/// <summary>
/// Create new instance of the <see cref="VBEDriver"/> class.
/// </summary>
/// <param name="xres">X resolution.</param>
/// <param name="yres">Y resolution.</param>
/// <param name="bpp">BPP (color depth).</param>
public VBEDriver(ushort xres, ushort yres, ushort bpp)
{
PCIDevice videocard;
mScrollSize = (xres * yres) * (bpp / 8);
mRow2Addr = xres * (bpp / 8) * 16;
if (VBE.IsAvailable()) //VBE VESA Enabled Mulitboot Parsing
{
Global.mDebugger.SendInternal($"Creating VBE VESA driver with Mode {xres}*{yres}@{bpp}");
IO.LinearFrameBuffer = new MemoryBlock(VBE.getLfbOffset(), (uint)xres * yres * (uint)(bpp / 8));
}
else if (ISAModeAvailable()) //Bochs Graphics Adaptor ISA Mode
{
Global.mDebugger.SendInternal($"Creating VBE BGA driver with Mode {xres}*{yres}@{bpp}.");
IO.LinearFrameBuffer = new MemoryBlock(0xE0000000, 1920 * 1200 * 4);
VBESet(xres, yres, bpp);
}
else if (((videocard = HAL.PCI.GetDevice(VendorID.VirtualBox, DeviceID.VBVGA)) != null) || //VirtualBox Video Adapter PCI Mode
((videocard = HAL.PCI.GetDevice(VendorID.Bochs, DeviceID.BGA)) != null)) // Bochs Graphics Adaptor PCI Mode
{
Global.mDebugger.SendInternal($"Creating VBE BGA driver with Mode {xres}*{yres}@{bpp}. Framebuffer address=" + videocard.BAR0);
IO.LinearFrameBuffer = new MemoryBlock(videocard.BAR0, 1920 * 1200 * 4);
VBESet(xres, yres, bpp);
}
else
{
throw new Exception("No supported VBE device found.");
}
}
/// <summary>
/// Checks is VBE is supported exists
/// </summary>
/// <returns></returns>
private static bool VBEAvailable()
{
if (BGAExists())
{
return(true);
}
else if (PCI.Exists(VendorID.VirtualBox, DeviceID.VBVGA))
{
return(true);
}
else if (PCI.Exists(VendorID.Bochs, DeviceID.BGA))
{
return(true);
}
else if (VBE.IsAvailable())
{
return(true);
}
else
{
return(false);
}
}