[RFC v2 1/6] MdeModulePkg: Add DxeBmDmaLib (BmDmaLib class) library

[Leo Duran <leo.duran@amd.com>]

This patch provides an abstraction layer for Bus-master DMA operations as
currently implemented by the PciHostBridgeDxe driver. The intent is to then
allow override of this library as may be required by specific hardware
implementations, such as AMD's Secure Encrypted Virtualization (SEV).

This new (BmDmaLib class) library is cloned from the existing DmaLib with
an additional DmaAbove4GB (BOOLEAN) parameter for the Map and Allocate
interfaces, so that decisions can be made about the need to allocate DMA
buffers below the 4GB boundary.
---
 MdeModulePkg/MdeModulePkg.dsc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MdeModulePkg/MdeModulePkg.dsc b/MdeModulePkg/MdeModulePkg.dsc
index 5996fe5..311922e 100644
--- a/MdeModulePkg/MdeModulePkg.dsc
+++ b/MdeModulePkg/MdeModulePkg.dsc
@@ -275,6 +275,7 @@ [Components]
   MdeModulePkg/Core/Pei/PeiMain.inf
   MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
 
+  MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
   MdeModulePkg/Library/DxeCapsuleLibNull/DxeCapsuleLibNull.inf
   MdeModulePkg/Library/UefiMemoryAllocationProfileLib/UefiMemoryAllocationProfileLib.inf
   MdeModulePkg/Library/DxeCoreMemoryAllocationLib/DxeCoreMemoryAllocationLib.inf
-- 
1.9.1