1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
631 lines
16 KiB
C
631 lines
16 KiB
C
/*
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* linux/arch/x86_64/mm/init.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright (C) 2000 Pavel Machek <pavel@suse.cz>
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* Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
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*/
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#include <linux/config.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/proc_fs.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/dma.h>
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#include <asm/fixmap.h>
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#include <asm/e820.h>
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#include <asm/apic.h>
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#include <asm/tlb.h>
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#include <asm/mmu_context.h>
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#include <asm/proto.h>
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#include <asm/smp.h>
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#ifndef Dprintk
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#define Dprintk(x...)
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#endif
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#ifdef CONFIG_GART_IOMMU
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extern int swiotlb;
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#endif
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extern char _stext[];
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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/*
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* NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
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* physical space so we can cache the place of the first one and move
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* around without checking the pgd every time.
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*/
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void show_mem(void)
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{
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int i, total = 0, reserved = 0;
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int shared = 0, cached = 0;
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pg_data_t *pgdat;
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struct page *page;
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
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for_each_pgdat(pgdat) {
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for (i = 0; i < pgdat->node_spanned_pages; ++i) {
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page = pfn_to_page(pgdat->node_start_pfn + i);
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total++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (page_count(page))
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shared += page_count(page) - 1;
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}
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}
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printk("%d pages of RAM\n", total);
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printk("%d reserved pages\n",reserved);
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printk("%d pages shared\n",shared);
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printk("%d pages swap cached\n",cached);
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}
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/* References to section boundaries */
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extern char _text, _etext, _edata, __bss_start, _end[];
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extern char __init_begin, __init_end;
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int after_bootmem;
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static void *spp_getpage(void)
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{
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void *ptr;
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if (after_bootmem)
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ptr = (void *) get_zeroed_page(GFP_ATOMIC);
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else
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ptr = alloc_bootmem_pages(PAGE_SIZE);
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if (!ptr || ((unsigned long)ptr & ~PAGE_MASK))
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panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":"");
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Dprintk("spp_getpage %p\n", ptr);
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return ptr;
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}
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static void set_pte_phys(unsigned long vaddr,
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unsigned long phys, pgprot_t prot)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte, new_pte;
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Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys);
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pgd = pgd_offset_k(vaddr);
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if (pgd_none(*pgd)) {
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printk("PGD FIXMAP MISSING, it should be setup in head.S!\n");
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return;
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}
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pud = pud_offset(pgd, vaddr);
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if (pud_none(*pud)) {
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pmd = (pmd_t *) spp_getpage();
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set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
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if (pmd != pmd_offset(pud, 0)) {
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printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0));
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return;
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}
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}
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pmd = pmd_offset(pud, vaddr);
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if (pmd_none(*pmd)) {
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pte = (pte_t *) spp_getpage();
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set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
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if (pte != pte_offset_kernel(pmd, 0)) {
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printk("PAGETABLE BUG #02!\n");
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return;
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}
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}
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new_pte = pfn_pte(phys >> PAGE_SHIFT, prot);
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pte = pte_offset_kernel(pmd, vaddr);
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if (!pte_none(*pte) &&
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pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
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pte_ERROR(*pte);
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set_pte(pte, new_pte);
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/*
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* It's enough to flush this one mapping.
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* (PGE mappings get flushed as well)
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*/
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__flush_tlb_one(vaddr);
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}
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/* NOTE: this is meant to be run only at boot */
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void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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printk("Invalid __set_fixmap\n");
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return;
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}
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set_pte_phys(address, phys, prot);
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}
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unsigned long __initdata table_start, table_end;
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extern pmd_t temp_boot_pmds[];
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static struct temp_map {
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pmd_t *pmd;
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void *address;
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int allocated;
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} temp_mappings[] __initdata = {
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{ &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) },
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{ &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) },
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{}
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};
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static __init void *alloc_low_page(int *index, unsigned long *phys)
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{
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struct temp_map *ti;
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int i;
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unsigned long pfn = table_end++, paddr;
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void *adr;
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if (pfn >= end_pfn)
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panic("alloc_low_page: ran out of memory");
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for (i = 0; temp_mappings[i].allocated; i++) {
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if (!temp_mappings[i].pmd)
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panic("alloc_low_page: ran out of temp mappings");
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}
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ti = &temp_mappings[i];
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paddr = (pfn << PAGE_SHIFT) & PMD_MASK;
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set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE));
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ti->allocated = 1;
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__flush_tlb();
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adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK);
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*index = i;
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*phys = pfn * PAGE_SIZE;
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return adr;
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}
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static __init void unmap_low_page(int i)
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{
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struct temp_map *ti = &temp_mappings[i];
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set_pmd(ti->pmd, __pmd(0));
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ti->allocated = 0;
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}
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static void __init phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
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{
