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Export kmap_atomic_pfn for DRM-GEM.
[linux-2.6/linux-2.6-openrd.git] / arch / x86 / mm / init_64.c
blobb8e461d4941208fab60f977471dbe088ce48d23e
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
52 /*
53 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
54 * The direct mapping extends to max_pfn_mapped, so that we can directly access
55 * apertures, ACPI and other tables without having to play with fixmaps.
56 */
57 unsigned long max_low_pfn_mapped;
58 unsigned long max_pfn_mapped;
59
60 static unsigned long dma_reserve __initdata;
61
62 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
63
64 int direct_gbpages
65 #ifdef CONFIG_DIRECT_GBPAGES
66 = 1
67 #endif
68 ;
69
70 static int __init parse_direct_gbpages_off(char *arg)
71 {
72 direct_gbpages = 0;
73 return 0;
74 }
75 early_param("nogbpages", parse_direct_gbpages_off);
76
77 static int __init parse_direct_gbpages_on(char *arg)
78 {
79 direct_gbpages = 1;
80 return 0;
81 }
82 early_param("gbpages", parse_direct_gbpages_on);
83
84 /*
85 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
86 * physical space so we can cache the place of the first one and move
87 * around without checking the pgd every time.
88 */
89
90 int after_bootmem;
91
92 pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
93 EXPORT_SYMBOL_GPL(__supported_pte_mask);
94
95 static int do_not_nx __cpuinitdata;
96
97 /*
98 * noexec=on|off
99 * Control non-executable mappings for 64-bit processes.
100 *
101 * on Enable (default)
102 * off Disable
103 */
104 static int __init nonx_setup(char *str)
105 {
106 if (!str)
107 return -EINVAL;
108 if (!strncmp(str, "on", 2)) {
109 __supported_pte_mask |= _PAGE_NX;
110 do_not_nx = 0;
111 } else if (!strncmp(str, "off", 3)) {
112 do_not_nx = 1;
113 __supported_pte_mask &= ~_PAGE_NX;
114 }
115 return 0;
116 }
117 early_param("noexec", nonx_setup);
118
119 void __cpuinit check_efer(void)
120 {
121 unsigned long efer;
122
123 rdmsrl(MSR_EFER, efer);
124 if (!(efer & EFER_NX) || do_not_nx)
125 __supported_pte_mask &= ~_PAGE_NX;
126 }
127
128 int force_personality32;
129
130 /*
131 * noexec32=on|off
132 * Control non executable heap for 32bit processes.
133 * To control the stack too use noexec=off
134 *
135 * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
136 * off PROT_READ implies PROT_EXEC
137 */
138 static int __init nonx32_setup(char *str)
139 {
140 if (!strcmp(str, "on"))
141 force_personality32 &= ~READ_IMPLIES_EXEC;
142 else if (!strcmp(str, "off"))
143 force_personality32 |= READ_IMPLIES_EXEC;
144 return 1;
145 }
146 __setup("noexec32=", nonx32_setup);
147
148 /*
149 * NOTE: This function is marked __ref because it calls __init function
150 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
151 */
152 static __ref void *spp_getpage(void)
153 {
154 void *ptr;
155
156 if (after_bootmem)
157 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
158 else
159 ptr = alloc_bootmem_pages(PAGE_SIZE);
160
161 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
162 panic("set_pte_phys: cannot allocate page data %s\n",
163 after_bootmem ? "after bootmem" : "");
164 }
165
166 pr_debug("spp_getpage %p\n", ptr);
167
168 return ptr;
169 }
170
171 void
172 set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
173 {
174 pud_t *pud;
175 pmd_t *pmd;
176 pte_t *pte;
177
178 pud = pud_page + pud_index(vaddr);
179 if (pud_none(*pud)) {
180 pmd = (pmd_t *) spp_getpage();
181 pud_populate(&init_mm, pud, pmd);
182 if (pmd != pmd_offset(pud, 0)) {
183 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
184 pmd, pmd_offset(pud, 0));
185 return;
186 }
187 }
188 pmd = pmd_offset(pud, vaddr);
189 if (pmd_none(*pmd)) {
190 pte = (pte_t *) spp_getpage();
191 pmd_populate_kernel(&init_mm, pmd, pte);
192 if (pte != pte_offset_kernel(pmd, 0)) {
193 printk(KERN_ERR "PAGETABLE BUG #02!\n");
194 return;
195 }
196 }
197
198 pte = pte_offset_kernel(pmd, vaddr);
199 set_pte(pte, new_pte);
200
201 /*
202 * It's enough to flush this one mapping.
