7842 - new directory organization

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.

1 files changed, 8 insertions, 8 deletions

diff --git a/309stream.subx b/309stream.subx
index adc92cfd..56b19272 100644
--- a/309stream.subx
+++ b/309stream.subx
@@ -98,10 +98,10 @@ $write-to-stream:end:
     c3/return
 
 $write-to-stream:abort:
-    (write-buffered Stderr "write-to-stream: stream full\n")
-    (flush Stderr)
-    bb/copy-to-ebx 1/imm32
-    (syscall_exit)
+    (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "write-to-stream: stream full" 3 0)  # 3=cyan
+    {
+      eb/jump loop/disp8
+    }
     # never gets here
 
 read-from-stream:  # s: (addr stream _), out: (addr byte), n: int
@@ -151,10 +151,10 @@ $read-from-stream:end:
     c3/return
 
 $read-from-stream:abort:
-    (write-buffered Stderr "read-from-stream: stream empty\n")
-    (flush Stderr)
-    bb/copy-to-ebx 1/imm32
-    (syscall_exit)
+    (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "read-from-stream: stream empty" 3 0)  # 3=cyan
+    {
+      eb/jump loop/disp8
+    }
     # never gets here
 
 stream-first:  # s: (addr stream byte) -> result/eax: byte