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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
This commit is contained in:
Wei Liu 2013-12-08 01:35:32 +00:00 committed by jljusten
parent 7cf1a5b328
commit 5624a27dde
3 changed files with 9 additions and 1 deletions
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6
MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
View File

@ -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

1
MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
View File

@ -108,6 +108,7 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdSrIovSupport
gEfiMdeModulePkgTokenSpaceGuid.PcdAriSupport
gEfiMdeModulePkgTokenSpaceGuid.PcdMrIovSupport
gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
# [Event]
# ##

3
MdeModulePkg/MdeModulePkg.dec
View File

@ -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