mirror of https://gitee.com/openkylin/linux.git
971 lines
25 KiB
C
971 lines
25 KiB
C
/*
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*
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* Copyright (C) 1995 Linus Torvalds
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*
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
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*/
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#include <linux/module.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/hugetlb.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/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/pci.h>
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#include <linux/pfn.h>
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#include <linux/poison.h>
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#include <linux/proc_fs.h>
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#include <linux/memory_hotplug.h>
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#include <linux/initrd.h>
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#include <linux/cpumask.h>
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#include <linux/gfp.h>
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#include <asm/asm.h>
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#include <asm/bios_ebda.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/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/bugs.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/olpc_ofw.h>
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#include <asm/pgalloc.h>
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#include <asm/sections.h>
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#include <asm/paravirt.h>
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#include <asm/setup.h>
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#include <asm/cacheflush.h>
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#include <asm/page_types.h>
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#include <asm/init.h>
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unsigned long highstart_pfn, highend_pfn;
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static noinline int do_test_wp_bit(void);
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bool __read_mostly __vmalloc_start_set = false;
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static __init void *alloc_low_page(void)
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{
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unsigned long pfn = pgt_buf_end++;
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void *adr;
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if (pfn >= pgt_buf_top)
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panic("alloc_low_page: ran out of memory");
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adr = __va(pfn * PAGE_SIZE);
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clear_page(adr);
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return adr;
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}
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/*
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* Creates a middle page table and puts a pointer to it in the
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* given global directory entry. This only returns the gd entry
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* in non-PAE compilation mode, since the middle layer is folded.
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*/
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static pmd_t * __init one_md_table_init(pgd_t *pgd)
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{
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pud_t *pud;
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pmd_t *pmd_table;
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#ifdef CONFIG_X86_PAE
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if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
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if (after_bootmem)
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pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE);
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else
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pmd_table = (pmd_t *)alloc_low_page();
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paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
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set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
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pud = pud_offset(pgd, 0);
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BUG_ON(pmd_table != pmd_offset(pud, 0));
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return pmd_table;
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}
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#endif
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pud = pud_offset(pgd, 0);
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pmd_table = pmd_offset(pud, 0);
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return pmd_table;
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}
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/*
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* Create a page table and place a pointer to it in a middle page
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* directory entry:
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*/
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static pte_t * __init one_page_table_init(pmd_t *pmd)
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{
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if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
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pte_t *page_table = NULL;
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if (after_bootmem) {
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#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
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page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
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#endif
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if (!page_table)
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page_table =
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(pte_t *)alloc_bootmem_pages(PAGE_SIZE);
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} else
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page_table = (pte_t *)alloc_low_page();
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paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
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set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
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BUG_ON(page_table != pte_offset_kernel(pmd, 0));
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}
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return pte_offset_kernel(pmd, 0);
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}
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pmd_t * __init populate_extra_pmd(unsigned long vaddr)
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{
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int pgd_idx = pgd_index(vaddr);
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int pmd_idx = pmd_index(vaddr);
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return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx;
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}
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pte_t * __init populate_extra_pte(unsigned long vaddr)
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{
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int pte_idx = pte_index(vaddr);
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pmd_t *pmd;
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pmd = populate_extra_pmd(vaddr);
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return one_page_table_init(pmd) + pte_idx;
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}
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static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
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unsigned long vaddr, pte_t *lastpte)
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{
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#ifdef CONFIG_HIGHMEM
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/*
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* Something (early fixmap) may already have put a pte
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* page here, which causes the page table allocation
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* to become nonlinear. Attempt to fix it, and if it
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* is still nonlinear then we have to bug.
