K 10
svn:author
V 6
andrew
K 8
svn:date
V 27
2018-03-20T13:35:20.159490Z
K 7
svn:log
V 582
Check if the gettime runtime service is valid.

The U-Boot efi runtime service expects us to set the address map before
calling any runtime services. It will then remap a few functions to their
runtime version. One of these is the gettime function. If we call into
this without having set a runtime map we get a page fault.

Add a check to see if this is valid in efi_init() so we don't try to use
the possibly invalid pointer.

Reviewed by:	imp, kevans (both previous version)
X-MFC-With:	r330868
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14759

END