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 <linux/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
.lock
);
19 spin_lock_init(&mm
->context
.pgtable_lock
);
20 INIT_LIST_HEAD(&mm
->context
.pgtable_list
);
21 spin_lock_init(&mm
->context
.gmap_lock
);
22 INIT_LIST_HEAD(&mm
->context
.gmap_list
);
23 cpumask_clear(&mm
->context
.cpu_attach_mask
);
24 atomic_set(&mm
->context
.flush_count
, 0);
25 mm
->context
.gmap_asce
= 0;
26 mm
->context
.flush_mm
= 0;
28 mm
->context
.alloc_pgste
= page_table_allocate_pgste
;
29 mm
->context
.has_pgste
= 0;
30 mm
->context
.use_skey
= 0;
32 switch (mm
->context
.asce_limit
) {
35 * forked 3-level task, fall through to set new asce with new
39 /* context created by exec, set asce limit to 4TB */
40 mm
->context
.asce_limit
= STACK_TOP_MAX
;
41 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
42 _ASCE_USER_BITS
| _ASCE_TYPE_REGION3
;
45 /* forked 4-level task, set new asce with new mm->pgd */
46 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
47 _ASCE_USER_BITS
| _ASCE_TYPE_REGION2
;
50 /* forked 2-level compat task, set new asce with new mm->pgd */
51 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
52 _ASCE_USER_BITS
| _ASCE_TYPE_SEGMENT
;
53 /* pgd_alloc() did not increase mm->nr_pmds */
56 crst_table_init((unsigned long *) mm
->pgd
, pgd_entry_type(mm
));
60 #define destroy_context(mm) do { } while (0)
62 static inline void set_user_asce(struct mm_struct
*mm
)
64 S390_lowcore
.user_asce
= mm
->context
.asce
;
65 if (current
->thread
.mm_segment
.ar4
)
66 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
67 set_cpu_flag(CIF_ASCE
);
70 static inline void clear_user_asce(void)
72 S390_lowcore
.user_asce
= S390_lowcore
.kernel_asce
;
74 __ctl_load(S390_lowcore
.user_asce
, 1, 1);
75 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
78 static inline void load_kernel_asce(void)
82 __ctl_store(asce
, 1, 1);
83 if (asce
!= S390_lowcore
.kernel_asce
)
84 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
85 set_cpu_flag(CIF_ASCE
);
88 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
,
89 struct task_struct
*tsk
)
91 int cpu
= smp_processor_id();
93 S390_lowcore
.user_asce
= next
->context
.asce
;
96 cpumask_set_cpu(cpu
, &next
->context
.cpu_attach_mask
);
97 /* Clear old ASCE by loading the kernel ASCE. */
98 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
99 __ctl_load(S390_lowcore
.kernel_asce
, 7, 7);
100 cpumask_clear_cpu(cpu
, &prev
->context
.cpu_attach_mask
);
103 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
104 static inline void finish_arch_post_lock_switch(void)
106 struct task_struct
*tsk
= current
;
107 struct mm_struct
*mm
= tsk
->mm
;
112 while (atomic_read(&mm
->context
.flush_count
))
114 cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm
));
115 __tlb_flush_mm_lazy(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
);
128 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next
));
132 static inline void arch_dup_mmap(struct mm_struct
*oldmm
,
133 struct mm_struct
*mm
)
137 static inline void arch_exit_mmap(struct mm_struct
*mm
)
141 static inline void arch_unmap(struct mm_struct
*mm
,
142 struct vm_area_struct
*vma
,
143 unsigned long start
, unsigned long end
)
147 static inline void arch_bprm_mm_init(struct mm_struct
*mm
,
148 struct vm_area_struct
*vma
)
152 static inline bool arch_vma_access_permitted(struct vm_area_struct
*vma
,
153 bool write
, bool execute
, bool foreign
)
155 /* by default, allow everything */
159 static inline bool arch_pte_access_permitted(pte_t pte
, bool write
)
161 /* by default, allow everything */
164 #endif /* __S390_MMU_CONTEXT_H */