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>
7#include <linux/swapfile.h>
8#include <linux/swapops.h>
9
10#include <asm/set_memory.h>
11#include <asm/e820/api.h>
12#include <asm/init.h>
13#include <asm/page.h>
14#include <asm/page_types.h>
15#include <asm/sections.h>
16#include <asm/setup.h>
17#include <asm/tlbflush.h>
18#include <asm/tlb.h>
19#include <asm/proto.h>
20#include <asm/dma.h>
21#include <asm/microcode.h>
22#include <asm/kaslr.h>
23#include <asm/hypervisor.h>
24#include <asm/cpufeature.h>
25#include <asm/pti.h>
26
27
28
29
30
31#define CREATE_TRACE_POINTS
32#include <trace/events/tlb.h>
33
34#include "mm_internal.h"
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM] = {
51 [_PAGE_CACHE_MODE_WB ] = 0 | 0 ,
52 [_PAGE_CACHE_MODE_WC ] = 0 | _PAGE_PCD,
53 [_PAGE_CACHE_MODE_UC_MINUS] = 0 | _PAGE_PCD,
54 [_PAGE_CACHE_MODE_UC ] = _PAGE_PWT | _PAGE_PCD,
55 [_PAGE_CACHE_MODE_WT ] = 0 | _PAGE_PCD,
56 [_PAGE_CACHE_MODE_WP ] = 0 | _PAGE_PCD,
57};
58EXPORT_SYMBOL(__cachemode2pte_tbl);
59
60uint8_t __pte2cachemode_tbl[8] = {
61 [__pte2cm_idx( 0 | 0 | 0 )] = _PAGE_CACHE_MODE_WB,
62 [__pte2cm_idx(_PAGE_PWT | 0 | 0 )] = _PAGE_CACHE_MODE_UC_MINUS,
63 [__pte2cm_idx( 0 | _PAGE_PCD | 0 )] = _PAGE_CACHE_MODE_UC_MINUS,
64 [__pte2cm_idx(_PAGE_PWT | _PAGE_PCD | 0 )] = _PAGE_CACHE_MODE_UC,
65 [__pte2cm_idx( 0 | 0 | _PAGE_PAT)] = _PAGE_CACHE_MODE_WB,
66 [__pte2cm_idx(_PAGE_PWT | 0 | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC_MINUS,
67 [__pte2cm_idx(0 | _PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC_MINUS,
68 [__pte2cm_idx(_PAGE_PWT | _PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC,
69};
70EXPORT_SYMBOL(__pte2cachemode_tbl);
71
72static unsigned long __initdata pgt_buf_start;
73static unsigned long __initdata pgt_buf_end;
74static unsigned long __initdata pgt_buf_top;
75
76static unsigned long min_pfn_mapped;
77
78static bool __initdata can_use_brk_pgt = true;
79
80
81
82
83
84
85
86
87
88
89__ref void *alloc_low_pages(unsigned int num)
90{
91 unsigned long pfn;
92 int i;
93
94 if (after_bootmem) {
95 unsigned int order;
96
97 order = get_order((unsigned long)num << PAGE_SHIFT);
98 return (void *)__get_free_pages(GFP_ATOMIC | __GFP_ZERO, order);
99 }
100
101 if ((pgt_buf_end + num) > pgt_buf_top || !can_use_brk_pgt) {
102 unsigned long ret = 0;
103
104 if (min_pfn_mapped < max_pfn_mapped) {
105 ret = memblock_find_in_range(
106 min_pfn_mapped << PAGE_SHIFT,
107 max_pfn_mapped << PAGE_SHIFT,
108 PAGE_SIZE * num , PAGE_SIZE);
109 }
110 if (ret)
111 memblock_reserve(ret, PAGE_SIZE * num);
112 else if (can_use_brk_pgt)
113 ret = __pa(extend_brk(PAGE_SIZE * num, PAGE_SIZE));
114
115 if (!ret)
116 panic("alloc_low_pages: can not alloc memory");
117
118 pfn = ret >> PAGE_SHIFT;
119 } else {
120 pfn = pgt_buf_end;
121 pgt_buf_end += num;
122 printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n",
123 pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1);
124 }
125
126 for (i = 0; i < num; i++) {
127 void *adr;
128
129 adr = __va((pfn + i) << PAGE_SHIFT);
130 clear_page(adr);
131 }
132
133 return __va(pfn << PAGE_SHIFT);
134}
135
136
137
138
139
140
141
142#ifndef CONFIG_RANDOMIZE_MEMORY
143#define INIT_PGD_PAGE_COUNT 6
144#else
145#define INIT_PGD_PAGE_COUNT 12
146#endif
147#define INIT_PGT_BUF_SIZE (INIT_PGD_PAGE_COUNT * PAGE_SIZE)
148RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE);
149void __init early_alloc_pgt_buf(void)
150{
151 unsigned long tables = INIT_PGT_BUF_SIZE;
152 phys_addr_t base;
153
154 base = __pa(extend_brk(tables, PAGE_SIZE));
155
156 pgt_buf_start = base >> PAGE_SHIFT;
157 pgt_buf_end = pgt_buf_start;
158 pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);
159}
160
161int after_bootmem;
162
163early_param_on_off("gbpages", "nogbpages", direct_gbpages, CONFIG_X86_DIRECT_GBPAGES);
164
165struct map_range {
166 unsigned long start;
167 unsigned long end;
168 unsigned page_size_mask;
169};
170
171static int page_size_mask;
172
173static void __init probe_page_size_mask(void)
174{
175
176
177
178
179
180 if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled())
181 page_size_mask |= 1 << PG_LEVEL_2M;
182 else
183 direct_gbpages = 0;
184
185
186 if (boot_cpu_has(X86_FEATURE_PSE))
187 cr4_set_bits_and_update_boot(X86_CR4_PSE);
188
189
190 __supported_pte_mask &= ~_PAGE_GLOBAL;
191 if (boot_cpu_has(X86_FEATURE_PGE)) {
192 cr4_set_bits_and_update_boot(X86_CR4_PGE);
193 __supported_pte_mask |= _PAGE_GLOBAL;
194 }
195
196
197 __default_kernel_pte_mask = __supported_pte_mask;
198
199 if (cpu_feature_enabled(X86_FEATURE_PTI))
200 __default_kernel_pte_mask &= ~_PAGE_GLOBAL;
201
202
203 if (direct_gbpages && boot_cpu_has(X86_FEATURE_GBPAGES)) {
204 printk(KERN_INFO "Using GB pages for direct mapping\n");
205 page_size_mask |= 1 << PG_LEVEL_1G;
206 } else {
207 direct_gbpages = 0;
208 }
209}
210
211static void setup_pcid(void)
212{
213 if (!IS_ENABLED(CONFIG_X86_64))
214 return;
215
216 if (!boot_cpu_has(X86_FEATURE_PCID))
217 return;
218
219 if (boot_cpu_has(X86_FEATURE_PGE)) {
220
221
222
223
224
225
226
227
228
229
230
231 cr4_set_bits(X86_CR4_PCIDE);
232
233
234
235
236
237
238
239 if (boot_cpu_has(X86_FEATURE_INVPCID))
240 setup_force_cpu_cap(X86_FEATURE_INVPCID_SINGLE);
241 } else {
242
243
244
245
246
247
248
249 setup_clear_cpu_cap(X86_FEATURE_PCID);
250 }
251}
252
253#ifdef CONFIG_X86_32
254#define NR_RANGE_MR 3
255#else
256#define NR_RANGE_MR 5
257#endif
258
259static int __meminit save_mr(struct map_range *mr, int nr_range,
260 unsigned long start_pfn, unsigned long end_pfn,
261 unsigned long page_size_mask)
262{
263 if (start_pfn < end_pfn) {
264 if (nr_range >= NR_RANGE_MR)
265 panic("run out of range for init_memory_mapping\n");
266 mr[nr_range].start = start_pfn<<PAGE_SHIFT;
267 mr[nr_range].end = end_pfn<<PAGE_SHIFT;
268 mr[nr_range].page_size_mask = page_size_mask;
269 nr_range++;
270 }
271
272 return nr_range;
273}
274
275
276
277
278
279static void __ref adjust_range_page_size_mask(struct map_range *mr,
280 int nr_range)
281{
282 int i;
283
284 for (i = 0; i < nr_range; i++) {
285 if ((page_size_mask & (1<<PG_LEVEL_2M)) &&
286 !(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) {
287 unsigned long start = round_down(mr[i].start, PMD_SIZE);
288 unsigned long end = round_up(mr[i].end, PMD_SIZE);
289
290#ifdef CONFIG_X86_32
291 if ((end >> PAGE_SHIFT) > max_low_pfn)
292 continue;
293#endif
294
295 if (memblock_is_region_memory(start, end - start))
296 mr[i].page_size_mask |= 1<<PG_LEVEL_2M;
297 }
298 if ((page_size_mask & (1<<PG_LEVEL_1G)) &&
299 !(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) {
