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>
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>
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>
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>
40 #include <asm/fixmap.h>
44 #include <asm/mmu_context.h>
45 #include <asm/proto.h>
47 #include <asm/sections.h>
48 #include <asm/kdebug.h>
50 #include <asm/cacheflush.h>
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.
57 unsigned long max_low_pfn_mapped;
58 unsigned long max_pfn_mapped;
60 static unsigned long dma_reserve __initdata;
62 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
64 static int __init parse_direct_gbpages_off(char *arg)
69 early_param("nogbpages", parse_direct_gbpages_off);
71 static int __init parse_direct_gbpages_on(char *arg)
76 early_param("gbpages", parse_direct_gbpages_on);
79 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
80 * physical space so we can cache the place of the first one and move
81 * around without checking the pgd every time.
84 pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
85 EXPORT_SYMBOL_GPL(__supported_pte_mask);
87 static int do_not_nx __cpuinitdata;
91 * Control non-executable mappings for 64-bit processes.
96 static int __init nonx_setup(char *str)
100 if (!strncmp(str, "on", 2)) {
101 __supported_pte_mask |= _PAGE_NX;
103 } else if (!strncmp(str, "off", 3)) {
105 __supported_pte_mask &= ~_PAGE_NX;
109 early_param("noexec", nonx_setup);
111 void __cpuinit check_efer(void)
115 rdmsrl(MSR_EFER, efer);
116 if (!(efer & EFER_NX) || do_not_nx)
117 __supported_pte_mask &= ~_PAGE_NX;
120 int force_personality32;
124 * Control non executable heap for 32bit processes.
125 * To control the stack too use noexec=off
127 * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
128 * off PROT_READ implies PROT_EXEC
130 static int __init nonx32_setup(char *str)
132 if (!strcmp(str, "on"))
133 force_personality32 &= ~READ_IMPLIES_EXEC;
134 else if (!strcmp(str, "off"))
135 force_personality32 |= READ_IMPLIES_EXEC;
138 __setup("noexec32=", nonx32_setup);
141 * NOTE: This function is marked __ref because it calls __init function
142 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
144 static __ref void *spp_getpage(void)
149 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
151 ptr = alloc_bootmem_pages(PAGE_SIZE);
153 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
154 panic("set_pte_phys: cannot allocate page data %s\n",
155 after_bootmem ? "after bootmem" : "");
158 pr_debug("spp_getpage %p\n", ptr);
164 set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
170 pud = pud_page + pud_index(vaddr);
171 if (pud_none(*pud)) {
172 pmd = (pmd_t *) spp_getpage();
173 pud_populate(&init_mm, pud, pmd);
174 if (pmd != pmd_offset(pud, 0)) {
175 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
176 pmd, pmd_offset(pud, 0));
180 pmd = pmd_offset(pud, vaddr);
181 if (pmd_none(*pmd)) {
182 pte = (pte_t *) spp_getpage();
183 pmd_populate_kernel(&init_mm, pmd, pte);
184 if (pte != pte_offset_kernel(pmd, 0)) {
185 printk(KERN_ERR "PAGETABLE BUG #02!\n");
190 pte = pte_offset_kernel(pmd, vaddr);
191 set_pte(pte, new_pte);
194 * It's enough to flush this one mapping.
195 * (PGE mappings get flushed as well)
197 __flush_tlb_one(vaddr);
201 set_pte_vaddr(unsigned long vaddr, pte_t pteval)
206 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
208 pgd = pgd_offset_k(vaddr);
209 if (pgd_none(*pgd)) {
211 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
214 pud_page = (pud_t*)pgd_page_vaddr(*pgd);
215 set_pte_vaddr_pud(pud_page, vaddr, pteval);
219 * Create large page table mappings for a range of physical addresses.
221 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
228 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
229 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
230 pgd = pgd_offset_k((unsigned long)__va(phys));
231 if (pgd_none(*pgd)) {
232 pud = (pud_t *) spp_getpage();
233 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
236 pud = pud_offset(pgd, (unsigned long)__va(phys));
237 if (pud_none(*pud)) {
238 pmd = (pmd_t *) spp_getpage();
239 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
242 pmd = pmd_offset(pud, phys);
243 BUG_ON(!pmd_none(*pmd));
244 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
248 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
250 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE);
253 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
255 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
259 * The head.S code sets up the kernel high mapping:
261 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
263 * phys_addr holds the negative offset to the kernel, which is added
264 * to the compile time generated pmds. This results in invalid pmds up
265 * to the point where we hit the physaddr 0 mapping.
