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/** @file
OVMF ACPI Platform Driver
Copyright (c) 2008 - 2012, 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 "AcpiPlatform.h"
EFI_STATUS
EFIAPI
InstallAcpiTable (
IN EFI_ACPI_TABLE_PROTOCOL *AcpiProtocol,
IN VOID *AcpiTableBuffer,
IN UINTN AcpiTableBufferSize,
OUT UINTN *TableKey
)
{
return AcpiProtocol->InstallAcpiTable (
AcpiProtocol,
AcpiTableBuffer,
AcpiTableBufferSize,
TableKey
);
}
/**
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;
}
/**
Find ACPI tables in an FV and parses them. This function is useful for QEMU and KVM.
@param AcpiTable Protocol instance pointer
**/
EFI_STATUS
EFIAPI
FindAcpiTablesInFv (
IN EFI_ACPI_TABLE_PROTOCOL *AcpiTable
)
{
EFI_STATUS Status;
EFI_FIRMWARE_VOLUME2_PROTOCOL *FwVol;
INTN Instance;
EFI_ACPI_COMMON_HEADER *CurrentTable;
UINTN TableHandle;
UINT32 FvStatus;
UINTN TableSize;
UINTN Size;
EFI_ACPI_TABLE_INSTALL_ACPI_TABLE TableInstallFunction;
Instance = 0;
CurrentTable = NULL;
TableHandle = 0;
if (QemuDetected ()) {
TableInstallFunction = QemuInstallAcpiTable;
} else {
TableInstallFunction = InstallAcpiTable;
}
//
// 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
//
TableHandle = 0;
TableSize = ((EFI_ACPI_DESCRIPTION_HEADER *) CurrentTable)->Length;
ASSERT (Size >= TableSize);
//
// Install ACPI table
//
Status = TableInstallFunction (
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;
}
/**
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;
//
// Find the AcpiTable protocol
//
Status = gBS->LocateProtocol (
&gEfiAcpiTableProtocolGuid,
NULL,
(VOID**)&AcpiTable
);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
if (XenDetected ()) {
Status = InstallXenTables (AcpiTable);
} else {
Status = InstallQemuLinkedTables (AcpiTable);
}
if (EFI_ERROR (Status)) {
Status = FindAcpiTablesInFv (AcpiTable);
}
return Status;
}
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