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7
8
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/memblock.h>
28#include <linux/proc_fs.h>
29#include <linux/memory_hotplug.h>
30#include <linux/initrd.h>
31#include <linux/cpumask.h>
32#include <linux/gfp.h>
33
34#include <asm/asm.h>
35#include <asm/bios_ebda.h>
36#include <asm/processor.h>
37#include <linux/uaccess.h>
38#include <asm/dma.h>
39#include <asm/fixmap.h>
40#include <asm/e820/api.h>
41#include <asm/apic.h>
42#include <asm/bugs.h>
43#include <asm/tlb.h>
44#include <asm/tlbflush.h>
45#include <asm/olpc_ofw.h>
46#include <asm/pgalloc.h>
47#include <asm/sections.h>
48#include <asm/paravirt.h>
49#include <asm/setup.h>
50#include <asm/set_memory.h>
51#include <asm/page_types.h>
52#include <asm/cpu_entry_area.h>
53#include <asm/init.h>
54#include <asm/pgtable_areas.h>
55#include <asm/numa.h>
56
57#include "mm_internal.h"
58
59unsigned long highstart_pfn, highend_pfn;
60
61bool __read_mostly __vmalloc_start_set = false;
62
63
64
65
66
67
68static pmd_t * __init one_md_table_init(pgd_t *pgd)
69{
70 p4d_t *p4d;
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 p4d = p4d_offset(pgd, 0);
80 pud = pud_offset(p4d, 0);
81 BUG_ON(pmd_table != pmd_offset(pud, 0));
82
83 return pmd_table;
84 }
85#endif
86 p4d = p4d_offset(pgd, 0);
87 pud = pud_offset(p4d, 0);
88 pmd_table = pmd_offset(pud, 0);
89
90 return pmd_table;
91}
92
93
94
95
96
97static pte_t * __init one_page_table_init(pmd_t *pmd)
98{
99 if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
100 pte_t *page_table = (pte_t *)alloc_low_page();
101
102 paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
103 set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
104 BUG_ON(page_table != pte_offset_kernel(pmd, 0));
105 }
106
107 return pte_offset_kernel(pmd, 0);
108}
109
110pmd_t * __init populate_extra_pmd(unsigned long vaddr)
111{
112 int pgd_idx = pgd_index(vaddr);
113 int pmd_idx = pmd_index(vaddr);
114
115 return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx;
116}
117
118pte_t * __init populate_extra_pte(unsigned long vaddr)
119{
120 int pte_idx = pte_index(vaddr);
121 pmd_t *pmd;
122
123 pmd = populate_extra_pmd(vaddr);
124 return one_page_table_init(pmd) + pte_idx;
125}
126
127static unsigned long __init
128page_table_range_init_count(unsigned long start, unsigned long end)
129{
130 unsigned long count = 0;
131#ifdef CONFIG_HIGHMEM
132 int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
133 int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
134 int pgd_idx, pmd_idx;
135 unsigned long vaddr;
136
137 if (pmd_idx_kmap_begin == pmd_idx_kmap_end)
138 return 0;
139
140 vaddr = start;
141 pgd_idx = pgd_index(vaddr);
142 pmd_idx = pmd_index(vaddr);
143
144 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) {
145 for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
146 pmd_idx++) {
147 if ((vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin &&
148 (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end)
149 count++;
150 vaddr += PMD_SIZE;
151 }
152 pmd_idx = 0;
153 }
154#endif
155 return count;
156}
157
158static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
159 unsigned long vaddr, pte_t *lastpte,
160 void **adr)
161{
162#ifdef CONFIG_HIGHMEM
163
164
165
166
167
168
169 int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
170 int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
171
172 if (pmd_idx_kmap_begin != pmd_idx_kmap_end
173 && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin
174 && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) {
175 pte_t *newpte;
176 int i;
177
178 BUG_ON(after_bootmem);
179 newpte = *adr;
180 for (i = 0; i < PTRS_PER_PTE; i++)
181 set_pte(newpte + i, pte[i]);
182 *adr = (void *)(((unsigned long)(*adr)) + PAGE_SIZE);
183
184 paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT);
