xv6-freebsd is a modification of MIT's xv6 operating system to improve its C library and set of available programs. To do this, I am working on integrating the FreeBSD 1.1.5.1 library and programs to xv6.

Warren Toomey, mid 2016

[ The original xv6 README follows ]

xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson's Unix Version 6 (v6). xv6 loosely follows the structure and style of v6, but is implemented for a modern x86-based multiprocessor using ANSI C.

ACKNOWLEDGMENTS

xv6 is inspired by John Lions's Commentary on UNIX 6th Edition (Peer to Peer Communications; ISBN: 1-57398-013-7; 1st edition (June 14, 2000)). See also http://pdos.csail.mit.edu/6.828/2014/xv6.html, which provides pointers to on-line resources for v6.

xv6 borrows code from the following sources: JOS (asm.h, elf.h, mmu.h, bootasm.S, ide.c, console.c, and others) Plan 9 (entryother.S, mp.h, mp.c, lapic.c) FreeBSD (ioapic.c) NetBSD (console.c)

The following people have made contributions: Russ Cox (context switching, locking) Cliff Frey (MP) Xiao Yu (MP) Nickolai Zeldovich Austin Clements

In addition, we are grateful for the bug reports and patches contributed by Silas Boyd-Wickizer, Peter Froehlich, Shivam Handa, Anders Kaseorg, Eddie Kohler, Yandong Mao, Hitoshi Mitake, Carmi Merimovich, Joel Nider, Greg Price, Eldar Sehayek, Yongming Shen, Stephen Tu, and Zouchangwei.

The code in the files that constitute xv6 is Copyright 2006-2014 Frans Kaashoek, Robert Morris, and Russ Cox.

The code in the non-xv6 commands and libraries are Copyright the Regents of the University of California.

ERROR REPORTS

If you spot errors in the kernel or have suggestions for kernel improvement, please send email to Frans Kaashoek and Robert Morris (kaashoek,rtm@csail.mit.edu).

If you spot errors in the libraries or the commands, please send email to Warren Toomey (wkt@tuhs.org)

BUILDING AND RUNNING XV6 WITH THE FREEBSD CHANGES

Firstly, you need a 32-bit libgcc.a somewhere on your system. On Ubuntu, I've installed the libgcc-5-dev:i386 package. Now edit Makefile.common and set LIBGCC to the location of libgcc.a.

To build xv6 on an x86 ELF machine (like Linux or FreeBSD), run "make". On non-x86 or non-ELF machines (like OS X, even on x86), you will need to install a cross-compiler gcc suite capable of producing x86 ELF binaries. See http://pdos.csail.mit.edu/6.828/2014/tools.html. Then run "make TOOLPREFIX=i386-jos-elf-".

To run xv6, install the QEMU PC simulators. To run in QEMU, run "make qemu".