mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-10-31 14:04:26 -04:00
43 lines
1.2 KiB
Diff
43 lines
1.2 KiB
Diff
From eba69831e8f35174e2e15e373a66f40dc0be8929 Mon Sep 17 00:00:00 2001
|
|
From: Kurt Mahan <kmahan@freescale.com>
|
|
Date: Wed, 14 May 2008 12:23:12 -0600
|
|
Subject: [PATCH] Force branch-cache invalidate on task switch.
|
|
|
|
When finishing a task switch make sure the branch cache
|
|
gets invalidated to ensure no stale entries exist for
|
|
the next user space.
|
|
|
|
LTIBName: mcfv4e-brcache-inval
|
|
Signed-off-by: Kurt Mahan <kmahan@freescale.com>
|
|
---
|
|
include/asm-m68k/system.h | 15 +++++++++++++++
|
|
1 files changed, 15 insertions(+), 0 deletions(-)
|
|
|
|
--- a/include/asm-m68k/system.h
|
|
+++ b/include/asm-m68k/system.h
|
|
@@ -5,9 +5,24 @@
|
|
#include <linux/kernel.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/entry.h>
|
|
+#include <asm/cfcache.h>
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
+#ifdef CONFIG_COLDFIRE
|
|
+#define FLUSH_BC (0x00040000)
|
|
+
|
|
+#define finish_arch_switch(prev) do { \
|
|
+ unsigned long tmpreg; \
|
|
+ asm volatile ( "move.l %2,%0\n" \
|
|
+ "orl %1,%0\n" \
|
|
+ "movec %0,%%cacr" \
|
|
+ : "=&d" (tmpreg) \
|
|
+ : "id" (FLUSH_BC), "m" (shadow_cacr)); \
|
|
+ } while(0)
|
|
+
|
|
+#endif
|
|
+
|
|
/*
|
|
* switch_to(n) should switch tasks to task ptr, first checking that
|
|
* ptr isn't the current task, in which case it does nothing. This
|