Hello

I'm trying to port some code which interacts with memory mapped hardware registers.

The original code was developed in 2015-18 on edk2, and does not want to compile anymore.

The way it works is there are three 32 bit registers.

The first is a status/command register which I read to determine if the hardware is ready.

The next two are used to pass a 64-bit memory address (hi + lo).

Once the param registers are set, I update the command/status register and the hardware executes the command returning the results at the address provided by the two param registers.

In the original code, the address of the buffer is used to fill in the two param registers, and as far as I can tell this worked back then.

When I try to do the same, the address in my pointer is only 32 bits long, a virtual address, not a physical address.

Is there a way I can convert this 32 bit virtual address to a 64-bit physical address in a uefi shell app, or would I need a driver to do this?

I did something similar in linux for memory mapped IO, I am guessing I just haven't found the right function for this yet.

I would greatly appreciate it if someone could point me in the right direction.

Thank you

xp