Linux 2.6.25.3
[linux/fpc-iii.git] / arch / x86 / mm / init_64.c
bloba02a14f0f324f9a3392810a46d587dfcda23a157
1 /*
2 * linux/arch/x86_64/mm/init.c
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 */
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>
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>
50 const struct dma_mapping_ops *dma_ops;
51 EXPORT_SYMBOL(dma_ops);
53 static unsigned long dma_reserve __initdata;
55 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
58 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
59 * physical space so we can cache the place of the first one and move
60 * around without checking the pgd every time.
63 void show_mem(void)
65 long i, total = 0, reserved = 0;
66 long shared = 0, cached = 0;
67 struct page *page;
68 pg_data_t *pgdat;
70 printk(KERN_INFO "Mem-info:\n");
71 show_free_areas();
72 printk(KERN_INFO "Free swap: %6ldkB\n",
73 nr_swap_pages << (PAGE_SHIFT-10));
75 for_each_online_pgdat(pgdat) {
76 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
78 * This loop can take a while with 256 GB and
79 * 4k pages so defer the NMI watchdog:
81 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
82 touch_nmi_watchdog();
84 if (!pfn_valid(pgdat->node_start_pfn + i))
85 continue;
87 page = pfn_to_page(pgdat->node_start_pfn + i);
88 total++;
89 if (PageReserved(page))
90 reserved++;
91 else if (PageSwapCache(page))
92 cached++;
93 else if (page_count(page))
94 shared += page_count(page) - 1;
97 printk(KERN_INFO "%lu pages of RAM\n", total);
98 printk(KERN_INFO "%lu reserved pages\n", reserved);
99 printk(KERN_INFO "%lu pages shared\n", shared);
100 printk(KERN_INFO "%lu pages swap cached\n", cached);
103 int after_bootmem;
105 static __init void *spp_getpage(void)
107 void *ptr;
109 if (after_bootmem)
110 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
111 else
112 ptr = alloc_bootmem_pages(PAGE_SIZE);
114 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
115 panic("set_pte_phys: cannot allocate page data %s\n",
116 after_bootmem ? "after bootmem" : "");
119 pr_debug("spp_getpage %p\n", ptr);
121 return ptr;
124 static __init void
125 set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot)
127 pgd_t *pgd;
128 pud_t *pud;
129 pmd_t *pmd;
130 pte_t *pte, new_pte;
132 pr_debug("set_pte_phys %lx to %lx\n", vaddr, phys);
134 pgd = pgd_offset_k(vaddr);
135 if (pgd_none(*pgd)) {
136 printk(KERN_ERR
137 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
138 return;
140 pud = pud_offset(pgd, vaddr);
141 if (pud_none(*pud)) {
142 pmd = (pmd_t *) spp_getpage();
143 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
144 if (pmd != pmd_offset(pud, 0)) {
145 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
146 pmd, pmd_offset(pud, 0));
147 return;
150 pmd = pmd_offset(pud, vaddr);
151 if (pmd_none(*pmd)) {
152 pte = (pte_t *) spp_getpage();
153 set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
154 if (pte != pte_offset_kernel(pmd, 0)) {
155 printk(KERN_ERR "PAGETABLE BUG #02!\n");
156 return;
159 new_pte = pfn_pte(phys >> PAGE_SHIFT, prot);
161 pte = pte_offset_kernel(pmd, vaddr);
162 if (!pte_none(*pte) &&
163 pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
164 pte_ERROR(*pte);
165 set_pte(pte, new_pte);
168 * It's enough to flush this one mapping.
169 * (PGE mappings get flushed as well)
171 __flush_tlb_one(vaddr);
175 * The head.S code sets up the kernel high mapping:
177 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
179 * phys_addr holds the negative offset to the kernel, which is added
180 * to the compile time generated pmds. This results in invalid pmds up
181 * to the point where we hit the physaddr 0 mapping.
