1 /* 2 * MIPS Huge TLB Page Support for Kernel. 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> 9 * Copyright 2005, Embedded Alley Solutions, Inc. 10 * Matt Porter <mporter@embeddedalley.com> 11 * Copyright (C) 2008, 2009 Cavium Networks, Inc. 12 */ 13 14 #include <linux/fs.h> 15 #include <linux/mm.h> 16 #include <linux/hugetlb.h> 17 #include <linux/pagemap.h> 18 #include <linux/err.h> 19 #include <linux/sysctl.h> 20 #include <asm/mman.h> 21 #include <asm/tlb.h> 22 #include <asm/tlbflush.h> 23 24 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, 25 unsigned long addr, unsigned long sz) 26 { 27 pgd_t *pgd; 28 p4d_t *p4d; 29 pud_t *pud; 30 pte_t *pte = NULL; 31 32 pgd = pgd_offset(mm, addr); 33 p4d = p4d_alloc(mm, pgd, addr); 34 pud = pud_alloc(mm, p4d, addr); 35 if (pud) 36 pte = (pte_t *)pmd_alloc(mm, pud, addr); 37 38 return pte; 39 } 40 41 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, 42 unsigned long sz) 43 { 44 pgd_t *pgd; 45 p4d_t *p4d; 46 pud_t *pud; 47 pmd_t *pmd = NULL; 48 49 pgd = pgd_offset(mm, addr); 50 if (pgd_present(*pgd)) { 51 p4d = p4d_offset(pgd, addr); 52 if (p4d_present(*p4d)) { 53 pud = pud_offset(p4d, addr); 54 if (pud_present(*pud)) 55 pmd = pmd_offset(pud, addr); 56 } 57 } 58 return (pte_t *) pmd; 59 } 60 61 int pmd_huge(pmd_t pmd) 62 { 63 return (pmd_val(pmd) & _PAGE_HUGE) != 0; 64 } 65 66 int pud_huge(pud_t pud) 67 { 68 return (pud_val(pud) & _PAGE_HUGE) != 0; 69 } 70