300 unsigned long start = round_down(mr[i].start, PUD_SIZE);
301 unsigned long end = round_up(mr[i].end, PUD_SIZE);
302
303 if (memblock_is_region_memory(start, end - start))
304 mr[i].page_size_mask |= 1<<PG_LEVEL_1G;
305 }
306 }
307}
308
309static const char *page_size_string(struct map_range *mr)
310{
311 static const char str_1g[] = "1G";
312 static const char str_2m[] = "2M";
313 static const char str_4m[] = "4M";
314 static const char str_4k[] = "4k";
315
316 if (mr->page_size_mask & (1<<PG_LEVEL_1G))
317 return str_1g;
318
319
320
321
322
323 if (IS_ENABLED(CONFIG_X86_32) &&
324 !IS_ENABLED(CONFIG_X86_PAE) &&
325 mr->page_size_mask & (1<<PG_LEVEL_2M))
326 return str_4m;
327
328 if (mr->page_size_mask & (1<<PG_LEVEL_2M))
329 return str_2m;
330
331 return str_4k;
332}
333
334static int __meminit split_mem_range(struct map_range *mr, int nr_range,
335 unsigned long start,
336 unsigned long end)
337{
338 unsigned long start_pfn, end_pfn, limit_pfn;
339 unsigned long pfn;
340 int i;
341
342 limit_pfn = PFN_DOWN(end);
343
344
345 pfn = start_pfn = PFN_DOWN(start);
346#ifdef CONFIG_X86_32
347
348
349
350
351
352
353 if (pfn == 0)
354 end_pfn = PFN_DOWN(PMD_SIZE);
355 else
356 end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
357#else
358 end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
359#endif
360 if (end_pfn > limit_pfn)
361 end_pfn = limit_pfn;
362 if (start_pfn < end_pfn) {
363 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
364 pfn = end_pfn;
365 }
366
367
368 start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
369#ifdef CONFIG_X86_32
370 end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
371#else
372 end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
373 if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE)))
374 end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
375#endif
376
377 if (start_pfn < end_pfn) {
378 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
379 page_size_mask & (1<<PG_LEVEL_2M));
380 pfn = end_pfn;
381 }
382
383#ifdef CONFIG_X86_64
384
385 start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
386 end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE));
387 if (start_pfn < end_pfn) {
388 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
389 page_size_mask &
390 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
391 pfn = end_pfn;
392 }
393
394
395 start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
396 end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
397 if (start_pfn < end_pfn) {
398 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
399 page_size_mask & (1<<PG_LEVEL_2M));
400 pfn = end_pfn;
401 }
402#endif
403
404
405 start_pfn = pfn;
406 end_pfn = limit_pfn;
407 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
408
409 if (!after_bootmem)
410 adjust_range_page_size_mask(mr, nr_range);
411
412
413 for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
414 unsigned long old_start;
415 if (mr[i].end != mr[i+1].start ||
416 mr[i].page_size_mask != mr[i+1].page_size_mask)
417 continue;
418
419 old_start = mr[i].start;
420 memmove(&mr[i], &mr[i+1],
421 (nr_range - 1 - i) * sizeof(struct map_range));
422 mr[i--].start = old_start;
423 nr_range--;
424 }
425
426 for (i = 0; i < nr_range; i++)
427 pr_debug(" [mem %#010lx-%#010lx] page %s\n",
