Timers?

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Geek

Joined: 01 Jun 2005
Posts: 26

Geek 18 Sep 2005, 19:19

I have been looking for a way to implement multitasking in my OS.

My question is,

How do I setup a timed interupt to stop execution of the current task in order to task swich?

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18 Sep 2005, 19:19

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 18 Sep 2005, 21:12

there is a timer interrupt generated by APIC

18 Sep 2005, 21:12

f0dder

Joined: 19 Feb 2004
Posts: 3175
Location: Denmark

f0dder 19 Sep 2005, 08:43

The standard and "failsafe" method is to use the Programmable Interrupt Timer. As comrade mentioned, newer systems have the APIC stuff.

19 Sep 2005, 08:43

Geek

Joined: 01 Jun 2005
Posts: 26

Geek 19 Sep 2005, 14:43

Thanks very much.

But I am still in the dark.

Would someone please show me how to setup the Programmable interrupt timer. I dont no ware to start.

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Death is not the opposite of life, rather, it is the absence of it.

19 Sep 2005, 14:43

smiddy

Joined: 31 Oct 2004
Posts: 557

smiddy 20 Sep 2005, 10:30

Look up the 8253 or 8254 chip and read the datasheet. The data sheet will explain how to program it. Here's a link: http://www.osdever.net/documents/8253.pdf?the_id=42

20 Sep 2005, 10:30

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