qemu

FORK: QEMU emulator
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acpi_pci_hotplug.rst (1842B)

      1 QEMU<->ACPI BIOS PCI hotplug interface
      2 ======================================
      3 
      4 QEMU supports PCI hotplug via ACPI, for PCI bus 0. This document
      5 describes the interface between QEMU and the ACPI BIOS.
      6 
      7 ACPI GPE block (IO ports 0xafe0-0xafe3, byte access)
      8 ----------------------------------------------------
      9 
     10 Generic ACPI GPE block. Bit 1 (GPE.1) used to notify PCI hotplug/eject
     11 event to ACPI BIOS, via SCI interrupt.
     12 
     13 PCI slot injection notification pending (IO port 0xae00-0xae03, 4-byte access)
     14 ------------------------------------------------------------------------------
     15 
     16 Slot injection notification pending. One bit per slot.
     17 
     18 Read by ACPI BIOS GPE.1 handler to notify OS of injection
     19 events.  Read-only.
     20 
     21 PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access)
     22 --------------------------------------------------------------------
     23 
     24 Slot removal notification pending. One bit per slot.
     25 
     26 Read by ACPI BIOS GPE.1 handler to notify OS of removal
     27 events.  Read-only.
     28 
     29 PCI device eject (IO port 0xae08-0xae0b, 4-byte access)
     30 -------------------------------------------------------
     31 
     32 Write: Used by ACPI BIOS _EJ0 method to request device removal.
     33 One bit per slot.
     34 
     35 Read: Hotplug features register.  Used by platform to identify features
     36 available.  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 
     44 PCI removability status (IO port 0xae0c-0xae0f, 4-byte access)
     45 --------------------------------------------------------------
     46 
     47 Used by ACPI BIOS _RMV method to indicate removability status to OS. One
     48 bit per slot.  Read-only.