SerialIo

Index	Module	Size	Phase
133	SerialIo	17,248 bytes (17 KB)	Decompiled

SerialIo implements the EFI_SERIAL_IO_PROTOCOL on top of NS16550/PC16550D-compatible UART hardware. It supports three access backends -- legacy I/O (in/out instructions on ISA UARTs COM1-COM10), PCI I/O protocol (MMIO or I/O) on PCI UARTs, and direct MMIO register access. The driver follows the UEFI Driver Binding pattern, detecting UART type via device path probing and allocating a SERIAL_IO_PRIVATE context with automatic FIFO detection through the standard 8250/16550 loopback test.

Key Functions

SerialIoDriverBindingSupported, SerialIoDriverBindingStart, SerialIoDriverBindingStop
SerialIoReset, SerialIoSetAttributes, SerialIoSetControl, SerialIoGetControl
SerialIoWrite, SerialIoRead
UartReadRegister, UartWriteRegister (dispatch to legacy/PCI/MMIO backends)
SerialIoComponentNameGetDriverName, SerialIoComponentNameGetControllerName

Dependencies

EFI_SERIAL_IO_PROTOCOL, EFI_DEVICE_PATH_PROTOCOL, EFI_PCI_IO_PROTOCOL
UefiBootServicesTableLib, UefiRuntimeServicesTableLib, BaseMemoryLib, DebugLib

Platform

x86-64, PE32+, UEFI DXE driver, 6 sections (.text/.rdata/.data/section_3/.xdata/.reloc), entry at 0x390