1/* 2 * arch/sh/mm/hugetlbpage.c 3 * 4 * SuperH HugeTLB page support. 5 * 6 * Cloned from sparc64 by Paul Mundt. 7 * 8 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com) 9 */ 10 11#include <linux/init.h> 12#include <linux/fs.h> 13#include <linux/mm.h> 14#include <linux/hugetlb.h> 15#include <linux/pagemap.h> 16#include <linux/slab.h> 17#include <linux/sysctl.h> 18 19#include <asm/mman.h> 20#include <asm/pgalloc.h> 21#include <asm/tlb.h> 22#include <asm/tlbflush.h> 23#include <asm/cacheflush.h> 24 25pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) 26{ 27 pgd_t *pgd; 28 pud_t *pud; 29 pmd_t *pmd; 30 pte_t *pte = NULL; 31 32 pgd = pgd_offset(mm, addr); 33 if (pgd) { 34 pud = pud_alloc(mm, pgd, addr); 35 if (pud) { 36 pmd = pmd_alloc(mm, pud, addr); 37 if (pmd) 38 pte = pte_alloc_map(mm, pmd, addr); 39 } 40 } 41 42 return pte; 43} 44 45pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) 46{ 47 pgd_t *pgd; 48 pud_t *pud; 49 pmd_t *pmd; 50 pte_t *pte = NULL; 51 52 pgd = pgd_offset(mm, addr); 53 if (pgd) { 54 pud = pud_offset(pgd, addr); 55 if (pud) { 56 pmd = pmd_offset(pud, addr); 57 if (pmd) 58 pte = pte_offset_map(pmd, addr); 59 } 60 } 61 62 return pte; 63} 64 65int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) 66{ 67 return 0; 68} 69 70struct page *follow_huge_addr(struct mm_struct *mm, 71 unsigned long address, int write) 72{ 73 return ERR_PTR(-EINVAL); 74} 75 76int pmd_huge(pmd_t pmd) 77{ 78 return 0; 79} 80 81struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 82 pmd_t *pmd, int write) 83{ 84 return NULL; 85} 86