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VideoPortRestoreWCMemory routine

The VideoPortRestoreWCMemory callback routine restores Write Combined video memory from a protected state after the VideoPortProtectWCMemory callback routine was called.

Syntax


RESTORE_WC_MEMORY VideoPortRestoreWCMemory;

VP_STATUS VideoPortRestoreWCMemory(
  _In_ PVOID Context,
  _In_ PVOID HwDeviceExtension
)
{ ... }

Parameters

Context [in]

Pointer to a caller-determined context parameter to be passed to the CallbackRoutine. It typically points to the VIDEO_PORT_CONFIG_INFO buffer.

HwDeviceExtension [in]

Pointer to the miniport driver's hardware device extension.

Return value

VideoPortRestoreWCMemory returns NO_ERROR if it successfully restored Write Combined video memory; otherwise, it returns an error status of ERROR_INVALID_FUNCTION or ERROR_NOT_ENOUGH_MEMORY.

Remarks

After the VideoPortProtectWCMemory callback routine is called, the CPU cannot write to Write Combined memory until VideoPortRestoreWCMemory is called.

Requirements

Target platform

Desktop

Version

Available in Windows 2000 and later versions of the Windows operating systems.

Header

Video.h (include Video.h)

See also

VIDEO_PORT_CONFIG_INFO
VideoPortProtectWCMemory

 

 

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