PSPEmu | Secure Processor or PSP with the goal to understand AMDs

PSPEmu is a C library. PSPEmu has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

This is an emulator for AMDs (Platform) Secure Processor or PSP with the goal to understand AMDs prorietary AGESA code running on the PSP by watching execution of the involved code modules. The PSP is the first processor to run on an AMD CPU after power is applied and is responsible for bootstrapping the whole system. It loads firmware for other micro controllers inside the CPU like the SMU for instance and initializes the memory controllers so DRAM is fully initialized when the first instruction starts executing on the x86 cores. The PSP also acts as the systems trust anchor by doing signature verification for loaded code including the UEFI firmware running on the x86 cores and implementing a firmware TPM on some models. On EPYC the PSP is responsible for key management and programming the encryption keys for the AES engines inside the memory controllers for AMDs Secure Encrypted Virtualization (SEV) feature.