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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/swap.h>
19#include <linux/smp.h>
20#include <linux/init.h>
21#include <linux/initrd.h>
22#include <linux/pagemap.h>
23#include <linux/bootmem.h>
24#include <linux/proc_fs.h>
25#include <linux/pci.h>
26#include <linux/pfn.h>
27#include <linux/poison.h>
28#include <linux/dma-mapping.h>
29#include <linux/module.h>
30#include <linux/memory_hotplug.h>
31#include <linux/nmi.h>
32
33#include <asm/processor.h>
34#include <asm/bios_ebda.h>
35#include <asm/system.h>
36#include <asm/uaccess.h>
37#include <asm/pgtable.h>
38#include <asm/pgalloc.h>
39#include <asm/dma.h>
40#include <asm/fixmap.h>
41#include <asm/e820.h>
42#include <asm/apic.h>
43#include <asm/tlb.h>
44#include <asm/mmu_context.h>
45#include <asm/proto.h>
46#include <asm/smp.h>
47#include <asm/sections.h>
48#include <asm/kdebug.h>
49#include <asm/numa.h>
50#include <asm/cacheflush.h>
51#include <asm/init.h>
52
53static unsigned long dma_reserve __initdata;
54
55static int __init parse_direct_gbpages_off(char *arg)
56{
57 direct_gbpages = 0;
58 return 0;
59}
60early_param("nogbpages", parse_direct_gbpages_off);
61
62static int __init parse_direct_gbpages_on(char *arg)
63{
64 direct_gbpages = 1;
65 return 0;
66}
67early_param("gbpages", parse_direct_gbpages_on);
68
69
70
71
72
73
74
75pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
76EXPORT_SYMBOL_GPL(__supported_pte_mask);
77
78int force_personality32;
79
80
81
82
83
84
85
86
87
88static int __init nonx32_setup(char *str)
89{
90 if (!strcmp(str, "on"))
91 force_personality32 &= ~READ_IMPLIES_EXEC;
92 else if (!strcmp(str, "off"))
93 force_personality32 |= READ_IMPLIES_EXEC;
94 return 1;
95}
96__setup("noexec32=", nonx32_setup);
97
98
99
100
101
102static __ref void *spp_getpage(void)
103{
104 void *ptr;
105
106 if (after_bootmem)
107 ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
108 else
109 ptr = alloc_bootmem_pages(PAGE_SIZE);
110
111 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
112 panic("set_pte_phys: cannot allocate page data %s\n",
113 after_bootmem ? "after bootmem" : "");
114 }
115
116 pr_debug("spp_getpage %p\n", ptr);
117
118 return ptr;
119}
120
121static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
122{
123 if (pgd_none(*pgd)) {
124 pud_t *pud = (pud_t *)spp_getpage();
125 pgd_populate(&init_mm, pgd, pud);
126 if (pud != pud_offset(pgd, 0))
127 printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
128 pud, pud_offset(pgd, 0));
129 }
130 return pud_offset(pgd, vaddr);
131}
132
133static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
134{
135 if (pud_none(*pud)) {
136 pmd_t *pmd = (pmd_t *) spp_getpage();
137 pud_populate(&init_mm, pud, pmd);
138 if (pmd != pmd_offset(pud, 0))
139 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
140 pmd, pmd_offset(pud, 0));
141 }
142 return pmd_offset(pud, vaddr);
143}
144
145static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
146{
147 if (pmd_none(*pmd)) {
148 pte_t *pte = (pte_t *) spp_getpage();
149 pmd_populate_kernel(&init_mm, pmd, pte);
150 if (pte != pte_offset_kernel(pmd, 0))
151 printk(KERN_ERR "PAGETABLE BUG #02!\n");
152 }
153 return pte_offset_kernel(pmd, vaddr);
154}
155
156void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
157{
158 pud_t *pud;
159 pmd_t *pmd;
160 pte_t *pte;
161
162 pud = pud_page + pud_index(vaddr);
163 pmd = fill_pmd(pud, vaddr);
164 pte = fill_pte(pmd, vaddr);
165
166 set_pte(pte, new_pte);
167
168
169
170
171
172 __flush_tlb_one(vaddr);
173}
174
175void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
176{
177 pgd_t *pgd;
178 pud_t *pud_page;
179
