Commit | Line | Data |
---|---|---|
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 */ |
cd745be8 | 19 | #include <asm/microcode.h> |
9518e0e4 | 20 | |
5c51bdbe YL |
21 | #include "mm_internal.h" |
22 | ||
cf470659 YL |
23 | static unsigned long __initdata pgt_buf_start; |
24 | static unsigned long __initdata pgt_buf_end; | |
25 | static unsigned long __initdata pgt_buf_top; | |
f765090a | 26 | |
9985b4c6 YL |
27 | static unsigned long min_pfn_mapped; |
28 | ||
c9b3234a YL |
29 | static bool __initdata can_use_brk_pgt = true; |
30 | ||
ddd3509d SS |
31 | /* |
32 | * Pages returned are already directly mapped. | |
33 | * | |
34 | * Changing that is likely to break Xen, see commit: | |
35 | * | |
36 | * 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve | |
37 | * | |
38 | * for detailed information. | |
39 | */ | |
22c8ca2a | 40 | __ref void *alloc_low_pages(unsigned int num) |
5c51bdbe YL |
41 | { |
42 | unsigned long pfn; | |
22c8ca2a | 43 | int i; |
5c51bdbe | 44 | |
5c51bdbe | 45 | if (after_bootmem) { |
22c8ca2a | 46 | unsigned int order; |
5c51bdbe | 47 | |
22c8ca2a YL |
48 | order = get_order((unsigned long)num << PAGE_SHIFT); |
49 | return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK | | |
50 | __GFP_ZERO, order); | |
5c51bdbe | 51 | } |
5c51bdbe | 52 | |
c9b3234a | 53 | if ((pgt_buf_end + num) > pgt_buf_top || !can_use_brk_pgt) { |
5c51bdbe YL |
54 | unsigned long ret; |
55 | if (min_pfn_mapped >= max_pfn_mapped) | |
56 | panic("alloc_low_page: ran out of memory"); | |
57 | ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT, | |
58 | max_pfn_mapped << PAGE_SHIFT, | |
22c8ca2a | 59 | PAGE_SIZE * num , PAGE_SIZE); |
5c51bdbe YL |
60 | if (!ret) |
61 | panic("alloc_low_page: can not alloc memory"); | |
22c8ca2a | 62 | memblock_reserve(ret, PAGE_SIZE * num); |
5c51bdbe | 63 | pfn = ret >> PAGE_SHIFT; |
22c8ca2a YL |
64 | } else { |
65 | pfn = pgt_buf_end; | |
66 | pgt_buf_end += num; | |
c9b3234a YL |
67 | printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n", |
68 | pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1); | |
22c8ca2a YL |
69 | } |
70 | ||
71 | for (i = 0; i < num; i++) { | |
72 | void *adr; | |
73 | ||
74 | adr = __va((pfn + i) << PAGE_SHIFT); | |
75 | clear_page(adr); | |
76 | } | |
5c51bdbe | 77 | |
22c8ca2a | 78 | return __va(pfn << PAGE_SHIFT); |
5c51bdbe YL |
79 | } |
80 | ||
8d57470d YL |
81 | /* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */ |
82 | #define INIT_PGT_BUF_SIZE (5 * PAGE_SIZE) | |
83 | RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE); | |
84 | void __init early_alloc_pgt_buf(void) | |
85 | { | |
86 | unsigned long tables = INIT_PGT_BUF_SIZE; | |
87 | phys_addr_t base; | |
88 | ||
89 | base = __pa(extend_brk(tables, PAGE_SIZE)); | |
90 | ||
91 | pgt_buf_start = base >> PAGE_SHIFT; | |
92 | pgt_buf_end = pgt_buf_start; | |
93 | pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); | |
94 | } | |
95 | ||
f765090a PE |
96 | int after_bootmem; |
97 | ||
98 | int direct_gbpages | |
99 | #ifdef CONFIG_DIRECT_GBPAGES | |
100 | = 1 | |
101 | #endif | |
102 | ; | |
103 | ||
148b2098 YL |
104 | static void __init init_gbpages(void) |
105 | { | |
106 | #ifdef CONFIG_X86_64 | |
107 | if (direct_gbpages && cpu_has_gbpages) | |
108 | printk(KERN_INFO "Using GB pages for direct mapping\n"); | |
109 | else | |
110 | direct_gbpages = 0; | |
111 | #endif | |
112 | } | |
113 | ||
844ab6f9 JS |
114 | struct map_range { |
115 | unsigned long start; | |
116 | unsigned long end; | |
