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7
8#include <linux/module.h>
9#include <linux/signal.h>
10#include <linux/sched.h>
11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/string.h>
14#include <linux/types.h>
15#include <linux/ptrace.h>
16#include <linux/mman.h>
17#include <linux/mm.h>
18#include <linux/hugetlb.h>
19#include <linux/swap.h>
20#include <linux/smp.h>
21#include <linux/init.h>
22#include <linux/highmem.h>
23#include <linux/pagemap.h>
24#include <linux/pci.h>
25#include <linux/pfn.h>
26#include <linux/poison.h>
27#include <linux/bootmem.h>
28#include <linux/memblock.h>
29#include <linux/proc_fs.h>
30#include <linux/memory_hotplug.h>
31#include <linux/initrd.h>
32#include <linux/cpumask.h>
33#include <linux/gfp.h>
34
35#include <asm/asm.h>
36#include <asm/bios_ebda.h>
37#include <asm/processor.h>
38#include <asm/uaccess.h>
39#include <asm/pgtable.h>
40#include <asm/dma.h>
41#include <asm/fixmap.h>
42#include <asm/e820.h>
43#include <asm/apic.h>
44#include <asm/bugs.h>
45#include <asm/tlb.h>
46#include <asm/tlbflush.h>
47#include <asm/olpc_ofw.h>
48#include <asm/pgalloc.h>
49#include <asm/sections.h>
50#include <asm/paravirt.h>
51#include <asm/setup.h>
52#include <asm/cacheflush.h>
53#include <asm/page_types.h>
54#include <asm/init.h>
55
56#include "mm_internal.h"
57
58unsigned long highstart_pfn, highend_pfn;
59
60static noinline int do_test_wp_bit(void);
61
62bool __read_mostly __vmalloc_start_set = false;
63
64
65
66
67
68
69static pmd_t * __init one_md_table_init(pgd_t *pgd)
70{
71 pud_t *pud;
72 pmd_t *pmd_table;
73
74#ifdef CONFIG_X86_PAE
75 if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
76 pmd_table = (pmd_t *)alloc_low_page();
77 paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
78 set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
79 pud = pud_offset(pgd, 0);
80 BUG_ON(pmd_table != pmd_offset(pud, 0));
81
82 return pmd_table;
83 }
84#endif
85 pud = pud_offset(pgd, 0);
86 pmd_table = pmd_offset(pud, 0);
87
88 return pmd_table;
89}
90
91
92
93
94
95static pte_t * __init one_page_table_init(pmd_t *pmd)
96{
97 if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
98 pte_t *page_table = (pte_t *)alloc_low_page();
99
100 paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
101 set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
102 BUG_ON(page_table != pte_offset_kernel(pmd, 0));
103 }
104
105 return pte_offset_kernel(pmd, 0);
106}
107
108pmd_t * __init populate_extra_pmd(unsigned long vaddr)
109{
110 int pgd_idx = pgd_index(vaddr);
111 int pmd_idx = pmd_index(vaddr);
112
113 return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx;
114}
115
116pte_t * __init populate_extra_pte(unsigned long vaddr)
117{
118 int pte_idx = pte_index(vaddr);
119 pmd_t *pmd;
120
121 pmd = populate_extra_pmd(vaddr);
122 return one_page_table_init(pmd) + pte_idx;
123}
124
125static unsigned long __init
126page_table_range_init_count(unsigned long start, unsigned long end)
127{
128 unsigned long count = 0;
129#ifdef CONFIG_HIGHMEM
130 int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
131 int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
132 int pgd_idx, pmd_idx;
133 unsigned long vaddr;
134
135 if (pmd_idx_kmap_begin == pmd_idx_kmap_end)
136 return 0;
137
138 vaddr = start;
139 pgd_idx = pgd_index(vaddr);
140 pmd_idx = pmd_index(vaddr);
141
142 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) {
143 for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
144 pmd_idx++) {
145 if ((vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin &&
146 (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end)
147 count++;
148 vaddr += PMD_SIZE;
149 }
150 pmd_idx = 0;
151 }
