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 | { | |
8ecb1a59 | 18 | spin_lock_init(&mm->context.pgtable_lock); |
3446c13b | 19 | INIT_LIST_HEAD(&mm->context.pgtable_list); |
8ecb1a59 | 20 | spin_lock_init(&mm->context.gmap_lock); |
3446c13b | 21 | INIT_LIST_HEAD(&mm->context.gmap_list); |
1b948d6c | 22 | cpumask_clear(&mm->context.cpu_attach_mask); |
64f31d58 | 23 | atomic_set(&mm->context.flush_count, 0); |
050eef36 | 24 | mm->context.flush_mm = 0; |
0b46e0a3 MS |
25 | #ifdef CONFIG_PGSTE |
26 | mm->context.alloc_pgste = page_table_allocate_pgste; | |
3eabaee9 | 27 | mm->context.has_pgste = 0; |
693ffc08 | 28 | mm->context.use_skey = 0; |
0b46e0a3 | 29 | #endif |
723cacbd GS |
30 | switch (mm->context.asce_limit) { |
31 | case 1UL << 42: | |
32 | /* | |
33 | * forked 3-level task, fall through to set new asce with new | |
34 | * mm->pgd | |
35 | */ | |
36 | case 0: | |
3446c13b | 37 | /* context created by exec, set asce limit to 4TB */ |
3446c13b | 38 | mm->context.asce_limit = STACK_TOP_MAX; |
723cacbd GS |
39 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | |
40 | _ASCE_USER_BITS | _ASCE_TYPE_REGION3; | |
41 | break; | |
42 | case 1UL << 53: | |
43 | /* forked 4-level task, set new asce with new mm->pgd */ | |
44 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | | |
45 | _ASCE_USER_BITS | _ASCE_TYPE_REGION2; | |
46 | break; | |
47 | case 1UL << 31: | |
48 | /* forked 2-level compat task, set new asce with new mm->pgd */ | |
49 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | | |
50 | _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT; | |
51 | /* pgd_alloc() did not increase mm->nr_pmds */ | |
3446c13b MS |
52 | mm_inc_nr_pmds(mm); |
53 | } | |
6252d702 | 54 | crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); |
6f457e1a MS |
55 | return 0; |
56 | } | |
1da177e4 LT |
57 | |
58 | #define destroy_context(mm) do { } while (0) | |
59 | ||
beef560b | 60 | static inline void set_user_asce(struct mm_struct *mm) |
1da177e4 | 61 | { |
723cacbd | 62 | S390_lowcore.user_asce = mm->context.asce; |
f8b13505 MS |
63 | if (current->thread.mm_segment.ar4) |
64 | __ctl_load(S390_lowcore.user_asce, 7, 7); | |
d3a73acb | 65 | set_cpu_flag(CIF_ASCE); |
1da177e4 LT |
66 | } |
67 | ||
beef560b | 68 | static inline void clear_user_asce(void) |
02a8f3ab MS |
69 | { |
70 | S390_lowcore.user_asce = S390_lowcore.kernel_asce; | |
457f2180 | 71 | |
beef560b | 72 | __ctl_load(S390_lowcore.user_asce, 1, 1); |
457f2180 HC |
73 | __ctl_load(S390_lowcore.user_asce, 7, 7); |
74 | } | |
75 | ||
beef560b | 76 | static inline void load_kernel_asce(void) |
457f2180 HC |
77 | { |
78 | unsigned long asce; | |
79 | ||
80 | __ctl_store(asce, 1, 1); | |
81 | if (asce != S390_lowcore.kernel_asce) | |
82 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); | |
d3a73acb | 83 | set_cpu_flag(CIF_ASCE); |
02a8f3ab MS |
84 | } |
85 | ||
1da177e4 | 86 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
c1821c2e | 87 | struct task_struct *tsk) |
1da177e4 | 88 | { |
53e857f3 MS |
89 | int cpu = smp_processor_id(); |
90 | ||
723cacbd | 91 | S390_lowcore.user_asce = next->context.asce; |
53e857f3 MS |
92 | if (prev == next) |
93 | return; | |
64f31d58 MS |
94 | cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); |
95 | cpumask_set_cpu(cpu, mm_cpumask(next)); | |
beef560b MS |
96 | /* Clear old ASCE by loading the kernel ASCE. */ |
97 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); | |
98 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
64f31d58 | 99 | cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); |
53e857f3 MS |
100 | } |
101 | ||
102 | #define finish_arch_post_lock_switch finish_arch_post_lock_switch | |
103 | static inline void finish_arch_post_lock_switch(void) | |
104 | { | |
105 | struct task_struct *tsk = current; | |
106 | struct mm_struct *mm = tsk->mm; | |
107 | ||
f8b13505 MS |
108 | load_kernel_asce(); |
109 | if (mm) { | |
110 | preempt_disable(); | |
64f31d58 | 111 | while (atomic_read(&mm->context.flush_count)) |
f8b13505 MS |
112 | cpu_relax(); |
113 | ||
f8b13505 MS |
114 | if (mm->context.flush_mm) |
115 | __tlb_flush_mm(mm); | |
116 | preempt_enable(); | |
117 | } | |
118 | set_fs(current->thread.mm_segment); | |
1da177e4 LT |
119 | } |
120 | ||
3610cce8 | 121 | #define enter_lazy_tlb(mm,tsk) do { } while (0) |
1da177e4 LT |
122 | #define deactivate_mm(tsk,mm) do { } while (0) |
123 | ||
4448aaf0 | 124 | static inline void activate_mm(struct mm_struct *prev, |
1da177e4 LT |
125 | struct mm_struct *next) |
126 | { | |
beef560b | 127 | switch_mm(prev, next, current); |
beef560b | 128 | set_user_asce(next); |
1da177e4 LT |
129 | } |
130 | ||
0f6f281b MS |
131 | static inline void arch_dup_mmap(struct mm_struct *oldmm, |
132 | struct mm_struct *mm) | |
133 | { | |
0f6f281b MS |
134 | } |
135 | ||
136 | static inline void arch_exit_mmap(struct mm_struct *mm) | |
137 | { | |
138 | } | |
139 | ||
62e88b1c DH |
140 | static inline void arch_unmap(struct mm_struct *mm, |
141 | struct vm_area_struct *vma, | |
142 | unsigned long start, unsigned long end) | |
143 | { | |
144 | } | |
145 | ||
146 | static inline void arch_bprm_mm_init(struct mm_struct *mm, | |
147 | struct vm_area_struct *vma) | |
148 | { | |
149 | } | |
150 | ||
1b2ee126 | 151 | static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, |
d61172b4 | 152 | bool write, bool execute, bool foreign) |
33a709b2 DH |
153 | { |
154 | /* by default, allow everything */ | |
155 | return true; | |
156 | } | |
157 | ||
158 | static inline bool arch_pte_access_permitted(pte_t pte, bool write) | |
159 | { | |
160 | /* by default, allow everything */ | |
161 | return true; | |
162 | } | |
c1821c2e | 163 | #endif /* __S390_MMU_CONTEXT_H */ |