117 | unsigned page_size_mask; | |
118 | }; | |
119 | ||
fa62aafe | 120 | static int page_size_mask; |
f765090a | 121 | |
22ddfcaa | 122 | static void __init probe_page_size_mask(void) |
fa62aafe | 123 | { |
148b2098 YL |
124 | init_gbpages(); |
125 | ||
fa62aafe YL |
126 | #if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK) |
127 | /* | |
128 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. | |
129 | * This will simplify cpa(), which otherwise needs to support splitting | |
130 | * large pages into small in interrupt context, etc. | |
131 | */ | |
132 | if (direct_gbpages) | |
133 | page_size_mask |= 1 << PG_LEVEL_1G; | |
134 | if (cpu_has_pse) | |
135 | page_size_mask |= 1 << PG_LEVEL_2M; | |
136 | #endif | |
137 | ||
138 | /* Enable PSE if available */ | |
139 | if (cpu_has_pse) | |
140 | set_in_cr4(X86_CR4_PSE); | |
141 | ||
142 | /* Enable PGE if available */ | |
143 | if (cpu_has_pge) { | |
144 | set_in_cr4(X86_CR4_PGE); | |
145 | __supported_pte_mask |= _PAGE_GLOBAL; | |
146 | } | |
147 | } | |
279b706b | 148 | |
f765090a PE |
149 | #ifdef CONFIG_X86_32 |
150 | #define NR_RANGE_MR 3 | |
151 | #else /* CONFIG_X86_64 */ | |
152 | #define NR_RANGE_MR 5 | |
153 | #endif | |
154 | ||
dc9dd5cc JB |
155 | static int __meminit save_mr(struct map_range *mr, int nr_range, |
156 | unsigned long start_pfn, unsigned long end_pfn, | |
157 | unsigned long page_size_mask) | |
f765090a PE |
158 | { |
159 | if (start_pfn < end_pfn) { | |
160 | if (nr_range >= NR_RANGE_MR) | |
161 | panic("run out of range for init_memory_mapping\n"); | |
162 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; | |
163 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; | |
164 | mr[nr_range].page_size_mask = page_size_mask; | |
165 | nr_range++; | |
166 | } | |
167 | ||
168 | return nr_range; | |
169 | } | |
170 | ||
aeebe84c YL |
171 | /* |
172 | * adjust the page_size_mask for small range to go with | |
173 | * big page size instead small one if nearby are ram too. | |
174 | */ | |
175 | static void __init_refok adjust_range_page_size_mask(struct map_range *mr, | |
176 | int nr_range) | |
177 | { | |
178 | int i; | |
179 | ||
180 | for (i = 0; i < nr_range; i++) { | |
181 | if ((page_size_mask & (1<<PG_LEVEL_2M)) && | |
182 | !(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) { | |
183 | unsigned long start = round_down(mr[i].start, PMD_SIZE); | |
184 | unsigned long end = round_up(mr[i].end, PMD_SIZE); | |
185 | ||
186 | #ifdef CONFIG_X86_32 | |
187 | if ((end >> PAGE_SHIFT) > max_low_pfn) | |
188 | continue; | |
189 | #endif | |
190 | ||
191 | if (memblock_is_region_memory(start, end - start)) | |
192 | mr[i].page_size_mask |= 1<<PG_LEVEL_2M; | |
193 | } | |
194 | if ((page_size_mask & (1<<PG_LEVEL_1G)) && | |
195 | !(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) { | |
196 | unsigned long start = round_down(mr[i].start, PUD_SIZE); | |
197 | unsigned long end = round_up(mr[i].end, PUD_SIZE); | |
198 | ||
199 | if (memblock_is_region_memory(start, end - start)) | |
200 | mr[i].page_size_mask |= 1<<PG_LEVEL_1G; | |
201 | } | |
202 | } | |
203 | } | |
204 | ||
4e33e065 YL |
205 | static int __meminit split_mem_range(struct map_range *mr, int nr_range, |
206 | unsigned long start, | |
207 | unsigned long end) | |
f765090a | 208 | { |
2e8059ed | 209 | unsigned long start_pfn, end_pfn, limit_pfn; |
1829ae9a | 210 | unsigned long pfn; |
4e33e065 | 211 | int i; |
f765090a | 212 | |
2e8059ed YL |
213 | limit_pfn = PFN_DOWN(end); |
214 | ||
