Linux 0.01 - Remake
                    ===========================
                       By Abdel Benamrouche  
                        draconux@gmail.com
                            2007-11-25



this is all patchs needed to get linux 0.01.rm3 from old linux 0.01
linux 0.01.rm3 is a "rebuild" of the linux 0.01.
so you can :
=> build it from your new linux 2.6 using gcc ( 4.x, 3.x or 2.95 )
=> run it in an emulator. (should also work in real computer, but not yet tested)
=> use elf format insetead of a.out ( needed to build some userland program )
=> I have ported :
	- bach-3.2 ( with completion and history )
	- some programe of coreutils-6.9 ( ls, dir, rm, cat, echo etc ...)
	- dietlibc 0.31 ( I don't use glibc )
	- bin86 0.16.17 ( as86 is needed to build linux 0.01 )
	- make-3.81 (seem to work)
	- ncurses 2.0.7 ( I use the static library, needed by vim, less, m-emacs)
	- vim 7.1 ( but ... scrolling up don't work well :( )

	
old linux 0.01
================

Official release of linux 0.01 ( created in 1991 by linus):
ftp://ftp.kernel.org/pub/linux/kernel/Historic/linux-0.01.tar.bz2

If you have an old computer with minix ( 1.5 I think) with Evan's patch,
and old gnu utilities then you should be able to run this old linux kernel.
without changing linux code (exept hardcoded HDD parameters + main Makefile).


version system :
=================

linux 0.01-rm-x.y
Ok I use "rm" because this is not an official linux work.
rm mean remake.

Since 0.01 will never change, x is the main version and y is the minor.
x = 1 : get linux with gcc-1.4 to work in newer computer. (mainly bug fix)
x = 2 : get linux with newer gcc to work.
x = 3 : the goal is to have linux 0.01 working whith bash (ok), gcc (not done), and an editor (not done).


download :
===========

You can find all patch, kernel sources, et needed software here :



patch_rm_1.0 :
==============

fix boot/boot.s :
as86 comment syntax is not the same as in 1991 :
use ';' instead of '|'
( nb boot/boot.s need as86, which is not gas )



patch_rm_1.1 :
==============

Makefile update :
- remove -mstring-insns from Makefile. 
- remove minix specific stuff ( chmem & sync not needed)
- build/tool.s is built using new gcc, boot.s use as86. All others
  file need gcc 1.4 and old version of gas


patch_rm_1.2 :
=============

- Makefile,hdreg.h,config.h & hd.c updated (contain hardcoded
  information as HDD geometry)

from this version you probably can run linux if you have an old computer :)
( don't work yet with qemu ... )

patch_rm_1.3:
============

bug fix in a.out.h:
- N_MAGIC macro updated ...
  We use same version of tools as linus, so it's strange to get 
  different behaviour. 

18c18
< #define N_MAGIC(exec) ((exec).a_magic)
---
> #define N_MAGIC(exec) ((exec).a_magic & 0xffff )


patch_rm_1.4:
=============

bug fix in kernel/hd.c:

224c224
<       if((i = inb(ERR_STAT)) != 1)
---
>       if((i = inb(HD_STATUS)) & ERR_STAT)


patch_rm_1.5 :
=============

minor bug fix in fs/exec.c :
-4 is not needed since we alredy do it inside copy_strings.
(at line 184 of the same file)

270c270
<       p = copy_strings(envc,envp,page,PAGE_SIZE*MAX_ARG_PAGES-4);
---
>       p = copy_strings(envc,envp,page,PAGE_SIZE*MAX_ARG_PAGES);


patch_rm_1.6 :
============

serious bug in hd.c :
When we read hdd, we read 2 block of 512 bytes.

In Qemu read interruption is called while executing port_read.
So this_request->nsector is not yet decremented.

this patch fix this problem.

259,262c259,265
<       port_read(HD_DATA,this_request->bh->b_data+
<               512*(this_request->nsector&1),256);
<       this_request->errors = 0;
<       if (--this_request->nsector)
---
> 
>       if (this_request->nsector==2){
>               this_request->nsector--;
>               port_read(HD_DATA,this_request->bh->b_data,256);
>       }
>       else{
>               port_read(HD_DATA,this_request->bh->b_data+512,256);
263a267,270
>       }
> 
>       this_request->errors = 0;
> 


With this patch you can run old linux in a newer computer (not tested)
 and in qemu (test ok):
hello world program work fine :)

for more info about runing this version of linux read :
read http://draconux.free.fr/download/os-dev/linux0.01/doc_linux_0.01/LINUX_0.01_GCC_1.40 for more info


patch_rm_1.7 :
=============

minor fix in tool/build.c needed by qemu.
the flopy Image size is not a multiple of the sector size. So qemu
may not read last flopy sector.


patch_rm_2.0 :
=============

use gcc-2.95 or gcc-3.3 instead of gcc-1.4
from gcc-1.4 too gcc-3.x they are too much change (mainly in asm syntax)

Warning :
If you find somewhere asm constraint error, please be nice enough to tell me :)


patch_rm_2.1 :
=============

fix compilation warning


patch_rm_2.2 :
==============

use gcc-4.x.


patch_rm_3.0 :
=============

use elf binary format instead of a.out.


patch_rm_3.1 :
=============

- added getdents system call


patch_rm_3.2 :
=============

- asm constraint bug fix


patch_rm_3.3 :
=============

- some change in system call.

patch_rm_3.4 removed
====================

patch_rm_3.5 (080125):
==============

- use stat to get file size in Makefile
- fix warning in unistd.h


roadmap  :
========================

- porting an advanced editor ( vim or emacs )
vim already works but with strange "scrolling up" ... ( scrolling down
works fine)

- porting gcc4.x and binutils. ( to build linux 0.01 in linux 0.01 :) )
  
- dietlibc can't be compiled with gcc-4. 
  maybe because I have added malloc function from bash-3.2 


End :
==============

that's all.
Enjoy :)

You have a question ? : mail me draconux@gmail.com
You found a bug/error, in any software/documentation ? : please let me know.