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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/mm/pgtable-64.c
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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 1999, 2000 by Silicon Graphics

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 * Copyright (C) 2003 by Ralf Baechle

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 */

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#include <linux/export.h>

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#include <linux/init.h>

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#include <linux/mm.h>

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#include <asm/fixmap.h>

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#include <asm/pgalloc.h>

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#include <asm/tlbflush.h>

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void pgd_init(void *addr)

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{

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	unsigned long *p, *end;

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	unsigned long entry;

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#if !defined(__PAGETABLE_PUD_FOLDED)

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	entry = (unsigned long)invalid_pud_table;

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#elif !defined(__PAGETABLE_PMD_FOLDED)

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	entry = (unsigned long)invalid_pmd_table;

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#else

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	entry = (unsigned long)invalid_pte_table;

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#endif

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	p = (unsigned long *) addr;

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	end = p + PTRS_PER_PGD;

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	do {

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		p[0] = entry;

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		p[1] = entry;

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		p[2] = entry;

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		p[3] = entry;

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		p[4] = entry;

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		p += 8;

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		p[-3] = entry;

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		p[-2] = entry;

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		p[-1] = entry;

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	} while (p != end);

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}

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#ifndef __PAGETABLE_PMD_FOLDED

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void pmd_init(void *addr)

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{

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	unsigned long *p, *end;

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	unsigned long pagetable = (unsigned long)invalid_pte_table;

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	p = (unsigned long *)addr;

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	end = p + PTRS_PER_PMD;

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	do {

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		p[0] = pagetable;

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		p[1] = pagetable;

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		p[2] = pagetable;

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		p[3] = pagetable;

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		p[4] = pagetable;

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		p += 8;

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		p[-3] = pagetable;

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		p[-2] = pagetable;

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		p[-1] = pagetable;

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	} while (p != end);

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}

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EXPORT_SYMBOL_GPL(pmd_init);

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#endif

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#ifndef __PAGETABLE_PUD_FOLDED

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void pud_init(void *addr)

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{

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	unsigned long *p, *end;

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	unsigned long pagetable = (unsigned long)invalid_pmd_table;

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	p = (unsigned long *)addr;

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	end = p + PTRS_PER_PUD;

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	do {

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		p[0] = pagetable;

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		p[1] = pagetable;

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		p[2] = pagetable;

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		p[3] = pagetable;

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		p[4] = pagetable;

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		p += 8;

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		p[-3] = pagetable;

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		p[-2] = pagetable;

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		p[-1] = pagetable;

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	} while (p != end);

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}

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#endif

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#ifdef CONFIG_TRANSPARENT_HUGEPAGE

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void set_pmd_at(struct mm_struct *mm, unsigned long addr,

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		pmd_t *pmdp, pmd_t pmd)

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{

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	*pmdp = pmd;

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}

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#endif

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void __init pagetable_init(void)

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{

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	unsigned long vaddr;

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	pgd_t *pgd_base;

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	/* Initialize the entire pgd.  */

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	pgd_init(swapper_pg_dir);

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#ifndef __PAGETABLE_PUD_FOLDED

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	pud_init(invalid_pud_table);

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#endif

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#ifndef __PAGETABLE_PMD_FOLDED

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	pmd_init(invalid_pmd_table);

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#endif

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	pgd_base = swapper_pg_dir;

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	/*

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	 * Fixed mappings:

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	 */

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	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;

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	fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);

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}

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