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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
141 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) {
142 for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
143 pmd_idx++) {
144 if ((vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin &&
145 (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end)
146 count++;
147 vaddr += PMD_SIZE;
148 }
149 pmd_idx = 0;
150 }
151#endif
152 return count;
153}
154
155static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
156 unsigned long vaddr, pte_t *lastpte,
157 void **adr)
158{
159#ifdef CONFIG_HIGHMEM
160
161
162
163
164
165
166 int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
167 int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
168
169 if (pmd_idx_kmap_begin != pmd_idx_kmap_end
170 && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin
171 && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) {
172 pte_t *newpte;
173 int i;
174
175 BUG_ON(after_bootmem);
176 newpte = *adr;
177 for (i = 0; i < PTRS_PER_PTE; i++)
178 set_pte(newpte + i, pte[i]);
179 *adr = (void *)(((unsigned long)(*adr)) + PAGE_SIZE);
180
181 paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT);
182 set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE));
183 BUG_ON(newpte != pte_offset_kernel(pmd, 0));
184 __flush_tlb_all();
185
186 paravirt_release_pte(__pa(pte) >> PAGE_SHIFT);
187 pte = newpte;
188 }
189 BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)
190 && vaddr > fix_to_virt(FIX_KMAP_END)
191 && lastpte && lastpte + PTRS_PER_PTE != pte);
192#endif
193 return pte;
194}
195
196
197
198
199
200
201
202
203
204
205static void __init
206page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
207{
208 int pgd_idx, pmd_idx;
209 unsigned long vaddr;
210 pgd_t *pgd;
211 pmd_t *pmd;
212 pte_t *pte = NULL;
213 unsigned long count = page_table_range_init_count(start, end);
214 void *adr = NULL;
215
216 if (count)
217 adr = alloc_low_pages(count);
218
219 vaddr = start;
220 pgd_idx = pgd_index(vaddr);
221 pmd_idx = pmd_index(vaddr);
222 pgd = pgd_base + pgd_idx;
223
224 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
225 pmd = one_md_table_init(pgd);
226 pmd = pmd + pmd_index(vaddr);
227 for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
228 pmd++, pmd_idx++) {
229 pte = page_table_kmap_check(one_page_table_init(pmd),
230 pmd, vaddr, pte, &adr);
231
232 vaddr += PMD_SIZE;
233 }
234 pmd_idx = 0;
235 }
236}
237
238static inline int is_kernel_text(unsigned long addr)
239{
240 if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end)
241 return 1;
242 return 0;
243}
244
245
246
247
248
249
250unsigned long __init
251kernel_physical_mapping_init(unsigned long start,
252 unsigned long end,
253 unsigned long page_size_mask)
254{
255 int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
256 unsigned long last_map_addr = end;
257 unsigned long start_pfn, end_pfn;
258 pgd_t *pgd_base = swapper_pg_dir;
259 int pgd_idx, pmd_idx, pte_ofs;
260 unsigned long pfn;
261 pgd_t *pgd;
262 pmd_t *pmd;
263 pte_t *pte;
264 unsigned pages_2m, pages_4k;
265 int mapping_iter;
266
267 start_pfn = start >> PAGE_SHIFT;
268 end_pfn = end >> PAGE_SHIFT;
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284 mapping_iter = 1;
285
286 if (!cpu_has_pse)
287 use_pse = 0;
288
289repeat:
290 pages_2m = pages_4k = 0;
291 pfn = start_pfn;
292 pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
293 pgd = pgd_base + pgd_idx;
294 for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
295 pmd = one_md_table_init(pgd);
296
297 if (pfn >= end_pfn)
298 continue;
299#ifdef CONFIG_X86_PAE
300 pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
