target/linux/coldfire/patches/053-mcfv4e_brcache_inval.patch

   1 From eba69831e8f35174e2e15e373a66f40dc0be8929 Mon Sep 17 00:00:00 2001
   2 From: Kurt Mahan <kmahan@freescale.com>
   3 Date: Wed, 14 May 2008 12:23:12 -0600
   4 Subject: [PATCH] Force branch-cache invalidate on task switch.
   5
   6 When finishing a task switch make sure the branch cache
   7 gets invalidated to ensure no stale entries exist for
   8 the next user space.
   9
  10 LTIBName: mcfv4e-brcache-inval
  11 Signed-off-by: Kurt Mahan <kmahan@freescale.com>
  12 ---
  13  include/asm-m68k/system.h |   15 +++++++++++++++
  14  1 files changed, 15 insertions(+), 0 deletions(-)
  15
  16 --- a/include/asm-m68k/system.h
  17 +++ b/include/asm-m68k/system.h
  18 @@ -5,9 +5,24 @@
  19  #include <linux/kernel.h>
  20  #include <asm/segment.h>
  21  #include <asm/entry.h>
  22 +#include <asm/cfcache.h>
  23
  24  #ifdef __KERNEL__
  25
  26 +#ifdef CONFIG_COLDFIRE
  27 +#define FLUSH_BC        (0x00040000)
  28 +
  29 +#define finish_arch_switch(prev) do {          \
  30 +       unsigned long tmpreg;                   \
  31 +       asm volatile ( "move.l %2,%0\n"         \
  32 +                      "orl %1,%0\n"            \
  33 +                      "movec %0,%%cacr"        \
  34 +                      : "=&d" (tmpreg)         \
  35 +                      : "id" (FLUSH_BC), "m" (shadow_cacr));   \
  36 +       } while(0)
  37 +
  38 +#endif
  39 +
  40  /*
  41   * switch_to(n) should switch tasks to task ptr, first checking that
  42   * ptr isn't the current task, in which case it does nothing.  This