01-30-2011
need help changing the vga mode
hello all,
I am trying to interface the VGA, however, it appears to be in text mode. I want to get it into mode 13h (320x240) but I can't seem to achieve this I looked at
here to see which registers I need to set but I've for some reason I cant get it to work. Are these all the registers I need to set and are the values correct?
Last edited by neur0n; 02-03-2011 at 07:20 PM..
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VGA(3) Library Functions Manual VGA(3)
NAME
vga - VGA controller device
SYNOPSIS
bind #v /dev
/dev/vgactl
/dev/vgaiob
/dev/vgaiow
/dev/vgaiol
DESCRIPTION
The VGA device allows configuration of a graphics controller on a PC. Vgactl allows control over higher-level settings such as display
height, width, depth, controller and hardware-cursor type. Vgaiob, vgaiow and vgaiol allow control over individual 8-bit, 16-bit and
32-bit x86 I/O-ports respectively, such as those used to implement configuration and setup registers on a VGA controller card. These func-
tions are normally carried out by vga(8).
Writes to vgactl are of the form `attribute value'. Valid attributes are
size value is 'XxYxZ' , where X, Y and Z are numbers that tell the kernel the width and height of the screen in pixels and the number of
bits per pixel.
type tells the kernel which type of controller is being used, mainly to enable the correct code for display-memory bank switching at res-
olutions greater than 640x480x1. The names vga, clgd542x, et4000, mach32, and s3 are supported for value.
Note that this list does not indicate the full set of VGA chips supported. For example, s3 includes the 86C801/5, 86C928, Vision864,
and Vision964. It is the job of vga(8) to recognize which particular chip is being used and to initialize it appropriately.
hwgc tells the kernel to use a particular type of hardware graphics cursor. Bt485hwgc, et4000hwgc, s3hwgc and tvp3020hwgc, are currently
recognized values. A value of off reverts to using the software cursor.
Reading vgactl returns the current settings, one per line.
EXAMPLES
The following reverts to using the software graphics cursor
echo -n 'hwgc off' >/dev/vgactl
Sample code to read an x86 8-bit I/O port
uchar
inportb(long port)
{
uchar data;
if(iobfd == -1)
iobfd = open("#v/vgaiob", ORDWR);
seek(iobfd, port, 0);
if(read(iobfd, &data, sizeof(data)) != sizeof(data))
error("inportb(0x%4.4x): %r0, port);
return data;
}
SOURCE
/sys/src/9/pc/devvga.c
SEE ALSO
vga(8)
BUGS
There should be some restriction on the range of valid ports.
There should be support for the hardware graphics cursor on the clgd54[23]x VGA controller chips.
The hardware graphics cursor on the et4000 does not work in 2x8-bit mode.
VGA(3)