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Signed-off-by: Sriprad Potukuchi <[email protected]>
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title: "GSoC'24: UEFI Graphics Output Protocol Support in Unikraft, Part IV" | ||
description: | | ||
This is the fourth post in a series of posts where I talk about my progress with the project. | ||
publishedDate: 2024-08-22 | ||
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), [Part II](https://unikraft.org/blog/2024-07-10-gsoc-uefi-gop) and [Part III](https://unikraft.org/blog/2024-08-07-gsoc-uefi-gop) of this series. | ||
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## Progress | ||
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All the work referred to here can be found in [this draft PR](https://github.com/unikraft/unikraft/pull/1448). | ||
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## ASCII code support | ||
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Added support for ASCII codes `\a`, `\b`, `\t`. | ||
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## Colored output support | ||
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Enabling the configuration option `CONFIG_LIBUKDEBUG_ANSI_COLOR` generates colored logs with the use of ANSI escape codes. | ||
These codes are now parsed and the logs are colored appropriately by the GOP console. | ||
All the new code has been pushed to the [draft PR](https://github.com/unikraft/unikraft/pull/1448)! | ||
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<Image | ||
src="/images/uefi-gop-colored.png" | ||
title="Parsing ANSI escape codes and coloring log output" | ||
/> | ||
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ANSI escape codes control various paramters of text output such as foreground color, background color, formatting etc. | ||
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These escape codes are prefixed with the escape character, which has the ASCII value `27` or `033` in octal or `0x1b` in hex. | ||
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The format of ANSI color codes is `\033[<code>m`. | ||
There are many of these codes, but the focus of my implementation is on parsing just the color codes that the Unikraft kernel outputs in in logs when `CONFIG_LIBUKDEBUG_ANSI_COLOR` is on, which currently are: | ||
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| Color Name | Foreground Color Code | Background Color Code | | ||
| :--------- | :-------------------- | :-------------------- | | ||
| Reset | `0` | `0` | | ||
| Black | `30` | `40` | | ||
| Red | `31` | `41` | | ||
| Green | `32` | `42` | | ||
| Yellow | `33` | `43` | | ||
| Blue | `34` | `44` | | ||
| Magenta | `35` | `45` | | ||
| Cyan | `36` | `46` | | ||
| White | `37` | `47` | | ||
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Full reference [here](https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797). | ||
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For example, `\033[37m\033[44mHello World!` would print `Hello World!` in white on a blue background. The order in which the foreground and the background sequences are issued does not matter. | ||
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## Acknowledgement | ||
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I would once again like to thank all the great Unikraft folk for their continued support! This work would not have been possible without them :heart: |
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