// uart.h

UART_HARDWARE_READ_ULONG64 UartHardwareReadUlong64;

ULONG64 UartHardwareReadUlong64(
  PULONG64 Address
)
{...}
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Windows Driver Kit DDI reference (nc-uart-uart_hardware_read_ulong64)

UART_HARDWARE_READ_ULONG64 callback function

Description

Reads a ULONG64 value from the specified port address.

Parameters

`Address`

A pointer to the register address, which must be a mapped range in memory space.

Return value

Returns ULONG64 that is read from the specified register address.

Prototype

//Declaration

UART_HARDWARE_READ_ULONG64 UartHardwareReadUlong64;

// Definition

ULONG64 UartHardwareReadUlong64
(
    PULONG64 Address
)
{...}

Remarks

Register your implementation of this callback function by setting the ReadRegister64 member of the _UART_HARDWARE_ACCESS structure.

UART_HARDWARE_READ_ULONG64 - NtDoc