180 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
181
182 pgd = pgd_offset_k(vaddr);
183 if (pgd_none(*pgd)) {
184 printk(KERN_ERR
185 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
186 return;
187 }
188 pud_page = (pud_t*)pgd_page_vaddr(*pgd);
189 set_pte_vaddr_pud(pud_page, vaddr, pteval);
190}
191
192pmd_t * __init populate_extra_pmd(unsigned long vaddr)
193{
194 pgd_t *pgd;
195 pud_t *pud;
196
197 pgd = pgd_offset_k(vaddr);
198 pud = fill_pud(pgd, vaddr);
199 return fill_pmd(pud, vaddr);
200}
201
202pte_t * __init populate_extra_pte(unsigned long vaddr)
203{
204 pmd_t *pmd;
205
206 pmd = populate_extra_pmd(vaddr);
207 return fill_pte(pmd, vaddr);
208}
209
210
211
212
213static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
214 pgprot_t prot)
215{
216 pgd_t *pgd;
217 pud_t *pud;
218 pmd_t *pmd;
219
220 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
221 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
222 pgd = pgd_offset_k((unsigned long)__va(phys));
223 if (pgd_none(*pgd)) {
224 pud = (pud_t *) spp_getpage();
225 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
226 _PAGE_USER));
227 }
228 pud = pud_offset(pgd, (unsigned long)__va(phys));
229 if (pud_none(*pud)) {
230 pmd = (pmd_t *) spp_getpage();
231 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
232 _PAGE_USER));
233 }
234 pmd = pmd_offset(pud, phys);
235 BUG_ON(!pmd_none(*pmd));
236 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
237 }
238}
239
240void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
241{
242 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE);
243}
244
245void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
246{
247 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
248}
249
250
251
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253
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259
260
261
262
263void __init cleanup_highmap(void)
264{
265 unsigned long vaddr = __START_KERNEL_map;
266 unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
267 pmd_t *pmd = level2_kernel_pgt;
268 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
269
270 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
271 if (pmd_none(*pmd))
272 continue;
273 if (vaddr < (unsigned long) _text || vaddr > end)
274 set_pmd(pmd, __pmd(0));
275 }
276}
277
278static __ref void *alloc_low_page(unsigned long *phys)
279{
280 unsigned long pfn = e820_table_end++;
281 void *adr;
282
283 if (after_bootmem) {
284 adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
285 *phys = __pa(adr);
286
287 return adr;
288 }
289
290 if (pfn >= e820_table_top)
291 panic("alloc_low_page: ran out of memory");
292
293 adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
294 memset(adr, 0, PAGE_SIZE);
295 *phys = pfn * PAGE_SIZE;
296 return adr;
297}
298
299static __ref void unmap_low_page(void *adr)
300{
301 if (after_bootmem)
302 return;
303
304 early_iounmap(adr, PAGE_SIZE);
305}
306
307static unsigned long __meminit
308phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
309 pgprot_t prot)
310{
311 unsigned pages = 0;
312 unsigned long last_map_addr = end;
313 int i;
314
315 pte_t *pte = pte_page + pte_index(addr);
316
317 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) {
318
319 if (addr >= end) {
320 if (!after_bootmem) {
321 for(; i < PTRS_PER_PTE; i++, pte++)
322 set_pte(pte, __pte(0));
323 }
324 break;
325 }
326
327
328
329
330
331
332
333 if (pte_val(*pte)) {
334 pages++;
335 continue;
336 }
337
338 if (0)
339 printk(" pte=%p addr=%lx pte=%016lx\n",
340 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
341 pages++;
342 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
