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Size : 0x18 bytes

Offset Type Description
0x0 u32 Pointer to memory page used for thread local regions for threads owned by a given process
0x4 KProcess* Owner process
0x8 u32 Number of threads owned by the process
0xC char[8] Used to track the usage of thread local regions in the local page.
0x14 u32 Zero

The 8-byte array used to track the regions in use in the page works like so:

Each char is either 1 or 0, and there's one char per thread local region. 0x200 bytes per region * 8 regions is 0x1000 bytes or 1 full page. The chars are set to 1 to indicate the region is unused and 0 to indicate the region is in use.

Processes with more than 8 threads have multiple associated KThreadLocalPages which are linked together with KLinkedListNodes.