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------------------------------------------------------------------------------ 15 16Slot injection notification pending. One bit per slot. 17 18Read by ACPI BIOS GPE.1 handler to notify OS of injection 19events. Read-only. 20 21PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access) 22-------------------------------------------------------------------- 23 24Slot removal notification pending. One bit per slot. 25 26Read by ACPI BIOS GPE.1 handler to notify OS of removal 27events. Read-only. 28 29PCI device eject (IO port 0xae08-0xae0b, 4-byte access) 30------------------------------------------------------- 31 32Write: Used by ACPI BIOS _EJ0 method to request device removal. 33One bit per slot. 34 35Read: Hotplug features register. Used by platform to identify features 36available. Current base feature set (no bits set): 37 38- Read-only "up" register @0xae00, 4-byte access, bit per slot 39- Read-only "down" register @0xae04, 4-byte access, bit per slot 40- Read/write "eject" register @0xae08, 4-byte access, 41 write: bit per slot eject, read: hotplug feature set 42- Read-only hotplug capable register @0xae0c, 4-byte access, bit per slot 43 44PCI removability status (IO port 0xae0c-0xae0f, 4-byte access) 45-------------------------------------------------------------- 46 47Used by ACPI BIOS _RMV method to indicate removability status to OS. One 48bit per slot. Read-only. 49