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* support for arrow keysKartik K. Agaram2021-04-051-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Mu's keyboard handling is currently a bit of a mess, and this commit might be a bad idea. Ideally keyboards would return Unicode. Currently Mu returns single bytes. Mostly ASCII. No support for international keyboards yet. ASCII and Unicode have some keyboard scancodes grandfathered in, that don't really make sense for data transmission. Like backspace and delete. However, other keyboard scancodes don't have any place in Unicode. Including arrow keys. So Mu carves out an exception to Unicode for arrow keys. We'll place the arrow keys in a part of Unicode that is set aside for implementation-defined behavior (https://en.wikipedia.org/wiki/C0_and_C1_control_codes#C1_controls): 0x80: left arrow 0x81: down arrow 0x82: up arrow 0x83: right arrow The order is same as hjkl for mnemonic convenience. I'd _really_ to follow someone else's cannibalization here. If I find one later, I'll switch to it. Applications that blindly assume the keyboard generates Unicode will have a bad time. Events like backspace, delete and arrow keys are intended to be processed early and should not be in text. With a little luck I won't need to modify this convention when I support international keyboards.
* clean up magic constantsKartik K. Agaram2021-03-151-9/+8
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* 7842 - new directory organizationKartik K. Agaram2021-03-031-0/+48
Baremetal is now the default build target and therefore has its sources at the top-level. Baremetal programs build using the phase-2 Mu toolchain that requires a Linux kernel. This phase-2 codebase which used to be at the top-level is now under the linux/ directory. Finally, the phase-2 toolchain, while self-hosting, has a way to bootstrap from a C implementation, which is now stored in linux/bootstrap. The bootstrap C implementation uses some literate programming tools that are now in linux/bootstrap/tools. So the whole thing has gotten inverted. Each directory should build one artifact and include the main sources (along with standard library). Tools used for building it are relegated to sub-directories, even though those tools are often useful in their own right, and have had lots of interesting programs written using them. A couple of things have gotten dropped in this process: - I had old ways to run on just a Linux kernel, or with a Soso kernel. No more. - I had some old tooling for running a single test at the cursor. I haven't used that lately. Maybe I'll bring it back one day. The reorg isn't done yet. Still to do: - redo documentation everywhere. All the README files, all other markdown, particularly vocabulary.md. - clean up how-to-run comments at the start of programs everywhere - rethink what to do with the html/ directory. Do we even want to keep supporting it? In spite of these shortcomings, all the scripts at the top-level, linux/ and linux/bootstrap are working. The names of the scripts also feel reasonable. This is a good milestone to take stock at.