1QEMU<->ACPI BIOS PCI hotplug interface 2-------------------------------------- 3 4QEMU supports PCI hotplug via ACPI, for PCI bus 0. This document 5describes the interface between QEMU and the ACPI BIOS. 6 7ACPI GPE block (IO ports 0xafe0-0xafe3, byte access): 8----------------------------------------- 9 10Generic ACPI GPE block. Bit 1 (GPE.1) used to notify PCI hotplug/eject 11event to ACPI BIOS, via SCI interrupt. 12 13PCI slot injection notification pending (IO port 0xae00-0xae03, 4-byte access): 14--------------------------------------------------------------- 15Slot injection notification pending. One bit per slot. 16 17Read by ACPI BIOS GPE.1 handler to notify OS of injection 18events. Read-only. 19 20PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access): 21----------------------------------------------------- 22Slot removal notification pending. One bit per slot. 23 24Read by ACPI BIOS GPE.1 handler to notify OS of removal 25events. Read-only. 26 27PCI device eject (IO port 0xae08-0xae0b, 4-byte access): 28---------------------------------------- 29 30Write: Used by ACPI BIOS _EJ0 method to request device removal. 31One bit per slot. 32 33Read: Hotplug features register. Used by platform to identify features 34available. Current base feature set (no bits set): 35 - Read-only "up" register @0xae00, 4-byte access, bit per slot 36 - Read-only "down" register @0xae04, 4-byte access, bit per slot 37 - Read/write "eject" register @0xae08, 4-byte access, 38 write: bit per slot eject, read: hotplug feature set 39 - Read-only hotplug capable register @0xae0c, 4-byte access, bit per slot 40 41PCI removability status (IO port 0xae0c-0xae0f, 4-byte access): 42----------------------------------------------- 43 44Used by ACPI BIOS _RMV method to indicate removability status to OS. One 45bit per slot. Read-only 46