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(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 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) 34 pmd_t mk_pmd(struct page *page, pgprot_t prot) 35 { 36 pmd_t pmd; 37 38 pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot); 39 40 return pmd; 41 } 42 43 44 void set_pmd_at(struct mm_struct *mm, unsigned long addr, 45 pmd_t *pmdp, pmd_t pmd) 46 { 47 *pmdp = pmd; 48 } 49 #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */ 50 51 void __init pagetable_init(void) 52 { 53 unsigned long vaddr; 54 pgd_t *pgd_base; 55 #ifdef CONFIG_HIGHMEM 56 pgd_t *pgd; 57 p4d_t *p4d; 58 pud_t *pud; 59 pmd_t *pmd; 60 pte_t *pte; 61 #endif 62 63 /* Initialize the entire pgd. */ 64 pgd_init((unsigned long)swapper_pg_dir); 65 pgd_init((unsigned long)swapper_pg_dir 66 + sizeof(pgd_t) * USER_PTRS_PER_PGD); 67 68 pgd_base = swapper_pg_dir; 69 70 /* 71 * Fixed mappings: 72 */ 73 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1); 74 fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base); 75 76 #ifdef CONFIG_HIGHMEM 77 /* 78 * Permanent kmaps: 79 */ 80 vaddr = PKMAP_BASE; 81 fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); 82 83 pgd = swapper_pg_dir + pgd_index(vaddr); 84 p4d = p4d_offset(pgd, vaddr); 85 pud = pud_offset(p4d, vaddr); 86 pmd = pmd_offset(pud, vaddr); 87 pte = pte_offset_kernel(pmd, vaddr); 88 pkmap_page_table = pte; 89 #endif 90 } 91