1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2003 by Ralf Baechle 7 */ 8 #include <linux/config.h> 9 #include <linux/init.h> 10 #include <linux/mm.h> 11 #include <linux/bootmem.h> 12 #include <linux/highmem.h> 13 #include <asm/fixmap.h> 14 #include <asm/pgtable.h> 15 16 void pgd_init(unsigned long page) 17 { 18 unsigned long *p = (unsigned long *) page; 19 int i; 20 21 for (i = 0; i < USER_PTRS_PER_PGD; i+=8) { 22 p[i + 0] = (unsigned long) invalid_pte_table; 23 p[i + 1] = (unsigned long) invalid_pte_table; 24 p[i + 2] = (unsigned long) invalid_pte_table; 25 p[i + 3] = (unsigned long) invalid_pte_table; 26 p[i + 4] = (unsigned long) invalid_pte_table; 27 p[i + 5] = (unsigned long) invalid_pte_table; 28 p[i + 6] = (unsigned long) invalid_pte_table; 29 p[i + 7] = (unsigned long) invalid_pte_table; 30 } 31 } 32 33 void __init pagetable_init(void) 34 { 35 #ifdef CONFIG_HIGHMEM 36 unsigned long vaddr; 37 pgd_t *pgd, *pgd_base; 38 pud_t *pud; 39 pmd_t *pmd; 40 pte_t *pte; 41 #endif 42 43 /* Initialize the entire pgd. */ 44 pgd_init((unsigned long)swapper_pg_dir); 45 pgd_init((unsigned long)swapper_pg_dir 46 + sizeof(pgd_t) * USER_PTRS_PER_PGD); 47 48 #ifdef CONFIG_HIGHMEM 49 pgd_base = swapper_pg_dir; 50 51 /* 52 * Fixed mappings: 53 */ 54 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 55 fixrange_init(vaddr, 0, pgd_base); 56 57 /* 58 * Permanent kmaps: 59 */ 60 vaddr = PKMAP_BASE; 61 fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); 62 63 pgd = swapper_pg_dir + __pgd_offset(vaddr); 64 pud = pud_offset(pgd, vaddr); 65 pmd = pmd_offset(pud, vaddr); 66 pte = pte_offset_kernel(pmd, vaddr); 67 pkmap_page_table = pte; 68 #endif 69 } 70