203 * (PGE mappings get flushed as well)
204 */
205 __flush_tlb_one(vaddr);
206 }
207
208 void
209 set_pte_vaddr(unsigned long vaddr, pte_t pteval)
210 {
211 pgd_t *pgd;
212 pud_t *pud_page;
213
214 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
215
216 pgd = pgd_offset_k(vaddr);
217 if (pgd_none(*pgd)) {
218 printk(KERN_ERR
219 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
220 return;
221 }
222 pud_page = (pud_t*)pgd_page_vaddr(*pgd);
223 set_pte_vaddr_pud(pud_page, vaddr, pteval);
224 }
225
226 /*
227 * Create large page table mappings for a range of physical addresses.
228 */
229 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
230 pgprot_t prot)
231 {
232 pgd_t *pgd;
233 pud_t *pud;
234 pmd_t *pmd;
235
236 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
237 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
238 pgd = pgd_offset_k((unsigned long)__va(phys));
239 if (pgd_none(*pgd)) {
240 pud = (pud_t *) spp_getpage();
241 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
242 _PAGE_USER));
243 }
244 pud = pud_offset(pgd, (unsigned long)__va(phys));
245 if (pud_none(*pud)) {
246 pmd = (pmd_t *) spp_getpage();
247 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
248 _PAGE_USER));
249 }
250 pmd = pmd_offset(pud, phys);
251 BUG_ON(!pmd_none(*pmd));
252 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
253 }
254 }
255
256 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
257 {
258 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE);
259 }
260
261 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
262 {
263 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
264 }
265
266 /*
267 * The head.S code sets up the kernel high mapping:
268 *
269 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
270 *
271 * phys_addr holds the negative offset to the kernel, which is added
272 * to the compile time generated pmds. This results in invalid pmds up
273 * to the point where we hit the physaddr 0 mapping.
274 *
275 * We limit the mappings to the region from _text to _end. _end is
276 * rounded up to the 2MB boundary. This catches the invalid pmds as
277 * well, as they are located before _text:
278 */
279 void __init cleanup_highmap(void)
280 {
281 unsigned long vaddr = __START_KERNEL_map;
282 unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
283 pmd_t *pmd = level2_kernel_pgt;
284 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
285
286 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
287 if (pmd_none(*pmd))
288 continue;
289 if (vaddr < (unsigned long) _text || vaddr > end)
290 set_pmd(pmd, __pmd(0));
291 }
292 }
293
294 static unsigned long __initdata table_start;
295 static unsigned long __meminitdata table_end;
296 static unsigned long __meminitdata table_top;
297
298 static __ref void *alloc_low_page(unsigned long *phys)
299 {
300 unsigned long pfn = table_end++;
301 void *adr;
302
303 if (after_bootmem) {
304 adr = (void *)get_zeroed_page(GFP_ATOMIC);
305 *phys = __pa(adr);
306
307 return adr;
308 }
309
310 if (pfn >= table_top)
311 panic("alloc_low_page: ran out of memory");
312
313 adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
314 memset(adr, 0, PAGE_SIZE);
315 *phys = pfn * PAGE_SIZE;
316 return adr;
317 }
318
319 static __ref void unmap_low_page(void *adr)
320 {
321 if (after_bootmem)
322 return;
323
324 early_iounmap(adr, PAGE_SIZE);
325 }
326
327 static unsigned long __meminit
328 phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
329 pgprot_t prot)
330 {
331 unsigned pages = 0;
332 unsigned long last_map_addr = end;
333 int i;
334
335 pte_t *pte = pte_page + pte_index(addr);
336
337 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) {
338
339 if (addr >= end) {
340 if (!after_bootmem) {
341 for(; i < PTRS_PER_PTE; i++, pte++)
342 set_pte(pte, __pte(0));
343 }
344 break;
345 }
346
347 /*
348 * We will re-use the existing mapping.
349 * Xen for example has some special requirements, like mapping
350 * pagetable pages as RO. So assume someone who pre-setup
351 * these mappings are more intelligent.
