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x86: replace the now useless max_pfn_mapped define
[linux-2.6/x86.git] / arch / x86 / mm / init_64.c
blobef9e9cfb1fc2a39df01dacfbe7f351e3c7032493
1 /*
2 * linux/arch/x86_64/mm/init.c
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 2000 Pavel Machek <pavel@suse.cz>
6 * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
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/swap.h>
19 #include <linux/smp.h>
20 #include <linux/init.h>
21 #include <linux/pagemap.h>
22 #include <linux/bootmem.h>
23 #include <linux/proc_fs.h>
24 #include <linux/pci.h>
25 #include <linux/pfn.h>
26 #include <linux/poison.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/module.h>
29 #include <linux/memory_hotplug.h>
30 #include <linux/nmi.h>
31
32 #include <asm/processor.h>
33 #include <asm/system.h>
34 #include <asm/uaccess.h>
35 #include <asm/pgtable.h>
36 #include <asm/pgalloc.h>
37 #include <asm/dma.h>
38 #include <asm/fixmap.h>
39 #include <asm/e820.h>
40 #include <asm/apic.h>
41 #include <asm/tlb.h>
42 #include <asm/mmu_context.h>
43 #include <asm/proto.h>
44 #include <asm/smp.h>
45 #include <asm/sections.h>
46 #include <asm/kdebug.h>
47 #include <asm/numa.h>
48 #include <asm/cacheflush.h>
49
50 const struct dma_mapping_ops *dma_ops;
51 EXPORT_SYMBOL(dma_ops);
52
53 static unsigned long dma_reserve __initdata;
54
55 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
56
57 int direct_gbpages __meminitdata
58 #ifdef CONFIG_DIRECT_GBPAGES
59 = 1
60 #endif
61 ;
62
63 static int __init parse_direct_gbpages_off(char *arg)
64 {
65 direct_gbpages = 0;
66 return 0;
67 }
68 early_param("nogbpages", parse_direct_gbpages_off);
69
70 static int __init parse_direct_gbpages_on(char *arg)
71 {
72 direct_gbpages = 1;
73 return 0;
74 }
75 early_param("gbpages", parse_direct_gbpages_on);
76
77 /*
78 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
79 * physical space so we can cache the place of the first one and move
80 * around without checking the pgd every time.
81 */
82
83 void show_mem(void)
84 {
85 long i, total = 0, reserved = 0;
86 long shared = 0, cached = 0;
87 struct page *page;
88 pg_data_t *pgdat;
89
90 printk(KERN_INFO "Mem-info:\n");
91 show_free_areas();
92 for_each_online_pgdat(pgdat) {
93 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
94 /*
95 * This loop can take a while with 256 GB and
96 * 4k pages so defer the NMI watchdog:
97 */
98 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
99 touch_nmi_watchdog();
100
101 if (!pfn_valid(pgdat->node_start_pfn + i))
102 continue;
103
104 page = pfn_to_page(pgdat->node_start_pfn + i);
105 total++;
106 if (PageReserved(page))
107 reserved++;
108 else if (PageSwapCache(page))
109 cached++;
110 else if (page_count(page))
111 shared += page_count(page) - 1;
112 }
113 }
114 printk(KERN_INFO "%lu pages of RAM\n", total);
115 printk(KERN_INFO "%lu reserved pages\n", reserved);
116 printk(KERN_INFO "%lu pages shared\n", shared);
117 printk(KERN_INFO "%lu pages swap cached\n", cached);
118 }
119
120 int after_bootmem;
121
122 static __init void *spp_getpage(void)
123 {
124 void *ptr;
125
126 if (after_bootmem)
127 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
128 else
129 ptr = alloc_bootmem_pages(PAGE_SIZE);
130
131 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
132 panic("set_pte_phys: cannot allocate page data %s\n",
133 after_bootmem ? "after bootmem" : "");
134 }
135
136 pr_debug("spp_getpage %p\n", ptr);
137
138 return ptr;
139 }
140
141 static __init void
142 set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot)
143 {
144 pgd_t *pgd;
145 pud_t *pud;
146 pmd_t *pmd;
147 pte_t *pte, new_pte;
148
149 pr_debug("set_pte_phys %lx to %lx\n", vaddr, phys);
150
151 pgd = pgd_offset_k(vaddr);
152 if (pgd_none(*pgd)) {
153 printk(KERN_ERR
154 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
155 return;
156 }
157 pud = pud_offset(pgd, vaddr);
158 if (pud_none(*pud)) {
159 pmd = (pmd_t *) spp_getpage();
160 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
161 if (pmd != pmd_offset(pud, 0)) {
162 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
163 pmd, pmd_offset(pud, 0));
164 return;
165 }
166 }
167 pmd = pmd_offset(pud, vaddr);
168 if (pmd_none(*pmd)) {
169 pte = (pte_t *) spp_getpage();
170 set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
171 if (pte != pte_offset_kernel(pmd, 0)) {
172 printk(KERN_ERR "PAGETABLE BUG #02!\n");
173 return;
174 }
175 }
176 new_pte = pfn_pte(phys >> PAGE_SHIFT, prot);
177
178 pte = pte_offset_kernel(pmd, vaddr);
179 if (!pte_none(*pte) &&
180 pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
181 pte_ERROR(*pte);
182 set_pte(pte, new_pte);
183
184 /*
185 * It's enough to flush this one mapping.
