//-------------------------------------------------------------------
//	mmtest.cpp
//
//	This program tests the 'mymmfb.c' character driver, which is
//	supposed to statically map the video frame-buffer to a known
//	user-space address when the '/dev/vram' file is opened.
//
//	NOTE: Written and tested with Linux kernel version 2.4.20.
//	
//	programmer: ALLAN CRUSE
//	written on: 29 APR 2003
//-------------------------------------------------------------------

#include <stdio.h>	// for printf(), perror() 
#include <fcntl.h>	// for open() 
#include <stdlib.h>	// for exit() 
#include <unistd.h>	// for read(), write(), close() 

#define HRES 1280
#define VRES 1024

char filename[] = "/dev/vram";
long *vram = (long*)0x10000000;

int main( int argc, char **argv )
{
	// open the device file and determine video memory size
	int	mm = open( filename, O_RDWR );
	if ( mm < 0 ) { perror( filename ); exit(1); }
	int	vramsize = lseek( mm, 0, SEEK_END );
	printf( "\n\tvramsize=%d bytes (%d MB)\n\n", vramsize, vramsize>>20 );
	
	// do some drawing (to verify the memory mapping)
	long	color = 0x0000FFFF;
	for (int i = 0; i < 50*HRES; i++) vram[i] = color;

	// close the device file and exit
	close( mm );
	exit(0);
}