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/** @file
This file contains a sample implementation of the Platform Runtime Mechanism (PRM)
SSDT Install library.
Copyright (c) Microsoft Corporation
Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <IndustryStandard/Acpi.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DxeServicesLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/AcpiTable.h>
#define _DBGMSGID_ "[PRMSSDTINSTALL]"
/**
Installs the PRM SSDT.
@param[in] OemId OEM ID to be used in the SSDT installation.
@retval EFI_SUCCESS The PRM SSDT was installed successfully.
@retval EFI_INVALID_PARAMETER The OemId pointer argument is NULL.
@retval EFI_NOT_FOUND An instance of gEfiAcpiTableProtocolGuid was not found installed or
the SSDT (AML RAW section) could not be found in the current FV.
@retval EFI_OUT_OF_RESOURCES Insufficient memory resources to install the PRM SSDT.
**/
EFI_STATUS
InstallPrmSsdt (
IN CONST UINT8 *OemId
)
{
EFI_STATUS Status;
UINTN SsdtSize;
UINTN TableKey;
EFI_ACPI_TABLE_PROTOCOL *AcpiTableProtocol;
EFI_ACPI_DESCRIPTION_HEADER *Ssdt;
DEBUG ((DEBUG_INFO, "%a %a - Entry.\n", _DBGMSGID_, __func__));
if (OemId == NULL) {
return EFI_INVALID_PARAMETER;
}
Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **)&AcpiTableProtocol);
if (!EFI_ERROR (Status)) {
//
// Discover the SSDT
//
Status = GetSectionFromFv (
&gEfiCallerIdGuid,
EFI_SECTION_RAW,
0,
(VOID **)&Ssdt,
&SsdtSize
);
ASSERT_EFI_ERROR (Status);
DEBUG ((DEBUG_INFO, "%a %a: SSDT loaded...\n", _DBGMSGID_, __func__));
//
// Update OEM ID in the SSDT
//
CopyMem (&Ssdt->OemId, OemId, sizeof (Ssdt->OemId));
//
// Publish the SSDT. Table is re-checksummed.
//
TableKey = 0;
Status = AcpiTableProtocol->InstallAcpiTable (
AcpiTableProtocol,
Ssdt,
SsdtSize,
&TableKey
);
ASSERT_EFI_ERROR (Status);
}
return Status;
}
/**
The entry point for this module.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval Others An error occurred when executing this entry point.
**/
EFI_STATUS
EFIAPI
PrmSsdtInstallEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = InstallPrmSsdt ((UINT8 *)PcdGetPtr (PcdAcpiDefaultOemId));
ASSERT_EFI_ERROR (Status);
return Status;
}
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