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
is_hugepage_only_range(struct mm_struct * mm,unsigned long addr,unsigned long len)14 static inline int is_hugepage_only_range(struct mm_struct *mm,
15 unsigned long addr,
16 unsigned long len)
17 {
18 return 0;
19 }
20
21 #define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
prepare_hugepage_range(struct file * file,unsigned long addr,unsigned long len)22 static 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
40 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
huge_ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)41 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
42 unsigned long addr, pte_t *ptep)
43 {
44 pte_t clear;
45 pte_t pte = *ptep;
46
47 pte_val(clear) = (unsigned long)invalid_pte_table;
48 set_pte_at(mm, addr, ptep, clear);
49 return pte;
50 }
51
52 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
huge_ptep_clear_flush(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep)53 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
54 unsigned long addr, pte_t *ptep)
55 {
56 flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
57 }
58
59 #define __HAVE_ARCH_HUGE_PTE_NONE
huge_pte_none(pte_t pte)60 static inline int huge_pte_none(pte_t pte)
61 {
62 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
63 return !val || (val == (unsigned long)invalid_pte_table);
64 }
65
66 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
huge_ptep_set_access_flags(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep,pte_t pte,int dirty)67 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
68 unsigned long addr,
69 pte_t *ptep, pte_t pte,
70 int dirty)
71 {
72 int changed = !pte_same(*ptep, pte);
73
74 if (changed) {
75 set_pte_at(vma->vm_mm, addr, ptep, pte);
76 /*
77 * There could be some standard sized pages in there,
78 * get them all.
79 */
80 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
81 }
82 return changed;
83 }
84
arch_clear_hugepage_flags(struct page * page)85 static inline void arch_clear_hugepage_flags(struct page *page)
86 {
87 }
88
89 #include <asm-generic/hugetlb.h>
90
91 #endif /* __ASM_HUGETLB_H */
92