765090a PE |
148 | #ifdef CONFIG_X86_32 |
149 | #define NR_RANGE_MR 3 | |
150 | #else /* CONFIG_X86_64 */ | |
151 | #define NR_RANGE_MR 5 | |
152 | #endif | |
153 | ||
dc9dd5cc JB |
154 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
155 | unsigned long start_pfn, unsigned long end_pfn, | |
156 | unsigned long page_size_mask) | |
f765090a PE |
157 | { |
158 | if (start_pfn < end_pfn) { | |
159 | if (nr_range >= NR_RANGE_MR) | |
160 | panic("run out of range for init_memory_mapping\n"); | |
161 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
162 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
163 | mr[nr_range].page_size_mask = page_size_mask; | |
164 | nr_range++; | |
165 | } | |
166 | ||
167 | return nr_range; | |
168 | } | |
169 | ||
aeebe84c YL |
170 | /* |
171 | * adjust the page_size_mask for small range to go with | |
172 | * big page size instead small one if nearby are ram too. | |
173 | */ | |
174 | static void __init_refok adjust_range_page_size_mask(struct map_range *mr, | |
175 | int nr_range) | |
176 | { | |
177 | int i; | |
178 | ||
179 | for (i = 0; i < nr_range; i++) { | |
180 | if ((page_size_mask & (1<<PG_LEVEL_2M)) && | |
181 | !(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) { | |
182 | unsigned long start = round_down(mr[i].start, PMD_SIZE); | |
183 | unsigned long end = round_up(mr[i].end, PMD_SIZE); | |
184 | ||
185 | #ifdef CONFIG_X86_32 | |
186 | if ((end >> PAGE_SHIFT) > max_low_pfn) | |
187 | continue; | |
188 | #endif | |
189 | ||
190 | if (memblock_is_region_memory(start, end - start)) | |
191 | mr[i].page_size_mask |= 1<<PG_LEVEL_2M; | |
192 | } | |
193 | if ((page_size_mask & (1<<PG_LEVEL_1G)) && | |
194 | !(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) { | |
195 | unsigned long start = round_down(mr[i].start, PUD_SIZE); | |
196 | unsigned long end = round_up(mr[i].end, PUD_SIZE); | |
197 | ||
198 | if (memblock_is_region_memory(start, end - start)) | |
199 | mr[i].page_size_mask |= 1<<PG_LEVEL_1G; | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
4e33e065 YL |
204 | static int __meminit split_mem_range(struct map_range *mr, int nr_range, |
205 | unsigned long start, | |
206 | unsigned long end) | |
f765090a | 207 | { |
2e8059ed | 208 | unsigned long start_pfn, end_pfn, limit_pfn; |
1829ae9a | 209 | unsigned long pfn; |
4e33e065 | 210 | int i; |
f765090a | 211 | |
2e8059ed YL |
212 | limit_pfn = PFN_DOWN(end); |
213 | ||
f765090a | 214 | /* head if not big page alignment ? */ |
1829ae9a | 215 | pfn = start_pfn = PFN_DOWN(start); |
f765090a PE |
216 | #ifdef CONFIG_X86_32 |
217 | /* | |
218 | * Don't use a large page for the first 2/4MB of memory | |
219 | * because there are often fixed size MTRRs in there | |
220 | * and overlapping MTRRs into large pages can cause | |
221 | * slowdowns. | |
222 | */ | |
1829ae9a | 223 | if (pfn == 0) |
84d77001 | 224 | end_pfn = PFN_DOWN(PMD_SIZE); |
f765090a | 225 | else |
1829ae9a | 226 | end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 227 | #else /* CONFIG_X86_64 */ |
1829ae9a | 228 | end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 229 | #endif |
2e8059ed YL |
230 | if (end_pfn > limit_pfn) |
231 | end_pfn = limit_pfn; | |
f765090a PE |
232 | if (start_pfn < end_pfn) { |
233 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
1829ae9a | 234 | pfn = end_pfn; |
f765090a PE |
235 | } |
236 | ||
237 | /* big page (2M) range */ | |
1829ae9a | 238 | start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 239 | #ifdef CONFIG_X86_32 |
2e8059ed | 240 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 241 | #else /* CONFIG_X86_64 */ |
1829ae9a | 242 | end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); |
2e8059ed YL |
243 | if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE))) |
244 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); | |
f765090a PE |
245 | #endif |
246 | ||
247 | if (start_pfn < end_pfn) { | |
248 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
249 | page_size_mask & (1<<PG_LEVEL_2M)); | |