301 pmd += pmd_idx;
302#else
303 pmd_idx = 0;
304#endif
305 for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
306 pmd++, pmd_idx++) {
307 unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
308
309
310
311
312
313 if (use_pse) {
314 unsigned int addr2;
315 pgprot_t prot = PAGE_KERNEL_LARGE;
316
317
318
319
320 pgprot_t init_prot =
321 __pgprot(PTE_IDENT_ATTR |
322 _PAGE_PSE);
323
324 pfn &= PMD_MASK >> PAGE_SHIFT;
325 addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
326 PAGE_OFFSET + PAGE_SIZE-1;
327
328 if (is_kernel_text(addr) ||
329 is_kernel_text(addr2))
330 prot = PAGE_KERNEL_LARGE_EXEC;
331
332 pages_2m++;
333 if (mapping_iter == 1)
334 set_pmd(pmd, pfn_pmd(pfn, init_prot));
335 else
336 set_pmd(pmd, pfn_pmd(pfn, prot));
337
338 pfn += PTRS_PER_PTE;
339 continue;
340 }
341 pte = one_page_table_init(pmd);
342
343 pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
344 pte += pte_ofs;
345 for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
346 pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
347 pgprot_t prot = PAGE_KERNEL;
348
349
350
351
352 pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);
353
354 if (is_kernel_text(addr))
355 prot = PAGE_KERNEL_EXEC;
356
357 pages_4k++;
358 if (mapping_iter == 1) {
359 set_pte(pte, pfn_pte(pfn, init_prot));
360 last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
361 } else
362 set_pte(pte, pfn_pte(pfn, prot));
363 }
364 }
365 }
366 if (mapping_iter == 1) {
367
368
369
370
371 update_page_count(PG_LEVEL_2M, pages_2m);
372 update_page_count(PG_LEVEL_4K, pages_4k);
373
374
375
376
377
378 __flush_tlb_all();
379
380
381
382
383 mapping_iter = 2;
384 goto repeat;
385 }
386 return last_map_addr;
387}
388
389pte_t *kmap_pte;
390pgprot_t kmap_prot;
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 kmap_prot = PAGE_KERNEL;
409}
410
411#ifdef CONFIG_HIGHMEM
412static void __init permanent_kmaps_init(pgd_t *pgd_base)
413{
414 unsigned long vaddr;
415 pgd_t *pgd;
416 pud_t *pud;
417 pmd_t *pmd;
418 pte_t *pte;
419
420 vaddr = PKMAP_BASE;
421 page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
422
423 pgd = swapper_pg_dir + pgd_index(vaddr);
424 pud = pud_offset(pgd, vaddr);
425 pmd = pmd_offset(pud, vaddr);
426 pte = pte_offset_kernel(pmd, vaddr);
427 pkmap_page_table = pte;
428}
429
430void __init add_highpages_with_active_regions(int nid,
431 unsigned long start_pfn, unsigned long end_pfn)
432{
433 phys_addr_t start, end;
434 u64 i;
435
436 for_each_free_mem_range(i, nid, &start, &end, NULL) {
437 unsigned long pfn = clamp_t(unsigned long, PFN_UP(start),
438 start_pfn, end_pfn);
439 unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end),
440 start_pfn, end_pfn);
441 for ( ; pfn < e_pfn; pfn++)
442 if (pfn_valid(pfn))
443 free_highmem_page(pfn_to_page(pfn));
444 }
445}
446#else
447static inline void permanent_kmaps_init(pgd_t *pgd_base)
448{
449}
450#endif
451
452void __init native_pagetable_init(void)
453{
454 unsigned long pfn, va;
455 pgd_t *pgd, *base = swapper_pg_dir;
456 pud_t *pud;
457 pmd_t *pmd;
458 pte_t *pte;
459
460
461
462
463
464
465
466
467
468
469 for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) {
470 va = PAGE_OFFSET + (pfn<<PAGE_SHIFT);
471 pgd = base + pgd_index(va);
472 if (!pgd_present(*pgd))
473 break;
474
475 pud = pud_offset(pgd, va);
476 pmd = pmd_offset(pud, va);
477 if (!pmd_present(*pmd))
478 break;
479
480
481 if (pmd_large(*pmd)) {
482 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",
483 pfn, pmd, __pa(pmd));
484 BUG_ON(1);
485 }
486
487 pte = pte_offset_kernel(pmd, va);
488 if (!pte_present(*pte))
489 break;
490
491 printk(KERN_DEBUG "clearing pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx pte: %p pte phys: %lx\n",
