//-------------------------------------------------------------------
//	82573pci.cpp
//
//	This program displays the PCI Configuration Space registers
//	for the Intel 82573L PRO1000 Gigabit Ethernet controller in
//	our classroom's workstations or our anchor-cluster servers.
//
//	     compile using:  $ g++ 82573pci.cpp -o 82573pci
//	     execute using:  $ sudo ./82573pci
//
//	programmer: ALLAN CRUSE
//	written on: 16 APR 2009
//-------------------------------------------------------------------

#include <stdio.h>	// for printf(), perror() 
#include <unistd.h>	// for read(), write(), close() 
#include <sys/io.h>	// for iopl(), in(), out()

#define VENDOR_ID	0x8086	// Intel Corporation
#define DEVICE_ID	0x109A	// 82573L controller

#define CONFADD 	0x0CF8
#define CONFDAT 	0x0CFC
#define PMC		0x0CFB

char legend1[] = "PCI Configuration Space for ";
char legend2[] = "Intel 82573L Gigabit Ethernet Controller";

int main( int argc, char **argv )
{
	// adjust the IOPL-field in the processor's FLAGS register
	if ( iopl( 3 ) < 0 ) { perror( "iopl" ); return 1; }

	// insure that PCI configuration mechanism #1 is enabled
	outb( inb( PMC ) | 1, PMC );

	// perform a PCI bus-scan to locate the 82773L controller
	for (int bus = 0; bus < (1 << 8); bus++)
	for (int dev = 0; dev < (1 << 5); dev++)
		{
		int 	busdev = (bus << 16)|(dev << 11)|(1 << 31);
		outl( busdev, CONFADD );

		int	pcidat = inl( CONFDAT );
		if ( pcidat == ~0 ) continue;
		
		int	vendor = (pcidat >>  0)&0xFFFF;
		if ( vendor != VENDOR_ID ) continue;

		int	device = (pcidat >> 16)&0xFFFF;
		if ( device != DEVICE_ID ) continue;

		// exhibit the 82573's Configuration Space registers
		printf( "\n      %s%s \n", legend1, legend2 );
		for (int reg = 0; reg < 0x100; reg +=4)
			{
			if ( (reg % 32) == 0 ) printf( "\n 0x%03X: ", reg );
			outl( busdev | reg, CONFADD );
			pcidat = inl( CONFDAT );
			printf( "%08X ", pcidat );
			}
		printf( "\n" );
		}		
	printf( "\n" );
}