| Log Message: |
MFC r346996:
Restore x18 in efi_arch_leave.
Some UEFI implementations trash this register and, as we use it as a
platform register, the kernel doesn't save it before calling into the UEFI
runtime services. As we have a copy in tpidr_el1 restore from there when
exiting the EFI environment.
PR: 237234, 237055
Reviewed by: manu
Tested On: Ampere eMAG
Sponsored by: DARPA, AFRL
Sponsored by: Ampere Computing (hardware)
Differential Revision: https://reviews.freebsd.org/D20127
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stable/12/
stable/12/sys/arm64/arm64/efirt_machdep.c