Kernel: Add ioctl to get the EDID from a framebuffer

Author: https://github.com/tomuta
Commit: 03c45b1865
Pull-request: https://github.com/SerenityOS/serenity/pull/11439
Reviewed-by: https://github.com/kleinesfilmroellchen
Reviewed-by: https://github.com/linusg ✅

Kernel/Graphics/Bochs/GraphicsAdapter.cpp

@@ -276,4 +276,15 @@ void BochsGraphicsAdapter::disable_consoles()
     m_framebuffer_device->activate_writes();
 }
 
+ErrorOr<ByteBuffer> BochsGraphicsAdapter::get_edid(size_t output_port_index) const
+{
+    if (output_port_index != 0)
+        return Error::from_errno(ENODEV);
+
+    auto bytes = ByteBuffer::copy(const_cast<u8 const*>(m_registers->edid_data), sizeof(m_registers->edid_data));
+    if (!bytes.has_value())
+        return Error::from_errno(ENOMEM);
+    return bytes.release_value();
+}
+
 }