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*/
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int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
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int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
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if (pmd_idx_kmap_begin != pmd_idx_kmap_end
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&& (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin
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&& (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end
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&& ((__pa(pte) >> PAGE_SHIFT) < pgt_buf_start
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|| (__pa(pte) >> PAGE_SHIFT) >= pgt_buf_end)) {
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pte_t *newpte;
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int i;
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BUG_ON(after_bootmem);
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newpte = alloc_low_page();
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for (i = 0; i < PTRS_PER_PTE; i++)
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set_pte(newpte + i, pte[i]);
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paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT);
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set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE));
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BUG_ON(newpte != pte_offset_kernel(pmd, 0));
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__flush_tlb_all();
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paravirt_release_pte(__pa(pte) >> PAGE_SHIFT);
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pte = newpte;
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}
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BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)
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&& vaddr > fix_to_virt(FIX_KMAP_END)
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&& lastpte && lastpte + PTRS_PER_PTE != pte);
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#endif
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return pte;
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}
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/*
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* This function initializes a certain range of kernel virtual memory
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* with new bootmem page tables, everywhere page tables are missing in
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* the given range.
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*
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* NOTE: The pagetables are allocated contiguous on the physical space
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* so we can cache the place of the first one and move around without
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* checking the pgd every time.
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*/
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static void __init
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page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
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{
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int pgd_idx, pmd_idx;
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unsigned long vaddr;
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte = NULL;
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vaddr = start;
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pgd_idx = pgd_index(vaddr);
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pmd_idx = pmd_index(vaddr);
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pgd = pgd_base + pgd_idx;
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for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
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pmd = one_md_table_init(pgd);
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pmd = pmd + pmd_index(vaddr);
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for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
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pmd++, pmd_idx++) {
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pte = page_table_kmap_check(one_page_table_init(pmd),
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pmd, vaddr, pte);
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vaddr += PMD_SIZE;
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}
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pmd_idx = 0;
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}
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}
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static inline int is_kernel_text(unsigned long addr)
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{
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if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end)
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return 1;
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return 0;
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}
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/*
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* This maps the physical memory to kernel virtual address space, a total
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* of max_low_pfn pages, by creating page tables starting from address
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* PAGE_OFFSET:
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*/
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unsigned long __init
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kernel_physical_mapping_init(unsigned long start,
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unsigned long end,
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unsigned long page_size_mask)
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{
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int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
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unsigned long last_map_addr = end;
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unsigned long start_pfn, end_pfn;
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pgd_t *pgd_base = swapper_pg_dir;
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int pgd_idx, pmd_idx, pte_ofs;
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unsigned long pfn;
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte;
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unsigned pages_2m, pages_4k;
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int mapping_iter;
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start_pfn = start >> PAGE_SHIFT;
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end_pfn = end >> PAGE_SHIFT;
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/*
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* First iteration will setup identity mapping using large/small pages
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* based on use_pse, with other attributes same as set by
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* the early code in head_32.S
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*
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* Second iteration will setup the appropriate attributes (NX, GLOBAL..)
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* as desired for the kernel identity mapping.
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*
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* This two pass mechanism conforms to the TLB app note which says:
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*
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* "Software should not write to a paging-structure entry in a way
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* that would change, for any linear address, both the page size
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* and either the page frame or attributes."
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*/
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mapping_iter = 1;
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if (!cpu_has_pse)
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use_pse = 0;
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repeat:
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pages_2m = pages_4k = 0;
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pfn = start_pfn;
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pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
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pgd = pgd_base + pgd_idx;
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for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
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pmd = one_md_table_init(pgd);
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if (pfn >= end_pfn)
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continue;
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#ifdef CONFIG_X86_PAE
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pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
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pmd += pmd_idx;
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#else
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pmd_idx = 0;
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#endif
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for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
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pmd++, pmd_idx++) {
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unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
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/*
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* Map with big pages if possible, otherwise
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* create normal page tables:
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*/
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if (use_pse) {
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unsigned int addr2;
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pgprot_t prot = PAGE_KERNEL_LARGE;
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/*
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* first pass will use the same initial
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* identity mapping attribute + _PAGE_PSE.
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*/
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pgprot_t init_prot =
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__pgprot(PTE_IDENT_ATTR |
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_PAGE_PSE);
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addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
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PAGE_OFFSET + PAGE_SIZE-1;
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if (is_kernel_text(addr) ||
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is_kernel_text(addr2))
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prot = PAGE_KERNEL_LARGE_EXEC;
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pages_2m++;
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if (mapping_iter == 1)
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set_pmd(pmd, pfn_pmd(pfn, init_prot));
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else
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set_pmd(pmd, pfn_pmd(pfn, prot));
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pfn += PTRS_PER_PTE;
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continue;
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}
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pte = one_page_table_init(pmd);
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pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
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pte += pte_ofs;
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for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
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pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
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pgprot_t prot = PAGE_KERNEL;
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/*
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* first pass will use the same initial
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* identity mapping attribute.