492 pfn, pmd, __pa(pmd), pte, __pa(pte));
493 pte_clear(NULL, va, pte);
494 }
495 paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT);
496 paging_init();
497}
498
499
500
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502
503
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508
509
510
511
512
513
514
515
516
517
518void __init early_ioremap_page_table_range_init(void)
519{
520 pgd_t *pgd_base = swapper_pg_dir;
521 unsigned long vaddr, end;
522
523
524
525
526
527 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
528 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
529 page_table_range_init(vaddr, end, pgd_base);
530 early_ioremap_reset();
531}
532
533static void __init pagetable_init(void)
534{
535 pgd_t *pgd_base = swapper_pg_dir;
536
537 permanent_kmaps_init(pgd_base);
538}
539
540pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
541EXPORT_SYMBOL_GPL(__supported_pte_mask);
542
543
544static unsigned int highmem_pages = -1;
545
546
547
548
549
550
551static int __init parse_highmem(char *arg)
552{
553 if (!arg)
554 return -EINVAL;
555
556 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
557 return 0;
558}
559early_param("highmem", parse_highmem);
560
561#define MSG_HIGHMEM_TOO_BIG \
562 "highmem size (%luMB) is bigger than pages available (%luMB)!\n"
563
564#define MSG_LOWMEM_TOO_SMALL \
565 "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n"
566
567
568
569
570
571static void __init lowmem_pfn_init(void)
572{
573
574 max_low_pfn = max_pfn;
575
576 if (highmem_pages == -1)
577 highmem_pages = 0;
578#ifdef CONFIG_HIGHMEM
579 if (highmem_pages >= max_pfn) {
580 printk(KERN_ERR MSG_HIGHMEM_TOO_BIG,
581 pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
582 highmem_pages = 0;
583 }
584 if (highmem_pages) {
585 if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) {
586 printk(KERN_ERR MSG_LOWMEM_TOO_SMALL,
587 pages_to_mb(highmem_pages));
588 highmem_pages = 0;
589 }
590 max_low_pfn -= highmem_pages;
591 }
592#else
593 if (highmem_pages)
594 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
595#endif
596}
597
598#define MSG_HIGHMEM_TOO_SMALL \
599 "only %luMB highmem pages available, ignoring highmem size of %luMB!\n"
600
601#define MSG_HIGHMEM_TRIMMED \
602 "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n"
603
604
605
606
607static void __init highmem_pfn_init(void)
608{
609 max_low_pfn = MAXMEM_PFN;
610
611 if (highmem_pages == -1)
612 highmem_pages = max_pfn - MAXMEM_PFN;
613
614 if (highmem_pages + MAXMEM_PFN < max_pfn)
615 max_pfn = MAXMEM_PFN + highmem_pages;
616
617 if (highmem_pages + MAXMEM_PFN > max_pfn) {
618 printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL,
619 pages_to_mb(max_pfn - MAXMEM_PFN),
620 pages_to_mb(highmem_pages));
621 highmem_pages = 0;
622 }
623#ifndef CONFIG_HIGHMEM
624
625 printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20);
626 if (max_pfn > MAX_NONPAE_PFN)
627 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
628 else
629 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
630 max_pfn = MAXMEM_PFN;
631#else
632#ifndef CONFIG_HIGHMEM64G
633 if (max_pfn > MAX_NONPAE_PFN) {
634 max_pfn = MAX_NONPAE_PFN;
635 printk(KERN_WARNING MSG_HIGHMEM_TRIMMED);
636 }
637#endif
638#endif
639}
640
641
642
643
644void __init find_low_pfn_range(void)
645{
646
647
648 if (max_pfn <= MAXMEM_PFN)
649 lowmem_pfn_init();
650 else
651 highmem_pfn_init();
652}
653
654#ifndef CONFIG_NEED_MULTIPLE_NODES
655void __init initmem_init(void)
656{
657#ifdef CONFIG_HIGHMEM
658 highstart_pfn = highend_pfn = max_pfn;
659 if (max_pfn > max_low_pfn)
660 highstart_pfn = max_low_pfn;
661 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
