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- /** @file
- Sample ACPI Platform Driver
- Copyright (c) 2008 - 2011, Intel Corporation. All rights reserved.<BR>
- This program and the accompanying materials
- are licensed and made available under the terms and conditions of the BSD License
- which accompanies this distribution. The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.php
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
- **/
- #include <PiDxe.h>
- #include <Protocol/AcpiTable.h>
- #include <Protocol/FirmwareVolume2.h>
- #include <Library/BaseLib.h>
- #include <Library/UefiBootServicesTableLib.h>
- #include <Library/DebugLib.h>
- #include <Library/PcdLib.h>
- #include <IndustryStandard/Acpi.h>
- #include "UpdateAcpiTable.h"
- /**
- Locate the first instance of a protocol. If the protocol requested is an
- FV protocol, then it will return the first FV that contains the ACPI table
- storage file.
- @param Instance Return pointer to the first instance of the protocol
- @return EFI_SUCCESS The function completed successfully.
- @return EFI_NOT_FOUND The protocol could not be located.
- @return EFI_OUT_OF_RESOURCES There are not enough resources to find the protocol.
- **/
- EFI_STATUS
- LocateFvInstanceWithTables (
- OUT EFI_FIRMWARE_VOLUME2_PROTOCOL **Instance
- )
- {
- EFI_STATUS Status;
- EFI_HANDLE *HandleBuffer;
- UINTN NumberOfHandles;
- EFI_FV_FILETYPE FileType;
- UINT32 FvStatus;
- EFI_FV_FILE_ATTRIBUTES Attributes;
- UINTN Size;
- UINTN Index;
- EFI_FIRMWARE_VOLUME2_PROTOCOL *FvInstance;
- FvStatus = 0;
- //
- // Locate protocol.
- //
- Status = gBS->LocateHandleBuffer (
- ByProtocol,
- &gEfiFirmwareVolume2ProtocolGuid,
- NULL,
- &NumberOfHandles,
- &HandleBuffer
- );
- if (EFI_ERROR (Status)) {
- //
- // Defined errors at this time are not found and out of resources.
- //
- return Status;
- }
- //
- // Looking for FV with ACPI storage file
- //
- for (Index = 0; Index < NumberOfHandles; Index++) {
- //
- // Get the protocol on this handle
- // This should not fail because of LocateHandleBuffer
- //
- Status = gBS->HandleProtocol (
- HandleBuffer[Index],
- &gEfiFirmwareVolume2ProtocolGuid,
- (VOID**) &FvInstance
- );
- ASSERT_EFI_ERROR (Status);
- //
- // See if it has the ACPI storage file
- //
- Status = FvInstance->ReadFile (
- FvInstance,
- (EFI_GUID*)PcdGetPtr (PcdAcpiTableStorageFile),
- NULL,
- &Size,
- &FileType,
- &Attributes,
- &FvStatus
- );
- //
- // If we found it, then we are done
- //
- if (Status == EFI_SUCCESS) {
- *Instance = FvInstance;
- break;
- }
- }
- //
- // Our exit status is determined by the success of the previous operations
- // If the protocol was found, Instance already points to it.
- //
- //
- // Free any allocated buffers
- //
- gBS->FreePool (HandleBuffer);
- return Status;
- }
- /**
- This function calculates and updates an UINT8 checksum.
- @param Buffer Pointer to buffer to checksum
- @param Size Number of bytes to checksum
- **/
- VOID
- AcpiPlatformChecksum (
- IN UINT8 *Buffer,
- IN UINTN Size
- )
- {
- UINTN ChecksumOffset;
- ChecksumOffset = OFFSET_OF (EFI_ACPI_DESCRIPTION_HEADER, Checksum);
- //
- // Set checksum to 0 first
- //
- Buffer[ChecksumOffset] = 0;
- //
- // Update checksum value
- //
- Buffer[ChecksumOffset] = CalculateCheckSum8(Buffer, Size);
- }
- /**
- Entrypoint of Acpi Platform driver.
- @param ImageHandle
- @param SystemTable
- @return EFI_SUCCESS
- @return EFI_LOAD_ERROR
- @return EFI_OUT_OF_RESOURCES
- **/
- EFI_STATUS
- EFIAPI
- AcpiPlatformEntryPoint (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
- {
- EFI_STATUS Status;
- EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
- EFI_FIRMWARE_VOLUME2_PROTOCOL *FwVol;
- INTN Instance;
- EFI_ACPI_COMMON_HEADER *CurrentTable;
- UINTN TableHandle;
- UINT32 FvStatus;
- UINTN TableSize;
- UINTN Size;
- EFI_STATUS TableStatus;
- EFI_ACPI_DESCRIPTION_HEADER *TableHeader;
- Instance = 0;
- CurrentTable = NULL;
- TableHandle = 0;
- //
- // Find the AcpiTable protocol
- //
- Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID**)&AcpiTable);
- if (EFI_ERROR (Status)) {
- return EFI_ABORTED;
- }
- //
- // Locate the firmware volume protocol
- //
- Status = LocateFvInstanceWithTables (&FwVol);
- if (EFI_ERROR (Status)) {
- return EFI_ABORTED;
- }
- //
- // Read tables from the storage file.
- //
- while (Status == EFI_SUCCESS) {
- Status = FwVol->ReadSection (
- FwVol,
- (EFI_GUID*)PcdGetPtr (PcdAcpiTableStorageFile),
- EFI_SECTION_RAW,
- Instance,
- (VOID**) &CurrentTable,
- &Size,
- &FvStatus
- );
- if (!EFI_ERROR(Status)) {
- //
- // Add the table
- //
- TableHeader = (EFI_ACPI_DESCRIPTION_HEADER*) (CurrentTable);
- //Update specfic Acpi Table
- //If the Table is updated failed, doesn't install it,
- //go to find next section.
- TableStatus = UpdateAcpiTable(TableHeader);
- if (TableStatus == EFI_SUCCESS) {
- TableHandle = 0;
- TableSize = ((EFI_ACPI_DESCRIPTION_HEADER *) CurrentTable)->Length;
- ASSERT (Size >= TableSize);
- //
- // Checksum ACPI table
- //
- AcpiPlatformChecksum ((UINT8*)CurrentTable, TableSize);
- //
- // Install ACPI table
- //
- Status = AcpiTable->InstallAcpiTable (
- AcpiTable,
- CurrentTable,
- TableSize,
- &TableHandle
- );
- }
- //
- // Free memory allocated by ReadSection
- //
- gBS->FreePool (CurrentTable);
- if (EFI_ERROR(Status)) {
- return EFI_ABORTED;
- }
- //
- // Increment the instance
- //
- Instance++;
- CurrentTable = NULL;
- }
- }
- return EFI_SUCCESS;
- }
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