vga_getgraphmem

Section: Svgalib User Manual (3)
Updated: 27 July 1997
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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.

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.