352 */
353 if (pte_val(*pte))
354 continue;
355
356 if (0)
357 printk(" pte=%p addr=%lx pte=%016lx\n",
358 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
359 pages++;
360 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
361 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
362 }
363
364 update_page_count(PG_LEVEL_4K, pages);
365
366 return last_map_addr;
367 }
368
369 static unsigned long __meminit
370 phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end,
371 pgprot_t prot)
372 {
373 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd);
374
375 return phys_pte_init(pte, address, end, prot);
376 }
377
378 static unsigned long __meminit
379 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
380 unsigned long page_size_mask, pgprot_t prot)
381 {
382 unsigned long pages = 0;
383 unsigned long last_map_addr = end;
384
385 int i = pmd_index(address);
386
387 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
388 unsigned long pte_phys;
389 pmd_t *pmd = pmd_page + pmd_index(address);
390 pte_t *pte;
391 pgprot_t new_prot = prot;
392
393 if (address >= end) {
394 if (!after_bootmem) {
395 for (; i < PTRS_PER_PMD; i++, pmd++)
396 set_pmd(pmd, __pmd(0));
397 }
398 break;
399 }
400
401 if (pmd_val(*pmd)) {
402 if (!pmd_large(*pmd)) {
403 spin_lock(&init_mm.page_table_lock);
404 last_map_addr = phys_pte_update(pmd, address,
405 end, prot);
406 spin_unlock(&init_mm.page_table_lock);
407 continue;
408 }
409 /*
410 * If we are ok with PG_LEVEL_2M mapping, then we will
411 * use the existing mapping,
412 *
413 * Otherwise, we will split the large page mapping but
414 * use the same existing protection bits except for
415 * large page, so that we don't violate Intel's TLB
416 * Application note (317080) which says, while changing
417 * the page sizes, new and old translations should
418 * not differ with respect to page frame and
419 * attributes.
420 */
421 if (page_size_mask & (1 << PG_LEVEL_2M))
422 continue;
423 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
424 }
425
426 if (page_size_mask & (1<<PG_LEVEL_2M)) {
427 pages++;
428 spin_lock(&init_mm.page_table_lock);
429 set_pte((pte_t *)pmd,
430 pfn_pte(address >> PAGE_SHIFT,
431 __pgprot(pgprot_val(prot) | _PAGE_PSE)));
432 spin_unlock(&init_mm.page_table_lock);
433 last_map_addr = (address & PMD_MASK) + PMD_SIZE;
434 continue;
435 }
436
437 pte = alloc_low_page(&pte_phys);
438 last_map_addr = phys_pte_init(pte, address, end, new_prot);
439 unmap_low_page(pte);
440
441 spin_lock(&init_mm.page_table_lock);
442 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));
443 spin_unlock(&init_mm.page_table_lock);
444 }
445 update_page_count(PG_LEVEL_2M, pages);
446 return last_map_addr;
447 }
448
449 static unsigned long __meminit
450 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end,
451 unsigned long page_size_mask, pgprot_t prot)
452 {
453 pmd_t *pmd = pmd_offset(pud, 0);
454 unsigned long last_map_addr;
455
456 last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot);
457 __flush_tlb_all();
458 return last_map_addr;
459 }
460
461 static unsigned long __meminit
462 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
463 unsigned long page_size_mask)
464 {
465 unsigned long pages = 0;
466 unsigned long last_map_addr = end;
467 int i = pud_index(addr);
468
469 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
470 unsigned long pmd_phys;
471 pud_t *pud = pud_page + pud_index(addr);
472 pmd_t *pmd;
473 pgprot_t prot = PAGE_KERNEL;
474
475 if (addr >= end)
476 break;
477
478 if (!after_bootmem &&
479 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
480 set_pud(pud, __pud(0));
481 continue;
482 }
483
484 if (pud_val(*pud)) {
485 if (!pud_large(*pud)) {
486 last_map_addr = phys_pmd_update(pud, addr, end,
487 page_size_mask, prot);
488 continue;
489 }
490 /*
491 * If we are ok with PG_LEVEL_1G mapping, then we will
492 * use the existing mapping.
493 *
494 * Otherwise, we will split the gbpage mapping but use
495 * the same existing protection bits except for large
496 * page, so that we don't violate Intel's TLB
497 * Application note (317080) which says, while changing
498 * the page sizes, new and old translations should
499 * not differ with respect to page frame and
500 * attributes.
