[SeaBIOS] INT 1A - PCI Services supported?

Bob Moore Robert.Moore at hgst.com
Wed Feb 17 00:50:25 CET 2016

Hello again,

I have a need in my option ROM to interrogate devices identified by the BIOS PCI bus enumeration process.  It seems like the most straight forward way to do this would be to use INT 1A assuming seaBios supports PCI 2.0 or later, to search for all instances of devices which I'm interested in.  Can anyone confirm whether seaBios supports PCI 2.0 or later?  I see a hardcoded org at 0xfe6e in romlayout.S that appears to be the entry to that handler.  I've tried using the INT instruction as well as calling directly to 0xf000fe6e.  Direct calls result in KVM crash as below.  I suspect this is due to not using the proper 16/32 bit call interface.  Using INT 1A I don't appear to be going through this code at all.



Running option rom at ca80:0003
KVM internal error. Suberror: 1
emulation failure
EAX=0000b102 EBX=0000ffff ECX=00008547 EDX=000011f8
ESI=00000000 EDI=000058b0 EBP=00000000 ESP=00006e4c
EIP=f000fe6e EFL=00010202 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =f000 000f0000 ffffffff 00809300
CS =ca80 000ca800 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =0000 00000000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     000f59c0 00000037
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
Code=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
qemu: terminating on signal 2

Robert (Bob) L Moore
Firmware Engineer
CIBU Platform
o: 719-799-4642 (ext. 244642)
robert.moore at hgst.com<mailto:robert.moore at hgst.com>

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