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
8#include <asm/cacheflush.h>
9#include <asm/e820.h>
10#include <asm/init.h>
11#include <asm/page.h>
12#include <asm/page_types.h>
13#include <asm/sections.h>
14#include <asm/setup.h>
15#include <asm/tlbflush.h>
16#include <asm/tlb.h>
17#include <asm/proto.h>
18#include <asm/dma.h>
19#include <asm/microcode.h>
20
21
22
23
24
25#define CREATE_TRACE_POINTS
26#include <trace/events/tlb.h>
27
28#include "mm_internal.h"
29
30
31
32
33
34
35
36
37
38uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM] = {
39 [_PAGE_CACHE_MODE_WB] = 0,
40 [_PAGE_CACHE_MODE_WC] = _PAGE_PWT,
41 [_PAGE_CACHE_MODE_UC_MINUS] = _PAGE_PCD,
42 [_PAGE_CACHE_MODE_UC] = _PAGE_PCD | _PAGE_PWT,
43 [_PAGE_CACHE_MODE_WT] = _PAGE_PCD,
44 [_PAGE_CACHE_MODE_WP] = _PAGE_PCD,
45};
46EXPORT_SYMBOL(__cachemode2pte_tbl);
47uint8_t __pte2cachemode_tbl[8] = {
48 [__pte2cm_idx(0)] = _PAGE_CACHE_MODE_WB,
49 [__pte2cm_idx(_PAGE_PWT)] = _PAGE_CACHE_MODE_WC,
50 [__pte2cm_idx(_PAGE_PCD)] = _PAGE_CACHE_MODE_UC_MINUS,
51 [__pte2cm_idx(_PAGE_PWT | _PAGE_PCD)] = _PAGE_CACHE_MODE_UC,
52 [__pte2cm_idx(_PAGE_PAT)] = _PAGE_CACHE_MODE_WB,
53 [__pte2cm_idx(_PAGE_PWT | _PAGE_PAT)] = _PAGE_CACHE_MODE_WC,
54 [__pte2cm_idx(_PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC_MINUS,
55 [__pte2cm_idx(_PAGE_PWT | _PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC,
56};
57EXPORT_SYMBOL(__pte2cachemode_tbl);
58
59static unsigned long __initdata pgt_buf_start;
60static unsigned long __initdata pgt_buf_end;
61static unsigned long __initdata pgt_buf_top;
62
63static unsigned long min_pfn_mapped;
64
65static bool __initdata can_use_brk_pgt = true;
66
67
68
69
70
71
72
73
74
75
76__ref void *alloc_low_pages(unsigned int num)
77{
78 unsigned long pfn;
79 int i;
80
81 if (after_bootmem) {
82 unsigned int order;
83
84 order = get_order((unsigned long)num << PAGE_SHIFT);
85 return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK |
86 __GFP_ZERO, order);
87 }
88
89 if ((pgt_buf_end + num) > pgt_buf_top || !can_use_brk_pgt) {
90 unsigned long ret;
91 if (min_pfn_mapped >= max_pfn_mapped)
92 panic("alloc_low_pages: ran out of memory");
93 ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT,
94 max_pfn_mapped << PAGE_SHIFT,
95 PAGE_SIZE * num , PAGE_SIZE);
96 if (!ret)
97 panic("alloc_low_pages: can not alloc memory");
98 memblock_reserve(ret, PAGE_SIZE * num);
99 pfn = ret >> PAGE_SHIFT;
100 } else {
101 pfn = pgt_buf_end;
102 pgt_buf_end += num;
103 printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n",
104 pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1);
105 }
106
107 for (i = 0; i < num; i++) {
108 void *adr;
109
110 adr = __va((pfn + i) << PAGE_SHIFT);
111 clear_page(adr);
112 }
113
114 return __va(pfn << PAGE_SHIFT);
115}
116
117
118#define INIT_PGT_BUF_SIZE (6 * PAGE_SIZE)
119RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE);
120void __init early_alloc_pgt_buf(void)
121{
122 unsigned long tables = INIT_PGT_BUF_SIZE;
123 phys_addr_t base;
124
125 base = __pa(extend_brk(tables, PAGE_SIZE));
126
127 pgt_buf_start = base >> PAGE_SHIFT;
128 pgt_buf_end = pgt_buf_start;
129 pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);
130}
131
132int after_bootmem;
133
134int direct_gbpages
135#ifdef CONFIG_DIRECT_GBPAGES
136 = 1
137#endif
138;
139
140static void __init init_gbpages(void)
141{
142#ifdef CONFIG_X86_64
143 if (direct_gbpages && cpu_has_gbpages)
144 printk(KERN_INFO "Using GB pages for direct mapping\n");
145 else
146 direct_gbpages = 0;
147#endif
148}
149
150struct map_range {
151 unsigned long start;
152 unsigned long end;
153 unsigned page_size_mask;
154};
155
156static int page_size_mask;
157
158static void __init probe_page_size_mask(void)
159{
160 init_gbpages();
161
162#if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK)
163
164
165
166
167
168 if (direct_gbpages)
169 page_size_mask |= 1 << PG_LEVEL_1G;
170 if (cpu_has_pse)
171 page_size_mask |= 1 << PG_LEVEL_2M;
172#endif
173
174
175 if (cpu_has_pse)
176 cr4_set_bits_and_update_boot(X86_CR4_PSE);
177
178
179 if (cpu_has_pge) {
180 cr4_set_bits_and_update_boot(X86_CR4_PGE);
