memorymap.c: initialize mappings array with zeros

[pavelkryukov]

For my experiments, I used to create memory_map on dynamic memory, and it was not initialized with zeroes by default.

[tj90241]

Are you sure about this one? The device (and thus bus structure, etc.) should be allocated by cen64_alloc here: https://github.com/tj90241/cen64/blob/72c778c3bfb25262498af6a21e8dec828a28be19/cen64.c#L175

This function is a wrapper around the OS's allocator, which is expected to wipe pages prior to returning them (and where the OS maybe does not, cen64 does):
https://github.com/tj90241/cen64/blob/master/os/posix/alloc.c#L41

[pavelkryukov]

Hmm. that would be hard to reproduce...
I found that I do not need to allocate memory_map on heap and removed the patch which triggered the issue.

And, just to mention: I used Windows Subsystem on Linux when I got rubbish in that structure.

[tj90241]

Bahhh, Microsoft strikes again... ok, sounds like this is needed then until we figure out something better.

[pavelkryukov]

(Spoiler alert: CEN64 does not start audio and video on WSL anyway. Luckily, I do not need them yet)

[tj90241]

Interesting integration of your simulator into CEN64 btw, will look at this sometime!

[pavelkryukov]

Thanks! Our simulator is still far away from being functionally compatible with MIPS ISA.
For now, it executes only the first instruction (lui $t1, 0x3400) as the second instruction is CP0 which we do not yet support.