[edk2-devel] [Patch v2 1/2] MdeModulePkg/Core/Dxe: Initialize GCD before RT memory allocations

["Michael D Kinney" <michael.d.kinney@intel.com>]

Update the DxeMain initialization order to initialize GCD
services before any runtime allocations are performed.  This
is required to prevent runtime data fragmentation when the
UEFI System Table and UEFI Runtime Service Table are allocated
before both the memory and GCD services are initialized.

Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Aaron Li <aaron.li@intel.com>
Cc: Liu Yun <yun.y.liu@intel.com>
Cc: Andrew Fish <afish@apple.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
---
 MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c | 23 ++++++++++++++---------
 MdeModulePkg/Core/Dxe/Image/Image.c     |  1 -
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
index 0e0f9769b99d..17d510a287e5 100644
--- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
+++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
@@ -276,6 +276,18 @@ DxeMain (
 
   MemoryProfileInit (HobStart);
 
+  //
+  // Start the Image Services.
+  //
+  Status = CoreInitializeImageServices (HobStart);
+  ASSERT_EFI_ERROR (Status);
+
+  //
+  // Initialize the Global Coherency Domain Services
+  //
+  Status = CoreInitializeGcdServices (&HobStart, MemoryBaseAddress, MemoryLength);
+  ASSERT_EFI_ERROR (Status);
+
   //
   // Allocate the EFI System Table and EFI Runtime Service Table from EfiRuntimeServicesData
   // Use the templates to initialize the contents of the EFI System Table and EFI Runtime Services Table
@@ -289,16 +301,9 @@ DxeMain (
   gDxeCoreST->RuntimeServices = gDxeCoreRT;
 
   //
-  // Start the Image Services.
+  // Update DXE Core Loaded Image Protocol with allocated UEFI System Table
   //
-  Status = CoreInitializeImageServices (HobStart);
-  ASSERT_EFI_ERROR (Status);
-
-  //
-  // Initialize the Global Coherency Domain Services
-  //
-  Status = CoreInitializeGcdServices (&HobStart, MemoryBaseAddress, MemoryLength);
-  ASSERT_EFI_ERROR (Status);
+  gDxeCoreLoadedImage->SystemTable = gDxeCoreST;
 
   //
   // Call constructor for all libraries
diff --git a/MdeModulePkg/Core/Dxe/Image/Image.c b/MdeModulePkg/Core/Dxe/Image/Image.c
index 6bc3a549ae5e..3fc74eb9fd6b 100644
--- a/MdeModulePkg/Core/Dxe/Image/Image.c
+++ b/MdeModulePkg/Core/Dxe/Image/Image.c
@@ -222,7 +222,6 @@ CoreInitializeImageServices (
   Image->ImageBasePage    = DxeCoreImageBaseAddress;
   Image->NumberOfPages    = (UINTN)(EFI_SIZE_TO_PAGES ((UINTN)(DxeCoreImageLength)));
   Image->Tpl              = gEfiCurrentTpl;
-  Image->Info.SystemTable = gDxeCoreST;
   Image->Info.ImageBase   = (VOID *)(UINTN)DxeCoreImageBaseAddress;
   Image->Info.ImageSize   = DxeCoreImageLength;
 
-- 
2.40.1.windows.1



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