2 * linux/arch/x86_64/mm/init.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 2000 Pavel Machek <pavel@ucw.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/memblock.h>
25 #include <linux/proc_fs.h>
26 #include <linux/pci.h>
27 #include <linux/pfn.h>
28 #include <linux/poison.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/module.h>
31 #include <linux/memory_hotplug.h>
32 #include <linux/nmi.h>
33 #include <linux/gfp.h>
35 #include <asm/processor.h>
36 #include <asm/bios_ebda.h>
37 #include <asm/system.h>
38 #include <asm/uaccess.h>
39 #include <asm/pgtable.h>
40 #include <asm/pgalloc.h>
42 #include <asm/fixmap.h>
46 #include <asm/mmu_context.h>
47 #include <asm/proto.h>
49 #include <asm/sections.h>
50 #include <asm/kdebug.h>
52 #include <asm/cacheflush.h>
54 #include <asm/uv/uv.h>
56 static int __init parse_direct_gbpages_off(char *arg)
61 early_param("nogbpages", parse_direct_gbpages_off);
63 static int __init parse_direct_gbpages_on(char *arg)
68 early_param("gbpages", parse_direct_gbpages_on);
71 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
72 * physical space so we can cache the place of the first one and move
73 * around without checking the pgd every time.
76 pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
77 EXPORT_SYMBOL_GPL(__supported_pte_mask);
79 int force_personality32;
83 * Control non executable heap for 32bit processes.
84 * To control the stack too use noexec=off
86 * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
87 * off PROT_READ implies PROT_EXEC
89 static int __init nonx32_setup(char *str)
91 if (!strcmp(str, "on"))
92 force_personality32 &= ~READ_IMPLIES_EXEC;
93 else if (!strcmp(str, "off"))
94 force_personality32 |= READ_IMPLIES_EXEC;
97 __setup("noexec32=", nonx32_setup);
100 * When memory was added/removed make sure all the processes MM have
101 * suitable PGD entries in the local PGD level page.
103 void sync_global_pgds(unsigned long start, unsigned long end)
105 unsigned long address;
107 for (address = start; address <= end; address += PGDIR_SIZE) {
108 const pgd_t *pgd_ref = pgd_offset_k(address);
111 if (pgd_none(*pgd_ref))
114 spin_lock(&pgd_lock);
115 list_for_each_entry(page, &pgd_list, lru) {
117 spinlock_t *pgt_lock;
119 pgd = (pgd_t *)page_address(page) + pgd_index(address);
120 /* the pgt_lock only for Xen */
121 pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
125 set_pgd(pgd, *pgd_ref);
127 BUG_ON(pgd_page_vaddr(*pgd)
128 != pgd_page_vaddr(*pgd_ref));
130 spin_unlock(pgt_lock);
132 spin_unlock(&pgd_lock);
137 * NOTE: This function is marked __ref because it calls __init function
138 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
140 static __ref void *spp_getpage(void)
145 ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
147 ptr = alloc_bootmem_pages(PAGE_SIZE);
149 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
150 panic("set_pte_phys: cannot allocate page data %s\n",
151 after_bootmem ? "after bootmem" : "");
154 pr_debug("spp_getpage %p\n", ptr);
159 static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
161 if (pgd_none(*pgd)) {
162 pud_t *pud = (pud_t *)spp_getpage();
163 pgd_populate(&init_mm, pgd, pud);
164 if (pud != pud_offset(pgd, 0))
165 printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
166 pud, pud_offset(pgd, 0));
168 return pud_offset(pgd, vaddr);
171 static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
173 if (pud_none(*pud)) {
174 pmd_t *pmd = (pmd_t *) spp_getpage();
175 pud_populate(&init_mm, pud, pmd);
176 if (pmd != pmd_offset(pud, 0))
177 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
178 pmd, pmd_offset(pud, 0));
180 return pmd_offset(pud, vaddr);
183 static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
185 if (pmd_none(*pmd)) {
186 pte_t *pte = (pte_t *) spp_getpage();
187 pmd_populate_kernel(&init_mm, pmd, pte);
188 if (pte != pte_offset_kernel(pmd, 0))
189 printk(KERN_ERR "PAGETABLE BUG #02!\n");
191 return pte_offset_kernel(pmd, vaddr);
194 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
200 pud = pud_page + pud_index(vaddr);
201 pmd = fill_pmd(pud, vaddr);
202 pte = fill_pte(pmd, vaddr);
204 set_pte(pte, new_pte);
207 * It's enough to flush this one mapping.