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*/
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pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);
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if (is_kernel_text(addr))
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prot = PAGE_KERNEL_EXEC;
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pages_4k++;
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if (mapping_iter == 1) {
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set_pte(pte, pfn_pte(pfn, init_prot));
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last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
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} else
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set_pte(pte, pfn_pte(pfn, prot));
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}
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}
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}
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if (mapping_iter == 1) {
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/*
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* update direct mapping page count only in the first
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* iteration.
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*/
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update_page_count(PG_LEVEL_2M, pages_2m);
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update_page_count(PG_LEVEL_4K, pages_4k);
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/*
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* local global flush tlb, which will flush the previous
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* mappings present in both small and large page TLB's.
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*/
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__flush_tlb_all();
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/*
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* Second iteration will set the actual desired PTE attributes.
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*/
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mapping_iter = 2;
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goto repeat;
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}
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return last_map_addr;
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}
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pte_t *kmap_pte;
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pgprot_t kmap_prot;
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static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
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{
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return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
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vaddr), vaddr), vaddr);
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}
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static void __init kmap_init(void)
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{
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unsigned long kmap_vstart;
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/*
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* Cache the first kmap pte:
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*/
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kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
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kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
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kmap_prot = PAGE_KERNEL;
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}
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#ifdef CONFIG_HIGHMEM
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static void __init permanent_kmaps_init(pgd_t *pgd_base)
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{
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unsigned long vaddr;
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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;
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vaddr = PKMAP_BASE;
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page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
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pgd = swapper_pg_dir + pgd_index(vaddr);
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pud = pud_offset(pgd, vaddr);
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pmd = pmd_offset(pud, vaddr);
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pte = pte_offset_kernel(pmd, vaddr);
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pkmap_page_table = pte;
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}
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static void __init add_one_highpage_init(struct page *page)
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{
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ClearPageReserved(page);
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init_page_count(page);
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__free_page(page);
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totalhigh_pages++;
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}
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void __init add_highpages_with_active_regions(int nid,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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struct range *range;
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int nr_range;
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int i;
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nr_range = __get_free_all_memory_range(&range, nid, start_pfn, end_pfn);
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for (i = 0; i < nr_range; i++) {
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struct page *page;
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int node_pfn;
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for (node_pfn = range[i].start; node_pfn < range[i].end;
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node_pfn++) {
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if (!pfn_valid(node_pfn))
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continue;
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page = pfn_to_page(node_pfn);
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add_one_highpage_init(page);
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}
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}
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}
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#else
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static inline void permanent_kmaps_init(pgd_t *pgd_base)
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{
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}
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#endif /* CONFIG_HIGHMEM */
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void __init native_pagetable_setup_start(pgd_t *base)
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{
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unsigned long pfn, va;
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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;
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/*
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* Remove any mappings which extend past the end of physical
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* memory from the boot time page table:
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*/
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for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) {
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va = PAGE_OFFSET + (pfn<<PAGE_SHIFT);
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pgd = base + pgd_index(va);
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if (!pgd_present(*pgd))
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break;
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pud = pud_offset(pgd, va);
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pmd = pmd_offset(pud, va);
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if (!pmd_present(*pmd))
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break;
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pte = pte_offset_kernel(pmd, va);
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if (!pte_present(*pte))
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break;
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pte_clear(NULL, va, pte);
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}
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paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT);
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}
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|
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void __init native_pagetable_setup_done(pgd_t *base)
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{
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}
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/*
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* Build a proper pagetable for the kernel mappings. Up until this
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* point, we've been running on some set of pagetables constructed by
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* the boot process.
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*
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* If we're booting on native hardware, this will be a pagetable
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* constructed in arch/x86/kernel/head_32.S. The root of the
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* pagetable will be swapper_pg_dir.
