tree f487163b3e28006dbe9023ae8c6c3abfbd211461
parent 7dfe8bdeef7f8a7223fb39e04faaa5c7489feb3f
author Simon Glass <sjg@chromium.org> 1438713235 -0600
committer Simon Glass <sjg@chromium.org> 1438785847 -0600

x86: Add a way to call 32-bit code from 64-bit mode

The procedure to drop from 64-bit mode to 32-bit is a bit messy. Add a
function to take care of it. It requires identity-mapped pages and that
the calling code is running below 4GB.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>