1829ae9a | 250 | pfn = end_pfn; |
f765090a PE |
251 | } |
252 | ||
253 | #ifdef CONFIG_X86_64 | |
254 | /* big page (1G) range */ | |
1829ae9a | 255 | start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); |
2e8059ed | 256 | end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE)); |
f765090a PE |
257 | if (start_pfn < end_pfn) { |
258 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
259 | page_size_mask & | |
260 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
1829ae9a | 261 | pfn = end_pfn; |
f765090a PE |
262 | } |
263 | ||
264 | /* tail is not big page (1G) alignment */ | |
1829ae9a | 265 | start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
2e8059ed | 266 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); |
f765090a PE |
267 | if (start_pfn < end_pfn) { |
268 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
269 | page_size_mask & (1<<PG_LEVEL_2M)); | |
1829ae9a | 270 | pfn = end_pfn; |
f765090a PE |
271 | } |
272 | #endif | |
273 | ||
274 | /* tail is not big page (2M) alignment */ | |
1829ae9a | 275 | start_pfn = pfn; |
2e8059ed | 276 | end_pfn = limit_pfn; |
f765090a PE |
277 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
278 | ||
279 | /* try to merge same page size and continuous */ | |
280 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
281 | unsigned long old_start; | |
282 | if (mr[i].end != mr[i+1].start || | |
283 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
284 | continue; | |
285 | /* move it */ | |
286 | old_start = mr[i].start; | |
287 | memmove(&mr[i], &mr[i+1], | |
288 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
289 | mr[i--].start = old_start; | |
290 | nr_range--; | |
291 | } | |
292 | ||
aeebe84c YL |
293 | if (!after_bootmem) |
294 | adjust_range_page_size_mask(mr, nr_range); | |
295 | ||
f765090a | 296 | for (i = 0; i < nr_range; i++) |
365811d6 BH |
297 | printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n", |
298 | mr[i].start, mr[i].end - 1, | |
f765090a PE |
299 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( |
300 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
301 | ||
4e33e065 YL |
302 | return nr_range; |
303 | } | |
304 | ||
0e691cf8 YL |
305 | struct range pfn_mapped[E820_X_MAX]; |
306 | int nr_pfn_mapped; | |
66520ebc JS |
307 | |
308 | static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
309 | { | |
310 | nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX, | |
311 | nr_pfn_mapped, start_pfn, end_pfn); | |
312 | nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX); | |
313 | ||
314 | max_pfn_mapped = max(max_pfn_mapped, end_pfn); | |
315 | ||
316 | if (start_pfn < (1UL<<(32-PAGE_SHIFT))) | |
317 | max_low_pfn_mapped = max(max_low_pfn_mapped, | |
318 | min(end_pfn, 1UL<<(32-PAGE_SHIFT))); | |
319 | } | |
320 | ||
321 | bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
322 | { | |
323 | int i; | |
324 | ||
325 | for (i = 0; i < nr_pfn_mapped; i++) | |
326 | if ((start_pfn >= pfn_mapped[i].start) && | |
327 | (end_pfn <= pfn_mapped[i].end)) | |
328 | return true; | |
329 | ||
330 | return false; | |
331 | } | |
332 | ||
4e33e065 YL |
333 | /* |
334 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
335 | * This runs before bootmem is initialized and gets pages directly from | |
336 | * the physical memory. To access them they are temporarily mapped. | |
337 | */ | |
338 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
339 | unsigned long end) | |
340 | { | |
341 | struct map_range mr[NR_RANGE_MR]; | |
342 | unsigned long ret = 0; | |
343 | int nr_range, i; | |
344 | ||
345 | pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n", | |
346 | start, end - 1); | |
347 | ||
348 | memset(mr, 0, sizeof(mr)); | |
349 | nr_range = split_mem_range(mr, 0, start, end); | |
350 | ||
f765090a PE |
351 | for (i = 0; i < nr_range; i++) |
352 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
353 | mr[i].page_size_mask); | |
f765090a | 354 | |
66520ebc JS |
355 | add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT); |
356 | ||
