> No virtual memory
Are you sure about this? Xinu Timeline (3-rd paragraph on the site) states:
1988-90 - Xinu ported to 32-bit mode x86 architecture; virtual memory support added.
Disclaimer: I haven't read the code.
Are you sure about this? Xinu Timeline (3-rd paragraph on the site) states:
1988-90 - Xinu ported to 32-bit mode x86 architecture; virtual memory support added.
Disclaimer: I haven't read the code.
I just checked again. Searched for the "CR0" or "CR3" register, which would be used to set up the protected mode and virtual memory for the i386 CPU. Didn't find anything. Searched for "virtual" and found no match. Searched for "paging" and found no match. The process table entry only had the address to the starting function and the stack addresses for context switch; there's no process memory information. The process creation process didn't touch anything memory related, except setting up the stack.
I don't believe virtual memory is supported based on what's in the code.
In 2014 Dr. Comer had taped to his office door a sheet of project ideas for grad students, one of them was adding virtual memory support to Xinu.