186 * (PGE mappings get flushed as well)
187 */
188 __flush_tlb_one(vaddr);
189 }
190
191 /*
192 * The head.S code sets up the kernel high mapping:
193 *
194 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
195 *
196 * phys_addr holds the negative offset to the kernel, which is added
197 * to the compile time generated pmds. This results in invalid pmds up
198 * to the point where we hit the physaddr 0 mapping.
199 *
200 * We limit the mappings to the region from _text to _end. _end is
201 * rounded up to the 2MB boundary. This catches the invalid pmds as
202 * well, as they are located before _text:
203 */
204 void __init cleanup_highmap(void)
205 {
206 unsigned long vaddr = __START_KERNEL_map;
207 unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1;
208 pmd_t *pmd = level2_kernel_pgt;
209 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
210
211 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
212 if (!pmd_present(*pmd))
213 continue;
214 if (vaddr < (unsigned long) _text || vaddr > end)
215 set_pmd(pmd, __pmd(0));
216 }
217 }
218
219 /* NOTE: this is meant to be run only at boot */
220 void __init
221 __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
222 {
223 unsigned long address = __fix_to_virt(idx);
224
225 if (idx >= __end_of_fixed_addresses) {
226 printk(KERN_ERR "Invalid __set_fixmap\n");
227 return;
228 }
229 set_pte_phys(address, phys, prot);
230 }
231
232 static unsigned long __initdata table_start;
233 static unsigned long __meminitdata table_end;
234
235 static __meminit void *alloc_low_page(unsigned long *phys)
236 {
237 unsigned long pfn = table_end++;
238 void *adr;
239
240 if (after_bootmem) {
241 adr = (void *)get_zeroed_page(GFP_ATOMIC);
242 *phys = __pa(adr);
243
244 return adr;
245 }
246
247 if (pfn >= end_pfn)
248 panic("alloc_low_page: ran out of memory");
249
250 adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
251 memset(adr, 0, PAGE_SIZE);
252 *phys = pfn * PAGE_SIZE;
253 return adr;
254 }
255
256 static __meminit void unmap_low_page(void *adr)
257 {
258 if (after_bootmem)
259 return;
260
261 early_iounmap(adr, PAGE_SIZE);
262 }
263
264 /* Must run before zap_low_mappings */
265 __meminit void *early_ioremap(unsigned long addr, unsigned long size)
266 {
267 pmd_t *pmd, *last_pmd;
268 unsigned long vaddr;
269 int i, pmds;
270
271 pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
272 vaddr = __START_KERNEL_map;
273 pmd = level2_kernel_pgt;
274 last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1;
275
276 for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) {
277 for (i = 0; i < pmds; i++) {
278 if (pmd_present(pmd[i]))
279 goto continue_outer_loop;
280 }
281 vaddr += addr & ~PMD_MASK;
282 addr &= PMD_MASK;
283
284 for (i = 0; i < pmds; i++, addr += PMD_SIZE)
285 set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
286 __flush_tlb_all();
287
288 return (void *)vaddr;
289 continue_outer_loop:
290 ;
291 }
292 printk(KERN_ERR "early_ioremap(0x%lx, %lu) failed\n", addr, size);
293
294 return NULL;
295 }
296
297 /*
298 * To avoid virtual aliases later:
299 */
300 __meminit void early_iounmap(void *addr, unsigned long size)
301 {
302 unsigned long vaddr;
303 pmd_t *pmd;
304 int i, pmds;
305
306 vaddr = (unsigned long)addr;
307 pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
308 pmd = level2_kernel_pgt + pmd_index(vaddr);
309
310 for (i = 0; i < pmds; i++)
311 pmd_clear(pmd + i);
312
313 __flush_tlb_all();
314 }
315
316 static void __meminit
317 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
318 {
319 int i = pmd_index(address);
320
321 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
322 pmd_t *pmd = pmd_page + pmd_index(address);
323
324 if (address >= end) {
325 if (!after_bootmem) {
326 for (; i < PTRS_PER_PMD; i++, pmd++)
327 set_pmd(pmd, __pmd(0));
328 }
329 break;