f765090a | 215 | /* head if not big page alignment ? */ |
1829ae9a | 216 | pfn = start_pfn = PFN_DOWN(start); |
f765090a PE |
217 | #ifdef CONFIG_X86_32 |
218 | /* | |
219 | * Don't use a large page for the first 2/4MB of memory | |
220 | * because there are often fixed size MTRRs in there | |
221 | * and overlapping MTRRs into large pages can cause | |
222 | * slowdowns. | |
223 | */ | |
1829ae9a | 224 | if (pfn == 0) |
84d77001 | 225 | end_pfn = PFN_DOWN(PMD_SIZE); |
f765090a | 226 | else |
1829ae9a | 227 | end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 228 | #else /* CONFIG_X86_64 */ |
1829ae9a | 229 | end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 230 | #endif |
2e8059ed YL |
231 | if (end_pfn > limit_pfn) |
232 | end_pfn = limit_pfn; | |
f765090a PE |
233 | if (start_pfn < end_pfn) { |
234 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); | |
1829ae9a | 235 | pfn = end_pfn; |
f765090a PE |
236 | } |
237 | ||
238 | /* big page (2M) range */ | |
1829ae9a | 239 | start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 240 | #ifdef CONFIG_X86_32 |
2e8059ed | 241 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); |
f765090a | 242 | #else /* CONFIG_X86_64 */ |
1829ae9a | 243 | end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); |
2e8059ed YL |
244 | if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE))) |
245 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); | |
f765090a PE |
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)); | |
1829ae9a | 251 | pfn = end_pfn; |
f765090a PE |
252 | } |
253 | ||
254 | #ifdef CONFIG_X86_64 | |
255 | /* big page (1G) range */ | |
1829ae9a | 256 | start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); |
2e8059ed | 257 | end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE)); |
f765090a PE |
258 | if (start_pfn < end_pfn) { |
259 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
260 | page_size_mask & | |
261 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); | |
1829ae9a | 262 | pfn = end_pfn; |
f765090a PE |
263 | } |
264 | ||
265 | /* tail is not big page (1G) alignment */ | |
1829ae9a | 266 | start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); |
2e8059ed | 267 | end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE)); |
f765090a PE |
268 | if (start_pfn < end_pfn) { |
269 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, | |
270 | page_size_mask & (1<<PG_LEVEL_2M)); | |
1829ae9a | 271 | pfn = end_pfn; |
f765090a PE |
272 | } |
273 | #endif | |
274 | ||
275 | /* tail is not big page (2M) alignment */ | |
1829ae9a | 276 | start_pfn = pfn; |
2e8059ed | 277 | end_pfn = limit_pfn; |
f765090a PE |
278 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
279 | ||
280 | /* try to merge same page size and continuous */ | |
281 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { | |
282 | unsigned long old_start; | |
283 | if (mr[i].end != mr[i+1].start || | |
284 | mr[i].page_size_mask != mr[i+1].page_size_mask) | |
285 | continue; | |
286 | /* move it */ | |
287 | old_start = mr[i].start; | |
288 | memmove(&mr[i], &mr[i+1], | |
289 | (nr_range - 1 - i) * sizeof(struct map_range)); | |
290 | mr[i--].start = old_start; | |
291 | nr_range--; | |
292 | } | |
293 | ||
aeebe84c YL |
294 | if (!after_bootmem) |
295 | adjust_range_page_size_mask(mr, nr_range); | |
296 | ||
f765090a | 297 | for (i = 0; i < nr_range; i++) |
365811d6 BH |
298 | printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n", |
299 | mr[i].start, mr[i].end - 1, | |
f765090a PE |
