102 строки
1.8 KiB
C
102 строки
1.8 KiB
C
/*
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* arch/sh64/mm/hugetlbpage.c
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*
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* SuperH HugeTLB page support.
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*
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* Cloned from sparc64 by Paul Mundt.
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*
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* Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
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*/
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/smp_lock.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <asm/mman.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
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{
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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if (pgd) {
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pmd = pmd_alloc(mm, pgd, addr);
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if (pmd)
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pte = pte_alloc_map(mm, pmd, addr);
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}
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return pte;
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}
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
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{
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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if (pgd) {
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pmd = pmd_offset(pgd, addr);
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if (pmd)
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pte = pte_offset_map(pmd, addr);
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}
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return pte;
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}
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t entry)
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{
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int i;
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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set_pte_at(mm, addr, ptep, entry);
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ptep++;
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addr += PAGE_SIZE;
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pte_val(entry) += PAGE_SIZE;
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}
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}
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_t entry;
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int i;
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entry = *ptep;
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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pte_clear(mm, addr, ptep);
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addr += PAGE_SIZE;
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ptep++;
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}
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return entry;
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}
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struct page *follow_huge_addr(struct mm_struct *mm,
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unsigned long address, int write)
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{
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return ERR_PTR(-EINVAL);
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}
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int pmd_huge(pmd_t pmd)
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{
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return 0;
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}
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd, int write)
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{
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return NULL;
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}
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