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long i, j;
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i = pud_index(address);
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pud = pud + i;
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for (; i < PTRS_PER_PUD; pud++, i++) {
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int map;
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unsigned long paddr, pmd_phys;
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pmd_t *pmd;
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paddr = address + i*PUD_SIZE;
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if (paddr >= end) {
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for (; i < PTRS_PER_PUD; i++, pud++)
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set_pud(pud, __pud(0));
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break;
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}
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if (!e820_mapped(paddr, paddr+PUD_SIZE, 0)) {
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set_pud(pud, __pud(0));
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continue;
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}
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pmd = alloc_low_page(&map, &pmd_phys);
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set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
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for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
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unsigned long pe;
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if (paddr >= end) {
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for (; j < PTRS_PER_PMD; j++, pmd++)
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set_pmd(pmd, __pmd(0));
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break;
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}
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pe = _PAGE_NX|_PAGE_PSE | _KERNPG_TABLE | _PAGE_GLOBAL | paddr;
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pe &= __supported_pte_mask;
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set_pmd(pmd, __pmd(pe));
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}
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unmap_low_page(map);
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}
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__flush_tlb();
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}
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static void __init find_early_table_space(unsigned long end)
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{
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unsigned long puds, pmds, tables;
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puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
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pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
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tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) +
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round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
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table_start = find_e820_area(0x8000, __pa_symbol(&_text), tables);
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if (table_start == -1UL)
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panic("Cannot find space for the kernel page tables");
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table_start >>= PAGE_SHIFT;
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table_end = table_start;
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}
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/* Setup the direct mapping of the physical memory at PAGE_OFFSET.
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This runs before bootmem is initialized and gets pages directly from the
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physical memory. To access them they are temporarily mapped. */
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void __init init_memory_mapping(unsigned long start, unsigned long end)
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{
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unsigned long next;
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Dprintk("init_memory_mapping\n");
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/*
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* Find space for the kernel direct mapping tables.
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* Later we should allocate these tables in the local node of the memory
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* mapped. Unfortunately this is done currently before the nodes are
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* discovered.
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*/
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find_early_table_space(end);
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start = (unsigned long)__va(start);
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end = (unsigned long)__va(end);
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for (; start < end; start = next) {
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int map;
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unsigned long pud_phys;
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pud_t *pud = alloc_low_page(&map, &pud_phys);
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next = start + PGDIR_SIZE;
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if (next > end)
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next = end;
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phys_pud_init(pud, __pa(start), __pa(next));
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set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
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unmap_low_page(map);
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}
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asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features));
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__flush_tlb_all();
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early_printk("kernel direct mapping tables upto %lx @ %lx-%lx\n", end,
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table_start<<PAGE_SHIFT,
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table_end<<PAGE_SHIFT);
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}
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extern struct x8664_pda cpu_pda[NR_CPUS];
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/* Assumes all CPUs still execute in init_mm */
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void zap_low_mappings(void)
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{
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pgd_t *pgd = pgd_offset_k(0UL);
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pgd_clear(pgd);
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flush_tlb_all();
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}
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#ifndef CONFIG_DISCONTIGMEM
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void __init paging_init(void)
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{
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{
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unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
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unsigned int max_dma;
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max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
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if (end_pfn < max_dma)
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zones_size[ZONE_DMA] = end_pfn;
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else {
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zones_size[ZONE_DMA] = max_dma;
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zones_size[ZONE_NORMAL] = end_pfn - max_dma;
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}
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free_area_init(zones_size);
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}
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return;
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}
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#endif
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/* Unmap a kernel mapping if it exists. This is useful to avoid prefetches
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from the CPU leading to inconsistent cache lines. address and size
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must be aligned to 2MB boundaries.
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Does nothing when the mapping doesn't exist. */
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void __init clear_kernel_mapping(unsigned long address, unsigned long size)
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{
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unsigned long end = address + size;
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BUG_ON(address & ~LARGE_PAGE_MASK);
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BUG_ON(size & ~LARGE_PAGE_MASK);
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for (; address < end; address += LARGE_PAGE_SIZE) {
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pgd_t *pgd = pgd_offset_k(address);
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pud_t *pud;
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pmd_t *pmd;
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if (pgd_none(*pgd))
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continue;
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pud = pud_offset(pgd, address);
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if (pud_none(*pud))
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continue;
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pmd = pmd_offset(pud, address);
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if (!pmd || pmd_none(*pmd))
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continue;
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if (0 == (pmd_val(*pmd) & _PAGE_PSE)) {
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/* Could handle this, but it should not happen currently. */
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printk(KERN_ERR
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"clear_kernel_mapping: mapping has been split. will leak memory\n");
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pmd_ERROR(*pmd);
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}
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set_pmd(pmd, __pmd(0));
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}
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__flush_tlb_all();
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}
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static inline int page_is_ram (unsigned long pagenr)
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{
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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unsigned long addr, end;
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if (e820.map[i].type != E820_RAM) /* not usable memory */
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continue;
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/*
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* !!!FIXME!!! Some BIOSen report areas as RAM that
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* are not. Notably the 640->1Mb area. We need a sanity
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* check here.
