This series 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).

Please refer to the RFC discussion for SEV here:
http://marc.info/?l=linux-mm&m=147190814023863&w=2
    
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.

NOTE: The abstraction layer is intended for Bus-master (DMA capable)
devices, and not restricted to the PCI Root-Bridge use-case. Thus the
rationale for not using EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION types.

Changes since RFC_v2:
- Include the actual DxeBmDmaLib library code that was untentionally
  missing in the previous [RFC v2 1/6] submission.
- Minor cleanup on commit messages.

Leo Duran (6):
  MdeModulePkg: Add DxeBmDmaLib (BmDmaLib class) library
  ArmVirtPkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
  CorebootPayloadPkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
  MdeModulePkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
  OvmfPkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
  MdeModulePkg: Modify PciHostBridgeDxe to use new BmDmaLib class
    library

 ArmVirtPkg/ArmVirtQemu.dsc                         |   1 +
 ArmVirtPkg/ArmVirtQemuKernel.dsc                   |   1 +
 CorebootPayloadPkg/CorebootPayloadPkgIa32.dsc      |   1 +
 CorebootPayloadPkg/CorebootPayloadPkgIa32X64.dsc   |   1 +
 .../Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf  |   1 +
 .../Bus/Pci/PciHostBridgeDxe/PciRootBridge.h       |  13 +-
 .../Bus/Pci/PciHostBridgeDxe/PciRootBridgeIo.c     | 272 ++++------------
 MdeModulePkg/Include/Library/BmDmaLib.h            | 161 ++++++++++
 MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.c     | 351 +++++++++++++++++++++
 MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf   |  41 +++
 MdeModulePkg/MdeModulePkg.dsc                      |   3 +
 OvmfPkg/OvmfPkgIa32.dsc                            |   1 +
 OvmfPkg/OvmfPkgIa32X64.dsc                         |   1 +
 OvmfPkg/OvmfPkgX64.dsc                             |   1 +
 14 files changed, 629 insertions(+), 220 deletions(-)
 create mode 100644 MdeModulePkg/Include/Library/BmDmaLib.h
 create mode 100644 MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.c
 create mode 100644 MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf

-- 
1.9.1

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