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; |
6252d702 | 22 | mm->context.asce_bits |= _ASCE_TYPE_REGION3; |
3eabaee9 | 23 | mm->context.has_pgste = 0; |
693ffc08 | 24 | mm->context.use_skey = 0; |
6252d702 MS |
25 | mm->context.asce_limit = STACK_TOP_MAX; |
26 | crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); | |
6f457e1a MS |
27 | return 0; |
28 | } | |
1da177e4 LT |
29 | |
30 | #define destroy_context(mm) do { } while (0) | |
31 | ||
beef560b | 32 | static inline void set_user_asce(struct mm_struct *mm) |
1da177e4 | 33 | { |
f8b13505 MS |
34 | S390_lowcore.user_asce = mm->context.asce_bits | __pa(mm->pgd); |
35 | if (current->thread.mm_segment.ar4) | |
36 | __ctl_load(S390_lowcore.user_asce, 7, 7); | |
d3a73acb | 37 | set_cpu_flag(CIF_ASCE); |
1da177e4 LT |
38 | } |
39 | ||
beef560b | 40 | static inline void clear_user_asce(void) |
02a8f3ab MS |
41 | { |
42 | S390_lowcore.user_asce = S390_lowcore.kernel_asce; | |
457f2180 | 43 | |
beef560b | 44 | __ctl_load(S390_lowcore.user_asce, 1, 1); |
457f2180 HC |
45 | __ctl_load(S390_lowcore.user_asce, 7, 7); |
46 | } | |
47 | ||
beef560b | 48 | static inline void load_kernel_asce(void) |
457f2180 HC |
49 | { |
50 | unsigned long asce; | |
51 | ||
52 | __ctl_store(asce, 1, 1); | |
53 | if (asce != S390_lowcore.kernel_asce) | |
54 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); | |
d3a73acb | 55 | set_cpu_flag(CIF_ASCE); |
02a8f3ab MS |
56 | } |
57 | ||
1da177e4 | 58 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
c1821c2e | 59 | struct task_struct *tsk) |
1da177e4 | 60 | { |
53e857f3 MS |
61 | int cpu = smp_processor_id(); |
62 | ||
691d5264 | 63 | S390_lowcore.user_asce = next->context.asce_bits | __pa(next->pgd); |
53e857f3 MS |
64 | if (prev == next) |
65 | return; | |
1b948d6c MS |
66 | if (MACHINE_HAS_TLB_LC) |
67 | cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); | |
beef560b MS |
68 | /* Clear old ASCE by loading the kernel ASCE. */ |
69 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); | |
70 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
beef560b | 71 | atomic_inc(&next->context.attach_count); |
050eef36 | 72 | atomic_dec(&prev->context.attach_count); |
1b948d6c MS |
73 | if (MACHINE_HAS_TLB_LC) |
74 | cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); | |
53e857f3 MS |
75 | } |
76 | ||
77 | #define finish_arch_post_lock_switch finish_arch_post_lock_switch | |
78 | static inline void finish_arch_post_lock_switch(void) | |
79 | { | |
80 | struct task_struct *tsk = current; | |
81 | struct mm_struct *mm = tsk->mm; | |
82 | ||
f8b13505 MS |
83 | load_kernel_asce(); |
84 | if (mm) { | |
85 | preempt_disable(); | |
86 | while (atomic_read(&mm->context.attach_count) >> 16) | |
87 | cpu_relax(); | |
88 | ||
89 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); | |
90 | if (mm->context.flush_mm) | |
91 | __tlb_flush_mm(mm); | |
92 | preempt_enable(); | |
93 | } | |
94 | set_fs(current->thread.mm_segment); | |
1da177e4 LT |
95 | } |
96 | ||
3610cce8 | 97 | #define enter_lazy_tlb(mm,tsk) do { } while (0) |
1da177e4 LT |
98 | #define deactivate_mm(tsk,mm) do { } while (0) |
99 | ||
4448aaf0 | 100 | static inline void activate_mm(struct mm_struct *prev, |
1da177e4 LT |
101 | struct mm_struct *next) |
102 | { | |
beef560b MS |
103 | switch_mm(prev, next, current); |
104 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); | |
105 | set_user_asce(next); | |
1da177e4 LT |
106 | } |
107 | ||
0f6f281b MS |
108 | static inline void arch_dup_mmap(struct mm_struct *oldmm, |
109 | struct mm_struct *mm) | |
110 | { | |
0f6f281b MS |
111 | if (oldmm->context.asce_limit < mm->context.asce_limit) |
112 | crst_table_downgrade(mm, oldmm->context.asce_limit); | |
0f6f281b MS |
113 | } |
114 | ||
115 | static inline void arch_exit_mmap(struct mm_struct *mm) | |
116 | { | |
117 | } | |
118 | ||
62e88b1c DH |
119 | static inline void arch_unmap(struct mm_struct *mm, |
120 | struct vm_area_struct *vma, | |
121 | unsigned long start, unsigned long end) | |
122 | { | |
123 | } | |
124 | ||
125 | static inline void arch_bprm_mm_init(struct mm_struct *mm, | |
126 | struct vm_area_struct *vma) | |
127 | { | |
128 | } | |
129 | ||
c1821c2e | 130 | #endif /* __S390_MMU_CONTEXT_H */ |