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/init.h> 10 #include <linux/mm.h> 11 #include <asm/fixmap.h> 12 #include <asm/pgtable.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 #ifdef __PAGETABLE_PMD_FOLDED 22 entry = (unsigned long)invalid_pte_table; 23 #else 24 entry = (unsigned long)invalid_pmd_table; 25 #endif 26 27 p = (unsigned long *) page; 28 end = p + PTRS_PER_PGD; 29 30 do { 31 p[0] = entry; 32 p[1] = entry; 33 p[2] = entry; 34 p[3] = entry; 35 p[4] = entry; 36 p += 8; 37 p[-3] = entry; 38 p[-2] = entry; 39 p[-1] = entry; 40 } while (p != end); 41 } 42 43 #ifndef __PAGETABLE_PMD_FOLDED 44 void pmd_init(unsigned long addr, unsigned long pagetable) 45 { 46 unsigned long *p, *end; 47 48 p = (unsigned long *) addr; 49 end = p + PTRS_PER_PMD; 50 51 do { 52 p[0] = pagetable; 53 p[1] = pagetable; 54 p[2] = pagetable; 55 p[3] = pagetable; 56 p[4] = pagetable; 57 p += 8; 58 p[-3] = pagetable; 59 p[-2] = pagetable; 60 p[-1] = pagetable; 61 } while (p != end); 62 } 63 #endif 64 65 pmd_t mk_pmd(struct page *page, pgprot_t prot) 66 { 67 pmd_t pmd; 68 69 pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot); 70 71 return pmd; 72 } 73 74 void set_pmd_at(struct mm_struct *mm, unsigned long addr, 75 pmd_t *pmdp, pmd_t pmd) 76 { 77 *pmdp = pmd; 78 flush_tlb_all(); 79 } 80 81 void __init pagetable_init(void) 82 { 83 unsigned long vaddr; 84 pgd_t *pgd_base; 85 86 /* Initialize the entire pgd. */ 87 pgd_init((unsigned long)swapper_pg_dir); 88 #ifndef __PAGETABLE_PMD_FOLDED 89 pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table); 90 #endif 91 pgd_base = swapper_pg_dir; 92 /* 93 * Fixed mappings: 94 */ 95 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 96 fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base); 97 } 98