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*
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* If we're booting paravirtualized under a hypervisor, then there are
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* more options: we may already be running PAE, and the pagetable may
|
|
* or may not be based in swapper_pg_dir. In any case,
|
|
* paravirt_pagetable_setup_start() will set up swapper_pg_dir
|
|
* appropriately for the rest of the initialization to work.
|
|
*
|
|
* In general, pagetable_init() assumes that the pagetable may already
|
|
* be partially populated, and so it avoids stomping on any existing
|
|
* mappings.
|
|
*/
|
|
void __init early_ioremap_page_table_range_init(void)
|
|
{
|
|
pgd_t *pgd_base = swapper_pg_dir;
|
|
unsigned long vaddr, end;
|
|
|
|
/*
|
|
* Fixed mappings, only the page table structure has to be
|
|
* created - mappings will be set by set_fixmap():
|
|
*/
|
|
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
|
|
end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
|
|
page_table_range_init(vaddr, end, pgd_base);
|
|
early_ioremap_reset();
|
|
}
|
|
|
|
static void __init pagetable_init(void)
|
|
{
|
|
pgd_t *pgd_base = swapper_pg_dir;
|
|
|
|
permanent_kmaps_init(pgd_base);
|
|
}
|
|
|
|
pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
|
|
EXPORT_SYMBOL_GPL(__supported_pte_mask);
|
|
|
|
/* user-defined highmem size */
|
|
static unsigned int highmem_pages = -1;
|
|
|
|
/*
|
|
* highmem=size forces highmem to be exactly 'size' bytes.
|
|
* This works even on boxes that have no highmem otherwise.
|
|
* This also works to reduce highmem size on bigger boxes.
|
|
*/
|
|
static int __init parse_highmem(char *arg)
|
|
{
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
|
|
return 0;
|
|
}
|
|
early_param("highmem", parse_highmem);
|
|
|
|
#define MSG_HIGHMEM_TOO_BIG \
|
|
"highmem size (%luMB) is bigger than pages available (%luMB)!\n"
|
|
|
|
#define MSG_LOWMEM_TOO_SMALL \
|
|
"highmem size (%luMB) results in <64MB lowmem, ignoring it!\n"
|
|
/*
|
|
* All of RAM fits into lowmem - but if user wants highmem
|
|
* artificially via the highmem=x boot parameter then create
|
|
* it:
|
|
*/
|
|
void __init lowmem_pfn_init(void)
|
|
{
|
|
/* max_low_pfn is 0, we already have early_res support */
|
|
max_low_pfn = max_pfn;
|
|
|
|
if (highmem_pages == -1)
|
|
highmem_pages = 0;
|
|
#ifdef CONFIG_HIGHMEM
|
|
if (highmem_pages >= max_pfn) {
|
|
printk(KERN_ERR MSG_HIGHMEM_TOO_BIG,
|
|
pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
|
|
highmem_pages = 0;
|
|
}
|
|
if (highmem_pages) {
|
|
if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) {
|
|
printk(KERN_ERR MSG_LOWMEM_TOO_SMALL,
|
|
pages_to_mb(highmem_pages));
|
|
highmem_pages = 0;
|
|
}
|
|
max_low_pfn -= highmem_pages;
|
|
}
|
|
#else
|
|
if (highmem_pages)
|
|
printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
|
|
#endif
|
|
}
|
|
|
|
#define MSG_HIGHMEM_TOO_SMALL \
|
|
"only %luMB highmem pages available, ignoring highmem size of %luMB!\n"
|
|
|
|
#define MSG_HIGHMEM_TRIMMED \
|
|
"Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n"
|
|
/*
|
|
* We have more RAM than fits into lowmem - we try to put it into
|
|
* highmem, also taking the highmem=x boot parameter into account:
|
|
*/
|
|
