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OMAP: Add new function to check wether there is irq pending
[linux-ginger.git] / arch / x86 / mm / init_64.c
blob1753e8020df6ec8aa3eefea7342386224e595f2c
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/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
53 /*
54 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
55 * The direct mapping extends to max_pfn_mapped, so that we can directly access
56 * apertures, ACPI and other tables without having to play with fixmaps.
57 */
58 unsigned long max_low_pfn_mapped;
59 unsigned long max_pfn_mapped;
60
61 static unsigned long dma_reserve __initdata;
62
63 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
64
65 static int __init parse_direct_gbpages_off(char *arg)
66 {
67 direct_gbpages = 0;
68 return 0;
69 }
70 early_param("nogbpages", parse_direct_gbpages_off);
71
72 static int __init parse_direct_gbpages_on(char *arg)
73 {
74 direct_gbpages = 1;
75 return 0;
76 }
77 early_param("gbpages", parse_direct_gbpages_on);
78
79 /*
80 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
81 * physical space so we can cache the place of the first one and move
82 * around without checking the pgd every time.
83 */
84
85 pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
86 EXPORT_SYMBOL_GPL(__supported_pte_mask);
87
88 static int disable_nx __cpuinitdata;
89
90 /*
91 * noexec=on|off
92 * Control non-executable mappings for 64-bit processes.
93 *
94 * on Enable (default)
95 * off Disable
96 */
97 static int __init nonx_setup(char *str)
98 {
99 if (!str)
100 return -EINVAL;
101 if (!strncmp(str, "on", 2)) {
102 __supported_pte_mask |= _PAGE_NX;
103 disable_nx = 0;
104 } else if (!strncmp(str, "off", 3)) {
105 disable_nx = 1;
106 __supported_pte_mask &= ~_PAGE_NX;
107 }
108 return 0;
109 }
110 early_param("noexec", nonx_setup);
111
112 void __cpuinit check_efer(void)
113 {
114 unsigned long efer;
115
116 rdmsrl(MSR_EFER, efer);
117 if (!(efer & EFER_NX) || disable_nx)
118 __supported_pte_mask &= ~_PAGE_NX;
119 }
120
121 int force_personality32;
122
123 /*
124 * noexec32=on|off
125 * Control non executable heap for 32bit processes.
126 * To control the stack too use noexec=off
127 *
128 * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
129 * off PROT_READ implies PROT_EXEC
130 */
131 static int __init nonx32_setup(char *str)
132 {
133 if (!strcmp(str, "on"))
134 force_personality32 &= ~READ_IMPLIES_EXEC;
135 else if (!strcmp(str, "off"))
136 force_personality32 |= READ_IMPLIES_EXEC;
137 return 1;
138 }
139 __setup("noexec32=", nonx32_setup);
140
141 /*
142 * NOTE: This function is marked __ref because it calls __init function
143 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
144 */
145 static __ref void *spp_getpage(void)
146 {
147 void *ptr;
148
149 if (after_bootmem)
150 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
151 else
152 ptr = alloc_bootmem_pages(PAGE_SIZE);
153
154 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
155 panic("set_pte_phys: cannot allocate page data %s\n",
156 after_bootmem ? "after bootmem" : "");
157 }
158
159 pr_debug("spp_getpage %p\n", ptr);
160
161 return ptr;
162 }
163
164 static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
165 {
166 if (pgd_none(*pgd)) {
167 pud_t *pud = (pud_t *)spp_getpage();
168 pgd_populate(&init_mm, pgd, pud);
169 if (pud != pud_offset(pgd, 0))
170 printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
171 pud, pud_offset(pgd, 0));
172 }
173 return pud_offset(pgd, vaddr);
174 }
175
176 static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
177 {
178 if (pud_none(*pud)) {
179 pmd_t *pmd = (pmd_t *) spp_getpage();
180 pud_populate(&init_mm, pud, pmd);
181 if (pmd != pmd_offset(pud, 0))
182 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
183 pmd, pmd_offset(pud, 0));
184 }
185 return pmd_offset(pud, vaddr);
186 }
187
188 static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
189 {
190 if (pmd_none(*pmd)) {
191 pte_t *pte = (pte_t *) spp_getpage();
192 pmd_populate_kernel(&init_mm, pmd, pte);
193 if (pte != pte_offset_kernel(pmd, 0))
194 printk(KERN_ERR "PAGETABLE BUG #02!\n");
195 }
196 return pte_offset_kernel(pmd, vaddr);
197 }
198
199 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
200 {
201 pud_t *pud;
202 pmd_t *pmd;
203 pte_t *pte;
204
205 pud = pud_page + pud_index(vaddr);
206 pmd = fill_pmd(pud, vaddr);
207 pte = fill_pte(pmd, vaddr);
208
209 set_pte(pte, new_pte);
210
211 /*
212 * It's enough to flush this one mapping.