267 * We limit the mappings to the region from _text to _end. _end is
268 * rounded up to the 2MB boundary. This catches the invalid pmds as
269 * well, as they are located before _text:
271 void __init cleanup_highmap(void)
273 unsigned long vaddr = __START_KERNEL_map;
274 unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
275 pmd_t *pmd = level2_kernel_pgt;
276 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
278 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
281 if (vaddr < (unsigned long) _text || vaddr > end)
282 set_pmd(pmd, __pmd(0));
286 extern unsigned long __initdata e820_table_start;
287 extern unsigned long __meminitdata e820_table_end;
288 extern unsigned long __meminitdata e820_table_top;
290 static __ref void *alloc_low_page(unsigned long *phys)
292 unsigned long pfn = e820_table_end++;
296 adr = (void *)get_zeroed_page(GFP_ATOMIC);
302 if (pfn >= e820_table_top)
303 panic("alloc_low_page: ran out of memory");
305 adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
306 memset(adr, 0, PAGE_SIZE);
307 *phys = pfn * PAGE_SIZE;
311 static __ref void unmap_low_page(void *adr)
316 early_iounmap(adr, PAGE_SIZE);
319 static unsigned long __meminit
320 phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
324 unsigned long last_map_addr = end;
327 pte_t *pte = pte_page + pte_index(addr);
329 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) {
332 if (!after_bootmem) {
333 for(; i < PTRS_PER_PTE; i++, pte++)
334 set_pte(pte, __pte(0));
340 * We will re-use the existing mapping.
341 * Xen for example has some special requirements, like mapping
342 * pagetable pages as RO. So assume someone who pre-setup
343 * these mappings are more intelligent.
351 printk(" pte=%p addr=%lx pte=%016lx\n",
352 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
354 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
355 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
358 update_page_count(PG_LEVEL_4K, pages);
360 return last_map_addr;
363 static unsigned long __meminit
364 phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end,
367 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd);
369 return phys_pte_init(pte, address, end, prot);
372 static unsigned long __meminit
373 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
374 unsigned long page_size_mask, pgprot_t prot)
376 unsigned long pages = 0;
377 unsigned long last_map_addr = end;
379 int i = pmd_index(address);
381 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
382 unsigned long pte_phys;
383 pmd_t *pmd = pmd_page + pmd_index(address);
385 pgprot_t new_prot = prot;
387 if (address >= end) {
388 if (!after_bootmem) {
389 for (; i < PTRS_PER_PMD; i++, pmd++)
390 set_pmd(pmd, __pmd(0));
396 if (!pmd_large(*pmd)) {
397 spin_lock(&init_mm.page_table_lock);
398 last_map_addr = phys_pte_update(pmd, address,
400 spin_unlock(&init_mm.page_table_lock);
404 * If we are ok with PG_LEVEL_2M mapping, then we will
405 * use the existing mapping,
407 * Otherwise, we will split the large page mapping but
408 * use the same existing protection bits except for
409 * large page, so that we don't violate Intel's TLB
410 * Application note (317080) which says, while changing
411 * the page sizes, new and old translations should
412 * not differ with respect to page frame and
415 if (page_size_mask & (1 << PG_LEVEL_2M)) {
419 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
422 if (page_size_mask & (1<<PG_LEVEL_2M)) {
424 spin_lock(&init_mm.page_table_lock);
425 set_pte((pte_t *)pmd,
426 pfn_pte(address >> PAGE_SHIFT,
427 __pgprot(pgprot_val(prot) | _PAGE_PSE)));
428 spin_unlock(&init_mm.page_table_lock);
429 last_map_addr = (address & PMD_MASK) + PMD_SIZE;
433 pte = alloc_low_page(&pte_phys);
434 last_map_addr = phys_pte_init(pte, address, end, new_prot);
437 spin_lock(&init_mm.page_table_lock);
438 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));
439 spin_unlock(&init_mm.page_table_lock);
441 update_page_count(PG_LEVEL_2M, pages);
442 return last_map_addr;
445 static unsigned long __meminit
446 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end,
447 unsigned long page_size_mask, pgprot_t prot)
449 pmd_t *pmd = pmd_offset(pud, 0);
450 unsigned long last_map_addr;
452 last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot);
454 return last_map_addr;
457 static unsigned long __meminit
458 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
459 unsigned long page_size_mask)
461 unsigned long pages = 0;
462 unsigned long last_map_addr = end;
463 int i = pud_index(addr);
465 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
466 unsigned long pmd_phys;
467 pud_t *pud = pud_page + pud_index(addr);
469 pgprot_t prot = PAGE_KERNEL;
474 if (!after_bootmem &&
475 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
476 set_pud(pud, __pud(0));
481 if (!pud_large(*pud)) {
482 last_map_addr = phys_pmd_update(pud, addr, end,
483 page_size_mask, prot);
487 * If we are ok with PG_LEVEL_1G mapping, then we will
488 * use the existing mapping.
