From 55cdb67acb3df840c1d3bbf0e0e78fba27dcfbe3 Mon Sep 17 00:00:00 2001
From: jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 13 Oct 2010 07:07:29 +0000
Subject: OVMF: Support greater than 2GB of memory

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10928 6f19259b-4bc3-4df7-8a09-765794883524
---
 OvmfPkg/PlatformPei/MemDetect.c |  6 +++---
 OvmfPkg/PlatformPei/Platform.c  | 23 +++++++++++++++--------
 OvmfPkg/PlatformPei/Platform.h  |  2 +-
 3 files changed, 19 insertions(+), 12 deletions(-)

(limited to 'OvmfPkg')

diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 5e09cc9375..9a82cc79d0 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -54,7 +54,7 @@ GetSystemMemorySize (
   Cmos0x34 = (UINT8) CmosRead8 (0x34);
   Cmos0x35 = (UINT8) CmosRead8 (0x35);
 
-  return ((((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB);
+  return (((UINTN)((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB);
 }
 
 
@@ -64,7 +64,7 @@ GetSystemMemorySize (
   @return EFI_SUCCESS     The PEIM initialized successfully.
 
 **/
-EFI_STATUS
+EFI_PHYSICAL_ADDRESS
 MemDetect (
   )
 {
@@ -103,6 +103,6 @@ MemDetect (
   AddMemoryRangeHob (BASE_1MB, MemoryBase);
   AddMemoryRangeHob (0, BASE_512KB + BASE_128KB);
 
-  return EFI_SUCCESS;
+  return MemoryBase + MemorySize;
 }
 
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index d35a1fbb5c..c379f88b4d 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -35,7 +35,7 @@
 EFI_MEMORY_TYPE_INFORMATION mDefaultMemoryTypeInformation[] = {
   { EfiACPIMemoryNVS,       0x004 },
   { EfiACPIReclaimMemory,   0x008 },
-  { EfiReservedMemoryType,  0x004 },     
+  { EfiReservedMemoryType,  0x004 },
   { EfiRuntimeServicesData, 0x024 },
   { EfiRuntimeServicesCode, 0x030 },
   { EfiBootServicesCode,    0x180 },
@@ -104,6 +104,7 @@ AddMemoryRangeHob (
 
 VOID
 MemMapInitialization (
+  EFI_PHYSICAL_ADDRESS  TopOfMemory
   )
 {
   //
@@ -129,22 +130,26 @@ MemMapInitialization (
   //
   // Add PCI MMIO space available to PCI resource allocations
   //
-  AddIoMemoryBaseSizeHob (0x80000000, 0xFEC00000 - 0x80000000);
+  if (TopOfMemory < BASE_2GB) {
+    AddIoMemoryBaseSizeHob (BASE_2GB, 0xFEC00000 - BASE_2GB);
+  } else {
+    AddIoMemoryBaseSizeHob (TopOfMemory, 0xFEC00000 - TopOfMemory);
+  }
 
   //
   // Local APIC range
   //
-  AddIoMemoryBaseSizeHob (0xFEC80000, 0x80000);
+  AddIoMemoryBaseSizeHob (0xFEC80000, SIZE_512KB);
 
   //
   // I/O APIC range
   //
-  AddIoMemoryBaseSizeHob (0xFEC00000, 0x80000);
+  AddIoMemoryBaseSizeHob (0xFEC00000, SIZE_512KB);
 
   //
   // Video memory + Legacy BIOS region
   //
-  AddIoMemoryRangeHob (0x0A0000, 0x100000);
+  AddIoMemoryRangeHob (0x0A0000, BASE_1MB);
 }
 
 
@@ -155,7 +160,7 @@ MiscInitialization (
   //
   // Disable A20 Mask
   //
-  IoWrite8 (0x92, (UINT8) (IoRead8 (0x92) | 0x02));
+  IoOr8 (0x92, BIT1);
 
   //
   // Build the CPU hob with 36-bit addressing and 16-bits of IO space.
@@ -206,15 +211,17 @@ InitializePlatform (
   IN CONST EFI_PEI_SERVICES     **PeiServices
   )
 {
+  EFI_PHYSICAL_ADDRESS  TopOfMemory;
+
   DEBUG ((EFI_D_ERROR, "Platform PEIM Loaded\n"));
 
-  MemDetect ();
+  TopOfMemory = MemDetect ();
 
   ReserveEmuVariableNvStore ();
 
   PeiFvInitialization ();
 
-  MemMapInitialization ();
+  MemMapInitialization (TopOfMemory);
 
   MiscInitialization ();
 
diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.h
index 53090ac2c7..0829f89d3b 100644
--- a/OvmfPkg/PlatformPei/Platform.h
+++ b/OvmfPkg/PlatformPei/Platform.h
@@ -39,7 +39,7 @@ AddMemoryRangeHob (
   EFI_PHYSICAL_ADDRESS        MemoryLimit
   );
 
-EFI_STATUS
+EFI_PHYSICAL_ADDRESS
 MemDetect (
   VOID
   );
-- 
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