Bios interrupts

Bios interrupts

[Electroniks New]

Hi,
  1) i don't exactly understand the ports (Bios data).
   I also understand that linux does override the bios
   functions so that more functionality is acheived.

  2) Can you send the standard ports for use and i may
later use inb and 
     oub on  those ports for data exchange.
 
  3) Also what does jmp short $+2 instruction do ?How
can i change it into   AT&T syntax or inline assembly
? Also what does instruction "in al,64h" do .
   I found these on the net.They are dos code i
assume. Is "in" same as mov .
   If not how do they differ ?  The article was named
Enabling the A20 line.
  (never mind the article).
   It somewhere says enable  .
   Any idea where can i change into AT&T syntax.It is
in Intel syntax. 
  Any idea of sleep instruction in assembly. I tried
but couldn't find .
    I tried a couple of jmps but it never slows down
.How to make the pc sleep 
    (asm instruction for sleep (CPU idle).I put 16000
jmps loops but didn't 
    slow down a bit . 
 
  4) If possible please explain how to use keyboard in
a similar manner.
   (If time permits then simple mouse code).
  
   5)I don't understand the keyboard interrupts 0x64 ,
mouse 0x33 and in some 
    sites  i see the keyboard controllers as 0x64
where as in some sites the 
     code contains  0x10.So what should i use in my
program.
 
  6) Is there any documentation for these ports to
read and write data.


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Re: Bios interrupts

[Richard B. Johnson]

On Tue, 21 Jan 2003, Electroniks New wrote:

> Hi,
>   1) i don't exactly understand the ports (Bios data).
>    I also understand that linux does override the bios
>    functions so that more functionality is acheived.
> 
>   2) Can you send the standard ports for use and i may
> later use inb and 
>      oub on  those ports for data exchange.
>
>   3) Also what does jmp short $+2 instruction do ?How
> can i change it into   AT&T syntax or inline assembly
> ? Also what does instruction "in al,64h" do .
>    I found these on the net.They are dos code i
> assume. Is "in" same as mov .
[SNIPPED...]

Linux is an operating system that does all that stuff for you.
In fact, it prevents user code from touching hardware ar all.
If you learn the Unix/Posix stuff, you will never have to play
with assembly language again.

Linux operates all of the standard PC hardware in a standard
way that allows programs to use open()/close()/read()/write()/
and ioctl() to "talk" to hardware in a standard high-efficiency
way. If you have additional hardware that Linux doesn't "know"
about, then you can write a device-driver (module) for it.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
Why is the government concerned about the lunatic fringe? Think about it.