diff options
Diffstat (limited to 'arch/x86_64/mm/init.c')
| -rw-r--r-- | arch/x86_64/mm/init.c | 745 |
1 files changed, 0 insertions, 745 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c deleted file mode 100644 index 7af1742aa95..00000000000 --- a/arch/x86_64/mm/init.c +++ /dev/null @@ -1,745 +0,0 @@ -/* - * 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/config.h> -#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/dma-mapping.h> -#include <linux/module.h> -#include <linux/memory_hotplug.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> -#include <asm/dma-mapping.h> -#include <asm/swiotlb.h> - -#ifndef Dprintk -#define Dprintk(x...) -#endif - -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_pgdat(pgdat) { - for (i = 0; i < pgdat->node_spanned_pages; ++i) { - 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); -} - -/* References to section boundaries */ - -int after_bootmem; - -static 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 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 __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 __initdata table_start, table_end; - -extern pmd_t temp_boot_pmds[]; - -static struct temp_map { - pmd_t *pmd; - void *address; - int allocated; -} temp_mappings[] __initdata = { - { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, - { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, - {} -}; - -static __meminit void *alloc_low_page(int *index, unsigned long *phys) -{ - struct temp_map *ti; - int i; - unsigned long pfn = table_end++, paddr; - 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"); - for (i = 0; temp_mappings[i].allocated; i++) { - if (!temp_mappings[i].pmd) - panic("alloc_low_page: ran out of temp mappings"); - } - ti = &temp_mappings[i]; - paddr = (pfn << PAGE_SHIFT) & PMD_MASK; - set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); - ti->allocated = 1; - __flush_tlb(); - adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); - memset(adr, 0, PAGE_SIZE); - *index = i; - *phys = pfn * PAGE_SIZE; - return adr; -} - -static __meminit void unmap_low_page(int i) -{ - struct temp_map *ti; - - if (after_bootmem) - return; - - ti = &temp_mappings[i]; - set_pmd(ti->pmd, __pmd(0)); - ti->allocated = 0; -} - -static void __meminit -phys_pmd_init(pmd_t *pmd, unsigned long address, unsigned long end) -{ - int i; - - for (i = 0; i < PTRS_PER_PMD; pmd++, i++, address += PMD_SIZE) { - unsigned long entry; - - if (address > end) { - for (; i < PTRS_PER_PMD; i++, pmd++) - set_pmd(pmd, __pmd(0)); - break; - } - 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, (unsigned long)__va(address)); - - if (pmd_none(*pmd)) { - 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, unsigned long address, unsigned long end) -{ - long i = pud_index(address); - - pud = pud + i; - - if (after_bootmem && pud_val(*pud)) { - phys_pmd_update(pud, address, end); - return; - } - - for (; i < PTRS_PER_PUD; pud++, i++) { - int map; - unsigned long paddr, pmd_phys; - pmd_t *pmd; - - paddr = (address & PGDIR_MASK) + i*PUD_SIZE; - if (paddr >= end) - break; - - if (!after_bootmem && !e820_mapped(paddr, paddr+PUD_SIZE, 0)) { - set_pud(pud, __pud(0)); - continue; - } - - pmd = alloc_low_page(&map, &pmd_phys); - spin_lock(&init_mm.page_table_lock); - set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); - phys_pmd_init(pmd, paddr, end); - spin_unlock(&init_mm.page_table_lock); - unmap_low_page(map); - } - __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_end << PAGE_SHIFT); -} - -/* 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) { - int map; - unsigned long pud_phys; - pgd_t *pgd = pgd_offset_k(start); - pud_t *pud; - - if (after_bootmem) - pud = pud_offset_k(pgd, __PAGE_OFFSET); - else - pud = alloc_low_page(&map, &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(map); - } - - if (!after_bootmem) - asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); - __flush_tlb_all(); -} - -void __cpuinit zap_low_mappings(int cpu) -{ - if (cpu == 0) { - pgd_t *pgd = pgd_offset_k(0UL); - pgd_clear(pgd); - } else { - /* - * For AP's, zap the low identity mappings by changing the cr3 - * to init_level4_pgt and doing local flush tlb all - */ - asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); - } - __flush_tlb_all(); -} - -/* Compute zone sizes for the DMA and DMA32 zones in a node. */ -__init void -size_zones(unsigned long *z, unsigned long *h, - unsigned long start_pfn, unsigned long end_pfn) -{ - int i; - unsigned long w; - - for (i = 0; i < MAX_NR_ZONES; i++) - z[i] = 0; - - if (start_pfn < MAX_DMA_PFN) - z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; - if (start_pfn < MAX_DMA32_PFN) { - unsigned long dma32_pfn = MAX_DMA32_PFN; - if (dma32_pfn > end_pfn) - dma32_pfn = end_pfn; - z[ZONE_DMA32] = dma32_pfn - start_pfn; - } - z[ZONE_NORMAL] = end_pfn - start_pfn; - - /* Remove lower zones from higher ones. */ - w = 0; - for (i = 0; i < MAX_NR_ZONES; i++) { - if (z[i]) - z[i] -= w; - w += z[i]; - } - - /* Compute holes */ - w = start_pfn; - for (i = 0; i < MAX_NR_ZONES; i++) { - unsigned long s = w; - w += z[i]; - h[i] = e820_hole_size(s, w); - } - - /* Add the space pace needed for mem_map to the holes too. */ - for (i = 0; i < MAX_NR_ZONES; i++) - h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; - - /* The 16MB DMA zone has the kernel and other misc mappings. - Account them too */ - if (h[ZONE_DMA]) { - h[ZONE_DMA] += dma_reserve; - if (h[ZONE_DMA] >= z[ZONE_DMA]) { - printk(KERN_WARNING - "Kernel too large and filling up ZONE_DMA?