208 * (PGE mappings get flushed as well)
210 __flush_tlb_one(vaddr);
213 void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
218 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
220 pgd = pgd_offset_k(vaddr);
221 if (pgd_none(*pgd)) {
223 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
226 pud_page = (pud_t*)pgd_page_vaddr(*pgd);
227 set_pte_vaddr_pud(pud_page, vaddr, pteval);
230 pmd_t * __init populate_extra_pmd(unsigned long vaddr)
235 pgd = pgd_offset_k(vaddr);
236 pud = fill_pud(pgd, vaddr);
237 return fill_pmd(pud, vaddr);
240 pte_t * __init populate_extra_pte(unsigned long vaddr)
244 pmd = populate_extra_pmd(vaddr);
245 return fill_pte(pmd, vaddr);
249 * Create large page table mappings for a range of physical addresses.
251 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
258 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
259 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
260 pgd = pgd_offset_k((unsigned long)__va(phys));
261 if (pgd_none(*pgd)) {
262 pud = (pud_t *) spp_getpage();
263 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
266 pud = pud_offset(pgd, (unsigned long)__va(phys));
267 if (pud_none(*pud)) {
268 pmd = (pmd_t *) spp_getpage();
269 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
272 pmd = pmd_offset(pud, phys);
273 BUG_ON(!pmd_none(*pmd));
274 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
278 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
280 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE);
283 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
285 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
289 * The head.S code sets up the kernel high mapping:
291 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
293 * phys_addr holds the negative offset to the kernel, which is added
294 * to the compile time generated pmds. This results in invalid pmds up
295 * to the point where we hit the physaddr 0 mapping.
297 * We limit the mappings to the region from _text to _end. _end is
298 * rounded up to the 2MB boundary. This catches the invalid pmds as
299 * well, as they are located before _text:
301 void __init cleanup_highmap(void)
303 unsigned long vaddr = __START_KERNEL_map;
304 unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
305 pmd_t *pmd = level2_kernel_pgt;
306 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
308 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
311 if (vaddr < (unsigned long) _text || vaddr > end)
312 set_pmd(pmd, __pmd(0));
316 static __ref void *alloc_low_page(unsigned long *phys)
318 unsigned long pfn = pgt_buf_end++;
322 adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
328 if (pfn >= pgt_buf_top)
329 panic("alloc_low_page: ran out of memory");
331 adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
333 *phys = pfn * PAGE_SIZE;
337 static __ref void *map_low_page(void *virt)
340 unsigned long phys, left;
346 left = phys & (PAGE_SIZE - 1);
347 adr = early_memremap(phys & PAGE_MASK, PAGE_SIZE);
348 adr = (void *)(((unsigned long)adr) | left);
353 static __ref void unmap_low_page(void *adr)
358 early_iounmap((void *)((unsigned long)adr & PAGE_MASK), PAGE_SIZE);
361 static unsigned long __meminit
362 phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
366 unsigned long last_map_addr = end;
369 pte_t *pte = pte_page + pte_index(addr);
371 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) {
374 if (!after_bootmem) {
375 for(; i < PTRS_PER_PTE; i++, pte++)
376 set_pte(pte, __pte(0));
382 * We will re-use the existing mapping.
383 * Xen for example has some special requirements, like mapping
384 * pagetable pages as RO. So assume someone who pre-setup
385 * these mappings are more intelligent.
