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 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
huge_ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep,unsigned long sz)15 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
16 unsigned long addr, pte_t *ptep,
17 unsigned long sz)
18 {
19 pte_t clear;
20 pte_t pte = *ptep;
21
22 pte_val(clear) = (unsigned long)invalid_pte_table;
23 set_pte_at(mm, addr, ptep, clear);
24 return pte;
25 }
26
27 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
huge_ptep_clear_flush(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep)28 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
29 unsigned long addr, pte_t *ptep)
30 {
31 pte_t pte;
32 unsigned long sz = huge_page_size(hstate_vma(vma));
33
34 /*
35 * clear the huge pte entry firstly, so that the other smp threads will
36 * not get old pte entry after finishing flush_tlb_page and before
37 * setting new huge pte entry
38 */
39 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep, sz);
40 flush_tlb_page(vma, addr);
41 return pte;
42 }
43
44 #define __HAVE_ARCH_HUGE_PTE_NONE
huge_pte_none(pte_t pte)45 static inline int huge_pte_none(pte_t pte)
46 {
47 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
48 return !val || (val == (unsigned long)invalid_pte_table);
49 }
50
51 #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)52 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
53 unsigned long addr,
54 pte_t *ptep, pte_t pte,
55 int dirty)
56 {
57 int changed = !pte_same(*ptep, pte);
58
59 if (changed) {
60 set_pte_at(vma->vm_mm, addr, ptep, pte);
61 /*
62 * There could be some standard sized pages in there,
63 * get them all.
64 */
65 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
66 }
67 return changed;
68 }
69
70 #include <asm-generic/hugetlb.h>
71
72 #endif /* __ASM_HUGETLB_H */
73