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Contents Programming For PCI Device Overview Programmers Guide Scenario Access to PCI devices information How to work with PCI header Accessing PCI registers Accessing BAR0-BAR5 areas I/O Ports control Single read/write operations Data array read/write operations Accessing Physical Memory Addresses Memory Mapping Additional Functions Hardware interrupts handling at user level Common Issues Extended options of hardware interrupt handling PCI Support Routines And Structures Common Procedures OpenRapidPci IsRapidPciOpened CloseRapidPci GetHardwareConfiguration GetPciLocation PCI specific functions PCI Header GetPciHeader SetPciHeader ReadFromPci WriteToPci PCI BAR Areas GetNumOfPciBars GetPciBarLength GetPciBarPhysicalAddress GetPciBarLinearAddress ReadPciBarByte ReadPciBarWord ReadPciBarLong WritePciBarByte WritePciBarWord WritePciBarLong PCI Registers ReadPciCommandReg WritePciCommandReg ControlPciCommandRegBits ReadPciStatusReg Memory Access MapPhysToLinear UnmapMemory GetMem GetMemW GetMemL SetMem SetMemW SetMemL Direct Port I/O GetPortByte GetPortWord GetPortLong SetPortByte SetPortWord SetPortLong ReadPortBuffer WritePortBuffer Hardware Interrupts UnmaskPciIrq MaskPciIrq GetInterruptCounter		Memory Mapping Go to RapidDriver Main Page To access specified physical memory address you have to map this physical address to a linear memory of the current process' address space. RapidPci includes the function MapPhysToLinear, which performs the above task and returns the pointer to the above linear memory defined by it's physical address and size. When the pointer is not needed by application any more, this physical memory area can and must be unmapped with the function UnmapMemory. The following is an example how to get a pointer to the ROM BIOS area: char *pBios;   HANDLE hPci = NULL;   hPci = OpenRapidPci( 0 );   if (IsRapidPciOpened(hPci)) {     pBios = (char*)MapPhysToLinear(hPci,0xF8000,256); //256 bytes, starting from 0xF8000     //...pBIOS session...     UnmapMemory(hPci, 0xF8000,256); // undo mapping     hPci = CloseRapidPci(hPci);     //  close the driver   }   else      ... // failed