Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * S390 version |
3 | * | |
4 | * Derived from "include/asm-i386/mmu_context.h" | |
5 | */ | |
6 | ||
7 | #ifndef __S390_MMU_CONTEXT_H | |
8 | #define __S390_MMU_CONTEXT_H | |
9 | ||
c1821c2e | 10 | #include <asm/pgalloc.h> |
146e4b3c | 11 | #include <asm/uaccess.h> |
050eef36 | 12 | #include <asm/tlbflush.h> |
a0616cde | 13 | #include <asm/ctl_reg.h> |
d6dd61c8 | 14 | |
6f457e1a MS |
15 | static inline int init_new_context(struct task_struct *tsk, |
16 | struct mm_struct *mm) | |
17 | { | |
1b948d6c | 18 | cpumask_clear(&mm->context.cpu_attach_mask); |
050eef36 MS |
19 | atomic_set(&mm->context.attach_count, 0); |
20 | mm->context.flush_mm = 0; | |
146e4b3c | 21 | mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS; |
6f457e1a | 22 | #ifdef CONFIG_64BIT |
6252d702 | 23 | mm->context.asce_bits |= _ASCE_TYPE_REGION3; |
6f457e1a | 24 | #endif |
3eabaee9 | 25 | mm->context.has_pgste = 0; |
693ffc08 | 26 | mm->context.use_skey = 0; |
6252d702 MS |
27 | mm->context.asce_limit = STACK_TOP_MAX; |
28 | crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); | |
6f457e1a MS |
29 | return 0; |
30 | } | |
1da177e4 LT |
31 | |
32 | #define destroy_context(mm) do { } while (0) | |
33 | ||
beef560b | 34 | static inline void set_user_asce(struct mm_struct *mm) |
1da177e4 | 35 | { |
f8b13505 MS |
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); | |
d3a73acb | 39 | set_cpu_flag(CIF_ASCE); |
1da177e4 LT |
40 | } |
41 | ||
beef560b | 42 | static inline void clear_user_asce(void) |
02a8f3ab MS |
43 | { |
44 | S390_lowcore.user_asce = S390_lowcore.kernel_asce; | |
457f2180 | 45 | |
beef560b | 46 | __ctl_load(S390_lowcore.user_asce, 1, 1); |
457f2180 HC |
47 | __ctl_load(S390_lowcore.user_asce, 7, 7); |
48 | } | |
49 | ||
beef560b | 50 | static inline void load_kernel_asce(void) |
457f2180 HC |
51 | { |
52 | unsigned long asce; | |
53 | ||
54 | __ctl_store(asce, 1, 1); | |
55 | if (asce != S390_lowcore.kernel_asce) | |
56 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); | |
d3a73acb | 57 | set_cpu_flag(CIF_ASCE); |
02a8f3ab MS |
58 | } |
59 | ||
1da177e4 | 60 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
c1821c2e | 61 | struct task_struct *tsk) |
1da177e4 | 62 | { |
53e857f3 MS |
63 | int cpu = smp_processor_id(); |
64 | ||
65 | if (prev == next) | |
66 | return; | |
1b948d6c MS |
67 | if (MACHINE_HAS_TLB_LC) |
68 | cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); | |
beef560b MS |
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); | |
beef560b | 72 | atomic_inc(&next->context.attach_count); |
050eef36 | 73 | atomic_dec(&prev->context.attach_count); |
1b948d6c MS |
74 | if (MACHINE_HAS_TLB_LC) |
75 | cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); | |
f8b13505 | 76 | S390_lowcore.user_asce = next->context.asce_bits | __pa(next->pgd); |
53e857f3 MS |
77 | } |
78 | ||
79 | #define finish_arch_post_lock_switch finish_arch_post_lock_switch | |
80 | static inline void finish_arch_post_lock_switch(void) | |
81 | { | |
82 | struct task_struct *tsk = current; | |
83 | struct mm_struct *mm = tsk->mm; | |
84 | ||
f8b13505 MS |
85 | load_kernel_asce(); |
86 | if (mm) { | |
87 | preempt_disable(); | |
88 | while (atomic_read(&mm->context.attach_count) >> 16) | |
89 | cpu_relax(); | |
90 | ||
91 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); | |
92 | if (mm->context.flush_mm) | |
93 | __tlb_flush_mm(mm); | |
94 | preempt_enable(); | |
95 | } | |
96 | set_fs(current->thread.mm_segment); | |
1da177e4 LT |
97 | } |
98 | ||
3610cce8 | 99 | #define enter_lazy_tlb(mm,tsk) do { } while (0) |
1da177e4 LT |
100 | #define deactivate_mm(tsk,mm) do { } while (0) |
101 | ||
4448aaf0 | 102 | static inline void activate_mm(struct mm_struct *prev, |
1da177e4 LT |
103 | struct mm_struct *next) |
104 | { | |
beef560b MS |
105 | switch_mm(prev, next, current); |
106 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); | |
107 | set_user_asce(next); | |
1da177e4 LT |
108 | } |
109 | ||
0f6f281b MS |
110 | static inline void arch_dup_mmap(struct mm_struct *oldmm, |
111 | struct mm_struct *mm) | |
112 | { | |
113 | #ifdef CONFIG_64BIT | |
114 | if (oldmm->context.asce_limit < mm->context.asce_limit) | |
115 | crst_table_downgrade(mm, oldmm->context.asce_limit); | |
116 | #endif | |
117 | } | |
118 | ||
119 | static inline void arch_exit_mmap(struct mm_struct *mm) | |
120 | { | |
121 | } | |
122 | ||
c1821c2e | 123 | #endif /* __S390_MMU_CONTEXT_H */ |