185 set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE));
186 BUG_ON(newpte != pte_offset_kernel(pmd, 0));
187 __flush_tlb_all();
188
189 paravirt_release_pte(__pa(pte) >> PAGE_SHIFT);
190 pte = newpte;
191 }
192 BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)
193 && vaddr > fix_to_virt(FIX_KMAP_END)
194 && lastpte && lastpte + PTRS_PER_PTE != pte);
195#endif
196 return pte;
197}
198
199
200
201
202
203
204
205
206
207
208static void __init
209page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
210{
211 int pgd_idx, pmd_idx;
212 unsigned long vaddr;
213 pgd_t *pgd;
214 pmd_t *pmd;
215 pte_t *pte = NULL;
216 unsigned long count = page_table_range_init_count(start, end);
217 void *adr = NULL;
218
219 if (count)
220 adr = alloc_low_pages(count);
221
222 vaddr = start;
223 pgd_idx = pgd_index(vaddr);
224 pmd_idx = pmd_index(vaddr);
225 pgd = pgd_base + pgd_idx;
226
227 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
228 pmd = one_md_table_init(pgd);
229 pmd = pmd + pmd_index(vaddr);
230 for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
231 pmd++, pmd_idx++) {
232 pte = page_table_kmap_check(one_page_table_init(pmd),
233 pmd, vaddr, pte, &adr);
234
235 vaddr += PMD_SIZE;
236 }
237 pmd_idx = 0;
238 }
239}
240
241
242
243
244
245static inline int __is_kernel_text(unsigned long addr)
246{
247 if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end)
248 return 1;
249 return 0;
250}
251
252
253
254
255
256
257unsigned long __init
258kernel_physical_mapping_init(unsigned long start,
259 unsigned long end,
260 unsigned long page_size_mask,
261 pgprot_t prot)
262{
263 int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
264 unsigned long last_map_addr = end;
265 unsigned long start_pfn, end_pfn;
266 pgd_t *pgd_base = swapper_pg_dir;
267 int pgd_idx, pmd_idx, pte_ofs;
268 unsigned long pfn;
269 pgd_t *pgd;
270 pmd_t *pmd;
271 pte_t *pte;
272 unsigned pages_2m, pages_4k;
273 int mapping_iter;
274
275 start_pfn = start >> PAGE_SHIFT;
276 end_pfn = end >> PAGE_SHIFT;
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292 mapping_iter = 1;
293
294 if (!boot_cpu_has(X86_FEATURE_PSE))
295 use_pse = 0;
296
297repeat:
298 pages_2m = pages_4k = 0;
299 pfn = start_pfn;
300 pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
301 pgd = pgd_base + pgd_idx;
302 for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
303 pmd = one_md_table_init(pgd);
304
305 if (pfn >= end_pfn)
306 continue;
307#ifdef CONFIG_X86_PAE
308 pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
309 pmd += pmd_idx;
310#else
311 pmd_idx = 0;
312#endif
313 for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
314 pmd++, pmd_idx++) {
315 unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
316
317
318
319
320
321 if (use_pse) {
322 unsigned int addr2;
323 pgprot_t prot = PAGE_KERNEL_LARGE;
324
325
326
327
328 pgprot_t init_prot =
329 __pgprot(PTE_IDENT_ATTR |
330 _PAGE_PSE);
331
332 pfn &= PMD_MASK >> PAGE_SHIFT;
333 addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
334 PAGE_OFFSET + PAGE_SIZE-1;
335
336 if (__is_kernel_text(addr) ||
337 __is_kernel_text(addr2))
338 prot = PAGE_KERNEL_LARGE_EXEC;
339
340 pages_2m++;
341 if (mapping_iter == 1)
342 set_pmd(pmd, pfn_pmd(pfn, init_prot));
343 else
344 set_pmd(pmd, pfn_pmd(pfn, prot));
345
346 pfn += PTRS_PER_PTE;
347 continue;
348 }
349 pte = one_page_table_init(pmd);
350
351 pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
352 pte += pte_ofs;
353 for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
354 pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
355 pgprot_t prot = PAGE_KERNEL;
356
357
358
359
360 pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);
361
362 if (__is_kernel_text(addr))
363 prot = PAGE_KERNEL_EXEC;
364
365 pages_4k++;
366 if (mapping_iter == 1) {
