It's entirely possible that there exists something analogous to the HAP bit[1] or that something like me_cleaner could be developed for the PSP but AMD is not the market leader (and is frankly negligible when it comes to laptops) so much less research has been done on the AMD PSP. I remember that when excitement was building for the release of Ryzen there were petitions for AMD to open source the PSP and some talk that it might actually happen but they eventually shut the idea down during a Q&A.[2] It's a shame because it would have given AMD something to really distinguish itself from Intel and would have been viewed very positively by a lot of different communities/market segments. Really makes you think about why they didn't do it...
