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Llama Boy



Joined: 24 Jul 2005
Posts: 7
Location: Texas, USA
Llama Boy
ok, i know the input and output using 21h, but i dont want it to rely on dos. can i see the code for platform independant INT 21h (ah=9) and INT 21h (ah=0Ah).
Thanks

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Post 26 Jul 2005, 06:11
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17287
Location: In your JS exploiting you and your system
revolution
There is no platform independent code for outputting text and inputting keystrokes. You can use the bios INT's 10 etc. but they only work in a real mode OS. Protected mode OS's each have their own style of doing IO and you have no choice but to learn for each OS you want to use.

For Linux - INT 80h
For Windows - API's
For DOS - INT 21h
For BIOS - INT 16h and INT 10h
Post 26 Jul 2005, 06:47
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Llama Boy



Joined: 24 Jul 2005
Posts: 7
Location: Texas, USA
Llama Boy
well thanks. also, why are most major OSs protected mode?
Post 26 Jul 2005, 06:52
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17287
Location: In your JS exploiting you and your system
revolution
Quote:
why are most major OSs protected mode?
Multi-tasking, multi-user, more effective use of the CPU resources.

Have a look at the FASM sources, each supported platform has it's own directory and files to allow the basic IO for use by the core.
Post 26 Jul 2005, 07:15
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madmatt



Joined: 07 Oct 2003
Posts: 1045
Location: Michigan, USA
madmatt
Llama boy: protected mode allows access to MUCH more memory, better protection of memory resources, and on new processors, allows you to use hyperthreading for faster process multi-tasking, plus the stuff mentioned above
Post 26 Jul 2005, 08:42
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shaolin007



Joined: 03 Sep 2004
Posts: 65
shaolin007
revolution wrote:
There is no platform independent code for outputting text and inputting keystrokes. You can use the bios INT's 10 etc. but they only work in a real mode OS. Protected mode OS's each have their own style of doing IO and you have no choice but to learn for each OS you want to use.

For Linux - INT 80h
For Windows - API's
For DOS - INT 21h
For BIOS - INT 16h and INT 10h


You could, in real mode that is, write directly to video memory or handle the output by hooking int 09. But why reinvent the wheel unless you have to?
Post 26 Jul 2005, 12:48
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Llama Boy



Joined: 24 Jul 2005
Posts: 7
Location: Texas, USA
Llama Boy
im guessing protected mode os is much harder to write, seeing as how it gets all these awesome features.
Post 27 Jul 2005, 04:48
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smiddy



Joined: 31 Oct 2004
Posts: 559
smiddy
Llama Boy wrote:
im guessing protected mode os is much harder to write, seeing as how it gets all these awesome features.


Nah, it isn't harder. It is more time consuming since there are more opportunities for performance and features. Laughing
Post 27 Jul 2005, 11:41
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