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 | { | |
050eef36 MS |
18 | atomic_set(&mm->context.attach_count, 0); |
19 | mm->context.flush_mm = 0; | |
146e4b3c | 20 | mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS; |
6f457e1a | 21 | #ifdef CONFIG_64BIT |
6252d702 | 22 | mm->context.asce_bits |= _ASCE_TYPE_REGION3; |
6f457e1a | 23 | #endif |
badb8bb9 | 24 | if (current->mm && current->mm->context.alloc_pgste) { |
250cf776 CB |
25 | /* |
26 | * alloc_pgste indicates, that any NEW context will be created | |
27 | * with extended page tables. The old context is unchanged. The | |
28 | * page table allocation and the page table operations will | |
29 | * look at has_pgste to distinguish normal and extended page | |
30 | * tables. The only way to create extended page tables is to | |
31 | * set alloc_pgste and then create a new context (e.g. dup_mm). | |
32 | * The page table allocation is called after init_new_context | |
33 | * and if has_pgste is set, it will create extended page | |
34 | * tables. | |
35 | */ | |
250cf776 CB |
36 | mm->context.has_pgste = 1; |
37 | mm->context.alloc_pgste = 1; | |
402b0862 | 38 | } else { |
250cf776 CB |
39 | mm->context.has_pgste = 0; |
40 | mm->context.alloc_pgste = 0; | |
402b0862 | 41 | } |
6252d702 MS |
42 | mm->context.asce_limit = STACK_TOP_MAX; |
43 | crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); | |
6f457e1a MS |
44 | return 0; |
45 | } | |
1da177e4 LT |
46 | |
47 | #define destroy_context(mm) do { } while (0) | |
48 | ||
f4815ac6 | 49 | #ifndef CONFIG_64BIT |
c1821c2e | 50 | #define LCTL_OPCODE "lctl" |
c1821c2e GS |
51 | #else |
52 | #define LCTL_OPCODE "lctlg" | |
c1821c2e GS |
53 | #endif |
54 | ||
3610cce8 | 55 | static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk) |
1da177e4 | 56 | { |
146e4b3c MS |
57 | pgd_t *pgd = mm->pgd; |
58 | ||
59 | S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd); | |
d1b0d842 | 60 | if (s390_user_mode != HOME_SPACE_MODE) { |
3610cce8 | 61 | /* Load primary space page table origin. */ |
3610cce8 | 62 | asm volatile(LCTL_OPCODE" 1,1,%0\n" |
043d0708 | 63 | : : "m" (S390_lowcore.user_asce) ); |
3610cce8 MS |
64 | } else |
65 | /* Load home space page table origin. */ | |
66 | asm volatile(LCTL_OPCODE" 13,13,%0" | |
67 | : : "m" (S390_lowcore.user_asce) ); | |
6252d702 | 68 | set_fs(current->thread.mm_segment); |
1da177e4 LT |
69 | } |
70 | ||
71 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
c1821c2e | 72 | struct task_struct *tsk) |
1da177e4 | 73 | { |
005f8eee | 74 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); |
3610cce8 | 75 | update_mm(next, tsk); |
050eef36 MS |
76 | atomic_dec(&prev->context.attach_count); |
77 | WARN_ON(atomic_read(&prev->context.attach_count) < 0); | |
78 | atomic_inc(&next->context.attach_count); | |
79 | /* Check for TLBs not flushed yet */ | |
80 | if (next->context.flush_mm) | |
81 | __tlb_flush_mm(next); | |
1da177e4 LT |
82 | } |
83 | ||
3610cce8 | 84 | #define enter_lazy_tlb(mm,tsk) do { } while (0) |
1da177e4 LT |
85 | #define deactivate_mm(tsk,mm) do { } while (0) |
86 | ||
4448aaf0 | 87 | static inline void activate_mm(struct mm_struct *prev, |
1da177e4 LT |
88 | struct mm_struct *next) |
89 | { | |
90 | switch_mm(prev, next, current); | |
1da177e4 LT |
91 | } |
92 | ||
0f6f281b MS |
93 | static inline void arch_dup_mmap(struct mm_struct *oldmm, |
94 | struct mm_struct *mm) | |
95 | { | |
96 | #ifdef CONFIG_64BIT | |
97 | if (oldmm->context.asce_limit < mm->context.asce_limit) | |
98 | crst_table_downgrade(mm, oldmm->context.asce_limit); | |
99 | #endif | |
100 | } | |
101 | ||
102 | static inline void arch_exit_mmap(struct mm_struct *mm) | |
103 | { | |
104 | } | |
105 | ||
c1821c2e | 106 | #endif /* __S390_MMU_CONTEXT_H */ |