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Linux kernel mirror (for testing)
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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#include <asm/pgalloc.h>
13#include <asm-generic/mm_hooks.h>
14
15/*
16 * get a new mmu context.. S390 don't know about contexts.
17 */
18#define init_new_context(tsk,mm) 0
19
20#define destroy_context(mm) do { } while (0)
21
22#ifndef __s390x__
23#define LCTL_OPCODE "lctl"
24#else
25#define LCTL_OPCODE "lctlg"
26#endif
27
28static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
29{
30 pgd_t *pgd = mm->pgd;
31 unsigned long asce_bits;
32
33 /* Calculate asce bits from the first pgd table entry. */
34 asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
35#ifdef CONFIG_64BIT
36 asce_bits |= _ASCE_TYPE_REGION3;
37#endif
38 S390_lowcore.user_asce = asce_bits | __pa(pgd);
39 if (switch_amode) {
40 /* Load primary space page table origin. */
41 pgd_t *shadow_pgd = get_shadow_table(pgd) ? : pgd;
42 S390_lowcore.user_exec_asce = asce_bits | __pa(shadow_pgd);
43 asm volatile(LCTL_OPCODE" 1,1,%0\n"
44 : : "m" (S390_lowcore.user_exec_asce) );
45 } else
46 /* Load home space page table origin. */
47 asm volatile(LCTL_OPCODE" 13,13,%0"
48 : : "m" (S390_lowcore.user_asce) );
49}
50
51static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
52 struct task_struct *tsk)
53{
54 if (unlikely(prev == next))
55 return;
56 cpu_set(smp_processor_id(), next->cpu_vm_mask);
57 update_mm(next, tsk);
58}
59
60#define enter_lazy_tlb(mm,tsk) do { } while (0)
61#define deactivate_mm(tsk,mm) do { } while (0)
62
63static inline void activate_mm(struct mm_struct *prev,
64 struct mm_struct *next)
65{
66 switch_mm(prev, next, current);
67 set_fs(current->thread.mm_segment);
68}
69
70#endif /* __S390_MMU_CONTEXT_H */