patch-2.3.99-pre8 linux/include/asm-s390/mmu_context.h

• Lines: 46
• Date: Fri May 12 11:41:44 2000
• Orig file: v2.3.99-pre7/linux/include/asm-s390/mmu_context.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre7/linux/include/asm-s390/mmu_context.h linux/include/asm-s390/mmu_context.h
@@ -0,0 +1,45 @@
+/*
+ *  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)        do { } while (0)
+
+#define destroy_context(mm)             flush_tlb_mm(mm)
+
+static inline void enter_lazy_tlb(struct mm_struct *mm,
+                                  struct task_struct *tsk, unsigned cpu)
+{
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+                             struct task_struct *tsk, unsigned cpu)
+{
+        unsigned long pgd;
+
+        if (prev != next) {
+                pgd = (__pa(next->pgd) & PAGE_MASK) | _SEGMENT_TABLE;
+                /* Load page tables */
+                asm volatile("    lctl  7,7,%0\n"   /* secondary space */
+                             "    lctl  13,13,%0\n" /* home space */
+                             : : "m" (pgd) );
+        }
+	set_bit(cpu, &next->cpu_vm_mask);
+}
+
+extern inline void activate_mm(struct mm_struct *prev,
+                               struct mm_struct *next)
+{
+        switch_mm(prev, next, current, smp_processor_id());
+}
+
+#endif