vga_getgraphmem - returns the address of the VGA memory
unsigned char *graph_mem; /* This declaration is already in vga.h */
unsigned char *vga_getgraphmem(void);
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.
svgalib(7), vgatest(6), fun(6), testlinear(6),
vga_getmodeinfo(3), vga_setpage(3), vga_setreadpage(3),
This manual page was edited by Michael Weller <email@example.com-
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
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.