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|
\
\ Fcode payload for QEMU VGA graphics card
\
\ This is the Forth source for an Fcode payload to initialise
\ the QEMU VGA graphics card.
\
\ (C) Copyright 2013 Mark Cave-Ayland
\
fcode-version3
\
\ Dictionary lookups for words that don't have an FCode
\
: (find-xt) \ ( str len -- xt | -1 )
$find if
exit
else
-1
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
: openbios-video-width openbios-video-width-xt @ ;
: openbios-video-height openbios-video-height-xt @ ;
: depth-bits depth-bits-xt @ ;
: line-bytes line-bytes-xt @ ;
" fb8-fillrect" (find-xt) value fb8-fillrect-xt
: fb8-fillrect fb8-fillrect-xt execute ;
\
\ IO port words
\
" ioc!" (find-xt) value ioc!-xt
" iow!" (find-xt) value iow!-xt
: ioc! ioc!-xt execute ;
: iow! iow!-xt execute ;
\
\ VGA registers
\
h# 3c0 constant vga-addr
h# 3c8 constant dac-write-addr
h# 3c9 constant dac-data-addr
: vga-color! ( r g b index -- )
\ Set the VGA colour registers
dac-write-addr ioc! rot
2 >> dac-data-addr ioc! swap
2 >> dac-data-addr ioc!
2 >> dac-data-addr ioc!
;
\
\ VBE registers
\
h# 0 constant VBE_DISPI_INDEX_ID
h# 1 constant VBE_DISPI_INDEX_XRES
h# 2 constant VBE_DISPI_INDEX_YRES
h# 3 constant VBE_DISPI_INDEX_BPP
h# 4 constant VBE_DISPI_INDEX_ENABLE
h# 5 constant VBE_DISPI_INDEX_BANK
h# 6 constant VBE_DISPI_INDEX_VIRT_WIDTH
h# 7 constant VBE_DISPI_INDEX_VIRT_HEIGHT
h# 8 constant VBE_DISPI_INDEX_X_OFFSET
h# 9 constant VBE_DISPI_INDEX_Y_OFFSET
h# a constant VBE_DISPI_INDEX_NB
h# 0 constant VBE_DISPI_DISABLED
h# 1 constant VBE_DISPI_ENABLED
\
\ Bochs VBE register writes
\
: vbe-iow! ( val addr -- )
h# 1ce iow!
h# 1d0 iow!
;
\
\ Initialise Bochs VBE mode
\
: vbe-init ( -- )
h# 0 vga-addr ioc! \ Enable blanking
VBE_DISPI_DISABLED VBE_DISPI_INDEX_ENABLE vbe-iow!
h# 0 VBE_DISPI_INDEX_X_OFFSET vbe-iow!
h# 0 VBE_DISPI_INDEX_Y_OFFSET vbe-iow!
openbios-video-width VBE_DISPI_INDEX_XRES vbe-iow!
openbios-video-height VBE_DISPI_INDEX_YRES vbe-iow!
depth-bits VBE_DISPI_INDEX_BPP vbe-iow!
VBE_DISPI_ENABLED VBE_DISPI_INDEX_ENABLE vbe-iow!
h# 0 vga-addr ioc!
h# 20 vga-addr ioc! \ Disable blanking
;
\
\ PCI
\
" pci-bar>pci-region" (find-xt) value pci-bar>pci-region-xt
: pci-bar>pci-region pci-bar>pci-region-xt execute ;
h# 10 constant cfg-bar0 \ Framebuffer BAR
-1 value fb-addr
: map-fb ( -- )
cfg-bar0 pci-bar>pci-region \ ( pci-addr.lo pci-addr.hi size )
" pci-map-in" $call-parent
to fb-addr
;
\
\ Publically visible words
\
external
[IFDEF] CONFIG_MOL
defer mol-color!
\ Hook for MOL (see packages/molvideo.c)
\
\ Perhaps for neatness this there should be a separate molvga.fs
\ but let's leave it here for now.
: color! ( r g b index -- )
mol-color!
;
[ELSE]
\ Standard VGA
: color! ( r g b index -- )
vga-color!
;
[THEN]
: fill-rectangle ( color_ind x y width height -- )
fb8-fillrect
;
: dimensions ( -- width height )
openbios-video-width
openbios-video-height
;
: set-colors ( table start count -- )
0 do
over dup \ ( table start table table )
c@ swap 1+ \ ( table start r table-g )
dup c@ swap 1+ \ ( table start r g table-b )
c@ 3 pick \ ( table start r g b index )
color! \ ( table start )
1+
swap 3 + swap \ ( table+3 start+1 )
loop
;
headerless
\
\ Installation
\
: qemu-vga-driver-install ( -- )
fb-addr -1 = if
map-fb 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-vga-driver-init
vbe-init
openbios-video-width encode-int " width" property
openbios-video-height encode-int " height" property
depth-bits encode-int " depth" property
line-bytes encode-int " linebytes" property
['] qemu-vga-driver-install is-install
;
qemu-vga-driver-init
end0
|