152#endif
153 return count;
154}
155
156static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
157 unsigned long vaddr, pte_t *lastpte,
158 void **adr)
159{
160#ifdef CONFIG_HIGHMEM
161
162
163
164
165
166
167 int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
168 int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
169
170 if (pmd_idx_kmap_begin != pmd_idx_kmap_end
171 && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin
172 && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) {
173 pte_t *newpte;
174 int i;
175
176 BUG_ON(after_bootmem);
177 newpte = *adr;
178 for (i = 0; i < PTRS_PER_PTE; i++)
179 set_pte(newpte + i, pte[i]);
180 *adr = (void *)(((unsigned long)(*adr)) + PAGE_SIZE);
181
182 paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT);
183 set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE));
184 BUG_ON(newpte != pte_offset_kernel(pmd, 0));
185 __flush_tlb_all();
186
187 paravirt_release_pte(__pa(pte) >> PAGE_SHIFT);
188 pte = newpte;
189 }
190 BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)
191 && vaddr > fix_to_virt(FIX_KMAP_END)
192 && lastpte && lastpte + PTRS_PER_PTE != pte);
193#endif
194 return pte;
195}
196
197
198
199
200
201
202
203
204
205
206static void __init
207page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
208{
209 int pgd_idx, pmd_idx;
210 unsigned long vaddr;
211 pgd_t *pgd;
212 pmd_t *pmd;
213 pte_t *pte = NULL;
214 unsigned long count = page_table_range_init_count(start, end);
215 void *adr = NULL;
216
217 if (count)
218 adr = alloc_low_pages(count);
219
220 vaddr = start;
221 pgd_idx = pgd_index(vaddr);
222 pmd_idx = pmd_index(vaddr);
223 pgd = pgd_base + pgd_idx;
224
225 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
226 pmd = one_md_table_init(pgd);
227 pmd = pmd + pmd_index(vaddr);
228 for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
229 pmd++, pmd_idx++) {
230 pte = page_table_kmap_check(one_page_table_init(pmd),
231 pmd, vaddr, pte, &adr);
232
233 vaddr += PMD_SIZE;
234 }
235 pmd_idx = 0;
236 }
237}
238
239static inline int is_kernel_text(unsigned long addr)
240{
241 if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end)
242 return 1;
243 return 0;
244}
245
246
247
248
249
250
251unsigned long __init
252kernel_physical_mapping_init(unsigned long start,
253 unsigned long end,
254 unsigned long page_size_mask)
255{
256 int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
257 unsigned long last_map_addr = end;
258 unsigned long start_pfn, end_pfn;
259 pgd_t *pgd_base = swapper_pg_dir;
260 int pgd_idx, pmd_idx, pte_ofs;
261 unsigned long pfn;
262 pgd_t *pgd;
263 pmd_t *pmd;
264 pte_t *pte;
265 unsigned pages_2m, pages_4k;
266 int mapping_iter;
267
268 start_pfn = start >> PAGE_SHIFT;
269 end_pfn = end >> PAGE_SHIFT;
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285 mapping_iter = 1;
286
287 if (!cpu_has_pse)
288 use_pse = 0;
289
290repeat:
291 pages_2m = pages_4k = 0;
292 pfn = start_pfn;
293 pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
294 pgd = pgd_base + pgd_idx;
295 for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
296 pmd = one_md_table_init(pgd);
297
298 if (pfn >= end_pfn)
299 continue;
300#ifdef CONFIG_X86_PAE
301 pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
302 pmd += pmd_idx;
303#else
304 pmd_idx = 0;
305#endif
306 for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
307 pmd++, pmd_idx++) {
308 unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
309
310
311
312
313
314 if (use_pse) {
315 unsigned int addr2;
316 pgprot_t prot = PAGE_KERNEL_LARGE;
317
318
319
320
321 pgprot_t init_prot =
322 __pgprot(PTE_IDENT_ATTR |
323 _PAGE_PSE);
324
325 pfn &= PMD_MASK >> PAGE_SHIFT;
