int 15h

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bipman

Joined: 07 May 2017
Posts: 2
Location: UK

bipman 07 May 2017, 19:32

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

07 May 2017, 19:32

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20423
Location: In your JS exploiting you and your system

revolution 08 May 2017, 02:54

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.

08 May 2017, 02:54

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 08 May 2017, 13:23

Perhaps SeaBIOS?

08 May 2017, 13:23

bipman

Joined: 07 May 2017
Posts: 2
Location: UK

bipman 08 May 2017, 17:41

Looks interesting!

08 May 2017, 17:41

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