181 __supported_pte_mask |= _PAGE_GLOBAL;
182 }
183}
184
185#ifdef CONFIG_X86_32
186#define NR_RANGE_MR 3
187#else
188#define NR_RANGE_MR 5
189#endif
190
191static int __meminit save_mr(struct map_range *mr, int nr_range,
192 unsigned long start_pfn, unsigned long end_pfn,
193 unsigned long page_size_mask)
194{
195 if (start_pfn < end_pfn) {
196 if (nr_range >= NR_RANGE_MR)
197 panic("run out of range for init_memory_mapping\n");
198 mr[nr_range].start = start_pfn<<PAGE_SHIFT;
199 mr[nr_range].end = end_pfn<<PAGE_SHIFT;
200 mr[nr_range].page_size_mask = page_size_mask;
201 nr_range++;
202 }
203
204 return nr_range;
205}
206
207
208
209
210
211static void __init_refok adjust_range_page_size_mask(struct map_range *mr,
212 int nr_range)
213{
214 int i;
215
216 for (i = 0; i < nr_range; i++) {
217 if ((page_size_mask & (1<<PG_LEVEL_2M)) &&
218 !(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) {
219 unsigned long start = round_down(mr[i].start, PMD_SIZE);
220 unsigned long end = round_up(mr[i].end, PMD_SIZE);
221
222#ifdef CONFIG_X86_32
223 if ((end >> PAGE_SHIFT) > max_low_pfn)
224 continue;
225#endif
226
227 if (memblock_is_region_memory(start, end - start))
228 mr[i].page_size_mask |= 1<<PG_LEVEL_2M;
229 }
230 if ((page_size_mask & (1<<PG_LEVEL_1G)) &&
231 !(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) {
232 unsigned long start = round_down(mr[i].start, PUD_SIZE);
233 unsigned long end = round_up(mr[i].end, PUD_SIZE);
234
235 if (memblock_is_region_memory(start, end - start))
236 mr[i].page_size_mask |= 1<<PG_LEVEL_1G;
237 }
238 }
239}
240
241static const char *page_size_string(struct map_range *mr)
242{
243 static const char str_1g[] = "1G";
244 static const char str_2m[] = "2M";
245 static const char str_4m[] = "4M";
246 static const char str_4k[] = "4k";
247
248 if (mr->page_size_mask & (1<<PG_LEVEL_1G))
249 return str_1g;
250
251
252
253
254
255 if (IS_ENABLED(CONFIG_X86_32) &&
256 !IS_ENABLED(CONFIG_X86_PAE) &&
257 mr->page_size_mask & (1<<PG_LEVEL_2M))
258 return str_4m;
259
260 if (mr->page_size_mask & (1<<PG_LEVEL_2M))
261 return str_2m;
262
263 return str_4k;
264}
265
266static int __meminit split_mem_range(struct map_range *mr, int nr_range,
267 unsigned long start,
268 unsigned long end)
269{
270 unsigned long start_pfn, end_pfn, limit_pfn;
271 unsigned long pfn;
272 int i;
273
274 limit_pfn = PFN_DOWN(end);
275
276
277 pfn = start_pfn = PFN_DOWN(start);
278#ifdef CONFIG_X86_32
279
280
281
282
283
284
285 if (pfn == 0)
286 end_pfn = PFN_DOWN(PMD_SIZE);
287 else
288 end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
289#else
290 end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
291#endif
292 if (end_pfn > limit_pfn)
293 end_pfn = limit_pfn;
294 if (start_pfn < end_pfn) {
295 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
296 pfn = end_pfn;
297 }
298
299
300 start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
301#ifdef CONFIG_X86_32
302 end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
303#else
304 end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
305 if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE)))
306 end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
307#endif
308
309 if (start_pfn < end_pfn) {
310 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
311 page_size_mask & (1<<PG_LEVEL_2M));
312 pfn = end_pfn;
313 }
314
315#ifdef CONFIG_X86_64
316
317 start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
318 end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE));
319 if (start_pfn < end_pfn) {
320 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
321 page_size_mask &
322 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
323 pfn = end_pfn;
324 }
325
326
327 start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
328 end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
329 if (start_pfn < end_pfn) {
330 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
331 page_size_mask & (1<<PG_LEVEL_2M));
332 pfn = end_pfn;
333 }
334#endif
335
336
337 start_pfn = pfn;
338 end_pfn = limit_pfn;
339 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
