[coreboot] [PATCH] flush CPU queue when PE set 0

[Rudolf Marek]

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Hello

Following patch flushes the instruction queue when we set PE=0. This is normally
done by FAR JMP, but here it is more tricky because we run at EIP>1MB. Many
thanks to Marc and Kevin to tell me how to fix it

The trick is to use 0x66 prefix (done with ljmpl) it will allow to jump in real
mode to any EIP addresses ;)

Signed-off-by: Rudolf Marek

Rudolf

===================================================================
- --- arch/i386/boot/wakeup.S	(revision 4106)
+++ arch/i386/boot/wakeup.S	(working copy)
@@ -45,6 +45,8 @@
    movl	%cr0, %eax
    andb	$0xfe,%al
    movl	%eax, %cr0
+	ljmpl $0x0, $cpu_flushed
+cpu_flushed:
    movw	$0x0, %ax
    movw	%ax, %ds
    movw	%ax, %es
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