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Index > OS Construction > MultiTasking

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joachim_neu



Joined: 22 Dec 2003
Posts: 139
joachim_neu
hello,

has anyone implemented multitasking yet? how? i'm in FRM, so i can't use TSS. and now i'm searching an other method. my idea is, to set up a table in the memory, where the ss and sp and some other thing is saved, and then set up the int 0x08 software (0x00 hardware) to save the current values to the stack, go to the next entry, load ss and sp and then return to the programm. i've implemented it yet, but it only runs, if there's only the kernel-task. whenever i start a new task, it crashs. i think it's because the stack hasn't the return-adress. when the kernel-task stops, the interrupts goes to the next entry, but on the stack are no values, and so it jumps by iret into 0x0000:0x0000. and now i'd like to ask somethings:
1.: if the interrupt starts, it saves first the flags, then the segment and then the offset, right?
2.: how did you do this? have you an other idea?

mfg

JN!
Post 11 Dec 2004, 10:43
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ASHLEY4



Joined: 28 Apr 2004
Posts: 376
Location: UK
ASHLEY4
Take a look at the 512b compo winner, full multitasking in 512 bytes, may help ?.
http://512.decard.net/entries/
Its called "nanoos2.zip".

\\\\||////
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ASHLEY4.

Batteries not included, Some assembly required.
Post 11 Dec 2004, 16:30
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joachim_neu



Joined: 22 Dec 2003
Posts: 139
joachim_neu
is it also in FRM?
Post 11 Dec 2004, 21:16
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ASHLEY4



Joined: 28 Apr 2004
Posts: 376
Location: UK
ASHLEY4
Realmode i think.

\\\\||////
(@@)
ASHLEY4.

Batteries not included, Some assembly required.
Post 11 Dec 2004, 23:59
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joachim_neu



Joined: 22 Dec 2003
Posts: 139
joachim_neu
ok... i'll have a big look at it. but till now i didn't find the special code-part. who is the coder?
Post 12 Dec 2004, 11:24
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ASHLEY4



Joined: 28 Apr 2004
Posts: 376
Location: UK
ASHLEY4
KVP, he's usually on here: http://groups-beta.google.com/group/alt.os.development

\\\\||////
(@@)
ASHLEY4.

Batteries not included, Some assembly required.
Post 12 Dec 2004, 15:04
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