Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * include/asm-s390/mmu_context.h | |
3 | * | |
4 | * S390 version | |
5 | * | |
6 | * Derived from "include/asm-i386/mmu_context.h" | |
7 | */ | |
8 | ||
9 | #ifndef __S390_MMU_CONTEXT_H | |
10 | #define __S390_MMU_CONTEXT_H | |
11 | ||
c1821c2e | 12 | #include <asm/pgalloc.h> |
146e4b3c | 13 | #include <asm/uaccess.h> |
050eef36 | 14 | #include <asm/tlbflush.h> |
d6dd61c8 JF |
15 | #include <asm-generic/mm_hooks.h> |
16 | ||
6f457e1a MS |
17 | static inline int init_new_context(struct task_struct *tsk, |
18 | struct mm_struct *mm) | |
19 | { | |
050eef36 MS |
20 | atomic_set(&mm->context.attach_count, 0); |
21 | mm->context.flush_mm = 0; | |
146e4b3c | 22 | mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS; |
6f457e1a | 23 | #ifdef CONFIG_64BIT |
6252d702 | 24 | mm->context.asce_bits |= _ASCE_TYPE_REGION3; |
6f457e1a | 25 | #endif |
badb8bb9 | 26 | if (current->mm && current->mm->context.alloc_pgste) { |
250cf776 CB |
27 | /* |
28 | * alloc_pgste indicates, that any NEW context will be created | |
29 | * with extended page tables. The old context is unchanged. The | |
30 | * page table allocation and the page table operations will | |
31 | * look at has_pgste to distinguish normal and extended page | |
32 | * tables. The only way to create extended page tables is to | |
33 | * set alloc_pgste and then create a new context (e.g. dup_mm). | |
34 | * The page table allocation is called after init_new_context | |
35 | * and if has_pgste is set, it will create extended page | |
36 | * tables. | |
37 | */ | |
250cf776 CB |
38 | mm->context.has_pgste = 1; |
39 | mm->context.alloc_pgste = 1; | |
402b0862 | 40 | } else { |
250cf776 CB |
41 | mm->context.has_pgste = 0; |
42 | mm->context.alloc_pgste = 0; | |
402b0862 | 43 | } |
6252d702 MS |
44 | mm->context.asce_limit = STACK_TOP_MAX; |
45 | crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); | |
6f457e1a MS |
46 | return 0; |
47 | } | |
1da177e4 LT |
48 | |
49 | #define destroy_context(mm) do { } while (0) | |
50 | ||
c1821c2e GS |
51 | #ifndef __s390x__ |
52 | #define LCTL_OPCODE "lctl" | |
c1821c2e GS |
53 | #else |
54 | #define LCTL_OPCODE "lctlg" | |
c1821c2e GS |
55 | #endif |
56 | ||
3610cce8 | 57 | static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk) |
1da177e4 | 58 | { |
146e4b3c MS |
59 | pgd_t *pgd = mm->pgd; |
60 | ||
61 | S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd); | |
b11b5334 | 62 | if (user_mode != HOME_SPACE_MODE) { |
3610cce8 | 63 | /* Load primary space page table origin. */ |
3610cce8 | 64 | asm volatile(LCTL_OPCODE" 1,1,%0\n" |
043d0708 | 65 | : : "m" (S390_lowcore.user_asce) ); |
3610cce8 MS |
66 | } else |
67 | /* Load home space page table origin. */ | |
68 | asm volatile(LCTL_OPCODE" 13,13,%0" | |
69 | : : "m" (S390_lowcore.user_asce) ); | |
6252d702 | 70 | set_fs(current->thread.mm_segment); |
1da177e4 LT |
71 | } |
72 | ||
73 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
c1821c2e | 74 | struct task_struct *tsk) |
1da177e4 | 75 | { |
005f8eee | 76 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); |
3610cce8 | 77 | update_mm(next, tsk); |
050eef36 MS |
78 | atomic_dec(&prev->context.attach_count); |
79 | WARN_ON(atomic_read(&prev->context.attach_count) < 0); | |
80 | atomic_inc(&next->context.attach_count); | |
81 | /* Check for TLBs not flushed yet */ | |
82 | if (next->context.flush_mm) | |
83 | __tlb_flush_mm(next); | |
1da177e4 LT |
84 | } |
85 | ||
3610cce8 | 86 | #define enter_lazy_tlb(mm,tsk) do { } while (0) |
1da177e4 LT |
87 | #define deactivate_mm(tsk,mm) do { } while (0) |
88 | ||
4448aaf0 | 89 | static inline void activate_mm(struct mm_struct *prev, |
1da177e4 LT |
90 | struct mm_struct *next) |
91 | { | |
92 | switch_mm(prev, next, current); | |
1da177e4 LT |
93 | } |
94 | ||
c1821c2e | 95 | #endif /* __S390_MMU_CONTEXT_H */ |