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Basically this should never, ever happen until I start reclaiming heap
memory. I believe the only reason it happens is unprotected writes to address
0 or thereabouts.
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It's also no longer contiguous with code.
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It requires more than 1GB to fill the screen with a chessboard pattern
using the definition in shell/iterative-definitions.limg.
I also speed up the chessboard program by clearing the screen up front
and then only rendering the white pixels.
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There are several things in the codebase right now that don't seem sustainable.
I need to take them out and bring them back in more gradually.
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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.
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We still need a few primitives, but we can implement these as needed. I'm
ready to call the fake screen done.
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Tighten up some function signatures.
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