300 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( |
301 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); | |
302 | ||
4e33e065 YL |
303 | return nr_range; |
304 | } | |
305 | ||
0e691cf8 YL |
306 | struct range pfn_mapped[E820_X_MAX]; |
307 | int nr_pfn_mapped; | |
66520ebc JS |
308 | |
309 | static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
310 | { | |
311 | nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX, | |
312 | nr_pfn_mapped, start_pfn, end_pfn); | |
313 | nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX); | |
314 | ||
315 | max_pfn_mapped = max(max_pfn_mapped, end_pfn); | |
316 | ||
317 | if (start_pfn < (1UL<<(32-PAGE_SHIFT))) | |
318 | max_low_pfn_mapped = max(max_low_pfn_mapped, | |
319 | min(end_pfn, 1UL<<(32-PAGE_SHIFT))); | |
320 | } | |
321 | ||
322 | bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn) | |
323 | { | |
324 | int i; | |
325 | ||
326 | for (i = 0; i < nr_pfn_mapped; i++) | |
327 | if ((start_pfn >= pfn_mapped[i].start) && | |
328 | (end_pfn <= pfn_mapped[i].end)) | |
329 | return true; | |
330 | ||
331 | return false; | |
332 | } | |
333 | ||
4e33e065 YL |
334 | /* |
335 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
336 | * This runs before bootmem is initialized and gets pages directly from | |
337 | * the physical memory. To access them they are temporarily mapped. | |
338 | */ | |
339 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
340 | unsigned long end) | |
341 | { | |
342 | struct map_range mr[NR_RANGE_MR]; | |
343 | unsigned long ret = 0; | |
344 | int nr_range, i; | |
345 | ||
346 | pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n", | |
347 | start, end - 1); | |
348 | ||
349 | memset(mr, 0, sizeof(mr)); | |
350 | nr_range = split_mem_range(mr, 0, start, end); | |
351 | ||
f765090a PE |
352 | for (i = 0; i < nr_range; i++) |
353 | ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, | |
354 | mr[i].page_size_mask); | |
f765090a | 355 | |
66520ebc JS |
356 | add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT); |
357 | ||
c14fa0b6 YL |
358 | return ret >> PAGE_SHIFT; |
359 | } | |
360 | ||
66520ebc | 361 | /* |
8d57470d | 362 | * would have hole in the middle or ends, and only ram parts will be mapped. |
66520ebc | 363 | */ |
8d57470d | 364 | static unsigned long __init init_range_memory_mapping( |
b8fd39c0 YL |
365 | unsigned long r_start, |
366 | unsigned long r_end) | |
66520ebc JS |
367 | { |
368 | unsigned long start_pfn, end_pfn; | |
8d57470d | 369 | unsigned long mapped_ram_size = 0; |
66520ebc JS |
370 | int i; |
371 | ||
66520ebc | 372 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { |
b8fd39c0 YL |
373 | u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end); |
374 | u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end); | |
375 | if (start >= end) | |
66520ebc JS |
376 | continue; |
377 | ||
c9b3234a YL |
378 | /* |
379 | * if it is overlapping with brk pgt, we need to | |
380 | * alloc pgt buf from memblock instead. | |
381 | */ | |
382 | can_use_brk_pgt = max(start, (u64)pgt_buf_end<<PAGE_SHIFT) >= | |
383 | min(end, (u64)pgt_buf_top<<PAGE_SHIFT); | |
f763ad1d | 384 | init_memory_mapping(start, end); |
8d57470d | 385 | mapped_ram_size += end - start; |
c9b3234a | 386 | can_use_brk_pgt = true; |
66520ebc | 387 | } |
8d57470d YL |
388 | |
389 | return mapped_ram_size; | |
66520ebc JS |
390 | } |
391 | ||
8d57470d YL |
392 | /* (PUD_SHIFT-PMD_SHIFT)/2 */ |
393 | #define STEP_SIZE_SHIFT 5 | |
c14fa0b6 YL |
