VP_STATUS VgaSetMode	(	PHW_DEVICE_EXTENSION	HwDeviceExtension,
		PVIDEO_MODE	Mode,
		ULONG	ModeSize,
		PULONG	PhysPtrChange
	)
Definition at line 354 of file modeset.c.
Referenced by VgaStartIO().
{
    PVIDEOMODE pRequestedMode;
    VP_STATUS status;
    ULONG RequestedModeNum;
// eVb: 2.3 [SET MODE] - Add new output parameter for framebuffer update functionality
    *PhysPtrChange = FALSE;
// eVb: 2.3 [END]
    //
    // Check if the size of the data in the input buffer is large enough.
    //

    if (ModeSize < sizeof(VIDEO_MODE))
    {
        return ERROR_INSUFFICIENT_BUFFER;
    }

    //
    // Extract the clear memory, and map linear bits.
    //

    RequestedModeNum = Mode->RequestedMode &
        ~(VIDEO_MODE_NO_ZERO_MEMORY | VIDEO_MODE_MAP_MEM_LINEAR);


    if (!(Mode->RequestedMode & VIDEO_MODE_NO_ZERO_MEMORY))
    {
#if defined(_X86_)
        VgaZeroVideoMemory(HwDeviceExtension);
#endif
    }

    //
    // Check to see if we are requesting a valid mode
    //
// eVb: 2.4 [CIRRUS] - Remove Cirrus-specific check for valid mode
    if ( (RequestedModeNum >= NumVideoModes) )
// eVb: 2.4 [END]
    {
        VideoDebugPrint((0, "Invalide Mode Number = %d!\n", RequestedModeNum));

        return ERROR_INVALID_PARAMETER;
    }

    VideoDebugPrint((2, "Attempting to set mode %d\n",
                        RequestedModeNum));
// eVb: 2.5 [VBE] - Use dynamic VBE mode list instead of hard-coded VGA list
    pRequestedMode = &VgaModeList[RequestedModeNum];
// eVb: 2.5 [END]
    VideoDebugPrint((2, "Info on Requested Mode:\n"
                        "\tResolution: %dx%d\n",
                        pRequestedMode->hres,
                        pRequestedMode->vres ));

    //
    // VESA BIOS mode switch
    //
// eVb: 2.6 [VBE] - VBE Mode Switch Support 
    status = VbeSetMode(HwDeviceExtension, pRequestedMode, PhysPtrChange);
    if (status == ERROR_INVALID_FUNCTION)
    {
        //
        // VGA mode switch
        //

        if (!pRequestedMode->CmdStream) return ERROR_INVALID_FUNCTION;
        if (!VgaInterpretCmdStream(HwDeviceExtension, pRequestedMode->CmdStream)) return ERROR_INVALID_FUNCTION;
        goto Cleanup;
    }
    else if (status != NO_ERROR) return status;
// eVb: 2.6 [END]
// eVb: 2.7 [MODE-X] - Windows VGA Miniport Supports Mode-X, we should too
    //
    // ModeX check
    //
    
    if (pRequestedMode->hres == 320)
    {
        VideoPortDebugPrint(0, "ModeX not support!!!\n");
        return ERROR_INVALID_PARAMETER;
    }
// eVb: 2.7 [END]
    //
    // Text mode check
    //
    
    if (!(pRequestedMode->fbType & VIDEO_MODE_GRAPHICS))
    {
// eVb: 2.8 [TODO] - This code path is not implemented yet
        VideoPortDebugPrint(0, "Text-mode not support!!!\n");
        return ERROR_INVALID_PARAMETER;
// eVb: 2.8 [END]
    }

Cleanup:
    //
    // Update the location of the physical frame buffer within video memory.
    //
// eVb: 2.9 [VBE] - Linear and banked support is unified in VGA, unlike Cirrus
    HwDeviceExtension->PhysicalVideoMemoryBase.LowPart = pRequestedMode->PhysBase;
    HwDeviceExtension->PhysicalVideoMemoryLength = pRequestedMode->PhysSize;

    HwDeviceExtension->PhysicalFrameLength =
            pRequestedMode->FrameBufferSize;

    HwDeviceExtension->PhysicalFrameOffset.LowPart =
            pRequestedMode->FrameBufferBase;
// eVb: 2.9 [END]

    //
    // Store the new mode value.
    //

    HwDeviceExtension->CurrentMode = pRequestedMode;
    HwDeviceExtension->ModeIndex = Mode->RequestedMode;

    return NO_ERROR;

} //end VgaSetMode()
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