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/system.h>
35 #include <asm/uaccess.h>
36 #include <asm/pgtable.h>
37 #include <asm/pgalloc.h>
39 #include <asm/fixmap.h>
43 #include <asm/mmu_context.h>
44 #include <asm/proto.h>
46 #include <asm/sections.h>
47 #include <asm/kdebug.h>
49 #include <asm/cacheflush.h>
52 * PFN of last memory page.
54 unsigned long end_pfn;
57 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
58 * The direct mapping extends to max_pfn_mapped, so that we can directly access
59 * apertures, ACPI and other tables without having to play with fixmaps.
61 unsigned long max_pfn_mapped;
63 static unsigned long dma_reserve __initdata;
65 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
67 int direct_gbpages __meminitdata
68 #ifdef CONFIG_DIRECT_GBPAGES
73 static int __init parse_direct_gbpages_off(char *arg)
78 early_param("nogbpages", parse_direct_gbpages_off);
80 static int __init parse_direct_gbpages_on(char *arg)
85 early_param("gbpages", parse_direct_gbpages_on);
88 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
89 * physical space so we can cache the place of the first one and move
90 * around without checking the pgd every time.
95 long i, total = 0, reserved = 0;
96 long shared = 0, cached = 0;
100 printk(KERN_INFO "Mem-info:\n");
102 for_each_online_pgdat(pgdat) {
103 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
105 * This loop can take a while with 256 GB and
106 * 4k pages so defer the NMI watchdog:
108 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
109 touch_nmi_watchdog();
111 if (!pfn_valid(pgdat->node_start_pfn + i))
114 page = pfn_to_page(pgdat->node_start_pfn + i);
116 if (PageReserved(page))
118 else if (PageSwapCache(page))
120 else if (page_count(page))
121 shared += page_count(page) - 1;
124 printk(KERN_INFO "%lu pages of RAM\n", total);
125 printk(KERN_INFO "%lu reserved pages\n", reserved);
126 printk(KERN_INFO "%lu pages shared\n", shared);
127 printk(KERN_INFO "%lu pages swap cached\n", cached);
132 static __init void *spp_getpage(void)
137 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
139 ptr = alloc_bootmem_pages(PAGE_SIZE);
141 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
142 panic("set_pte_phys: cannot allocate page data %s\n",
143 after_bootmem ? "after bootmem" : "");
146 pr_debug("spp_getpage %p\n", ptr);
152 set_pte_vaddr(unsigned long vaddr, pte_t new_pte)
159 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(new_pte));
161 pgd = pgd_offset_k(vaddr);
162 if (pgd_none(*pgd)) {
164 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
167 pud = pud_offset(pgd, vaddr);
168 if (pud_none(*pud)) {
169 pmd = (pmd_t *) spp_getpage();
170 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
171 if (pmd != pmd_offset(pud, 0)) {
172 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
173 pmd, pmd_offset(pud, 0));
177 pmd = pmd_offset(pud, vaddr);
178 if (pmd_none(*pmd)) {
179 pte = (pte_t *) spp_getpage();
180 set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
181 if (pte != pte_offset_kernel(pmd, 0)) {
182 printk(KERN_ERR "PAGETABLE BUG #02!\n");
187 pte = pte_offset_kernel(pmd, vaddr);
188 if (!pte_none(*pte) && pte_val(new_pte) &&
189 pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
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 * The head.S code sets up the kernel high mapping:
203 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
205 * phys_addr holds the negative offset to the kernel, which is added
206 * to the compile time generated pmds. This results in invalid pmds up
207 * to the point where we hit the physaddr 0 mapping.