343 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
344 }
345
346 update_page_count(PG_LEVEL_4K, pages);
347
348 return last_map_addr;
349}
350
351static unsigned long __meminit
352phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end,
353 pgprot_t prot)
354{
355 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd);
356
357 return phys_pte_init(pte, address, end, prot);
358}
359
360static unsigned long __meminit
361phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
362 unsigned long page_size_mask, pgprot_t prot)
363{
364 unsigned long pages = 0;
365 unsigned long last_map_addr = end;
366
367 int i = pmd_index(address);
368
369 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
370 unsigned long pte_phys;
371 pmd_t *pmd = pmd_page + pmd_index(address);
372 pte_t *pte;
373 pgprot_t new_prot = prot;
374
375 if (address >= end) {
376 if (!after_bootmem) {
377 for (; i < PTRS_PER_PMD; i++, pmd++)
378 set_pmd(pmd, __pmd(0));
379 }
380 break;
381 }
382
383 if (pmd_val(*pmd)) {
384 if (!pmd_large(*pmd)) {
385 spin_lock(&init_mm.page_table_lock);
386 last_map_addr = phys_pte_update(pmd, address,
387 end, prot);
388 spin_unlock(&init_mm.page_table_lock);
389 continue;
390 }
391
392
393
394
395
396
397
398
399
400
401
402
403 if (page_size_mask & (1 << PG_LEVEL_2M)) {
404 pages++;
405 continue;
406 }
407 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
408 }
409
410 if (page_size_mask & (1<<PG_LEVEL_2M)) {
411 pages++;
412 spin_lock(&init_mm.page_table_lock);
413 set_pte((pte_t *)pmd,
414 pfn_pte(address >> PAGE_SHIFT,
415 __pgprot(pgprot_val(prot) | _PAGE_PSE)));
416 spin_unlock(&init_mm.page_table_lock);
417 last_map_addr = (address & PMD_MASK) + PMD_SIZE;
418 continue;
419 }
420
421 pte = alloc_low_page(&pte_phys);
422 last_map_addr = phys_pte_init(pte, address, end, new_prot);
423 unmap_low_page(pte);
424
425 spin_lock(&init_mm.page_table_lock);
426 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));
427 spin_unlock(&init_mm.page_table_lock);
428 }
429 update_page_count(PG_LEVEL_2M, pages);
430 return last_map_addr;
431}
432
433static unsigned long __meminit
434phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end,
435 unsigned long page_size_mask, pgprot_t prot)
436{
437 pmd_t *pmd = pmd_offset(pud, 0);
438 unsigned long last_map_addr;
439
440 last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot);
441 __flush_tlb_all();
442 return last_map_addr;
443}
444
445static unsigned long __meminit
446phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
447 unsigned long page_size_mask)
448{
449 unsigned long pages = 0;
450 unsigned long last_map_addr = end;
451 int i = pud_index(addr);
452
453 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
454 unsigned long pmd_phys;
455 pud_t *pud = pud_page + pud_index(addr);
456 pmd_t *pmd;
457 pgprot_t prot = PAGE_KERNEL;
458
459 if (addr >= end)
460 break;
461
462 if (!after_bootmem &&
463 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
464 set_pud(pud, __pud(0));
465 continue;
466 }
467
468 if (pud_val(*pud)) {
469 if (!pud_large(*pud)) {
470 last_map_addr = phys_pmd_update(pud, addr, end,
471 page_size_mask, prot);
472 continue;
473 }
474
475
476
477
478
479
480
481
482
483
484
485
486 if (page_size_mask & (1 << PG_LEVEL_1G)) {
487 pages++;
488 continue;
489 }
490 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
491 }
492
493 if (page_size_mask & (1<<PG_LEVEL_1G)) {
494 pages++;
495 spin_lock(&init_mm.page_table_lock);
496 set_pte((pte_t *)pud,
497 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
498 spin_unlock(&init_mm.page_table_lock);
499 last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
500 continue;
