KbcEmulDxe

Overview

This DXE driver provides keyboard controller (KBC) emulation for systems where the traditional i8042 PS/2 keyboard controller is not physically present. It reads the "UsbSupport" UEFI variable to determine if USB keyboard emulation should be enabled, installs timer-based polling callbacks, and communicates with the Super I/O (SIO) protocol to manage keyboard IRQ routing and legacy I/O port access.

Key Functions

• KbcEmulDriverEntry -- Main entry point; reads UsbSupport variable and initializes KBC emulation
• KbcEmulTimerCallback -- Periodic timer handler that polls for USB keyboard input and emulates legacy KBC responses
• KbcEmulDisableKeyboard -- Disables keyboard emulation and cleans up timer events
• SioProtocolWrite / SioProtocolRead -- Super I/O protocol wrappers for configuring keyboard-related SIO registers
• CmosReadComPortType -- Reads COM port type configuration from CMOS

Dependencies

• UsbSupport UEFI variable
• Super I/O (SIO) Protocol for keyboard controller register access
• UEFI Timer Services (periodic timer callbacks)
• UEFI Boot/Runtime Services

Platform

X64 UEFI DXE driver, PE32+ format, 6 sections (.text, .rdata, .data, section_3, .xdata, .reloc). Part of AmiModulePkg.