209 * We limit the mappings to the region from _text to _end. _end is
210 * rounded up to the 2MB boundary. This catches the invalid pmds as
211 * well, as they are located before _text:
213 void __init cleanup_highmap(void)
215 unsigned long vaddr = __START_KERNEL_map;
216 unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1;
217 pmd_t *pmd = level2_kernel_pgt;
218 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
220 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
223 if (vaddr < (unsigned long) _text || vaddr > end)
224 set_pmd(pmd, __pmd(0));
228 static unsigned long __initdata table_start;
229 static unsigned long __meminitdata table_end;
231 static __meminit void *alloc_low_page(unsigned long *phys)
233 unsigned long pfn = table_end++;
237 adr = (void *)get_zeroed_page(GFP_ATOMIC);
244 panic("alloc_low_page: ran out of memory");
246 adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
247 memset(adr, 0, PAGE_SIZE);
248 *phys = pfn * PAGE_SIZE;
252 static __meminit void unmap_low_page(void *adr)
257 early_iounmap(adr, PAGE_SIZE);
260 /* Must run before zap_low_mappings */
261 __meminit void *early_ioremap(unsigned long addr, unsigned long size)
263 pmd_t *pmd, *last_pmd;
267 pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
268 vaddr = __START_KERNEL_map;
269 pmd = level2_kernel_pgt;
270 last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1;
272 for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) {
273 for (i = 0; i < pmds; i++) {
274 if (pmd_present(pmd[i]))
275 goto continue_outer_loop;
277 vaddr += addr & ~PMD_MASK;
280 for (i = 0; i < pmds; i++, addr += PMD_SIZE)
281 set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
284 return (void *)vaddr;
288 printk(KERN_ERR "early_ioremap(0x%lx, %lu) failed\n", addr, size);
294 * To avoid virtual aliases later:
296 __meminit void early_iounmap(void *addr, unsigned long size)
302 vaddr = (unsigned long)addr;
303 pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
304 pmd = level2_kernel_pgt + pmd_index(vaddr);
306 for (i = 0; i < pmds; i++)
312 static unsigned long __meminit
313 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
315 unsigned long pages = 0;
317 int i = pmd_index(address);
319 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
320 pmd_t *pmd = pmd_page + pmd_index(address);
322 if (address >= end) {
323 if (!after_bootmem) {
324 for (; i < PTRS_PER_PMD; i++, pmd++)
325 set_pmd(pmd, __pmd(0));
334 set_pte((pte_t *)pmd,
335 pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
337 update_page_count(PG_LEVEL_2M, pages);
341 static unsigned long __meminit
342 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
344 pmd_t *pmd = pmd_offset(pud, 0);
345 unsigned long last_map_addr;
347 spin_lock(&init_mm.page_table_lock);
348 last_map_addr = phys_pmd_init(pmd, address, end);
349 spin_unlock(&init_mm.page_table_lock);
351 return last_map_addr;
354 static unsigned long __meminit
355 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
357 unsigned long pages = 0;
358 unsigned long last_map_addr = end;
359 int i = pud_index(addr);
361 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
362 unsigned long pmd_phys;
363 pud_t *pud = pud_page + pud_index(addr);
369 if (!after_bootmem &&
370 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
371 set_pud(pud, __pud(0));
376 if (!pud_large(*pud))
377 last_map_addr = phys_pmd_update(pud, addr, end);
381 if (direct_gbpages) {
383 set_pte((pte_t *)pud,
384 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
385 last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
389 pmd = alloc_low_page(&pmd_phys);
391 spin_lock(&init_mm.page_table_lock);
392 set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
393 last_map_addr = phys_pmd_init(pmd, addr, end);
394 spin_unlock(&init_mm.page_table_lock);
399 update_page_count(PG_LEVEL_1G, pages);
401 return last_map_addr >> PAGE_SHIFT;
404 static void __init find_early_table_space(unsigned long end)
406 unsigned long puds, pmds, tables, start;
408 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
409 tables = round_up(puds * sizeof(pud_t), PAGE_SIZE);
410 if (!direct_gbpages) {
411 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
412 tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
416 * RED-PEN putting page tables only on node 0 could
417 * cause a hotspot and fill up ZONE_DMA. The page tables
418 * need roughly 0.5KB per GB.