501 */
502 if (page_size_mask & (1 << PG_LEVEL_1G))
503 continue;
504 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
505 }
506
507 if (page_size_mask & (1<<PG_LEVEL_1G)) {
508 pages++;
509 spin_lock(&init_mm.page_table_lock);
510 set_pte((pte_t *)pud,
511 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
512 spin_unlock(&init_mm.page_table_lock);
513 last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
514 continue;
515 }
516
517 pmd = alloc_low_page(&pmd_phys);
518 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
519 prot);
520 unmap_low_page(pmd);
521
522 spin_lock(&init_mm.page_table_lock);
523 pud_populate(&init_mm, pud, __va(pmd_phys));
524 spin_unlock(&init_mm.page_table_lock);
525 }
526 __flush_tlb_all();
527
528 update_page_count(PG_LEVEL_1G, pages);
529
530 return last_map_addr;
531 }
532
533 static unsigned long __meminit
534 phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end,
535 unsigned long page_size_mask)
536 {
537 pud_t *pud;
538
539 pud = (pud_t *)pgd_page_vaddr(*pgd);
540
541 return phys_pud_init(pud, addr, end, page_size_mask);
542 }
543
544 static void __init find_early_table_space(unsigned long end, int use_pse,
545 int use_gbpages)
546 {
547 unsigned long puds, pmds, ptes, tables, start;
548
549 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
550 tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
551 if (use_gbpages) {
552 unsigned long extra;
553 extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
554 pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
555 } else
556 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
557 tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
558
559 if (use_pse) {
560 unsigned long extra;
561 extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
562 ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
563 } else
564 ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
565 tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
566
567 /*
568 * RED-PEN putting page tables only on node 0 could
569 * cause a hotspot and fill up ZONE_DMA. The page tables
570 * need roughly 0.5KB per GB.
571 */
572 start = 0x8000;
573 table_start = find_e820_area(start, end, tables, PAGE_SIZE);
574 if (table_start == -1UL)
575 panic("Cannot find space for the kernel page tables");
576
577 table_start >>= PAGE_SHIFT;
578 table_end = table_start;
579 table_top = table_start + (tables >> PAGE_SHIFT);
580
581 printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
582 end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT);
583 }
584
585 static void __init init_gbpages(void)
586 {
587 if (direct_gbpages && cpu_has_gbpages)
588 printk(KERN_INFO "Using GB pages for direct mapping\n");
589 else
590 direct_gbpages = 0;
591 }
592
593 static unsigned long __init kernel_physical_mapping_init(unsigned long start,
594 unsigned long end,
595 unsigned long page_size_mask)
596 {
597
598 unsigned long next, last_map_addr = end;
599
600 start = (unsigned long)__va(start);
601 end = (unsigned long)__va(end);
602
603 for (; start < end; start = next) {
604 pgd_t *pgd = pgd_offset_k(start);
605 unsigned long pud_phys;
606 pud_t *pud;
607
608 next = (start + PGDIR_SIZE) & PGDIR_MASK;
609 if (next > end)
610 next = end;
611
612 if (pgd_val(*pgd)) {
613 last_map_addr = phys_pud_update(pgd, __pa(start),
614 __pa(end), page_size_mask);
615 continue;
616 }
617
618 pud = alloc_low_page(&pud_phys);
619 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
620 page_size_mask);
621 unmap_low_page(pud);
622
623 spin_lock(&init_mm.page_table_lock);
624 pgd_populate(&init_mm, pgd, __va(pud_phys));
625 spin_unlock(&init_mm.page_table_lock);
626 }
627 __flush_tlb_all();
628
629 return last_map_addr;
630 }
631
632 struct map_range {
633 unsigned long start;
634 unsigned long end;
635 unsigned page_size_mask;
636 };
637
638 #define NR_RANGE_MR 5
639
640 static int save_mr(struct map_range *mr, int nr_range,
641 unsigned long start_pfn, unsigned long end_pfn,
642 unsigned long page_size_mask)
643 {
644
645 if (start_pfn < end_pfn) {
646 if (nr_range >= NR_RANGE_MR)
647 panic("run out of range for init_memory_mapping\n");
648 mr[nr_range].start = start_pfn<<PAGE_SHIFT;
649 mr[nr_range].end = end_pfn<<PAGE_SHIFT;
650 mr[nr_range].page_size_mask = page_size_mask;
651 nr_range++;
652 }
653
654 return nr_range;
655 }
656
657 /*
658 * Setup the direct mapping of the physical memory at PAGE_OFFSET.
