| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1999, 2000 by Silicon Graphics |
| * Copyright (C) 2003 by Ralf Baechle |
| */ |
| #include <linux/export.h> |
| #include <linux/init.h> |
| #include <linux/mm.h> |
| #include <asm/fixmap.h> |
| #include <asm/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/tlbflush.h> |
| |
| void pgd_init(unsigned long page) |
| { |
| unsigned long *p, *end; |
| unsigned long entry; |
| |
| #ifdef __PAGETABLE_PMD_FOLDED |
| entry = (unsigned long)invalid_pte_table; |
| #else |
| entry = (unsigned long)invalid_pmd_table; |
| #endif |
| |
| p = (unsigned long *) page; |
| end = p + PTRS_PER_PGD; |
| |
| do { |
| p[0] = entry; |
| p[1] = entry; |
| p[2] = entry; |
| p[3] = entry; |
| p[4] = entry; |
| p += 8; |
| p[-3] = entry; |
| p[-2] = entry; |
| p[-1] = entry; |
| } while (p != end); |
| } |
| |
| #ifndef __PAGETABLE_PMD_FOLDED |
| void pmd_init(unsigned long addr, unsigned long pagetable) |
| { |
| unsigned long *p, *end; |
| |
| p = (unsigned long *) addr; |
| end = p + PTRS_PER_PMD; |
| |
| do { |
| p[0] = pagetable; |
| p[1] = pagetable; |
| p[2] = pagetable; |
| p[3] = pagetable; |
| p[4] = pagetable; |
| p += 8; |
| p[-3] = pagetable; |
| p[-2] = pagetable; |
| p[-1] = pagetable; |
| } while (p != end); |
| } |
| EXPORT_SYMBOL_GPL(pmd_init); |
| #endif |
| |
| pmd_t mk_pmd(struct page *page, pgprot_t prot) |
| { |
| pmd_t pmd; |
| |
| pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot); |
| |
| return pmd; |
| } |
| |
| void set_pmd_at(struct mm_struct *mm, unsigned long addr, |
| pmd_t *pmdp, pmd_t pmd) |
| { |
| *pmdp = pmd; |
| flush_tlb_all(); |
| } |
| |
| void __init pagetable_init(void) |
| { |
| unsigned long vaddr; |
| pgd_t *pgd_base; |
| |
| /* Initialize the entire pgd. */ |
| pgd_init((unsigned long)swapper_pg_dir); |
| #ifndef __PAGETABLE_PMD_FOLDED |
| pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table); |
| #endif |
| pgd_base = swapper_pg_dir; |
| /* |
| * Fixed mappings: |
| */ |
| vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; |
| fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base); |
| } |