forums.ps2dev.org

[Dariusc123456]

Hey,
I have a question about the vsh mode - 0x0800 thats use for the psp to access VSH mode. What functions are then allow when you are in VSH mode? I know what User and Kernel Function are, but vsh?

I have never use 0x800, and I ask because I took a look at 3.40 OE source code and found that in there.
_________________
PSHN - Playstation Hacking Network
PSX/PS1 - HACK - Game Shark
PS2 - HACK - Swap
PSP - HACK - Pandora
PS3 - ?

[m0skit0]

VSH mode corresponds to supervisor mode in MIPS modes. It's a mode between user and kernel. More access than user, less access than kernel :)
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[Dariusc123456]

So VSH mode is just a mid-mode to access user (more) and kernel (less)?
_________________
PSHN - Playstation Hacking Network
PSX/PS1 - HACK - Game Shark
PS2 - HACK - Swap
PSP - HACK - Pandora
PS3 - ?

[ne0h]

[coolkehon]

so what exactly can this do extra besides user and how do i get my app to start in this

[m0skit0]

As far as MIPS concerns, supervisor mode has access to 0xc0000000 to 0xdfffffff besides access to user mode memory (below 0x80000000). But how this translates to the actual PSP architecture, I don't know...
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[Dariusc123456]

I wonder if there's an extra memory that has a higher user and kernel. I am not talking about service mode (if there is one), but there's has to be something Sony use to access the extra memory that we cant get into. If we can access this memory, maybe we can dump the pre-IPL without service mode.
_________________
PSHN - Playstation Hacking Network
PSX/PS1 - HACK - Game Shark
PS2 - HACK - Swap
PSP - HACK - Pandora
PS3 - ?

[Torch]

Some of the firmware functions have different privileges in VSH mode. In some cases even more than kernel mode. E.g. You can directly reassign flash0: for write access in VSH mode using the usual sce* functions, but you cannot do this even in kernel mode without some extra work like manually setting user level etc.