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

1 files changed, 4 insertions, 0 deletions

diff --git a/stand/forth/brand.4th b/stand/forth/brand.4th
index 39a9bfae753c..034e4eb40445 100644
--- a/stand/forth/brand.4th
+++ b/stand/forth/brand.4th
@@ -72,3 +72,7 @@ variable brandY
 		else drop then
 	then
 ;
+
+: draw-brand
+	['] draw-brand console-iterate
+;