662 pages_to_mb(highend_pfn - highstart_pfn));
663 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
664#else
665 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
666#endif
667
668 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
669 sparse_memory_present_with_active_regions(0);
670
671#ifdef CONFIG_FLATMEM
672 max_mapnr = IS_ENABLED(CONFIG_HIGHMEM) ? highend_pfn : max_low_pfn;
673#endif
674 __vmalloc_start_set = true;
675
676 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
677 pages_to_mb(max_low_pfn));
678
679 setup_bootmem_allocator();
680}
681#endif
682
683void __init setup_bootmem_allocator(void)
684{
685 printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
686 max_pfn_mapped<<PAGE_SHIFT);
687 printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
688}
689
690
691
692
693
694
695
696
697void __init paging_init(void)
698{
699 pagetable_init();
700
701 __flush_tlb_all();
702
703 kmap_init();
704
705
706
707
708 olpc_dt_build_devicetree();
709 sparse_memory_present_with_active_regions(MAX_NUMNODES);
710 sparse_init();
711 zone_sizes_init();
712}
713
714
715
716
717
718
719
720static void __init test_wp_bit(void)
721{
722 printk(KERN_INFO
723 "Checking if this processor honours the WP bit even in supervisor mode...");
724
725
726 __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
727 boot_cpu_data.wp_works_ok = do_test_wp_bit();
728 clear_fixmap(FIX_WP_TEST);
729
730 if (!boot_cpu_data.wp_works_ok) {
731 printk(KERN_CONT "No.\n");
732 panic("Linux doesn't support CPUs with broken WP.");
733 } else {
734 printk(KERN_CONT "Ok.\n");
735 }
736}
737
738void __init mem_init(void)
739{
740 pci_iommu_alloc();
741
742#ifdef CONFIG_FLATMEM
743 BUG_ON(!mem_map);
744#endif
745
746
747
748
749
750
751
752
753
754 set_highmem_pages_init();
755
756
757 free_all_bootmem();
758
759 after_bootmem = 1;
760
761 mem_init_print_info(NULL);
762 printk(KERN_INFO "virtual kernel memory layout:\n"
763 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
764#ifdef CONFIG_HIGHMEM
765 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
766#endif
767 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
768 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
769 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
770 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
771 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
772 FIXADDR_START, FIXADDR_TOP,
773 (FIXADDR_TOP - FIXADDR_START) >> 10,
774
775#ifdef CONFIG_HIGHMEM
776 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
777 (LAST_PKMAP*PAGE_SIZE) >> 10,
778#endif
779
780 VMALLOC_START, VMALLOC_END,
781 (VMALLOC_END - VMALLOC_START) >> 20,
782
783 (unsigned long)__va(0), (unsigned long)high_memory,
784 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
785
786 (unsigned long)&__init_begin, (unsigned long)&__init_end,
787 ((unsigned long)&__init_end -
788 (unsigned long)&__init_begin) >> 10,
789
790 (unsigned long)&_etext, (unsigned long)&_edata,
791 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
792
793 (unsigned long)&_text, (unsigned long)&_etext,
794 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
795
796
797
798
799
800#define __FIXADDR_TOP (-PAGE_SIZE)
801#ifdef CONFIG_HIGHMEM
802 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
803 BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE);
804#endif
805#define high_memory (-128UL << 20)
806 BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
807#undef high_memory
808#undef __FIXADDR_TOP
809#ifdef CONFIG_RANDOMIZE_BASE
810 BUILD_BUG_ON(CONFIG_RANDOMIZE_BASE_MAX_OFFSET > KERNEL_IMAGE_SIZE);
811#endif
812
813#ifdef CONFIG_HIGHMEM
814 BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
