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

[Simon Glass]

On 6 November 2014 20:49, Bin Meng <bmeng.cn at gmail.com> wrote:
> On Fri, Nov 7, 2014 at 4:20 AM, Simon Glass <sjg at chromium.org> wrote:
>> 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
>> --
>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>

Applied to u-boot-x86.