Int 1A Fn B101  - Pci Bios V2.0c+ - Installation Check                     [X]

   AX = B101h
   EDI = 00000000h

Return: AH = 00h if installed
       CF clear
       EDX = 20494350h (' ICP')
       EDI = physical address of protected-mode entry point (see #0655)
       AL = PCI hardware characteristics (see #0654)
       BH = PCI interface level major version (BCD)
       BL = PCI interface level minor version (BCD)
       CL = number of last PCI bus in system
   EAX, EBX, ECX, and EDX may be modified
   all other flags (except IF) may be modified

Notes: this function may require up to 1024 byte of stack; it will not enable
     interrupts if they were disabled before making the call
   some BIOSes do not change EDI, so applications looking for the
     protected-mode entry point should set EDI to 00000000h before
     calling this function

See Also: AX=B181h

(Table 0653)
Values for PCI BIOS v2.0c+ status codes:
 00h   successful
 81h   unsupported function
 83h   bad vendor ID
 86h   device not found
 87h   bad PCI register number

Bitfields for PCI hardware characteristics:
Bit(s) Description (Table 0654)
 0 configuration space access mechanism 1 supported
 1 configuration space access mechanism 2 supported
 2-3   reserved
 4 Special Cycle generation mechanism 1 supported
 5 Special Cycle generation mechanism 2 supported
 6-7   reserved

(Table 0655)
Call protected-mode entry point with:
   registers as for real/V86-mode INT call
   CS = ring 0 descriptor with access to full address space

Return: as for real/V86-mode call