From 68077ae3383a8da5aae3acc861f20cdf756df544 Mon Sep 17 00:00:00 2001
From: vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 23 Jul 2008 02:54:38 +0000
Subject: add logic to check PCI device has option rom when degrading PCI
 resources. If one device has 64 bit memory bar and option rom bar. Its 64bit
 memory should be degraded to 32bit memory.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5550 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../Bus/Pci/PciBusDxe/PciResourceSupport.c         | 25 +++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

(limited to 'IntelFrameworkModulePkg')

diff --git a/IntelFrameworkModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c b/IntelFrameworkModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
index a827bab097..d8ebadf64b 100644
--- a/IntelFrameworkModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
+++ b/IntelFrameworkModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
@@ -1,6 +1,6 @@
 /**@file
 
-Copyright (c) 2006 - 2007, Intel Corporation
+Copyright (c) 2006 - 2008, Intel Corporation
 All rights reserved. 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
@@ -913,6 +913,25 @@ DegradeResource (
   IN PCI_RESOURCE_NODE *PMem64Node
   )
 {
+  BOOLEAN              HasOprom;
+  PCI_IO_DEVICE        *Temp;
+  LIST_ENTRY           *CurrentLink;
+
+  //
+  // For RootBridge, PPB , P2C, go recursively to traverse all its children
+  // to find if this bridge and downstream has OptionRom.
+  // 
+  HasOprom = FALSE;
+  CurrentLink = Bridge->ChildList.ForwardLink;
+  while (CurrentLink && CurrentLink != &Bridge->ChildList) {
+
+    Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
+    if (Temp->RomSize != 0) {
+      HasOprom = TRUE;
+      break;
+    }    
+    CurrentLink = CurrentLink->ForwardLink;
+  }  
 
   //
   // If bridge doesn't support Prefetchable
@@ -926,9 +945,9 @@ DegradeResource (
       );
   } else {
     //
-    // if no PMem32 request, still keep PMem64. Otherwise degrade to PMem32
+    // if no PMem32 request and no OptionRom request, still keep PMem64. Otherwise degrade to PMem32
     //
-    if (PMem32Node != NULL && PMem32Node->Length != 0 && Bridge->Parent != NULL ) { 
+    if ((PMem32Node != NULL && (PMem32Node->Length != 0 && Bridge->Parent != NULL)) || HasOprom) { 
       //
       // Fixed the issue that there is no resource for 64-bit (above 4G)
       //
-- 
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