Well, I was able to verify the presence of PCI-BIOS easily with debug (under
Qemu):
-a 100
mov ax,b101
sub di,di
int 1a
int 20
g=100 107
AH=00 PCIBIOS present
AL=01 configuration space access mechanism 1 supported
BX=0210 version 2.1 supported
EDX = 20494350h (' ICP') (well I only see 4350 because debug use only 16 bits
registers
If you want to search a specific class devices you may fine the Class table
useful at:
https://wiki.osdev.org/PCI#Common_Header_Fields
But should use some 'real' assemblers with 32 bits registers.
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