\n"); - h[ZONE_DMA] = z[ZONE_DMA]; - } - } -} - -#ifndef CONFIG_NUMA -void __init paging_init(void) -{ - unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; - - memory_present(0, 0, end_pfn); - sparse_init(); - size_zones(zones, holes, 0, end_pfn); - free_area_init_node(0, NODE_DATA(0), zones, - __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); -} -#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 - * These are only for non-NUMA machines right now. - */ -#ifdef CONFIG_MEMORY_HOTPLUG - -void online_page(struct page *page) -{ - ClearPageReserved(page); - set_page_count(page, 1); - __free_page(page); - totalram_pages++; - num_physpages++; -} - -int add_memory(u64 start, u64 size) -{ - struct pglist_data *pgdat = NODE_DATA(0); - struct zone *zone = pgdat->node_zones + MAX_NR_ZONES-2; - unsigned long start_pfn = start >> PAGE_SHIFT; - unsigned long nr_pages = size >> PAGE_SHIFT; - int ret; - - ret = __add_pages(zone, start_pfn, nr_pages); - if (ret) - goto error; - - init_memory_mapping(start, (start + size -1)); - - return ret; -error: - printk("%s: Problem encountered in __add_pages!\n", __func__); - return ret; -} -EXPORT_SYMBOL_GPL(add_memory); - -int remove_memory(u64 start, u64 size) -{ - return -EINVAL; -} -EXPORT_SYMBOL_GPL(remove_memory); - -#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; - -#ifdef CONFIG_SWIOTLB - pci_swiotlb_init(); -#endif - no_iommu_init(); - - /* How many end-of-memory variables you have, grandma! */ - max_low_pfn = end_pfn; - max_pfn = end_pfn; - num_physpages = end_pfn; - high_memory = (void *) __va(end_pfn * PAGE_SIZE); - - /* 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 - e820_hole_size(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); - -#ifdef CONFIG_SMP - /* - * Sync boot_level4_pgt mappings with the init_level4_pgt - * except for the low identity mappings which are already zapped - * in init_level4_pgt. This sync-up is essential for AP's bringup - */ - memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); -#endif -} - -void free_initmem(void) -{ - unsigned long addr; - - addr = (unsigned long)(&__init_begin); - for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { - ClearPageReserved(virt_to_page(addr)); - set_page_count(virt_to_page(addr), 1); - memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); - free_page(addr); - totalram_pages++; - } - memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); - printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10); -} - -#ifdef CONFIG_DEBUG_RODATA - -extern char __start_rodata, __end_rodata; -void mark_rodata_ro(void) -{ - unsigned long addr = (unsigned long)&__start_rodata; - - for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE) - change_page_attr_addr(addr, 1, PAGE_KERNEL_RO); - - printk ("Write protecting the kernel read-only data: %luk\n", - (&__end_rodata - &__start_rodata) >> 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) -{ - if (start >= end) - return; - printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); - for (; start < end; start += PAGE_SIZE) { - ClearPageReserved(virt_to_page(start)); - set_page_count(virt_to_page(start), 1); - free_page(start); - totalram_pages++; - } -} -#endif - -void __init reserve_bootmem_generic(unsigned long phys, unsigned len) -{ - /* Should check here against the e820 map to avoid double free */ -#ifdef CONFIG_NUMA - int nid = phys_to_nid(phys); - 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; -} - -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)); -} - -#ifdef CONFIG_SYSCTL -#include <linux/sysctl.h> - -extern int exception_trace, page_fault_trace; - -static ctl_table debug_table2[] = { - { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, - proc_dointvec }, - { 0, } -}; - -static ctl_table debug_root_table2[] = { - { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, - .child = debug_table2 }, - { 0 }, -}; - -static __init int x8664_sysctl_init(void) -{ - register_sysctl_table(debug_root_table2, 1); - return 0; -} -__initcall(x8664_sysctl_init); -#endif - -/* A pseudo VMAs 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_END, - .vm_page_prot = PAGE_READONLY -}; - -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); -} |