Preventing a homebrew from running on PPSSPP

[TheDax]

Here are two I can think of:

1. I forget how querying flash0 works on the real PSP, but I would think if you look through our flash0's contents and only find the font folder, you're likely running on PPSSPP or JPCSP, since the real PSP undoubtedly requires all of the content to be present to function. That'd probably be the simplest way. Or, for a slight spin on that, check for flash0:/vsh/etc/version.txt. PPSSPP doesn't have a version.txt.

2. Another method could be(well, last time I checked, this was the case): kernel-only functions can be called from userland with no restrictions(I tried with sceKernelFindModuleByName), so check to see if you can call any of those with no error codes, without trying to enter kernel mode.