213 * (PGE mappings get flushed as well)
214 */
215 __flush_tlb_one(vaddr);
216 }
217
218 void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
219 {
220 pgd_t *pgd;
221 pud_t *pud_page;
222
223 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
224
225 pgd = pgd_offset_k(vaddr);
226 if (pgd_none(*pgd)) {
227 printk(KERN_ERR
228 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
229 return;
230 }
231 pud_page = (pud_t*)pgd_page_vaddr(*pgd);
232 set_pte_vaddr_pud(pud_page, vaddr, pteval);
233 }
234
235 pmd_t * __init populate_extra_pmd(unsigned long vaddr)
236 {
237 pgd_t *pgd;
238 pud_t *pud;
239
240 pgd = pgd_offset_k(vaddr);
241 pud = fill_pud(pgd, vaddr);
242 return fill_pmd(pud, vaddr);
243 }
244
245 pte_t * __init populate_extra_pte(unsigned long vaddr)
246 {
247 pmd_t *pmd;
248
249 pmd = populate_extra_pmd(vaddr);
250 return fill_pte(pmd, vaddr);
251 }
252
253 /*
254 * Create large page table mappings for a range of physical addresses.
255 */
256 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
257 pgprot_t prot)
258 {
259 pgd_t *pgd;
260 pud_t *pud;
261 pmd_t *pmd;
262
263 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
264 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
265 pgd = pgd_offset_k((unsigned long)__va(phys));
266 if (pgd_none(*pgd)) {
267 pud = (pud_t *) spp_getpage();
268 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
269 _PAGE_USER));
270 }
271 pud = pud_offset(pgd, (unsigned long)__va(phys));
272 if (pud_none(*pud)) {
273 pmd = (pmd_t *) spp_getpage();
274 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
275 _PAGE_USER));
276 }
277 pmd = pmd_offset(pud, phys);
278 BUG_ON(!pmd_none(*pmd));
279 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
280 }
281 }
282
283 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
284 {
285 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE);
286 }
287
288 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
289 {
290 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
291 }
292
293 /*
294 * The head.S code sets up the kernel high mapping:
295 *
296 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
297 *
298 * phys_addr holds the negative offset to the kernel, which is added
299 * to the compile time generated pmds. This results in invalid pmds up
300 * to the point where we hit the physaddr 0 mapping.