394 | void __init init_mem_mapping(void) |
395 | { | |
8d57470d YL |
396 | unsigned long end, real_end, start, last_start; |
397 | unsigned long step_size; | |
398 | unsigned long addr; | |
399 | unsigned long mapped_ram_size = 0; | |
400 | unsigned long new_mapped_ram_size; | |
ab951937 | 401 | |
c14fa0b6 YL |
402 | probe_page_size_mask(); |
403 | ||
c14fa0b6 | 404 | #ifdef CONFIG_X86_64 |
ab951937 | 405 | end = max_pfn << PAGE_SHIFT; |
c14fa0b6 | 406 | #else |
ab951937 | 407 | end = max_low_pfn << PAGE_SHIFT; |
c14fa0b6 | 408 | #endif |
ab951937 | 409 | |
f763ad1d YL |
410 | /* the ISA range is always mapped regardless of memory holes */ |
411 | init_memory_mapping(0, ISA_END_ADDRESS); | |
8d57470d YL |
412 | |
413 | /* xen has big range in reserved near end of ram, skip it at first */ | |
414 | addr = memblock_find_in_range(ISA_END_ADDRESS, end, PMD_SIZE, | |
415 | PAGE_SIZE); | |
416 | real_end = addr + PMD_SIZE; | |
417 | ||
418 | /* step_size need to be small so pgt_buf from BRK could cover it */ | |
419 | step_size = PMD_SIZE; | |
420 | max_pfn_mapped = 0; /* will get exact value next */ | |
421 | min_pfn_mapped = real_end >> PAGE_SHIFT; | |
422 | last_start = start = real_end; | |
423 | while (last_start > ISA_END_ADDRESS) { | |
424 | if (last_start > step_size) { | |
425 | start = round_down(last_start - 1, step_size); | |
426 | if (start < ISA_END_ADDRESS) | |
427 | start = ISA_END_ADDRESS; | |
428 | } else | |
429 | start = ISA_END_ADDRESS; | |
430 | new_mapped_ram_size = init_range_memory_mapping(start, | |
431 | last_start); | |
432 | last_start = start; | |
433 | min_pfn_mapped = last_start >> PAGE_SHIFT; | |
434 | /* only increase step_size after big range get mapped */ | |
435 | if (new_mapped_ram_size > mapped_ram_size) | |
436 | step_size <<= STEP_SIZE_SHIFT; | |
437 | mapped_ram_size += new_mapped_ram_size; | |
438 | } | |
439 | ||
440 | if (real_end < end) | |
441 | init_range_memory_mapping(real_end, end); | |
442 | ||
f763ad1d YL |
443 | #ifdef CONFIG_X86_64 |
444 | if (max_pfn > max_low_pfn) { | |
445 | /* can we preseve max_low_pfn ?*/ | |
446 | max_low_pfn = max_pfn; | |
447 | } | |
719272c4 YL |
448 | #else |
449 | early_ioremap_page_table_range_init(); | |
8170e6be PA |
450 | #endif |
451 | ||
719272c4 YL |
452 | load_cr3(swapper_pg_dir); |
453 | __flush_tlb_all(); | |
719272c4 | 454 | |
c14fa0b6 | 455 | early_memtest(0, max_pfn_mapped << PAGE_SHIFT); |
22ddfcaa | 456 | } |
e5b2bb55 | 457 | |
540aca06 PE |
458 | /* |
459 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
460 | * is valid. The argument is a physical page number. | |
461 | * | |
462 | * | |
463 | * On x86, access has to be given to the first megabyte of ram because that area | |
464 | * contains bios code and data regions used by X and dosemu and similar apps. | |
465 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
466 | * mmio resources as well as potential bios/acpi data regions. | |
467 | */ | |
468 | int devmem_is_allowed(unsigned long pagenr) | |
469 | { | |
73e8f3d7 | 470 | if (pagenr < 256) |
540aca06 PE |
471 | return 1; |
472 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) | |
473 | return 0; | |
474 | if (!page_is_ram(pagenr)) | |
475 | return 1; | |
476 | return 0; | |
477 | } | |
478 | ||
e5b2bb55 PE |
479 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
480 | { | |
c967da6a YL |
481 | unsigned long addr; |
482 | unsigned long begin_aligned, end_aligned; | |
e5b2bb55 | 483 | |
c967da6a YL |
484 | /* Make sure boundaries are page aligned */ |