659 * This runs before bootmem is initialized and gets pages directly from
660 * the physical memory. To access them they are temporarily mapped.
661 */
662 unsigned long __init_refok init_memory_mapping(unsigned long start,
663 unsigned long end)
664 {
665 unsigned long last_map_addr = 0;
666 unsigned long page_size_mask = 0;
667 unsigned long start_pfn, end_pfn;
668
669 struct map_range mr[NR_RANGE_MR];
670 int nr_range, i;
671 int use_pse, use_gbpages;
672
673 printk(KERN_INFO "init_memory_mapping\n");
674
675 /*
676 * Find space for the kernel direct mapping tables.
677 *
678 * Later we should allocate these tables in the local node of the
679 * memory mapped. Unfortunately this is done currently before the
680 * nodes are discovered.
681 */
682 if (!after_bootmem)
683 init_gbpages();
684
685 #ifdef CONFIG_DEBUG_PAGEALLOC
686 /*
687 * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
688 * This will simplify cpa(), which otherwise needs to support splitting
689 * large pages into small in interrupt context, etc.
690 */
691 use_pse = use_gbpages = 0;
692 #else
693 use_pse = cpu_has_pse;
694 use_gbpages = direct_gbpages;
695 #endif
696
697 if (use_gbpages)
698 page_size_mask |= 1 << PG_LEVEL_1G;
699 if (use_pse)
700 page_size_mask |= 1 << PG_LEVEL_2M;
701
702 memset(mr, 0, sizeof(mr));
703 nr_range = 0;
704
705 /* head if not big page alignment ?*/
706 start_pfn = start >> PAGE_SHIFT;
707 end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT)
708 << (PMD_SHIFT - PAGE_SHIFT);
709 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
710
711 /* big page (2M) range*/
712 start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
713 << (PMD_SHIFT - PAGE_SHIFT);
714 end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT)
715 << (PUD_SHIFT - PAGE_SHIFT);
716 if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)))
717 end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT));
718 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
719 page_size_mask & (1<<PG_LEVEL_2M));
720
721 /* big page (1G) range */
722 start_pfn = end_pfn;
723 end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
724 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
725 page_size_mask &
726 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
727
728 /* tail is not big page (1G) alignment */
729 start_pfn = end_pfn;
730 end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
731 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
732 page_size_mask & (1<<PG_LEVEL_2M));
733
734 /* tail is not big page (2M) alignment */
735 start_pfn = end_pfn;
736 end_pfn = end>>PAGE_SHIFT;
737 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
738
739 /* try to merge same page size and continuous */
740 for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
741 unsigned long old_start;
742 if (mr[i].end != mr[i+1].start ||
743 mr[i].page_size_mask != mr[i+1].page_size_mask)
744 continue;
745 /* move it */
746 old_start = mr[i].start;
747 memmove(&mr[i], &mr[i+1],
748 (nr_range - 1 - i) * sizeof (struct map_range));
749 mr[i--].start = old_start;
750 nr_range--;
751 }
752
753 for (i = 0; i < nr_range; i++)
754 printk(KERN_DEBUG " %010lx - %010lx page %s\n",
755 mr[i].start, mr[i].end,
756 (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
757 (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
758
759 if (!after_bootmem)
760 find_early_table_space(end, use_pse, use_gbpages);
761
762 for (i = 0; i < nr_range; i++)
763 last_map_addr = kernel_physical_mapping_init(
764 mr[i].start, mr[i].end,
765 mr[i].page_size_mask);
766
767 if (!after_bootmem)
768 mmu_cr4_features = read_cr4();
769 __flush_tlb_all();
770
771 if (!after_bootmem && table_end > table_start)
772 reserve_early(table_start << PAGE_SHIFT,
773 table_end << PAGE_SHIFT, "PGTABLE");
774
775 printk(KERN_INFO "last_map_addr: %lx end: %lx\n",
776 last_map_addr, end);
777
778 if (!after_bootmem)
779 early_memtest(start, end);
780
781 return last_map_addr >> PAGE_SHIFT;
782 }
783
784 #ifndef CONFIG_NUMA
785 void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
786 {
787 unsigned long bootmap_size, bootmap;
788
789 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
790 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
791 PAGE_SIZE);
792 if (bootmap == -1L)
793 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
794 /* don't touch min_low_pfn */
795 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
796 0, end_pfn);
797 e820_register_active_regions(0, start_pfn, end_pfn);
798 free_bootmem_with_active_regions(0, end_pfn);
799 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
800 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
801 }
802
803 void __init paging_init(void)
804 {
805 unsigned long max_zone_pfns[MAX_NR_ZONES];
806
807 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
808 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
809 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
810 max_zone_pfns[ZONE_NORMAL] = max_pfn;
811
812 memory_present(0, 0, max_pfn);
813 sparse_init();
814 free_area_init_nodes(max_zone_pfns);
815 }
816 #endif
817
818 /*
819 * Memory hotplug specific functions
820 */
821 #ifdef CONFIG_MEMORY_HOTPLUG
822 /*
823 * Memory is added always to NORMAL zone. This means you will never get
824 * additional DMA/DMA32 memory.
