Texas Instruments TNETE211, TNETE110A, TNETE100A Following example reads a byte of a PCI register

PCI Configuration Space

r.h.ah = PCI_FUNCTION_ID; r.h.al = FIND_PCI_DEVICE; r.x.cx = DeviceID; r.x.dx = VendorID; r.x.si = Index; int86(PCI_INT, &r, &r); *pDev = (WORD)r.x.bx; return (int)r.h.ah;

}

This code returns the function ID that is used to request reads and writes to the ThunderLAN PCI configuration space; this varies from installation to instal- lation, based on hardware implementation and slot. This ID is necessary to de- termine where ThunderLAN is. The device ID indicates a networking card, and the vendor ID is the manufacturer code. These values can be overlaid in the configuration space with values from the EEPROM during the autoconfigura- tion. These should be available to the driver software either in the BIOS ROM or on machine-readable media supplied with the network board(s).

The following example reads a byte of a PCI register:

//±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±

//PciRdByte() ± Read a byte from PCI configuration space

//Parameters:

//	devid	WORD	pci device identifier
//	addr	WORD	config address
//

//Return val:

// BYTEvalue read

//±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±± BYTE PciRdByte(WORD devid, WORD addr)

{
union REGS r;
r.h.ah = PCI_FUNCTION_ID;	/*	PCI_FUNCTION_ID
0xB1 */
r.h.al = READ_CONFIG_BYTE;	/*	READ_CONFIG_WORD
0x09 */
r.x.bx = devid;

ThunderLAN Registers 2-7