CODEWITHSUNDEEP
assemblyiohardwareprivileges
Barak
Barak

Reputation: 143

Assembly - Privilege Levels

How can I perform restricted instructions such as IN and OUT from protected mode?

I've found out that It would require privilege level (CPL) high enough to perform the IO instruction. How can I run in kernel mode, have IO permission or anything other that may help me? - I would like to have direct access to hardware, without anything blocking me.

Thanks.

Upvotes: 3

Views: 702

Answers (1)

vbence
vbence

Reputation: 20333

DOS is not a protected mode OS. In the olden days there were PM frameworks called DOS extenders. They have an API for things like this. Creating your own PM environment consists of much more than just switching the CPU to Protected Mode.

You should also use a debugger program to check what exactly is wrong under DosBox.

Upvotes: 1

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