/** @file
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Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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Module Name:
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ExI.c
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Abstract:
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ExI configuration based on setup option
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--*/
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#include "PlatformDxe.h"
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#define PchLpcPciCfg32(Register) MmioRead32 (MmPciAddress (0, DEFAULT_PCI_BUS_NUMBER_PCH, PCI_DEVICE_NUMBER_PCH_LPC, 0, Register))
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//
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// Procedure: GetPmcBase
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//
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// Description: This function read content of B:D:F 0:31:0, offset 44h (for
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// PmcBase)
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//
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// Input: None
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//
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// Output: 32 bit PmcBase
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//
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UINT32
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GetPmcBase (
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VOID
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)
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{
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return (PchLpcPciCfg32 (R_PCH_LPC_PMC_BASE) & B_PCH_LPC_PMC_BASE_BAR);
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}
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/**
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Configure ExI.
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@param ImageHandle Pointer to the loaded image protocol for this driver
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@param SystemTable Pointer to the EFI System Table
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@retval EFI_SUCCESS The driver initializes correctly.
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**/
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VOID
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InitExI (
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)
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{
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EFI_STATUS Status;
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SYSTEM_CONFIGURATION SystemConfiguration;
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UINTN VarSize;
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VarSize = sizeof(SYSTEM_CONFIGURATION);
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Status = gRT->GetVariable(
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L"Setup",
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&gEfiNormalSetupGuid,
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NULL,
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&VarSize,
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&SystemConfiguration
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);
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if (EFI_ERROR (Status) || VarSize != sizeof(SYSTEM_CONFIGURATION)) {
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//The setup variable is corrupted
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VarSize = sizeof(SYSTEM_CONFIGURATION);
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Status = gRT->GetVariable(
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L"SetupRecovery",
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&gEfiNormalSetupGuid,
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NULL,
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&VarSize,
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&SystemConfiguration
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);
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ASSERT_EFI_ERROR (Status);
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}
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if (SystemConfiguration.ExISupport == 1) {
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MmioOr32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), (UINT32) BIT0+BIT1+BIT2);
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} else if (SystemConfiguration.ExISupport == 0) {
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MmioAnd32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), ~((UINT32) BIT0+BIT1+BIT2)); //clear bit 0,1,2
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}
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}
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