Problem with far jump ptr16:32 and data descriptor in GDT

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startrail
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Joined: Tue Jan 05, 2016 9:10 am

Re: Problem with far jump ptr16:32 and data descriptor in GD

Post by startrail »

Setting the Cr0.PE bit before changing the selectors makes it work now. Thanks for the help Gigasoft.
Was able to write to the video memory in32 bit mode successfully.

Now I am planning to write an ISO CD reader so that I can locate my kernel and other modules and get to coding in C.
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ggodw000
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Re: Problem with far jump ptr16:32 and data descriptor in GD

Post by ggodw000 »

looks like misread, you loaded segment selectors before PE bit, i'd not do it.
key takeaway after spending yrs on sw industry: big issue small because everyone jumps on it and fixes it. small issue is big since everyone ignores and it causes catastrophy later. #devilisinthedetails
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