330 }
331
332 if (pmd_val(*pmd))
333 continue;
334
335 set_pte((pte_t *)pmd,
336 pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
337 }
338 }
339
340 static void __meminit
341 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
342 {
343 pmd_t *pmd = pmd_offset(pud, 0);
344 spin_lock(&init_mm.page_table_lock);
345 phys_pmd_init(pmd, address, end);
346 spin_unlock(&init_mm.page_table_lock);
347 __flush_tlb_all();
348 }
349
350 static void __meminit
351 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
352 {
353 int i = pud_index(addr);
354
355 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
356 unsigned long pmd_phys;
357 pud_t *pud = pud_page + pud_index(addr);
358 pmd_t *pmd;
359
360 if (addr >= end)
361 break;
362
363 if (!after_bootmem &&
364 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
365 set_pud(pud, __pud(0));
366 continue;
367 }
368
369 if (pud_val(*pud)) {
370 if (!pud_large(*pud))
371 phys_pmd_update(pud, addr, end);
372 continue;
373 }
374
375 if (direct_gbpages) {
376 set_pte((pte_t *)pud,
377 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
378 continue;
379 }
380
381 pmd = alloc_low_page(&pmd_phys);
382
383 spin_lock(&init_mm.page_table_lock);
384 set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
385 phys_pmd_init(pmd, addr, end);
386 spin_unlock(&init_mm.page_table_lock);
387
388 unmap_low_page(pmd);
389 }
390 __flush_tlb_all();
391 }
392
393 static void __init find_early_table_space(unsigned long end)
394 {
395 unsigned long puds, pmds, tables, start;
396
397 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
398 tables = round_up(puds * sizeof(pud_t), PAGE_SIZE);
399 if (!direct_gbpages) {
400 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
401 tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
402 }
403
404 /*
405 * RED-PEN putting page tables only on node 0 could
406 * cause a hotspot and fill up ZONE_DMA. The page tables
407 * need roughly 0.5KB per GB.
408 */
409 start = 0x8000;
410 table_start = find_e820_area(start, end, tables, PAGE_SIZE);
411 if (table_start == -1UL)
412 panic("Cannot find space for the kernel page tables");
413
414 table_start >>= PAGE_SHIFT;
415 table_end = table_start;
416
417 early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n",
418 end, table_start << PAGE_SHIFT,
419 (table_start << PAGE_SHIFT) + tables);
420 }
421
422 static void __init init_gbpages(void)
423 {
424 if (direct_gbpages && cpu_has_gbpages)
425 printk(KERN_INFO "Using GB pages for direct mapping\n");
426 else
427 direct_gbpages = 0;
428 }
429
430 #ifdef CONFIG_MEMTEST_BOOTPARAM
431
432 static void __init memtest(unsigned long start_phys, unsigned long size,
433 unsigned pattern)
434 {
435 unsigned long i;
436 unsigned long *start;
437 unsigned long start_bad;
438 unsigned long last_bad;
439 unsigned long val;
440 unsigned long start_phys_aligned;
441 unsigned long count;
442 unsigned long incr;
443
444 switch (pattern) {
445 case 0:
446 val = 0UL;
447 break;
448 case 1:
449 val = -1UL;
450 break;
451 case 2:
452 val = 0x5555555555555555UL;
453 break;
454 case 3:
455 val = 0xaaaaaaaaaaaaaaaaUL;
456 break;
457 default:
458 return;
459 }
460
461 incr = sizeof(unsigned long);
462 start_phys_aligned = ALIGN(start_phys, incr);
463 count = (size - (start_phys_aligned - start_phys))/incr;
464 start = __va(start_phys_aligned);
465 start_bad = 0;
466 last_bad = 0;
467
468 for (i = 0; i < count; i++)
469 start[i] = val;
470 for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
471 if (*start != val) {
472 if (start_phys_aligned == last_bad + incr) {
473 last_bad += incr;
474 } else {
475 if (start_bad) {
476 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved",
477 val, start_bad, last_bad + incr);
478 reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
479 }
480 start_bad = last_bad = start_phys_aligned;
