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Port of Xv6 for 25∞2
873 commits 1 branch 0 tags 18 MiB
C 94.5%
Assembly 3.4%
Makefile 1.9%
Perl 0.2%
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Frans Kaashoek 8320d61be5 Pick up where i left off in april: 
- move log into metadata part of disk, so that marking
that the log's blocks are in use falls out for free
- superblock describes the whole disk (sizes and offets)
- sizes and offsets are computed in one place (mkfs) and
the rest of the code refers to the superblock for these values,
instead of recomputing them.
2015-06-27 12:39:13 -04:00
.cvsignore update .cvsignore 2008-10-15 04:54:24 +00:00
.dir-locals.el Setting indent-tabs-mode nil everywhere is dangerous 2011-09-05 15:22:16 -04:00
.gdbinit.tmpl Use the symbol file 2009-09-20 23:08:36 -04:00
.gitignore Sync up clean and gitignore better 2011-09-05 15:21:40 -04:00
asm.h add some comments 2010-08-05 21:16:55 -04:00
bio.c Disentangle block size from the disk's sector size. Set block size to 1024 to show 2015-04-03 08:22:02 -04:00
bootasm.S comment nits 2011-09-12 14:27:14 -04:00
bootmain.c Disentangle block size from the disk's sector size. Set block size to 1024 to show 2015-04-03 08:22:02 -04:00
buf.h Disentangle block size from the disk's sector size. Set block size to 1024 to show 2015-04-03 08:22:02 -04:00
BUGS sh 2007-09-05 15:55:43 +00:00
cat.c more consistent spacing 2007-08-28 18:32:08 +00:00
console.c Remove unused 'state' variable that broke the build in recent gcc's 2011-09-07 16:39:27 -04:00
cuth delete unnecessary #include lines 2007-08-27 23:26:33 +00:00
date.h whoops. forgot date.h 2014-09-12 18:41:38 -04:00
defs.h Pick up where i left off in april: 2015-06-27 12:39:13 -04:00
dot-bochsrc make bochsrc work for bochs 2.2.6 2008-09-03 14:10:47 +00:00
echo.c Remove puts in favor of printf. 2007-08-24 20:03:40 +00:00
elf.h Make elf proghdr fields match what objdump prints 2011-08-17 20:23:36 -04:00
entry.S more regular kmap[] and description 2011-09-13 12:28:45 -04:00
entryother.S Fix stale comments in entryother.S 2011-09-04 15:56:16 -04:00
exec.c a start at concurrent FS system calls 2014-08-27 17:15:30 -04:00
fcntl.h nit 2007-08-28 04:13:24 +00:00
file.c a start at concurrent FS system calls 2014-08-27 17:15:30 -04:00
file.h Nice layout for a printout of the code 2014-08-29 17:06:49 -04:00
forktest.c Initial version of single-cpu xv6 with page tables 2010-07-02 14:51:53 -04:00
fs.c Pick up where i left off in april: 2015-06-27 12:39:13 -04:00
fs.h Pick up where i left off in april: 2015-06-27 12:39:13 -04:00
gdbutil GDB utilities 2009-11-23 17:47:57 -05:00
grep.c Fix missing NUL-terminator in grep 2015-03-24 20:54:39 -04:00
ide.c check blockno passed to idestart 2015-04-10 07:15:06 -04:00
init.c group locks into structs they protect. 2009-05-31 05:12:21 +00:00
initcode.S Remove sys_init syscall 2011-08-22 20:05:15 -04:00
ioapic.c trap cleanup 2009-07-11 19:24:56 -07:00
kalloc.c eliminate enter_alloc -- use kalloc for everything 2011-09-13 13:14:52 -04:00
kbd.c be consistent: no underscores in function names 2009-03-08 22:07:13 +00:00
kbd.h formatting; split kbd constants into kbd.h 2007-08-14 19:31:16 +00:00
kernel.ld Nuke data.S, since we do have a custom linker script. 2011-09-02 14:51:55 -04:00
kill.c Disentangle block size from the disk's sector size. Set block size to 1024 to show 2015-04-03 08:22:02 -04:00
lapic.c cmosgetdate() for system-call homework 2014-09-12 18:09:51 -04:00
LICENSE Add MIT license file; update xv6-rev2.tar.gz with LICENSE. 2009-05-26 16:58:33 +00:00
ln.c add ln 2007-08-22 05:54:55 +00:00
log.c Pick up where i left off in april: 2015-06-27 12:39:13 -04:00
ls.c Remove puts in favor of printf. 2007-08-24 20:03:40 +00:00
main.c Pick up where i left off in april: 2015-06-27 12:39:13 -04:00
Makefile Increase VM memory when running qemu-memfs 2014-10-03 09:44:26 -04:00
memide.c Disentangle block size from the disk's sector size. Set block size to 1024 to show 2015-04-03 08:22:02 -04:00
memlayout.h more regular kmap[] and description 2011-09-13 12:28:45 -04:00
mkdir.c more consistent spacing 2007-08-28 18:32:08 +00:00
mkfs.c Pick up where i left off in april: 2015-06-27 12:39:13 -04:00
