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