326 addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
327 PAGE_OFFSET + PAGE_SIZE-1;
328
329 if (is_kernel_text(addr) ||
330 is_kernel_text(addr2))
331 prot = PAGE_KERNEL_LARGE_EXEC;
332
333 pages_2m++;
334 if (mapping_iter == 1)
335 set_pmd(pmd, pfn_pmd(pfn, init_prot));
336 else
337 set_pmd(pmd, pfn_pmd(pfn, prot));
338
339 pfn += PTRS_PER_PTE;
340 continue;
341 }
342 pte = one_page_table_init(pmd);
343
344 pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
345 pte += pte_ofs;
346 for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
347 pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
348 pgprot_t prot = PAGE_KERNEL;
349
350
351
352
353 pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);
354
355 if (is_kernel_text(addr))
356 prot = PAGE_KERNEL_EXEC;
357
358 pages_4k++;
359 if (mapping_iter == 1) {
360 set_pte(pte, pfn_pte(pfn, init_prot));
361 last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
362 } else
363 set_pte(pte, pfn_pte(pfn, prot));
364 }
365 }
366 }
367 if (mapping_iter == 1) {
368
369
370
371
372 update_page_count(PG_LEVEL_2M, pages_2m);
373 update_page_count(PG_LEVEL_4K, pages_4k);
374
375
376
377
378
379 __flush_tlb_all();
380
381
382
383
384 mapping_iter = 2;
385 goto repeat;
386 }
387 return last_map_addr;
388}
389
390pte_t *kmap_pte;
391
392static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
393{
394 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
395 vaddr), vaddr), vaddr);
396}
397
398static void __init kmap_init(void)
399{
400 unsigned long kmap_vstart;
401
402
403
404
405 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
406 kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
407}
408
409#ifdef CONFIG_HIGHMEM
410static void __init permanent_kmaps_init(pgd_t *pgd_base)
411{
412 unsigned long vaddr;
413 pgd_t *pgd;
414 pud_t *pud;
415 pmd_t *pmd;
416 pte_t *pte;
417
418 vaddr = PKMAP_BASE;
419 page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
420
421 pgd = swapper_pg_dir + pgd_index(vaddr);
422 pud = pud_offset(pgd, vaddr);
423 pmd = pmd_offset(pud, vaddr);
424 pte = pte_offset_kernel(pmd, vaddr);
425 pkmap_page_table = pte;
426}
427
428void __init add_highpages_with_active_regions(int nid,
429 unsigned long start_pfn, unsigned long end_pfn)
430{
431 phys_addr_t start, end;
432 u64 i;
433
434 for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &start, &end, NULL) {
435 unsigned long pfn = clamp_t(unsigned long, PFN_UP(start),
436 start_pfn, end_pfn);
437 unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end),
438 start_pfn, end_pfn);
439 for ( ; pfn < e_pfn; pfn++)
440 if (pfn_valid(pfn))
441 free_highmem_page(pfn_to_page(pfn));
442 }
443}
444#else
445static inline void permanent_kmaps_init(pgd_t *pgd_base)
446{
447}
448#endif
449
450void __init native_pagetable_init(void)
451{
452 unsigned long pfn, va;
453 pgd_t *pgd, *base = swapper_pg_dir;
454 pud_t *pud;
455 pmd_t *pmd;
456 pte_t *pte;
457
458
459
460
461
462
463
464
465
466
467 for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) {
468 va = PAGE_OFFSET + (pfn<<PAGE_SHIFT);
469 pgd = base + pgd_index(va);
470 if (!pgd_present(*pgd))
471 break;
472
473 pud = pud_offset(pgd, va);
474 pmd = pmd_offset(pud, va);
475 if (!pmd_present(*pmd))
476 break;
477
478
479 if (pmd_large(*pmd)) {
480 pr_warn("try to clear pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx, but pmd is big page and is not using pte !\n",
481 pfn, pmd, __pa(pmd));
482 BUG_ON(1);
483 }
484
485 pte = pte_offset_kernel(pmd, va);
486 if (!pte_present(*pte))
487 break;
488
489 printk(KERN_DEBUG "clearing pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx pte: %p pte phys: %lx\n",
490 pfn, pmd, __pa(pmd), pte, __pa(pte));