183 * We limit the mappings to the region from _text to _end. _end is
184 * rounded up to the 2MB boundary. This catches the invalid pmds as
185 * well, as they are located before _text:
187 void __init cleanup_highmap(void)
189 unsigned long vaddr = __START_KERNEL_map;
190 unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1;
191 pmd_t *pmd = level2_kernel_pgt;
192 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
194 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
195 if (!pmd_present(*pmd))
196 continue;
197 if (vaddr < (unsigned long) _text || vaddr > end)
198 set_pmd(pmd, __pmd(0));
202 /* NOTE: this is meant to be run only at boot */
203 void __init
204 __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
206 unsigned long address = __fix_to_virt(idx);
208 if (idx >= __end_of_fixed_addresses) {
209 printk(KERN_ERR "Invalid __set_fixmap\n");
210 return;
212 set_pte_phys(address, phys, prot);
215 static unsigned long __initdata table_start;
216 static unsigned long __meminitdata table_end;
218 static __meminit void *alloc_low_page(unsigned long *phys)
220 unsigned long pfn = table_end++;
221 void *adr;
223 if (after_bootmem) {
224 adr = (void *)get_zeroed_page(GFP_ATOMIC);
225 *phys = __pa(adr);
227 return adr;
230 if (pfn >= end_pfn)
231 panic("alloc_low_page: ran out of memory");
233 adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
234 memset(adr, 0, PAGE_SIZE);
235 *phys = pfn * PAGE_SIZE;
236 return adr;
239 static __meminit void unmap_low_page(void *adr)
241 if (after_bootmem)
242 return;
244 early_iounmap(adr, PAGE_SIZE);
247 /* Must run before zap_low_mappings */
248 __meminit void *early_ioremap(unsigned long addr, unsigned long size)
250 pmd_t *pmd, *last_pmd;
251 unsigned long vaddr;
252 int i, pmds;
254 pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
255 vaddr = __START_KERNEL_map;
256 pmd = level2_kernel_pgt;
257 last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1;
259 for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) {
260 for (i = 0; i < pmds; i++) {
261 if (pmd_present(pmd[i]))
262 goto continue_outer_loop;
264 vaddr += addr & ~PMD_MASK;
265 addr &= PMD_MASK;
267 for (i = 0; i < pmds; i++, addr += PMD_SIZE)
268 set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
269 __flush_tlb_all();
271 return (void *)vaddr;
272 continue_outer_loop:
275 printk(KERN_ERR "early_ioremap(0x%lx, %lu) failed\n", addr, size);
277 return NULL;
281 * To avoid virtual aliases later:
283 __meminit void early_iounmap(void *addr, unsigned long size)
285 unsigned long vaddr;
286 pmd_t *pmd;
287 int i, pmds;
289 vaddr = (unsigned long)addr;
290 pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
291 pmd = level2_kernel_pgt + pmd_index(vaddr);
293 for (i = 0; i < pmds; i++)
294 pmd_clear(pmd + i);
296 __flush_tlb_all();
299 static void __meminit
300 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
302 int i = pmd_index(address);
304 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
305 pmd_t *pmd = pmd_page + pmd_index(address);
307 if (address >= end) {
308 if (!after_bootmem) {
309 for (; i < PTRS_PER_PMD; i++, pmd++)
310 set_pmd(pmd, __pmd(0));
312 break;
315 if (pmd_val(*pmd))
316 continue;
318 set_pte((pte_t *)pmd,
319 pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
323 static void __meminit
324 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
326 pmd_t *pmd = pmd_offset(pud, 0);
327 spin_lock(&init_mm.page_table_lock);
328 phys_pmd_init(pmd, address, end);
329 spin_unlock(&init_mm.page_table_lock);
330 __flush_tlb_all();
333 static void __meminit
334 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
336 int i = pud_index(addr);
338 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
339 unsigned long pmd_phys;
340 pud_t *pud = pud_page + pud_index(addr);
341 pmd_t *pmd;
343 if (addr >= end)
344 break;
346 if (!after_bootmem &&
347 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
348 set_pud(pud, __pud(0));
349 continue;
352 if (pud_val(*pud)) {
353 phys_pmd_update(pud, addr, end);
354 continue;
357 pmd = alloc_low_page(&pmd_phys);
359 spin_lock(&init_mm.page_table_lock);
360 set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
361 phys_pmd_init(pmd, addr, end);
362 spin_unlock(&init_mm.page_table_lock);
364 unmap_low_page(pmd);
366 __flush_tlb_all();
369 static void __init find_early_table_space(unsigned long end)
371 unsigned long puds, pmds, tables, start;
373 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
374 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
375 tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) +
376 round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
379 * RED-PEN putting page tables only on node 0 could
380 * cause a hotspot and fill up ZONE_DMA. The page tables
381 * need roughly 0.5KB per GB.