815 BUG_ON(VMALLOC_END > PKMAP_BASE);
816#endif
817 BUG_ON(VMALLOC_START >= VMALLOC_END);
818 BUG_ON((unsigned long)high_memory > VMALLOC_START);
819
820 if (boot_cpu_data.wp_works_ok < 0)
821 test_wp_bit();
822}
823
824#ifdef CONFIG_MEMORY_HOTPLUG
825int arch_add_memory(int nid, u64 start, u64 size)
826{
827 struct pglist_data *pgdata = NODE_DATA(nid);
828 struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM;
829 unsigned long start_pfn = start >> PAGE_SHIFT;
830 unsigned long nr_pages = size >> PAGE_SHIFT;
831
832 return __add_pages(nid, zone, start_pfn, nr_pages);
833}
834
835#ifdef CONFIG_MEMORY_HOTREMOVE
836int arch_remove_memory(u64 start, u64 size)
837{
838 unsigned long start_pfn = start >> PAGE_SHIFT;
839 unsigned long nr_pages = size >> PAGE_SHIFT;
840 struct zone *zone;
841
842 zone = page_zone(pfn_to_page(start_pfn));
843 return __remove_pages(zone, start_pfn, nr_pages);
844}
845#endif
846#endif
847
848
849
850
851
852static noinline int do_test_wp_bit(void)
853{
854 char tmp_reg;
855 int flag;
856
857 __asm__ __volatile__(
858 " movb %0, %1 \n"
859 "1: movb %1, %0 \n"
860 " xorl %2, %2 \n"
861 "2: \n"
862 _ASM_EXTABLE(1b,2b)
863 :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
864 "=q" (tmp_reg),
865 "=r" (flag)
866 :"2" (1)
867 :"memory");
868
869 return flag;
870}
871
872#ifdef CONFIG_DEBUG_RODATA
873const int rodata_test_data = 0xC3;
874EXPORT_SYMBOL_GPL(rodata_test_data);
875
876int kernel_set_to_readonly __read_mostly;
877
878void set_kernel_text_rw(void)
879{
880 unsigned long start = PFN_ALIGN(_text);
881 unsigned long size = PFN_ALIGN(_etext) - start;
882
883 if (!kernel_set_to_readonly)
884 return;
885
886 pr_debug("Set kernel text: %lx - %lx for read write\n",
887 start, start+size);
888
889 set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
890}
891
892void set_kernel_text_ro(void)
893{
894 unsigned long start = PFN_ALIGN(_text);
895 unsigned long size = PFN_ALIGN(_etext) - start;
896
897 if (!kernel_set_to_readonly)
898 return;
899
900 pr_debug("Set kernel text: %lx - %lx for read only\n",
901 start, start+size);
902
903 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
904}
905
906static void mark_nxdata_nx(void)
907{
908
909
910
911
912 unsigned long start = PFN_ALIGN(_etext);
913
914
915
916 unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;
917
918 if (__supported_pte_mask & _PAGE_NX)
919 printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10);
920 set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT);
921}
922
923void mark_rodata_ro(void)
924{
925 unsigned long start = PFN_ALIGN(_text);
926 unsigned long size = PFN_ALIGN(_etext) - start;
927
928 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
929 printk(KERN_INFO "Write protecting the kernel text: %luk\n",
930 size >> 10);
931
932 kernel_set_to_readonly = 1;
933
934#ifdef CONFIG_CPA_DEBUG
935 printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n",
936 start, start+size);
937 set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT);
938
939 printk(KERN_INFO "Testing CPA: write protecting again\n");
940 set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
941#endif
942
943 start += size;
944 size = (unsigned long)__end_rodata - start;
945 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
946 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
947 size >> 10);
948 rodata_test();
949
950#ifdef CONFIG_CPA_DEBUG
951 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size);
952 set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
953
954 printk(KERN_INFO "Testing CPA: write protecting again\n");
955 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
956#endif
957 mark_nxdata_nx();
958}
959#endif
960
961