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bss segment may have some of it at the end of data, but the bits that lie on a new page need to be mmaped as anonymous. When this occured we were not passing the new page boundary but the last data page where bss started
Codezero POSIX Services This directory contains the source code for the POSIX services developed on top of the Codezero Microkernel. There is a pager called MM0 which demonstrates how a pager on top of Codezero should act, by its system call usage. FS0 is the VFS task that implements File IO via IPC. FS0 can be thought of as a micokernel server. Test0 is the userspace task that tests microkernel system call functionality as well as the POSIX system call functionality by issuing calls to MM0 and FS0. Codezero POSIX services partially demonstrate how a POSIX level operating system would be written on top of Codezero. Unlike shallow implementations on embedded systems that only look like POSIX, mm0 and fs0 implement a real virtual memory subsystem and virtual filesystem that solidly backs the API. Neverhteless services such as terminal IO and common filesystem support are currently missing.