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>
13 #include <asm/uaccess.h>
14 #include <asm-generic/mm_hooks.h>
16 static inline int init_new_context(struct task_struct *tsk,
19 mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
21 mm->context.asce_bits |= _ASCE_TYPE_REGION3;
23 mm->context.noexec = s390_noexec;
27 #define destroy_context(mm) do { } while (0)
30 #define LCTL_OPCODE "lctl"
32 #define LCTL_OPCODE "lctlg"
35 static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
39 S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
41 /* Load primary space page table origin. */
42 pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
43 S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
44 asm volatile(LCTL_OPCODE" 1,1,%0\n"
45 : : "m" (S390_lowcore.user_exec_asce) );
47 /* Load home space page table origin. */
48 asm volatile(LCTL_OPCODE" 13,13,%0"
49 : : "m" (S390_lowcore.user_asce) );
52 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
53 struct task_struct *tsk)
55 if (unlikely(prev == next))
57 cpu_set(smp_processor_id(), next->cpu_vm_mask);
61 #define enter_lazy_tlb(mm,tsk) do { } while (0)
62 #define deactivate_mm(tsk,mm) do { } while (0)
64 static inline void activate_mm(struct mm_struct *prev,
65 struct mm_struct *next)
67 switch_mm(prev, next, current);
68 set_fs(current->thread.mm_segment);
71 #endif /* __S390_MMU_CONTEXT_H */