1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 2008, 2009 Cavium Networks, Inc.
  7 */
  8
  9#ifndef __ASM_HUGETLB_H
 10#define __ASM_HUGETLB_H
 11
 12#include <asm/page.h>
 13
 14
 15static inline int is_hugepage_only_range(struct mm_struct *mm,
 16					 unsigned long addr,
 17					 unsigned long len)
 18{
 19	return 0;
 20}
 21
 22static inline int prepare_hugepage_range(struct file *file,
 23					 unsigned long addr,
 24					 unsigned long len)
 25{
 26	unsigned long task_size = STACK_TOP;
 27	struct hstate *h = hstate_file(file);
 28
 29	if (len & ~huge_page_mask(h))
 30		return -EINVAL;
 31	if (addr & ~huge_page_mask(h))
 32		return -EINVAL;
 33	if (len > task_size)
 34		return -ENOMEM;
 35	if (task_size - len < addr)
 36		return -EINVAL;
 37	return 0;
 38}
 39
 40static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
 41{
 42}
 43
 44static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
 45					  unsigned long addr,
 46					  unsigned long end,
 47					  unsigned long floor,
 48					  unsigned long ceiling)
 49{
 50	free_pgd_range(tlb, addr, end, floor, ceiling);
 51}
 52
 53static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 54				   pte_t *ptep, pte_t pte)
 55{
 56	set_pte_at(mm, addr, ptep, pte);
 57}
 58
 59static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 60					    unsigned long addr, pte_t *ptep)
 61{
 62	pte_t clear;
 63	pte_t pte = *ptep;
 64
 65	pte_val(clear) = (unsigned long)invalid_pte_table;
 66	set_pte_at(mm, addr, ptep, clear);
 67	return pte;
 68}
 69
 70static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
 71					 unsigned long addr, pte_t *ptep)
 72{
 73	flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
 74}
 75
 76static inline int huge_pte_none(pte_t pte)
 77{
 78	unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
 79	return !val || (val == (unsigned long)invalid_pte_table);
 80}
 81
 82static inline pte_t huge_pte_wrprotect(pte_t pte)
 83{
 84	return pte_wrprotect(pte);
 85}
 86
 87static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 88					   unsigned long addr, pte_t *ptep)
 89{
 90	ptep_set_wrprotect(mm, addr, ptep);
 91}
 92
 93static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 94					     unsigned long addr,
 95					     pte_t *ptep, pte_t pte,
 96					     int dirty)
 97{
 98	return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
 99}
100
101static inline pte_t huge_ptep_get(pte_t *ptep)
102{
103	return *ptep;
104}
105
106static inline int arch_prepare_hugepage(struct page *page)
107{
108	return 0;
109}
110
111static inline void arch_release_hugepage(struct page *page)
112{
113}
114
115#endif /* __ASM_HUGETLB_H */