hugetlb.h

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/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

#ifndef _ASM_TILE_HUGETLB_H
#define _ASM_TILE_HUGETLB_H

#include <asm/page.h>


static inline int is_hugepage_only_range(struct mm_struct *mm,
                     unsigned long addr,
                     unsigned long len) {
    return 0;
}

/*
 * If the arch doesn't supply something else, assume that hugepage
 * size aligned regions are ok without further preparation.
 */
static inline int prepare_hugepage_range(struct file *file,
                     unsigned long addr, unsigned long len)
{
    struct hstate *h = hstate_file(file);
    if (len & ~huge_page_mask(h))
        return -EINVAL;
    if (addr & ~huge_page_mask(h))
        return -EINVAL;
    return 0;
}

static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
{
}

static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
                      unsigned long addr, unsigned long end,
                      unsigned long floor,
                      unsigned long ceiling)
{
    free_pgd_range(tlb, addr, end, floor, ceiling);
}

static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
                   pte_t *ptep, pte_t pte)
{
    set_pte(ptep, pte);
}

static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
                        unsigned long addr, pte_t *ptep)
{
    return ptep_get_and_clear(mm, addr, ptep);
}

static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
                     unsigned long addr, pte_t *ptep)
{
    ptep_clear_flush(vma, addr, ptep);
}

static inline int huge_pte_none(pte_t pte)
{
    return pte_none(pte);
}

static inline pte_t huge_pte_wrprotect(pte_t pte)
{
    return pte_wrprotect(pte);
}

static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
                       unsigned long addr, pte_t *ptep)
{
    ptep_set_wrprotect(mm, addr, ptep);
}

static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
                         unsigned long addr, pte_t *ptep,
                         pte_t pte, int dirty)
{
    return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
}

static inline pte_t huge_ptep_get(pte_t *ptep)
{
    return *ptep;
}

static inline int arch_prepare_hugepage(struct page *page)
{
    return 0;
}

static inline void arch_release_hugepage(struct page *page)
{
}

static inline void arch_clear_hugepage_flags(struct page *page)
{
}

#ifdef CONFIG_HUGETLB_SUPER_PAGES
static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
                       struct page *page, int writable)
{
    size_t pagesize = huge_page_size(hstate_vma(vma));
    if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
        entry = pte_mksuper(entry);
    return entry;
}
#define arch_make_huge_pte arch_make_huge_pte

/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
enum {
    HUGE_SHIFT_PGDIR = 0,
    HUGE_SHIFT_PMD = 1,
    HUGE_SHIFT_PAGE = 2,
    HUGE_SHIFT_ENTRIES
};
extern int huge_shift[HUGE_SHIFT_ENTRIES];
#endif

#endif /* _ASM_TILE_HUGETLB_H */