diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/mm/init_64.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/mm/init_64.c | 988 |
1 files changed, 0 insertions, 988 deletions
diff --git a/ANDROID_3.4.5/arch/x86/mm/init_64.c b/ANDROID_3.4.5/arch/x86/mm/init_64.c deleted file mode 100644 index fc18be0f..00000000 --- a/ANDROID_3.4.5/arch/x86/mm/init_64.c +++ /dev/null @@ -1,988 +0,0 @@ -/* - * linux/arch/x86_64/mm/init.c - * - * Copyright (C) 1995 Linus Torvalds - * Copyright (C) 2000 Pavel Machek <pavel@ucw.cz> - * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> - */ - -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/mman.h> -#include <linux/mm.h> -#include <linux/swap.h> -#include <linux/smp.h> -#include <linux/init.h> -#include <linux/initrd.h> -#include <linux/pagemap.h> -#include <linux/bootmem.h> -#include <linux/memblock.h> -#include <linux/proc_fs.h> -#include <linux/pci.h> -#include <linux/pfn.h> -#include <linux/poison.h> -#include <linux/dma-mapping.h> -#include <linux/module.h> -#include <linux/memory.h> -#include <linux/memory_hotplug.h> -#include <linux/nmi.h> -#include <linux/gfp.h> - -#include <asm/processor.h> -#include <asm/bios_ebda.h> -#include <asm/uaccess.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/dma.h> -#include <asm/fixmap.h> -#include <asm/e820.h> -#include <asm/apic.h> -#include <asm/tlb.h> -#include <asm/mmu_context.h> -#include <asm/proto.h> -#include <asm/smp.h> -#include <asm/sections.h> -#include <asm/kdebug.h> -#include <asm/numa.h> -#include <asm/cacheflush.h> -#include <asm/init.h> -#include <asm/uv/uv.h> -#include <asm/setup.h> - -static int __init parse_direct_gbpages_off(char *arg) -{ - direct_gbpages = 0; - return 0; -} -early_param("nogbpages", parse_direct_gbpages_off); - -static int __init parse_direct_gbpages_on(char *arg) -{ - direct_gbpages = 1; - return 0; -} -early_param("gbpages", parse_direct_gbpages_on); - -/* - * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the - * physical space so we can cache the place of the first one and move - * around without checking the pgd every time. - */ - -pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; -EXPORT_SYMBOL_GPL(__supported_pte_mask); - -int force_personality32; - -/* - * noexec32=on|off - * Control non executable heap for 32bit processes. - * To control the stack too use noexec=off - * - * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) - * off PROT_READ implies PROT_EXEC - */ -static int __init nonx32_setup(char *str) -{ - if (!strcmp(str, "on")) - force_personality32 &= ~READ_IMPLIES_EXEC; - else if (!strcmp(str, "off")) - force_personality32 |= READ_IMPLIES_EXEC; - return 1; -} -__setup("noexec32=", nonx32_setup); - -/* - * When memory was added/removed make sure all the processes MM have - * suitable PGD entries in the local PGD level page. - */ -void sync_global_pgds(unsigned long start, unsigned long end) -{ - unsigned long address; - - for (address = start; address <= end; address += PGDIR_SIZE) { - const pgd_t *pgd_ref = pgd_offset_k(address); - struct page *page; - - if (pgd_none(*pgd_ref)) - continue; - - spin_lock(&pgd_lock); - list_for_each_entry(page, &pgd_list, lru) { - pgd_t *pgd; - spinlock_t *pgt_lock; - - pgd = (pgd_t *)page_address(page) + pgd_index(address); - /* the pgt_lock only for Xen */ - pgt_lock = &pgd_page_get_mm(page)->page_table_lock; - spin_lock(pgt_lock); - - if (pgd_none(*pgd)) - set_pgd(pgd, *pgd_ref); - else - BUG_ON(pgd_page_vaddr(*pgd) - != pgd_page_vaddr(*pgd_ref)); - - spin_unlock(pgt_lock); - } - spin_unlock(&pgd_lock); - } -} - -/* - * NOTE: This function is marked __ref because it calls __init function - * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. - */ -static __ref void *spp_getpage(void) -{ - void *ptr; - - if (after_bootmem) - ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); - else - ptr = alloc_bootmem_pages(PAGE_SIZE); - - if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { - panic("set_pte_phys: cannot allocate page data %s\n", - after_bootmem ? "after bootmem" : ""); - } - - pr_debug("spp_getpage %p\n", ptr); - - return