501 }
502
503 pmd = alloc_low_page(&pmd_phys);
504 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
505 prot);
506 unmap_low_page(pmd);
507
508 spin_lock(&init_mm.page_table_lock);
509 pud_populate(&init_mm, pud, __va(pmd_phys));
510 spin_unlock(&init_mm.page_table_lock);
511 }
512 __flush_tlb_all();
513
514 update_page_count(PG_LEVEL_1G, pages);
515
516 return last_map_addr;
517}
518
519static unsigned long __meminit
520phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end,
521 unsigned long page_size_mask)
522{
523 pud_t *pud;
524
525 pud = (pud_t *)pgd_page_vaddr(*pgd);
526
527 return phys_pud_init(pud, addr, end, page_size_mask);
528}
529
530unsigned long __meminit
531kernel_physical_mapping_init(unsigned long start,
532 unsigned long end,
533 unsigned long page_size_mask)
534{
535
536 unsigned long next, last_map_addr = end;
537
538 start = (unsigned long)__va(start);
539 end = (unsigned long)__va(end);
540
541 for (; start < end; start = next) {
542 pgd_t *pgd = pgd_offset_k(start);
543 unsigned long pud_phys;
544 pud_t *pud;
545
546 next = (start + PGDIR_SIZE) & PGDIR_MASK;
547 if (next > end)
548 next = end;
549
550 if (pgd_val(*pgd)) {
551 last_map_addr = phys_pud_update(pgd, __pa(start),
552 __pa(end), page_size_mask);
553 continue;
554 }
555
556 pud = alloc_low_page(&pud_phys);
557 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
558 page_size_mask);
559 unmap_low_page(pud);
560
561 spin_lock(&init_mm.page_table_lock);
562 pgd_populate(&init_mm, pgd, __va(pud_phys));
563 spin_unlock(&init_mm.page_table_lock);
564 }
565 __flush_tlb_all();
566
567 return last_map_addr;
568}
569
570#ifndef CONFIG_NUMA
571void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
572{
573 unsigned long bootmap_size, bootmap;
574
575 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
576 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
577 PAGE_SIZE);
578 if (bootmap == -1L)
579 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
580
581 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
582 0, end_pfn);
583 e820_register_active_regions(0, start_pfn, end_pfn);
584 free_bootmem_with_active_regions(0, end_pfn);
585 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
586 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
587}
588#endif
589
590void __init paging_init(void)
591{
592 unsigned long max_zone_pfns[MAX_NR_ZONES];
593
594 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
595 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
596 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
597 max_zone_pfns[ZONE_NORMAL] = max_pfn;
598
599 sparse_memory_present_with_active_regions(MAX_NUMNODES);
600 sparse_init();
601
602
603
604
605
606
607
608 node_clear_state(0, N_NORMAL_MEMORY);
609
610 free_area_init_nodes(max_zone_pfns);
611}
612
613
614
615
616#ifdef CONFIG_MEMORY_HOTPLUG
617
618
619
620
621int arch_add_memory(int nid, u64 start, u64 size)
622{
623 struct pglist_data *pgdat = NODE_DATA(nid);
624 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
625 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
626 unsigned long nr_pages = size >> PAGE_SHIFT;
627 int ret;
628
629 last_mapped_pfn = init_memory_mapping(start, start + size);
630 if (last_mapped_pfn > max_pfn_mapped)
631 max_pfn_mapped = last_mapped_pfn;
632
633 ret = __add_pages(nid, zone, start_pfn, nr_pages);
634 WARN_ON_ONCE(ret);
635
636 return ret;
637}
638EXPORT_SYMBOL_GPL(arch_add_memory);
639
640#if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
641int memory_add_physaddr_to_nid(u64 start)
642{
643 return 0;
644}
645EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
646#endif
647
648#endif
649