491 pte_clear(NULL, va, pte);
492 }
493 paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT);
494 paging_init();
495}
496
497
498
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508
509
510
511
512
513
514
515
516void __init early_ioremap_page_table_range_init(void)
517{
518 pgd_t *pgd_base = swapper_pg_dir;
519 unsigned long vaddr, end;
520
521
522
523
524
525 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
526 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
527 page_table_range_init(vaddr, end, pgd_base);
528 early_ioremap_reset();
529}
530
531static void __init pagetable_init(void)
532{
533 pgd_t *pgd_base = swapper_pg_dir;
534
535 permanent_kmaps_init(pgd_base);
536}
537
538pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL);
539EXPORT_SYMBOL_GPL(__supported_pte_mask);
540
541
542static unsigned int highmem_pages = -1;
543
544
545
546
547
548
549static int __init parse_highmem(char *arg)
550{
551 if (!arg)
552 return -EINVAL;
553
554 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
555 return 0;
556}
557early_param("highmem", parse_highmem);
558
559#define MSG_HIGHMEM_TOO_BIG \
560 "highmem size (%luMB) is bigger than pages available (%luMB)!\n"
561
562#define MSG_LOWMEM_TOO_SMALL \
563 "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n"
564
565
566
567
568
569static void __init lowmem_pfn_init(void)
570{
571
572 max_low_pfn = max_pfn;
573
574 if (highmem_pages == -1)
575 highmem_pages = 0;
576#ifdef CONFIG_HIGHMEM
577 if (highmem_pages >= max_pfn) {
578 printk(KERN_ERR MSG_HIGHMEM_TOO_BIG,
579 pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
580 highmem_pages = 0;
581 }
582 if (highmem_pages) {
583 if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) {
584 printk(KERN_ERR MSG_LOWMEM_TOO_SMALL,
585 pages_to_mb(highmem_pages));
586 highmem_pages = 0;
587 }
588 max_low_pfn -= highmem_pages;
589 }
590#else
591 if (highmem_pages)
592 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
593#endif
594}
595
596#define MSG_HIGHMEM_TOO_SMALL \
597 "only %luMB highmem pages available, ignoring highmem size of %luMB!\n"
598
599#define MSG_HIGHMEM_TRIMMED \
600 "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n"
601
602
603
604
605static void __init highmem_pfn_init(void)
606{
607 max_low_pfn = MAXMEM_PFN;
608
609 if (highmem_pages == -1)
610 highmem_pages = max_pfn - MAXMEM_PFN;
611
612 if (highmem_pages + MAXMEM_PFN < max_pfn)
613 max_pfn = MAXMEM_PFN + highmem_pages;
614
615 if (highmem_pages + MAXMEM_PFN > max_pfn) {
616 printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL,
617 pages_to_mb(max_pfn - MAXMEM_PFN),
618 pages_to_mb(highmem_pages));
619 highmem_pages = 0;
620 }
621#ifndef CONFIG_HIGHMEM
622
623 printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20);
624 if (max_pfn > MAX_NONPAE_PFN)
625 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
626 else
627 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
628 max_pfn = MAXMEM_PFN;
629#else
630#ifndef CONFIG_HIGHMEM64G
631 if (max_pfn > MAX_NONPAE_PFN) {
632 max_pfn = MAX_NONPAE_PFN;
633 printk(KERN_WARNING MSG_HIGHMEM_TRIMMED);
634 }
635#endif
636#endif
637}
638
639
640
641
642void __init find_low_pfn_range(void)
643{
644
645
646 if (max_pfn <= MAXMEM_PFN)
647 lowmem_pfn_init();
648 else
649 highmem_pfn_init();
650}
651
652#ifndef CONFIG_NEED_MULTIPLE_NODES
653void __init initmem_init(void)
654{
655#ifdef CONFIG_HIGHMEM
656 highstart_pfn = highend_pfn = max_pfn;
657 if (max_pfn > max_low_pfn)
658 highstart_pfn = max_low_pfn;
659 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
660 pages_to_mb(highend_pfn - highstart_pfn));
661 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
