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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
Christian Borntraeger250cf772008-10-28 11:10:15 +010023 if (current->mm->context.alloc_pgste) {
24 /*
25 * alloc_pgste indicates, that any NEW context will be created
26 * with extended page tables. The old context is unchanged. The
27 * page table allocation and the page table operations will
28 * look at has_pgste to distinguish normal and extended page
29 * tables. The only way to create extended page tables is to
30 * set alloc_pgste and then create a new context (e.g. dup_mm).
31 * The page table allocation is called after init_new_context
32 * and if has_pgste is set, it will create extended page
33 * tables.
34 */
Carsten Otte402b0862008-03-25 18:47:10 +010035 mm->context.noexec = 0;
Christian Borntraeger250cf772008-10-28 11:10:15 +010036 mm->context.has_pgste = 1;
37 mm->context.alloc_pgste = 1;
Carsten Otte402b0862008-03-25 18:47:10 +010038 } else {
39 mm->context.noexec = s390_noexec;
Christian Borntraeger250cf772008-10-28 11:10:15 +010040 mm->context.has_pgste = 0;
41 mm->context.alloc_pgste = 0;
Carsten Otte402b0862008-03-25 18:47:10 +010042 }
Martin Schwidefsky6252d702008-02-09 18:24:37 +010043 mm->context.asce_limit = STACK_TOP_MAX;
44 crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
Martin Schwidefsky6f457e12008-01-26 14:10:58 +010045 return 0;
46}
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#define destroy_context(mm) do { } while (0)
49
Gerald Schaeferc1821c22007-02-05 21:18:17 +010050#ifndef __s390x__
51#define LCTL_OPCODE "lctl"
Gerald Schaeferc1821c22007-02-05 21:18:17 +010052#else
53#define LCTL_OPCODE "lctlg"
Gerald Schaeferc1821c22007-02-05 21:18:17 +010054#endif
55
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020056static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
Martin Schwidefsky146e4b32008-02-09 18:24:35 +010058 pgd_t *pgd = mm->pgd;
59
60 S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020061 if (switch_amode) {
62 /* Load primary space page table origin. */
Martin Schwidefsky146e4b32008-02-09 18:24:35 +010063 pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
64 S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020065 asm volatile(LCTL_OPCODE" 1,1,%0\n"
66 : : "m" (S390_lowcore.user_exec_asce) );
67 } else
68 /* Load home space page table origin. */
69 asm volatile(LCTL_OPCODE" 13,13,%0"
70 : : "m" (S390_lowcore.user_asce) );
Martin Schwidefsky6252d702008-02-09 18:24:37 +010071 set_fs(current->thread.mm_segment);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072}
73
74static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
Gerald Schaeferc1821c22007-02-05 21:18:17 +010075 struct task_struct *tsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
Rusty Russell005f8ee2009-03-26 15:25:01 +010077 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020078 update_mm(next, tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079}
80
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020081#define enter_lazy_tlb(mm,tsk) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#define deactivate_mm(tsk,mm) do { } while (0)
83
Adrian Bunk4448aaf2005-11-08 21:34:42 -080084static inline void activate_mm(struct mm_struct *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 struct mm_struct *next)
86{
87 switch_mm(prev, next, current);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
Gerald Schaeferc1821c22007-02-05 21:18:17 +010090#endif /* __S390_MMU_CONTEXT_H */