650static struct kcore_list kcore_vsyscall;
651
652void __init mem_init(void)
653{
654 long codesize, reservedpages, datasize, initsize;
655 unsigned long absent_pages;
656
657 pci_iommu_alloc();
658
659
660
661 reservedpages = 0;
662
663
664#ifdef CONFIG_NUMA
665 totalram_pages = numa_free_all_bootmem();
666#else
667 totalram_pages = free_all_bootmem();
668#endif
669
670 absent_pages = absent_pages_in_range(0, max_pfn);
671 reservedpages = max_pfn - totalram_pages - absent_pages;
672 after_bootmem = 1;
673
674 codesize = (unsigned long) &_etext - (unsigned long) &_text;
675 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
676 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
677
678
679 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
680 VSYSCALL_END - VSYSCALL_START, KCORE_OTHER);
681
682 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
683 "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
684 nr_free_pages() << (PAGE_SHIFT-10),
685 max_pfn << (PAGE_SHIFT-10),
686 codesize >> 10,
687 absent_pages << (PAGE_SHIFT-10),
688 reservedpages << (PAGE_SHIFT-10),
689 datasize >> 10,
690 initsize >> 10);
691}
692
693#ifdef CONFIG_DEBUG_RODATA
694const int rodata_test_data = 0xC3;
695EXPORT_SYMBOL_GPL(rodata_test_data);
696
697static int kernel_set_to_readonly;
698
699void set_kernel_text_rw(void)
700{
701 unsigned long start = PFN_ALIGN(_stext);
702 unsigned long end = PFN_ALIGN(__start_rodata);
703
704 if (!kernel_set_to_readonly)
705 return;
706
707 pr_debug("Set kernel text: %lx - %lx for read write\n",
708 start, end);
709
710 set_memory_rw(start, (end - start) >> PAGE_SHIFT);
711}
712
713void set_kernel_text_ro(void)
714{
715 unsigned long start = PFN_ALIGN(_stext);
716 unsigned long end = PFN_ALIGN(__start_rodata);
717
718 if (!kernel_set_to_readonly)
719 return;
720
721 pr_debug("Set kernel text: %lx - %lx for read only\n",
722 start, end);
723
724 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
725}
726
727void mark_rodata_ro(void)
728{
729 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
730 unsigned long rodata_start =
731 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
732
733 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
734 (end - start) >> 10);
735 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
736
737 kernel_set_to_readonly = 1;
738
739
740
741
742
743 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT);
744
745 rodata_test();
746
747#ifdef CONFIG_CPA_DEBUG
748 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
749 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
750
751 printk(KERN_INFO "Testing CPA: again\n");
752 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
753#endif
754}
755
756#endif
757
758int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
759 int flags)
760{
761#ifdef CONFIG_NUMA
762 int nid, next_nid;
763 int ret;
764#endif
765 unsigned long pfn = phys >> PAGE_SHIFT;
766
767 if (pfn >= max_pfn) {
768
769
770
771
772 if (pfn < max_pfn_mapped)
773 return -EFAULT;
774
775 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n",
776 phys, len);
777 return -EFAULT;
778 }
779
780
781#ifdef CONFIG_NUMA
782 nid = phys_to_nid(phys);
783 next_nid = phys_to_nid(phys + len - 1);
784 if (nid == next_nid)
785 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags);
786 else
787 ret = reserve_bootmem(phys, len, flags);
788
789 if (ret != 0)
790 return ret;
791
792#else
793 reserve_bootmem(phys, len, flags);
794#endif
795
796 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
797 dma_reserve += len / PAGE_SIZE;
798 set_dma_reserve(dma_reserve);
799 }
800
801 return 0;
802}
803
804int kern_addr_valid(unsigned long addr)