662#else
663 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
664#endif
665
666 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
667 sparse_memory_present_with_active_regions(0);
668
669#ifdef CONFIG_FLATMEM
670 max_mapnr = IS_ENABLED(CONFIG_HIGHMEM) ? highend_pfn : max_low_pfn;
671#endif
672 __vmalloc_start_set = true;
673
674 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
675 pages_to_mb(max_low_pfn));
676
677 setup_bootmem_allocator();
678}
679#endif
680
681void __init setup_bootmem_allocator(void)
682{
683 printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
684 max_pfn_mapped<<PAGE_SHIFT);
685 printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
686}
687
688
689
690
691
692
693
694
695void __init paging_init(void)
696{
697 pagetable_init();
698
699 __flush_tlb_all();
700
701 kmap_init();
702
703
704
705
706 olpc_dt_build_devicetree();
707 sparse_memory_present_with_active_regions(MAX_NUMNODES);
708 sparse_init();
709 zone_sizes_init();
710}
711
712
713
714
715
716
717
718static void __init test_wp_bit(void)
719{
720 printk(KERN_INFO
721 "Checking if this processor honours the WP bit even in supervisor mode...");
722
723
724 __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
725 boot_cpu_data.wp_works_ok = do_test_wp_bit();
726 clear_fixmap(FIX_WP_TEST);
727
728 if (!boot_cpu_data.wp_works_ok) {
729 printk(KERN_CONT "No.\n");
730 panic("Linux doesn't support CPUs with broken WP.");
731 } else {
732 printk(KERN_CONT "Ok.\n");
733 }
734}
735
736void __init mem_init(void)
737{
738 pci_iommu_alloc();
739
740#ifdef CONFIG_FLATMEM
741 BUG_ON(!mem_map);
742#endif
743
744
745
746
747
748
749
750
751
752 set_highmem_pages_init();
753
754
755 free_all_bootmem();
756
757 after_bootmem = 1;
758
759 mem_init_print_info(NULL);
760 printk(KERN_INFO "virtual kernel memory layout:\n"
761 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
762#ifdef CONFIG_HIGHMEM
763 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
764#endif
765 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
766 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
767 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
768 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
769 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
770 FIXADDR_START, FIXADDR_TOP,
771 (FIXADDR_TOP - FIXADDR_START) >> 10,
772
773#ifdef CONFIG_HIGHMEM
774 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
775 (LAST_PKMAP*PAGE_SIZE) >> 10,
776#endif
777
778 VMALLOC_START, VMALLOC_END,
779 (VMALLOC_END - VMALLOC_START) >> 20,
780
781 (unsigned long)__va(0), (unsigned long)high_memory,
782 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
783
784 (unsigned long)&__init_begin, (unsigned long)&__init_end,
785 ((unsigned long)&__init_end -
786 (unsigned long)&__init_begin) >> 10,
787
788 (unsigned long)&_etext, (unsigned long)&_edata,
789 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
790
791 (unsigned long)&_text, (unsigned long)&_etext,
792 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
793
794
795
796
797
798#define __FIXADDR_TOP (-PAGE_SIZE)
799#ifdef CONFIG_HIGHMEM
800 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
801 BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE);
802#endif
803#define high_memory (-128UL << 20)
804 BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
805#undef high_memory
806#undef __FIXADDR_TOP
807#ifdef CONFIG_RANDOMIZE_BASE
808 BUILD_BUG_ON(CONFIG_RANDOMIZE_BASE_MAX_OFFSET > KERNEL_IMAGE_SIZE);
809#endif
810
811#ifdef CONFIG_HIGHMEM
812 BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
813 BUG_ON(VMALLOC_END > PKMAP_BASE);
814#endif
815 BUG_ON(VMALLOC_START >= VMALLOC_END);