481 }
482 }
483 }
484 if (start_bad) {
485 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved",
486 val, start_bad, last_bad + incr);
487 reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
488 }
489
490 }
491
492 static int memtest_pattern __initdata = CONFIG_MEMTEST_BOOTPARAM_VALUE;
493
494 static int __init parse_memtest(char *arg)
495 {
496 if (arg)
497 memtest_pattern = simple_strtoul(arg, NULL, 0);
498 return 0;
499 }
500
501 early_param("memtest", parse_memtest);
502
503 static void __init early_memtest(unsigned long start, unsigned long end)
504 {
505 unsigned long t_start, t_size;
506 unsigned pattern;
507
508 if (!memtest_pattern)
509 return;
510
511 printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
512 for (pattern = 0; pattern < memtest_pattern; pattern++) {
513 t_start = start;
514 t_size = 0;
515 while (t_start < end) {
516 t_start = find_e820_area_size(t_start, &t_size, 1);
517
518 /* done ? */
519 if (t_start >= end)
520 break;
521 if (t_start + t_size > end)
522 t_size = end - t_start;
523
524 printk(KERN_CONT "\n %016lx - %016lx pattern %d",
525 t_start, t_start + t_size, pattern);
526
527 memtest(t_start, t_size, pattern);
528
529 t_start += t_size;
530 }
531 }
532 printk(KERN_CONT "\n");
533 }
534 #else
535 static void __init early_memtest(unsigned long start, unsigned long end)
536 {
537 }
538 #endif
539
540 /*
541 * Setup the direct mapping of the physical memory at PAGE_OFFSET.
542 * This runs before bootmem is initialized and gets pages directly from
543 * the physical memory. To access them they are temporarily mapped.
544 */
545 void __init_refok init_memory_mapping(unsigned long start, unsigned long end)
546 {
547 unsigned long next;
548 unsigned long start_phys = start, end_phys = end;
549
550 printk(KERN_INFO "init_memory_mapping\n");
551
552 /*
553 * Find space for the kernel direct mapping tables.
554 *
555 * Later we should allocate these tables in the local node of the
556 * memory mapped. Unfortunately this is done currently before the
557 * nodes are discovered.
558 */
559 if (!after_bootmem) {
560 init_gbpages();
561 find_early_table_space(end);
562 }
563
564 start = (unsigned long)__va(start);
565 end = (unsigned long)__va(end);
566
567 for (; start < end; start = next) {
568 pgd_t *pgd = pgd_offset_k(start);
569 unsigned long pud_phys;
570 pud_t *pud;
571
572 if (after_bootmem)
573 pud = pud_offset(pgd, start & PGDIR_MASK);
574 else
575 pud = alloc_low_page(&pud_phys);
576
577 next = start + PGDIR_SIZE;
578 if (next > end)
579 next = end;
580 phys_pud_init(pud, __pa(start), __pa(next));
581 if (!after_bootmem)
582 set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
583 unmap_low_page(pud);
584 }
585
586 if (!after_bootmem)
587 mmu_cr4_features = read_cr4();
588 __flush_tlb_all();
589
590 if (!after_bootmem)
591 reserve_early(table_start << PAGE_SHIFT,
592 table_end << PAGE_SHIFT, "PGTABLE");
593
594 if (!after_bootmem)
595 early_memtest(start_phys, end_phys);
596 }
597
598 #ifndef CONFIG_NUMA
599 void __init paging_init(void)
600 {
601 unsigned long max_zone_pfns[MAX_NR_ZONES];
602
603 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
604 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
605 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
606 max_zone_pfns[ZONE_NORMAL] = end_pfn;
607
608 memory_present(0, 0, end_pfn);
609 sparse_init();
610 free_area_init_nodes(max_zone_pfns);
611 }
612 #endif
613
614 /*
615 * Memory hotplug specific functions
616 */
617 void online_page(struct page *page)
618 {
619 ClearPageReserved(page);
620 init_page_count(page);
621 __free_page(page);
622 totalram_pages++;
623 num_physpages++;
624 }
625
626 #ifdef CONFIG_MEMORY_HOTPLUG
627 /*
628 * Memory is added always to NORMAL zone. This means you will never get
629 * additional DMA/DMA32 memory.