c14fa0b6 YL |
357 | return ret >> PAGE_SHIFT; |
358 | } | |
359 | ||
66520ebc | 360 | /* |
8d57470d | 361 | * would have hole in the middle or ends, and only ram parts will be mapped. |
66520ebc | 362 | */ |
8d57470d | 363 | static unsigned long __init init_range_memory_mapping( |
b8fd39c0 YL |
364 | unsigned long r_start, |
365 | unsigned long r_end) | |
66520ebc JS |
366 | { |
367 | unsigned long start_pfn, end_pfn; | |
8d57470d | 368 | unsigned long mapped_ram_size = 0; |
66520ebc JS |
369 | int i; |
370 | ||
66520ebc | 371 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { |
b8fd39c0 YL |
372 | u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end); |
373 | u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end); | |
374 | if (start >= end) | |
66520ebc JS |
375 | continue; |
376 | ||
c9b3234a YL |
377 | /* |
378 | * if it is overlapping with brk pgt, we need to | |
379 | * alloc pgt buf from memblock instead. | |
380 | */ | |
381 | can_use_brk_pgt = max(start, (u64)pgt_buf_end<<PAGE_SHIFT) >= | |
382 | min(end, (u64)pgt_buf_top<<PAGE_SHIFT); | |
f763ad1d | 383 | init_memory_mapping(start, end); |
8d57470d | 384 | mapped_ram_size += end - start; |
c9b3234a | 385 | can_use_brk_pgt = true; |
66520ebc | 386 | } |
8d57470d YL |
387 | |
388 | return mapped_ram_size; | |
66520ebc JS |
389 | } |
390 | ||
8d57470d YL |
391 | /* (PUD_SHIFT-PMD_SHIFT)/2 */ |
392 | #define STEP_SIZE_SHIFT 5 | |
c14fa0b6 YL |
393 | void __init init_mem_mapping(void) |
394 | { | |
8d57470d YL |
395 | unsigned long end, real_end, start, last_start; |
396 | unsigned long step_size; | |
397 | unsigned long addr; | |
398 | unsigned long mapped_ram_size = 0; | |
399 | unsigned long new_mapped_ram_size; | |
ab951937 | 400 | |
c14fa0b6 YL |
401 | probe_page_size_mask(); |
402 | ||
c14fa0b6 | 403 | #ifdef CONFIG_X86_64 |
ab951937 | 404 | end = max_pfn << PAGE_SHIFT; |
c14fa0b6 | 405 | #else |
ab951937 | 406 | end = max_low_pfn << PAGE_SHIFT; |
c14fa0b6 | 407 | #endif |
ab951937 | 408 | |
f763ad1d YL |
409 | /* the ISA range is always mapped regardless of memory holes */ |
410 | init_memory_mapping(0, ISA_END_ADDRESS); | |
8d57470d YL |
411 | |
412 | /* xen has big range in reserved near end of ram, skip it at first */ | |
413 | addr = memblock_find_in_range(ISA_END_ADDRESS, end, PMD_SIZE, | |
414 | PAGE_SIZE); | |
415 | real_end = addr + PMD_SIZE; | |
416 | ||
417 | /* step_size need to be small so pgt_buf from BRK could cover it */ | |
418 | step_size = PMD_SIZE; | |
419 | max_pfn_mapped = 0; /* will get exact value next */ | |
420 | min_pfn_mapped = real_end >> PAGE_SHIFT; | |
421 | last_start = start = real_end; | |
422 | while (last_start > ISA_END_ADDRESS) { | |
423 | if (last_start > step_size) { | |
424 | start = round_down(last_start - 1, step_size); | |
425 | if (start < ISA_END_ADDRESS) | |
426 | start = ISA_END_ADDRESS; | |
427 | } else | |
428 | start = ISA_END_ADDRESS; | |
429 | new_mapped_ram_size = init_range_memory_mapping(start, | |
430 | last_start); | |
431 | last_start = start; | |
432 | min_pfn_mapped = last_start >> PAGE_SHIFT; | |
433 | /* only increase step_size after big range get mapped */ | |
434 | if (new_mapped_ram_size > mapped_ram_size) | |
435 | step_size <<= STEP_SIZE_SHIFT; | |
436 | mapped_ram_size += new_mapped_ram_size; | |
437 | } | |
438 | ||
439 | if (real_end < end) | |
440 | init_range_memory_mapping(real_end, end); | |
441 | ||
f763ad1d YL |
442 | #ifdef CONFIG_X86_64 |
443 | if (max_pfn > max_low_pfn) { | |
444 | /* can we preseve max_low_pfn ?*/ | |
445 | max_low_pfn = max_pfn; | |
446 | } | |
719272c4 YL |
447 | #else |
448 | early_ioremap_page_table_range_init(); | |
8170e6be PA |
449 | #endif |
450 | ||
719272c4 YL |
451 | load_cr3(swapper_pg_dir); |
452 | __flush_tlb_all(); | |
719272c4 | 453 | |
c14fa0b6 | 454 | early_memtest(0, max_pfn_mapped << PAGE_SHIFT); |
22ddfcaa | 455 | } |
e5b2bb55 | 456 | |
540aca06 PE |
457 | /* |
458 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
459 | * is valid. The argument is a physical page number. | |
