98 строки
2.2 KiB
C
98 строки
2.2 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2003 by Ralf Baechle
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/highmem.h>
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#include <asm/pgtable.h>
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void pgd_init(unsigned long page)
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{
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unsigned long *p = (unsigned long *) page;
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int i;
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for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
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p[i + 0] = (unsigned long) invalid_pte_table;
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p[i + 1] = (unsigned long) invalid_pte_table;
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p[i + 2] = (unsigned long) invalid_pte_table;
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p[i + 3] = (unsigned long) invalid_pte_table;
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p[i + 4] = (unsigned long) invalid_pte_table;
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p[i + 5] = (unsigned long) invalid_pte_table;
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p[i + 6] = (unsigned long) invalid_pte_table;
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p[i + 7] = (unsigned long) invalid_pte_table;
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}
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}
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#ifdef CONFIG_HIGHMEM
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static void __init fixrange_init (unsigned long start, unsigned long end,
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pgd_t *pgd_base)
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{
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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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int i, j;
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unsigned long vaddr;
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vaddr = start;
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i = __pgd_offset(vaddr);
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j = __pmd_offset(vaddr);
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pgd = pgd_base + i;
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for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
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pmd = (pmd_t *)pgd;
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for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
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if (pmd_none(*pmd)) {
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pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
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set_pmd(pmd, __pmd((unsigned long)pte));
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if (pte != pte_offset_kernel(pmd, 0))
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BUG();
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}
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vaddr += PMD_SIZE;
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}
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j = 0;
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}
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}
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#endif
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void __init pagetable_init(void)
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{
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#ifdef CONFIG_HIGHMEM
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unsigned long vaddr;
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pgd_t *pgd, *pgd_base;
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pmd_t *pmd;
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pte_t *pte;
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#endif
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/* Initialize the entire pgd. */
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pgd_init((unsigned long)swapper_pg_dir);
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pgd_init((unsigned long)swapper_pg_dir
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+ sizeof(pgd_t) * USER_PTRS_PER_PGD);
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#ifdef CONFIG_HIGHMEM
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pgd_base = swapper_pg_dir;
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/*
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* Fixed mappings:
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*/
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vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
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fixrange_init(vaddr, 0, pgd_base);
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/*
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* Permanent kmaps:
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*/
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vaddr = PKMAP_BASE;
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fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
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pgd = swapper_pg_dir + __pgd_offset(vaddr);
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pmd = pmd_offset(pgd, vaddr);
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pte = pte_offset_kernel(pmd, vaddr);
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pkmap_page_table = pte;
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#endif
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}
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