void __init highmem_pfn_init(void)
|
|
{
|
|
max_low_pfn = MAXMEM_PFN;
|
|
|
|
if (highmem_pages == -1)
|
|
highmem_pages = max_pfn - MAXMEM_PFN;
|
|
|
|
if (highmem_pages + MAXMEM_PFN < max_pfn)
|
|
max_pfn = MAXMEM_PFN + highmem_pages;
|
|
|
|
if (highmem_pages + MAXMEM_PFN > max_pfn) {
|
|
printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL,
|
|
pages_to_mb(max_pfn - MAXMEM_PFN),
|
|
pages_to_mb(highmem_pages));
|
|
highmem_pages = 0;
|
|
}
|
|
#ifndef CONFIG_HIGHMEM
|
|
/* Maximum memory usable is what is directly addressable */
|
|
printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20);
|
|
if (max_pfn > MAX_NONPAE_PFN)
|
|
printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
|
|
else
|
|
printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
|
|
max_pfn = MAXMEM_PFN;
|
|
#else /* !CONFIG_HIGHMEM */
|
|
#ifndef CONFIG_HIGHMEM64G
|
|
if (max_pfn > MAX_NONPAE_PFN) {
|
|
max_pfn = MAX_NONPAE_PFN;
|
|
printk(KERN_WARNING MSG_HIGHMEM_TRIMMED);
|
|
}
|
|
#endif /* !CONFIG_HIGHMEM64G */
|
|
#endif /* !CONFIG_HIGHMEM */
|
|
}
|
|
|
|
/*
|
|
* Determine low and high memory ranges:
|
|
*/
|
|
void __init find_low_pfn_range(void)
|
|
{
|
|
/* it could update max_pfn */
|
|
|
|
if (max_pfn <= MAXMEM_PFN)
|
|
lowmem_pfn_init();
|
|
else
|
|
highmem_pfn_init();
|
|
}
|
|
|
|
#ifndef CONFIG_NEED_MULTIPLE_NODES
|
|
void __init initmem_init(void)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
highstart_pfn = highend_pfn = max_pfn;
|
|
if (max_pfn > max_low_pfn)
|
|
highstart_pfn = max_low_pfn;
|
|
memblock_x86_register_active_regions(0, 0, highend_pfn);
|
|
sparse_memory_present_with_active_regions(0);
|
|
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
|
|
pages_to_mb(highend_pfn - highstart_pfn));
|
|
num_physpages = highend_pfn;
|
|
high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
|
|
#else
|
|
memblock_x86_register_active_regions(0, 0, max_low_pfn);
|
|
sparse_memory_present_with_active_regions(0);
|
|
num_physpages = max_low_pfn;
|
|
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
|
|
#endif
|
|
#ifdef CONFIG_FLATMEM
|
|
max_mapnr = num_physpages;
|
|
#endif
|
|
__vmalloc_start_set = true;
|
|
|
|
printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
|
|
pages_to_mb(max_low_pfn));
|
|
|
|
setup_bootmem_allocator();
|
|
}
|
|
#endif /* !CONFIG_NEED_MULTIPLE_NODES */
|
|
|
|
static void __init zone_sizes_init(void)
|
|
{
|
|
unsigned long max_zone_pfns[MAX_NR_ZONES];
|
|
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
|
|
max_zone_pfns[ZONE_DMA] =
|
|
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
|
|
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
|
|
#ifdef CONFIG_HIGHMEM
|
|
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
|
|
#endif
|
|
|
|
free_area_init_nodes(max_zone_pfns);
|
|
}
|
|
|
|
void __init setup_bootmem_allocator(void)
|
|
{
|
|
printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
|
|
max_pfn_mapped<<PAGE_SHIFT);
|
|
printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
|
|
|
|
after_bootmem = 1;
|
|
}
|
|
|
|
/*
|
|
* paging_init() sets up the page tables - note that the first 8MB are
|
|
* already mapped by head.S.
|
|
*
|
|
* This routines also unmaps the page at virtual kernel address 0, so
|
|
* that we can trap those pesky NULL-reference errors in the kernel.
