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- /*
- * MIPS Huge TLB Page Support for Kernel.
- *
- * 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) 2002, Rohit Seth <[email protected]>
- * Copyright 2005, Embedded Alley Solutions, Inc.
- * Matt Porter <[email protected]>
- * Copyright (C) 2008, 2009 Cavium Networks, Inc.
- */
- #include <linux/fs.h>
- #include <linux/mm.h>
- #include <linux/hugetlb.h>
- #include <linux/pagemap.h>
- #include <linux/err.h>
- #include <linux/sysctl.h>
- #include <asm/mman.h>
- #include <asm/tlb.h>
- #include <asm/tlbflush.h>
- pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, unsigned long sz)
- {
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
- pte_t *pte = NULL;
- pgd = pgd_offset(mm, addr);
- p4d = p4d_alloc(mm, pgd, addr);
- pud = pud_alloc(mm, p4d, addr);
- if (pud)
- pte = (pte_t *)pmd_alloc(mm, pud, addr);
- return pte;
- }
- pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
- unsigned long sz)
- {
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd = NULL;
- pgd = pgd_offset(mm, addr);
- if (pgd_present(*pgd)) {
- p4d = p4d_offset(pgd, addr);
- if (p4d_present(*p4d)) {
- pud = pud_offset(p4d, addr);
- if (pud_present(*pud))
- pmd = pmd_offset(pud, addr);
- }
- }
- return (pte_t *) pmd;
- }
- int pmd_huge(pmd_t pmd)
- {
- return (pmd_val(pmd) & _PAGE_HUGE) != 0;
- }
- int pud_huge(pud_t pud)
- {
- return (pud_val(pud) & _PAGE_HUGE) != 0;
- }
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