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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/mm/pgtable-32.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) 2003 by Ralf Baechle

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 */

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#include <linux/init.h>

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#include <linux/mm.h>

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#include <linux/memblock.h>

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#include <linux/highmem.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 = (unsigned long *)addr;

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	int i;

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	for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {

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		p[i + 0] = (unsigned long) invalid_pte_table;

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		p[i + 1] = (unsigned long) invalid_pte_table;

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		p[i + 2] = (unsigned long) invalid_pte_table;

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		p[i + 3] = (unsigned long) invalid_pte_table;

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		p[i + 4] = (unsigned long) invalid_pte_table;

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		p[i + 5] = (unsigned long) invalid_pte_table;

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		p[i + 6] = (unsigned long) invalid_pte_table;

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		p[i + 7] = (unsigned long) invalid_pte_table;

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	}

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}

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#if defined(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 /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */

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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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#ifdef CONFIG_HIGHMEM

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	pgd_t *pgd;

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	p4d_t *p4d;

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	pud_t *pud;

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	pmd_t *pmd;

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	pte_t *pte;

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#endif

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	/* Initialize the entire pgd.  */

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	pgd_init(swapper_pg_dir);

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	pgd_init(&swapper_pg_dir[USER_PTRS_PER_PGD]);

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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);

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	fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);

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#ifdef CONFIG_HIGHMEM

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	/*

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	 * Permanent kmaps:

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	 */

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	vaddr = PKMAP_BASE;

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	fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);

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	pgd = swapper_pg_dir + pgd_index(vaddr);

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	p4d = p4d_offset(pgd, vaddr);

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	pud = pud_offset(p4d, vaddr);

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	pmd = pmd_offset(pud, vaddr);

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	pte = pte_offset_kernel(pmd, vaddr);

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	pkmap_page_table = pte;

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#endif

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}

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