aboutsummaryrefslogtreecommitdiff
path: root/docs/specs
diff options
context:
space:
mode:
authorMarcelo Tosatti <mtosatti@redhat.com>2011-01-11 14:20:38 -0200
committerMichael S. Tsirkin <mst@redhat.com>2011-01-17 17:29:42 +0200
commit9c046d96d4d0d1fef89a30b1491775492082da9d (patch)
tree5b94325a6c690c1a9c22dbf80e5e2a56e2a1769c /docs/specs
parenta01a9cb821a29852abb142ec52b26c8488ced6e8 (diff)
downloadqemu-9c046d96d4d0d1fef89a30b1491775492082da9d.zip
qemu-9c046d96d4d0d1fef89a30b1491775492082da9d.tar.gz
qemu-9c046d96d4d0d1fef89a30b1491775492082da9d.tar.bz2
document QEMU<->ACPIBIOS PCI hotplug interface
Document how QEMU communicates with ACPI BIOS for PCI hotplug. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'docs/specs')
-rw-r--r--docs/specs/acpi_pci_hotplug.txt37
1 files changed, 37 insertions, 0 deletions
diff --git a/docs/specs/acpi_pci_hotplug.txt b/docs/specs/acpi_pci_hotplug.txt
new file mode 100644
index 0000000..f0f74a7
--- /dev/null
+++ b/docs/specs/acpi_pci_hotplug.txt
@@ -0,0 +1,37 @@
+QEMU<->ACPI BIOS PCI hotplug interface
+--------------------------------------
+
+QEMU supports PCI hotplug via ACPI, for PCI bus 0. This document
+describes the interface between QEMU and the ACPI BIOS.
+
+ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
+-----------------------------------------
+
+Generic ACPI GPE block. Bit 1 (GPE.1) used to notify PCI hotplug/eject
+event to ACPI BIOS, via SCI interrupt.
+
+PCI slot injection notification pending (IO port 0xae00-0xae03, 4-byte access):
+---------------------------------------------------------------
+Slot injection notification pending. One bit per slot.
+
+Read by ACPI BIOS GPE.1 handler to notify OS of injection
+events.
+
+PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access):
+-----------------------------------------------------
+Slot removal notification pending. One bit per slot.
+
+Read by ACPI BIOS GPE.1 handler to notify OS of removal
+events.
+
+PCI device eject (IO port 0xae08-0xae0b, 4-byte access):
+----------------------------------------
+
+Used by ACPI BIOS _EJ0 method to request device removal. One bit per slot.
+Reads return 0.
+
+PCI removability status (IO port 0xae0c-0xae0f, 4-byte access):
+-----------------------------------------------
+
+Used by ACPI BIOS _RMV method to indicate removability status to OS. One
+bit per slot.