mit-pdos / xv6-riscv-fall19 Goto Github PK

6.S081/6.828 lab repo for fall 2019

License: Other

Emacs Lisp 0.03% Makefile 2.33% C 81.78% C++ 1.94% Assembly 2.74% Perl 0.21% Shell 0.03% Python 10.93%

xv6-riscv-fall19's Introduction

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 RISC-V 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 https://pdos.csail.mit.edu/6.828/, which
provides pointers to on-line resources for v6.

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

We are also grateful for the bug reports and patches contributed by
Silas Boyd-Wickizer, Anton Burtsev, Dan Cross, Cody Cutler, Mike CAT,
Tej Chajed, eyalz800, Nelson Elhage, Saar Ettinger, Alice Ferrazzi,
Nathaniel Filardo, Peter Froehlich, Yakir Goaron,Shivam Handa, Bryan
Henry, Jim Huang, Alexander Kapshuk, Anders Kaseorg, kehao95, Wolfgang
Keller, Eddie Kohler, Austin Liew, Imbar Marinescu, Yandong Mao, Matan
Shabtay, Hitoshi Mitake, Carmi Merimovich, Mark Morrissey, mtasm, Joel
Nider, Greg Price, Ayan Shafqat, Eldar Sehayek, Yongming Shen, Cam
Tenny, tyfkda, Rafael Ubal, Warren Toomey, Stephen Tu, Pablo Ventura,
Xi Wang, Keiichi Watanabe, Nicolas Wolovick, wxdao, Grant Wu, Jindong
Zhang, Icenowy Zheng, and Zou Chang Wei.

The code in the files that constitute xv6 is
Copyright 2006-2019 Frans Kaashoek, Robert Morris, and Russ Cox.

ERROR REPORTS

Please send errors and suggestions to Frans Kaashoek and Robert Morris
(kaashoek,[email protected]). The main purpose of xv6 is as a teaching
operating system for MIT's 6.828, so we are more interested in
simplifications and clarifications than new features.

BUILDING AND RUNNING XV6

You will need a RISC-V "newlib" tool chain from
https://github.com/riscv/riscv-gnu-toolchain, and qemu compiled for
riscv64-softmmu. Once they are installed, and in your shell
search path, you can run "make qemu".

xv6-riscv-fall19's People

Contributors

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xiw aquayi lujunweng jaic1 lukenels rtmrtmrtmrtm foxboy26 typingkoala yosefmih prajwalm2212 pleiadesian mwl10 colbymorrison hbdf averynortonsmith luoyhang003 tuangu reminiscent mxh1995 chang-steve maochongxin peterg17 tanishqjasoria milesdai amyoconnell mcimiolek a-lavis jinlv bym520zy sudk1896 akhilj99 coldcutter yangyi625 sznalan29 lionxu hjiefeng gyhanis junfengan1998 kewudu blankrh stanley255 sachinboban linuxxxer zhaohao16 finnchen gshex childerolando kevindong0810 renlulu jalinwang jianyutang usherasnick lyxyaoxiong sjdalessandro tongxin97 fisop sashapd cccriscv vinackylee gcnyin narutolhy zeroslope nishanthjagadish matlapo zuki tenkjm panjingyu iguoyr smoky96 bugorz q435 successcw heartever stskyblade xbfool luckysunfd topefremov wesleymesquita shapooo joshsukhdeo withgjr stplaydog eugene536 jackhannnnnn jesse-duanji gs-niteesh wesley-jzy dpkdeepakmohan bigyin1 photon8231 kevin-mei liuhanzhang ailinzhou lly8877 unitsua cs-backyard abcdlsj zhyoulun merhs ali-anas

xv6-riscv-fall19's Issues

util lab grade script issues

when I tested xargs function, I got this result.

I think it is right result.
But when I run make grade, I got some error like that
So I test again like this

I find DONE print earlier than three hello. Maybe this caused grade error.
I try to fix this, but I failed. And I try to change the test_xargs() like that

Then I run make grade, and get 100 points.

Sorry for my poor English.
Hopefully get your respond. Thanks!
And my code repo is here

Some error in "Lab: Xv6 and Unix utilities"

Hi, sorry to bother, I'm a CS student in China. Recently, I got some problem when working on the first lab. When I run sleep or pingpong, it will show some error message like below.

I can tell now it's some problem about syscall, but still can't solve it. Can you help me a little bit.

And it's my code below. Thanks a lot.

confused and useless arguments

one of the argument of bd_mark_unavailable in branch alloc and file buddy.c is useless and confused

int
bd_mark_unavailable(void *end, void *left)

the void *left is never used and seems it's ok to remove

Question: is the following `kvminithart()` redundant since paging is already enabled

xv6-riscv-fall19/kernel/proc.c

Line 45 in dbb036f

kvminithart();

void
procinit(void)
{
  struct proc *p;
  
  initlock(&pid_lock, "nextpid");
  for(p = proc; p < &proc[NPROC]; p++) {
      initlock(&p->lock, "proc");

      // Allocate a page for the process's kernel stack.
      // Map it high in memory, followed by an invalid
      // guard page.
      char *pa = kalloc();
      if(pa == 0)
        panic("kalloc");
      uint64 va = KSTACK((int) (p - proc));
      kvmmap(va, (uint64)pa, PGSIZE, PTE_R | PTE_W);
      p->kstack = va;
  }
  kvminithart(); // Is this redundant ?
}

How to debug users program using gdb

Hi, all

make qemu-gdb

i can use the cmd to debug kernel/kernel , but it can't find users/*.c when set breakpoint to users/ls.c:ls

who can help me, tks~~

mit-pdos / xv6-riscv-fall19 Goto Github PK

xv6-riscv-fall19's Introduction

xv6-riscv-fall19's People

Contributors

Stargazers

Watchers

Forkers

xv6-riscv-fall19's Issues

util lab grade script issues

Some error in "Lab: Xv6 and Unix utilities"

confused and useless arguments

Question: is the following `kvminithart()` redundant since paging is already enabled

How to debug users program using gdb

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