393 printk(" pte=%p addr=%lx pte=%016lx\n",
394 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
396 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
397 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
400 update_page_count(PG_LEVEL_4K, pages);
402 return last_map_addr;
405 static unsigned long __meminit
406 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
407 unsigned long page_size_mask, pgprot_t prot)
409 unsigned long pages = 0;
410 unsigned long last_map_addr = end;
412 int i = pmd_index(address);
414 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
415 unsigned long pte_phys;
416 pmd_t *pmd = pmd_page + pmd_index(address);
418 pgprot_t new_prot = prot;
420 if (address >= end) {
421 if (!after_bootmem) {
422 for (; i < PTRS_PER_PMD; i++, pmd++)
423 set_pmd(pmd, __pmd(0));
429 if (!pmd_large(*pmd)) {
430 spin_lock(&init_mm.page_table_lock);
431 pte = map_low_page((pte_t *)pmd_page_vaddr(*pmd));
432 last_map_addr = phys_pte_init(pte, address,
435 spin_unlock(&init_mm.page_table_lock);
439 * If we are ok with PG_LEVEL_2M mapping, then we will
440 * use the existing mapping,
442 * Otherwise, we will split the large page mapping but
443 * use the same existing protection bits except for
444 * large page, so that we don't violate Intel's TLB
445 * Application note (317080) which says, while changing
446 * the page sizes, new and old translations should
447 * not differ with respect to page frame and
450 if (page_size_mask & (1 << PG_LEVEL_2M)) {
454 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
457 if (page_size_mask & (1<<PG_LEVEL_2M)) {
459 spin_lock(&init_mm.page_table_lock);
460 set_pte((pte_t *)pmd,
461 pfn_pte(address >> PAGE_SHIFT,
462 __pgprot(pgprot_val(prot) | _PAGE_PSE)));
463 spin_unlock(&init_mm.page_table_lock);
464 last_map_addr = (address & PMD_MASK) + PMD_SIZE;
468 pte = alloc_low_page(&pte_phys);
469 last_map_addr = phys_pte_init(pte, address, end, new_prot);
472 spin_lock(&init_mm.page_table_lock);
473 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));
474 spin_unlock(&init_mm.page_table_lock);
476 update_page_count(PG_LEVEL_2M, pages);
477 return last_map_addr;
480 static unsigned long __meminit
481 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
482 unsigned long page_size_mask)
484 unsigned long pages = 0;
485 unsigned long last_map_addr = end;
486 int i = pud_index(addr);
488 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
489 unsigned long pmd_phys;
490 pud_t *pud = pud_page + pud_index(addr);
492 pgprot_t prot = PAGE_KERNEL;
497 if (!after_bootmem &&
498 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
499 set_pud(pud, __pud(0));
504 if (!pud_large(*pud)) {
505 pmd = map_low_page(pmd_offset(pud, 0));
506 last_map_addr = phys_pmd_init(pmd, addr, end,
507 page_size_mask, prot);
513 * If we are ok with PG_LEVEL_1G mapping, then we will
514 * use the existing mapping.
516 * Otherwise, we will split the gbpage mapping but use
517 * the same existing protection bits except for large
518 * page, so that we don't violate Intel's TLB
519 * Application note (317080) which says, while changing
520 * the page sizes, new and old translations should
521 * not differ with respect to page frame and
524 if (page_size_mask & (1 << PG_LEVEL_1G)) {
528 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
531 if (page_size_mask & (1<<PG_LEVEL_1G)) {
533 spin_lock(&init_mm.page_table_lock);
534 set_pte((pte_t *)pud,
535 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
536 spin_unlock(&init_mm.page_table_lock);
537 last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
541 pmd = alloc_low_page(&pmd_phys);
542 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
546 spin_lock(&init_mm.page_table_lock);
547 pud_populate(&init_mm, pud, __va(pmd_phys));
548 spin_unlock(&init_mm.page_table_lock);
552 update_page_count(PG_LEVEL_1G, pages);
554 return last_map_addr;
557 unsigned long __meminit
558 kernel_physical_mapping_init(unsigned long start,
560 unsigned long page_size_mask)
562 bool pgd_changed = false;
563 unsigned long next, last_map_addr = end;
566 start = (unsigned long)__va(start);
567 end = (unsigned long)__va(end);
570 for (; start < end; start = next) {
571 pgd_t *pgd = pgd_offset_k(start);
572 unsigned long pud_phys;
575 next = (start + PGDIR_SIZE) & PGDIR_MASK;
580 pud = map_low_page((pud_t *)pgd_page_vaddr(*pgd));
581 last_map_addr = phys_pud_init(pud, __pa(start),
582 __pa(end), page_size_mask);
587 pud = alloc_low_page(&pud_phys);
588 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
592 spin_lock(&init_mm.page_table_lock);
593 pgd_populate(&init_mm, pgd, __va(pud_phys));
594 spin_unlock(&init_mm.page_table_lock);
599 sync_global_pgds(addr, end);
603 return last_map_addr;
607 void __init initmem_init(void)
609 memblock_x86_register_active_regions(0, 0, max_pfn);
613 void __init paging_init(void)
615 unsigned long max_zone_pfns[MAX_NR_ZONES];
617 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
618 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
619 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
620 max_zone_pfns[ZONE_NORMAL] = max_pfn;
622 sparse_memory_present_with_active_regions(MAX_NUMNODES);
626 * clear the default setting with node 0
627 * note: don't use nodes_clear here, that is really clearing when
628 * numa support is not compiled in, and later node_set_state
629 * will not set it back.
