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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>
Martin Schwidefsky146e4b32008-02-09 18:24:35 +010013#include <asm/uaccess.h>
Jeremy Fitzhardinged6dd61c2007-05-02 19:27:14 +020014#include <asm-generic/mm_hooks.h>
15
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010016static inline int init_new_context(struct task_struct *tsk,
17 struct mm_struct *mm)
18{
Martin Schwidefsky146e4b32008-02-09 18:24:35 +010019 mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010020#ifdef CONFIG_64BIT
Martin Schwidefsky6252d702008-02-09 18:24:37 +010021 mm->context.asce_bits |= _ASCE_TYPE_REGION3;
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010022#endif
Martin Schwidefsky146e4b32008-02-09 18:24:35 +010023 mm->context.noexec = s390_noexec;
Martin Schwidefsky6252d702008-02-09 18:24:37 +010024 mm->context.asce_limit = STACK_TOP_MAX;
25 crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010026 return 0;
27}
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#define destroy_context(mm) do { } while (0)
30
Gerald Schaeferc1821c22007-02-05 21:18:17 +010031#ifndef __s390x__
32#define LCTL_OPCODE "lctl"
Gerald Schaeferc1821c22007-02-05 21:18:17 +010033#else
34#define LCTL_OPCODE "lctlg"
Gerald Schaeferc1821c22007-02-05 21:18:17 +010035#endif
36
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020037static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
Martin Schwidefsky146e4b32008-02-09 18:24:35 +010039 pgd_t *pgd = mm->pgd;
40
41 S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020042 if (switch_amode) {
43 /* Load primary space page table origin. */
Martin Schwidefsky146e4b32008-02-09 18:24:35 +010044 pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
45 S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020046 asm volatile(LCTL_OPCODE" 1,1,%0\n"
47 : : "m" (S390_lowcore.user_exec_asce) );
48 } else
49 /* Load home space page table origin. */
50 asm volatile(LCTL_OPCODE" 13,13,%0"
51 : : "m" (S390_lowcore.user_asce) );
Martin Schwidefsky6252d702008-02-09 18:24:37 +010052 set_fs(current->thread.mm_segment);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053}
54
55static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
Gerald Schaeferc1821c22007-02-05 21:18:17 +010056 struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 cpu_set(smp_processor_id(), next->cpu_vm_mask);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020059 update_mm(next, tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060}
61
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020062#define enter_lazy_tlb(mm,tsk) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#define deactivate_mm(tsk,mm) do { } while (0)
64
Adrian Bunk4448aaf2005-11-08 21:34:42 -080065static inline void activate_mm(struct mm_struct *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 struct mm_struct *next)
67{
68 switch_mm(prev, next, current);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069}
70
Gerald Schaeferc1821c22007-02-05 21:18:17 +010071#endif /* __S390_MMU_CONTEXT_H */