Coreboot and INT13H

Hello everybody,

i'm interesting in the way Coreboot manages the INT13H interrupt.

Please, can you tell me:

1- where (the name of the file) the INT 13H is implemented in the coreboot source code ?
2- if the INT 13H interrupt, when invoked by OS (or application programs), can do writing operations in the filesystem of the drive attached to the PC or only limits  to writing operations in memory regions different by the filesystem ?

3- Is a way to see on the screen the fully sequence of operations coreboot execute during the boot ? (i don't use QUEMU but program directly the bios eeprom chip).

Best Regards.

Vincenzo.

Forensic Consultant
Tribunale di Lecce

Studio: Strada di Garibaldi - Contrada Paradisi
73010 Lequile (LE)

cell: 339.7968555
skype: vincenzo.di_salvo

[Patrick Georgi]

2017-07-19 23:24 GMT+02:00 [e-mail] <
[e-mail]>:
> 1- where (the name of the file) the INT 13H is implemented in the coreboot
> source code ?

It's not. coreboot doesn't provide BIOS services. For those, see seabios (
www.seabios.org)
> 2- if the INT 13H interrupt, when invoked by OS (or application programs),
> can do writing operations in the filesystem of the drive attached to the PC
> or only limits  to writing operations in memory regions different by the
> filesystem ?

Not applicable

3- Is a way to see on the screen the fully sequence of operations coreboot
> execute during the boot ? (i don't use QUEMU but program directly the bios
> eeprom chip).

coreboot boots too fast for any meaningful screen output so we dropped
support for that years ago.
There's a log in memory (cbmem -c) or on serial, if configured.

Patrick