825 */
826 int arch_add_memory(int nid, u64 start, u64 size)
827 {
828 struct pglist_data *pgdat = NODE_DATA(nid);
829 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
830 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
831 unsigned long nr_pages = size >> PAGE_SHIFT;
832 int ret;
833
834 last_mapped_pfn = init_memory_mapping(start, start + size-1);
835 if (last_mapped_pfn > max_pfn_mapped)
836 max_pfn_mapped = last_mapped_pfn;
837
838 ret = __add_pages(zone, start_pfn, nr_pages);
839 WARN_ON(1);
840
841 return ret;
842 }
843 EXPORT_SYMBOL_GPL(arch_add_memory);
844
845 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
846 int memory_add_physaddr_to_nid(u64 start)
847 {
848 return 0;
849 }
850 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
851 #endif
852
853 #endif /* CONFIG_MEMORY_HOTPLUG */
854
855 /*
856 * devmem_is_allowed() checks to see if /dev/mem access to a certain address
857 * is valid. The argument is a physical page number.
858 *
859 *
860 * On x86, access has to be given to the first megabyte of ram because that area
861 * contains bios code and data regions used by X and dosemu and similar apps.
862 * Access has to be given to non-kernel-ram areas as well, these contain the PCI
863 * mmio resources as well as potential bios/acpi data regions.
864 */
865 int devmem_is_allowed(unsigned long pagenr)
866 {
867 if (pagenr <= 256)
868 return 1;
869 if (!page_is_ram(pagenr))
870 return 1;
871 return 0;
872 }
873
874
875 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
876 kcore_modules, kcore_vsyscall;
877
878 void __init mem_init(void)
879 {
880 long codesize, reservedpages, datasize, initsize;
881
882 start_periodic_check_for_corruption();
883
884 pci_iommu_alloc();
885
886 /* clear_bss() already clear the empty_zero_page */
887
888 reservedpages = 0;
889
890 /* this will put all low memory onto the freelists */
891 #ifdef CONFIG_NUMA
892 totalram_pages = numa_free_all_bootmem();
893 #else
894 totalram_pages = free_all_bootmem();
895 #endif
896 reservedpages = max_pfn - totalram_pages -
897 absent_pages_in_range(0, max_pfn);
898 after_bootmem = 1;
899
900 codesize = (unsigned long) &_etext - (unsigned long) &_text;
901 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
902 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
903
904 /* Register memory areas for /proc/kcore */
905 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
906 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
907 VMALLOC_END-VMALLOC_START);
908 kclist_add(&kcore_kernel, &_stext, _end - _stext);
909 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
910 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
911 VSYSCALL_END - VSYSCALL_START);
912
913 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
914 "%ldk reserved, %ldk data, %ldk init)\n",
915 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
916 max_pfn << (PAGE_SHIFT-10),
917 codesize >> 10,
918 reservedpages << (PAGE_SHIFT-10),
919 datasize >> 10,
920 initsize >> 10);
921 }
922
923 void free_init_pages(char *what, unsigned long begin, unsigned long end)
924 {
925 unsigned long addr = begin;
926
927 if (addr >= end)
928 return;
929
930 /*
931 * If debugging page accesses then do not free this memory but
932 * mark them not present - any buggy init-section access will
933 * create a kernel page fault:
934 */
935 #ifdef CONFIG_DEBUG_PAGEALLOC
936 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
937 begin, PAGE_ALIGN(end));
938 set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
939 #else
940 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
