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/init.h> 9 #include <linux/mm.h> 10 #include <linux/memblock.h> 11 #include <linux/highmem.h> 12 #include <asm/fixmap.h> 13 #include <asm/pgalloc.h> 14 #include <asm/tlbflush.h> 15 16 void pgd_init(void *addr) 17 { 18 unsigned long *p = (unsigned long *)addr; 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 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) 34 void set_pmd_at(struct mm_struct *mm, unsigned long addr, 35 pmd_t *pmdp, pmd_t pmd) 36 { 37 *pmdp = pmd; 38 } 39 #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */ 40 41 void __init pagetable_init(void) 42 { 43 unsigned long vaddr; 44 pgd_t *pgd_base; 45 #ifdef CONFIG_HIGHMEM 46 pgd_t *pgd; 47 p4d_t *p4d; 48 pud_t *pud; 49 pmd_t *pmd; 50 pte_t *pte; 51 #endif 52 53 /* Initialize the entire pgd. */ 54 pgd_init(swapper_pg_dir); 55 pgd_init(&swapper_pg_dir[USER_PTRS_PER_PGD]); 56 57 pgd_base = swapper_pg_dir; 58 59 /* 60 * Fixed mappings: 61 */ 62 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1); 63 fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base); 64 65 #ifdef CONFIG_HIGHMEM 66 /* 67 * Permanent kmaps: 68 */ 69 vaddr = PKMAP_BASE; 70 fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); 71 72 pgd = swapper_pg_dir + pgd_index(vaddr); 73 p4d = p4d_offset(pgd, vaddr); 74 pud = pud_offset(p4d, vaddr); 75 pmd = pmd_offset(pud, vaddr); 76 pte = pte_offset_kernel(pmd, vaddr); 77 pkmap_page_table = pte; 78 #endif 79 } 80