ptr; -} - -static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) -{ - if (pgd_none(*pgd)) { - pud_t *pud = (pud_t *)spp_getpage(); - pgd_populate(&init_mm, pgd, pud); - if (pud != pud_offset(pgd, 0)) - printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", - pud, pud_offset(pgd, 0)); - } - return pud_offset(pgd, vaddr); -} - -static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) -{ - if (pud_none(*pud)) { - pmd_t *pmd = (pmd_t *) spp_getpage(); - pud_populate(&init_mm, pud, pmd); - if (pmd != pmd_offset(pud, 0)) - printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", - pmd, pmd_offset(pud, 0)); - } - return pmd_offset(pud, vaddr); -} - -static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) -{ - if (pmd_none(*pmd)) { - pte_t *pte = (pte_t *) spp_getpage(); - pmd_populate_kernel(&init_mm, pmd, pte); - if (pte != pte_offset_kernel(pmd, 0)) - printk(KERN_ERR "PAGETABLE BUG #02!\n"); - } - return pte_offset_kernel(pmd, vaddr); -} - -void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) -{ - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - pud = pud_page + pud_index(vaddr); - pmd = fill_pmd(pud, vaddr); - pte = fill_pte(pmd, vaddr); - - set_pte(pte, new_pte); - - /* - * It's enough to flush this one mapping. - * (PGE mappings get flushed as well) - */ - __flush_tlb_one(vaddr); -} - -void set_pte_vaddr(unsigned long vaddr, pte_t pteval) -{ - pgd_t *pgd; - pud_t *pud_page; - - pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); - - pgd = pgd_offset_k(vaddr); - if (pgd_none(*pgd)) { - printk(KERN_ERR - "PGD FIXMAP MISSING, it should be setup in head.S!\n"); - return; - } - pud_page = (pud_t*)pgd_page_vaddr(*pgd); - set_pte_vaddr_pud(pud_page, vaddr, pteval); -} - -pmd_t * __init populate_extra_pmd(unsigned long vaddr) -{ - pgd_t *pgd; - pud_t *pud; - - pgd = pgd_offset_k(vaddr); - pud = fill_pud(pgd, vaddr); - return fill_pmd(pud, vaddr); -} - -pte_t * __init populate_extra_pte(unsigned long vaddr) -{ - pmd_t *pmd; - - pmd = populate_extra_pmd(vaddr); - return fill_pte(pmd, vaddr); -} - -/* - * Create large page table mappings for a range of physical addresses. - */ -static void __init __init_extra_mapping(unsigned long phys, unsigned long size, - pgprot_t prot) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - - BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); - for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { - pgd = pgd_offset_k((unsigned long)__va(phys)); - if (pgd_none(*pgd)) { - pud = (pud_t *) spp_getpage(); - set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | - _PAGE_USER)); - } - pud = pud_offset(pgd, (unsigned long)__va(phys)); - if (pud_none(*pud)) { - pmd = (pmd_t *) spp_getpage(); - set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | - _PAGE_USER)); - } - pmd = pmd_offset(pud, phys); - BUG_ON(!pmd_none(*pmd)); - set_pmd(pmd, __pmd(phys | pgprot_val(prot))); - } -} - -void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) -{ - __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); -} - -void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) -{ - __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); -} - -/* - * The head.S code sets up the kernel high mapping: - * - * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) - * - * phys_addr holds the negative offset to the kernel, which is added - * to the compile time generated pmds. This results in invalid pmds up - * to the point where we hit the physaddr 0 mapping. - * - * We limit the mappings to the region from _text to _brk_end. _brk_end - * is rounded up to the 2MB boundary. This catches the invalid pmds as - * well, as they are located before _text: - */ -void __init cleanup_highmap(void) -{ - unsigned long vaddr = __START_KERNEL_map; - unsigned long vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); - unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; - pmd_t *pmd = level2_kernel_pgt; - - for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { - if (pmd_none(*pmd)) - continue; - if (vaddr < (unsigned long) _text || vaddr > end) - set_pmd(pmd, __pmd(0)); - } -} - -static __ref void *alloc_low_page(unsigned long *phys) -{ - unsigned long pfn = pgt_buf_end++; - void *adr; - - if (after_bootmem) { - adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); - *phys = __pa(adr); - - return adr; - } - - if (pfn >= pgt_buf_top) - panic("alloc_low_page: ran out of memory"); - - adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE); - clear_page(adr); - *phys = pfn * PAGE_SIZE; - return adr; -} - -static __ref void *map_low_page(void *virt) -{ - void *adr; - unsigned long phys, left; - - if (after_bootmem) - return virt; - - phys = __pa(virt); - left = phys & (PAGE_SIZE - 1); - adr = early_memremap(phys & PAGE_MASK, PAGE_SIZE); - adr = (void *)(((unsigned long)adr) | left); - - return adr; -} - -static __ref void unmap_low_page(void *adr) -{ - if (after_bootmem) - return; - - early_iounmap((void *)((unsigned long)adr & PAGE_MASK), PAGE_SIZE); -} - -static unsigned long __meminit -phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, - pgprot_t prot) -{ - unsigned pages = 0; - unsigned long last_map_addr = end; - int i; - - pte_t *pte = pte_page + pte_index(addr); - - for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { - - if (addr >= end) { - if (!after_bootmem) { - for(; i < PTRS_PER_PTE; i++, pte++) - set_pte(pte, __pte(0)); - } - break; - } - - /* - * We will re-use the existing mapping. - * Xen for example has some special requirements, like mapping - * pagetable pages as RO. So assume someone who pre-setup - * these mappings are more intelligent. - */ - if (pte_val(*pte)) { - pages++; - continue; - } - - if (0) - printk(" pte=%p addr=%lx pte=%016lx\n", - pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); - pages++; - set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); - last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; - } - - update_page_count(PG_LEVEL_4K, pages); - - return last_map_addr; -} - -static unsigned long __meminit -phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, - unsigned long page_size_mask, pgprot_t prot) -{ - unsigned long pages = 0; - unsigned long last_map_addr = end; - - int i = pmd_index(address); - - for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { - unsigned long pte_phys; - pmd_t *pmd = pmd_page + pmd_index(address); - pte_t *pte; - pgprot_t new_prot = prot; - - if (address >= end) { - if (!after_bootmem) { - for (; i < PTRS_PER_PMD; i++, pmd++) - set_pmd(pmd, __pmd(0)); - } - break; - } - - if (pmd_val(*pmd)) { - if (!pmd_large(*pmd)) { - spin_lock(&init_mm.page_table_lock); - pte = map_low_page((pte_t *)pmd_page_vaddr(*pmd)); - last_map_addr = phys_pte_init(pte, address, - end, prot); - unmap_low_page(pte); - spin_unlock(&init_mm.page_table_lock); - continue; - } - /* - * If we are ok with PG_LEVEL_2M mapping, then we will - * use the existing mapping, - * - * Otherwise, we will split the large page mapping but - * use the same existing protection bits except for - * large page, so that we don't violate Intel's TLB - * Application note (317080) which says, while changing - * the page sizes, new and old translations should - * not differ with respect to page frame and - * attributes. - */ - if (page_size_mask & (1 << PG_LEVEL_2M)) { - pages++; - continue; - } - new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); - } - - if (page_size_mask & (1<<PG_LEVEL_2M)) { - pages++; - spin_lock(&init_mm.page_table_lock); - set_pte((pte_t *)pmd, - pfn_pte(address >> PAGE_SHIFT, - __pgprot(pgprot_val(prot) | _PAGE_PSE))); - spin_unlock(&init_mm.page_table_lock); - last_map_addr = (address & PMD_MASK) + PMD_SIZE; - continue; - } - - pte = alloc_low_page(&pte_phys); - last_map_addr = phys_pte_init(pte, address, end, new_prot); - unmap_low_page(pte); - - spin_lock(&init_mm.page_table_lock); - pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); - spin_unlock(&init_mm.page_table_lock); - } - update_page_count(PG_LEVEL_2M, pages); - return last_map_addr; -} - -static unsigned long __meminit -phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, - unsigned long page_size_mask) -{ - unsigned long pages = 0; - unsigned long last_map_addr = end; - int i = pud_index(addr); - - for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { - unsigned long pmd_phys; - pud_t *pud = pud_page + pud_index(addr); - pmd_t *pmd; - pgprot_t prot = PAGE_KERNEL; - - if (addr >= end) - break; - - if (!after_bootmem && - !