help with hardware multitasking

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aks

help with hardware multitasking

Post by aks »

i am testing the working of hardware multitasking for my os.i have made the gdt entries and reserved the space for the tss's.so currently i have 2 tss's.the first tss's gdt selector is used by the ltr statement. now when i try to switch the task to the other tss selector the system restarts.(no interrupt is generated.also i am using vmware.the virtual machine says that there is a problem with the stack).plz help.also could anyone plz giveme some example to demonstrate the h/w multitasking.
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TheUbu

RE:help with hardware multitasking

Post by TheUbu »

aks,

Are you sure the TSS are initialized properly? Correct SS,CS,ES,EBP,ESP and so on? Also you do not need multiple TSS segments you can unset the busy bit and re-initialize the TSS and jump back to it. If you could paste your code that initializes the TSS I can better help you or if you are totally confused I have some documents and sample code I can send your way.



-Christopher
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