Just an Idea

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Jason

Just an Idea

Post by Jason »

My O.S. doesn't uses virtual memory, but I would like to use the pageing hardware on the x86 to give each application one long spread of memory (only within physical limitaions of course). I understand the mechanics of this (thanks to the intel manuals), but there is one thing I'am getting stumped on.
My O.S. I uses call gates to enter the O.S. would I have to turn off pageing as I don't want my O.S. to be part of the pageing mechanisum.
The O.S. resides in the first 1mb, with the rest being set aside for application use.

Thanks for any help :)
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Brendan
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Re:Just an Idea

Post by Brendan »

Jason wrote: My O.S. I uses call gates to enter the O.S. would I have to turn off pageing as I don't want my O.S. to be part of the pageing mechanisum.
The O.S. resides in the first 1mb, with the rest being set aside for application use.
You could "identity map" the first 1 Mb of memory, so that the first 1 Mb of every address space is the same as physical memory. That way your call gates will still work.

Cheers,

Brendan
For all things; perfection is, and will always remain, impossible to achieve in practice. However; by striving for perfection we create things that are as perfect as practically possible. Let the pursuit of perfection be our guide.
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Jason

Re:Just an Idea

Post by Jason »

Thanks for the help :)
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