150a41ff2SDavid Daney /*
250a41ff2SDavid Daney * MIPS Huge TLB Page Support for Kernel.
350a41ff2SDavid Daney *
450a41ff2SDavid Daney * This file is subject to the terms and conditions of the GNU General Public
550a41ff2SDavid Daney * License. See the file "COPYING" in the main directory of this archive
650a41ff2SDavid Daney * for more details.
750a41ff2SDavid Daney *
850a41ff2SDavid Daney * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
950a41ff2SDavid Daney * Copyright 2005, Embedded Alley Solutions, Inc.
1050a41ff2SDavid Daney * Matt Porter <mporter@embeddedalley.com>
1150a41ff2SDavid Daney * Copyright (C) 2008, 2009 Cavium Networks, Inc.
1250a41ff2SDavid Daney */
1350a41ff2SDavid Daney
1450a41ff2SDavid Daney #include <linux/fs.h>
1550a41ff2SDavid Daney #include <linux/mm.h>
1650a41ff2SDavid Daney #include <linux/hugetlb.h>
1750a41ff2SDavid Daney #include <linux/pagemap.h>
1850a41ff2SDavid Daney #include <linux/err.h>
1950a41ff2SDavid Daney #include <linux/sysctl.h>
2050a41ff2SDavid Daney #include <asm/mman.h>
2150a41ff2SDavid Daney #include <asm/tlb.h>
2250a41ff2SDavid Daney #include <asm/tlbflush.h>
2350a41ff2SDavid Daney
huge_pte_alloc(struct mm_struct * mm,struct vm_area_struct * vma,unsigned long addr,unsigned long sz)24*aec44e0fSPeter Xu pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
25*aec44e0fSPeter Xu unsigned long addr, unsigned long sz)
2650a41ff2SDavid Daney {
2750a41ff2SDavid Daney pgd_t *pgd;
282bee1b58SMike Rapoport p4d_t *p4d;
2950a41ff2SDavid Daney pud_t *pud;
3050a41ff2SDavid Daney pte_t *pte = NULL;
3150a41ff2SDavid Daney
3250a41ff2SDavid Daney pgd = pgd_offset(mm, addr);
332bee1b58SMike Rapoport p4d = p4d_alloc(mm, pgd, addr);
342bee1b58SMike Rapoport pud = pud_alloc(mm, p4d, addr);
3550a41ff2SDavid Daney if (pud)
3650a41ff2SDavid Daney pte = (pte_t *)pmd_alloc(mm, pud, addr);
3750a41ff2SDavid Daney
3850a41ff2SDavid Daney return pte;
3950a41ff2SDavid Daney }
4050a41ff2SDavid Daney
huge_pte_offset(struct mm_struct * mm,unsigned long addr,unsigned long sz)417868a208SPunit Agrawal pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
427868a208SPunit Agrawal unsigned long sz)
4350a41ff2SDavid Daney {
4450a41ff2SDavid Daney pgd_t *pgd;
452bee1b58SMike Rapoport p4d_t *p4d;
4650a41ff2SDavid Daney pud_t *pud;
4750a41ff2SDavid Daney pmd_t *pmd = NULL;
4850a41ff2SDavid Daney
4950a41ff2SDavid Daney pgd = pgd_offset(mm, addr);
5050a41ff2SDavid Daney if (pgd_present(*pgd)) {
512bee1b58SMike Rapoport p4d = p4d_offset(pgd, addr);
522bee1b58SMike Rapoport if (p4d_present(*p4d)) {
532bee1b58SMike Rapoport pud = pud_offset(p4d, addr);
5450a41ff2SDavid Daney if (pud_present(*pud))
5550a41ff2SDavid Daney pmd = pmd_offset(pud, addr);
5650a41ff2SDavid Daney }
572bee1b58SMike Rapoport }
5850a41ff2SDavid Daney return (pte_t *) pmd;
5950a41ff2SDavid Daney }
6050a41ff2SDavid Daney
pmd_huge(pmd_t pmd)6150a41ff2SDavid Daney int pmd_huge(pmd_t pmd)
6250a41ff2SDavid Daney {
6350a41ff2SDavid Daney return (pmd_val(pmd) & _PAGE_HUGE) != 0;
6450a41ff2SDavid Daney }
6550a41ff2SDavid Daney
pud_huge(pud_t pud)6650a41ff2SDavid Daney int pud_huge(pud_t pud)
6750a41ff2SDavid Daney {
6850a41ff2SDavid Daney return (pud_val(pud) & _PAGE_HUGE) != 0;
6950a41ff2SDavid Daney }
70