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
pagetable_init();
|
|
|
|
__flush_tlb_all();
|
|
|
|
kmap_init();
|
|
|
|
/*
|
|
* NOTE: at this point the bootmem allocator is fully available.
|
|
*/
|
|
olpc_dt_build_devicetree();
|
|
sparse_init();
|
|
zone_sizes_init();
|
|
}
|
|
|
|
/*
|
|
* Test if the WP bit works in supervisor mode. It isn't supported on 386's
|
|
* and also on some strange 486's. All 586+'s are OK. This used to involve
|
|
* black magic jumps to work around some nasty CPU bugs, but fortunately the
|
|
* switch to using exceptions got rid of all that.
|
|
*/
|
|
static void __init test_wp_bit(void)
|
|
{
|
|
printk(KERN_INFO
|
|
"Checking if this processor honours the WP bit even in supervisor mode...");
|
|
|
|
/* Any page-aligned address will do, the test is non-destructive */
|
|
__set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY);
|
|
boot_cpu_data.wp_works_ok = do_test_wp_bit();
|
|
clear_fixmap(FIX_WP_TEST);
|
|
|
|
if (!boot_cpu_data.wp_works_ok) {
|
|
printk(KERN_CONT "No.\n");
|
|
#ifdef CONFIG_X86_WP_WORKS_OK
|
|
panic(
|
|
"This kernel doesn't support CPU's with broken WP. Recompile it for a 386!");
|
|
#endif
|
|
} else {
|
|
printk(KERN_CONT "Ok.\n");
|
|
}
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
int codesize, reservedpages, datasize, initsize;
|
|
int tmp;
|
|
|
|
pci_iommu_alloc();
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
BUG_ON(!mem_map);
|
|
#endif
|
|
/* this will put all low memory onto the freelists */
|
|
totalram_pages += free_all_bootmem();
|
|
|
|
reservedpages = 0;
|
|
for (tmp = 0; tmp < max_low_pfn; tmp++)
|
|
/*
|
|
* Only count reserved RAM pages:
|
|
*/
|
|
if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
|
|
reservedpages++;
|
|
|
|
set_highmem_pages_init();
|
|
|
|
codesize = (unsigned long) &_etext - (unsigned long) &_text;
|
|
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
|
|
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
|
|
|
|
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
|
|
"%dk reserved, %dk data, %dk init, %ldk highmem)\n",
|
|
nr_free_pages() << (PAGE_SHIFT-10),
|
|
num_physpages << (PAGE_SHIFT-10),
|
|
codesize >> 10,
|
|
reservedpages << (PAGE_SHIFT-10),
|
|
datasize >> 10,
|
|
initsize >> 10,
|
|
totalhigh_pages << (PAGE_SHIFT-10));
|
|
|
|
printk(KERN_INFO "virtual kernel memory layout:\n"
|
|
" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
#ifdef CONFIG_HIGHMEM
|
|
" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
#endif
|
|
" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
|
|
FIXADDR_START, FIXADDR_TOP,
|
|
(FIXADDR_TOP - FIXADDR_START) >> 10,
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
|
|
(LAST_PKMAP*PAGE_SIZE) >> 10,
|
|
#endif
|
|
|
|
VMALLOC_START, VMALLOC_END,
|
|
(VMALLOC_END - VMALLOC_START) >> 20,
|
|
|
|
(unsigned long)__va(0), (unsigned long)high_memory,
|
|
((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
|
|
|
|
(unsigned long)&__init_begin, (unsigned long)&__init_end,
|
|
((unsigned long)&__init_end -
|
|
(unsigned long)&__init_begin) >> 10,
|
|
|
|
(unsigned long)&_etext, (unsigned long)&_edata,
|
|
((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
|
|
|
|
(unsigned long)&_text, (unsigned long)&_etext,
|
|
((unsigned long)&_etext - (unsigned long)&_text) >> 10);
|
|
|
|
/*
|
|
* Check boundaries twice: Some fundamental inconsistencies can
|
|
* be detected at build time already.
