(This is similar to 908fb8 but for memory regions)
Removes the weird offset encoding in favour of a metadata structure,
similar to what there was before. However this structure overlaps with
the cache ram itself and grows like a stack. This is to avoid wating
memory since most games only use a few blocks.
Simplify the "dual" block lookup routines too, since they are only an
extrypoint to the other two real modes.
This improves the existing on-demand ROM paging and also breaks down ROM
buffers into 1MB blocks for platforms with memory fragmentation issues.
Fixed some potential RTC reg issue in said platforms too.
Fixed page pinning on interpreter (would crash due to LRU evictions).
This removes ram_block_ptrs and encodes the pointer directly in the
block tag. Saves ~256KB at no performance cost.
Drawback is that it limits the ram cache size to 512KB (we were using
768KB before). Should not be a problem since most games use less than
32KB of cache anyway.
Fixed ARM routines accordingly.
Seems that using the __atribute__ magic for sections is not the best way
of doing this, since it injects some default atributtes that collide
with the user defined ones. Using assembly is far easier in this case.
Reworked definitions a bit to make it easier to import from assembly.
Also wrapped stuff around macros for easy and less verbose
implementation of the symbol prefix issue.
David Guillen Fandos