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) 1999, 2000 by Silicon Graphics 7 * Copyright (C) 2003 by Ralf Baechle 8 */ 9 #include <linux/export.h> 10 #include <linux/init.h> 11 #include <linux/mm.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, *end; 19 unsigned long entry; 20 21 #if !defined(__PAGETABLE_PUD_FOLDED) 22 entry = (unsigned long)invalid_pud_table; 23 #elif !defined(__PAGETABLE_PMD_FOLDED) 24 entry = (unsigned long)invalid_pmd_table; 25 #else 26 entry = (unsigned long)invalid_pte_table; 27 #endif 28 29 p = (unsigned long *) page; 30 end = p + PTRS_PER_PGD; 31 32 do { 33 p[0] = entry; 34 p[1] = entry; 35 p[2] = entry; 36 p[3] = entry; 37 p[4] = entry; 38 p += 8; 39 p[-3] = entry; 40 p[-2] = entry; 41 p[-1] = entry; 42 } while (p != end); 43 } 44 45 #ifndef __PAGETABLE_PMD_FOLDED 46 void pmd_init(unsigned long addr, unsigned long pagetable) 47 { 48 unsigned long *p, *end; 49 50 p = (unsigned long *) addr; 51 end = p + PTRS_PER_PMD; 52 53 do { 54 p[0] = pagetable; 55 p[1] = pagetable; 56 p[2] = pagetable; 57 p[3] = pagetable; 58 p[4] = pagetable; 59 p += 8; 60 p[-3] = pagetable; 61 p[-2] = pagetable; 62 p[-1] = pagetable; 63 } while (p != end); 64 } 65 EXPORT_SYMBOL_GPL(pmd_init); 66 #endif 67 68 #ifndef __PAGETABLE_PUD_FOLDED 69 void pud_init(unsigned long addr, unsigned long pagetable) 70 { 71 unsigned long *p, *end; 72 73 p = (unsigned long *)addr; 74 end = p + PTRS_PER_PUD; 75 76 do { 77 p[0] = pagetable; 78 p[1] = pagetable; 79 p[2] = pagetable; 80 p[3] = pagetable; 81 p[4] = pagetable; 82 p += 8; 83 p[-3] = pagetable; 84 p[-2] = pagetable; 85 p[-1] = pagetable; 86 } while (p != end); 87 } 88 #endif 89 90 pmd_t mk_pmd(struct page *page, pgprot_t prot) 91 { 92 pmd_t pmd; 93 94 pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot); 95 96 return pmd; 97 } 98 99 void set_pmd_at(struct mm_struct *mm, unsigned long addr, 100 pmd_t *pmdp, pmd_t pmd) 101 { 102 *pmdp = pmd; 103 } 104 105 void __init pagetable_init(void) 106 { 107 unsigned long vaddr; 108 pgd_t *pgd_base; 109 110 /* Initialize the entire pgd. */ 111 pgd_init((unsigned long)swapper_pg_dir); 112 #ifndef __PAGETABLE_PUD_FOLDED 113 pud_init((unsigned long)invalid_pud_table, (unsigned long)invalid_pmd_table); 114 #endif 115 #ifndef __PAGETABLE_PMD_FOLDED 116 pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table); 117 #endif 118 pgd_base = swapper_pg_dir; 119 /* 120 * Fixed mappings: 121 */ 122 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 123 fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base); 124 } 125