367 set_pte(pte, pfn_pte(pfn, init_prot));
368 last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
369 } else
370 set_pte(pte, pfn_pte(pfn, prot));
371 }
372 }
373 }
374 if (mapping_iter == 1) {
375
376
377
378
379 update_page_count(PG_LEVEL_2M, pages_2m);
380 update_page_count(PG_LEVEL_4K, pages_4k);
381
382
383
384
385
386 __flush_tlb_all();
387
388
389
390
391 mapping_iter = 2;
392 goto repeat;
393 }
394 return last_map_addr;
395}
396
397#ifdef CONFIG_HIGHMEM
398static void __init permanent_kmaps_init(pgd_t *pgd_base)
399{
400 unsigned long vaddr = PKMAP_BASE;
401
402 page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
403
404 pkmap_page_table = virt_to_kpte(vaddr);
405}
406
407void __init add_highpages_with_active_regions(int nid,
408 unsigned long start_pfn, unsigned long end_pfn)
409{
410 phys_addr_t start, end;
411 u64 i;
412
413 for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &start, &end, NULL) {
414 unsigned long pfn = clamp_t(unsigned long, PFN_UP(start),
415 start_pfn, end_pfn);
416 unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end),
417 start_pfn, end_pfn);
418 for ( ; pfn < e_pfn; pfn++)
419 if (pfn_valid(pfn))
420 free_highmem_page(pfn_to_page(pfn));
421 }
422}
423#else
424static inline void permanent_kmaps_init(pgd_t *pgd_base)
425{
426}
427#endif
428
429void __init sync_initial_page_table(void)
430{
431 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
432 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
433 KERNEL_PGD_PTRS);
434
435
436
437
438
439 clone_pgd_range(initial_page_table,
440 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
441 min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
442}
443
444void __init native_pagetable_init(void)
445{
446 unsigned long pfn, va;
447 pgd_t *pgd, *base = swapper_pg_dir;
448 p4d_t *p4d;
449 pud_t *pud;
450 pmd_t *pmd;
451 pte_t *pte;
452
453
454
455
456
457
458
459
460
461
462 for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) {
463 va = PAGE_OFFSET + (pfn<<PAGE_SHIFT);
464 pgd = base + pgd_index(va);
465 if (!pgd_present(*pgd))
466 break;
467
468 p4d = p4d_offset(pgd, va);
469 pud = pud_offset(p4d, va);
470 pmd = pmd_offset(pud, va);
471 if (!pmd_present(*pmd))
472 break;
473
474
475 if (pmd_large(*pmd)) {
476 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",
477 pfn, pmd, __pa(pmd));
478 BUG_ON(1);
479 }
480
481 pte = pte_offset_kernel(pmd, va);
482 if (!pte_present(*pte))
483 break;
484
485 printk(KERN_DEBUG "clearing pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx pte: %p pte phys: %lx\n",
486 pfn, pmd, __pa(pmd), pte, __pa(pte));
487 pte_clear(NULL, va, pte);
488 }
489 paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT);
490 paging_init();
491}
492
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510
511
512void __init early_ioremap_page_table_range_init(void)
513{
514 pgd_t *pgd_base = swapper_pg_dir;
515 unsigned long vaddr, end;
516
517
518
519
520
521 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
522 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
523 page_table_range_init(vaddr, end, pgd_base);
524 early_ioremap_reset();
525}
526
527static void __init pagetable_init(void)
528{
529 pgd_t *pgd_base = swapper_pg_dir;
530
531 permanent_kmaps_init(pgd_base);
532}
533
534#define DEFAULT_PTE_MASK ~(_PAGE_NX | _PAGE_GLOBAL)
535
536pteval_t __supported_pte_mask __read_mostly = DEFAULT_PTE_MASK;
537
538pteval_t __default_kernel_pte_mask __read_mostly = DEFAULT_PTE_MASK;
539EXPORT_SYMBOL_GPL(__supported_pte_mask);
540
541EXPORT_SYMBOL(__default_kernel_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_NUMA
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_MAX, &memblock.memory, 0);
669
670#ifdef CONFIG_FLATMEM
671 max_mapnr = IS_ENABLED(CONFIG_HIGHMEM) ? highend_pfn : max_low_pfn;
672#endif
673 __vmalloc_start_set = true;
