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Fleurix

About

A prototype Unix-like kernel.

It contains 37 system calls, 7000 lines of C, over 200 lines of assembly, developed in a bochs environment. Admittedly, it can't yet shed the label of being a "toy", but it has accomplished its design goal, which is to get it running :)

It has:

  • A basic process management with fork(), exec(), exit(), wait(), signal handlings, and so on. Support a.out executable format.
  • A pure paging memory management with copy-on-write and demand paging. Support 4GB of address space for each process, sharing 128MB of kernel address space.
  • A simple minixv1 fs implementation. It's simple, and it can takes advantage of tools under Linux such as mkfs.minix, fsck.minix, etc.
  • A simple kmalloc().
  • A simple terminal.

Syscalls

static inline _SYS0(int, debug);
static inline _SYS2(int, access, char*, int);
static inline _SYS3(int, open, char*, int, int);
static inline _SYS2(int, creat, char*, int);
static inline _SYS1(int, close, int);
static inline _SYS3(int, fcntl, int, int, int);
static inline _SYS3(int, mknod, char*, int, int);
static inline _SYS3(int, write, int, char*, int);
static inline _SYS3(int, read, int, char*, int);
static inline _SYS3(int, lseek, int, int, int);
static inline _SYS1(int, chdir, char*);
static inline _SYS1(int, chroot, char*);
static inline _SYS1(int, dup, int);
static inline _SYS2(int, dup2, int, int);
static inline _SYS2(int, link, char*, char*);
static inline _SYS1(int, unlink, char*);
static inline _SYS2(int, stat, char*, struct stat*);
static inline _SYS2(int, fstat, int, struct stat*);
static inline _SYS0(int, fork);
static inline _SYS2(int, exec, char*, char**);
static inline _SYS1(int, _exit, int);
static inline _SYS1(int, nice, int);
static inline _SYS0(int, getpid);
static inline _SYS0(int, getppid);
static inline _SYS0(int, getuid);
static inline _SYS0(int, getgid);
static inline _SYS0(int, geteuid);
static inline _SYS0(int, getegid);
static inline _SYS0(int, getpgrp);
static inline _SYS0(int, setpgrp);
static inline _SYS2(int, setreuid, int, int);
static inline _SYS2(int, setregid, int, int);
static inline _SYS2(int, kill, int, int);
static inline _SYS2(int, signal, int, uint);
static inline _SYS3(int, sigaction, int, struct sigaction*, struct sigaction*);
static inline _SYS0(int, sigreturn);
static inline _SYS3(int, waitpid, int, int*, int);
static inline _SYS1(int, wait, int*);
static inline _SYS0(int, pause);

Delayed yet :(

  • not have pipes.
  • not support swap.
  • not POSIX yet.
  • not support hard disk partitioning.
  • only supports up to 128MB of physical memory.

Compiling & Testing

tools: rake, binutils(gcc, ld, as), nasm, bochs, mkfs.minix

git clone git@github.com:Fleurer/fleurix.git
cd fleurix
rake

Write your own programs under Fleurix

Create a new .c file in the usr/ directory, then execute:

rake

Contributing

  1. Fork it.
  2. Create a branch (git checkout -b my_markup)
  3. Commit your changes (git commit -am "Added Snarkdown")
  4. Push to the branch (git push origin my_markup)
  5. Create an Issue with a link to your branch
  6. Enjoy a refreshing Diet Coke and wait