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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 | |
18 | events. | |
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 | |
25 | events. | |
26 | ||
27 | PCI device eject (IO port 0xae08-0xae0b, 4-byte access): | |
28 | ---------------------------------------- | |
29 | ||
30 | Used by ACPI BIOS _EJ0 method to request device removal. One bit per slot. | |
31 | Reads return 0. | |
32 | ||
33 | PCI removability status (IO port 0xae0c-0xae0f, 4-byte access): | |
34 | ----------------------------------------------- | |
35 | ||
36 | Used by ACPI BIOS _RMV method to indicate removability status to OS. One | |
37 | bit per slot. |