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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
12/*
13 * get a new mmu context.. S390 don't know about contexts.
14 */
15#define init_new_context(tsk,mm) 0
16
17#define destroy_context(mm) do { } while (0)
18
19static inline void enter_lazy_tlb(struct mm_struct *mm,
20 struct task_struct *tsk)
21{
22}
23
24static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
25 struct task_struct *tsk)
26{
27 if (prev != next) {
28#ifndef __s390x__
29 S390_lowcore.user_asce = (__pa(next->pgd)&PAGE_MASK) |
30 (_SEGMENT_TABLE|USER_STD_MASK);
31 /* Load home space page table origin. */
32 asm volatile("lctl 13,13,%0"
33 : : "m" (S390_lowcore.user_asce) );
34#else /* __s390x__ */
35 S390_lowcore.user_asce = (__pa(next->pgd) & PAGE_MASK) |
36 (_REGION_TABLE|USER_STD_MASK);
37 /* Load home space page table origin. */
38 asm volatile("lctlg 13,13,%0"
39 : : "m" (S390_lowcore.user_asce) );
40#endif /* __s390x__ */
41 }
42 cpu_set(smp_processor_id(), next->cpu_vm_mask);
43}
44
45#define deactivate_mm(tsk,mm) do { } while (0)
46
47static inline void activate_mm(struct mm_struct *prev,
48 struct mm_struct *next)
49{
50 switch_mm(prev, next, current);
51 set_fs(current->thread.mm_segment);
52}
53
54#endif