xref: /linux/arch/s390/include/asm/hugetlb.h (revision 005438a8eef063495ac059d128eea71b58de50e5) 
1 /*
2  *  IBM System z Huge TLB Page Support for Kernel.
3  *
4  *    Copyright IBM Corp. 2008
5  *    Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
6  */
7 
8 #ifndef _ASM_S390_HUGETLB_H
9 #define _ASM_S390_HUGETLB_H
10 
11 #include <asm/page.h>
12 #include <asm/pgtable.h>
13 
14 
15 #define is_hugepage_only_range(mm, addr, len)	0
16 #define hugetlb_free_pgd_range			free_pgd_range
17 
18 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 		     pte_t *ptep, pte_t pte);
20 pte_t huge_ptep_get(pte_t *ptep);
21 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
22 			      unsigned long addr, pte_t *ptep);
23 
24 /*
25  * If the arch doesn't supply something else, assume that hugepage
26  * size aligned regions are ok without further preparation.
27  */
28 static inline int prepare_hugepage_range(struct file *file,
29 			unsigned long addr, unsigned long len)
30 {
31 	if (len & ~HPAGE_MASK)
32 		return -EINVAL;
33 	if (addr & ~HPAGE_MASK)
34 		return -EINVAL;
35 	return 0;
36 }
37 
38 #define arch_clear_hugepage_flags(page)		do { } while (0)
39 
40 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
41 				  pte_t *ptep)
42 {
43 	pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
44 }
45 
46 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
47 					 unsigned long address, pte_t *ptep)
48 {
49 	huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
50 }
51 
52 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
53 					     unsigned long addr, pte_t *ptep,
54 					     pte_t pte, int dirty)
55 {
56 	int changed = !pte_same(huge_ptep_get(ptep), pte);
57 	if (changed) {
58 		huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
59 		set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
60 	}
61 	return changed;
62 }
63 
64 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
65 					   unsigned long addr, pte_t *ptep)
66 {
67 	pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
68 	set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
69 }
70 
71 static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
72 {
73 	return mk_pte(page, pgprot);
74 }
75 
76 static inline int huge_pte_none(pte_t pte)
77 {
78 	return pte_none(pte);
79 }
80 
81 static inline int huge_pte_write(pte_t pte)
82 {
83 	return pte_write(pte);
84 }
85 
86 static inline int huge_pte_dirty(pte_t pte)
87 {
88 	return pte_dirty(pte);
89 }
90 
91 static inline pte_t huge_pte_mkwrite(pte_t pte)
92 {
93 	return pte_mkwrite(pte);
94 }
95 
96 static inline pte_t huge_pte_mkdirty(pte_t pte)
97 {
98 	return pte_mkdirty(pte);
99 }
100 
101 static inline pte_t huge_pte_wrprotect(pte_t pte)
102 {
103 	return pte_wrprotect(pte);
104 }
105 
106 static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
107 {
108 	return pte_modify(pte, newprot);
109 }
110 
111 #endif /* _ASM_S390_HUGETLB_H */
112