2 * include/asm-s390/mmu_context.h
6 * Derived from "include/asm-i386/mmu_context.h"
9 #ifndef __S390_MMU_CONTEXT_H
10 #define __S390_MMU_CONTEXT_H
12 #include <asm/pgalloc.h>
14 * get a new mmu context.. S390 don't know about contexts.
16 #define init_new_context(tsk,mm) 0
18 #define destroy_context(mm) do { } while (0)
21 #define LCTL_OPCODE "lctl"
22 #define PGTABLE_BITS (_SEGMENT_TABLE|USER_STD_MASK)
24 #define LCTL_OPCODE "lctlg"
25 #define PGTABLE_BITS (_REGION_TABLE|USER_STD_MASK)
28 static inline void enter_lazy_tlb(struct mm_struct
*mm
,
29 struct task_struct
*tsk
)
33 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
,
34 struct task_struct
*tsk
)
36 pgd_t
*shadow_pgd
= get_shadow_pgd(next
->pgd
);
39 S390_lowcore
.user_asce
= (__pa(next
->pgd
) & PAGE_MASK
) |
42 /* Load primary/secondary space page table origin. */
43 S390_lowcore
.user_exec_asce
=
44 (__pa(shadow_pgd
) & PAGE_MASK
) | PGTABLE_BITS
;
45 asm volatile(LCTL_OPCODE
" 1,1,%0\n"
47 : : "m" (S390_lowcore
.user_exec_asce
),
48 "m" (S390_lowcore
.user_asce
) );
49 } else if (switch_amode
) {
50 /* Load primary space page table origin. */
51 asm volatile(LCTL_OPCODE
" 1,1,%0"
52 : : "m" (S390_lowcore
.user_asce
) );
54 /* Load home space page table origin. */
55 asm volatile(LCTL_OPCODE
" 13,13,%0"
56 : : "m" (S390_lowcore
.user_asce
) );
58 cpu_set(smp_processor_id(), next
->cpu_vm_mask
);
61 #define deactivate_mm(tsk,mm) do { } while (0)
63 static inline void activate_mm(struct mm_struct
*prev
,
64 struct mm_struct
*next
)
66 switch_mm(prev
, next
, current
);
67 set_fs(current
->thread
.mm_segment
);
70 #endif /* __S390_MMU_CONTEXT_H */