K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2018-03-13T17:10:52.414458Z
K 7
svn:log
V 524
EFIRT: SetVirtualAddressMap with 1:1 mapping after exiting boot services

This fixes a problem encountered on the Lenovo Thinkpad X220/Yoga 11e where
runtime services would try to inexplicably jump to other parts of memory
where it shouldn't be when attempting to enumerate EFI vars, causing a
panic.

The virtual mapping is enabled by default and can be disabled by setting
efi_disable_vmap in loader.conf(5).

Reviewed by:	kib (earlier version)
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D14677

END