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 <linux/mm_types.h>
13 #include <asm/tlbflush.h>
14 #include <asm/ctl_reg.h>
16 static inline int init_new_context(struct task_struct
*tsk
,
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 test_thread_flag(TIF_PGSTE
) ||
30 current
->mm
->context
.alloc_pgste
;
31 mm
->context
.has_pgste
= 0;
32 mm
->context
.use_skey
= 0;
33 mm
->context
.use_cmma
= 0;
35 switch (mm
->context
.asce_limit
) {
38 * forked 3-level task, fall through to set new asce with new
42 /* context created by exec, set asce limit to 4TB */
43 mm
->context
.asce_limit
= STACK_TOP_MAX
;
44 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
45 _ASCE_USER_BITS
| _ASCE_TYPE_REGION3
;
48 /* forked 5-level task, set new asce with new_mm->pgd */
49 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
50 _ASCE_USER_BITS
| _ASCE_TYPE_REGION1
;
53 /* forked 4-level task, set new asce with new mm->pgd */
54 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
55 _ASCE_USER_BITS
| _ASCE_TYPE_REGION2
;
58 /* forked 2-level compat task, set new asce with new mm->pgd */
59 mm
->context
.asce
= __pa(mm
->pgd
) | _ASCE_TABLE_LENGTH
|
60 _ASCE_USER_BITS
| _ASCE_TYPE_SEGMENT
;
61 /* pgd_alloc() did not increase mm->nr_pmds */
64 crst_table_init((unsigned long *) mm
->pgd
, pgd_entry_type(mm
));
68 #define destroy_context(mm) do { } while (0)
70 static inline void set_user_asce(struct mm_struct
*mm
)
72 S390_lowcore
.user_asce
= mm
->context
.asce
;
73 if (current
->thread
.mm_segment
.ar4
)
74 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
75 set_cpu_flag(CIF_ASCE_PRIMARY
);
78 static inline void clear_user_asce(void)
80 S390_lowcore
.user_asce
= S390_lowcore
.kernel_asce
;
82 __ctl_load(S390_lowcore
.user_asce
, 1, 1);
83 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
86 static inline void load_kernel_asce(void)
90 __ctl_store(asce
, 1, 1);
91 if (asce
!= S390_lowcore
.kernel_asce
)
92 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
93 set_cpu_flag(CIF_ASCE_PRIMARY
);
96 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
,
97 struct task_struct
*tsk
)
99 int cpu
= smp_processor_id();
101 S390_lowcore
.user_asce
= next
->context
.asce
;
104 cpumask_set_cpu(cpu
, &next
->context
.cpu_attach_mask
);
105 cpumask_set_cpu(cpu
, mm_cpumask(next
));
106 /* Clear old ASCE by loading the kernel ASCE. */
107 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
108 __ctl_load(S390_lowcore
.kernel_asce
, 7, 7);
109 cpumask_clear_cpu(cpu
, &prev
->context
.cpu_attach_mask
);
112 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
113 static inline void finish_arch_post_lock_switch(void)
115 struct task_struct
*tsk
= current
;
116 struct mm_struct
*mm
= tsk
->mm
;
121 while (atomic_read(&mm
->context
.flush_count
))
124 if (mm
->context
.flush_mm
)
128 set_fs(current
->thread
.mm_segment
);
131 #define enter_lazy_tlb(mm,tsk) do { } while (0)
132 #define deactivate_mm(tsk,mm) do { } while (0)
134 static inline void activate_mm(struct mm_struct
*prev
,
135 struct mm_struct
*next
)
137 switch_mm(prev
, next
, current
);
141 static inline void arch_dup_mmap(struct mm_struct
*oldmm
,
142 struct mm_struct
*mm
)
146 static inline void arch_exit_mmap(struct mm_struct
*mm
)
150 static inline void arch_unmap(struct mm_struct
*mm
,
151 struct vm_area_struct
*vma
,
152 unsigned long start
, unsigned long end
)
156 static inline void arch_bprm_mm_init(struct mm_struct
*mm
,
157 struct vm_area_struct
*vma
)
161 static inline bool arch_vma_access_permitted(struct vm_area_struct
*vma
,
162 bool write
, bool execute
, bool foreign
)
164 /* by default, allow everything */
167 #endif /* __S390_MMU_CONTEXT_H */