421 table_start = find_e820_area(start, end, tables, PAGE_SIZE);
422 if (table_start == -1UL)
423 panic("Cannot find space for the kernel page tables");
425 table_start >>= PAGE_SHIFT;
426 table_end = table_start;
428 early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n",
429 end, table_start << PAGE_SHIFT,
430 (table_start << PAGE_SHIFT) + tables);
433 static void __init init_gbpages(void)
435 if (direct_gbpages && cpu_has_gbpages)
436 printk(KERN_INFO "Using GB pages for direct mapping\n");
441 #ifdef CONFIG_MEMTEST
443 static void __init memtest(unsigned long start_phys, unsigned long size,
447 unsigned long *start;
448 unsigned long start_bad;
449 unsigned long last_bad;
451 unsigned long start_phys_aligned;
463 val = 0x5555555555555555UL;
466 val = 0xaaaaaaaaaaaaaaaaUL;
472 incr = sizeof(unsigned long);
473 start_phys_aligned = ALIGN(start_phys, incr);
474 count = (size - (start_phys_aligned - start_phys))/incr;
475 start = __va(start_phys_aligned);
479 for (i = 0; i < count; i++)
481 for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
483 if (start_phys_aligned == last_bad + incr) {
487 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved",
488 val, start_bad, last_bad + incr);
489 reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
491 start_bad = last_bad = start_phys_aligned;
496 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved",
497 val, start_bad, last_bad + incr);
498 reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
503 /* default is disabled */
504 static int memtest_pattern __initdata;
506 static int __init parse_memtest(char *arg)
509 memtest_pattern = simple_strtoul(arg, NULL, 0);
513 early_param("memtest", parse_memtest);
515 static void __init early_memtest(unsigned long start, unsigned long end)
520 if (!memtest_pattern)
523 printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
524 for (pattern = 0; pattern < memtest_pattern; pattern++) {
527 while (t_start < end) {
528 t_start = find_e820_area_size(t_start, &t_size, 1);
533 if (t_start + t_size > end)
534 t_size = end - t_start;
536 printk(KERN_CONT "\n %016llx - %016llx pattern %d",
537 (unsigned long long)t_start,
538 (unsigned long long)t_start + t_size, pattern);
540 memtest(t_start, t_size, pattern);
545 printk(KERN_CONT "\n");
548 static void __init early_memtest(unsigned long start, unsigned long end)
554 * Setup the direct mapping of the physical memory at PAGE_OFFSET.
555 * This runs before bootmem is initialized and gets pages directly from
556 * the physical memory. To access them they are temporarily mapped.
558 unsigned long __init_refok init_memory_mapping(unsigned long start, unsigned long end)
560 unsigned long next, last_map_addr = end;
561 unsigned long start_phys = start, end_phys = end;
563 printk(KERN_INFO "init_memory_mapping\n");
566 * Find space for the kernel direct mapping tables.
568 * Later we should allocate these tables in the local node of the
569 * memory mapped. Unfortunately this is done currently before the
570 * nodes are discovered.
572 if (!after_bootmem) {
574 find_early_table_space(end);
577 start = (unsigned long)__va(start);
578 end = (unsigned long)__va(end);
580 for (; start < end; start = next) {
581 pgd_t *pgd = pgd_offset_k(start);
582 unsigned long pud_phys;
586 pud = pud_offset(pgd, start & PGDIR_MASK);
588 pud = alloc_low_page(&pud_phys);
590 next = start + PGDIR_SIZE;
593 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next));
595 set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
600 mmu_cr4_features = read_cr4();
604 reserve_early(table_start << PAGE_SHIFT,
605 table_end << PAGE_SHIFT, "PGTABLE");
608 early_memtest(start_phys, end_phys);
610 return last_map_addr;
614 void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
616 unsigned long bootmap_size, bootmap;
618 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
619 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
622 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
623 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
624 e820_register_active_regions(0, start_pfn, end_pfn);
625 free_bootmem_with_active_regions(0, end_pfn);
626 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
627 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
630 void __init paging_init(void)
632 unsigned long max_zone_pfns[MAX_NR_ZONES];
634 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
635 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
636 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
637 max_zone_pfns[ZONE_NORMAL] = end_pfn;
639 memory_present(0, 0, end_pfn);
641 free_area_init_nodes(max_zone_pfns);
646 * Memory hotplug specific functions
648 #ifdef CONFIG_MEMORY_HOTPLUG
650 * Memory is added always to NORMAL zone. This means you will never get
651 * additional DMA/DMA32 memory.