301 *
302 * We limit the mappings to the region from _text to _end. _end is
303 * rounded up to the 2MB boundary. This catches the invalid pmds as
304 * well, as they are located before _text:
305 */
306 void __init cleanup_highmap(void)
307 {
308 unsigned long vaddr = __START_KERNEL_map;
309 unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
310 pmd_t *pmd = level2_kernel_pgt;
311 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
312
313 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
314 if (pmd_none(*pmd))
315 continue;
316 if (vaddr < (unsigned long) _text || vaddr > end)
317 set_pmd(pmd, __pmd(0));
318 }
319 }
320
321 static __ref void *alloc_low_page(unsigned long *phys)
322 {
323 unsigned long pfn = e820_table_end++;
324 void *adr;
325
326 if (after_bootmem) {
327 adr = (void *)get_zeroed_page(GFP_ATOMIC);
328 *phys = __pa(adr);
329
330 return adr;
331 }
332
333 if (pfn >= e820_table_top)
334 panic("alloc_low_page: ran out of memory");
335
336 adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
337 memset(adr, 0, PAGE_SIZE);
338 *phys = pfn * PAGE_SIZE;
339 return adr;
340 }
341
342 static __ref void unmap_low_page(void *adr)
343 {
344 if (after_bootmem)
345 return;
346
347 early_iounmap(adr, PAGE_SIZE);
348 }
349
350 static unsigned long __meminit
351 phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
352 pgprot_t prot)
353 {
354 unsigned pages = 0;
355 unsigned long last_map_addr = end;
356 int i;
357
358 pte_t *pte = pte_page + pte_index(addr);
359
360 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) {
361
362 if (addr >= end) {
363 if (!after_bootmem) {
364 for(; i < PTRS_PER_PTE; i++, pte++)
365 set_pte(pte, __pte(0));
366 }
367 break;
368 }
369
370 /*
371 * We will re-use the existing mapping.
372 * Xen for example has some special requirements, like mapping
373 * pagetable pages as RO. So assume someone who pre-setup
374 * these mappings are more intelligent.
375 */
376 if (pte_val(*pte)) {
377 pages++;
378 continue;
379 }
380
381 if (0)
382 printk(" pte=%p addr=%lx pte=%016lx\n",
383 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
384 pages++;
385 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
386 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
387 }
388
389 update_page_count(PG_LEVEL_4K, pages);
390
391 return last_map_addr;
392 }
393
394 static unsigned long __meminit
395 phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end,
396 pgprot_t prot)
397 {
398 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd);
399
400 return phys_pte_init(pte, address, end, prot);
401 }
402
403 static unsigned long __meminit
404 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
405 unsigned long page_size_mask, pgprot_t prot)
406 {
407 unsigned long pages = 0;
408 unsigned long last_map_addr = end;
409
410 int i = pmd_index(address);
411
412 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
413 unsigned long pte_phys;
414 pmd_t *pmd = pmd_page + pmd_index(address);
415 pte_t *pte;
416 pgprot_t new_prot = prot;
417
418 if (address >= end) {
419 if (!after_bootmem) {
420 for (; i < PTRS_PER_PMD; i++, pmd++)
421 set_pmd(pmd, __pmd(0));
422 }
423 break;
424 }
425
426 if (pmd_val(*pmd)) {
427 if (!pmd_large(*pmd)) {
428 spin_lock(&init_mm.page_table_lock);
429 last_map_addr = phys_pte_update(pmd, address,
430 end, prot);
431 spin_unlock(&init_mm.page_table_lock);
432 continue;
433 }
434 /*
435 * If we are ok with PG_LEVEL_2M mapping, then we will
436 * use the existing mapping,
437 *
438 * Otherwise, we will split the large page mapping but
439 * use the same existing protection bits except for
440 * large page, so that we don't violate Intel's TLB
441 * Application note (317080) which says, while changing
442 * the page sizes, new and old translations should
443 * not differ with respect to page frame and
444 * attributes.