941
942 for (; addr < end; addr += PAGE_SIZE) {
943 ClearPageReserved(virt_to_page(addr));
944 init_page_count(virt_to_page(addr));
945 memset((void *)(addr & ~(PAGE_SIZE-1)),
946 POISON_FREE_INITMEM, PAGE_SIZE);
947 free_page(addr);
948 totalram_pages++;
949 }
950 #endif
951 }
952
953 void free_initmem(void)
954 {
955 free_init_pages("unused kernel memory",
956 (unsigned long)(&__init_begin),
957 (unsigned long)(&__init_end));
958 }
959
960 #ifdef CONFIG_DEBUG_RODATA
961 const int rodata_test_data = 0xC3;
962 EXPORT_SYMBOL_GPL(rodata_test_data);
963
964 void mark_rodata_ro(void)
965 {
966 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
967 unsigned long rodata_start =
968 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
969
970 #ifdef CONFIG_DYNAMIC_FTRACE
971 /* Dynamic tracing modifies the kernel text section */
972 start = rodata_start;
973 #endif
974
975 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
976 (end - start) >> 10);
977 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
978
979 /*
980 * The rodata section (but not the kernel text!) should also be
981 * not-executable.
982 */
983 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT);
984
985 rodata_test();
986
987 #ifdef CONFIG_CPA_DEBUG
988 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
989 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
990
991 printk(KERN_INFO "Testing CPA: again\n");
992 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
993 #endif
994 }
995
996 #endif
997
998 #ifdef CONFIG_BLK_DEV_INITRD
999 void free_initrd_mem(unsigned long start, unsigned long end)
1000 {
1001 free_init_pages("initrd memory", start, end);
1002 }
1003 #endif
1004
1005 int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
1006 int flags)
1007 {
1008 #ifdef CONFIG_NUMA
1009 int nid, next_nid;
1010 int ret;
1011 #endif
1012 unsigned long pfn = phys >> PAGE_SHIFT;
1013
1014 if (pfn >= max_pfn) {
1015 /*
1016 * This can happen with kdump kernels when accessing
1017 * firmware tables:
1018 */
1019 if (pfn < max_pfn_mapped)
1020 return -EFAULT;
1021
1022 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n",
1023 phys, len);
1024 return -EFAULT;
1025 }
1026
1027 /* Should check here against the e820 map to avoid double free */
1028 #ifdef CONFIG_NUMA
1029 nid = phys_to_nid(phys);
1030 next_nid = phys_to_nid(phys + len - 1);
1031 if (nid == next_nid)
1032 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags);
1033 else
1034 ret = reserve_bootmem(phys, len, flags);
1035
1036 if (ret != 0)
1037 return ret;
1038
1039 #else
1040 reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
1041 #endif
1042
1043 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
1044 dma_reserve += len / PAGE_SIZE;
1045 set_dma_reserve(dma_reserve);
1046 }
1047
1048 return 0;
1049 }
1050
1051 int kern_addr_valid(unsigned long addr)
1052 {
1053 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
1054 pgd_t *pgd;
1055 pud_t *pud;
1056 pmd_t *pmd;
1057 pte_t *pte;
1058
1059 if (above != 0 && above != -1UL)
1060 return 0;
1061
1062 pgd = pgd_offset_k(addr);
1063 if (pgd_none(*pgd))
1064 return 0;
1065
1066 pud = pud_offset(pgd, addr);
1067 if (pud_none(*pud))
1068 return 0;
1069
1070 pmd = pmd_offset(pud, addr);
1071 if (pmd_none(*pmd))
1072 return 0;
1073
1074 if (pmd_large(*pmd))
1075 return pfn_valid(pmd_pfn(*pmd));
1076
1077 pte = pte_offset_kernel(pmd, addr);
1078 if (pte_none(*pte))
1079 return 0;
1080
1081 return pfn_valid(pte_pfn(*pte));
1082 }
1083
1084 /*
1085 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