428 mr[i].start, mr[i].end - 1,
429 page_size_string(&mr[i]));
430
431 return nr_range;
432}
433
434struct range pfn_mapped[E820_MAX_ENTRIES];
435int nr_pfn_mapped;
436
437static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn)
438{
439 nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_MAX_ENTRIES,
440 nr_pfn_mapped, start_pfn, end_pfn);
441 nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_MAX_ENTRIES);
442
443 max_pfn_mapped = max(max_pfn_mapped, end_pfn);
444
445 if (start_pfn < (1UL<<(32-PAGE_SHIFT)))
446 max_low_pfn_mapped = max(max_low_pfn_mapped,
447 min(end_pfn, 1UL<<(32-PAGE_SHIFT)));
448}
449
450bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn)
451{
452 int i;
453
454 for (i = 0; i < nr_pfn_mapped; i++)
455 if ((start_pfn >= pfn_mapped[i].start) &&
456 (end_pfn <= pfn_mapped[i].end))
457 return true;
458
459 return false;
460}
461
462
463
464
465
466
467unsigned long __ref init_memory_mapping(unsigned long start,
468 unsigned long end)
469{
470 struct map_range mr[NR_RANGE_MR];
471 unsigned long ret = 0;
472 int nr_range, i;
473
474 pr_debug("init_memory_mapping: [mem %#010lx-%#010lx]\n",
475 start, end - 1);
476
477 memset(mr, 0, sizeof(mr));
478 nr_range = split_mem_range(mr, 0, start, end);
479
480 for (i = 0; i < nr_range; i++)
481 ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
482 mr[i].page_size_mask);
483
484 add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT);
485
486 return ret >> PAGE_SHIFT;
487}
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502static unsigned long __init init_range_memory_mapping(
503 unsigned long r_start,
504 unsigned long r_end)
505{
506 unsigned long start_pfn, end_pfn;
507 unsigned long mapped_ram_size = 0;
508 int i;
509
510 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
511 u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end);
512 u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end);
513 if (start >= end)
514 continue;
515
516
517
518
519
520 can_use_brk_pgt = max(start, (u64)pgt_buf_end<<PAGE_SHIFT) >=
521 min(end, (u64)pgt_buf_top<<PAGE_SHIFT);
522 init_memory_mapping(start, end);
523 mapped_ram_size += end - start;
524 can_use_brk_pgt = true;
525 }
526
527 return mapped_ram_size;
528}
529
530static unsigned long __init get_new_step_size(unsigned long step_size)
531{
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546 return step_size << (PMD_SHIFT - PAGE_SHIFT - 1);
547}
548
549
550
551
552
553
554
555
556
557
558
559static void __init memory_map_top_down(unsigned long map_start,
560 unsigned long map_end)
561{
562 unsigned long real_end, start, last_start;
563 unsigned long step_size;
564 unsigned long addr;
565 unsigned long mapped_ram_size = 0;
566
567
568 addr = memblock_find_in_range(map_start, map_end, PMD_SIZE, PMD_SIZE);
569 real_end = addr + PMD_SIZE;
570
571
572 step_size = PMD_SIZE;
573 max_pfn_mapped = 0;
574 min_pfn_mapped = real_end >> PAGE_SHIFT;
575 last_start = start = real_end;
576
577
578
579
580
581
582
583 while (last_start > map_start) {
584 if (last_start > step_size) {
585 start = round_down(last_start - 1, step_size);
586 if (start < map_start)
587 start = map_start;
588 } else
589 start = map_start;
590 mapped_ram_size += init_range_memory_mapping(start,
591 last_start);
