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46 lines
1.7 KiB
Plaintext
46 lines
1.7 KiB
Plaintext
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QEMU<->ACPI BIOS PCI hotplug interface
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--------------------------------------
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QEMU supports PCI hotplug via ACPI, for PCI bus 0. This document
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describes the interface between QEMU and the ACPI BIOS.
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ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
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-----------------------------------------
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Generic ACPI GPE block. Bit 1 (GPE.1) used to notify PCI hotplug/eject
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event to ACPI BIOS, via SCI interrupt.
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PCI slot injection notification pending (IO port 0xae00-0xae03, 4-byte access):
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---------------------------------------------------------------
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Slot injection notification pending. One bit per slot.
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Read by ACPI BIOS GPE.1 handler to notify OS of injection
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events. Read-only.
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PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access):
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-----------------------------------------------------
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Slot removal notification pending. One bit per slot.
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Read by ACPI BIOS GPE.1 handler to notify OS of removal
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events. Read-only.
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PCI device eject (IO port 0xae08-0xae0b, 4-byte access):
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----------------------------------------
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Write: Used by ACPI BIOS _EJ0 method to request device removal.
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One bit per slot.
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Read: Hotplug features register. Used by platform to identify features
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available. Current base feature set (no bits set):
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- Read-only "up" register @0xae00, 4-byte access, bit per slot
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- Read-only "down" register @0xae04, 4-byte access, bit per slot
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- Read/write "eject" register @0xae08, 4-byte access,
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write: bit per slot eject, read: hotplug feature set
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- Read-only hotplug capable register @0xae0c, 4-byte access, bit per slot
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PCI removability status (IO port 0xae0c-0xae0f, 4-byte access):
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-----------------------------------------------
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Used by ACPI BIOS _RMV method to indicate removability status to OS. One
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bit per slot. Read-only
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