1
2
3
4
5
6
7
8
9#ifndef __S390_MMU_CONTEXT_H
10#define __S390_MMU_CONTEXT_H
11
12#include <asm/pgalloc.h>
13#include <asm/uaccess.h>
14#include <asm-generic/mm_hooks.h>
15
16static inline int init_new_context(struct task_struct *tsk,
17 struct mm_struct *mm)
18{
19 mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
20#ifdef CONFIG_64BIT
21 mm->context.asce_bits |= _ASCE_TYPE_REGION3;
22#endif
23 if (current->mm->context.alloc_pgste) {
24
25
26
27
28
29
30
31
32
33
34
35 mm->context.noexec = 0;
36 mm->context.has_pgste = 1;
37 mm->context.alloc_pgste = 1;
38 } else {
39 mm->context.noexec = s390_noexec;
40 mm->context.has_pgste = 0;
41 mm->context.alloc_pgste = 0;
42 }
43 mm->context.asce_limit = STACK_TOP_MAX;
44 crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
45 return 0;
46}
47
48#define destroy_context(mm) do { } while (0)
49
50#ifndef __s390x__
51#define LCTL_OPCODE "lctl"
52#else
53#define LCTL_OPCODE "lctlg"
54#endif
55
56static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
57{
58 pgd_t *pgd = mm->pgd;
59
60 S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
61 if (switch_amode) {
62
63 pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
64 S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
65 asm volatile(LCTL_OPCODE" 1,1,%0\n"
66 : : "m" (S390_lowcore.user_exec_asce) );
67 } else
68
69 asm volatile(LCTL_OPCODE" 13,13,%0"
70 : : "m" (S390_lowcore.user_asce) );
71 set_fs(current->thread.mm_segment);
72}
73
74static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
75 struct task_struct *tsk)
76{
77 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
78 update_mm(next, tsk);
79}
80
81#define enter_lazy_tlb(mm,tsk) do { } while (0)
82#define deactivate_mm(tsk,mm) do { } while (0)
83
84static inline void activate_mm(struct mm_struct *prev,
85 struct mm_struct *next)
86{
87 switch_mm(prev, next, current);
88}
89
90#endif
91