674
675 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
676 pages_to_mb(max_low_pfn));
677
678 setup_bootmem_allocator();
679}
680#endif
681
682void __init setup_bootmem_allocator(void)
683{
684 printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
685 max_pfn_mapped<<PAGE_SHIFT);
686 printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
687}
688
689
690
691
692
693
694
695
696void __init paging_init(void)
697{
698 pagetable_init();
699
700 __flush_tlb_all();
701
702
703
704
705 olpc_dt_build_devicetree();
706 sparse_init();
707 zone_sizes_init();
708}
709
710
711
712
713
714
715
716static void __init test_wp_bit(void)
717{
718 char z = 0;
719
720 printk(KERN_INFO "Checking if this processor honours the WP bit even in supervisor mode...");
721
722 __set_fixmap(FIX_WP_TEST, __pa_symbol(empty_zero_page), PAGE_KERNEL_RO);
723
724 if (copy_to_kernel_nofault((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
725 clear_fixmap(FIX_WP_TEST);
726 printk(KERN_CONT "Ok.\n");
727 return;
728 }
729
730 printk(KERN_CONT "No.\n");
731 panic("Linux doesn't support CPUs with broken WP.");
732}
733
734void __init mem_init(void)
735{
736 pci_iommu_alloc();
737
738#ifdef CONFIG_FLATMEM
739 BUG_ON(!mem_map);
740#endif
741
742
743
744
745
746
747
748
749
750 set_highmem_pages_init();
751
752
753 memblock_free_all();
754
755 after_bootmem = 1;
756 x86_init.hyper.init_after_bootmem();
757
758
759
760
761
762#define __FIXADDR_TOP (-PAGE_SIZE)
763#ifdef CONFIG_HIGHMEM
764 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
765 BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE);
766#endif
767#define high_memory (-128UL << 20)
768 BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
769#undef high_memory
770#undef __FIXADDR_TOP
771
772#ifdef CONFIG_HIGHMEM
773 BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
774 BUG_ON(VMALLOC_END > PKMAP_BASE);
775#endif
776 BUG_ON(VMALLOC_START >= VMALLOC_END);
777 BUG_ON((unsigned long)high_memory > VMALLOC_START);
778
779 test_wp_bit();
780}
781
782#ifdef CONFIG_MEMORY_HOTPLUG
783int arch_add_memory(int nid, u64 start, u64 size,
784 struct mhp_params *params)
785{
786 unsigned long start_pfn = start >> PAGE_SHIFT;
787 unsigned long nr_pages = size >> PAGE_SHIFT;
788 int ret;
789
790
791
792
793
794
795 if (params->pgprot.pgprot != PAGE_KERNEL.pgprot) {
796 ret = __set_memory_prot(start, nr_pages, params->pgprot);
797 if (ret)
798 return ret;
799 }
800
801 return __add_pages(nid, start_pfn, nr_pages, params);
802}
803
804void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
805{
806 unsigned long start_pfn = start >> PAGE_SHIFT;
807 unsigned long nr_pages = size >> PAGE_SHIFT;
808
809 __remove_pages(start_pfn, nr_pages, altmap);
810}
811#endif
812
813int kernel_set_to_readonly __read_mostly;
814
815static void mark_nxdata_nx(void)
816{
817
818
819
820
821 unsigned long start = PFN_ALIGN(_etext);
822
823
824
825 unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;
826
827 if (__supported_pte_mask & _PAGE_NX)
828 printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10);
829 set_memory_nx(start, size >> PAGE_SHIFT);
830}
831
832void mark_rodata_ro(void)
833{
834 unsigned long start = PFN_ALIGN(_text);
835 unsigned long size = (unsigned long)__end_rodata - start;
836
837 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
838 pr_info("Write protecting kernel text and read-only data: %luk\n",
839 size >> 10);
840
841 kernel_set_to_readonly = 1;
842
843#ifdef CONFIG_CPA_DEBUG
844 pr_info("Testing CPA: Reverting %lx-%lx\n", start, start + size);
845 set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
846
847 pr_info("Testing CPA: write protecting again\n");
848 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
849#endif
850 mark_nxdata_nx();
851 if (__supported_pte_mask & _PAGE_NX)
852 debug_checkwx();
853}
854