GOP (Graphic Output Protocol) driver 是 EFI架構下取代傳統VBIOS 黑箱的 EFI Driver, 另外for embedded system bootloader 上的graphic driver叫EPOG(embedded Pre-OS Graphic). GOP Driver 的共有GUID #define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID \ {0x9042a9de,0x23dc,0x4a38, \ 0x96,0xfb,0x7a,0xde,0xd0,0x80,0x51,0x6a} Protocol 主要包含3個function 及 1個data structure typedef struct EFI_GRAPHICS_OUTPUT_PROTCOL { EFI_GRAPHICS_OUTPUT_PROTOCOL_QUERY_MODE QueryMode ; EFI_GRAPHICS_OUTPUT_PROTOCOL_SET_MODE SetMode ; EFI_GRAPHICS_OUTPUT_PROTOCOL_BLT Blt ; EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE *Mode; } EFI_GRAPHICS_OUTPUT_PROTOCOL; QueryMode: Returns information for an available graphics mode that the graphics device and the set of active video output devices supports.(是詢問graphic controller 和 系統所有接上的顯示器所支援的顯示模式) SetMode:Set the video device into the specified mode and clears the visible portions of the output display to black. 則是設定顯示裝置一個特定的顯示模式 Blt:Software abstraction to draw on the video device'