816 BUG_ON((unsigned long)high_memory > VMALLOC_START);
817
818 if (boot_cpu_data.wp_works_ok < 0)
819 test_wp_bit();
820}
821
822#ifdef CONFIG_MEMORY_HOTPLUG
823int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
824{
825 struct pglist_data *pgdata = NODE_DATA(nid);
826 struct zone *zone = pgdata->node_zones +
827 zone_for_memory(nid, start, size, ZONE_HIGHMEM, for_device);
828 unsigned long start_pfn = start >> PAGE_SHIFT;
829 unsigned long nr_pages = size >> PAGE_SHIFT;
830
831 return __add_pages(nid, zone, start_pfn, nr_pages);
832}
833
834#ifdef CONFIG_MEMORY_HOTREMOVE
835int arch_remove_memory(u64 start, u64 size)
836{
837 unsigned long start_pfn = start >> PAGE_SHIFT;
838 unsigned long nr_pages = size >> PAGE_SHIFT;
839 struct zone *zone;
840
841 zone = page_zone(pfn_to_page(start_pfn));
842 return __remove_pages(zone, start_pfn, nr_pages);
843}
844#endif
845#endif
846
847
848
849
850
851static noinline int do_test_wp_bit(void)
852{
853 char tmp_reg;
854 int flag;
855
856 __asm__ __volatile__(
857 " movb %0, %1 \n"
858 "1: movb %1, %0 \n"
859 " xorl %2, %2 \n"
860 "2: \n"
861 _ASM_EXTABLE(1b,2b)
862 :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
863 "=q" (tmp_reg),
864 "=r" (flag)
865 :"2" (1)
866 :"memory");
867
868 return flag;
869}
870
871const int rodata_test_data = 0xC3;
872EXPORT_SYMBOL_GPL(rodata_test_data);
873
874int kernel_set_to_readonly __read_mostly;
875
876void set_kernel_text_rw(void)
877{
878 unsigned long start = PFN_ALIGN(_text);
879 unsigned long size = PFN_ALIGN(_etext) - start;
880
881 if (!kernel_set_to_readonly)
882 return;
883
884 pr_debug("Set kernel text: %lx - %lx for read write\n",
885 start, start+size);
886
887 set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
888}
889
890void set_kernel_text_ro(void)
891{
892 unsigned long start = PFN_ALIGN(_text);
893 unsigned long size = PFN_ALIGN(_etext) - start;
894
895 if (!kernel_set_to_readonly)
896 return;
897
898 pr_debug("Set kernel text: %lx - %lx for read only\n",
899 start, start+size);
900
901 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
902}
903
904static void mark_nxdata_nx(void)
905{
906
907
908
909
910 unsigned long start = PFN_ALIGN(_etext);
911
912
913
914 unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;
915
916 if (__supported_pte_mask & _PAGE_NX)
917 printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10);
918 set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT);
919}
920
921void mark_rodata_ro(void)
922{
923 unsigned long start = PFN_ALIGN(_text);
924 unsigned long size = PFN_ALIGN(_etext) - start;
925
926 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
927 printk(KERN_INFO "Write protecting the kernel text: %luk\n",
928 size >> 10);
929
930 kernel_set_to_readonly = 1;
931
932#ifdef CONFIG_CPA_DEBUG
933 printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n",
934 start, start+size);
935 set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT);
936
937 printk(KERN_INFO "Testing CPA: write protecting again\n");
938 set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
939#endif
940
941 start += size;
942 size = (unsigned long)__end_rodata - start;
943 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
944 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
945 size >> 10);
946 rodata_test();
947
948#ifdef CONFIG_CPA_DEBUG
949 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size);
950 set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
951
952 printk(KERN_INFO "Testing CPA: write protecting again\n");
953 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
954#endif
955 mark_nxdata_nx();
956 if (__supported_pte_mask & _PAGE_NX)
957 debug_checkwx();
958}
959