| /* |
| * 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 <rohit.seth@intel.com> |
| * Copyright 2005, Embedded Alley Solutions, Inc. |
| * Matt Porter <mporter@embeddedalley.com> |
| * 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, unsigned long addr, |
| unsigned long sz) |
| { |
| pgd_t *pgd; |
| pud_t *pud; |
| pte_t *pte = NULL; |
| |
| pgd = pgd_offset(mm, addr); |
| pud = pud_alloc(mm, pgd, 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; |
| pud_t *pud; |
| pmd_t *pmd = NULL; |
| |
| pgd = pgd_offset(mm, addr); |
| if (pgd_present(*pgd)) { |
| pud = pud_offset(pgd, addr); |
| if (pud_present(*pud)) |
| pmd = pmd_offset(pud, addr); |
| } |
| return (pte_t *) pmd; |
| } |
| |
| /* |
| * This function checks for proper alignment of input addr and len parameters. |
| */ |
| int is_aligned_hugepage_range(unsigned long addr, unsigned long len) |
| { |
| if (len & ~HPAGE_MASK) |
| return -EINVAL; |
| if (addr & ~HPAGE_MASK) |
| return -EINVAL; |
| return 0; |
| } |
| |
| 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; |
| } |