805{
806 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
807 pgd_t *pgd;
808 pud_t *pud;
809 pmd_t *pmd;
810 pte_t *pte;
811
812 if (above != 0 && above != -1UL)
813 return 0;
814
815 pgd = pgd_offset_k(addr);
816 if (pgd_none(*pgd))
817 return 0;
818
819 pud = pud_offset(pgd, addr);
820 if (pud_none(*pud))
821 return 0;
822
823 pmd = pmd_offset(pud, addr);
824 if (pmd_none(*pmd))
825 return 0;
826
827 if (pmd_large(*pmd))
828 return pfn_valid(pmd_pfn(*pmd));
829
830 pte = pte_offset_kernel(pmd, addr);
831 if (pte_none(*pte))
832 return 0;
833
834 return pfn_valid(pte_pfn(*pte));
835}
836
837
838
839
840
841
842static struct vm_area_struct gate_vma = {
843 .vm_start = VSYSCALL_START,
844 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
845 .vm_page_prot = PAGE_READONLY_EXEC,
846 .vm_flags = VM_READ | VM_EXEC
847};
848
849struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
850{
851#ifdef CONFIG_IA32_EMULATION
852 if (test_tsk_thread_flag(tsk, TIF_IA32))
853 return NULL;
854#endif
855 return &gate_vma;
856}
857
858int in_gate_area(struct task_struct *task, unsigned long addr)
859{
860 struct vm_area_struct *vma = get_gate_vma(task);
861
862 if (!vma)
863 return 0;
864
865 return (addr >= vma->vm_start) && (addr < vma->vm_end);
866}
867
868
869
870
871
872
873int in_gate_area_no_task(unsigned long addr)
874{
875 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
876}
877
878const char *arch_vma_name(struct vm_area_struct *vma)
879{
880 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
881 return "[vdso]";
882 if (vma == &gate_vma)
883 return "[vsyscall]";
884 return NULL;
885}
886
887#ifdef CONFIG_SPARSEMEM_VMEMMAP
888
889
890
891static long __meminitdata addr_start, addr_end;
892static void __meminitdata *p_start, *p_end;
893static int __meminitdata node_start;
894
895int __meminit
896vmemmap_populate(struct page *start_page, unsigned long size, int node)
897{
898 unsigned long addr = (unsigned long)start_page;
899 unsigned long end = (unsigned long)(start_page + size);
900 unsigned long next;
901 pgd_t *pgd;
902 pud_t *pud;
903 pmd_t *pmd;
904
905 for (; addr < end; addr = next) {
906 void *p = NULL;
907
908 pgd = vmemmap_pgd_populate(addr, node);
909 if (!pgd)
910 return -ENOMEM;
911
912 pud = vmemmap_pud_populate(pgd, addr, node);
913 if (!pud)
914 return -ENOMEM;
915
916 if (!cpu_has_pse) {
917 next = (addr + PAGE_SIZE) & PAGE_MASK;
918 pmd = vmemmap_pmd_populate(pud, addr, node);
919
920 if (!pmd)
921 return -ENOMEM;
922
923 p = vmemmap_pte_populate(pmd, addr, node);
924
925 if (!p)
926 return -ENOMEM;
927
928 addr_end = addr + PAGE_SIZE;
929 p_end = p + PAGE_SIZE;
930 } else {
931 next = pmd_addr_end(addr, end);
932
933 pmd = pmd_offset(pud, addr);
934 if (pmd_none(*pmd)) {
935 pte_t entry;
936
937 p = vmemmap_alloc_block(PMD_SIZE, node);
938 if (!p)
939 return -ENOMEM;
940
941 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
942 PAGE_KERNEL_LARGE);
943 set_pmd(pmd, __pmd(pte_val(entry)));
944
945
946 if (p_end != p || node_start != node) {
947 if (p_start)
948 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
949 addr_start, addr_end-1, p_start, p_end-1, node_start);
950 addr_start = addr;
951 node_start = node;
952 p_start = p;
953 }
954
955 addr_end = addr + PMD_SIZE;
956 p_end = p + PMD_SIZE;
957 } else
958 vmemmap_verify((pte_t *)pmd, node, addr, next);
959 }
960
961 }
962 return 0;
963}
964
965void __meminit vmemmap_populate_print_last(void)
966{
967 if (p_start) {
968 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
969 addr_start, addr_end-1, p_start, p_end-1, node_start);
970 p_start = NULL;
971 p_end = NULL;
972 node_start = 0;
973 }
974}
975#endif
976