mirror of https://github.com/acidanthera/audk.git
100 lines
4.2 KiB
C
100 lines
4.2 KiB
C
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/** @file
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A driver allocates common SMM communication buffer in EfiReservedMemoryType.
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This driver allocates common SMM communication buffer in EfiReservedMemoryType,
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then it publishes the information to EFI configuration table with
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gEdkiiPiSmmCommunicationRegionTableGuid.
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Any other driver or application can get the table and know the common
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communication buffer.
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Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiDxe.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiLib.h>
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#include <Library/PcdLib.h>
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#include <Guid/PiSmmCommunicationRegionTable.h>
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#define DEFAULT_COMMON_PI_SMM_COMMUNIATION_REGION_PAGES 4
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/**
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Entry Point for SMM communication buffer driver.
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@param[in] ImageHandle Image handle of this driver.
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@param[in] SystemTable A Pointer to the EFI System Table.
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@retval EFI_SUCEESS
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@return Others Some error occurs.
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**/
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EFI_STATUS
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EFIAPI
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SmmCommunicationBufferEntryPoint (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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UINT32 DescriptorSize;
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EDKII_PI_SMM_COMMUNICATION_REGION_TABLE *PiSmmCommunicationRegionTable;
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EFI_MEMORY_DESCRIPTOR *Entry;
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DescriptorSize = sizeof(EFI_MEMORY_DESCRIPTOR);
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//
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// Make sure Size != sizeof(EFI_MEMORY_DESCRIPTOR). This will
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// prevent people from having pointer math bugs in their code.
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// now you have to use *DescriptorSize to make things work.
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//
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DescriptorSize += sizeof(UINT64) - (DescriptorSize % sizeof (UINT64));
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//
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// Allocate and fill PiSmmCommunicationRegionTable
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//
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PiSmmCommunicationRegionTable = AllocateReservedPool (sizeof(EDKII_PI_SMM_COMMUNICATION_REGION_TABLE) + DescriptorSize);
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ASSERT(PiSmmCommunicationRegionTable != NULL);
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ZeroMem (PiSmmCommunicationRegionTable, sizeof(EDKII_PI_SMM_COMMUNICATION_REGION_TABLE) + DescriptorSize);
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PiSmmCommunicationRegionTable->Version = EDKII_PI_SMM_COMMUNICATION_REGION_TABLE_VERSION;
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PiSmmCommunicationRegionTable->NumberOfEntries = 1;
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PiSmmCommunicationRegionTable->DescriptorSize = DescriptorSize;
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Entry = (EFI_MEMORY_DESCRIPTOR *)(PiSmmCommunicationRegionTable + 1);
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Entry->Type = EfiConventionalMemory;
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Entry->PhysicalStart = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateReservedPages (DEFAULT_COMMON_PI_SMM_COMMUNIATION_REGION_PAGES);
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ASSERT(Entry->PhysicalStart != 0);
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Entry->VirtualStart = 0;
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Entry->NumberOfPages = DEFAULT_COMMON_PI_SMM_COMMUNIATION_REGION_PAGES;
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Entry->Attribute = 0;
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DEBUG ((EFI_D_INFO, "PiSmmCommunicationRegionTable:(0x%x)\n", PiSmmCommunicationRegionTable));
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DEBUG ((EFI_D_INFO, " Version - 0x%x\n", PiSmmCommunicationRegionTable->Version));
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DEBUG ((EFI_D_INFO, " NumberOfEntries - 0x%x\n", PiSmmCommunicationRegionTable->NumberOfEntries));
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DEBUG ((EFI_D_INFO, " DescriptorSize - 0x%x\n", PiSmmCommunicationRegionTable->DescriptorSize));
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DEBUG ((EFI_D_INFO, "Entry:(0x%x)\n", Entry));
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DEBUG ((EFI_D_INFO, " Type - 0x%x\n", Entry->Type));
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DEBUG ((EFI_D_INFO, " PhysicalStart - 0x%lx\n", Entry->PhysicalStart));
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DEBUG ((EFI_D_INFO, " VirtualStart - 0x%lx\n", Entry->VirtualStart));
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DEBUG ((EFI_D_INFO, " NumberOfPages - 0x%lx\n", Entry->NumberOfPages));
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DEBUG ((EFI_D_INFO, " Attribute - 0x%lx\n", Entry->Attribute));
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//
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// Publish this table, so that other driver can use the buffer.
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//
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Status = gBS->InstallConfigurationTable (&gEdkiiPiSmmCommunicationRegionTableGuid, PiSmmCommunicationRegionTable);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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