383 start = 0x8000;
384 table_start = find_e820_area(start, end, tables, PAGE_SIZE);
385 if (table_start == -1UL)
386 panic("Cannot find space for the kernel page tables");
388 table_start >>= PAGE_SHIFT;
389 table_end = table_start;
391 early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n",
392 end, table_start << PAGE_SHIFT,
393 (table_start << PAGE_SHIFT) + tables);
397 * Setup the direct mapping of the physical memory at PAGE_OFFSET.
398 * This runs before bootmem is initialized and gets pages directly from
399 * the physical memory. To access them they are temporarily mapped.
401 void __init_refok init_memory_mapping(unsigned long start, unsigned long end)
403 unsigned long next;
405 pr_debug("init_memory_mapping\n");
408 * Find space for the kernel direct mapping tables.
410 * Later we should allocate these tables in the local node of the
411 * memory mapped. Unfortunately this is done currently before the
412 * nodes are discovered.
414 if (!after_bootmem)
415 find_early_table_space(end);
417 start = (unsigned long)__va(start);
418 end = (unsigned long)__va(end);
420 for (; start < end; start = next) {
421 pgd_t *pgd = pgd_offset_k(start);
422 unsigned long pud_phys;
423 pud_t *pud;
425 if (after_bootmem)
426 pud = pud_offset(pgd, start & PGDIR_MASK);
427 else
428 pud = alloc_low_page(&pud_phys);
430 next = start + PGDIR_SIZE;
431 if (next > end)
432 next = end;
433 phys_pud_init(pud, __pa(start), __pa(next));
434 if (!after_bootmem)
435 set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
436 unmap_low_page(pud);
439 if (!after_bootmem)
440 mmu_cr4_features = read_cr4();
441 __flush_tlb_all();
443 if (!after_bootmem)
444 reserve_early(table_start << PAGE_SHIFT,
445 table_end << PAGE_SHIFT, "PGTABLE");
448 #ifndef CONFIG_NUMA
449 void __init paging_init(void)
451 unsigned long max_zone_pfns[MAX_NR_ZONES];
453 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
454 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
455 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
456 max_zone_pfns[ZONE_NORMAL] = end_pfn;
458 memory_present(0, 0, end_pfn);
459 sparse_init();
460 free_area_init_nodes(max_zone_pfns);
462 #endif
465 * Memory hotplug specific functions
467 void online_page(struct page *page)
469 ClearPageReserved(page);
470 init_page_count(page);
471 __free_page(page);
472 totalram_pages++;
473 num_physpages++;
476 #ifdef CONFIG_MEMORY_HOTPLUG
478 * Memory is added always to NORMAL zone. This means you will never get
479 * additional DMA/DMA32 memory.