445 */
446 if (page_size_mask & (1 << PG_LEVEL_2M)) {
447 pages++;
448 continue;
449 }
450 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
451 }
452
453 if (page_size_mask & (1<<PG_LEVEL_2M)) {
454 pages++;
455 spin_lock(&init_mm.page_table_lock);
456 set_pte((pte_t *)pmd,
457 pfn_pte(address >> PAGE_SHIFT,
458 __pgprot(pgprot_val(prot) | _PAGE_PSE)));
459 spin_unlock(&init_mm.page_table_lock);
460 last_map_addr = (address & PMD_MASK) + PMD_SIZE;
461 continue;
462 }
463
464 pte = alloc_low_page(&pte_phys);
465 last_map_addr = phys_pte_init(pte, address, end, new_prot);
466 unmap_low_page(pte);
467
468 spin_lock(&init_mm.page_table_lock);
469 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));
470 spin_unlock(&init_mm.page_table_lock);
471 }
472 update_page_count(PG_LEVEL_2M, pages);
473 return last_map_addr;
474 }
475
476 static unsigned long __meminit
477 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end,
478 unsigned long page_size_mask, pgprot_t prot)
479 {
480 pmd_t *pmd = pmd_offset(pud, 0);
481 unsigned long last_map_addr;
482
483 last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot);
484 __flush_tlb_all();
485 return last_map_addr;
486 }
487
488 static unsigned long __meminit
489 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
490 unsigned long page_size_mask)
491 {
492 unsigned long pages = 0;
493 unsigned long last_map_addr = end;
494 int i = pud_index(addr);
495
496 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
497 unsigned long pmd_phys;
498 pud_t *pud = pud_page + pud_index(addr);
499 pmd_t *pmd;
500 pgprot_t prot = PAGE_KERNEL;
501
502 if (addr >= end)
503 break;
504
505 if (!after_bootmem &&
506 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
507 set_pud(pud, __pud(0));
508 continue;
509 }
510
511 if (pud_val(*pud)) {
512 if (!pud_large(*pud)) {
513 last_map_addr = phys_pmd_update(pud, addr, end,
514 page_size_mask, prot);
515 continue;
516 }
517 /*
518 * If we are ok with PG_LEVEL_1G mapping, then we will
519 * use the existing mapping.
520 *
521 * Otherwise, we will split the gbpage mapping but use
522 * the same existing protection bits except for large
523 * page, so that we don't violate Intel's TLB
524 * Application note (317080) which says, while changing
525 * the page sizes, new and old translations should
526 * not differ with respect to page frame and
527 * attributes.
528 */
529 if (page_size_mask & (1 << PG_LEVEL_1G)) {
530 pages++;
531 continue;
532 }
533 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
534 }
535
536 if (page_size_mask & (1<<PG_LEVEL_1G)) {
537 pages++;
538 spin_lock(&init_mm.page_table_lock);
539 set_pte((pte_t *)pud,
540 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
541 spin_unlock(&init_mm.page_table_lock);
542 last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
543 continue;
544 }
545
546 pmd = alloc_low_page(&pmd_phys);
547 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
548 prot);
549 unmap_low_page(pmd);
550
551 spin_lock(&init_mm.page_table_lock);
552 pud_populate(&init_mm, pud, __va(pmd_phys));
553 spin_unlock(&init_mm.page_table_lock);
554 }
555 __flush_tlb_all();
556
557 update_page_count(PG_LEVEL_1G, pages);
558
559 return last_map_addr;
560 }
561
562 static unsigned long __meminit
563 phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end,
564 unsigned long page_size_mask)
565 {
566 pud_t *pud;
567
568 pud = (pud_t *)pgd_page_vaddr(*pgd);
569
570 return phys_pud_init(pud, addr, end, page_size_mask);
571 }
572
573 unsigned long __init
574 kernel_physical_mapping_init(unsigned long start,
575 unsigned long end,
576 unsigned long page_size_mask)
577 {
578
579 unsigned long next, last_map_addr = end;
580
581 start = (unsigned long)__va(start);
582 end = (unsigned long)__va(end);
583
584 for (; start < end; start = next) {
