[syscalls] Update parameter types and names

This CL updates the parameter types and names for a number of syscalls
to match the Zircon System API rubric. There's more work to do to make
all the syscalls conform to the rubric, but this change is a start.

Change-Id: I218ac5e7e0cbd80a8c69fef7891ad40b78b6b407

[hypervisor][ktrace] Add VCPU blocking events

Add ktrace events for when the VCPU is blocked while either waiting for
an interrupt or waiting for a port packet to become available.

This also restructures the way we record metadata for VCPU ktraces in
order to be more efficient.

PD-100 #comment

Change-Id: I43551a0068bb3d6393a9a58c21b3ea813edfb726

[ktrace] Use RAII mutex in ktrace

Change-Id: I18a962d2cd5489cc760710be535627d865435201

[kernel][ktrace][arm] use the raw tick counter for ktrace on arm

-Add current_ticks() call which uses the appropriate architectural
counter.
-Switch ktrace to using that.

ZX-1387 #comment

Change-Id: I10f1f50c7b464abb241bf719026fbdca046b1226

[kernel][ktrace] Revamp static registration, add "ktrace_ready" probe

Change the static registration scheme so that the "orphan" section
created is read-only. Writable "orphan" sections do not come out
right with LLD and we must avoid them.

Report an event for "tracing is all set up now". This also serves
to ensure that there will be at least one static probe entry so that
registration is actually tested. Since __{start,stop}_ktrace_probe
symbols will always be defined by the linker, we don't need to use
weak symbols, which force the compiler to use a GOT slot under PIC.

Along the way this makes the ktrace_probeN macros C++-compatible
and ;-eating.

Change-Id: I30c5aac0af1c5822e4aff3fedaac5dd961b97dfd

[kernel] Remove kernel/app module

This is no longer used at all.
The kernel/app/tests code doesn't use the "app" infrastructure.
So move it to kernel/tests.

Change-Id: I6cd8ec1bf569fd95940e5ebf4dc5f640b265eb69

[ktrace] Use ZX_MAX_NAME_LEN in ktrace_name_etc().

Use (ZX_MAX_NAME_LEN - 1) instead of hard coded 31.

Change-Id: I844c4da84a18d1112eb4bd674b72810d12ac4ac7

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[kernel][vm] move kernel/kernel/vm to just kernel/vm

Change-Id: I8f724a9f8a61415712661d1fdd3dc4e1c70cf620

[lib/magenta] Rename kernel/lib/magenta to kernel/object

TODO: Rename magenta.{cpp,h} and other instances of "magenta" in this
module.

For MG-1091 "Rename kernel/lib/magenta"

Change-Id: I2abc316f543798e00d3a4d1c2c83195da26e6836

[kernel][status] Convert the rest of kernel/lib to mx_status_t

Change-Id: Iba1bb7024bcefa7c5e3ee58b02d0be758c6545ae

[magenta][userthread] Collapse user_thread.h and thread_dispatcher.h

Change-Id: I76cab0bdffbc4d1411f9aea71a68217f85dccc98

[kernel][ktrace] push all of the process names into the ktrace buffer when restarting

Change-Id: Ib310618aa964e1a9bbc0e719b029455b4dd6562e

[kernel][lib] Use the new MX_OK and MX_ERR_* names

Change-Id: I436bb0728838729bef6e20a6db0e8ce6a96b5534

[kernel][vm] restructure kernel vm headers and remove more legacy routines

Mostly unpack vm.h into a few separate headers.

No functional change

Change-Id: Ifd85506f49596d82a3a0e970fc911a34f3064d70

[kernel][ktrace] move the timestamp getting to the point where its stored

shouldn't affect timestamping much and speeds up cases where it's masked
out.

Change-Id: I81845f1207825800e143b037868674d4dde0539f

[kernel][timer] Remove get_tsc_ticks_per_ms.

We already have ticks_per_second, which is used everywhere else.

Change-Id: I88c3ed210b80597db755f68257700c1bbaaf7d74

[kernel][vm] Remove defunct min_alloc_gap arguments

Change-Id: I931dd3a70fff34ca2acd157f8fcedd71ba9e44a3

[kernel][pc] Finish C++ conversion

Change-Id: Iea6ff5e497597c1b0cd3a914e1a3cdd5b641cf58

[kernel][time] Rename lk_bigtime_t and current_time_hires()

Now that millisecond time is gone from the kernel, reclaim the names
used for it.

lk_bigtime_t -> lk_time_t
current_time_hires() -> current_time()

Change-Id: I7db5de01171096c04a2b12d293e047e6a08a0aef

[sysgen][kernel] Make sysgen totes a build time thing.

