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

[Simon Glass]

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 at 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
-- 
2.1.0.rc2.206.gedb03e5