NAME¶
vga_getgraphmem - returns the address of the VGA memory
SYNOPSIS¶
#include <vga.h>
unsigned char *graph_mem; /* This declaration is already in vga.h */
unsigned char *vga_getgraphmem(void);
DESCRIPTION¶
returns a pointer to the 64K VGA frame buffer window.
vga_setpage(3),
vga_setreadpage(3) and
vga_setwritepage(3) allow to select which
page of the VGA memory shows up at this position.
vga_setlinearaddressing(3) maps all VGA memory at a consecutive memory
area (if the hardware supports it). In this mode,
vga_getgraphmem()
will return the location of this area too. You can also access the global
variable
graph_mem, which will also contain this address.
Most demos, esp.
vgatest(6) show the simple direct use of this function
to access screen memory.
SEE ALSO¶
svgalib(7),
vgatest(6),
fun(6),
testlinear(6),
vga_setlinearaddressing(3),
vga_claimvideomemory(3),
vga_getmodeinfo(3),
vga_setpage(3),
vga_setreadpage(3),
vga_setwritepage(3),
AUTHOR¶
This manual page was edited by Michael Weller
<eowmob@exp-math.uni-essen.de>. The exact source of the referenced
function as well as of the original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm
Hanemaayer <H.Hanemaayer@inter.nl.net>.
Occasionally this might be wrong. I hereby asked to be excused by the original
author and will happily accept any additions or corrections to this first
version of the svgalib manual.