653 int arch_add_memory(int nid, u64 start, u64 size)
655 struct pglist_data *pgdat = NODE_DATA(nid);
656 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
657 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
658 unsigned long nr_pages = size >> PAGE_SHIFT;
661 last_mapped_pfn = init_memory_mapping(start, start + size-1);
662 if (last_mapped_pfn > max_pfn_mapped)
663 max_pfn_mapped = last_mapped_pfn;
665 ret = __add_pages(zone, start_pfn, nr_pages);
670 EXPORT_SYMBOL_GPL(arch_add_memory);
672 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
673 int memory_add_physaddr_to_nid(u64 start)
677 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
680 #endif /* CONFIG_MEMORY_HOTPLUG */
683 * devmem_is_allowed() checks to see if /dev/mem access to a certain address
684 * is valid. The argument is a physical page number.
687 * On x86, access has to be given to the first megabyte of ram because that area
688 * contains bios code and data regions used by X and dosemu and similar apps.
689 * Access has to be given to non-kernel-ram areas as well, these contain the PCI
690 * mmio resources as well as potential bios/acpi data regions.
692 int devmem_is_allowed(unsigned long pagenr)
696 if (!page_is_ram(pagenr))
702 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
703 kcore_modules, kcore_vsyscall;
705 void __init mem_init(void)
707 long codesize, reservedpages, datasize, initsize;
711 /* clear_bss() already clear the empty_zero_page */
715 /* this will put all low memory onto the freelists */
717 totalram_pages = numa_free_all_bootmem();
719 totalram_pages = free_all_bootmem();
721 reservedpages = end_pfn - totalram_pages -
722 absent_pages_in_range(0, end_pfn);
725 codesize = (unsigned long) &_etext - (unsigned long) &_text;
726 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
727 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
729 /* Register memory areas for /proc/kcore */
730 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
731 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
732 VMALLOC_END-VMALLOC_START);
733 kclist_add(&kcore_kernel, &_stext, _end - _stext);
734 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
735 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
736 VSYSCALL_END - VSYSCALL_START);
738 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
739 "%ldk reserved, %ldk data, %ldk init)\n",
740 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
741 end_pfn << (PAGE_SHIFT-10),
743 reservedpages << (PAGE_SHIFT-10),
750 void free_init_pages(char *what, unsigned long begin, unsigned long end)
752 unsigned long addr = begin;
758 * If debugging page accesses then do not free this memory but
759 * mark them not present - any buggy init-section access will
760 * create a kernel page fault:
762 #ifdef CONFIG_DEBUG_PAGEALLOC
763 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
764 begin, PAGE_ALIGN(end));
765 set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
767 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
769 for (; addr < end; addr += PAGE_SIZE) {
770 ClearPageReserved(virt_to_page(addr));
771 init_page_count(virt_to_page(addr));
772 memset((void *)(addr & ~(PAGE_SIZE-1)),
773 POISON_FREE_INITMEM, PAGE_SIZE);
780 void free_initmem(void)
782 free_init_pages("unused kernel memory",
783 (unsigned long)(&__init_begin),
784 (unsigned long)(&__init_end));
787 #ifdef CONFIG_DEBUG_RODATA
788 const int rodata_test_data = 0xC3;
789 EXPORT_SYMBOL_GPL(rodata_test_data);
791 void mark_rodata_ro(void)
793 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
795 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
796 (end - start) >> 10);
797 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
800 * The rodata section (but not the kernel text!) should also be
803 start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
