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blog: Add GSoC'24 UEFI GOP, Part II post
This is the second post that outlines the progress on the UEFI GOP GSoC project, particulary from week four to six. Signed-off-by: procub3r <[email protected]>
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title: "GSoC'24: UEFI Graphics Output Protocol Support in Unikraft, Part II" | ||
description: | | ||
This is the second post in a series of posts where I talk about my progress with the project. | ||
publishedDate: 2024-07-10 | ||
image: /images/unikraft-gsoc24.png | ||
authors: | ||
- Sriprad Potukuchi | ||
tags: | ||
- gsoc | ||
- gsoc24 | ||
- uefi | ||
- booting | ||
--- | ||
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## Project Overview | ||
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The widely available and standardized [UEFI Graphics Output Protocol](https://uefi.org/specs/UEFI/2.10/12_Protocols_Console_Support.html#efi-graphics-output-protocol) (GOP) interface is an excellent alternative to VGA or serial port consoles for printing logs to the screen. | ||
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This project aims to implement a UEFI GOP based console. | ||
For more information, check out [Part I](https://unikraft.org/blog/2024-06-18-gsoc-uefi-gop) of this series. | ||
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## Progress | ||
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- Using a placeholder [font](https://github.com/dhepper/font8x8), it is now possible to print null-terminated strings to the screens. | ||
<Image | ||
src="/images/uefi-gop-first-text-render.png" | ||
/> | ||
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- It is also possible to scale the font in both the axes independently | ||
- No scaling | ||
<Image | ||
src="/images/uefi-gop-scaled-text-1.png" | ||
/> | ||
- Scaled Y-axis | ||
<Image | ||
src="/images/uefi-gop-scaled-text-2.png" | ||
/> | ||
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- I've also implemented scrolling. When all the lines are filled and a new log needs to be printed, the current logs on the screen are scrolled up (using `memcpy`) | ||
<Image | ||
src="/images/uefi-gop-before-scrolling.png" | ||
/> | ||
<Image | ||
src="/images/uefi-gop-after-scrolling.png" | ||
/> | ||
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Right now, scrolling moves all the framebuffer data in place. | ||
Reads and writes in framebuffer memory are slower because the video adapter actually syncs the framebuffer with the screen. | ||
This needs to be optimized! | ||
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## Next Steps | ||
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- Finalize a font! | ||
- Optimize scrolling (by maintaining an additional buffer) | ||
- Look into [this PR](https://github.com/unikraft/unikraft/pull/1464), which adds a generic console interface. | ||
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## Acknowledgement | ||
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I would like to thank all the great Unikraft folk for being a great community! |
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