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/** @file
Min DSDT Driver
Copyright (c) 2018, 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 that 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 <Base.h>
#include <Uefi.h>
#include <IndustryStandard/Acpi.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/PciLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Protocol/FirmwareVolume2.h>
#include <Protocol/AcpiTable.h>
//
// Function implementations
//
/**
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[in] Protocol The protocol to find.
@param[in] FfsGuid The FFS that contains the ACPI table.
@param[out] Instance Return pointer to the first instance of the protocol.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The protocol could not be located.
@retval EFI_OUT_OF_RESOURCES There are not enough resources to find the protocol.
**/
EFI_STATUS
LocateSupportProtocol (
IN EFI_GUID *Protocol,
IN EFI_GUID *FfsGuid,
OUT VOID **Instance
)
{
EFI_STATUS Status;
EFI_HANDLE *HandleBuffer;
UINTN NumberOfHandles;
EFI_FV_FILETYPE FileType;
UINT32 FvStatus;
EFI_FV_FILE_ATTRIBUTES Attributes;
UINTN Size;
UINTN Index;
//
// Locate protocol.
//
Status = gBS->LocateHandleBuffer (
ByProtocol,
Protocol,
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],
Protocol,
Instance
);
ASSERT_EFI_ERROR (Status);
//
// See if it has the ACPI storage file
//
Size = 0;
FvStatus = 0;
Status = ((EFI_FIRMWARE_VOLUME2_PROTOCOL *) (*Instance))->ReadFile (
*Instance,
FfsGuid,
NULL,
&Size,
&FileType,
&Attributes,
&FvStatus
);
//
// If we found it, then we are done
//
if (Status == EFI_SUCCESS) {
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
//
FreePool (HandleBuffer);
return Status;
}
/**
Publish ACPI table from FV.
@param[in] FfsGuid The FFS that contains the ACPI table.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
PublishAcpiTablesFromFv (
IN EFI_GUID *FfsGuid
)
{
EFI_STATUS Status;
EFI_FIRMWARE_VOLUME2_PROTOCOL *FwVol;
EFI_ACPI_COMMON_HEADER *CurrentTable;
UINT32 FvStatus;
UINTN Size;
UINTN TableHandle;
INTN Instance;
EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
Instance = 0;
TableHandle = 0;
CurrentTable = NULL;
FwVol = NULL;
Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **)&AcpiTable);
ASSERT_EFI_ERROR (Status);
//
// Locate the firmware volume protocol
//
Status = LocateSupportProtocol (
&gEfiFirmwareVolume2ProtocolGuid,
FfsGuid,
(VOID **) &FwVol
);
ASSERT_EFI_ERROR (Status);
//
// Read tables from the storage file.
//
while (Status == EFI_SUCCESS) {
Status = FwVol->ReadSection (
FwVol,
FfsGuid,
EFI_SECTION_RAW,
Instance,
(VOID **) &CurrentTable,
&Size,
&FvStatus
);
if (!EFI_ERROR (Status)) {
//
// Add the table
//
TableHandle = 0;
Status = AcpiTable->InstallAcpiTable (
AcpiTable,
CurrentTable,
CurrentTable->Length,
&TableHandle
);
ASSERT_EFI_ERROR (Status);
//
// Increment the instance
//
Instance++;
CurrentTable = NULL;
}
}
//
// Finished
//
return EFI_SUCCESS;
}
/**
ACPI Platform driver installation function.
@param[in] ImageHandle Handle for this drivers loaded image protocol.
@param[in] SystemTable EFI system table.
@retval EFI_SUCCESS The driver installed without error.
@retval EFI_ABORTED The driver encountered an error and could not complete installation of
the ACPI tables.
**/
EFI_STATUS
EFIAPI
InstallMinDsdt (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = PublishAcpiTablesFromFv (&gEfiCallerIdGuid);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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