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, 0 insertions, 38 deletions

diff --git a/021div.cc b/021div.cc
deleted file mode 100644
index 15ed89d8..00000000
--- a/021div.cc
+++ /dev/null
@@ -1,38 +0,0 @@
-//: helper for division operations: sign-extend EAX into EDX
-
-:(before "End Initialize Op Names")
-put_new(Name, "99", "sign-extend EAX into EDX (cdq)");
-
-:(code)
-void test_cdq() {
-  Reg[EAX].i = 10;
-  run(
-      "== code 0x1\n"
-      "99\n"
-  );
-  CHECK_TRACE_CONTENTS(
-      "run: sign-extend EAX into EDX\n"
-      "run: EDX is now 0x00000000\n"
-  );
-}
-
-:(before "End Single-Byte Opcodes")
-case 0x99: {  // sign-extend EAX into EDX
-  trace(Callstack_depth+1, "run") << "sign-extend EAX into EDX" << end();
-  Reg[EDX].i = (Reg[EAX].i < 0) ? -1 : 0;
-  trace(Callstack_depth+1, "run") << "EDX is now 0x" << HEXWORD << Reg[EDX].u << end();
-  break;
-}
-
-:(code)
-void test_cdq_negative() {
-  Reg[EAX].i = -10;
-  run(
-      "== code 0x1\n"
-      "99\n"
-  );
-  CHECK_TRACE_CONTENTS(
-      "run: sign-extend EAX into EDX\n"
-      "run: EDX is now 0xffffffff\n"
-  );
-}