// uart.h

UART_HARDWARE_WRITE_ULONG UartHardwareWriteUlong;

VOID UartHardwareWriteUlong(
  PULONG Address,
  ULONG Value
)
{...}
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Windows Driver Kit DDI reference (nc-uart-uart_hardware_write_ulong)

UART_HARDWARE_WRITE_ULONG callback function

Description

Writes a ULONG value to the specified port or register.

Parameters

`Address`

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

`Value`

A ULONG value to be written to the port or register.

Prototype

//Declaration

UART_HARDWARE_WRITE_ULONG UartHardwareWriteUlong;

// Definition

VOID UartHardwareWriteUlong
(
    PULONG Address
    ULONG Value
)
{...}

Remarks

Register your implementation of this callback function by setting the WritePort32 or WriteRegister32 member of the _UART_HARDWARE_ACCESS structure.

UART_HARDWARE_WRITE_ULONG - NtDoc