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, 40 deletions

diff --git a/init.soso b/init.soso
deleted file mode 100644
index 8753b412..00000000
--- a/init.soso
+++ /dev/null
@@ -1,40 +0,0 @@
-# Some OS-specific preliminaries for Soso.
-
-# Memory layout
-#
-# 0x40000000 - 0x40001ffff - for ELF code+data
-# 0x40002000 - 0x401ffffff - for heap
-== code 0x40000000
-== data 0x40001000
-
-# Syscalls
-#
-# We don't have libc, so we need to know Soso's precise syscall layout.
-# https://github.com/ozkl/soso/blob/master/kernel/syscalltable.h
-== code
-
-syscall_exit:  # status/ebx : int
-    b8/copy-to-eax 8/imm32
-    cd/syscall 0x80/imm8
-
-syscall_read:  # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
-    b8/copy-to-eax 2/imm32
-    cd/syscall 0x80/imm8
-    c3/return
-
-syscall_write:  # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
-    b8/copy-to-eax 3/imm32
-    cd/syscall 0x80/imm8
-    c3/return
-
-syscall_open:  # filename/ebx : (addr kernel-string), flags/ecx : int -> fd-or-error/eax : int
-    b8/copy-to-eax 0/imm32
-    cd/syscall 0x80/imm8
-    c3/return
-
-syscall_close:  # fd/ebx : int -> status/eax
-    b8/copy-to-eax 1/imm32
-    cd/syscall 0x80/imm8
-    c3/return
-
-# anonymous mmap not implemented