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/pgtable.h> 14 #include <asm/pgalloc.h> 15 #include <asm/tlbflush.h> 16 17 void pgd_init(unsigned long page) 18 { 19 unsigned long *p, *end; 20 unsigned long entry; 21 22 #ifdef __PAGETABLE_PMD_FOLDED 23 entry = (unsigned long)invalid_pte_table; 24 #else 25 entry = (unsigned long)invalid_pmd_table; 26 #endif 27 28 p = (unsigned long *) page; 29 end = p + PTRS_PER_PGD; 30 31 do { 32 p[0] = entry; 33 p[1] = entry; 34 p[2] = entry; 35 p[3] = entry; 36 p[4] = entry; 37 p += 8; 38 p[-3] = entry; 39 p[-2] = entry; 40 p[-1] = entry; 41 } while (p != end); 42 } 43 44 #ifndef __PAGETABLE_PMD_FOLDED 45 void pmd_init(unsigned long addr, unsigned long pagetable) 46 { 47 unsigned long *p, *end; 48 49 p = (unsigned long *) addr; 50 end = p + PTRS_PER_PMD; 51 52 do { 53 p[0] = pagetable; 54 p[1] = pagetable; 55 p[2] = pagetable; 56 p[3] = pagetable; 57 p[4] = pagetable; 58 p += 8; 59 p[-3] = pagetable; 60 p[-2] = pagetable; 61 p[-1] = pagetable; 62 } while (p != end); 63 } 64 EXPORT_SYMBOL_GPL(pmd_init); 65 #endif 66 67 pmd_t mk_pmd(struct page *page, pgprot_t prot) 68 { 69 pmd_t pmd; 70 71 pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot); 72 73 return pmd; 74 } 75 76 void set_pmd_at(struct mm_struct *mm, unsigned long addr, 77 pmd_t *pmdp, pmd_t pmd) 78 { 79 *pmdp = pmd; 80 flush_tlb_all(); 81 } 82 83 void __init pagetable_init(void) 84 { 85 unsigned long vaddr; 86 pgd_t *pgd_base; 87 88 /* Initialize the entire pgd. */ 89 pgd_init((unsigned long)swapper_pg_dir); 90 #ifndef __PAGETABLE_PMD_FOLDED 91 pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table); 92 #endif 93 pgd_base = swapper_pg_dir; 94 /* 95 * Fixed mappings: 96 */ 97 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 98 fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base); 99 } 100