585 pgd_t *pgd = pgd_offset_k(start);
586 unsigned long pud_phys;
587 pud_t *pud;
588
589 next = (start + PGDIR_SIZE) & PGDIR_MASK;
590 if (next > end)
591 next = end;
592
593 if (pgd_val(*pgd)) {
594 last_map_addr = phys_pud_update(pgd, __pa(start),
595 __pa(end), page_size_mask);
596 continue;
597 }
598
599 pud = alloc_low_page(&pud_phys);
600 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
601 page_size_mask);
602 unmap_low_page(pud);
603
604 spin_lock(&init_mm.page_table_lock);
605 pgd_populate(&init_mm, pgd, __va(pud_phys));
606 spin_unlock(&init_mm.page_table_lock);
607 }
608 __flush_tlb_all();
609
610 return last_map_addr;
611 }
612
613 #ifndef CONFIG_NUMA
614 void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
615 {
616 unsigned long bootmap_size, bootmap;
617
618 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
619 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
620 PAGE_SIZE);
621 if (bootmap == -1L)
622 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
623 /* don't touch min_low_pfn */
624 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
625 0, end_pfn);
626 e820_register_active_regions(0, start_pfn, end_pfn);
627 free_bootmem_with_active_regions(0, end_pfn);
628 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
629 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
630 }
631
632 void __init paging_init(void)
633 {
634 unsigned long max_zone_pfns[MAX_NR_ZONES];
635
636 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
637 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
638 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
639 max_zone_pfns[ZONE_NORMAL] = max_pfn;
640
641 memory_present(0, 0, max_pfn);
642 sparse_init();
643 free_area_init_nodes(max_zone_pfns);
644 }
645 #endif
646
647 /*
648 * Memory hotplug specific functions
649 */
650 #ifdef CONFIG_MEMORY_HOTPLUG
651 /*
652 * Memory is added always to NORMAL zone. This means you will never get
653 * additional DMA/DMA32 memory.
654 */
655 int arch_add_memory(int nid, u64 start, u64 size)
656 {
657 struct pglist_data *pgdat = NODE_DATA(nid);
658 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
659 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
660 unsigned long nr_pages = size >> PAGE_SHIFT;
661 int ret;
662
663 last_mapped_pfn = init_memory_mapping(start, start + size);
664 if (last_mapped_pfn > max_pfn_mapped)
665 max_pfn_mapped = last_mapped_pfn;
666
667 ret = __add_pages(nid, zone, start_pfn, nr_pages);
668 WARN_ON_ONCE(ret);
669
670 return ret;
671 }
672 EXPORT_SYMBOL_GPL(arch_add_memory);
673
674 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
675 int memory_add_physaddr_to_nid(u64 start)
676 {
677 return 0;
678 }
679 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
680 #endif
681
682 #endif /* CONFIG_MEMORY_HOTPLUG */
683
684 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
685 kcore_modules, kcore_vsyscall;
686
687 void __init mem_init(void)
688 {
689 long codesize, reservedpages, datasize, initsize;
690 unsigned long absent_pages;
691
692 pci_iommu_alloc();
693
694 /* clear_bss() already clear the empty_zero_page */
695
696 reservedpages = 0;
697
698 /* this will put all low memory onto the freelists */
699 #ifdef CONFIG_NUMA
700 totalram_pages = numa_free_all_bootmem();
701 #else
702 totalram_pages = free_all_bootmem();
703 #endif
704
705 absent_pages = absent_pages_in_range(0, max_pfn);
706 reservedpages = max_pfn - totalram_pages - absent_pages;
707 after_bootmem = 1;
708
709 codesize = (unsigned long) &_etext - (unsigned long) &_text;
710 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
711 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
712
713 /* Register memory areas for /proc/kcore */
714 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