630 */
631 int arch_add_memory(int nid, u64 start, u64 size)
632 {
633 struct pglist_data *pgdat = NODE_DATA(nid);
634 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
635 unsigned long start_pfn = start >> PAGE_SHIFT;
636 unsigned long nr_pages = size >> PAGE_SHIFT;
637 int ret;
638
639 init_memory_mapping(start, start + size-1);
640
641 ret = __add_pages(zone, start_pfn, nr_pages);
642 WARN_ON(1);
643
644 return ret;
645 }
646 EXPORT_SYMBOL_GPL(arch_add_memory);
647
648 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
649 int memory_add_physaddr_to_nid(u64 start)
650 {
651 return 0;
652 }
653 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
654 #endif
655
656 #endif /* CONFIG_MEMORY_HOTPLUG */
657
658 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
659 kcore_modules, kcore_vsyscall;
660
661 void __init mem_init(void)
662 {
663 long codesize, reservedpages, datasize, initsize;
664
665 pci_iommu_alloc();
666
667 /* clear_bss() already clear the empty_zero_page */
668
669 reservedpages = 0;
670
671 /* this will put all low memory onto the freelists */
672 #ifdef CONFIG_NUMA
673 totalram_pages = numa_free_all_bootmem();
674 #else
675 totalram_pages = free_all_bootmem();
676 #endif
677 reservedpages = end_pfn - totalram_pages -
678 absent_pages_in_range(0, end_pfn);
679 after_bootmem = 1;
680
681 codesize = (unsigned long) &_etext - (unsigned long) &_text;
682 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
683 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
684
685 /* Register memory areas for /proc/kcore */
686 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
687 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
688 VMALLOC_END-VMALLOC_START);
689 kclist_add(&kcore_kernel, &_stext, _end - _stext);
690 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
691 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
692 VSYSCALL_END - VSYSCALL_START);
693
694 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
695 "%ldk reserved, %ldk data, %ldk init)\n",
696 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
697 end_pfn << (PAGE_SHIFT-10),
698 codesize >> 10,
699 reservedpages << (PAGE_SHIFT-10),
700 datasize >> 10,
701 initsize >> 10);
702
703 cpa_init();
704 }
705
706 void free_init_pages(char *what, unsigned long begin, unsigned long end)
707 {
708 unsigned long addr = begin;
709
710 if (addr >= end)
711 return;
712
713 /*
714 * If debugging page accesses then do not free this memory but
715 * mark them not present - any buggy init-section access will
716 * create a kernel page fault:
717 */
718 #ifdef CONFIG_DEBUG_PAGEALLOC
719 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
720 begin, PAGE_ALIGN(end));
721 set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
722 #else
723 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
724
725 for (; addr < end; addr += PAGE_SIZE) {
726 ClearPageReserved(virt_to_page(addr));
727 init_page_count(virt_to_page(addr));
728 memset((void *)(addr & ~(PAGE_SIZE-1)),
729 POISON_FREE_INITMEM, PAGE_SIZE);
730 free_page(addr);
731 totalram_pages++;
732 }
733 #endif
734 }
735
736 void free_initmem(void)
737 {
738 free_init_pages("unused kernel memory",
739 (unsigned long)(&__init_begin),
740 (unsigned long)(&__init_end));
741 }
742
743 #ifdef CONFIG_DEBUG_RODATA
744 const int rodata_test_data = 0xC3;
745 EXPORT_SYMBOL_GPL(rodata_test_data);
746
747 void mark_rodata_ro(void)
748 {
749 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
750
751 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
752 (end - start) >> 10);
753 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
754
755 /*
756 * The rodata section (but not the kernel text!) should also be
757 * not-executable.