1086 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
1087 * not need special handling anymore:
1088 */
1089 static struct vm_area_struct gate_vma = {
1090 .vm_start = VSYSCALL_START,
1091 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
1092 .vm_page_prot = PAGE_READONLY_EXEC,
1093 .vm_flags = VM_READ | VM_EXEC
1094 };
1095
1096 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
1097 {
1098 #ifdef CONFIG_IA32_EMULATION
1099 if (test_tsk_thread_flag(tsk, TIF_IA32))
1100 return NULL;
1101 #endif
1102 return &gate_vma;
1103 }
1104
1105 int in_gate_area(struct task_struct *task, unsigned long addr)
1106 {
1107 struct vm_area_struct *vma = get_gate_vma(task);
1108
1109 if (!vma)
1110 return 0;
1111
1112 return (addr >= vma->vm_start) && (addr < vma->vm_end);
1113 }
1114
1115 /*
1116 * Use this when you have no reliable task/vma, typically from interrupt
1117 * context. It is less reliable than using the task's vma and may give
1118 * false positives:
1119 */
1120 int in_gate_area_no_task(unsigned long addr)
1121 {
1122 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
1123 }
1124
1125 const char *arch_vma_name(struct vm_area_struct *vma)
1126 {
1127 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
1128 return "[vdso]";
1129 if (vma == &gate_vma)
1130 return "[vsyscall]";
1131 return NULL;
1132 }
1133
1134 #ifdef CONFIG_SPARSEMEM_VMEMMAP
1135 /*
1136 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
1137 */
1138 static long __meminitdata addr_start, addr_end;
1139 static void __meminitdata *p_start, *p_end;
1140 static int __meminitdata node_start;
1141
1142 int __meminit
1143 vmemmap_populate(struct page *start_page, unsigned long size, int node)
1144 {
1145 unsigned long addr = (unsigned long)start_page;
1146 unsigned long end = (unsigned long)(start_page + size);
1147 unsigned long next;
1148 pgd_t *pgd;
1149 pud_t *pud;
1150 pmd_t *pmd;
1151
1152 for (; addr < end; addr = next) {
1153 void *p = NULL;
1154
1155 pgd = vmemmap_pgd_populate(addr, node);
1156 if (!pgd)
1157 return -ENOMEM;
1158
1159 pud = vmemmap_pud_populate(pgd, addr, node);
1160 if (!pud)
1161 return -ENOMEM;
1162
1163 if (!cpu_has_pse) {
1164 next = (addr + PAGE_SIZE) & PAGE_MASK;
1165 pmd = vmemmap_pmd_populate(pud, addr, node);
1166
1167 if (!pmd)
1168 return -ENOMEM;
1169
1170 p = vmemmap_pte_populate(pmd, addr, node);
1171
1172 if (!p)
1173 return -ENOMEM;
1174
1175 addr_end = addr + PAGE_SIZE;
1176 p_end = p + PAGE_SIZE;
1177 } else {
1178 next = pmd_addr_end(addr, end);
1179
1180 pmd = pmd_offset(pud, addr);
1181 if (pmd_none(*pmd)) {
1182 pte_t entry;
1183
1184 p = vmemmap_alloc_block(PMD_SIZE, node);
1185 if (!p)
1186 return -ENOMEM;
1187
1188 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
1189 PAGE_KERNEL_LARGE);
1190 set_pmd(pmd, __pmd(pte_val(entry)));
1191
1192 /* check to see if we have contiguous blocks */
1193 if (p_end != p || node_start != node) {
1194 if (p_start)
1195 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1196 addr_start, addr_end-1, p_start, p_end-1, node_start);
1197 addr_start = addr;
1198 node_start = node;
1199 p_start = p;
1200 }
1201
1202 addr_end = addr + PMD_SIZE;
1203 p_end = p + PMD_SIZE;
1204 } else
1205 vmemmap_verify((pte_t *)pmd, node, addr, next);
1206 }
1207
1208 }
1209 return 0;
1210 }
1211
1212 void __meminit vmemmap_populate_print_last(void)
1213 {
1214 if (p_start) {
1215 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1216 addr_start, addr_end-1, p_start, p_end-1, node_start);
1217 p_start = NULL;
1218 p_end = NULL;
1219 node_start = 0;
1220 }
1221 }
1222 #endif
linux 2.6 git repository for openrd