loader: Add loader.exit

Add loader.exit(status). While one can get alomst this behavior with
loader.perform("quit"), quit doesn't allow a value to be returned to the
firmware. The interpretation of 'status' is firmware specific. This can
be used when autobooting doesn't work in scripts, for example, to allow
the firmware to try something else...

Sponsored by: Netflix

Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D44094

loader: Create new gfx table

Create a new gfx global table. Put into it all the graphics bindings
that we have in loader today. For now, have compatability binding for
loader. Remove them from loader.

Sponsored by: Netflix
Reviewed by: kevans, jhb
Differential Revision: https://reviews.freebsd.org/D43902

loader: Separate gfx to a new file.

Move gfx lua hook registration to a new file.

Sponsored by: Netflix
Reviewed by: kevans, jhb
Differential Revision: https://reviews.freebsd.org/D43901

loader: Register the gfx stuff separately.

Move registration of the gfx stuff to separate function. However, no
change in functionality is intended.

Sponsored by: Netflix
Reviewed by: kevans, jhb
Differential Revision: https://reviews.freebsd.org/D43900

loader: Simplify the loader.has_command

luaL_checkstring already checks for the right number of
arguments. There's no need to do that by hand here. Now an exception
will be thrown like any other function with the wrong args. Also,
push a boolean instead of an int.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D43820

loader: export the CMD_ constants in loader table

Export the CMD_OK, etc constants in the loader table. They are the
return values of loader.perform, etc.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D43821

loader: provide a features table for binary compatibility advertisement

liblua now provides a loader.has_feature() function to probe the loader
binary for features advertised. name => desc mappings are provided in
loader.features to get a list of all of the features loader *can*
support. core.hasFeature is provided as a shim to loader.has_feature
so that individual consumers don't need to think about the logic of the
loader module not providing has_feature; we know that means the feature
isn't enabled.

The first consumer of this will be EARLY_ACPI to advertise that the
loader binary probes for ACPI presence before the interpreter has
started, so that we know whether we can trust the presence of acpi.rsdp
as relatively authoritative. In general, it's intended to be used to
avoid breaking new scripts on older loaders within reason.

This will be used in lua as `core.hasFeature("EARLY_ACPI")`, while the
C bits of loader will `feature_enable(FEATURE_EARLY_ACPI)`.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D42695

stand: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

loader: Change version calculation to be more consistent.

Use 1000 * major + minor when calculating the version number that
gets set in the Ficl environment or lua loader property. This allows
for more room if the minor number needs to go above 9.

Add loader.version property to lua loader.

Reviewed by: imp
Obtained from: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D39631

stand: Add lua binding loader.has_command

Give scripts the ability to determine if the currently running loader
has provided a command.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D36365

loader: implement framebuffer console

Draw console on efi.
Add vbe framebuffer for BIOS loader (vbe off, vbe on, vbe list,
vbe set xxx).
autoload font (/boot/fonts) based on resolution and font size.
Add command loadfont (set font by file) and
variable screen.font (set font by size). Pass loaded font to kernel.

Export variables:
screen.height
screen.width
screen.depth

Add gfx primitives to draw the screen and put png image on the screen.
Rework menu draw to iterate list of consoles to enamble device specific
output.

Probably something else I forgot...

Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D27420

liblua: add loader.lua_path

As described previously, loader.lua_path is absolute path where scripts are
installed. A future commit will use this to build paths for dofile in
try_include, rather than the current pcall/require setup that makes it more
difficult to coordinate loader aborts from local.lua -- we do not need the
flexibility of require(), and local.lua is in-fact not a 'module-like' file
as we will not be referencing anything from it.

lualoader: Improve module loading diagnostics

Some fixes:

- Maintain historical behavior more accurately w.r.t verbose_loading;
verbose_loading strictly prints "${module_name...}" and later "failed!"
or "ok" based on load success
- With or without verbose_loading, dump command_errbuf on load failure.
This usually happens prior to ok/failed if we're verbose_loading

Reviewed by: imp
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D17694

lualoader: Expose loader.parse and add cli_execute_unparsed

This will be used for scenarios where the command to execute is coming in
via the environment (from, for example, loader.conf(5)) and is thus not
necessarily trusted.

cli_execute_unparsed will immediately be used for handling
module_{before,after,error} as well as menu_timeout_command. We still want
to offer these variables the ability to execute Lua-intercepted loader
commands, but we don't want them to be able to execute arbitrary Lua.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D14580

liblua: Add loader.interpret

This allows lua to pass back a command string to be executed as if it were
typed at the loader prompt- loader tries to execute the string first as pure
lua, then parses it and gives lua a chance to intercept before it tries to
execute it itself.

This will be used to implement menu_timeout_command, among other things,
which *should* be used to execute basic loader commands independent of the
chosen interpreter.

liblua: Use putc instead of printf for printc

printc does not need the features or the overhead of printf. It does not
take formatting strings, and it pipes the single string argument through an
"%s" format.

Instead, use putc directly. This pipes the string through in its entirety as
a series of 'unsigned char's, generally straight to the console emulator.

Discussed with: tsoome

lualoader: Register loader.printc as global printc

liblua: Implement write support

Write support (even if it only works on UFS) will be needed for nextboot
functionality.

Reviewed by: cem, imp
Differential Revision: https://reviews.freebsd.org/D14478

liblua: Add loader.machine and loader.machine_arch properties

Provisioned from MACHINE/MACHINE_ARCH on the system, expose loader.machine
and loader.machine_arch respectively.

These may be used to hide ACPI option on non-applicable archs.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D14446

Implement loader.command

This is just like loader.perform, except it takes pre-parsed arguments.

Review: https://reviews.freebsd.org/D14448

liblua: Fix missing '}' in lutil.c after r329499

interp_lua: Register io/loader with regular Lua module system

Reviewed by: kevans
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D14421

liblua: Clean up io/loader C module registration

Utilize registration APIs Lua provides to make module definition a little
cleaner.

Discussed with: imp
Sponsored by: Dell EMC Isilon

Add Lua as a scripting langauge to /boot/loader

liblua glues the lua run time into the boot loader. It implements all
the runtime routines that lua expects. In addition, it has a few
standard 'C' headers that nueter various aspects of the LUA build that
are too specific to lua to be in libsa. Many refinements from the
original code to improve implementation and the number of included lua
libraries. Use int64_t for lua_Number. Have "/boot/lua" be the default
module path. Numerous cleanups from the original GSoC project,
including hacking libsa to allow lua to be built with only one change
outside luaconf.h.

Add the final bit of lua glue to bring in liblua and plug into the
multiple interpreter framework, previously committed.

Add LOADER_LUA option, currently off by default.

Presently, this is an experimental option. One must opt-in to using
this by defining WITH_LOADER_LUA and WITHOUT_FORTH. It's been
lightly tested, so keep a backup copy of your old loader handy.
The menu code, coming in the next commit, hasn't been exhaustively
tested. A LUA boot loader is 60k larger than a FORTH one, which is
80k larger than a no-interpreter one. Subtle changes in size
may tip things past some subtle limit (the binary is ~430k now
when built with LUA). A future version may offer coexistance.

Bump FreeBSD version to 1200058 to mark the milestone.

Pedro Souza's 2014 Summer of Code project. Rui Paulo, Pedro Arthur,
Zakary Nafziger and Wojciech A. Koszek also contributed. Warner Losh
reworked it extensively into its current form.

Obtained from: https://wiki.freebsd.org/SummerOfCode2014/LuaLoader
Sponsored by: Google Summer of Code
Relnotes: Yes
MFC After: 1 month
Differential Review: https://reviews.freebsd.org/D14295