UEFI virtual video controller
An information handling system includes a processor; a memory, a firmware, and a video agent. The memory includes a frame buffer for image data. The frame buffer accessible to an operating system. The firmware is configured to present to the operating system a graphics output protocol. The graphics output protocol includes an address of the portion of the reserved portion of the memory and soft video display parameters. The video agent is configured to retrieve image data from the reserved portion of the memory, and provide the image data to an external system for remote video display to be completed upon finalization of application.
1. An information handling system without video hardware and associated connectors, comprising:
a processor;
a system memory;
a firmware configured to:
initialize a soft video controller, the soft video controller including instructions to:
reserve a portion of the system memory as a frame buffer and mark the memory as unavailable for an operating system to allocate to another process; and
present to the operating system a graphics output protocol, the graphics output protocol including an address of the portion of the reserved portion of the memory and soft video display parameters; and
a video agent configured to:
retrieve image data from the frame buffer; and
provide the image data to an external system for remote video display;
wherein the video agent is configured to provide image data to the external system prior to and after control of the information handling system being handed off to the operating system.
2. The information handling system of claim 1 , wherein the graphics output protocol is a Unified Extensible Firmware Interface graphics output protocol.
3. The information handling system of claim 1 , wherein the soft video display parameters include a resolution and a pixel format.
4. The information handling system of claim 3 , wherein resolution includes a 1024 pixel vertical resolution and a 768 pixel horizontal resolution.
5. The information handling system of claim 1 , wherein the memory is a dynamic random access memory.
6. The information handling system of claim 1 , wherein the video agent includes direct memory access.
7. A method for operating an information handling system without video hardware and associated connectors, comprising:
reserving a portion of system memory as a frame buffer;
initializing a graphics output protocol with a pointer to the frame buffer;
providing to an operating system display parameters and the pointer to the frame buffer;
writing image data, by the operating system, to the frame buffer;
accessing the frame buffer, by a video agent, to retrieve the image data; and
providing the image data retrieved from the frame buffer by the video agent to an external system prior to and after control of the information handling system being handed off to the operating system.
8. The method of claim 7 , wherein the system memory is a dynamic random access memory.
9. The method of claim 7 , wherein graphics output protocol is a Unified Extensible Firmware Interface graphics output protocol.
10. The method of claim 7 , wherein the display parameters include a resolution and a pixel format.
11. The method of claim 10 , wherein resolution includes a 1024 pixel vertical resolution and a 768 pixel horizontal resolution.
12. The method of claim 7 , wherein accessing the frame buffer by the video agent utilizes direct memory access.
13. The method of claim 7 , wherein accessing the frame buffer by the video agent utilizes a system management interrupt.
14. An information handling system without video hardware and associated connectors, comprising:
a processor;
an operating system comprising a built-in graphics driver;
a system memory;
a firmware configured to:
initialize a soft video controller; the soft video controller including instructions to:
reserve a portion of the system memory as a frame buffer and mark the memory as unavailable for an operating system to allocate to another process;
provide a block transfer function to manipulate the image data within the frame buffer; and
present to the operating system a graphics output protocol including an address of the frame buffer and soft video display parameters; and
a video agent configured to:
retrieve image data from the frame buffer; and
provide the image data to an external system for remote video display prior to and after control of the information handling system being handed off to the operating system;
wherein the built-in graphics driver is configured to write image data to the frame buffer based on the address of the frame buffer and the video display parameters provided by the graphics output protocol.
15. The information handling system of claim 14 , wherein the graphics output protocol is a Unified Extensible Firmware Interface graphics output protocol.
16. The information handling system of claim 14 , wherein the system memory is a dynamic random access memory.
17. The information handling system of claim 14 , wherein the display parameters include a resolution and a pixel format.
18. The information handling system of claim 17 , wherein resolution includes a 1024 pixel vertical resolution and a 768 pixel horizontal resolution.
19. The information handling system of claim 14 , wherein the video access agent utilizes direct memory access.
20. The information handling system of claim 14 , wherein the video access agent utilizes a system management interrupt.