PS/2 policy protocol abstracts the specific platform initialization and setting.
Include/Protocol/Ps2Policy.h

PROTOCOL Information

PROTOCOL's Guid Name	PROTOCOL's Guid
gEfiPs2PolicyProtocolGuid	{ 0x4DF19259, 0xDC71, 0x4D46, { 0xBE, 0xF1, 0x35, 0x7B, 0xB5, 0x78, 0xC4, 0x18 } }

Refer to Header File