[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[utest][handles] don't treat handles as signed

So we will still compile when they become unsigned.

Change-Id: Ifc5d98aec0bbd26cb9fabcbdd6be00cd520e0343

[magenta] cleanup deprected thread/process signal

MX_PROCESS_SIGNALED and MX_THREAD_SIGNALED have
been slated to be removed for a while now.

Can't remove them from the header because fuchsia
uses them. Only in like 4 places.

Change-Id: I068e1556d8bdc8cb5b57a6f9b011eb6e924a5836

[utest] Remove arm32 code from thread-initial-state test.

Change-Id: Ib12c69ef611457d846d994dbf6f0692191f001e9

[musl][magenta] Move process handle header into magenta

Change-Id: I00eb8f5ca7fbaf9297f3b1e5b391be00ce5d11e2

[syscalls] update callers to mx_handle_wait_*() and deprecate

Change-Id: I7b0516007b99d58aee906eac62358625100ee32e

[signals] Remove legacy signal names

Change-Id: I6d4543358a16d16b9b9028ede06af40a632ba31b

[syscalls] mx_thread_create() updated

Change-Id: I843d3a4a15f0f49bb91adc4ebd93ab8983916cb7

[syscalls][process] drop the magic 0 handle for syscalls that take process handle

This is largely just replacing all cases with mx_process_self()

Change-Id: I5fbe00f814c84537400c6a2eec18e747386ec7db

[kernel] Take second user argument in thread_start system call

Let mx_thread_start specify a second argument register value,
just as mx_process_start can.

Change-Id: I2a995f2a502bf85744ae9def1cda838172350ce3

[system] Move system/* includes to magenta/* under global.

Change-Id: I9b8673a16162da3bd1328a2eae3fbd855f1a7730

[kernel][magenta] switch thread/process creation syscalls to a two phase api

-In both thread and process creation apis, require user space create the
object first, then start it with additional args
-For threads stack allocation is also moved to user space
-Wire up the process/thread handles to be transferred through to new processes

Change-Id: I43d447c86af1ab3199d8dcf29ff4fe3a384b6e65

[system] align license and license banners with Fuchsia

This adjusts the Magenta userspace code to match the prevailing
license in Fuchsia (three-clause BSD), using the same banner
and license text.

Change-Id: I6b6d79435c5dbaa32027888874849e4f47aaa7be

[magenta][syscalls] Refactor wait-one/wait-many to use a WaitEvent object.

Also make wait-one/wait-many provide the satisfied/satisfiable signals
in a struct (mx_signals_state_t), and add a result_index output argument
to wait-many.

Currently, the WaitEvent object still uses an event_t, but that can be
changed later.

The WaitEvent can pass a context, which is used to transmit the
result_index for wait-many (i.e., the index of the first handle to
cause the wait to be satisfied).

Some of the abstraction (like WaitEvent::Result) is to support future
work on wait sets, etc. (The context also is a uint64_t, to support work
on wait sets.)

Change-Id: I54c517b8627d225da72a23ff5a72be9b3a92065b

[system][utest]/[mxsh] Make runtests output less by default

To output the full amount use "runtests -v".

This introduces a verbosity_level concept for system/ulib/unnittest
with unittest_set_verbosity_level(level) to control it.

Change-Id: I0f301adf4fdac9a3cf6c76e41d4b9587c9495d1f

[syscalls][api] rename _magenta_*() to mx_*()

The _magenta_ prefix is pretty unwieldy.
This change simplifies that a bit.

This was done mechanically, and boots, runs, and passes tests
on qemu arm64, amd64, and NUC.

Change-Id: I8eb07db6ed6f4b8cac96344cc4ad65ce3f85f917

[ulib][unittest] Move unittest into its own library

Change-Id: I1586278e3bbb6ceacd26a1342985922dc8861cf7

[build][userspace] Support .init_array for userspace with gcc

In particular, with this change, C++ constructors are running now, and
static C variables are initialized.

Change-Id: If0252773faae705af78902f782aaa200d0c5f85e

[utest] Port thread initial state test to use test framework

Change-Id: I2f8a255f1a05dd38930c9a6be94c2d38a3dc74e5

[system] clang-format all of userspace

Change-Id: I6bb6a9187a4af83ca5c0656f05d89aa3a09fa5fa

[magenta] Initial commit