127 lines
4.7 KiB
C
127 lines
4.7 KiB
C
/** @file
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PCH DMI/PSTH SMI handler implementation.
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@copyright
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INTEL CONFIDENTIAL
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Copyright 2021 Intel Corporation.
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The source code contained or described herein and all documents related to the
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source code ("Material") are owned by Intel Corporation or its suppliers or
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licensors. Title to the Material remains with Intel Corporation or its suppliers
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and licensors. The Material may contain trade secrets and proprietary and
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confidential information of Intel Corporation and its suppliers and licensors,
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and is protected by worldwide copyright and trade secret laws and treaty
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provisions. No part of the Material may be used, copied, reproduced, modified,
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published, uploaded, posted, transmitted, distributed, or disclosed in any way
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without Intel's prior express written permission.
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No license under any patent, copyright, trade secret or other intellectual
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property right is granted to or conferred upon you by disclosure or delivery
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of the Materials, either expressly, by implication, inducement, estoppel or
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otherwise. Any license under such intellectual property rights must be
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express and approved by Intel in writing.
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Unless otherwise agreed by Intel in writing, you may not remove or alter
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this notice or any other notice embedded in Materials by Intel or
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Intel's suppliers or licensors in any way.
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This file contains an 'Intel Peripheral Driver' and is uniquely identified as
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"Intel Reference Module" and is licensed for Intel CPUs and chipsets under
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the terms of your license agreement with Intel or your vendor. This file may
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be modified by the user, subject to additional terms of the license agreement.
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@par Specification
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**/
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#include "PchInitSmm.h"
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#include <Register/PchDmiRegs.h>
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#include <Register/PchRegsPsth.h>
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#include <Register/PchPcrRegs.h>
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/**
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A SW SMI callback to copy the data in the PSTH TRPREG0-3 registers to the DMI IOT-4 registers
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@param[in] DispatchHandle - The handle of this callback, obtained when registering
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@param[in] CallbackContext - Pointer to the EFI_SMM_IO_TRAP_DISPATCH_CALLBACK_CONTEXT
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@param[in/out] ComBuffer - Unused
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@param[in/out] ComBuferSize - Unused
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**/
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VOID
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EFIAPI
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PchSmiDmiPsthCallBack (
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IN EFI_HANDLE DispatchHandle,
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IN EFI_SMM_IO_TRAP_CONTEXT *CallbackContext,
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IN OUT VOID *CommBuffer,
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IN OUT UINTN *CommBufferSize
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)
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{
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UINT8 TrapHandlerNumber;
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//
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// Mirror the values of the PSTH TREG[0-3] high and low registers into the cooresponding DMI IOT[1-4] registers
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//
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for (TrapHandlerNumber = 0; TrapHandlerNumber < 4; TrapHandlerNumber++) {
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PchPcrWrite32 (PID_DMI, R_PCH_DMI_PCR_IOT1 + TrapHandlerNumber * 8, PchPcrRead32 (PID_PSTH, R_PSTH_PCR_TRPREG0 + TrapHandlerNumber * 8));
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PchPcrWrite32 (PID_DMI, R_PCH_DMI_PCR_IOT1 + TrapHandlerNumber * 8 + 4, PchPcrRead32 (PID_PSTH, R_PSTH_PCR_TRPREG0 + TrapHandlerNumber * 8 + 4));
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}
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}
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/**
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This registers a SW SMI that copies the IoTrap registers to their cooresponding DMI mirror registers
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@param[in] ImageHandle Used to initialize protocol
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@retval EFI_SUCCESS SMI DMI PSTH Handler is registered successfully.
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@retval EFI_UNSUPPORTED Unable to register SMI DMI PSTH Handler successfully.
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**/
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EFI_STATUS
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EFIAPI
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PchSmiDmiPsthRegister (
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IN EFI_HANDLE ImageHandle
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)
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{
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EFI_STATUS Status;
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EFI_HANDLE SwHandle;
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EFI_SMM_SW_REGISTER_CONTEXT SwContext;
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EFI_SMM_SW_DISPATCH2_PROTOCOL *SwDispatch;
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PCH_SMI_DMI_PSTH_PROTOCOL *PchSmiDmiPsthProtocol;
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//
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// Locate the SMM SW dispatch protocol
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//
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if (gSmst != NULL) {
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Status = gSmst->SmmLocateProtocol (&gEfiSmmSwDispatch2ProtocolGuid, NULL, (VOID**)&SwDispatch);
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ASSERT_EFI_ERROR (Status);
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} else {
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return EFI_UNSUPPORTED;
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}
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SwContext.SwSmiInputValue = (UINTN) -1;
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//
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// Set up the SW SMI callback
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//
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Status = SwDispatch->Register (SwDispatch,
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(EFI_SMM_HANDLER_ENTRY_POINT2) PchSmiDmiPsthCallBack,
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&SwContext,
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&SwHandle);
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ASSERT_EFI_ERROR (Status);
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//
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// Set up PchSmiDmiPsthProtocol so the S3 Bootscript has access to the SwSwiInputValue
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//
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(gBS->AllocatePool) (EfiBootServicesData, sizeof (PCH_SMI_DMI_PSTH_PROTOCOL), (VOID **)&PchSmiDmiPsthProtocol);
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if (PchSmiDmiPsthProtocol == NULL) {
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return EFI_UNSUPPORTED;
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}
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PchSmiDmiPsthProtocol->PchSmiDmiPsthAddress = (UINT16) SwContext.SwSmiInputValue;
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return gBS->InstallMultipleProtocolInterfaces (
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&ImageHandle,
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&gPchSmiDmiPsthProtocolGuid,
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PchSmiDmiPsthProtocol,
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NULL
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);
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}
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