froom assembly to C in boot code

froom assembly to C in boot code

[Koala GNU]

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Hi all,

I forward to the lkml a mail I posted on kernelnewbies hoping someone of 
you can help me.
-------------------------------------------------------------------------------------------------------------------------

Hi,

for a couple of weeks I worked on some examples about boot process. In 
my previous post on kernelnewbies I post some of them.

Now I have a problem. My goal is to boot from a diskette, load the setup 
code (4 sectors), load the kernel at 0x10000 and move it at 0x1000 
trying to execute a main C routine that
should represent the start of the kernel. This C routine print simply 
"Hello Kernel".

For my job I used the examples of Berlin Brown at 
http://bama.ua.edu/~brown084/main.html  because this code is a 
simplified version of the linux boot process.

Attached there is my code, hoping someone of you can give a look at it 
and tell me if there is something wrong (I think so).

Before the jump to 0x0100 all seems work fine. The problem happen when I switch in 
protected mode and try to jump to 0x0100.

Ahhhh!!! I use bochs for my test.


PS

To build my code type:

make clean (when necessary)
make all

to write on a diskette:
make disk




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Re: froom assembly to C in boot code

[Gianni Tedesco]

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On Fri, 2003-07-25 at 19:05, Koala GNU wrote:
> Hi all,
> 
> I forward to the lkml a mail I posted on kernelnewbies hoping someone of 
> you can help me.
> -------------------------------------------------------------------------------------------------------------------------

Try post on alt.os.development they are usually a useful crowd for this
kind of thing.

PS. If you want to write your own kernel, you are probably best making a
multiboot kernel that can be loaded by grub. Saves a lot of heartache...

-- 
// Gianni Tedesco (gianni at scaramanga dot co dot uk)
lynx --source www.scaramanga.co.uk/gianni-at-ecsc.asc | gpg --import
8646BE7D: 6D9F 2287 870E A2C9 8F60 3A3C 91B5 7669 8646 BE7D


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