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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Gerald Schaeferc1821c22007-02-05 21:18:17 +010012#include <asm/pgalloc.h>
Jeremy Fitzhardinged6dd61c2007-05-02 19:27:14 +020013#include <asm-generic/mm_hooks.h>
14
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010015static inline int init_new_context(struct task_struct *tsk,
16 struct mm_struct *mm)
17{
18 mm->context = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
19#ifdef CONFIG_64BIT
20 mm->context |= _ASCE_TYPE_REGION3;
21#endif
22 return 0;
23}
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#define destroy_context(mm) do { } while (0)
26
Gerald Schaeferc1821c22007-02-05 21:18:17 +010027#ifndef __s390x__
28#define LCTL_OPCODE "lctl"
Gerald Schaeferc1821c22007-02-05 21:18:17 +010029#else
30#define LCTL_OPCODE "lctlg"
Gerald Schaeferc1821c22007-02-05 21:18:17 +010031#endif
32
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020033static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034{
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010035 S390_lowcore.user_asce = mm->context | __pa(mm->pgd);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020036 if (switch_amode) {
37 /* Load primary space page table origin. */
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010038 pgd_t *shadow_pgd = get_shadow_table(mm->pgd) ? : mm->pgd;
39 S390_lowcore.user_exec_asce = mm->context | __pa(shadow_pgd);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020040 asm volatile(LCTL_OPCODE" 1,1,%0\n"
41 : : "m" (S390_lowcore.user_exec_asce) );
42 } else
43 /* Load home space page table origin. */
44 asm volatile(LCTL_OPCODE" 13,13,%0"
45 : : "m" (S390_lowcore.user_asce) );
Linus Torvalds1da177e2005-04-16 15:20:36 -070046}
47
48static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
Gerald Schaeferc1821c22007-02-05 21:18:17 +010049 struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020051 if (unlikely(prev == next))
52 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 cpu_set(smp_processor_id(), next->cpu_vm_mask);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020054 update_mm(next, tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020057#define enter_lazy_tlb(mm,tsk) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#define deactivate_mm(tsk,mm) do { } while (0)
59
Adrian Bunk4448aaf2005-11-08 21:34:42 -080060static inline void activate_mm(struct mm_struct *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 struct mm_struct *next)
62{
63 switch_mm(prev, next, current);
64 set_fs(current->thread.mm_segment);
65}
66
Gerald Schaeferc1821c22007-02-05 21:18:17 +010067#endif /* __S390_MMU_CONTEXT_H */