490 * Otherwise, we will split the gbpage mapping but use
491 * the same existing protection bits except for large
492 * page, so that we don't violate Intel's TLB
493 * Application note (317080) which says, while changing
494 * the page sizes, new and old translations should
495 * not differ with respect to page frame and
498 if (page_size_mask & (1 << PG_LEVEL_1G)) {
502 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
505 if (page_size_mask & (1<<PG_LEVEL_1G)) {
507 spin_lock(&init_mm.page_table_lock);
508 set_pte((pte_t *)pud,
509 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
510 spin_unlock(&init_mm.page_table_lock);
511 last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
515 pmd = alloc_low_page(&pmd_phys);
516 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
520 spin_lock(&init_mm.page_table_lock);
521 pud_populate(&init_mm, pud, __va(pmd_phys));
522 spin_unlock(&init_mm.page_table_lock);
526 update_page_count(PG_LEVEL_1G, pages);
528 return last_map_addr;
531 static unsigned long __meminit
532 phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end,
533 unsigned long page_size_mask)
537 pud = (pud_t *)pgd_page_vaddr(*pgd);
539 return phys_pud_init(pud, addr, end, page_size_mask);
542 unsigned long __meminit
543 kernel_physical_mapping_init(unsigned long start,
545 unsigned long page_size_mask)
548 unsigned long next, last_map_addr = end;
550 start = (unsigned long)__va(start);
551 end = (unsigned long)__va(end);
553 for (; start < end; start = next) {
554 pgd_t *pgd = pgd_offset_k(start);
555 unsigned long pud_phys;
558 next = (start + PGDIR_SIZE) & PGDIR_MASK;
563 last_map_addr = phys_pud_update(pgd, __pa(start),
564 __pa(end), page_size_mask);
568 pud = alloc_low_page(&pud_phys);
569 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
573 spin_lock(&init_mm.page_table_lock);
574 pgd_populate(&init_mm, pgd, __va(pud_phys));
575 spin_unlock(&init_mm.page_table_lock);
579 return last_map_addr;
583 void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
585 unsigned long bootmap_size, bootmap;
587 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
588 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
591 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
592 /* don't touch min_low_pfn */
593 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
595 e820_register_active_regions(0, start_pfn, end_pfn);
596 free_bootmem_with_active_regions(0, end_pfn);
597 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
598 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
601 void __init paging_init(void)
603 unsigned long max_zone_pfns[MAX_NR_ZONES];
605 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
606 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
607 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
608 max_zone_pfns[ZONE_NORMAL] = max_pfn;
610 memory_present(0, 0, max_pfn);
612 free_area_init_nodes(max_zone_pfns);
617 * Memory hotplug specific functions
619 #ifdef CONFIG_MEMORY_HOTPLUG
621 * Memory is added always to NORMAL zone. This means you will never get
622 * additional DMA/DMA32 memory.
624 int arch_add_memory(int nid, u64 start, u64 size)
626 struct pglist_data *pgdat = NODE_DATA(nid);
627 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
628 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
629 unsigned long nr_pages = size >> PAGE_SHIFT;
632 last_mapped_pfn = init_memory_mapping(start, start + size);
633 if (last_mapped_pfn > max_pfn_mapped)
634 max_pfn_mapped = last_mapped_pfn;
636 ret = __add_pages(nid, zone, start_pfn, nr_pages);
641 EXPORT_SYMBOL_GPL(arch_add_memory);
643 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
644 int memory_add_physaddr_to_nid(u64 start)
648 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
651 #endif /* CONFIG_MEMORY_HOTPLUG */
653 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
654 kcore_modules, kcore_vsyscall;
656 void __init mem_init(void)
658 long codesize, reservedpages, datasize, initsize;
659 unsigned long absent_pages;
663 /* clear_bss() already clear the empty_zero_page */
667 /* this will put all low memory onto the freelists */
669 totalram_pages = numa_free_all_bootmem();
671 totalram_pages = free_all_bootmem();
674 absent_pages = absent_pages_in_range(0, max_pfn);
675 reservedpages = max_pfn - totalram_pages - absent_pages;
678 codesize = (unsigned long) &_etext - (unsigned long) &_text;
679 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
680 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
682 /* Register memory areas for /proc/kcore */
683 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
684 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
685 VMALLOC_END-VMALLOC_START);
686 kclist_add(&kcore_kernel, &_stext, _end - _stext);
687 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
688 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