804 set_memory_nx(start, (end - start) >> PAGE_SHIFT);
808 #ifdef CONFIG_CPA_DEBUG
809 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
810 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
812 printk(KERN_INFO "Testing CPA: again\n");
813 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
819 #ifdef CONFIG_BLK_DEV_INITRD
820 void free_initrd_mem(unsigned long start, unsigned long end)
822 free_init_pages("initrd memory", start, end);
826 int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
832 unsigned long pfn = phys >> PAGE_SHIFT;
835 if (pfn >= end_pfn) {
837 * This can happen with kdump kernels when accessing
840 if (pfn < max_pfn_mapped)
843 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",
848 /* Should check here against the e820 map to avoid double free */
850 nid = phys_to_nid(phys);
851 next_nid = phys_to_nid(phys + len - 1);
853 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags);
855 ret = reserve_bootmem(phys, len, flags);
861 reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
864 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
865 dma_reserve += len / PAGE_SIZE;
866 set_dma_reserve(dma_reserve);
872 int kern_addr_valid(unsigned long addr)
874 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
880 if (above != 0 && above != -1UL)
883 pgd = pgd_offset_k(addr);
887 pud = pud_offset(pgd, addr);
891 pmd = pmd_offset(pud, addr);
896 return pfn_valid(pmd_pfn(*pmd));
898 pte = pte_offset_kernel(pmd, addr);
902 return pfn_valid(pte_pfn(*pte));
906 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
907 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
908 * not need special handling anymore:
910 static struct vm_area_struct gate_vma = {
911 .vm_start = VSYSCALL_START,
912 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
913 .vm_page_prot = PAGE_READONLY_EXEC,
914 .vm_flags = VM_READ | VM_EXEC
917 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
919 #ifdef CONFIG_IA32_EMULATION
920 if (test_tsk_thread_flag(tsk, TIF_IA32))
926 int in_gate_area(struct task_struct *task, unsigned long addr)
928 struct vm_area_struct *vma = get_gate_vma(task);
933 return (addr >= vma->vm_start) && (addr < vma->vm_end);
937 * Use this when you have no reliable task/vma, typically from interrupt
938 * context. It is less reliable than using the task's vma and may give
941 int in_gate_area_no_task(unsigned long addr)
943 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
946 const char *arch_vma_name(struct vm_area_struct *vma)
948 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
950 if (vma == &gate_vma)
955 #ifdef CONFIG_SPARSEMEM_VMEMMAP
957 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
959 static long __meminitdata addr_start, addr_end;
960 static void __meminitdata *p_start, *p_end;
961 static int __meminitdata node_start;
964 vmemmap_populate(struct page *start_page, unsigned long size, int node)
966 unsigned long addr = (unsigned long)start_page;
967 unsigned long end = (unsigned long)(start_page + size);
973 for (; addr < end; addr = next) {
974 next = pmd_addr_end(addr, end);
976 pgd = vmemmap_pgd_populate(addr, node);
980 pud = vmemmap_pud_populate(pgd, addr, node);
984 pmd = pmd_offset(pud, addr);
985 if (pmd_none(*pmd)) {
989 p = vmemmap_alloc_block(PMD_SIZE, node);
993 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
995 set_pmd(pmd, __pmd(pte_val(entry)));
997 /* check to see if we have contiguous blocks */
998 if (p_end != p || node_start != node) {
1000 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1001 addr_start, addr_end-1, p_start, p_end-1, node_start);
1006 addr_end = addr + PMD_SIZE;
1007 p_end = p + PMD_SIZE;
1009 vmemmap_verify((pte_t *)pmd, node, addr, next);
1015 void __meminit vmemmap_populate_print_last(void)
1018 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1019 addr_start, addr_end-1, p_start, p_end-1, node_start);