/** @file
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File to contain all the hardware specific stuff for the Smm Sw dispatch protocol.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "PchSmmHelpers.h"
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#include <Protocol/SmmCpu.h>
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//
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// There is only one instance for SwCommBuffer.
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// It's safe in SMM since there is no re-entry for the function.
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//
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_SMM_SW_CONTEXT mPchSwCommBuffer;
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_SMM_CPU_PROTOCOL *mSmmCpuProtocol;
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GLOBAL_REMOVE_IF_UNREFERENCED CONST PCH_SMM_SOURCE_DESC SW_SOURCE_DESC = {
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PCH_SMM_NO_FLAGS,
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{
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{
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{
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ACPI_ADDR_TYPE,
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{R_PCH_SMI_EN}
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},
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S_PCH_SMI_EN,
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N_PCH_SMI_EN_APMC
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},
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NULL_BIT_DESC_INITIALIZER
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},
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{
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{
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{
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ACPI_ADDR_TYPE,
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{R_PCH_SMI_STS}
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},
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S_PCH_SMI_STS,
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N_PCH_SMI_STS_APM
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}
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},
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{
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{
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ACPI_ADDR_TYPE,
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{R_PCH_SMI_STS}
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},
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S_PCH_SMI_STS,
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N_PCH_SMI_STS_APM
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}
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};
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/**
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Get the Software Smi value
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@param[in] Record No use
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@param[out] Context The context that includes Software Smi value to be filled
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**/
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VOID
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EFIAPI
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SwGetContext (
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IN DATABASE_RECORD *Record,
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OUT PCH_SMM_CONTEXT *Context
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)
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{
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UINT8 ApmCnt;
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ApmCnt = IoRead8 ((UINTN) R_PCH_APM_CNT);
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Context->Sw.SwSmiInputValue = ApmCnt;
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}
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/**
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Check whether software SMI value of two contexts match
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@param[in] Context1 Context 1 that includes software SMI value 1
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@param[in] Context2 Context 2 that includes software SMI value 2
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@retval FALSE Software SMI value match
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@retval TRUE Software SMI value don't match
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**/
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BOOLEAN
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EFIAPI
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SwCmpContext (
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IN PCH_SMM_CONTEXT *Context1,
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IN PCH_SMM_CONTEXT *Context2
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)
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{
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return (BOOLEAN) (Context1->Sw.SwSmiInputValue == Context2->Sw.SwSmiInputValue);
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}
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/**
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Gather the CommBuffer information of SmmSwDispatch2.
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@param[in] Record No use
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@param[out] CommBuffer Point to the CommBuffer structure
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@param[out] CommBufferSize Point to the Size of CommBuffer structure
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**/
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VOID
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EFIAPI
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SwGetCommBuffer (
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IN DATABASE_RECORD *Record,
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OUT VOID **CommBuffer,
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OUT UINTN *CommBufferSize
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)
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{
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EFI_STATUS Status;
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EFI_SMM_SAVE_STATE_IO_INFO SmiIoInfo;
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UINTN Index;
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ASSERT (Record->ProtocolType == SwType);
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mPchSwCommBuffer.CommandPort = IoRead8 (R_PCH_APM_CNT);
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mPchSwCommBuffer.DataPort = IoRead8 (R_PCH_APM_STS);
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//
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// Try to find which CPU trigger SWSMI
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//
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mPchSwCommBuffer.SwSmiCpuIndex = 0;
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for (Index = 0; Index < gSmst->NumberOfCpus; Index++) {
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Status = mSmmCpuProtocol->ReadSaveState (
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mSmmCpuProtocol,
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sizeof (EFI_SMM_SAVE_STATE_IO_INFO),
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EFI_SMM_SAVE_STATE_REGISTER_IO,
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Index,
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&SmiIoInfo
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);
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if (EFI_ERROR (Status)) {
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continue;
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}
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if (SmiIoInfo.IoPort == R_PCH_APM_CNT) {
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//
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// Find matched CPU.
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//
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mPchSwCommBuffer.SwSmiCpuIndex = Index;
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break;
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}
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}
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///
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/// Return the CommBuffer
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///
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*CommBuffer = (VOID *) &mPchSwCommBuffer;
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*CommBufferSize = sizeof (EFI_SMM_SW_CONTEXT);
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}
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/**
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Init required protocol for Pch Sw Dispatch protocol.
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**/
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VOID
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PchSwDispatchInit (
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VOID
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)
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{
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EFI_STATUS Status;
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//
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// Locate PI SMM CPU protocol
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//
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Status = gSmst->SmmLocateProtocol (&gEfiSmmCpuProtocolGuid, NULL, (VOID **)&mSmmCpuProtocol);
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ASSERT_EFI_ERROR (Status);
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}
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