#ifndef __S390_MMU_CONTEXT_H
#define __S390_MMU_CONTEXT_H
-/*
- * get a new mmu context.. S390 don't know about contexts.
- */
-#define init_new_context(tsk,mm) 0
+#include <asm/pgalloc.h>
+#include <asm-generic/mm_hooks.h>
+
+static inline int init_new_context(struct task_struct *tsk,
+ struct mm_struct *mm)
+{
+ mm->context = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
+#ifdef CONFIG_64BIT
+ mm->context |= _ASCE_TYPE_REGION3;
+#endif
+ return 0;
+}
#define destroy_context(mm) do { } while (0)
-static inline void enter_lazy_tlb(struct mm_struct *mm,
- struct task_struct *tsk)
+#ifndef __s390x__
+#define LCTL_OPCODE "lctl"
+#else
+#define LCTL_OPCODE "lctlg"
+#endif
+
+static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
{
+ S390_lowcore.user_asce = mm->context | __pa(mm->pgd);
+ if (switch_amode) {
+ /* Load primary space page table origin. */
+ pgd_t *shadow_pgd = get_shadow_table(mm->pgd) ? : mm->pgd;
+ S390_lowcore.user_exec_asce = mm->context | __pa(shadow_pgd);
+ asm volatile(LCTL_OPCODE" 1,1,%0\n"
+ : : "m" (S390_lowcore.user_exec_asce) );
+ } else
+ /* Load home space page table origin. */
+ asm volatile(LCTL_OPCODE" 13,13,%0"
+ : : "m" (S390_lowcore.user_asce) );
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
- struct task_struct *tsk)
+ struct task_struct *tsk)
{
- if (prev != next) {
-#ifndef __s390x__
- S390_lowcore.user_asce = (__pa(next->pgd)&PAGE_MASK) |
- (_SEGMENT_TABLE|USER_STD_MASK);
- /* Load home space page table origin. */
- asm volatile("lctl 13,13,%0"
- : : "m" (S390_lowcore.user_asce) );
-#else /* __s390x__ */
- S390_lowcore.user_asce = (__pa(next->pgd) & PAGE_MASK) |
- (_REGION_TABLE|USER_STD_MASK);
- /* Load home space page table origin. */
- asm volatile("lctlg 13,13,%0"
- : : "m" (S390_lowcore.user_asce) );
-#endif /* __s390x__ */
- }
+ if (unlikely(prev == next))
+ return;
cpu_set(smp_processor_id(), next->cpu_vm_mask);
+ update_mm(next, tsk);
}
+#define enter_lazy_tlb(mm,tsk) do { } while (0)
#define deactivate_mm(tsk,mm) do { } while (0)
static inline void activate_mm(struct mm_struct *prev,
set_fs(current->thread.mm_segment);
}
-#endif
+#endif /* __S390_MMU_CONTEXT_H */