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flat assembler > OS Construction > int 15h

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bipman



Joined: 07 May 2017
Posts: 2
Location: UK
Hi

Does anyone have a pointer to the BIOS code behind the INT 15h, AX=E820h - Query System Address Map call ? I'm curious to know what it does and can't seem to find the code in the BIOS.

Bipman
Post 07 May 2017, 19:32
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16057
Location: 112 Ocean Avenue, Amityville
Every BIOS is different for each machine make and model.

Options for you would be to boot DOS (or any real mode OS) and examine the BIOS calls in memory with a debugger. Or disassemble your BIOS and try to follow the code paths. The third option of asking the manufacturer for source code is probably the last resort due to the secretive nature they practice.
Post 08 May 2017, 02:54
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rugxulo



Joined: 09 Aug 2005
Posts: 2309
Location: Usono (aka, USA)
Perhaps SeaBIOS?
Post 08 May 2017, 13:23
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bipman



Joined: 07 May 2017
Posts: 2
Location: UK
Looks interesting!
Post 08 May 2017, 17:41
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