758 */
759 start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
760 set_memory_nx(start, (end - start) >> PAGE_SHIFT);
761
762 rodata_test();
763
764 #ifdef CONFIG_CPA_DEBUG
765 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
766 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
767
768 printk(KERN_INFO "Testing CPA: again\n");
769 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
770 #endif
771 }
772
773 #endif
774
775 #ifdef CONFIG_BLK_DEV_INITRD
776 void free_initrd_mem(unsigned long start, unsigned long end)
777 {
778 free_init_pages("initrd memory", start, end);
779 }
780 #endif
781
782 void __init reserve_bootmem_generic(unsigned long phys, unsigned len)
783 {
784 #ifdef CONFIG_NUMA
785 int nid = phys_to_nid(phys);
786 #endif
787 unsigned long pfn = phys >> PAGE_SHIFT;
788
789 if (pfn >= end_pfn) {
790 /*
791 * This can happen with kdump kernels when accessing
792 * firmware tables:
793 */
794 if (pfn < max_pfn_mapped)
795 return;
796
797 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",
798 phys, len);
799 return;
800 }
801
802 /* Should check here against the e820 map to avoid double free */
803 #ifdef CONFIG_NUMA
804 reserve_bootmem_node(NODE_DATA(nid), phys, len, BOOTMEM_DEFAULT);
805 #else
806 reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
807 #endif
808 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
809 dma_reserve += len / PAGE_SIZE;
810 set_dma_reserve(dma_reserve);
811 }
812 }
813
814 int kern_addr_valid(unsigned long addr)
815 {
816 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
817 pgd_t *pgd;
818 pud_t *pud;
819 pmd_t *pmd;
820 pte_t *pte;
821
822 if (above != 0 && above != -1UL)
823 return 0;
824
825 pgd = pgd_offset_k(addr);
826 if (pgd_none(*pgd))
827 return 0;
828
829 pud = pud_offset(pgd, addr);
830 if (pud_none(*pud))
831 return 0;
832
833 pmd = pmd_offset(pud, addr);
834 if (pmd_none(*pmd))
835 return 0;
836
837 if (pmd_large(*pmd))
838 return pfn_valid(pmd_pfn(*pmd));
839
840 pte = pte_offset_kernel(pmd, addr);
841 if (pte_none(*pte))
842 return 0;
843
844 return pfn_valid(pte_pfn(*pte));
845 }
846
847 /*
848 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
849 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
850 * not need special handling anymore:
851 */
852 static struct vm_area_struct gate_vma = {
853 .vm_start = VSYSCALL_START,
854 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
855 .vm_page_prot = PAGE_READONLY_EXEC,
856 .vm_flags = VM_READ | VM_EXEC
857 };
858
859 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
860 {
861 #ifdef CONFIG_IA32_EMULATION
862 if (test_tsk_thread_flag(tsk, TIF_IA32))
863 return NULL;
864 #endif
865 return &gate_vma;
866 }
867
868 int in_gate_area(struct task_struct *task, unsigned long addr)
869 {
870 struct vm_area_struct *vma = get_gate_vma(task);
871
872 if (!vma)
873 return 0;
874
875 return (addr >= vma->vm_start) && (addr < vma->vm_end);
876 }
877
878 /*
879 * Use this when you have no reliable task/vma, typically from interrupt
880 * context. It is less reliable than using the task's vma and may give
881 * false positives:
882 */
883 int in_gate_area_no_task(unsigned long addr)
884 {
885 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
886 }
887
888 const char *arch_vma_name(struct vm_area_struct *vma)
889 {
890 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
891 return "[vdso]";
892 if (vma == &gate_vma)
893 return "[vsyscall]";
894 return NULL;
895 }
896
897 #ifdef CONFIG_SPARSEMEM_VMEMMAP
898 /*
899 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
900 */
901 int __meminit
902 vmemmap_populate(struct page *start_page, unsigned long size, int node)
903 {
904 unsigned long addr = (unsigned long)start_page;
905 unsigned long end = (unsigned long)(start_page + size);
906 unsigned long next;
907 pgd_t *pgd;
908 pud_t *pud;
909 pmd_t *pmd;
910
911 for (; addr < end; addr = next) {
912 next = pmd_addr_end(addr, end);
913
914 pgd = vmemmap_pgd_populate(addr, node);
915 if (!pgd)
916 return -ENOMEM;
917
918 pud = vmemmap_pud_populate(pgd, addr, node);
919 if (!pud)
920 return -ENOMEM;
921
922 pmd = pmd_offset(pud, addr);
923 if (pmd_none(*pmd)) {
924 pte_t entry;
925 void *p;
926
927 p = vmemmap_alloc_block(PMD_SIZE, node);
928 if (!p)
929 return -ENOMEM;
930
931 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
932 PAGE_KERNEL_LARGE);
933 set_pmd(pmd, __pmd(pte_val(entry)));
934
935 printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n",
936 addr, addr + PMD_SIZE - 1, p, node);
937 } else {
938 vmemmap_verify((pte_t *)pmd, node, addr, next);
939 }
940 }
941 return 0;
942 }
943 #endif
x86 "subsystem" repository