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| author | Wei Liu <wei.liu2@citrix.com> | 2013-12-08 01:35:32 +0000 |
|---|---|---|
| committer | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-12-08 01:35:32 +0000 |
| commit | 5624a27ddebc154ac467b86225a2cab913567dc7 (patch) | |
| tree | 5e5e0d1bb91174fa77710f2ee4ea523e34497b3d /MdeModulePkg | |
| parent | 7cf1a5b328655f59ceca3ecc487baffdd116f571 (diff) | |
| download | edk2-platforms-5624a27ddebc154ac467b86225a2cab913567dc7.tar.xz | |
MdeModulePkg: introduce PcdPciDisableBusEnumeration
Platforms such as Xen already enumerates PCI bridges and devices. Use
this PCD to control EDK2 behavior.
PcdPciDisableBusEnumeration is placed under [PcdsFixedAtBuild,
PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx], so that it is
possible to alter it during runtime.
The default setting of this PCD is false (allow full PCI enumeration) to
preserve the same behavior before this change.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14940 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg')
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c | 6 | ||||
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf | 1 | ||||
| -rw-r--r-- | MdeModulePkg/MdeModulePkg.dec | 3 |
3 files changed, 9 insertions, 1 deletions
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c index 5afbb82298..2252235bce 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c @@ -284,7 +284,11 @@ PciBusDriverBindingStart ( );
}
- gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));
+ if (PcdGetBool (PcdPciDisableBusEnumeration)) {
+ gFullEnumeration = FALSE;
+ } else {
+ gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));
+ }
//
// Open Device Path Protocol for PCI root bridge
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf index 34eb672df1..917889ca0a 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf @@ -108,6 +108,7 @@ gEfiMdeModulePkgTokenSpaceGuid.PcdSrIovSupport
gEfiMdeModulePkgTokenSpaceGuid.PcdAriSupport
gEfiMdeModulePkgTokenSpaceGuid.PcdMrIovSupport
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
# [Event]
# ##
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index b627eb101c..51984510d6 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -878,6 +878,9 @@ ## This PCD specified whether the S.M.A.R.T feature of attached ATA hard disks are enabled.
gEfiMdeModulePkgTokenSpaceGuid.PcdAtaSmartEnable|TRUE|BOOLEAN|0x00010065
+ ## This PCD specifies whether full PCI enumeration is disabled.
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration|FALSE|BOOLEAN|0x10000048
+
[PcdsPatchableInModule]
## Specify memory size with page number for PEI code when
# the feature of Loading Module at Fixed Address is enabled
|