481 int arch_add_memory(int nid, u64 start, u64 size)
483 struct pglist_data *pgdat = NODE_DATA(nid);
484 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
485 unsigned long start_pfn = start >> PAGE_SHIFT;
486 unsigned long nr_pages = size >> PAGE_SHIFT;
487 int ret;
489 init_memory_mapping(start, start + size-1);
491 ret = __add_pages(zone, start_pfn, nr_pages);
492 WARN_ON(1);
494 return ret;
496 EXPORT_SYMBOL_GPL(arch_add_memory);
498 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
499 int memory_add_physaddr_to_nid(u64 start)
501 return 0;
503 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
504 #endif
506 #endif /* CONFIG_MEMORY_HOTPLUG */
508 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
509 kcore_modules, kcore_vsyscall;
511 void __init mem_init(void)
513 long codesize, reservedpages, datasize, initsize;
515 pci_iommu_alloc();
517 /* clear_bss() already clear the empty_zero_page */
519 reservedpages = 0;
521 /* this will put all low memory onto the freelists */
522 #ifdef CONFIG_NUMA
523 totalram_pages = numa_free_all_bootmem();
524 #else
525 totalram_pages = free_all_bootmem();
526 #endif
527 reservedpages = end_pfn - totalram_pages -
528 absent_pages_in_range(0, end_pfn);
529 after_bootmem = 1;
531 codesize = (unsigned long) &_etext - (unsigned long) &_text;
532 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
533 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
535 /* Register memory areas for /proc/kcore */
536 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
537 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
538 VMALLOC_END-VMALLOC_START);
539 kclist_add(&kcore_kernel, &_stext, _end - _stext);
540 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
541 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
542 VSYSCALL_END - VSYSCALL_START);
544 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
545 "%ldk reserved, %ldk data, %ldk init)\n",
546 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
547 end_pfn << (PAGE_SHIFT-10),
548 codesize >> 10,
549 reservedpages << (PAGE_SHIFT-10),
550 datasize >> 10,
551 initsize >> 10);
553 cpa_init();
556 void free_init_pages(char *what, unsigned long begin, unsigned long end)
558 unsigned long addr = begin;
560 if (addr >= end)
561 return;
564 * If debugging page accesses then do not free this memory but
565 * mark them not present - any buggy init-section access will
566 * create a kernel page fault:
568 #ifdef CONFIG_DEBUG_PAGEALLOC
569 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
570 begin, PAGE_ALIGN(end));
571 set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
572 #else
573 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
575 for (; addr < end; addr += PAGE_SIZE) {
576 ClearPageReserved(virt_to_page(addr));
577 init_page_count(virt_to_page(addr));
578 memset((void *)(addr & ~(PAGE_SIZE-1)),
579 POISON_FREE_INITMEM, PAGE_SIZE);
580 free_page(addr);
581 totalram_pages++;
583 #endif
586 void free_initmem(void)
588 free_init_pages("unused kernel memory",
589 (unsigned long)(&__init_begin),
590 (unsigned long)(&__init_end));
593 #ifdef CONFIG_DEBUG_RODATA
594 const int rodata_test_data = 0xC3;
595 EXPORT_SYMBOL_GPL(rodata_test_data);
597 void mark_rodata_ro(void)
599 unsigned long start = (unsigned long)_stext, end;
601 #ifdef CONFIG_HOTPLUG_CPU
602 /* It must still be possible to apply SMP alternatives. */
603 if (num_possible_cpus() > 1)
604 start = (unsigned long)_etext;
605 #endif
607 #ifdef CONFIG_KPROBES
608 start = (unsigned long)__start_rodata;
609 #endif
611 end = (unsigned long)__end_rodata;
612 start = (start + PAGE_SIZE - 1) & PAGE_MASK;
613 end &= PAGE_MASK;
614 if (end <= start)
615 return;
618 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
619 (end - start) >> 10);
620 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
623 * The rodata section (but not the kernel text!) should also be
624 * not-executable.
