From d84b47115a04d9f6b0da777e8aa8cd930d5b6b8b Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 21 Aug 2006 19:23:38 +0100 Subject: [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 --- arch/arm/mm/context.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 arch/arm/mm/context.c (limited to 'arch/arm/mm/context.c') 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 +#include +#include + +#include +#include + +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; +} -- cgit v1.2.3