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*/
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addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
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end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
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if ((pagenr >= addr) && (pagenr < end))
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return 1;
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}
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return 0;
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}
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extern int swiotlb_force;
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static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,
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kcore_vsyscall;
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void __init mem_init(void)
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{
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int codesize, reservedpages, datasize, initsize;
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int tmp;
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#ifdef CONFIG_SWIOTLB
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if (swiotlb_force)
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swiotlb = 1;
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if (!iommu_aperture &&
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(end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu))
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swiotlb = 1;
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if (swiotlb)
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swiotlb_init();
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#endif
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/* How many end-of-memory variables you have, grandma! */
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max_low_pfn = end_pfn;
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max_pfn = end_pfn;
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num_physpages = end_pfn;
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high_memory = (void *) __va(end_pfn * PAGE_SIZE);
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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reservedpages = 0;
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/* this will put all low memory onto the freelists */
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#ifdef CONFIG_DISCONTIGMEM
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totalram_pages += numa_free_all_bootmem();
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tmp = 0;
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/* should count reserved pages here for all nodes */
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#else
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max_mapnr = end_pfn;
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if (!mem_map) BUG();
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totalram_pages += free_all_bootmem();
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for (tmp = 0; tmp < end_pfn; tmp++)
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/*
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* Only count reserved RAM pages
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*/
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if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
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reservedpages++;
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#endif
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after_bootmem = 1;
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codesize = (unsigned long) &_etext - (unsigned long) &_text;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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/* Register memory areas for /proc/kcore */
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kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
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kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
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VMALLOC_END-VMALLOC_START);
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kclist_add(&kcore_kernel, &_stext, _end - _stext);
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kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
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kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
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VSYSCALL_END - VSYSCALL_START);
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printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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end_pfn << (PAGE_SHIFT-10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT-10),
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datasize >> 10,
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initsize >> 10);
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/*
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* Subtle. SMP is doing its boot stuff late (because it has to
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* fork idle threads) - but it also needs low mappings for the
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* protected-mode entry to work. We zap these entries only after
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* the WP-bit has been tested.
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*/
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#ifndef CONFIG_SMP
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zap_low_mappings();
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#endif
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}
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|
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extern char __initdata_begin[], __initdata_end[];
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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set_page_count(virt_to_page(addr), 1);
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memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE);
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free_page(addr);
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totalram_pages++;
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}
|
|
memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin);
|
|
printk ("Freeing unused kernel memory: %luk freed\n", (&__init_end - &__init_begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (start < (unsigned long)&_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_DISCONTIGMEM
|
|
int nid = phys_to_nid(phys);
|
|
reserve_bootmem_node(NODE_DATA(nid), phys, len);
|
|
#else
|
|
reserve_bootmem(phys, len);
|
|
#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));
|
|
}
|
|
|
|
#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 },
|
|
#ifdef CONFIG_CHECKING
|
|
{ 100, "page-fault-trace", &page_fault_trace, sizeof(int), 0644, NULL,
|
|
proc_dointvec },
|
|
#endif
|
|
{ 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
|
|
|
|
/* Pseudo VMAs to allow ptrace access for the vsyscall pages. x86-64 has two
|
|
different ones: one for 32bit and one for 64bit. Use the appropiate
|
|
for the target task. */
|
|
|
|
static struct vm_area_struct gate_vma = {
|
|
.vm_start = VSYSCALL_START,
|
|
.vm_end = VSYSCALL_END,
|
|
.vm_page_prot = PAGE_READONLY
|
|
};
|
|
|
|
static struct vm_area_struct gate32_vma = {
|
|
.vm_start = VSYSCALL32_BASE,
|
|
.vm_end = VSYSCALL32_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)) {
|
|
/* lookup code assumes the pages are present. set them up
|
|
now */
|
|
if (__map_syscall32(tsk->mm, VSYSCALL32_BASE) < 0)
|
|
return NULL;
|
|
return &gate32_vma;
|
|
}
|
|
#endif
|
|
return &gate_vma;
|
|
}
|
|
|
|
int in_gate_area(struct task_struct *task, unsigned long addr)
|
|
{
|
|
struct vm_area_struct *vma = get_gate_vma(task);
|
|
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)) ||
|
|
((addr >= VSYSCALL32_BASE) && (addr < VSYSCALL32_END)));
|
|
}
|