626 start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
627 set_memory_nx(start, (end - start) >> PAGE_SHIFT);
629 rodata_test();
631 #ifdef CONFIG_CPA_DEBUG
632 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
633 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
635 printk(KERN_INFO "Testing CPA: again\n");
636 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
637 #endif
639 #endif
641 #ifdef CONFIG_BLK_DEV_INITRD
642 void free_initrd_mem(unsigned long start, unsigned long end)
644 free_init_pages("initrd memory", start, end);
646 #endif
648 void __init reserve_bootmem_generic(unsigned long phys, unsigned len)
650 #ifdef CONFIG_NUMA
651 int nid = phys_to_nid(phys);
652 #endif
653 unsigned long pfn = phys >> PAGE_SHIFT;
655 if (pfn >= end_pfn) {
657 * This can happen with kdump kernels when accessing
658 * firmware tables:
660 if (pfn < end_pfn_map)
661 return;
663 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",
664 phys, len);
665 return;
668 /* Should check here against the e820 map to avoid double free */
669 #ifdef CONFIG_NUMA
670 reserve_bootmem_node(NODE_DATA(nid), phys, len, BOOTMEM_DEFAULT);
671 #else
672 reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
673 #endif
674 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
675 dma_reserve += len / PAGE_SIZE;
676 set_dma_reserve(dma_reserve);
680 int kern_addr_valid(unsigned long addr)
682 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
683 pgd_t *pgd;
684 pud_t *pud;
685 pmd_t *pmd;
686 pte_t *pte;
688 if (above != 0 && above != -1UL)
689 return 0;
691 pgd = pgd_offset_k(addr);
692 if (pgd_none(*pgd))
693 return 0;
695 pud = pud_offset(pgd, addr);
696 if (pud_none(*pud))
697 return 0;
699 pmd = pmd_offset(pud, addr);
700 if (pmd_none(*pmd))
701 return 0;
703 if (pmd_large(*pmd))
704 return pfn_valid(pmd_pfn(*pmd));
706 pte = pte_offset_kernel(pmd, addr);
707 if (pte_none(*pte))
708 return 0;
710 return pfn_valid(pte_pfn(*pte));
714 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
715 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
716 * not need special handling anymore:
718 static struct vm_area_struct gate_vma = {
719 .vm_start = VSYSCALL_START,
720 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
721 .vm_page_prot = PAGE_READONLY_EXEC,
722 .vm_flags = VM_READ | VM_EXEC
725 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
727 #ifdef CONFIG_IA32_EMULATION
728 if (test_tsk_thread_flag(tsk, TIF_IA32))
729 return NULL;
730 #endif
731 return &gate_vma;
734 int in_gate_area(struct task_struct *task, unsigned long addr)
736 struct vm_area_struct *vma = get_gate_vma(task);
738 if (!vma)
739 return 0;
741 return (addr >= vma->vm_start) && (addr < vma->vm_end);
745 * Use this when you have no reliable task/vma, typically from interrupt
746 * context. It is less reliable than using the task's vma and may give
747 * false positives:
749 int in_gate_area_no_task(unsigned long addr)
751 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
754 const char *arch_vma_name(struct vm_area_struct *vma)
756 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
757 return "[vdso]";
758 if (vma == &gate_vma)
759 return "[vsyscall]";
760 return NULL;
763 #ifdef CONFIG_SPARSEMEM_VMEMMAP
765 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
767 int __meminit
768 vmemmap_populate(struct page *start_page, unsigned long size, int node)
770 unsigned long addr = (unsigned long)start_page;
771 unsigned long end = (unsigned long)(start_page + size);
772 unsigned long next;
773 pgd_t *pgd;
774 pud_t *pud;
775 pmd_t *pmd;
777 for (; addr < end; addr = next) {
778 next = pmd_addr_end(addr, end);
780 pgd = vmemmap_pgd_populate(addr, node);
781 if (!pgd)
782 return -ENOMEM;
784 pud = vmemmap_pud_populate(pgd, addr, node);
785 if (!pud)
786 return -ENOMEM;
788 pmd = pmd_offset(pud, addr);
789 if (pmd_none(*pmd)) {
790 pte_t entry;
791 void *p;
793 p = vmemmap_alloc_block(PMD_SIZE, node);
794 if (!p)
795 return -ENOMEM;
797 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
798 PAGE_KERNEL_LARGE);
799 set_pmd(pmd, __pmd(pte_val(entry)));
801 printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n",
802 addr, addr + PMD_SIZE - 1, p, node);
803 } else {
804 vmemmap_verify((pte_t *)pmd, node, addr, next);
807 return 0;
809 #endif