mmu.h Correct a security bug in copyuvm() 2013-03-04 16:16:54 -05:00
mp.c Avoid "boot" in xv6 2011-08-15 20:11:13 -04:00
mp.h Nice layout for a printout of the code 2014-08-29 17:06:49 -04:00
Notes nit in console interrupts 2006-09-07 00:00:33 +00:00
param.h check blockno passed to idestart 2015-04-10 07:15:06 -04:00
picirq.c Get rid of the blank page in picirq.c. It misaligs things now. 2010-09-02 18:36:06 -04:00
pipe.c Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
pr.pl remove //DOC in the right place 2009-07-12 19:07:30 -07:00
printf.c spaces around else for rtm 2007-08-28 18:37:41 +00:00
printpcs Various fixes and improvements to printpcs 2012-08-24 14:51:52 -04:00
proc.c Pick up where i left off in april: 2015-06-27 12:39:13 -04:00
proc.h use acquire/release to force order for pid=np->pid;np->state=RUNNING 2014-08-04 06:13:49 -04:00
README Ack all bug reports and patches. Is this all of them? 2014-08-29 09:03:29 -04:00
rm.c more consistent spacing 2007-08-28 18:32:08 +00:00
runoff no need to generate postscript version 2014-08-29 17:10:32 -04:00
runoff.list Remove data.S from runoff, too 2011-09-02 14:52:53 -04:00
runoff.spec Nice layout for a printout of the code 2014-08-29 17:06:49 -04:00
runoff1 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
sh.c move jkstack to main.c 2010-08-05 14:15:03 -04:00
show1 PDF at http://am.lcs.mit.edu/~rsc/xv6.pdf 2007-08-22 06:01:32 +00:00
sign.pl spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
sleep1.p Model verifying that wakeup really 2007-10-12 04:21:04 +00:00
spinlock.c Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
spinlock.h Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
spinp Model verifying that wakeup really 2007-10-12 04:21:04 +00:00
stat.h junk 2012-08-28 12:57:05 -04:00
stressfs.c Update stressfs to trigger race now the logging code serializes writes 2011-09-27 12:59:47 -04:00
string.c Use stosl in memset; makes boot time bearable 2011-09-01 10:41:27 -04:00
swtch.S move jkstack to main.c 2010-08-05 14:15:03 -04:00
symlink.patch symlink implementation 2007-08-30 18:36:38 +00:00
syscall.c Remove left-over from some logging plan making complete syscalls atomic 2012-08-22 20:28:58 -04:00
syscall.h Remove left-over from some logging plan making complete syscalls atomic 2012-08-22 20:28:58 -04:00
sysfile.c a start at concurrent FS system calls 2014-08-27 17:15:30 -04:00
sysproc.c cmosgetdate() for system-call homework 2014-09-12 18:09:51 -04:00
timer.c shuffle and tweak for formatting. 2009-08-08 01:07:30 -07:00
toc.ftr Update index example in TOC footer 2011-09-02 16:30:20 -04:00
toc.hdr nits 2007-08-28 18:23:48 +00:00
trap.c Map kernel high 2011-07-29 07:31:27 -04:00
trapasm.S One definition of several macros and constants 2011-08-08 13:30:08 -04:00
traps.h kill TLB shoot down code 2010-07-28 14:38:05 -04:00
TRICKS use acquire/release to force order for pid=np->pid;np->state=RUNNING 2014-08-04 06:13:49 -04:00
types.h some cleanup 2010-07-25 20:30:21 -04:00
uart.c shuffle and tweak for formatting. 2009-08-08 01:07:30 -07:00
ulib.c make new code like old code 2011-01-11 13:01:13 -05:00
umalloc.c make new code like old code 2011-01-11 13:01:13 -05:00
user.h cmosgetdate() for system-call homework 2014-09-12 18:09:51 -04:00
usertests.c i think this is a working concurrent logging scheme 2014-08-28 05:57:47 -04:00
usys.S uptime() sys call for benchmarking 2010-08-11 14:34:45 -04:00
vectors.pl sync with c; .text is implied 2009-05-31 01:00:38 +00:00
vm.c Nice layout for a printout of the code 2014-08-29 17:06:49 -04:00
wc.c junk 2012-08-28 12:57:05 -04:00
x86.h Remove unused x86.h definitions 2011-09-02 14:52:13 -04:00
zombie.c delete unnecessary #include lines 2007-08-27 23:26:33 +00:00

README 

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/6.828/2012/v6.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.

ERROR REPORTS

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

BUILDING AND RUNNING XV6

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".

To create a typeset version of the code, run "make xv6.pdf".  This
requires the "mpage" utility.  See http://www.mesa.nl/pub/mpage/.