460 | * | |
461 | * | |
462 | * On x86, access has to be given to the first megabyte of ram because that area | |
463 | * contains bios code and data regions used by X and dosemu and similar apps. | |
464 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
465 | * mmio resources as well as potential bios/acpi data regions. | |
466 | */ | |
467 | int devmem_is_allowed(unsigned long pagenr) | |
468 | { | |
73e8f3d7 | 469 | if (pagenr < 256) |
540aca06 PE |
470 | return 1; |
471 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
472 | return 0; | |
473 | if (!page_is_ram(pagenr)) | |
474 | return 1; | |
475 | return 0; | |
476 | } | |
477 | ||
e5b2bb55 PE |
478 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
479 | { | |
c967da6a YL |
480 | unsigned long addr; |
481 | unsigned long begin_aligned, end_aligned; | |
e5b2bb55 | 482 | |
c967da6a YL |
483 | /* Make sure boundaries are page aligned */ |
484 | begin_aligned = PAGE_ALIGN(begin); | |
485 | end_aligned = end & PAGE_MASK; | |
486 | ||
487 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
488 | begin = begin_aligned; | |
489 | end = end_aligned; | |
490 | } | |
491 | ||
492 | if (begin >= end) | |
e5b2bb55 PE |
493 | return; |
494 | ||
c967da6a YL |
495 | addr = begin; |
496 | ||
e5b2bb55 PE |
497 | /* |
498 | * If debugging page accesses then do not free this memory but | |
499 | * mark them not present - any buggy init-section access will | |
500 | * create a kernel page fault: | |
501 | */ | |
502 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
365811d6 BH |
503 | printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n", |
504 | begin, end - 1); | |
e5b2bb55 PE |
505 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
506 | #else | |
507 | /* | |
508 | * We just marked the kernel text read only above, now that | |
509 | * we are going to free part of that, we need to make that | |
5bd5a452 | 510 | * writeable and non-executable first. |
e5b2bb55 | 511 | */ |
5bd5a452 | 512 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); |
e5b2bb55 PE |
513 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); |
514 | ||
515 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
516 | ||
517 | for (; addr < end; addr += PAGE_SIZE) { | |
518 | ClearPageReserved(virt_to_page(addr)); | |
519 | init_page_count(virt_to_page(addr)); | |
c967da6a | 520 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
e5b2bb55 PE |
521 | free_page(addr); |
522 | totalram_pages++; | |
523 | } | |
524 | #endif | |
525 | } | |
526 | ||
527 | void free_initmem(void) | |
528 | { | |
529 | free_init_pages("unused kernel memory", | |
530 | (unsigned long)(&__init_begin), | |
531 | (unsigned long)(&__init_end)); | |
532 | } | |
731ddea6 PE |
533 | |
534 | #ifdef CONFIG_BLK_DEV_INITRD | |
0d26d1d8 | 535 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
731ddea6 | 536 | { |
c967da6a YL |
537 | /* |
538 | * end could be not aligned, and We can not align that, | |
539 | * decompresser could be confused by aligned initrd_end | |
540 | * We already reserve the end partial page before in | |
541 | * - i386_start_kernel() | |
542 | * - x86_64_start_kernel() | |
543 | * - relocate_initrd() | |
544 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
545 | */ | |
546 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
731ddea6 PE |
547 | } |
548 | #endif | |
17623915 PE |
549 | |
550 | void __init zone_sizes_init(void) | |
551 | { | |
552 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
553 | ||
554 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
555 | ||
556 | #ifdef CONFIG_ZONE_DMA | |
557 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
558 | #endif | |
559 | #ifdef CONFIG_ZONE_DMA32 | |
560 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
561 | #endif | |
562 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
563 | #ifdef CONFIG_HIGHMEM | |
564 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; | |
565 | #endif | |
566 | ||
567 | free_area_init_nodes(max_zone_pfns); | |
568 | } | |
569 |