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43 lines
1.2 KiB
Diff
43 lines
1.2 KiB
Diff
From eba69831e8f35174e2e15e373a66f40dc0be8929 Mon Sep 17 00:00:00 2001
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From: Kurt Mahan <kmahan@freescale.com>
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Date: Wed, 14 May 2008 12:23:12 -0600
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Subject: [PATCH] Force branch-cache invalidate on task switch.
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When finishing a task switch make sure the branch cache
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gets invalidated to ensure no stale entries exist for
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the next user space.
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LTIBName: mcfv4e-brcache-inval
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Signed-off-by: Kurt Mahan <kmahan@freescale.com>
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---
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include/asm-m68k/system.h | 15 +++++++++++++++
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1 files changed, 15 insertions(+), 0 deletions(-)
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--- a/include/asm-m68k/system.h
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+++ b/include/asm-m68k/system.h
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@@ -5,9 +5,24 @@
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#include <linux/kernel.h>
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#include <asm/segment.h>
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#include <asm/entry.h>
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+#include <asm/cfcache.h>
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#ifdef __KERNEL__
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+#ifdef CONFIG_COLDFIRE
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+#define FLUSH_BC (0x00040000)
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+
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+#define finish_arch_switch(prev) do { \
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+ unsigned long tmpreg; \
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+ asm volatile ( "move.l %2,%0\n" \
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+ "orl %1,%0\n" \
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+ "movec %0,%%cacr" \
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+ : "=&d" (tmpreg) \
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+ : "id" (FLUSH_BC), "m" (shadow_cacr)); \
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+ } while(0)
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+
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+#endif
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+
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/*
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* switch_to(n) should switch tasks to task ptr, first checking that
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* ptr isn't the current task, in which case it does nothing. This
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