Startup, Shutdown, and Provisioning
Startup here is defined as software operations that occur each time a platform boots. The boot can be a cold boot, or it can be what in PC terms is called a resume from suspend or a boot from hibernate. The TPM holds several classes of volatile state, including PCR values, loaded sessions and keys, enables, authorization and policy values, hybrid NV indexes, and clock state. Based on the type of power cycle, this volatile state must either persist or be initialized. The TPM provides two commands that, in various combinations, permit external software to manage the power-cycle requirements.