485 | begin_aligned = PAGE_ALIGN(begin); | |
486 | end_aligned = end & PAGE_MASK; | |
487 | ||
488 | if (WARN_ON(begin_aligned != begin || end_aligned != end)) { | |
489 | begin = begin_aligned; | |
490 | end = end_aligned; | |
491 | } | |
492 | ||
493 | if (begin >= end) | |
e5b2bb55 PE |
494 | return; |
495 | ||
c967da6a YL |
496 | addr = begin; |
497 | ||
e5b2bb55 PE |
498 | /* |
499 | * If debugging page accesses then do not free this memory but | |
500 | * mark them not present - any buggy init-section access will | |
501 | * create a kernel page fault: | |
502 | */ | |
503 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
365811d6 BH |
504 | printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n", |
505 | begin, end - 1); | |
e5b2bb55 PE |
506 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
507 | #else | |
508 | /* | |
509 | * We just marked the kernel text read only above, now that | |
510 | * we are going to free part of that, we need to make that | |
5bd5a452 | 511 | * writeable and non-executable first. |
e5b2bb55 | 512 | */ |
5bd5a452 | 513 | set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); |
e5b2bb55 PE |
514 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); |
515 | ||
516 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
517 | ||
518 | for (; addr < end; addr += PAGE_SIZE) { | |
519 | ClearPageReserved(virt_to_page(addr)); | |
520 | init_page_count(virt_to_page(addr)); | |
c967da6a | 521 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
e5b2bb55 PE |
522 | free_page(addr); |
523 | totalram_pages++; | |
524 | } | |
525 | #endif | |
526 | } | |
527 | ||
528 | void free_initmem(void) | |
529 | { | |
530 | free_init_pages("unused kernel memory", | |
531 | (unsigned long)(&__init_begin), | |
532 | (unsigned long)(&__init_end)); | |
533 | } | |
731ddea6 PE |
534 | |
535 | #ifdef CONFIG_BLK_DEV_INITRD | |
0d26d1d8 | 536 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
731ddea6 | 537 | { |
cd745be8 FY |
538 | #ifdef CONFIG_MICROCODE_EARLY |
539 | /* | |
540 | * Remember, initrd memory may contain microcode or other useful things. | |
541 | * Before we lose initrd mem, we need to find a place to hold them | |
542 | * now that normal virtual memory is enabled. | |
543 | */ | |
544 | save_microcode_in_initrd(); | |
545 | #endif | |
546 | ||
c967da6a YL |
547 | /* |
548 | * end could be not aligned, and We can not align that, | |
549 | * decompresser could be confused by aligned initrd_end | |
550 | * We already reserve the end partial page before in | |
551 | * - i386_start_kernel() | |
552 | * - x86_64_start_kernel() | |
553 | * - relocate_initrd() | |
554 | * So here We can do PAGE_ALIGN() safely to get partial page to be freed | |
555 | */ | |
556 | free_init_pages("initrd memory", start, PAGE_ALIGN(end)); | |
731ddea6 PE |
557 | } |
558 | #endif | |
17623915 PE |
559 | |
560 | void __init zone_sizes_init(void) | |
561 | { | |
562 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
563 | ||
564 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
565 | ||
566 | #ifdef CONFIG_ZONE_DMA | |
567 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
568 | #endif | |
569 | #ifdef CONFIG_ZONE_DMA32 | |
570 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
571 | #endif | |
572 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
573 | #ifdef CONFIG_HIGHMEM | |
574 | max_zone_pfns[ZONE_HIGHMEM] = max_pfn; | |
575 | #endif | |
576 | ||
577 | free_area_init_nodes(max_zone_pfns); | |
578 | } | |
579 |