Re: Calling BIOS from device driver

Re: Calling BIOS from device driver


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Posted by Sheetal on August 26, 2001 at 23:12:58:

In Reply to: Re: Calling BIOS from device driver posted by Henry on August 23, 2001 at 21:04:52:

: : Hi!!!

: : I am writing a driver for Windows 2000, how do i read BIOS from a driver?? any suggestions r welcome

: : Sheetal
:
:
: Most times BIOS is cached in low memory so it will execute faster - BIOS is fairly slow. SO - just find the starting and ending addresses (memory map in some very technical spec books) and take it from there. I think BIOS functions are invoked (if that is what you want) by calling the Interrupt (say Int 13h or ...) in accordance with the programming language you are using.

: If you are writing your driver to run on your machine as it is now and no other you can probably get away with direct addressing - but if you intend to use it on other machines (with many different BIOS) then you would need to take a much more general approach.

: Drivers are really hard to get RIGHT. Recently I came across some downloadable driver writing tools that are supposed to make make driver writing easier - kinda like templates I think, at:
: http://www.jungo.co.uk/tour.html

: Hope this helps.
: Henry


Hi Henry,

Thanks for the help.....I guess to invoke BIOS functions i will have to get their address..isnt it??? And for that i will have to read BIOS signature..i am writing driver in C. After getting memory address range for BIOS how do i read any BIOS area from my driver?



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