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| author | Laszlo Ersek <lersek@redhat.com> | 2015-07-14 12:02:39 +0000 |
|---|---|---|
| committer | lersek <lersek@Edk2> | 2015-07-14 12:02:39 +0000 |
| commit | 5eb0b80afc4185f11379ab317f0b4d1b5520ef96 (patch) | |
| tree | 00330b83c7a697a952a4e69b075dde4b33c50e9d /OvmfPkg/Library/QemuBootOrderLib/ExtraRootBusMap.h | |
| parent | 68306ac2f2e7b85fc0d592248f68679139809b1a (diff) | |
| download | edk2-platforms-5eb0b80afc4185f11379ab317f0b4d1b5520ef96.tar.xz | |
OvmfPkg: QemuBootOrderLib: introduce ExtraRootBusMap
SeaBIOS requires the OpenFirmware device paths exported in the "bootorder"
fw-cfg file to refer to extra (PXB) root buses by their relative positions
(in increasing bus number order) rather than by actual bus numbers.
However, OVMF's PCI host bridge / root bridge driver creates PciRoot(UID)
device path nodes for extra PCI root buses with UID=bus_nr, not position.
(These ACPI devpath UID values must, and do, match the UID values exposed
in QEMU's ACPI payload, generated for PXB root buses.)
Therefore the boot order matching logic will have to map extra root bus
positions to bus numbers. Add a small group of utility functions to help
with that.
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17964 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'OvmfPkg/Library/QemuBootOrderLib/ExtraRootBusMap.h')
| -rw-r--r-- | OvmfPkg/Library/QemuBootOrderLib/ExtraRootBusMap.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/OvmfPkg/Library/QemuBootOrderLib/ExtraRootBusMap.h b/OvmfPkg/Library/QemuBootOrderLib/ExtraRootBusMap.h new file mode 100644 index 0000000000..e2dbc38ed8 --- /dev/null +++ b/OvmfPkg/Library/QemuBootOrderLib/ExtraRootBusMap.h @@ -0,0 +1,40 @@ +/** @file
+ Map positions of extra PCI root buses to bus numbers.
+
+ Copyright (C) 2015, Red Hat, Inc.
+
+ This program and the accompanying materials are licensed and made available
+ under the terms and conditions of the BSD License which accompanies this
+ distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
+ WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+**/
+
+#ifndef __EXTRA_ROOT_BUS_MAP_H__
+#define __EXTRA_ROOT_BUS_MAP_H__
+
+/**
+ Incomplete ("opaque") data type implementing the map.
+**/
+typedef struct EXTRA_ROOT_BUS_MAP_STRUCT EXTRA_ROOT_BUS_MAP;
+
+EFI_STATUS
+CreateExtraRootBusMap (
+ OUT EXTRA_ROOT_BUS_MAP **ExtraRootBusMap
+ );
+
+VOID
+DestroyExtraRootBusMap (
+ IN EXTRA_ROOT_BUS_MAP *ExtraRootBusMap
+ );
+
+EFI_STATUS
+MapRootBusPosToBusNr (
+ IN CONST EXTRA_ROOT_BUS_MAP *ExtraRootBusMap,
+ IN UINT64 RootBusPos,
+ OUT UINT32 *RootBusNr
+ );
+
+#endif
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