x86: Add support for 64-bit relocation
Add a 64-bit relocation function. SPL loads U-Boot into RAM at a fixed address and runs it. U-Boot then relocates itself to the top of RAM using this relocation function. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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