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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
18void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t pte);
20
21
22
23
24
25static inline int prepare_hugepage_range(struct file *file,
26 unsigned long addr, unsigned long len)
27{
28 if (len & ~HPAGE_MASK)
29 return -EINVAL;
30 if (addr & ~HPAGE_MASK)
31 return -EINVAL;
32 return 0;
33}
34
35#define hugetlb_prefault_arch_hook(mm) do { } while (0)
36
37int arch_prepare_hugepage(struct page *page);
38void arch_release_hugepage(struct page *page);
39
40static inline pte_t huge_pte_wrprotect(pte_t pte)
41{
42 pte_val(pte) |= _PAGE_RO;
43 return pte;
44}
45
46static inline int huge_pte_none(pte_t pte)
47{
48 return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
49 !(pte_val(pte) & _SEGMENT_ENTRY_RO);
50}
51
52static inline pte_t huge_ptep_get(pte_t *ptep)
53{
54 pte_t pte = *ptep;
55 unsigned long mask;
56
57 if (!MACHINE_HAS_HPAGE) {
58 ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
59 if (ptep) {
60 mask = pte_val(pte) &
61 (_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
62 pte = pte_mkhuge(*ptep);
63 pte_val(pte) |= mask;
64 }
65 }
66 return pte;
67}
68
69static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
70 unsigned long addr, pte_t *ptep)
71{
72 pte_t pte = huge_ptep_get(ptep);
73
74 mm->context.flush_mm = 1;
75 pmd_clear((pmd_t *) ptep);
76 return pte;
77}
78
79static inline void __pmd_csp(pmd_t *pmdp)
80{
81 register unsigned long reg2 asm("2") = pmd_val(*pmdp);
82 register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
83 _SEGMENT_ENTRY_INV;
84 register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
85
86 asm volatile(
87 " csp %1,%3"
88 : "=m" (*pmdp)
89 : "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
90 pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
91}
92
93static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
94{
95 unsigned long sto = (unsigned long) pmdp -
96 pmd_index(address) * sizeof(pmd_t);
97
98 if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
99 asm volatile(
100 " .insn rrf,0xb98e0000,%2,%3,0,0"
101 : "=m" (*pmdp)
102 : "m" (*pmdp), "a" (sto),
103 "a" ((address & HPAGE_MASK))
104 );
105 }
106 pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
107}
108
109static inline void huge_ptep_invalidate(struct mm_struct *mm,
110 unsigned long address, pte_t *ptep)
111{
112 pmd_t *pmdp = (pmd_t *) ptep;
113
114 if (!MACHINE_HAS_IDTE) {
115 __pmd_csp(pmdp);
116 if (mm->context.noexec) {
117 pmdp = get_shadow_table(pmdp);
118 __pmd_csp(pmdp);
119 }
120 return;
121 }
122
123 __pmd_idte(address, pmdp);
124 if (mm->context.noexec) {
125 pmdp = get_shadow_table(pmdp);
126 __pmd_idte(address, pmdp);
127 }
128 return;
129}
130
131#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
132({ \
133 int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
134 if (__changed) { \
135 huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
136 set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
137 } \
138 __changed; \
139})
140
141#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
142({ \
143 pte_t __pte = huge_ptep_get(__ptep); \
144 if (pte_write(__pte)) { \
145 (__mm)->context.flush_mm = 1; \
146 if (atomic_read(&(__mm)->context.attach_count) > 1 || \
147 (__mm) != current->active_mm) \
148 huge_ptep_invalidate(__mm, __addr, __ptep); \
149 set_huge_pte_at(__mm, __addr, __ptep, \
150 huge_pte_wrprotect(__pte)); \
151 } \
152})
153
154static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
155 unsigned long address, pte_t *ptep)
156{
157 huge_ptep_invalidate(vma->vm_mm, address, ptep);
158}
159
160#endif
161
