projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| 9c046d96 MT |
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 | Slot injection notification pending. One bit per slot. | |
| 16 | ||
| 17 | Read by ACPI BIOS GPE.1 handler to notify OS of injection | |
| ba737541 | 18 | events. Read-only. |
| 9c046d96 MT |
19 | |
| 20 | PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access): | |
| 21 | ----------------------------------------------------- | |
| 22 | Slot removal notification pending. One bit per slot. | |
| 23 | ||
| 24 | Read by ACPI BIOS GPE.1 handler to notify OS of removal | |
| ba737541 | 25 | events. Read-only. |
| 9c046d96 MT |
26 | |
| 27 | PCI device eject (IO port 0xae08-0xae0b, 4-byte access): | |
| 28 | ---------------------------------------- | |
| 29 | ||
| 9290f364 AW |
30 | Write: Used by ACPI BIOS _EJ0 method to request device removal. |
| 31 | One bit per slot. | |
| 32 | ||
| 33 | Read: Hotplug features register. Used by platform to identify features | |
| 34 | available. 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 | |
| 9c046d96 MT |
40 | |
| 41 | PCI removability status (IO port 0xae0c-0xae0f, 4-byte access): | |
| 42 | ----------------------------------------------- | |
| 43 | ||
| 44 | Used by ACPI BIOS _RMV method to indicate removability status to OS. One | |
| 31745aab | 45 | bit per slot. Read-only |