PGET_WALL_CLOCK_REGISTER callback function (hdaudio.h)

Article
02/22/2024

The GetWallClockRegister routine retrieves a pointer to the wall clock register.

The function pointer type for a GetWallClockRegister routine is defined as follows.

Syntax

PGET_WALL_CLOCK_REGISTER PgetWallClockRegister;

void PgetWallClockRegister(
  [in]  PVOID _context,
  [out] PULONG *Wallclock
)
{...}

Parameters

[in] _context

Specifies the context value from the Context member of the HDAUDIO_BUS_INTERFACE, HDAUDIO_BUS_INTERFACE_V2, or HDAUDIO_BUS_INTERFACE_BDL structure.

[out] Wallclock

Retrieves a pointer to the wall clock register. This parameter points to a caller-allocated PULONG variable into which the routine writes a pointer to the register. The HD Audio bus driver maps the register to a system virtual address that is accessible to the function driver.

Return value

None

Remarks

For more information, see Wall Clock and Link Position Registers.

Requirements

Requirement	Value
Target Platform	Desktop
Header	hdaudio.h (include Hdaudio.h)
IRQL	<=DISPATCH_LEVEL