592 last_start = start;
593 min_pfn_mapped = last_start >> PAGE_SHIFT;
594 if (mapped_ram_size >= step_size)
595 step_size = get_new_step_size(step_size);
596 }
597
598 if (real_end < map_end)
599 init_range_memory_mapping(real_end, map_end);
600}
601
602
603
604
605
606
607
608
609
610
611
612
613static void __init memory_map_bottom_up(unsigned long map_start,
614 unsigned long map_end)
615{
616 unsigned long next, start;
617 unsigned long mapped_ram_size = 0;
618
619 unsigned long step_size = PMD_SIZE;
620
621 start = map_start;
622 min_pfn_mapped = start >> PAGE_SHIFT;
623
624
625
626
627
628
629
630 while (start < map_end) {
631 if (step_size && map_end - start > step_size) {
632 next = round_up(start + 1, step_size);
633 if (next > map_end)
634 next = map_end;
635 } else {
636 next = map_end;
637 }
638
639 mapped_ram_size += init_range_memory_mapping(start, next);
640 start = next;
641
642 if (mapped_ram_size >= step_size)
643 step_size = get_new_step_size(step_size);
644 }
645}
646
647void __init init_mem_mapping(void)
648{
649 unsigned long end;
650
651 pti_check_boottime_disable();
652 probe_page_size_mask();
653 setup_pcid();
654
655#ifdef CONFIG_X86_64
656 end = max_pfn << PAGE_SHIFT;
657#else
658 end = max_low_pfn << PAGE_SHIFT;
659#endif
660
661
662 init_memory_mapping(0, ISA_END_ADDRESS);
663
664
665 init_trampoline();
666
667
668
669
670
671 if (memblock_bottom_up()) {
672 unsigned long kernel_end = __pa_symbol(_end);
673
674
675
676
677
678
679
680
681 memory_map_bottom_up(kernel_end, end);
682 memory_map_bottom_up(ISA_END_ADDRESS, kernel_end);
683 } else {
684 memory_map_top_down(ISA_END_ADDRESS, end);
685 }
686
687#ifdef CONFIG_X86_64
688 if (max_pfn > max_low_pfn) {
689
690 max_low_pfn = max_pfn;
691 }
692#else
693 early_ioremap_page_table_range_init();
694#endif
695
696 load_cr3(swapper_pg_dir);
697 __flush_tlb_all();
698
699 x86_init.hyper.init_mem_mapping();
700
701 early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
702}
703
704
705
706
707
708
709
710
711
712
713
714
715
716int devmem_is_allowed(unsigned long pagenr)
717{
718 if (region_intersects(PFN_PHYS(pagenr), PAGE_SIZE,
719 IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE)
720 != REGION_DISJOINT) {
721
722
723
724
725 if (pagenr < 256)
726 return 2;
727
728 return 0;
729 }
730
731
732
733
734
735 if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) {
736
737 if (pagenr < 256)
738 return 1;
739
740 return 0;
741 }
742
743 return 1;
744}
745
746void free_init_pages(char *what, unsigned long begin, unsigned long end)
747{
748 unsigned long begin_aligned, end_aligned;
749
750
751 begin_aligned = PAGE_ALIGN(begin);
752 end_aligned = end & PAGE_MASK;
753
754 if (WARN_ON(begin_aligned != begin || end_aligned != end)) {
755 begin = begin_aligned;
756 end = end_aligned;
757 }
758
759 if (begin >= end)
760 return;
761
762
763
764
765
766
767 if (debug_pagealloc_enabled()) {
768 pr_info("debug: unmapping init [mem %#010lx-%#010lx]\n",
769 begin, end - 1);
770 set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
771 } else {
772
773
774
775
776
777 set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
778 set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
779
780 free_reserved_area((void *)begin, (void *)end,
781 POISON_FREE_INITMEM, what);
782 }
