diff options
Diffstat (limited to 'arch/x86/mm/init_64.c')
| -rw-r--r-- | arch/x86/mm/init_64.c | 750 |
1 files changed, 750 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c new file mode 100644 index 0000000..458893b --- /dev/null +++ b/arch/x86/mm/init_64.c @@ -0,0 +1,750 @@ +/* + * linux/arch/x86_64/mm/init.c + * + * Copyright (C) 1995 Linus Torvalds + * Copyright (C) 2000 Pavel Machek <pavel@suse.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/pagemap.h> +#include <linux/bootmem.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_hotplug.h> +#include <linux/nmi.h> + +#include <asm/processor.h> +#include <asm/system.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> + +#ifndef Dprintk +#define Dprintk(x...) +#endif + +const struct dma_mapping_ops* dma_ops; +EXPORT_SYMBOL(dma_ops); + +static unsigned long dma_reserve __initdata; + +DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); + +/* + * 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. + */ + +void show_mem(void) +{ + long i, total = 0, reserved = 0; + long shared = 0, cached = 0; + pg_data_t *pgdat; + struct page *page; + + printk(KERN_INFO "Mem-info:\n"); + show_free_areas(); + printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); + + for_each_online_pgdat(pgdat) { + for (i = 0; i < pgdat->node_spanned_pages; ++i) { + /* this loop can take a while with 256 GB and 4k pages + so update the NMI watchdog */ + if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) { + touch_nmi_watchdog(); + } + if (!pfn_valid(pgdat->node_start_pfn + i)) + continue; + page = pfn_to_page(pgdat->node_start_pfn + i); + total++; + if (PageReserved(page)) + reserved++; + else if (PageSwapCache(page)) + cached++; + else if (page_count(page)) + shared += page_count(page) - 1; + } + } + printk(KERN_INFO "%lu pages of RAM\n", total); + printk(KERN_INFO "%lu reserved pages\n",reserved); + printk(KERN_INFO "%lu pages shared\n",shared); + printk(KERN_INFO "%lu pages swap cached\n",cached); +} + +int after_bootmem; + +static __init void *spp_getpage(void) +{ + void *ptr; + if (after_bootmem) + ptr = (void *) get_zeroed_page(GFP_ATOMIC); + 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":""); + + Dprintk("spp_getpage %p\n", ptr); + return ptr; +} + +static __init void set_pte_phys(unsigned long vaddr, + unsigned long phys, pgprot_t prot) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte, new_pte; + + Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); + + pgd = pgd_offset_k(vaddr); + if (pgd_none(*pgd)) { + printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); + return; + } + pud = pud_offset(pgd, vaddr); + if (pud_none(*pud)) { + pmd = (pmd_t *) spp_getpage(); + set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); + if (pmd != pmd_offset(pud, 0)) { + printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); + return; + } + } + pmd = pmd_offset(pud, vaddr); + if (pmd_none(*pmd)) { + pte = (pte_t *) spp_getpage(); + set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); + if (pte != pte_offset_kernel(pmd, 0)) { + printk("PAGETABLE BUG #02!\n"); + return; + } + } + new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); + + pte = pte_offset_kernel(pmd, vaddr); + if (!pte_none(*pte) && + pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) + pte_ERROR(*pte); + set_pte(pte, new_pte); + + /* + * It's enough to flush this one mapping. + * (PGE mappings get flushed as well) + */ + __flush_tlb_one(vaddr); +} + +/* NOTE: this is meant to be run only at boot */ +void __init +__set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) +{ + unsigned long address = __fix_to_virt(idx); + + if (idx >= __end_of_fixed_addresses) { + printk("Invalid __set_fixmap\n"); + return; + } + set_pte_phys(address, phys, prot); +} + +unsigned long __meminitdata table_start, table_end; + +static __meminit void *alloc_low_page(unsigned long *phys) +{ + unsigned long pfn = table_end++; + void *adr; + + if (after_bootmem) { + adr = (void *)get_zeroed_page(GFP_ATOMIC); + *phys = __pa(adr); + return adr; + } + + if (pfn >= end_pfn) + panic("alloc_low_page: ran out of