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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-08-21 19:23:38 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-20 14:58:35 +0100
commitd84b47115a04d9f6b0da777e8aa8cd930d5b6b8b (patch)
tree7ec15930b462387c6f740d9acb82c854c5cf7d87 /arch/arm/mm/context.c
parent1b2e2b73b4c84c918686c04a00724197036c0847 (diff)
[ARM] Move mmu.c out of the way
Rename mmu.c to context.c - it's the ARMv6 ASID context handling code rather than generic "mmu" handling code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/context.c')
-rw-r--r--arch/arm/mm/context.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c
new file mode 100644
index 00000000000..79e80020242
--- /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;
+}