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|
\
\ Fcode payload for QEMU CG3 graphics card
\
\ This is the Forth source for an Fcode payload to initialise
\ the QEMU CG3 graphics card.
\
\ (C) Copyright 2013 Mark Cave-Ayland
\
fcode-version3
\
\ Instead of using fixed values for the framebuffer address and the width
\ and height, grab the ones passed in by QEMU/generated by OpenBIOS
\
: (find-xt) \ ( str len -- xt | -1 )
$find if
exit
else
2drop
-1
then
;
: (is-openbios) \ ( -- true | false )
" openbios-video-width" (find-xt) -1 <> if
-1
else
0
then
;
" openbios-video-width" (find-xt) cell+ value openbios-video-width-xt
" openbios-video-height" (find-xt) cell+ value openbios-video-height-xt
" depth-bits" (find-xt) cell+ value depth-bits-xt
" line-bytes" (find-xt) cell+ value line-bytes-xt
" debug-type" (find-xt) value debug-type-xt
: openbios-video-width
(is-openbios) if
openbios-video-width-xt @
else
h# 400
then
;
: openbios-video-height
(is-openbios) if
openbios-video-height-xt @
else
h# 300
then
;
: depth-bits
(is-openbios) if
depth-bits-xt @
else
h# 8
then
;
: line-bytes
(is-openbios) if
line-bytes-xt @
else
h# 400
then
;
: debug-type debug-type-xt execute ;
\
\ Registers
\
h# 400000 constant cg3-off-dac
h# 20 constant /cg3-off-dac
h# 800000 constant cg3-off-fb
h# c0000 constant /cg3-off-fb
: >cg3-reg-spec ( offset size -- encoded-reg )
>r 0 my-address d+ my-space encode-phys r> encode-int encode+
;
: cg3-reg
\ A real cg3 rom appears to just map the entire region with a
\ single entry
h# 0 h# 1000000 >cg3-reg-spec
" reg" property
;
: do-map-in ( offset size -- virt )
>r my-space r> " map-in" $call-parent
;
: do-map-out ( virt size )
" map-out" $call-parent
;
\
\ DAC
\
-1 value cg3-dac
-1 value fb-addr
: dac! ( data reg# -- )
cg3-dac + c!
;
external
: color! ( r g b c# -- )
0 dac! ( r g b )
swap rot ( b g r )
4 dac! ( b g )
4 dac! ( b )
4 dac! ( )
;
headerless
\
\ Mapping
\
: dac-map
cg3-off-dac /cg3-off-dac do-map-in to cg3-dac
;
: fb-map
cg3-off-fb h# c0000 do-map-in to fb-addr
;
: map-regs
dac-map fb-map
;
\
\ Installation
\
" cgthree" device-name
" display" device-type
" SUNW,501-1415" model
: qemu-cg3-driver-install ( -- )
cg3-dac -1 = if
map-regs
\ Initial pallette taken from Sun's "Writing FCode Programs"
h# ff h# ff h# ff h# 0 color! \ Background white
h# 0 h# 0 h# 0 h# ff color! \ Foreground black
h# 64 h# 41 h# b4 h# 1 color! \ SUN-blue logo
fb-addr to frame-buffer-adr
default-font set-font
frame-buffer-adr encode-int " address" property
openbios-video-width openbios-video-height over char-width / over char-height /
fb8-install
then
;
: qemu-cg3-driver-init
cg3-reg
openbios-video-height encode-int " height" property
openbios-video-width encode-int " width" property
line-bytes encode-int " linebytes" property
h# 39 encode-int 0 encode-int encode+ " intr" property
\ Monitor sense. Some searching suggests that this is
\ 5 for 1024x768 and 7 for 1152x900
openbios-video-width h# 480 = if
h# 7
else
h# 5
then
encode-int " monitor-sense" property
" SUNW" encode-string " manufacturer" property
" ISO8859-1" encode-string " character-set" property
h# c encode-int " cursorshift" property
['] qemu-cg3-driver-install is-install
;
qemu-cg3-driver-init
end0
|
