pcil.c

linux 下PCI设备的扫描程序。gcc,C+ASM完成。

/*================================================
*This Utility scans all pci devices in the system.
*By Sanyo@Asustek
*===============================================*/
#include <stdio.h>
#include <unistd.h>
#include <sys/io.h>
#define PCIIndexP	0xcf8
#define PCIDataP	0xcfc
#define DummyP		0x80
unsigned short int GetVendorID(unsigned long PCIDData_T);
unsigned short int GetDeviceID(unsigned long PCIDData_T);
int 		   Prt_CPRight(void);
int main()
{
	int nLst;
	unsigned char bus,dev,func;
	unsigned long PCIAddr,PCIDData;
	unsigned int vendorID,deviceID;
	nLst=0;
	/* Get access to the ports */
	/*if(ioperm(PCIIndexP,8,1)){perror("ioperm");exit(1);}
	if(ioperm(PCIDataP ,3,1)){perror("ioperm");exit(1);}
	*/
	iopl(3);
	Prt_CPRight();
	/* Begin scan here */
	for(bus=0;bus<0xfe;bus++)
		for(dev=0;dev<=0x1f;dev++)
			for(func=0;func<=7;func++)
			{
			PCIAddr=(0x8000<<16)|((bus<<8|dev<<3|func)<<8);
				asm("movl	%1,%%eax\n"\
				    "mov	%2,%%dx\n"\
				    "out	%%eax,%%dx\n"\
				    "mov	%3,%%dx\n"\
				    "in		%%dx,%%eax\n"\
				    "movl	%%eax,%0\n"\
				    :"=a"(PCIDData)
				    :"a"(PCIAddr),"i"(PCIIndexP),"i"(PCIDataP)
				    ,"i"(DummyP)
				    );
				if(PCIDData!=0xffffffff)
				{
					vendorID=GetVendorID(PCIDData);
					deviceID=GetDeviceID(PCIDData);
					printf("%2x  Bus:%2x  Dev:%2x  Func:%x======Vendor:%4x,Device:%4x\n",nLst,bus,dev,func,vendorID,deviceID);
					nLst++;
				}
				else
				{
					break;
				}

			}
	/* We don't need the ports anymore */
	/*
	if(ioperm(PCIIndexP,8,0)){perror("ioperm");exit(1);}
	if(ioperm(PCIDataP ,3,0)){perror("ioperm");exit(1);}
	*/
	iopl(0);
	exit(0); 
}
unsigned short int GetVendorID(unsigned long PCIDData_T)
{
	unsigned short int vID=0xFFFF;
	asm("movl 	%1,%%eax\n"\
	    "mov	%%ax,%0\n" 
	   :"+d"(vID)
	   :"a"(PCIDData_T)
	   );
	return vID;
}
unsigned short int GetDeviceID(unsigned long PCIDData_T)
{
        unsigned short int dID=0xFFFF;
        asm("movl       %1,%%eax\n"\
	    "rol	$0x10,%%eax\n"\
            "mov        %%ax,%0\n"
           :"+d"(dID)
           :"a"(PCIDData_T)
           );
        return dID;
}
int Prt_CPRight(void)
{
	printf("********************************************************  \n");
	printf("            PCI List Utility 0.01 for Linux             \n\n");
	printf("                              Sanyo@AsusTek  20060406     \n");
	printf("********************************************************  \n");
	return 0;				 
}