// uart.h

UART_HARDWARE_READ_ULONG UartHardwareReadUlong;

ULONG UartHardwareReadUlong(
  PULONG Address
)
{...}
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Windows Driver Kit DDI reference (nc-uart-uart_hardware_read_ulong)

UART_HARDWARE_READ_ULONG callback function

Description

Reads a ULONG value from the specified port or register.

Parameters

`Address`

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

Return value

Returns the ULONG value that is read from the specified port or register.

Prototype

//Declaration

UART_HARDWARE_READ_ULONG UartHardwareReadUlong;

// Definition

ULONG UartHardwareReadUlong
(
    PULONG Address
)
{...}

Remarks

Register your implementation of this callback function by setting the ReadPort32 or ReadRegister32 member of the _UART_HARDWARE_ACCESS structure.

UART_HARDWARE_READ_ULONG - NtDoc