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