4 * Derived from "include/asm-i386/mmu_context.h"
7 #ifndef __S390_MMU_CONTEXT_H
8 #define __S390_MMU_CONTEXT_H
10 #include <asm/pgalloc.h>
11 #include <asm/uaccess.h>
12 #include <asm/tlbflush.h>
13 #include <asm/ctl_reg.h>
15 static inline int init_new_context(struct task_struct
*tsk
,
18 spin_lock_init(&mm
->context
.pgtable_lock
);
19 INIT_LIST_HEAD(&mm
->context
.pgtable_list
);
20 spin_lock_init(&mm
->context
.gmap_lock
);
21 INIT_LIST_HEAD(&mm
->context
.gmap_list
);
22 cpumask_clear(&mm
->context
.cpu_attach_mask
);
23 atomic_set(&mm
->context
.flush_count
, 0);
24 mm
->context
.flush_mm
= 0;
26 mm
->context
.alloc_pgste
= page_table_allocate_pgste
;
27 mm
->context
.has_pgste
= 0;
28 mm
->context
.use_skey
= 0;
30 switch (mm
->context
.asce_limit
) {
33 * forked 3-level task, fall through to set new asce with new
37 /* context created by exec, set asce limit to 4TB */
38 mm
->context
.asce_limit
= STACK_TOP_MAX
;
39 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
40 _ASCE_USER_BITS
| _ASCE_TYPE_REGION3
;
43 /* forked 4-level task, set new asce with new mm->pgd */
44 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
45 _ASCE_USER_BITS
| _ASCE_TYPE_REGION2
;
48 /* forked 2-level compat task, set new asce with new mm->pgd */
49 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
50 _ASCE_USER_BITS
| _ASCE_TYPE_SEGMENT
;
51 /* pgd_alloc() did not increase mm->nr_pmds */
54 crst_table_init((unsigned long *) mm
->pgd
, pgd_entry_type(mm
));
58 #define destroy_context(mm) do { } while (0)
60 static inline void set_user_asce(struct mm_struct
*mm
)
62 S390_lowcore
.user_asce
= mm
->context
.asce
;
63 if (current
->thread
.mm_segment
.ar4
)
64 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
65 set_cpu_flag(CIF_ASCE
);
68 static inline void clear_user_asce(void)
70 S390_lowcore
.user_asce
= S390_lowcore
.kernel_asce
;
72 __ctl_load(S390_lowcore
.user_asce
, 1, 1);
73 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
76 static inline void load_kernel_asce(void)
80 __ctl_store(asce
, 1, 1);
81 if (asce
!= S390_lowcore
.kernel_asce
)
82 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
83 set_cpu_flag(CIF_ASCE
);
86 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
,
87 struct task_struct
*tsk
)
89 int cpu
= smp_processor_id();
91 S390_lowcore
.user_asce
= next
->context
.asce
;
94 cpumask_set_cpu(cpu
, &next
->context
.cpu_attach_mask
);
95 cpumask_set_cpu(cpu
, mm_cpumask(next
));
96 /* Clear old ASCE by loading the kernel ASCE. */
97 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
98 __ctl_load(S390_lowcore
.kernel_asce
, 7, 7);
99 cpumask_clear_cpu(cpu
, &prev
->context
.cpu_attach_mask
);
102 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
103 static inline void finish_arch_post_lock_switch(void)
105 struct task_struct
*tsk
= current
;
106 struct mm_struct
*mm
= tsk
->mm
;
111 while (atomic_read(&mm
->context
.flush_count
))
114 if (mm
->context
.flush_mm
)
118 set_fs(current
->thread
.mm_segment
);
121 #define enter_lazy_tlb(mm,tsk) do { } while (0)
122 #define deactivate_mm(tsk,mm) do { } while (0)
124 static inline void activate_mm(struct mm_struct
*prev
,
125 struct mm_struct
*next
)
127 switch_mm(prev
, next
, current
);
131 static inline void arch_dup_mmap(struct mm_struct
*oldmm
,
132 struct mm_struct
*mm
)
136 static inline void arch_exit_mmap(struct mm_struct
*mm
)
140 static inline void arch_unmap(struct mm_struct
*mm
,
141 struct vm_area_struct
*vma
,
142 unsigned long start
, unsigned long end
)
146 static inline void arch_bprm_mm_init(struct mm_struct
*mm
,
147 struct vm_area_struct
*vma
)
151 static inline bool arch_vma_access_permitted(struct vm_area_struct
*vma
,
152 bool write
, bool execute
, bool foreign
)
154 /* by default, allow everything */
158 static inline bool arch_pte_access_permitted(pte_t pte
, bool write
)
160 /* by default, allow everything */
163 #endif /* __S390_MMU_CONTEXT_H */