syscons: add deprecation notice

syscons(4) is not compatible with UEFI, does not support UTF-8, and is
Giant-locked. There is no specific timeline yet for removing it, but
support for the Giant loc

syscons: add deprecation notice

syscons(4) is not compatible with UEFI, does not support UTF-8, and is
Giant-locked. There is no specific timeline yet for removing it, but
support for the Giant lock is expected to go away in one or two major
release cycles. Add a deprecation notice to avoid surprises, and help
ensure that any material deficiencies in vt(4) become known.

Reviewed by: manu, markj, imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D47396

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syscons: refer to it as the legacy console

vt(4) is the default console, and although there is no firm deprecation
plan for syscons(4) yet it it is not actively maintained and is not
compatible with

syscons: refer to it as the legacy console

vt(4) is the default console, and although there is no firm deprecation
plan for syscons(4) yet it it is not actively maintained and is not
compatible with contemporary systems (i.e., those booting via UEFI).

Reviewed by: manu
MFC after: 3 days
Sponsored by: The FreeBSD Foundation

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

syscons: note incompatibility with UEFI

PR: 264226
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

Fix a few mandoc issues

- skipping paragraph macro: Pp after Sh
- sections out of conventional order: Sh EXAMPLES
- whitespace at end of input line
- normalizing date format

MFhead@r344527

Merge ^/head r344178 through r344512.

Connect the restored dumb and sc terminal emulators to the kernel build.
Add or fix options to control static and dynamic configuration. Keep
the default of scteken, but default to statically config

Connect the restored dumb and sc terminal emulators to the kernel build.
Add or fix options to control static and dynamic configuration. Keep
the default of scteken, but default to statically configuring all available
emulators (now 3 instead of 1).

The dumb emulator is almost usable. libedit and libreadline handle
dumb terminals perfectly for at least shell history. less(1) works
as well as possible except on exit. But curses programs make messes.
The dumb emulator has strange color support, with 2 dumb colors for
normal output but fancy colorization for the cursor, mouse pointer and
(with a non-dumb initial emulator) for low-level console output.

Using the sc emulator instead of the default of scteken fixes at least
the following bugs:
- NUL is a printing character in cons25 but not in teken
- teken doesn't support fixed colors for "reverse" video.
- The best versions of sc are about 10 times faster than scteken (for
printing to the frame buffer). This version is only about 5 times
faster.

Fix configuration features:
- make SC_DFLT_TERM (for setting the initial emulator) a normal option.

Add configuration features:
- negative options SC_NO_TERM_* for omitting emulators in the static config.
Modules for emulators might work, but I don't know of any
- vidcontrol -e shows the available emulators
- vidcontrol -E <emulator> sets the active emulator.

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Improve defaults for per-CPU kernel console colors, especially with 2
or 4 CPUs. Add a compile-time option SC_KERNEL_CONS_ATTRS to control the
defaults.

Default to color numbers in reverse order to

Improve defaults for per-CPU kernel console colors, especially with 2
or 4 CPUs. Add a compile-time option SC_KERNEL_CONS_ATTRS to control the
defaults.

Default to color numbers in reverse order to CPU numbers (instead of
in the same order with white first and wrapping to dark grey), so that
the brightest bright colors are used first. Don't use dark grey at all;
replace it by dark green.

Syscons has too many compile-time options, but this one is needed in
in case the defaults give something like white on white, or the user
really hates this feature and can't wait to turn it off in rc.

MFC after: next release?

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Merge ^/head r303250 through r304235.

syscons,vt: improve phrasing in kern.vty man page description

Submitted by: wblock

syscons.4,vt.4: update kern.vty description reflecting vt as default

rS274085 made vt(4) the default system console. Catch up to this in
the man page description for the kern.vty tunable.

Reviewed

syscons.4,vt.4: update kern.vty description reflecting vt as default

rS274085 made vt(4) the default system console. Catch up to this in
the man page description for the kern.vty tunable.

Reviewed by: bz
Approved by: re (hrs)
Differential Revision: https://reviews.freebsd.org/D6901

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IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

Describe kern.vty sc/vt tunable in syscons(4)

Reviewed by: wblock

Clarify the setting of syscons driver flags

Submitted by: wblock

Add a vt(4) cross reference to syscons(4)

use .Mt to mark up email addresses consistently (final part)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

Merge from head

IFC @ r254014

IFC @253398

Merge fresh head.

Add missing Pp. Also remove some minor whitespace.

PR: 177995
Submitted by: olgeni

MFC