K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2020-04-01T03:27:47.941576Z
K 7
svn:log
V 288
Add support for AHCI BIOS/OS Handoff.

This allows clean handoff from BIOS implementing some asynchronous I/O to
the OS AHCI driver.  During attach driver declares OS ownership request
and waits from 25ms to 2s for BIOS to complete operation and release the
hardware.

MFC after:	2 weeks

END