689 VSYSCALL_END - VSYSCALL_START);
691 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
692 "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
693 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
694 max_pfn << (PAGE_SHIFT-10),
696 absent_pages << (PAGE_SHIFT-10),
697 reservedpages << (PAGE_SHIFT-10),
702 #ifdef CONFIG_DEBUG_RODATA
703 const int rodata_test_data = 0xC3;
704 EXPORT_SYMBOL_GPL(rodata_test_data);
706 void mark_rodata_ro(void)
708 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
709 unsigned long rodata_start =
710 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
712 #ifdef CONFIG_DYNAMIC_FTRACE
713 /* Dynamic tracing modifies the kernel text section */
714 start = rodata_start;
717 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
718 (end - start) >> 10);
719 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
722 * The rodata section (but not the kernel text!) should also be
725 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT);
729 #ifdef CONFIG_CPA_DEBUG
730 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
731 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
733 printk(KERN_INFO "Testing CPA: again\n");
734 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
740 int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
747 unsigned long pfn = phys >> PAGE_SHIFT;
749 if (pfn >= max_pfn) {
751 * This can happen with kdump kernels when accessing
754 if (pfn < max_pfn_mapped)
757 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n",
762 /* Should check here against the e820 map to avoid double free */
764 nid = phys_to_nid(phys);
765 next_nid = phys_to_nid(phys + len - 1);
767 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags);
769 ret = reserve_bootmem(phys, len, flags);
775 reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
778 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
779 dma_reserve += len / PAGE_SIZE;
780 set_dma_reserve(dma_reserve);
786 int kern_addr_valid(unsigned long addr)
788 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
794 if (above != 0 && above != -1UL)
797 pgd = pgd_offset_k(addr);
801 pud = pud_offset(pgd, addr);
805 pmd = pmd_offset(pud, addr);
810 return pfn_valid(pmd_pfn(*pmd));
812 pte = pte_offset_kernel(pmd, addr);
816 return pfn_valid(pte_pfn(*pte));
820 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
821 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
822 * not need special handling anymore:
824 static struct vm_area_struct gate_vma = {
825 .vm_start = VSYSCALL_START,
826 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
827 .vm_page_prot = PAGE_READONLY_EXEC,
828 .vm_flags = VM_READ | VM_EXEC
831 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
833 #ifdef CONFIG_IA32_EMULATION
834 if (test_tsk_thread_flag(tsk, TIF_IA32))
840 int in_gate_area(struct task_struct *task, unsigned long addr)
842 struct vm_area_struct *vma = get_gate_vma(task);
847 return (addr >= vma->vm_start) && (addr < vma->vm_end);
851 * Use this when you have no reliable task/vma, typically from interrupt
852 * context. It is less reliable than using the task's vma and may give
855 int in_gate_area_no_task(unsigned long addr)
857 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
860 const char *arch_vma_name(struct vm_area_struct *vma)
862 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
864 if (vma == &gate_vma)
869 #ifdef CONFIG_SPARSEMEM_VMEMMAP
871 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
873 static long __meminitdata addr_start, addr_end;
874 static void __meminitdata *p_start, *p_end;
875 static int __meminitdata node_start;
878 vmemmap_populate(struct page *start_page, unsigned long size, int node)
880 unsigned long addr = (unsigned long)start_page;
881 unsigned long end = (unsigned long)(start_page + size);
887 for (; addr < end; addr = next) {
890 pgd = vmemmap_pgd_populate(addr, node);
894 pud = vmemmap_pud_populate(pgd, addr, node);
899 next = (addr + PAGE_SIZE) & PAGE_MASK;
900 pmd = vmemmap_pmd_populate(pud, addr, node);
905 p = vmemmap_pte_populate(pmd, addr, node);
910 addr_end = addr + PAGE_SIZE;
911 p_end = p + PAGE_SIZE;
913 next = pmd_addr_end(addr, end);
915 pmd = pmd_offset(pud, addr);
916 if (pmd_none(*pmd)) {
919 p = vmemmap_alloc_block(PMD_SIZE, node);
923 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
925 set_pmd(pmd, __pmd(pte_val(entry)));
927 /* check to see if we have contiguous blocks */
928 if (p_end != p || node_start != node) {
930 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
931 addr_start, addr_end-1, p_start, p_end-1, node_start);
937 addr_end = addr + PMD_SIZE;
938 p_end = p + PMD_SIZE;
940 vmemmap_verify((pte_t *)pmd, node, addr, next);
947 void __meminit vmemmap_populate_print_last(void)
950 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
951 addr_start, addr_end-1, p_start, p_end-1, node_start);