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/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 = (unsigned long *) page; 20 int i; 21 22 for (i = 0; i < USER_PTRS_PER_PGD; i+=8) { 23 p[i + 0] = (unsigned long) invalid_pte_table; 24 p[i + 1] = (unsigned long) invalid_pte_table; 25 p[i + 2] = (unsigned long) invalid_pte_table; 26 p[i + 3] = (unsigned long) invalid_pte_table; 27 p[i + 4] = (unsigned long) invalid_pte_table; 28 p[i + 5] = (unsigned long) invalid_pte_table; 29 p[i + 6] = (unsigned long) invalid_pte_table; 30 p[i + 7] = (unsigned long) invalid_pte_table; 31 } 32 } 33 34 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) 35 pmd_t mk_pmd(struct page *page, pgprot_t prot) 36 { 37 pmd_t pmd; 38 39 pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot); 40 41 return pmd; 42 } 43 44 45 void set_pmd_at(struct mm_struct *mm, unsigned long addr, 46 pmd_t *pmdp, pmd_t pmd) 47 { 48 *pmdp = pmd; 49 flush_tlb_all(); 50 } 51 #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */ 52 53 void __init pagetable_init(void) 54 { 55 unsigned long vaddr; 56 pgd_t *pgd_base; 57 #ifdef CONFIG_HIGHMEM 58 pgd_t *pgd; 59 p4d_t *p4d; 60 pud_t *pud; 61 pmd_t *pmd; 62 pte_t *pte; 63 #endif 64 65 /* Initialize the entire pgd. */ 66 pgd_init((unsigned long)swapper_pg_dir); 67 pgd_init((unsigned long)swapper_pg_dir 68 + sizeof(pgd_t) * USER_PTRS_PER_PGD); 69 70 pgd_base = swapper_pg_dir; 71 72 /* 73 * Fixed mappings: 74 */ 75 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1); 76 fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base); 77 78 #ifdef CONFIG_HIGHMEM 79 /* 80 * Permanent kmaps: 81 */ 82 vaddr = PKMAP_BASE; 83 fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); 84 85 pgd = swapper_pg_dir + pgd_index(vaddr); 86 p4d = p4d_offset(pgd, vaddr); 87 pud = pud_offset(p4d, vaddr); 88 pmd = pmd_offset(pud, vaddr); 89 pte = pte_offset_kernel(pmd, vaddr); 90 pkmap_page_table = pte; 91 #endif 92 } 93