This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / arm / mm / context.c

diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c
new file mode 100644 (file)
index 0000000..79e8002
--- /dev/null
+++ b/arch/arm/mm/context.c
@@ -0,0 +1,45 @@
+/*
+ *  linux/arch/arm/mm/context.c
+ *
+ *  Copyright (C) 2002-2003 Deep Blue Solutions Ltd, all rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+
+#include <asm/mmu_context.h>
+#include <asm/tlbflush.h>
+
+unsigned int cpu_last_asid = { 1 << ASID_BITS };
+
+/*
+ * We fork()ed a process, and we need a new context for the child
+ * to run in.  We reserve version 0 for initial tasks so we will
+ * always allocate an ASID.
+ */
+void __init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+       mm->context.id = 0;
+}
+
+void __new_context(struct mm_struct *mm)
+{
+       unsigned int asid;
+
+       asid = ++cpu_last_asid;
+       if (asid == 0)
+               asid = cpu_last_asid = 1 << ASID_BITS;
+
+       /*
+        * If we've used up all our ASIDs, we need
+        * to start a new version and flush the TLB.
+        */
+       if ((asid & ~ASID_MASK) == 0)
+               flush_tlb_all();
+
+       mm->context.id = asid;
+}