Processor Control Region (PCR) is a Windows kernel mode data structure that contains information about the current processor. It can be accessed via the fs segment register.
Contents
Structure
In C and C++, the PCR is known as KPCR. It contains information about the current processor.
Processor Control Block
The PCR contains a substructure called Processor Control Block (KPRCB), which contains information such as CPU step and a pointer to the thread object of the current thread.
References
Processor Control Region Wikipedia(Text) CC BY-SA