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Function RTT_BIOS_ReadConfigData

This function allows reading individual bytes, words, or dwords from the configuration space of a specific device:

int RTT_BIOS_ReadConfigData(BYTE   Bus, 
                            BYTE   DeviceFunc, 
                            int    Register, 
                            int    Width, 
                            void * Value);

Parameters

Bus

Bus number to read from.

DeviceFunc

Device number in bits 7 .. 3 and the function number in bits 2 .. 0 for the device to read from.

Register

Register to read from. Must be divisible by Width and cannot be larger than 255.

Width

May be 1, 2, or 4 for byte, word or dword access.

Value

If the function succeeds, the read data is returned at *Value.

return value

RTT_BIOS_SUCCESSFUL or an error code, see section PCI BIOS.

PCI BIOS

Function RTT_BIOS_GenSpecialCycle

Function RTT_BIOS_WriteConfigData