631 node_clear_state(0, N_NORMAL_MEMORY);
633 free_area_init_nodes(max_zone_pfns);
637 * Memory hotplug specific functions
639 #ifdef CONFIG_MEMORY_HOTPLUG
641 * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
644 static void update_end_of_memory_vars(u64 start, u64 size)
646 unsigned long end_pfn = PFN_UP(start + size);
648 if (end_pfn > max_pfn) {
650 max_low_pfn = end_pfn;
651 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
656 * Memory is added always to NORMAL zone. This means you will never get
657 * additional DMA/DMA32 memory.
659 int arch_add_memory(int nid, u64 start, u64 size)
661 struct pglist_data *pgdat = NODE_DATA(nid);
662 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
663 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
664 unsigned long nr_pages = size >> PAGE_SHIFT;
667 last_mapped_pfn = init_memory_mapping(start, start + size);
668 if (last_mapped_pfn > max_pfn_mapped)
669 max_pfn_mapped = last_mapped_pfn;
671 ret = __add_pages(nid, zone, start_pfn, nr_pages);
674 /* update max_pfn, max_low_pfn and high_memory */
675 update_end_of_memory_vars(start, size);
679 EXPORT_SYMBOL_GPL(arch_add_memory);
681 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
682 int memory_add_physaddr_to_nid(u64 start)
686 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
689 #endif /* CONFIG_MEMORY_HOTPLUG */
691 static struct kcore_list kcore_vsyscall;
693 void __init mem_init(void)
695 long codesize, reservedpages, datasize, initsize;
696 unsigned long absent_pages;
700 /* clear_bss() already clear the empty_zero_page */
704 /* this will put all low memory onto the freelists */
706 totalram_pages = numa_free_all_bootmem();
708 totalram_pages = free_all_bootmem();
711 absent_pages = absent_pages_in_range(0, max_pfn);
712 reservedpages = max_pfn - totalram_pages - absent_pages;
715 codesize = (unsigned long) &_etext - (unsigned long) &_text;
716 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
717 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
719 /* Register memory areas for /proc/kcore */
720 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
721 VSYSCALL_END - VSYSCALL_START, KCORE_OTHER);
723 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
724 "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
725 nr_free_pages() << (PAGE_SHIFT-10),
726 max_pfn << (PAGE_SHIFT-10),
728 absent_pages << (PAGE_SHIFT-10),
729 reservedpages << (PAGE_SHIFT-10),
734 #ifdef CONFIG_DEBUG_RODATA
735 const int rodata_test_data = 0xC3;
736 EXPORT_SYMBOL_GPL(rodata_test_data);
738 int kernel_set_to_readonly;
740 void set_kernel_text_rw(void)
742 unsigned long start = PFN_ALIGN(_text);
743 unsigned long end = PFN_ALIGN(__stop___ex_table);
745 if (!kernel_set_to_readonly)
748 pr_debug("Set kernel text: %lx - %lx for read write\n",
752 * Make the kernel identity mapping for text RW. Kernel text
753 * mapping will always be RO. Refer to the comment in
754 * static_protections() in pageattr.c
756 set_memory_rw(start, (end - start) >> PAGE_SHIFT);
759 void set_kernel_text_ro(void)
761 unsigned long start = PFN_ALIGN(_text);
762 unsigned long end = PFN_ALIGN(__stop___ex_table);
764 if (!kernel_set_to_readonly)
767 pr_debug("Set kernel text: %lx - %lx for read only\n",
771 * Set the kernel identity mapping for text RO.