340
341 if (!after_bootmem)
342 adjust_range_page_size_mask(mr, nr_range);
343
344
345 for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
346 unsigned long old_start;
347 if (mr[i].end != mr[i+1].start ||
348 mr[i].page_size_mask != mr[i+1].page_size_mask)
349 continue;
350
351 old_start = mr[i].start;
352 memmove(&mr[i], &mr[i+1],
353 (nr_range - 1 - i) * sizeof(struct map_range));
354 mr[i--].start = old_start;
355 nr_range--;
356 }
357
358 for (i = 0; i < nr_range; i++)
359 printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n",
360 mr[i].start, mr[i].end - 1,
361 page_size_string(&mr[i]));
362
363 return nr_range;
364}
365
366struct range pfn_mapped[E820_X_MAX];
367int nr_pfn_mapped;
368
369static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn)
370{
371 nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX,
372 nr_pfn_mapped, start_pfn, end_pfn);
373 nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX);
374
375 max_pfn_mapped = max(max_pfn_mapped, end_pfn);
376
377 if (start_pfn < (1UL<<(32-PAGE_SHIFT)))
378 max_low_pfn_mapped = max(max_low_pfn_mapped,
379 min(end_pfn, 1UL<<(32-PAGE_SHIFT)));
380}
381
382bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn)
383{
384 int i;
385
386 for (i = 0; i < nr_pfn_mapped; i++)
387 if ((start_pfn >= pfn_mapped[i].start) &&
388 (end_pfn <= pfn_mapped[i].end))
389 return true;
390
391 return false;
392}
393
394
395
396
397
398
399unsigned long __init_refok init_memory_mapping(unsigned long start,
400 unsigned long end)
401{
402 struct map_range mr[NR_RANGE_MR];
403 unsigned long ret = 0;
404 int nr_range, i;
405
406 pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n",
407 start, end - 1);
408
409 memset(mr, 0, sizeof(mr));
410 nr_range = split_mem_range(mr, 0, start, end);
411
412 for (i = 0; i < nr_range; i++)
413 ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
414 mr[i].page_size_mask);
415
416 add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT);
417
418 return ret >> PAGE_SHIFT;
419}
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434static unsigned long __init init_range_memory_mapping(
435 unsigned long r_start,
436 unsigned long r_end)
437{
438 unsigned long start_pfn, end_pfn;
439 unsigned long mapped_ram_size = 0;
440 int i;
441
442 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
443 u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end);
444 u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end);
445 if (start >= end)
446 continue;
447
448
449
450
451
452 can_use_brk_pgt = max(start, (u64)pgt_buf_end<<PAGE_SHIFT) >=
453 min(end, (u64)pgt_buf_top<<PAGE_SHIFT);
454 init_memory_mapping(start, end);
455 mapped_ram_size += end - start;
456 can_use_brk_pgt = true;
457 }
458
459 return mapped_ram_size;
460}
461
462static unsigned long __init get_new_step_size(unsigned long step_size)
463{
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478 return step_size << (PMD_SHIFT - PAGE_SHIFT - 1);
479}
480
481
482
483
484
485
486
487
488
489
490
491static void __init memory_map_top_down(unsigned long map_start,
492 unsigned long map_end)
493{
494 unsigned long real_end, start, last_start;
495 unsigned long step_size;
496 unsigned long addr;
497 unsigned long mapped_ram_size = 0;
498
499
500 addr = memblock_find_in_range(map_start, map_end, PMD_SIZE, PMD_SIZE);
501 real_end = addr + PMD_SIZE;
502
503
504 step_size = PMD_SIZE;
505 max_pfn_mapped = 0;
506 min_pfn_mapped = real_end >> PAGE_SHIFT;
507 last_start = start = real_end;
508
509
510
511
512
513
514
515 while (last_start > map_start) {
516 if (last_start > step_size) {
517 start = round_down(last_start - 1, step_size);
518 if (start < map_start)
519 start = map_start;
520 } else
521 start = map_start;
522 mapped_ram_size += init_range_memory_mapping(start,
523 last_start);
524 last_start = start;
525 min_pfn_mapped = last_start >> PAGE_SHIFT;
526 if (mapped_ram_size >= step_size)
527 step_size = get_new_step_size(step_size);
528 }
529
530 if (real_end < map_end)
531 init_range_memory_mapping(real_end, map_end);
532}
533
534
535
536
537
538
539
540
541
542
543
544
