//-------------------------------------------------------------------
//	nicregs.cpp
//
//	This program utilizes our 'mmap8139.c' device-driver to map 
//	the RealTek 8139 network interface registers to user-space. 
//
//	It is assumed that the System Administrator has created the
//	required character-mode device-node in the '/dev' directory
//	before the user attempts to execute this program:
//
//			root#  mknod /dev/nic c 98 0
//			root#  chmod a+rw /dev/nic
//
//	programmer: ALLAN CRUSE
//	written on: 04 APR 2005
//-------------------------------------------------------------------

#include <stdio.h>	// for printf(), perror() 
#include <fcntl.h>	// for open() 
#include <stdlib.h>	// for exit() 
#include <sys/mman.h>	// for mmap(), munmap()

char devname[] = "/dev/nic";

int main( int argc, char **argv )
{
	// open the device-file
	int	fd = open( devname, O_RDONLY );
	if ( fd < 0 ) { perror( devname ); exit(1); }

	// map the device's io-memory to user-space
	int	prot = PROT_READ;
	int	flag = MAP_SHARED;
	int	size = 0x100;
	int	base = 0;
	void	*vm = mmap( NULL, size, prot, flag, fd, 0 );
	if ( vm == MAP_FAILED ) { perror( "mmap" ); exit(1); }

	// display the contents of io-memory in hexadecimal format
	printf( "\n\nRealTek 8139 Registers mapped at %p \n", vm );	
	unsigned long 	*lp = (unsigned long *)vm;
	for (int i = 0; i < 64; i++)
		{
		if ( ( i % 8 ) == 0 ) printf( "\n%02X: ", i*4 ); 
		printf( "%08lX ", lp[ i ] );
		}
	printf( "\n\n\n" );
}