|
|
*/
|
|
#define __FIXADDR_TOP (-PAGE_SIZE)
|
|
#ifdef CONFIG_HIGHMEM
|
|
BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
|
|
BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE);
|
|
#endif
|
|
#define high_memory (-128UL << 20)
|
|
BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
|
|
#undef high_memory
|
|
#undef __FIXADDR_TOP
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
|
|
BUG_ON(VMALLOC_END > PKMAP_BASE);
|
|
#endif
|
|
BUG_ON(VMALLOC_START >= VMALLOC_END);
|
|
BUG_ON((unsigned long)high_memory > VMALLOC_START);
|
|
|
|
if (boot_cpu_data.wp_works_ok < 0)
|
|
test_wp_bit();
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
int arch_add_memory(int nid, u64 start, u64 size)
|
|
{
|
|
struct pglist_data *pgdata = NODE_DATA(nid);
|
|
struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM;
|
|
unsigned long start_pfn = start >> PAGE_SHIFT;
|
|
unsigned long nr_pages = size >> PAGE_SHIFT;
|
|
|
|
return __add_pages(nid, zone, start_pfn, nr_pages);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* This function cannot be __init, since exceptions don't work in that
|
|
* section. Put this after the callers, so that it cannot be inlined.
|
|
*/
|
|
static noinline int do_test_wp_bit(void)
|
|
{
|
|
char tmp_reg;
|
|
int flag;
|
|
|
|
__asm__ __volatile__(
|
|
" movb %0, %1 \n"
|
|
"1: movb %1, %0 \n"
|
|
" xorl %2, %2 \n"
|
|
"2: \n"
|
|
_ASM_EXTABLE(1b,2b)
|
|
:"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
|
|
"=q" (tmp_reg),
|
|
"=r" (flag)
|
|
:"2" (1)
|
|
:"memory");
|
|
|
|
return flag;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_RODATA
|
|
const int rodata_test_data = 0xC3;
|
|
EXPORT_SYMBOL_GPL(rodata_test_data);
|
|
|
|
int kernel_set_to_readonly __read_mostly;
|
|
|
|
void set_kernel_text_rw(void)
|
|
{
|
|
unsigned long start = PFN_ALIGN(_text);
|
|
unsigned long size = PFN_ALIGN(_etext) - start;
|
|
|
|
if (!kernel_set_to_readonly)
|
|
return;
|
|
|
|
pr_debug("Set kernel text: %lx - %lx for read write\n",
|
|
start, start+size);
|
|
|
|
set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
|
|
}
|
|
|
|
void set_kernel_text_ro(void)
|
|
{
|
|
unsigned long start = PFN_ALIGN(_text);
|
|
unsigned long size = PFN_ALIGN(_etext) - start;
|
|
|
|
if (!kernel_set_to_readonly)
|
|
return;
|
|
|
|
pr_debug("Set kernel text: %lx - %lx for read only\n",
|
|
start, start+size);
|
|
|
|
set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
|
|
}
|
|
|
|
static void mark_nxdata_nx(void)
|
|
{
|
|
/*
|
|
* When this called, init has already been executed and released,
|
|
* so everything past _etext should be NX.
|
|
*/
|
|
unsigned long start = PFN_ALIGN(_etext);
|
|
/*
|
|
* This comes from is_kernel_text upper limit. Also HPAGE where used:
|
|
*/
|
|
unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;
|
|
|
|
if (__supported_pte_mask & _PAGE_NX)
|
|
printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10);
|
|
set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT);
|
|
}
|
|
|
|
void mark_rodata_ro(void)
|
|
{
|
|
unsigned long start = PFN_ALIGN(_text);
|
|
unsigned long size = PFN_ALIGN(_etext) - start;
|
|
|
|
set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
|
|
printk(KERN_INFO "Write protecting the kernel text: %luk\n",
|
|
size >> 10);
|
|
|
|
kernel_set_to_readonly = 1;
|
|
|
|
#ifdef CONFIG_CPA_DEBUG
|
|
printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n",
|
|
start, start+size);
|
|
set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT);
|
|
|
|
printk(KERN_INFO "Testing CPA: write protecting again\n");
|
|
set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
|
|
#endif
|
|
|
|
start += size;
|
|
size = (unsigned long)__end_rodata - start;
|
|
set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
|
|
printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
|
|
size >> 10);
|
|
rodata_test();
|
|
|
|
#ifdef CONFIG_CPA_DEBUG
|
|
printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size);
|
|
set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
|
|
|
|
printk(KERN_INFO "Testing CPA: write protecting again\n");
|
|
set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
|
|
#endif
|
|
mark_nxdata_nx();
|
|
}
|
|
#endif
|
|
|