9 Nov
2015
9 Nov
'15
10:40 a.m.
This is for example the ureg.c which shows the Segmentation Code for the
current SysIII Kernel I redid from original SysIII Sources + Disassembled
object-File analysis of the current SysIII Kernel running on the system:
http://cvs.laladev.org/index.html/P8000/WEGA/src/uts/sys/ureg.c?rev=1.1&…
Oliver Lehmann <lehmann(a)ans-netz.de> wrote:
I hit the send button to fast :(
Oliver Lehmann <lehmann(a)ans-netz.de> wrote:
Nick Downing <downing.nick(a)gmail.com>
wrote:
The system has right now around 6 MB of RAM but can be upgraded to 16MB
minus 64KB (Due to a firmware bug) of RAM. You can most likely implement a split I/D
architecture by having code
execute out of a different segment than data, although I haven't
checked the datasheet so I don't know for sure if this is possible.
I have 3 different MMUs available. Stack, Code and Data it is called in
the Circuit diagram. I probably have to lookup the references but I still
don't get why the kernel can only work with 64k of RAM as it is right now
compiled as a segmented programm and uses more memory already with SysIII.
Only the boot0-loader is compiled unsegmented and also some small
utilities. Every other portion of the system uses the segmentation features
of the Z8001 and is not limited to 64k adressable space.
The system has right now MB of