tpm(4): add support for tpm2 CRB interface
Some modern tpm2 devices require or prefer drivers communicate via
the CRB interface and not the TIS/fifo interface. This change adds
basic support for detecting CRB start mode and using CRB to issue
commands required for proper S4 hibernation. As a result, this also
defines a new struct definition for the TPM2 acpi table required
for start mode detection.
This fixes recent S4 regressions on the Surface Go 2 caused by a
change in firmware from Microsoft.
Other CRB start methods may need implementing in the future to
support additional hardware.
tested by deraadt@ and many others, ok kettenis@
projects / openbsd / commit