DXGKCB_AGP_SET_COMMAND callback function

The AgpSetCommand function sets the AGP rate and specifies whether side band addressing and fast write transactions are enabled.

Syntax

DXGKCB_AGP_SET_COMMAND DxgkcbAgpSetCommand;

NTSTATUS DxgkcbAgpSetCommand(
  HANDLE Context,
  ULONG Command
)
{...}

Parameters

Context

A handle to a context block that is associated with an AGP interface. The display miniport driver previously received this handle in the Context member of the DXGK_AGP_INTERFACE structure that was filled in by DxgkCbQueryServices.

Command

A set of flags that specify the AGP rate and the types of AGP transactions that will be used.

The caller must set one, and only one, of the following flags.

Flag Meaning
DXGK_AGPCOMMAND_AGP1X The AGP transfer rate is 1X.
DXGK_AGPCOMMAND_AGP2X The AGP transfer rate is 2X.
DXGK_AGPCOMMAND_AGP4X The AGP transfer rate is 4X.
DXGK_AGPCOMMAND_AGP8X The AGP transfer rate is 8X.

The caller might also choose to set or clear the following flags.

Flag Meaning
DXGK_AGPCOMMAND_DISABLE_SBA If this flag is set, side band addressing is disabled. If this flag is cleared, side band addressing is enabled.
DXGK_AGPCOMMAND_DISABLE_FW If this flag is set, fast write transactions are disabled. If this flag is cleared, fast write transactions are enabled. Note that fast write transactions cannot be used with AGP1X.

Return Value

AgpSetCommand returns STATUS_SUCCESS if it succeeds. Otherwise, it returns one of the error codes defined in Ntstatus.h.

Remarks

None.

Requirements

   
Minimum supported client Available in Windows Vista and later versions of the Windows operating systems.
Target Platform Desktop
Header dispmprt.h (include Dispmprt.h)
IRQL PASSIVE_LEVEL

See Also

AgpAllocatePool

AgpFreePool

DXGK_AGP_INTERFACE

DxgkCbQueryServices