773 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
776 void mark_rodata_ro(void)
778 unsigned long start = PFN_ALIGN(_text);
779 unsigned long rodata_start =
780 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
781 unsigned long end = (unsigned long) &__end_rodata_hpage_align;
782 unsigned long text_end = PAGE_ALIGN((unsigned long) &__stop___ex_table);
783 unsigned long rodata_end = PAGE_ALIGN((unsigned long) &__end_rodata);
784 unsigned long data_start = (unsigned long) &_sdata;
786 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
787 (end - start) >> 10);
788 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
790 kernel_set_to_readonly = 1;
793 * The rodata section (but not the kernel text!) should also be
796 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT);
800 #ifdef CONFIG_CPA_DEBUG
801 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
802 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
804 printk(KERN_INFO "Testing CPA: again\n");
805 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
808 free_init_pages("unused kernel memory",
809 (unsigned long) page_address(virt_to_page(text_end)),
811 page_address(virt_to_page(rodata_start)));
812 free_init_pages("unused kernel memory",
813 (unsigned long) page_address(virt_to_page(rodata_end)),
814 (unsigned long) page_address(virt_to_page(data_start)));
819 int kern_addr_valid(unsigned long addr)
821 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
827 if (above != 0 && above != -1UL)
830 pgd = pgd_offset_k(addr);
834 pud = pud_offset(pgd, addr);
838 pmd = pmd_offset(pud, addr);
843 return pfn_valid(pmd_pfn(*pmd));
845 pte = pte_offset_kernel(pmd, addr);
849 return pfn_valid(pte_pfn(*pte));
853 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
854 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
855 * not need special handling anymore:
857 static struct vm_area_struct gate_vma = {
858 .vm_start = VSYSCALL_START,
859 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
860 .vm_page_prot = PAGE_READONLY_EXEC,
861 .vm_flags = VM_READ | VM_EXEC
864 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
866 #ifdef CONFIG_IA32_EMULATION
867 if (test_tsk_thread_flag(tsk, TIF_IA32))
873 int in_gate_area(struct task_struct *task, unsigned long addr)
875 struct vm_area_struct *vma = get_gate_vma(task);
880 return (addr >= vma->vm_start) && (addr < vma->vm_end);
884 * Use this when you have no reliable task/vma, typically from interrupt
885 * context. It is less reliable than using the task's vma and may give
888 int in_gate_area_no_task(unsigned long addr)
890 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
893 const char *arch_vma_name(struct vm_area_struct *vma)
895 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
897 if (vma == &gate_vma)
903 #define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS)
905 unsigned long memory_block_size_bytes(void)
907 if (is_uv_system()) {
908 printk(KERN_INFO "UV: memory block size 2GB\n");
909 return 2UL * 1024 * 1024 * 1024;
911 return MIN_MEMORY_BLOCK_SIZE;
915 #ifdef CONFIG_SPARSEMEM_VMEMMAP
917 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
919 static long __meminitdata addr_start, addr_end;
920 static void __meminitdata *p_start, *p_end;
921 static int __meminitdata node_start;
924 vmemmap_populate(struct page *start_page, unsigned long size, int node)
926 unsigned long addr = (unsigned long)start_page;
927 unsigned long end = (unsigned long)(start_page + size);
933 for (; addr < end; addr = next) {
936 pgd = vmemmap_pgd_populate(addr, node);
940 pud = vmemmap_pud_populate(pgd, addr, node);
945 next = (addr + PAGE_SIZE) & PAGE_MASK;
946 pmd = vmemmap_pmd_populate(pud, addr, node);
951 p = vmemmap_pte_populate(pmd, addr, node);
956 addr_end = addr + PAGE_SIZE;
957 p_end = p + PAGE_SIZE;
959 next = pmd_addr_end(addr, end);
961 pmd = pmd_offset(pud, addr);
962 if (pmd_none(*pmd)) {
965 p = vmemmap_alloc_block_buf(PMD_SIZE, node);
969 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
971 set_pmd(pmd, __pmd(pte_val(entry)));
973 /* check to see if we have contiguous blocks */
974 if (p_end != p || node_start != node) {
976 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
977 addr_start, addr_end-1, p_start, p_end-1, node_start);
983 addr_end = addr + PMD_SIZE;
984 p_end = p + PMD_SIZE;
986 vmemmap_verify((pte_t *)pmd, node, addr, next);
990 sync_global_pgds((unsigned long)start_page, end);
994 void __meminit vmemmap_populate_print_last(void)
997 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
998 addr_start, addr_end-1, p_start, p_end-1, node_start);