783}
784
785
786
787
788
789
790void free_kernel_image_pages(void *begin, void *end)
791{
792 unsigned long begin_ul = (unsigned long)begin;
793 unsigned long end_ul = (unsigned long)end;
794 unsigned long len_pages = (end_ul - begin_ul) >> PAGE_SHIFT;
795
796
797 free_init_pages("unused kernel image", begin_ul, end_ul);
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814 if (IS_ENABLED(CONFIG_X86_64) && cpu_feature_enabled(X86_FEATURE_PTI))
815 set_memory_np_noalias(begin_ul, len_pages);
816}
817
818void __weak mem_encrypt_free_decrypted_mem(void) { }
819
820void __ref free_initmem(void)
821{
822 e820__reallocate_tables();
823
824 mem_encrypt_free_decrypted_mem();
825
826 free_kernel_image_pages(&__init_begin, &__init_end);
827}
828
829#ifdef CONFIG_BLK_DEV_INITRD
830void __init free_initrd_mem(unsigned long start, unsigned long end)
831{
832
833
834
835
836
837
838
839
840
841 free_init_pages("initrd", start, PAGE_ALIGN(end));
842}
843#endif
844
845
846
847
848
849
850
851
852
853void __init memblock_find_dma_reserve(void)
854{
855#ifdef CONFIG_X86_64
856 u64 nr_pages = 0, nr_free_pages = 0;
857 unsigned long start_pfn, end_pfn;
858 phys_addr_t start_addr, end_addr;
859 int i;
860 u64 u;
861
862
863
864
865
866 nr_pages = 0;
867 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
868 start_pfn = min(start_pfn, MAX_DMA_PFN);
869 end_pfn = min(end_pfn, MAX_DMA_PFN);
870
871 nr_pages += end_pfn - start_pfn;
872 }
873
874
875
876
877
878
879 nr_free_pages = 0;
880 for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start_addr, &end_addr, NULL) {
881 start_pfn = min_t(unsigned long, PFN_UP(start_addr), MAX_DMA_PFN);
882 end_pfn = min_t(unsigned long, PFN_DOWN(end_addr), MAX_DMA_PFN);
883
884 if (start_pfn < end_pfn)
885 nr_free_pages += end_pfn - start_pfn;
886 }
887
888 set_dma_reserve(nr_pages - nr_free_pages);
889#endif
890}
891
892void __init zone_sizes_init(void)
893{
894 unsigned long max_zone_pfns[MAX_NR_ZONES];
895
896 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
897
898#ifdef CONFIG_ZONE_DMA
899 max_zone_pfns[ZONE_DMA] = min(MAX_DMA_PFN, max_low_pfn);
900#endif
901#ifdef CONFIG_ZONE_DMA32
902 max_zone_pfns[ZONE_DMA32] = min(MAX_DMA32_PFN, max_low_pfn);
903#endif
904 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
905#ifdef CONFIG_HIGHMEM
906 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
907#endif
908
909 free_area_init_nodes(max_zone_pfns);
910}
911
912__visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = {
913 .loaded_mm = &init_mm,
914 .next_asid = 1,
915 .cr4 = ~0UL,
916};
917EXPORT_PER_CPU_SYMBOL(cpu_tlbstate);
918
919void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache)
920{
921
922 BUG_ON(!entry && cache != _PAGE_CACHE_MODE_WB);
923
924 __cachemode2pte_tbl[cache] = __cm_idx2pte(entry);
925 __pte2cachemode_tbl[entry] = cache;
926}
927
928#ifdef CONFIG_SWAP
929unsigned long max_swapfile_size(void)
930{
931 unsigned long pages;
932
933 pages = generic_max_swapfile_size();
934
935 if (boot_cpu_has_bug(X86_BUG_L1TF)) {
936
937 unsigned long long l1tf_limit = l1tf_pfn_limit();
938
939
940
941
942#if CONFIG_PGTABLE_LEVELS > 2
943 l1tf_limit <<= PAGE_SHIFT - SWP_OFFSET_FIRST_BIT;
944#endif
945 pages = min_t(unsigned long long, l1tf_limit, pages);
946 }
947 return pages;
948}
949#endif
950