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QEMU<->ACPI BIOS PCI hotplug interface
--------------------------------------
QEMU supports PCI hotplug via ACPI, for PCI bus 0. This document
describes the interface between QEMU and the ACPI BIOS.
ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
-----------------------------------------
Generic ACPI GPE block. Bit 1 (GPE.1) used to notify PCI hotplug/eject
event to ACPI BIOS, via SCI interrupt.
PCI slot injection notification pending (IO port 0xae00-0xae03, 4-byte access):
---------------------------------------------------------------
Slot injection notification pending. One bit per slot.
Read by ACPI BIOS GPE.1 handler to notify OS of injection
events.
PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access):
-----------------------------------------------------
Slot removal notification pending. One bit per slot.
Read by ACPI BIOS GPE.1 handler to notify OS of removal
events.
PCI device eject (IO port 0xae08-0xae0b, 4-byte access):
----------------------------------------
Used by ACPI BIOS _EJ0 method to request device removal. One bit per slot.
Reads return 0.
PCI removability status (IO port 0xae0c-0xae0f, 4-byte access):
-----------------------------------------------
Used by ACPI BIOS _RMV method to indicate removability status to OS. One
bit per slot.
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