BIOS Interrupt

wwnn1 · 05-17-2002, 10:05 AM

In dos,we can call BIOS Interrupt by using some function like this:
/***********************
int86(21H,0AH); or
int(....);
***********************/

How can I call BIOS Interrupt function in linux or gcc?

Mara · 05-17-2002, 03:47 PM

If it's BIOS interrupt, it's the same way. But you need assembler compiler (should be in your distro). It's different with system interrupts, of course.

95se · 05-17-2002, 09:54 PM

__asm__ anyone?

crabboy · 05-17-2002, 11:42 PM

The kernel source has a ton of asm code you could use as an example. I think that cc will compile it for you. It just needs a .S extension.

Code:

find /usr/src/linux -name '*.S' -type f -exec frep "BIOS" {} /dev/null \;

wwnn1 · 05-18-2002, 02:30 AM

I am sorry that I did not tell you clearly.
I mean that how can I call BIOS interrupt in C language?

of course,the assembler compiler will do that.
but, I want to accomplish the function In C.

llama_meme · 05-18-2002, 06:46 AM

isn't it a bad idea to make a BIOS call from linux? (seeing as the kernel ignores the BIOS completely)

sourceman · 05-21-2002, 04:08 AM

But listen now...

In your first example...
int86(21H,0AH);
This is not a BIOS call. Int 21h is DOS.
You won't get any DOS interrupts in Linux.

Also...

Linux is protected mode. You cannot call interrupts in protected mode. You have to use the protected modde interface.

The linux kernel provides Int 0x80, where most common calls can be found like fork, exec, open close, read etc.
You can get a list of linux system calls from...
www.lxhp.in-berlin.de/lhpsysc0.html

Mik · 05-21-2002, 06:59 AM

Go to http://www.linuxassembly.org there is lots of documentation and tutorials there on how to run assembly code from c programs.

wwnn1 · 05-23-2002, 06:00 AM

Thanks all !

*^_^*