715 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
716 VMALLOC_END-VMALLOC_START);
717 kclist_add(&kcore_kernel, &_stext, _end - _stext);
718 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
719 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
720 VSYSCALL_END - VSYSCALL_START);
721
722 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
723 "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
724 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
725 max_pfn << (PAGE_SHIFT-10),
726 codesize >> 10,
727 absent_pages << (PAGE_SHIFT-10),
728 reservedpages << (PAGE_SHIFT-10),
729 datasize >> 10,
730 initsize >> 10);
731 }
732
733 #ifdef CONFIG_DEBUG_RODATA
734 const int rodata_test_data = 0xC3;
735 EXPORT_SYMBOL_GPL(rodata_test_data);
736
737 static int kernel_set_to_readonly;
738
739 void set_kernel_text_rw(void)
740 {
741 unsigned long start = PFN_ALIGN(_stext);
742 unsigned long end = PFN_ALIGN(__start_rodata);
743
744 if (!kernel_set_to_readonly)
745 return;
746
747 pr_debug("Set kernel text: %lx - %lx for read write\n",
748 start, end);
749
750 set_memory_rw(start, (end - start) >> PAGE_SHIFT);
751 }
752
753 void set_kernel_text_ro(void)
754 {
755 unsigned long start = PFN_ALIGN(_stext);
756 unsigned long end = PFN_ALIGN(__start_rodata);
757
758 if (!kernel_set_to_readonly)
759 return;
760
761 pr_debug("Set kernel text: %lx - %lx for read only\n",
762 start, end);
763
764 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
765 }
766
767 void mark_rodata_ro(void)
768 {
769 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
770 unsigned long rodata_start =
771 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
772
773 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
774 (end - start) >> 10);
775 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
776
777 kernel_set_to_readonly = 1;
778
779 /*
780 * The rodata section (but not the kernel text!) should also be
781 * not-executable.
782 */
783 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT);
784
785 rodata_test();
786
787 #ifdef CONFIG_CPA_DEBUG
788 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
789 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
790
791 printk(KERN_INFO "Testing CPA: again\n");
792 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
793 #endif
794 }
795
796 #endif
797
798 int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
799 int flags)
800 {
801 #ifdef CONFIG_NUMA
802 int nid, next_nid;
803 int ret;
804 #endif
805 unsigned long pfn = phys >> PAGE_SHIFT;
806
807 if (pfn >= max_pfn) {
808 /*
809 * This can happen with kdump kernels when accessing
810 * firmware tables:
811 */
812 if (pfn < max_pfn_mapped)
813 return -EFAULT;
814
815 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n",
816 phys, len);
817 return -EFAULT;
818 }
819
820 /* Should check here against the e820 map to avoid double free */
821 #ifdef CONFIG_NUMA
822 nid = phys_to_nid(phys);
823 next_nid = phys_to_nid(phys + len - 1);
824 if (nid == next_nid)
825 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags);
826 else
827 ret = reserve_bootmem(phys, len, flags);
828
829 if (ret != 0)
830 return ret;
831
832 #else
833 reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
834 #endif
835
836 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
837 dma_reserve += len / PAGE_SIZE;
838 set_dma_reserve(dma_reserve);
839 }
840
841 return 0;
842 }
843
844 int kern_addr_valid(unsigned long addr)
845 {
846 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
847 pgd_t *pgd;
848 pud_t *pud;
849 pmd_t *pmd;
850 pte_t *pte;
851
852 if (above != 0 && above != -1UL)
853 return 0;
854
855 pgd = pgd_offset_k(addr);
856 if (pgd_none(*pgd))
857 return 0;
858
859 pud = pud_offset(pgd, addr);
860 if (pud_none(*pud))
861 return 0;
862
863 pmd = pmd_offset(pud, addr);
