Register Access Interface Overview

The Register Access platform service is provided by functions of +the AsspRegister class. The AsspRegister class is defined in the os/kernelhwsrv/kernel/eka/include/kernel/arm/assp.h file. The functions defined in the AsspRegister class must be implemented +in the baseport variant to allow device drivers and other kernel side +code to access registers.

+ Register read functions + + + +API +Description + + + + +AsspRegister::Read8(TLinAddr aAddr) +Read the contents of an 8 bit register + + +AsspRegister::Read16(TLinAddr aAddr) +Read the contents of a 16bit register + + +AsspRegister::Read32(TLinAddr aAddr) +Read the contents of a 32 bit register + + +AsspRegister::Read64(TLinAddr aAddr) +Read the contents of a 64 bit register + + + +

Register +write functions + + + +API +Description + + + + +AsspRegister::Write8(TLinAddr aAddr, TUint8 aValue) +Store a new value in an 8 bit register. + + +AsspRegister::Write16(TLinAddr aAddr, TUint16 aValue) +Store a new value in a 16 bit register. + + +AsspRegister::Write32(TLinAddr aAddr, TUint32 aValue) +Store a new value in a 32 bit register. + + +AsspRegister::Write64(TLinAddr aAddr, TUint64 aValue) +Store a new value in a 64 bit register. + + + +

The difference between write and modify +functions is that the modify function allows the client to change +partial contents of a register using masks.

+ + + +API +Description + + + + +AsspRegister::Modify8(TLinAddr aAddr, TUint8 aClearMask, +TUint8 aSetMask) +Modify the contents of an 8 bit register. + + +AsspRegister::Modify16(TLinAddr aAddr, TUint16 aClearMask, +TUint16 aSetMask) +Modify the contents of a 16 bit register. + + +AsspRegister::Modify32(TLinAddr aAddr, TUint32 aClearMask, +TUint32 aSetMask) +Modify the contents of a 32 bit register. + + +AsspRegister::Modify64(TLinAddr aAddr, TUint64 aClearMask, +TUint64 aSetMask) +Modify the contents of a 64 bit register + + + +

The header file for the Registry Access platform service +can be found here.