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { - set_pud(pud, __pud(0)); - continue; - } - - if (pud_val(*pud)) { - if (!pud_large(*pud)) { - pmd = map_low_page(pmd_offset(pud, 0)); - last_map_addr = phys_pmd_init(pmd, addr, end, - page_size_mask, prot); - unmap_low_page(pmd); - __flush_tlb_all(); - continue; - } - /* - * If we are ok with PG_LEVEL_1G mapping, then we will - * use the existing mapping. - * - * Otherwise, we will split the gbpage mapping but use - * the same existing protection bits except for large - * page, so that we don't violate Intel's TLB - * Application note (317080) which says, while changing - * the page sizes, new and old translations should - * not differ with respect to page frame and - * attributes. - */ - if (page_size_mask & (1 << PG_LEVEL_1G)) { - pages++; - continue; - } - prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); - } - - if (page_size_mask & (1<<PG_LEVEL_1G)) { - pages++; - spin_lock(&init_mm.page_table_lock); - set_pte((pte_t *)pud, - pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); - spin_unlock(&init_mm.page_table_lock); - last_map_addr = (addr & PUD_MASK) + PUD_SIZE; - continue; - } - - pmd = alloc_low_page(&pmd_phys); - last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, - prot); - unmap_low_page(pmd); - - spin_lock(&init_mm.page_table_lock); - pud_populate(&init_mm, pud, __va(pmd_phys)); - spin_unlock(&init_mm.page_table_lock); - } - __flush_tlb_all(); - - update_page_count(PG_LEVEL_1G, pages); - - return last_map_addr; -} - -unsigned long __meminit -kernel_physical_mapping_init(unsigned long start, - unsigned long end, - unsigned long page_size_mask) -{ - bool pgd_changed = false; - unsigned long next, last_map_addr = end; - unsigned long addr; - - start = (unsigned long)__va(start); - end = (unsigned long)__va(end); - addr = start; - - for (; start < end; start = next) { - pgd_t *pgd = pgd_offset_k(start); - unsigned long pud_phys; - pud_t *pud; - - next = (start + PGDIR_SIZE) & PGDIR_MASK; - if (next > end) - next = end; - - if (pgd_val(*pgd)) { - pud = map_low_page((pud_t *)pgd_page_vaddr(*pgd)); - last_map_addr = phys_pud_init(pud, __pa(start), - __pa(end), page_size_mask); - unmap_low_page(pud); - continue; - } - - pud = alloc_low_page(&pud_phys); - last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), - page_size_mask); - unmap_low_page(pud); - - spin_lock(&init_mm.page_table_lock); - pgd_populate(&init_mm, pgd, __va(pud_phys)); - spin_unlock(&init_mm.page_table_lock); - pgd_changed = true; - } - - if (pgd_changed) - sync_global_pgds(addr, end); - - __flush_tlb_all(); - - return last_map_addr; -} - -#ifndef CONFIG_NUMA -void __init initmem_init(void) -{ - memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0); -} -#endif - -void __init paging_init(void) -{ - sparse_memory_present_with_active_regions(MAX_NUMNODES); - sparse_init(); - - /* - * clear the default setting with node 0 - * note: don't use nodes_clear here, that is really clearing when - * numa support is not compiled in, and later node_set_state - * will not set it back. - */ - node_clear_state(0, N_NORMAL_MEMORY); - - zone_sizes_init(); -} - -/* - * Memory hotplug specific functions - */ -#ifdef CONFIG_MEMORY_HOTPLUG -/* - * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need - * updating. - */ -static void update_end_of_memory_vars(u64 start, u64 size) -{ - unsigned long end_pfn = PFN_UP(start + size); - - if (end_pfn > max_pfn) { - max_pfn = end_pfn; - max_low_pfn = end_pfn; - high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; - } -} - -/* - * Memory is added always to NORMAL zone. This means you will never get - * additional DMA/DMA32 memory. - */ -int arch_add_memory(int nid, u64 start, u64 size) -{ - struct pglist_data *pgdat = NODE_DATA(nid); - struct zone *zone = pgdat->node_zones + ZONE_NORMAL; - unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; - unsigned long nr_pages = size >> PAGE_SHIFT; - int ret; - - last_mapped_pfn = init_memory_mapping(start, start + size); - if (last_mapped_pfn > max_pfn_mapped) - max_pfn_mapped = last_mapped_pfn; - - ret = __add_pages(nid, zone, start_pfn, nr_pages); - WARN_ON_ONCE(ret); - - /* update max_pfn, max_low_pfn and high_memory */ - update_end_of_memory_vars(start, size); - - return ret; -} -EXPORT_SYMBOL_GPL(arch_add_memory); - -#endif /* CONFIG_MEMORY_HOTPLUG */ - -static struct kcore_list kcore_vsyscall; - -void __init mem_init(void) -{ - long codesize, reservedpages, datasize, initsize; - unsigned long absent_pages; - - pci_iommu_alloc(); - - /* clear_bss() already clear the empty_zero_page */ - - reservedpages = 0; - - /* this will put all low memory onto the freelists */ -#ifdef CONFIG_NUMA - totalram_pages = numa_free_all_bootmem(); -#else - totalram_pages = free_all_bootmem(); -#endif - - absent_pages = absent_pages_in_range(0, max_pfn); - reservedpages = max_pfn - totalram_pages - absent_pages; - after_bootmem = 1; - - codesize = (unsigned long) &_etext - (unsigned long) &_text; - datasize = (unsigned long) &_edata - (unsigned long) &_etext; - initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; - - /* Register memory areas for /proc/kcore */ - kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, - VSYSCALL_END - VSYSCALL_START, KCORE_OTHER); - - printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " - "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n", - nr_free_pages() << (PAGE_SHIFT-10), - max_pfn << (PAGE_SHIFT-10), - codesize >> 10, - absent_pages << (PAGE_SHIFT-10), - reservedpages << (PAGE_SHIFT-10), - datasize >> 10, - initsize >> 10); -} - -#ifdef CONFIG_DEBUG_RODATA -const int rodata_test_data = 0xC3; -EXPORT_SYMBOL_GPL(rodata_test_data); - -int kernel_set_to_readonly; - -void set_kernel_text_rw(void) -{ - unsigned long start = PFN_ALIGN(_text); - unsigned long end = PFN_ALIGN(__stop___ex_table); - - if (!kernel_set_to_readonly) - return; - - pr_debug("Set kernel text: %lx - %lx for read write\n", - start, end); - - /* - * Make the kernel identity mapping for text RW. Kernel text - * mapping will always be RO. Refer to the comment in - * static_protections() in pageattr.c - */ - set_memory_rw(start, (end - start) >> PAGE_SHIFT); -} - -void set_kernel_text_ro(void) -{ - unsigned long start = PFN_ALIGN(_text); - unsigned long end = PFN_ALIGN(__stop___ex_table); - - if (!kernel_set_to_readonly) - return; - - pr_debug("Set kernel text: %lx - %lx for read only\n", - start, end); - - /* - * Set the kernel identity mapping for text RO. - */ - set_memory_ro(start, (end - start) >> PAGE_SHIFT); -} - -void mark_rodata_ro(void) -{ - unsigned long start = PFN_ALIGN(_text); - unsigned long rodata_start = - ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; - unsigned long end = (unsigned long) &__end_rodata_hpage_align; - unsigned long text_end = PAGE_ALIGN((unsigned long) &__stop___ex_table); - unsigned long rodata_end = PAGE_ALIGN((unsigned long) &__end_rodata); - unsigned long data_start = (unsigned long) &_sdata; - - printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", - (end - start) >> 10); - set_memory_ro(start, (end - start) >> PAGE_SHIFT); - - kernel_set_to_readonly = 1; - - /* - * The rodata section (but not the kernel text!) should also be - * not-executable. - */ - set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); - - rodata_test(); - -#ifdef CONFIG_CPA_DEBUG - printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); - set_memory_rw(start, (end-start) >> PAGE_SHIFT); - - printk(KERN_INFO "Testing CPA: again\n"); - set_memory_ro(start, (end-start) >> PAGE_SHIFT); -#endif - - free_init_pages("unused kernel memory", - (unsigned long) page_address(virt_to_page(text_end)), - (unsigned long) - page_address(virt_to_page(rodata_start))); - free_init_pages("unused kernel memory", - (unsigned long) page_address(virt_to_page(rodata_end)), - (unsigned long) page_address(virt_to_page(data_start))); -} - -#endif - -int kern_addr_valid(unsigned long addr) -{ - unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - if (above != 0 && above != -1UL) - return 0; - - pgd = pgd_offset_k(addr); - if (pgd_none(*pgd)) - return 0; - - pud = pud_offset(pgd, addr); - if (pud_none(*pud)) - return 0; - - pmd = pmd_offset(pud, addr); - if (pmd_none(*pmd)) - return 0; - - if (pmd_large(*pmd)) - return pfn_valid(pmd_pfn(*pmd)); - - pte = pte_offset_kernel(pmd, addr); - if (pte_none(*pte)) - return 0; - - return pfn_valid(pte_pfn(*pte)); -} - -/* - * A pseudo VMA to allow ptrace access for the vsyscall page. This only - * covers the 64bit vsyscall page now. 32bit has a real VMA now and does - * not need special handling anymore: - */ -static struct vm_area_struct gate_vma = { - .vm_start = VSYSCALL_START, - .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), - .vm_page_prot = PAGE_READONLY_EXEC, - .vm_flags = VM_READ | VM_EXEC -}; - -struct vm_area_struct *get_gate_vma(struct mm_struct *mm) -{ -#ifdef CONFIG_IA32_EMULATION - if (!mm || mm->context.ia32_compat) - return NULL; -#endif - return &gate_vma; -} - -int in_gate_area(struct mm_struct *mm, unsigned long addr) -{ - struct vm_area_struct *vma = get_gate_vma(mm); - - if (!vma) - return 0; - - return (addr >= vma->vm_start) && (addr < vma->vm_end); -} - -/* - * Use this when you have no reliable mm, typically from interrupt - * context. It is less reliable than using a task's mm and may give - * false positives. - */ -int in_gate_area_no_mm(unsigned long addr) -{ - return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); -} - -const char *arch_vma_name(struct vm_area_struct *vma) -{ - if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) - return "[vdso]"; - if (vma == &gate_vma) - return "[vsyscall]"; - return NULL; -} - -#ifdef CONFIG_X86_UV -unsigned long memory_block_size_bytes(void) -{ - if (is_uv_system()) { - printk(KERN_INFO "UV: memory block size 2GB\n"); - return 2UL * 1024 * 1024 * 1024; - } - return MIN_MEMORY_BLOCK_SIZE; -} -#endif - -#ifdef CONFIG_SPARSEMEM_VMEMMAP -/* - * Initialise the sparsemem vmemmap using huge-pages at the PMD level. - */ -static long __meminitdata addr_start, addr_end; -static void __meminitdata *p_start, *p_end; -static int __meminitdata node_start; - -int __meminit -vmemmap_populate(struct page *start_page, unsigned long size, int node) -{ - unsigned long addr = (unsigned long)start_page; - unsigned long end = (unsigned long)(start_page + size); - unsigned long next; - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - - for (; addr < end; addr = next) { - void *p = NULL; - - pgd = vmemmap_pgd_populate(addr, node); - if (!pgd) - return -ENOMEM; - - pud = vmemmap_pud_populate(pgd, addr, node); - if (!pud) - return -ENOMEM; - - if (!cpu_has_pse) { - next = (addr + PAGE_SIZE) & PAGE_MASK; - pmd = vmemmap_pmd_populate(pud, addr, node); - - if (!pmd) - return -ENOMEM; - - p = vmemmap_pte_populate(pmd, addr, node); - - if (!p) - return -ENOMEM; - - addr_end = addr + PAGE_SIZE; - p_end = p + PAGE_SIZE; - } else { - next = pmd_addr_end(addr, end); - - pmd = pmd_offset(pud, addr); - if (pmd_none(*pmd)) { - pte_t entry; - - p = vmemmap_alloc_block_buf(PMD_SIZE, node); - if (!p) - return -ENOMEM; - - entry = pfn_pte(__pa(p) >> PAGE_SHIFT, - PAGE_KERNEL_LARGE); - set_pmd(pmd, __pmd(pte_val(entry))); - - /* check to see if we have contiguous blocks */ - if (p_end != p || node_start != node) { - if (p_start) - printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", - addr_start, addr_end-1, p_start, p_end-1, node_start); - addr_start = addr; - node_start = node; - p_start = p; - } - - addr_end = addr + PMD_SIZE; - p_end = p + PMD_SIZE; - } else - vmemmap_verify((pte_t *)pmd, node, addr, next); - } - - } - sync_global_pgds((unsigned long)start_page, end); - return 0; -} - -void __meminit vmemmap_populate_print_last(void) -{ - if (p_start) { - printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", - addr_start, addr_end-1, p_start, p_end-1, node_start); - p_start = NULL; - p_end = NULL; - node_start = 0; - } -} -#endif |