545static void __init memory_map_bottom_up(unsigned long map_start,
546 unsigned long map_end)
547{
548 unsigned long next, start;
549 unsigned long mapped_ram_size = 0;
550
551 unsigned long step_size = PMD_SIZE;
552
553 start = map_start;
554 min_pfn_mapped = start >> PAGE_SHIFT;
555
556
557
558
559
560
561
562 while (start < map_end) {
563 if (step_size && map_end - start > step_size) {
564 next = round_up(start + 1, step_size);
565 if (next > map_end)
566 next = map_end;
567 } else {
568 next = map_end;
569 }
570
571 mapped_ram_size += init_range_memory_mapping(start, next);
572 start = next;
573
574 if (mapped_ram_size >= step_size)
575 step_size = get_new_step_size(step_size);
576 }
577}
578
579void __init init_mem_mapping(void)
580{
581 unsigned long end;
582
583 probe_page_size_mask();
584
585#ifdef CONFIG_X86_64
586 end = max_pfn << PAGE_SHIFT;
587#else
588 end = max_low_pfn << PAGE_SHIFT;
589#endif
590
591
592 init_memory_mapping(0, ISA_END_ADDRESS);
593
594
595
596
597
598 if (memblock_bottom_up()) {
599 unsigned long kernel_end = __pa_symbol(_end);
600
601
602
603
604
605
606
607
608 memory_map_bottom_up(kernel_end, end);
609 memory_map_bottom_up(ISA_END_ADDRESS, kernel_end);
610 } else {
611 memory_map_top_down(ISA_END_ADDRESS, end);
612 }
613
614#ifdef CONFIG_X86_64
615 if (max_pfn > max_low_pfn) {
616
617 max_low_pfn = max_pfn;
618 }
619#else
620 early_ioremap_page_table_range_init();
621#endif
622
623 load_cr3(swapper_pg_dir);
624 __flush_tlb_all();
625
626 early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
627}
628
629
630
631
632
633
634
635
636
637
638
639int devmem_is_allowed(unsigned long pagenr)
640{
641 if (pagenr < 256)
642 return 1;
643 if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
644 return 0;
645 if (!page_is_ram(pagenr))
646 return 1;
647 return 0;
648}
649
650void free_init_pages(char *what, unsigned long begin, unsigned long end)
651{
652 unsigned long begin_aligned, end_aligned;
653
654
655 begin_aligned = PAGE_ALIGN(begin);
656 end_aligned = end & PAGE_MASK;
657
658 if (WARN_ON(begin_aligned != begin || end_aligned != end)) {
659 begin = begin_aligned;
660 end = end_aligned;
661 }
662
663 if (begin >= end)
664 return;
665
666
667
668
669
670
671#ifdef CONFIG_DEBUG_PAGEALLOC
672 printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n",
673 begin, end - 1);
674 set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
675#else
676
677
678
679
680
681 set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
682 set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
683
684 free_reserved_area((void *)begin, (void *)end, POISON_FREE_INITMEM, what);
685#endif
686}
687
688void free_initmem(void)
689{
690 free_init_pages("unused kernel",
691 (unsigned long)(&__init_begin),
692 (unsigned long)(&__init_end));
693}
694
695#ifdef CONFIG_BLK_DEV_INITRD
696void __init free_initrd_mem(unsigned long start, unsigned long end)
697{
698#ifdef CONFIG_MICROCODE_EARLY
699
700
701
702
703
704 save_microcode_in_initrd();
705#endif
706
707
708
709
710
711
712
713
714
715
716 free_init_pages("initrd", start, PAGE_ALIGN(end));
717}
718#endif
719
720void __init zone_sizes_init(void)
721{
722 unsigned long max_zone_pfns[MAX_NR_ZONES];
723
724 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
725
726#ifdef CONFIG_ZONE_DMA
727 max_zone_pfns[ZONE_DMA] = min(MAX_DMA_PFN, max_low_pfn);
728#endif
729#ifdef CONFIG_ZONE_DMA32
730 max_zone_pfns[ZONE_DMA32] = min(MAX_DMA32_PFN, max_low_pfn);
731#endif
732 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
733#ifdef CONFIG_HIGHMEM
734 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
735#endif
736
737 free_area_init_nodes(max_zone_pfns);
738}
739
740DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = {
741#ifdef CONFIG_SMP
742 .active_mm = &init_mm,
743 .state = 0,
744#endif
745 .cr4 = ~0UL,
746};
747EXPORT_SYMBOL_GPL(cpu_tlbstate);
748
749void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache)
750{
751
752 BUG_ON(!entry && cache != _PAGE_CACHE_MODE_WB);
753
754 __cachemode2pte_tbl[cache] = __cm_idx2pte(entry);
755 __pte2cachemode_tbl[entry] = cache;
756}
757