SimpleThread

The SimpleThread class derives from the ThreadState class, and is used to provide all architectural state for models that don't need anything more complex. It is basically the context of a hardware thread, and provides all necessary functions needed to access it as defined by the ThreadContext class. However, SimpleThread does not actually derive from ThreadContext, but rather uses a proxy class to forward all ThreadContext function calls to its own functions. This allows the CPU models to use SimpleThread without paying for virtual function overhead.

The SimpleThread class has:

• An architected register file, including the PC, next PC, integer, FP, and miscellaneous registers
• A pointer to the thread's CPU
• A pointer to the ITB, the DTB
• A pointer to the system
• A pointer to the thread's ThreadContext proxy
• All state from ThreadState, such as kernel statistics and memory ports