Int 1A/AX=B101h

INT 1A - PCI BIOS v2.0c+ - INSTALLATION CHECK
AX = B101h
EDI = 00000000h

Return:
AH = 00h if installed
CF clear
EDX = 20494350h (' ICP')
EDI = physical address of protected-mode entry point (see #00731)
AL = PCI hardware characteristics (see #00730)
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 00729) 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 00730) 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 00731) 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

Category: Expansion Bus Bios - Int 1Ah - @

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