x86, kexec: x86_64: add identity map for pages at image->start
Impact: Fix corner case that cannot yet occur image->start may be outside of 0 ~ max_pfn, for example when jumping back to original kernel from kexeced kenrel. This patch add identity map for pages at image->start. Signed-off-by: NHuang Ying <ying.huang@intel.com> Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
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