// uart.h

UART_HARDWARE_READ_UCHAR UartHardwareReadUchar;

UCHAR UartHardwareReadUchar(
  PUCHAR Address
)
{...}
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Windows Driver Kit DDI reference (nc-uart-uart_hardware_read_uchar)

UART_HARDWARE_READ_UCHAR callback function

Description

Reads a byte from the specified port or register.

Parameters

`Address`

A pointer to a variable that contains the port or register address.

Return value

Returns the byte that is read from the specified port or register.

Prototype

//Declaration

UART_HARDWARE_READ_UCHAR UartHardwareReadUchar;

// Definition

UCHAR UartHardwareReadUchar
(
    PUCHAR Address
)
{...}

Remarks

Register your implementation of this callback function by setting the ReadPort8 or ReadRegister8 member of the _UART_HARDWARE_ACCESS structure.

UART_HARDWARE_READ_UCHAR - NtDoc