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Diffstat (limited to 'arch/mips/mm/hugetlbpage.c')
-rw-r--r-- | arch/mips/mm/hugetlbpage.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/mips/mm/hugetlbpage.c b/arch/mips/mm/hugetlbpage.c new file mode 100644 index 000000000000..8c2834f5919d --- /dev/null +++ b/arch/mips/mm/hugetlbpage.c @@ -0,0 +1,100 @@ +/* + * 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/init.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/hugetlb.h> +#include <linux/pagemap.h> +#include <linux/slab.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) +{ + 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; +} + +int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) +{ + return 0; +} + +/* + * 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; +} + +struct page * +follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) +{ + return ERR_PTR(-EINVAL); +} + +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; +} + +struct page * +follow_huge_pmd(struct mm_struct *mm, unsigned long address, + pmd_t *pmd, int write) +{ + struct page *page; + + page = pte_page(*(pte_t *)pmd); + if (page) + page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT); + return page; +} + |