1 files changed, 54 insertions, 0 deletions

diff --git a/include/asm-s390/mmu_context.h b/include/asm-s390/mmu_context.h
new file mode 100644
index 000000000000..3a3bb3f2dad5
--- /dev/null
+++ b/include/asm-s390/mmu_context.h
@@ -0,0 +1,54 @@
+/*
+ *  include/asm-s390/mmu_context.h
+ *
+ *  S390 version
+ *
+ *  Derived from "include/asm-i386/mmu_context.h"
+ */
+
+#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
+
+#define destroy_context(mm)             do { } while (0)
+
+static inline void enter_lazy_tlb(struct mm_struct *mm,
+                                  struct task_struct *tsk)
+{
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+                             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__ */
+        }
+        cpu_set(smp_processor_id(), next->cpu_vm_mask);
+}
+
+#define deactivate_mm(tsk,mm)   do { } while (0)
+
+extern inline void activate_mm(struct mm_struct *prev,
+                               struct mm_struct *next)
+{
+        switch_mm(prev, next, current);
+        set_fs(current->thread.mm_segment);
+}
+
+#endif