1 files changed, 92 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/SmmCommunicationBufferDxe/SmmCommunicationBufferDxe.c b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/SmmCommunicationBufferDxe/SmmCommunicationBufferDxe.c
new file mode 100644
index 00000000..a4187a38
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/SmmCommunicationBufferDxe/SmmCommunicationBufferDxe.c
@@ -0,0 +1,92 @@
+/** @file
+A driver allocates common SMM communication buffer in EfiReservedMemoryType.
+
+This driver allocates common SMM communication buffer in EfiReservedMemoryType,
+then it publishes the information to EFI configuration table with
+gEdkiiPiSmmCommunicationRegionTableGuid.
+Any other driver or application can get the table and know the common
+communication buffer.
+
+Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiLib.h>
+#include <Guid/PiSmmCommunicationRegionTable.h>
+
+#define DEFAULT_COMMON_PI_SMM_COMMUNIATION_REGION_PAGES  4
+
+/**
+  Entry Point for SMM communication buffer driver.
+
+  @param[in] ImageHandle  Image handle of this driver.
+  @param[in] SystemTable  A Pointer to the EFI System Table.
+
+  @retval EFI_SUCEESS
+  @return Others          Some error occurs.
+**/
+EFI_STATUS
+EFIAPI
+SmmCommunicationBufferEntryPoint (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS                               Status;
+  UINT32                                   DescriptorSize;
+  EDKII_PI_SMM_COMMUNICATION_REGION_TABLE  *PiSmmCommunicationRegionTable;
+  EFI_MEMORY_DESCRIPTOR                    *Entry;
+
+  DescriptorSize = sizeof(EFI_MEMORY_DESCRIPTOR);
+  //
+  // Make sure Size != sizeof(EFI_MEMORY_DESCRIPTOR). This will
+  // prevent people from having pointer math bugs in their code.
+  // now you have to use *DescriptorSize to make things work.
+  //
+  DescriptorSize += sizeof(UINT64) - (DescriptorSize % sizeof (UINT64));
+
+  //
+  // Allocate and fill PiSmmCommunicationRegionTable
+  //
+  PiSmmCommunicationRegionTable = AllocateReservedPool (sizeof(EDKII_PI_SMM_COMMUNICATION_REGION_TABLE) + DescriptorSize);
+  ASSERT(PiSmmCommunicationRegionTable != NULL);
+  ZeroMem (PiSmmCommunicationRegionTable, sizeof(EDKII_PI_SMM_COMMUNICATION_REGION_TABLE) + DescriptorSize);
+
+  PiSmmCommunicationRegionTable->Version         = EDKII_PI_SMM_COMMUNICATION_REGION_TABLE_VERSION;
+  PiSmmCommunicationRegionTable->NumberOfEntries = 1;
+  PiSmmCommunicationRegionTable->DescriptorSize  = DescriptorSize;
+  Entry = (EFI_MEMORY_DESCRIPTOR *)(PiSmmCommunicationRegionTable + 1);
+  Entry->Type          = EfiConventionalMemory;
+  Entry->PhysicalStart = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateReservedPages (DEFAULT_COMMON_PI_SMM_COMMUNIATION_REGION_PAGES);
+  ASSERT(Entry->PhysicalStart != 0);
+  Entry->VirtualStart  = 0;
+  Entry->NumberOfPages = DEFAULT_COMMON_PI_SMM_COMMUNIATION_REGION_PAGES;
+  Entry->Attribute     = 0;
+
+  DEBUG ((EFI_D_INFO, "PiSmmCommunicationRegionTable:(0x%x)\n", PiSmmCommunicationRegionTable));
+  DEBUG ((EFI_D_INFO, "  Version         - 0x%x\n", PiSmmCommunicationRegionTable->Version));
+  DEBUG ((EFI_D_INFO, "  NumberOfEntries - 0x%x\n", PiSmmCommunicationRegionTable->NumberOfEntries));
+  DEBUG ((EFI_D_INFO, "  DescriptorSize  - 0x%x\n", PiSmmCommunicationRegionTable->DescriptorSize));
+  DEBUG ((EFI_D_INFO, "Entry:(0x%x)\n", Entry));
+  DEBUG ((EFI_D_INFO, "  Type            - 0x%x\n", Entry->Type));
+  DEBUG ((EFI_D_INFO, "  PhysicalStart   - 0x%lx\n", Entry->PhysicalStart));
+  DEBUG ((EFI_D_INFO, "  VirtualStart    - 0x%lx\n", Entry->VirtualStart));
+  DEBUG ((EFI_D_INFO, "  NumberOfPages   - 0x%lx\n", Entry->NumberOfPages));
+  DEBUG ((EFI_D_INFO, "  Attribute       - 0x%lx\n", Entry->Attribute));
+
+  //
+  // Publish this table, so that other driver can use the buffer.
+  //
+  Status = gBS->InstallConfigurationTable (&gEdkiiPiSmmCommunicationRegionTableGuid, PiSmmCommunicationRegionTable);
+  ASSERT_EFI_ERROR (Status);
+
+  return Status;
+}