[U-Boot] [PATCH 11/39] x86: Invalidate TLB as early as possible

We should invalidate the TLB right at the start to ensure that we don't get false address translations even though paging is disabled.

Signed-off-by: Simon Glass sjg@chromium.org ---

arch/x86/cpu/start16.S | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/arch/x86/cpu/start16.S b/arch/x86/cpu/start16.S index e718d4b..445d5a1 100644 --- a/arch/x86/cpu/start16.S +++ b/arch/x86/cpu/start16.S @@ -24,6 +24,9 @@ start16: /* Set the Cold Boot / Hard Reset flag */ movl $GD_FLG_COLD_BOOT, %ebx

+ xorl %eax, %eax + movl %eax, %cr3 /* Invalidate TLB */ + /* Turn off cache (this might require a 486-class CPU) */ movl %cr0, %eax orl $(X86_CR0_NW | X86_CR0_CD), %eax