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, 43 deletions

diff --git a/402time.mu b/402time.mu
deleted file mode 100644
index fdb98c81..00000000
--- a/402time.mu
+++ /dev/null
@@ -1,43 +0,0 @@
-type timespec {
-  tv_sec: int
-  tv_nsec: int
-}
-
-# return time in seconds since epoch
-# TODO: y2038
-fn time -> _/eax: int {
-  var t: timespec
-  var clock/ebx: int <- copy 0/CLOCK_MONOTONIC
-  var t-addr/ecx: (addr timespec) <- address t
-  syscall_clock_gettime
-  var t-secs-addr/ecx: (addr int) <- get t-addr, tv_sec
-  var secs/eax: int <- copy *t-secs-addr
-  return secs
-}
-
-# return time in nanoseconds since epoch
-fn ntime -> _/eax: int {
-  var t: timespec
-  var clock/ebx: int <- copy 0/CLOCK_MONOTONIC
-  var t-addr/ecx: (addr timespec) <- address t
-  syscall_clock_gettime
-  var t-nsecs-addr/ecx: (addr int) <- get t-addr, tv_nsec
-  var nsecs/eax: int <- copy *t-nsecs-addr
-  return nsecs
-}
-
-# nsecs must be less than 999999999 or 0x3b9ac9ff nanoseconds
-fn sleep secs: int, nsecs: int {
-  var t: timespec
-  # initialize t
-  var tmp/eax: (addr int) <- get t, tv_sec
-  var tmp2/ecx: int <- copy secs
-  copy-to *tmp, tmp2
-  tmp <- get t, tv_nsec
-  tmp2 <- copy nsecs
-  copy-to *tmp, tmp2
-  # perform the syscall
-  var t-addr/ebx: (addr timespec) <- address t
-  var rem-addr/ecx: (addr timespec) <- copy 0
-  syscall_nanosleep
-}