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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/s390/include/asm/mmu_context.h
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 cpumask_clear(&mm
->context
.cpu_attach_mask
);
19 atomic_set(&mm
->context
.attach_count
, 0);
20 mm
->context
.flush_mm
= 0;
21 mm
->context
.asce_bits
= _ASCE_TABLE_LENGTH
| _ASCE_USER_BITS
;
23 mm
->context
.asce_bits
|= _ASCE_TYPE_REGION3
;
25 mm
->context
.has_pgste
= 0;
26 mm
->context
.use_skey
= 0;
27 mm
->context
.asce_limit
= STACK_TOP_MAX
;
28 crst_table_init((unsigned long *) mm
->pgd
, pgd_entry_type(mm
));
32 #define destroy_context(mm) do { } while (0)
34 static inline void set_user_asce(struct mm_struct
*mm
)
36 S390_lowcore
.user_asce
= mm
->context
.asce_bits
| __pa(mm
->pgd
);
37 if (current
->thread
.mm_segment
.ar4
)
38 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
39 set_cpu_flag(CIF_ASCE
);
42 static inline void clear_user_asce(void)
44 S390_lowcore
.user_asce
= S390_lowcore
.kernel_asce
;
46 __ctl_load(S390_lowcore
.user_asce
, 1, 1);
47 __ctl_load(S390_lowcore
.user_asce
, 7, 7);
50 static inline void load_kernel_asce(void)
54 __ctl_store(asce
, 1, 1);
55 if (asce
!= S390_lowcore
.kernel_asce
)
56 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
57 set_cpu_flag(CIF_ASCE
);
60 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
,
61 struct task_struct
*tsk
)
63 int cpu
= smp_processor_id();
67 if (MACHINE_HAS_TLB_LC
)
68 cpumask_set_cpu(cpu
, &next
->context
.cpu_attach_mask
);
69 /* Clear old ASCE by loading the kernel ASCE. */
70 __ctl_load(S390_lowcore
.kernel_asce
, 1, 1);
71 __ctl_load(S390_lowcore
.kernel_asce
, 7, 7);
72 atomic_inc(&next
->context
.attach_count
);
73 atomic_dec(&prev
->context
.attach_count
);
74 if (MACHINE_HAS_TLB_LC
)
75 cpumask_clear_cpu(cpu
, &prev
->context
.cpu_attach_mask
);
76 S390_lowcore
.user_asce
= next
->context
.asce_bits
| __pa(next
->pgd
);
79 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
80 static inline void finish_arch_post_lock_switch(void)
82 struct task_struct
*tsk
= current
;
83 struct mm_struct
*mm
= tsk
->mm
;
88 while (atomic_read(&mm
->context
.attach_count
) >> 16)
91 cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm
));
92 if (mm
->context
.flush_mm
)
96 set_fs(current
->thread
.mm_segment
);
99 #define enter_lazy_tlb(mm,tsk) do { } while (0)
100 #define deactivate_mm(tsk,mm) do { } while (0)
102 static inline void activate_mm(struct mm_struct
*prev
,
103 struct mm_struct
*next
)
105 switch_mm(prev
, next
, current
);
106 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next
));
110 static inline void arch_dup_mmap(struct mm_struct
*oldmm
,
111 struct mm_struct
*mm
)
114 if (oldmm
->context
.asce_limit
< mm
->context
.asce_limit
)
115 crst_table_downgrade(mm
, oldmm
->context
.asce_limit
);
119 static inline void arch_exit_mmap(struct mm_struct
*mm
)
123 static inline void arch_unmap(struct mm_struct
*mm
,
124 struct vm_area_struct
*vma
,
125 unsigned long start
, unsigned long end
)
129 static inline void arch_bprm_mm_init(struct mm_struct
*mm
,
130 struct vm_area_struct
*vma
)
134 #endif /* __S390_MMU_CONTEXT_H */