memory"); + + adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); + memset(adr, 0, PAGE_SIZE); + *phys = pfn * PAGE_SIZE; + return adr; +} + +static __meminit void unmap_low_page(void *adr) +{ + + if (after_bootmem) + return; + + early_iounmap(adr, PAGE_SIZE); +} + +/* Must run before zap_low_mappings */ +__meminit void *early_ioremap(unsigned long addr, unsigned long size) +{ + unsigned long vaddr; + pmd_t *pmd, *last_pmd; + int i, pmds; + + pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; + vaddr = __START_KERNEL_map; + pmd = level2_kernel_pgt; + last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; + for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { + for (i = 0; i < pmds; i++) { + if (pmd_present(pmd[i])) + goto next; + } + vaddr += addr & ~PMD_MASK; + addr &= PMD_MASK; + for (i = 0; i < pmds; i++, addr += PMD_SIZE) + set_pmd(pmd + i,__pmd(addr | _KERNPG_TABLE | _PAGE_PSE)); + __flush_tlb(); + return (void *)vaddr; + next: + ; + } + printk("early_ioremap(0x%lx, %lu) failed\n", addr, size); + return NULL; +} + +/* To avoid virtual aliases later */ +__meminit void early_iounmap(void *addr, unsigned long size) +{ + unsigned long vaddr; + pmd_t *pmd; + int i, pmds; + + vaddr = (unsigned long)addr; + pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; + pmd = level2_kernel_pgt + pmd_index(vaddr); + for (i = 0; i < pmds; i++) + pmd_clear(pmd + i); + __flush_tlb(); +} + +static void __meminit +phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) +{ + int i = pmd_index(address); + + for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { + unsigned long entry; + pmd_t *pmd = pmd_page + pmd_index(address); + + if (address >= end) { + if (!after_bootmem) + for (; i < PTRS_PER_PMD; i++, pmd++) + set_pmd(pmd, __pmd(0)); + break; + } + + if (pmd_val(*pmd)) + continue; + + entry = _PAGE_NX|_PAGE_PSE|_KERNPG_TABLE|_PAGE_GLOBAL|address; + entry &= __supported_pte_mask; + set_pmd(pmd, __pmd(entry)); + } +} + +static void __meminit +phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) +{ + pmd_t *pmd = pmd_offset(pud,0); + spin_lock(&init_mm.page_table_lock); + phys_pmd_init(pmd, address, end); + spin_unlock(&init_mm.page_table_lock); + __flush_tlb_all(); +} + +static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long 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; + + 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)) { + phys_pmd_update(pud, addr, end); + continue; + } + + pmd = alloc_low_page(&pmd_phys); + spin_lock(&init_mm.page_table_lock); + set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); + phys_pmd_init(pmd, addr, end); + spin_unlock(&init_mm.page_table_lock); + unmap_low_page(pmd); + } + __flush_tlb(); +} + +static void __init find_early_table_space(unsigned long end) +{ + unsigned long puds, pmds, tables, start; + + puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; + pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; + tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + + round_up(pmds * sizeof(pmd_t), PAGE_SIZE); + + /* RED-PEN putting page tables only on node 0 could + cause a hotspot and fill up ZONE_DMA. The page tables + need roughly 0.5KB per GB. */ + start = 0x8000; + table_start = find_e820_area(start, end, tables); + if (table_start == -1UL) + panic("Cannot find space for the kernel page tables"); + + table_start >>= PAGE_SHIFT; + table_end = table_start; + + early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", + end, table_start << PAGE_SHIFT, + (table_start << PAGE_SHIFT) + tables); +} + +/* Setup the direct mapping of the physical memory at PAGE_OFFSET. + This runs before bootmem is initialized and gets pages directly from the + physical memory. To access them they are temporarily mapped. */ +void __meminit init_memory_mapping(unsigned long start, unsigned long end) +{ + unsigned long next; + + Dprintk("init_memory_mapping\n"); + + /* + * Find space for the kernel direct mapping tables. + * Later we should allocate these tables in the local node of the memory + * mapped. Unfortunately this is done currently before the nodes are + * discovered. + */ + if (!after_bootmem) + find_early_table_space(end); + + start = (unsigned long)__va(start); + end = (unsigned long)__va(end); + + for (; start < end; start = next) { + unsigned long pud_phys; + pgd_t *pgd = pgd_offset_k(start); + pud_t *pud; + + if (after_bootmem) + pud = pud_offset(pgd, start & PGDIR_MASK); + else + pud = alloc_low_page(&pud_phys); + + next = start + PGDIR_SIZE; + if (next > end) + next = end; + phys_pud_init(pud, __pa(start), __pa(next)); + if (!after_bootmem) + set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); + unmap_low_page(pud); + } + + if (!after_bootmem) + mmu_cr4_features = read_cr4(); + __flush_tlb_all(); +} + +#ifndef CONFIG_NUMA +void __init paging_init(void) +{ + unsigned long max_zone_pfns[MAX_NR_ZONES]; + memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); + max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; + max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; + max_zone_pfns[ZONE_NORMAL] = end_pfn; + + memory_present(0, 0, end_pfn); + sparse_init(); + free_area_init_nodes(max_zone_pfns); +} +#endif + +/* Unmap a kernel mapping if it exists. This is useful to avoid prefetches + from the CPU leading to inconsistent cache lines. address and size + must be aligned to 2MB boundaries. + Does nothing when the mapping doesn't exist. */ +void __init clear_kernel_mapping(unsigned long address, unsigned long size) +{ + unsigned long end = address + size; + + BUG_ON(address & ~LARGE_PAGE_MASK); + BUG_ON(size & ~LARGE_PAGE_MASK); + + for (; address < end; address += LARGE_PAGE_SIZE) { + pgd_t *pgd = pgd_offset_k(address); + pud_t *pud; + pmd_t *pmd; + if (pgd_none(*pgd)) + continue; + pud = pud_offset(pgd, address); + if (pud_none(*pud)) + continue; + pmd = pmd_offset(pud, address); + if (!pmd || pmd_none(*pmd)) + continue; + if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { + /* Could handle this, but it should not happen currently. */ + printk(KERN_ERR + "clear_kernel_mapping: mapping has been split. will leak memory\n"); + pmd_ERROR(*pmd); + } + set_pmd(pmd, __pmd(0)); + } + __flush_tlb_all(); +} + +/* + * Memory hotplug specific functions + */ +void online_page(struct page *page) +{ + ClearPageReserved(page); + init_page_count(page); + __free_page(page); + totalram_pages++; + num_physpages++; +} + +#ifdef CONFIG_MEMORY_HOTPLUG +/* + * 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 start_pfn = start >> PAGE_SHIFT; + unsigned long nr_pages = size >> PAGE_SHIFT; + int ret; + + init_memory_mapping(start, (start + size -1)); + + ret = __add_pages(zone, start_pfn, nr_pages); + if (ret) + goto error; + + return ret; +error: + printk("%s: Problem encountered in __add_pages!\n", __func__); + return ret; +} +EXPORT_SYMBOL_GPL(arch_add_memory); + +int remove_memory(u64 start, u64 size) +{ + return -EINVAL; +} +EXPORT_SYMBOL_GPL(remove_memory); + +#if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) +int memory_add_physaddr_to_nid(u64 start) +{ + return 0; +} +EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); +#endif + +#endif /* CONFIG_MEMORY_HOTPLUG */ + +#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE +/* + * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance, + * just online the pages. + */ +int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages) +{ + int err = -EIO; + unsigned long pfn; + unsigned long total = 0, mem = 0; + for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) { + if (pfn_valid(pfn)) { + online_page(pfn_to_page(pfn)); + err = 0; + mem++; + } + total++; + } + if (!err) { + z->spanned_pages += total; + z->present_pages += mem; + z->zone_pgdat->node_spanned_pages += total; + z->zone_pgdat->node_present_pages += mem; + } + return err; +} +#endif + +static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, + kcore_vsyscall; + +void __init mem_init(void) +{ + long codesize, reservedpages, datasize, initsize; + + pci_iommu_alloc(); + + /* clear the zero-page */ + memset(empty_zero_page, 0, PAGE_SIZE); + + 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 + reservedpages = end_pfn - totalram_pages - + absent_pages_in_range(0, end_pfn); + + 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_mem, __va(0), max_low_pfn << PAGE_SHIFT); + kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, + VMALLOC_END-VMALLOC_START); + kclist_add(&kcore_kernel, &_stext, _end - _stext); + kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); + kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, + VSYSCALL_END - VSYSCALL_START); + + printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", + (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), + end_pfn << (PAGE_SHIFT-10), + codesize >> 10, + reservedpages << (PAGE_SHIFT-10), + datasize >> 10, + initsize >> 10); +} + +void free_init_pages(char *what, unsigned long begin, unsigned long end) +{ + unsigned long addr; + + if (begin >= end) + return; + + printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); + for (addr = begin; addr < end; addr += PAGE_SIZE) { + ClearPageReserved(virt_to_page(addr)); + init_page_count(virt_to_page(addr)); + memset((void *)(addr & ~(PAGE_SIZE-1)), + POISON_FREE_INITMEM, PAGE_SIZE); + if (addr >= __START_KERNEL_map) + change_page_attr_addr(addr, 1, __pgprot(0)); + free_page(addr); + totalram_pages++; + } + if (addr > __START_KERNEL_map) + global_flush_tlb(); +} + +void free_initmem(void) +{ + free_init_pages("unused kernel memory", + (unsigned long)(&__init_begin), + (unsigned long)(&__init_end)); +} + +#ifdef CONFIG_DEBUG_RODATA + +void mark_rodata_ro(void) +{ + unsigned long start = (unsigned long)_stext, end; + +#ifdef CONFIG_HOTPLUG_CPU + /* It must still be possible to apply SMP alternatives. */ + if (num_possible_cpus() > 1) + start = (unsigned long)_etext; +#endif + +#ifdef CONFIG_KPROBES + start = (unsigned long)__start_rodata; +#endif + + end = (unsigned long)__end_rodata; + start = (start + PAGE_SIZE - 1) & PAGE_MASK; + end &= PAGE_MASK; + if (end <= start) + return; + + change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO); + + printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", + (end - start) >> 10); + + /* + * change_page_attr_addr() requires a global_flush_tlb() call after it. + * We do this after the printk so that if something went wrong in the + * change, the printk gets out at least to give a better debug hint + * of who is the culprit. + */ + global_flush_tlb(); +} +#endif + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_init_pages("initrd memory", start, end); +} +#endif + +void __init reserve_bootmem_generic(unsigned long phys, unsigned len) +{ +#ifdef CONFIG_NUMA + int nid = phys_to_nid(phys); +#endif + unsigned long pfn = phys >> PAGE_SHIFT; + if (pfn >= end_pfn) { + /* This can happen with kdump kernels when accessing firmware + tables. */ + if (pfn < end_pfn_map) + return; + printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", + phys, len); + return; + } + + /* Should check here against the e820 map to avoid double free */ +#ifdef CONFIG_NUMA + reserve_bootmem_node(NODE_DATA(nid), phys, len); +#else + reserve_bootmem(phys, len); +#endif + if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { + dma_reserve += len / PAGE_SIZE; + set_dma_reserve(dma_reserve); + } +} + +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_SHIFT), + .vm_page_prot = PAGE_READONLY_EXEC, + .vm_flags = VM_READ | VM_EXEC +}; + +struct vm_area_struct *get_gate_vma(struct task_struct *tsk) +{ +#ifdef CONFIG_IA32_EMULATION + if (test_tsk_thread_flag(tsk, TIF_IA32)) + return NULL; +#endif + return &gate_vma; +} + +int in_gate_area(struct task_struct *task, unsigned long addr) +{ + struct vm_area_struct *vma = get_gate_vma(task); + if (!vma) + return 0; + return (addr >= vma->vm_start) && (addr < vma->vm_end); +} + +/* Use this when you have no reliable task/vma, typically from interrupt + * context. It is less reliable than using the task's vma and may give + * false positives. + */ +int in_gate_area_no_task(unsigned long addr) +{ + return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); +} + +void * __init alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size) +{ + return __alloc_bootmem_core(pgdat->bdata, size, + SMP_CACHE_BYTES, (4UL*1024*1024*1024), 0); +} + +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; +} |
