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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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