libsa: Remove redundant sys/cdefs.h

Sponsored by: Netflix

stand: Add 1440p to the list of known resolutions.

MFC after: 1 week
Reviewed by: manu, kevans, imp
Differential Revision: https://reviews.freebsd.org/D43391

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

stand: Fix a common typo in source code comments

- s/existance/existence/

MFC after: 3 days

loader: framebuffer should only be written into

Reading from Write Combining memory can be very-very slow. Try to use
shadow buffer to avoid such reads.

MFC after: 1 month
Differential Revision: ht

loader: framebuffer should only be written into

Reading from Write Combining memory can be very-very slow. Try to use
shadow buffer to avoid such reads.

MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D33305

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loader: use display pixel density for font autoselection

Calculate font size from 16 density independent pixels (dp) by using:
size = 16 * ppi/160 * display_factor

We are specifying font size 16dp,

loader: use display pixel density for font autoselection

Calculate font size from 16 density independent pixels (dp) by using:
size = 16 * ppi/160 * display_factor

We are specifying font size 16dp, and assuming 1dp = 160ppi.
Also apply scaling factor 2 (display_factor).

MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D28849

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loader: handle malloc failures in vbe_init, use consistent naming

Handle malloc failures in vbe_init().

If it should so happen and we do get malloc failure in vbe_init(),
use original mode list.

R

loader: handle malloc failures in vbe_init, use consistent naming

Handle malloc failures in vbe_init().

If it should so happen and we do get malloc failure in vbe_init(),
use original mode list.

Replace nitems with nentries to have naming consistency and avoid
confusion with nitems() macro.

Reported by: yuripv, rpokala

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loader: create local copy of mode list provided by vbeinfoblock

Apparently some systems do corrupt mode list memory area, so we need
to use local copy instead.

loader: instead of hw.vga.textmode, use screen.textmode

hw.vga.textmode is directing VT VGA backend to use text mode.

The default screen mode for BIOS loader is text, and default
screen mode for VT

loader: instead of hw.vga.textmode, use screen.textmode

hw.vga.textmode is directing VT VGA backend to use text mode.

The default screen mode for BIOS loader is text, and default
screen mode for VT VGA backend is graphics (unless we are running on
hypervisor or hw.vga.textmode is set to 1). Using hw.vga.textmode
for loader does remove possibility to have graphical mode VT VGA with
text mode loader.

screen.textmode can have possible values "0" to disable text mode,
and "1" to set text mode.

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loader: only use vidc_install_font() with vga controller

If the controller does not support VGA, we should not
touch VGA registers.

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

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

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