This patch does the following things:
- removes all commited sysgen generated code.
- generates all sysgen code into gen/include
other directory opinions welcome.
- changes sysgen to generate a single file of a single type
(it was easier to work with this way - I may delete the other version).
- changes various makefiles and sources to work with new include paths.
- changes all the filenames to things that are slightly better than gen-*
other filename opinions welcome.

Please commence filename, output-path and make-fu bike-shedding... now!

Change-Id: I822bb685820a05a1467b12097175c92881c4bd4a

[magenta][locks] Annotate some mutexes

Change-Id: I8ff6ad8d3e6dbe424e8e7cfdb06943b5838ae8b4

[kernel][style] Use nullptr rather than NULL in kernel C++ code

Change-Id: I7feea6a42c00531be28a98c820b2c234484bfe3b

[syscalls] switch to generated code

...from the macro and syscall.inc universe

Most of the turbulence is changing the badgercast back
to T* and the adding user_ptr<T> in each spot which
looks less pretty but it is correct by construction
and a temporary state anyhow.

In the final state the syscalls would look and speak
pretty again, but that needs more codegen.

Along with this we also change pointer/buffers from
user mode to have underscore prefix, so we are consistent
there.

Change-Id: I8342210f667f5056ac56a5bab168cb8776ab35ce

[kernel][vdso] Implement mx_num_cpus in vDSO without a syscall

Remove the mx_num_cpus syscall and replace it with a pure
user-space implementation in the vDSO. The kernel writes
the value into the vDSO's rodata in the VMO, so the vDSO
code can simply read it.

Change-Id: I1a86d877bbb49f2d8e68a16455f31a10d04c86d0

[ktrace] fix memory corruption due to long probe names

Change-Id: Ia2b22c7b35402ef1049dde9e17b4191605146552

[ktrace] add userspace trace probe support

- /dev/class/misc/ktrace gains two ioctls:
- IOCTL_KTRACE_GET_HANDLE
- IOCTL_KTRACE_ADD_PROBE
- mx_ktrace_write() syscall allows injecting probes from userspace
- ktrace supports runtime probe registration

Change-Id: I6cf34da5cb044c1432f926466e29d5a2005c4851

[vmm] Add support for requesting gaps between allocations

The gaps are guaranteed at the time of invocation, though may
be filled by subsequent allocations that have smaller gap requirements.
A future revision could make the gaps hard requirements.

Change-Id: I3be705d8e07c1c2b4bdd9f70bce57f9640c73ff2

[kernel] add -Wmissing-prototypes, fix all the warnings that show up

Mostly just a bunch of functions that needed to be made static, though
fix a few places where a prototype needs to be moved into a header
to be shared across a few files.

Change-Id: Ic7510490257c5c9ef1c702317db4121c45daae35

[kernel][time] move current_time_hires() to nanoseconds

Find all the cases where it's used (mostly for benchmarking) and
make sure it's in nanoseconds.

Switch the PC time calculations to use the fixed point multiplication
routines.

Change-Id: I06ef9d705dbef3f23e20bf25b7a8c7c8f37a72b4

[ktrace] ktrace_probe0(name), ktrace_probe2(name,a,b) for quick probing

These macros allow 0 or 2 argument named tracepoints to be created.
They are assigned an event number in the 0x800..0xFFF range and a
mapping from event number to name is added to the trace metadata.

Change-Id: I0385f1b06a1cc45114d3b2cf3915a23e0cb640ee

[ktrace] trace syscall enter/exit, irq enter, some cleanup

Change-Id: Iad65dcba3fb6c9cea6a35ad05536c51bca15d230

[ktrace][ktracedump] report existing threads when trace starts

Change-Id: Ia6c05389a51675d5aabaaaa46dc8421125398e70

[ktrace][ktracedump] move to variable sized ktrace records

The low 4 bits of the record now indicate the size of the entire
record, in units of sizeof(uint64_t)

ktrace_open(tag) now provides a common path to acquire a record
to write a payload into, with the timestamp, thread id, and tag
pre-loaded. It returns NULL if tracing is disabled, the event
group is masked, or the trace buffer is full.

re-implemented ktrace_name() against ktrace_open() and ktrace()
as an inline function against ktrace_open()

Update ktracedump to handle the changes to the wire format.

Change-Id: Ifc1d58beb7ca8fc017b9a6b4d0edb97cdb908cf6

[ktrace] core kernel event tracing facility

This adds the ktrace() tracepoint system, which compiles
out to nothing when WITH_LIB_KTRACE is not included.

Trace packets are accumulated in a buffer and an API is
provided to drain the buffer, start/stop tracing, adjust
trace event group masks to determine which events to
capture, etc.

The default buffer size is 32MB. It is adjustable with
the commandline option ktrace.bufsize (value in MB).

The default group mask for tracing from boot is all groups.
It is adjustable with ktrace.grpmask.

Change-Id: I491e4303f858021f9bf9600ba22ecb2c763d0e22