864 if (pmd_none(*pmd))
865 return 0;
866
867 if (pmd_large(*pmd))
868 return pfn_valid(pmd_pfn(*pmd));
869
870 pte = pte_offset_kernel(pmd, addr);
871 if (pte_none(*pte))
872 return 0;
873
874 return pfn_valid(pte_pfn(*pte));
875 }
876
877 /*
878 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
879 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
880 * not need special handling anymore:
881 */
882 static struct vm_area_struct gate_vma = {
883 .vm_start = VSYSCALL_START,
884 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
885 .vm_page_prot = PAGE_READONLY_EXEC,
886 .vm_flags = VM_READ | VM_EXEC
887 };
888
889 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
890 {
891 #ifdef CONFIG_IA32_EMULATION
892 if (test_tsk_thread_flag(tsk, TIF_IA32))
893 return NULL;
894 #endif
895 return &gate_vma;
896 }
897
898 int in_gate_area(struct task_struct *task, unsigned long addr)
899 {
900 struct vm_area_struct *vma = get_gate_vma(task);
901
902 if (!vma)
903 return 0;
904
905 return (addr >= vma->vm_start) && (addr < vma->vm_end);
906 }
907
908 /*
909 * Use this when you have no reliable task/vma, typically from interrupt
910 * context. It is less reliable than using the task's vma and may give
911 * false positives:
912 */
913 int in_gate_area_no_task(unsigned long addr)
914 {
915 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
916 }
917
918 const char *arch_vma_name(struct vm_area_struct *vma)
919 {
920 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
921 return "[vdso]";
922 if (vma == &gate_vma)
923 return "[vsyscall]";
924 return NULL;
925 }
926
927 #ifdef CONFIG_SPARSEMEM_VMEMMAP
928 /*
929 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
930 */
931 static long __meminitdata addr_start, addr_end;
932 static void __meminitdata *p_start, *p_end;
933 static int __meminitdata node_start;
934
935 int __meminit
936 vmemmap_populate(struct page *start_page, unsigned long size, int node)
937 {
938 unsigned long addr = (unsigned long)start_page;
939 unsigned long end = (unsigned long)(start_page + size);
940 unsigned long next;
941 pgd_t *pgd;
942 pud_t *pud;
943 pmd_t *pmd;
944
945 for (; addr < end; addr = next) {
946 void *p = NULL;
947
948 pgd = vmemmap_pgd_populate(addr, node);
949 if (!pgd)
950 return -ENOMEM;
951
952 pud = vmemmap_pud_populate(pgd, addr, node);
953 if (!pud)
954 return -ENOMEM;
955
956 if (!cpu_has_pse) {
957 next = (addr + PAGE_SIZE) & PAGE_MASK;
958 pmd = vmemmap_pmd_populate(pud, addr, node);
959
960 if (!pmd)
961 return -ENOMEM;
962
963 p = vmemmap_pte_populate(pmd, addr, node);
964
965 if (!p)
966 return -ENOMEM;
967
968 addr_end = addr + PAGE_SIZE;
969 p_end = p + PAGE_SIZE;
970 } else {
971 next = pmd_addr_end(addr, end);
972
973 pmd = pmd_offset(pud, addr);
974 if (pmd_none(*pmd)) {
975 pte_t entry;
976
977 p = vmemmap_alloc_block(PMD_SIZE, node);
978 if (!p)
979 return -ENOMEM;
980
981 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
982 PAGE_KERNEL_LARGE);
983 set_pmd(pmd, __pmd(pte_val(entry)));
984
985 /* check to see if we have contiguous blocks */
986 if (p_end != p || node_start != node) {
987 if (p_start)
988 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
989 addr_start, addr_end-1, p_start, p_end-1, node_start);
990 addr_start = addr;
991 node_start = node;
992 p_start = p;
993 }
994
995 addr_end = addr + PMD_SIZE;
996 p_end = p + PMD_SIZE;
997 } else
998 vmemmap_verify((pte_t *)pmd, node, addr, next);
999 }
1000
1001 }
1002 return 0;
1003 }
1004
1005 void __meminit vmemmap_populate_print_last(void)
1006 {
1007 if (p_start) {
1008 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1009 addr_start, addr_end-1, p_start, p_end-1, node_start);
1010 p_start = NULL;
1011 p_end = NULL;
1012 node_start = 0;
1013 }
1014 }
1015 #endif
Linux for Ginger Game Console