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x86: Invalidate TLB as early as possible

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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>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2014-11-06 13:20:03 -07:00
parent 85d87328ea
commit 3c00695ee1
1 changed files with 3 additions and 0 deletions
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3
arch/x86/cpu/start16.S
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@ -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